net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)
[sfrench/cifs-2.6.git] / drivers / net / ethernet / amazon / ena / ena_netdev.c
1 /*
2  * Copyright 2015 Amazon.com, Inc. or its affiliates.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  */
32
33 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
34
35 #ifdef CONFIG_RFS_ACCEL
36 #include <linux/cpu_rmap.h>
37 #endif /* CONFIG_RFS_ACCEL */
38 #include <linux/ethtool.h>
39 #include <linux/if_vlan.h>
40 #include <linux/kernel.h>
41 #include <linux/module.h>
42 #include <linux/moduleparam.h>
43 #include <linux/numa.h>
44 #include <linux/pci.h>
45 #include <linux/utsname.h>
46 #include <linux/version.h>
47 #include <linux/vmalloc.h>
48 #include <net/ip.h>
49
50 #include "ena_netdev.h"
51 #include "ena_pci_id_tbl.h"
52
53 static char version[] = DEVICE_NAME " v" DRV_MODULE_VERSION "\n";
54
55 MODULE_AUTHOR("Amazon.com, Inc. or its affiliates");
56 MODULE_DESCRIPTION(DEVICE_NAME);
57 MODULE_LICENSE("GPL");
58 MODULE_VERSION(DRV_MODULE_VERSION);
59
60 /* Time in jiffies before concluding the transmitter is hung. */
61 #define TX_TIMEOUT  (5 * HZ)
62
63 #define ENA_NAPI_BUDGET 64
64
65 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_IFUP | \
66                 NETIF_MSG_TX_DONE | NETIF_MSG_TX_ERR | NETIF_MSG_RX_ERR)
67 static int debug = -1;
68 module_param(debug, int, 0);
69 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
70
71 static struct ena_aenq_handlers aenq_handlers;
72
73 static struct workqueue_struct *ena_wq;
74
75 MODULE_DEVICE_TABLE(pci, ena_pci_tbl);
76
77 static int ena_rss_init_default(struct ena_adapter *adapter);
78
79 static void ena_tx_timeout(struct net_device *dev)
80 {
81         struct ena_adapter *adapter = netdev_priv(dev);
82
83         u64_stats_update_begin(&adapter->syncp);
84         adapter->dev_stats.tx_timeout++;
85         u64_stats_update_end(&adapter->syncp);
86
87         netif_err(adapter, tx_err, dev, "Transmit time out\n");
88
89         /* Change the state of the device to trigger reset */
90         set_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags);
91 }
92
93 static void update_rx_ring_mtu(struct ena_adapter *adapter, int mtu)
94 {
95         int i;
96
97         for (i = 0; i < adapter->num_queues; i++)
98                 adapter->rx_ring[i].mtu = mtu;
99 }
100
101 static int ena_change_mtu(struct net_device *dev, int new_mtu)
102 {
103         struct ena_adapter *adapter = netdev_priv(dev);
104         int ret;
105
106         if ((new_mtu > adapter->max_mtu) || (new_mtu < ENA_MIN_MTU)) {
107                 netif_err(adapter, drv, dev,
108                           "Invalid MTU setting. new_mtu: %d\n", new_mtu);
109
110                 return -EINVAL;
111         }
112
113         ret = ena_com_set_dev_mtu(adapter->ena_dev, new_mtu);
114         if (!ret) {
115                 netif_dbg(adapter, drv, dev, "set MTU to %d\n", new_mtu);
116                 update_rx_ring_mtu(adapter, new_mtu);
117                 dev->mtu = new_mtu;
118         } else {
119                 netif_err(adapter, drv, dev, "Failed to set MTU to %d\n",
120                           new_mtu);
121         }
122
123         return ret;
124 }
125
126 static int ena_init_rx_cpu_rmap(struct ena_adapter *adapter)
127 {
128 #ifdef CONFIG_RFS_ACCEL
129         u32 i;
130         int rc;
131
132         adapter->netdev->rx_cpu_rmap = alloc_irq_cpu_rmap(adapter->num_queues);
133         if (!adapter->netdev->rx_cpu_rmap)
134                 return -ENOMEM;
135         for (i = 0; i < adapter->num_queues; i++) {
136                 int irq_idx = ENA_IO_IRQ_IDX(i);
137
138                 rc = irq_cpu_rmap_add(adapter->netdev->rx_cpu_rmap,
139                                       adapter->msix_entries[irq_idx].vector);
140                 if (rc) {
141                         free_irq_cpu_rmap(adapter->netdev->rx_cpu_rmap);
142                         adapter->netdev->rx_cpu_rmap = NULL;
143                         return rc;
144                 }
145         }
146 #endif /* CONFIG_RFS_ACCEL */
147         return 0;
148 }
149
150 static void ena_init_io_rings_common(struct ena_adapter *adapter,
151                                      struct ena_ring *ring, u16 qid)
152 {
153         ring->qid = qid;
154         ring->pdev = adapter->pdev;
155         ring->dev = &adapter->pdev->dev;
156         ring->netdev = adapter->netdev;
157         ring->napi = &adapter->ena_napi[qid].napi;
158         ring->adapter = adapter;
159         ring->ena_dev = adapter->ena_dev;
160         ring->per_napi_packets = 0;
161         ring->per_napi_bytes = 0;
162         ring->cpu = 0;
163         u64_stats_init(&ring->syncp);
164 }
165
166 static void ena_init_io_rings(struct ena_adapter *adapter)
167 {
168         struct ena_com_dev *ena_dev;
169         struct ena_ring *txr, *rxr;
170         int i;
171
172         ena_dev = adapter->ena_dev;
173
174         for (i = 0; i < adapter->num_queues; i++) {
175                 txr = &adapter->tx_ring[i];
176                 rxr = &adapter->rx_ring[i];
177
178                 /* TX/RX common ring state */
179                 ena_init_io_rings_common(adapter, txr, i);
180                 ena_init_io_rings_common(adapter, rxr, i);
181
182                 /* TX specific ring state */
183                 txr->ring_size = adapter->tx_ring_size;
184                 txr->tx_max_header_size = ena_dev->tx_max_header_size;
185                 txr->tx_mem_queue_type = ena_dev->tx_mem_queue_type;
186                 txr->sgl_size = adapter->max_tx_sgl_size;
187                 txr->smoothed_interval =
188                         ena_com_get_nonadaptive_moderation_interval_tx(ena_dev);
189
190                 /* RX specific ring state */
191                 rxr->ring_size = adapter->rx_ring_size;
192                 rxr->rx_copybreak = adapter->rx_copybreak;
193                 rxr->sgl_size = adapter->max_rx_sgl_size;
194                 rxr->smoothed_interval =
195                         ena_com_get_nonadaptive_moderation_interval_rx(ena_dev);
196         }
197 }
198
199 /* ena_setup_tx_resources - allocate I/O Tx resources (Descriptors)
200  * @adapter: network interface device structure
201  * @qid: queue index
202  *
203  * Return 0 on success, negative on failure
204  */
205 static int ena_setup_tx_resources(struct ena_adapter *adapter, int qid)
206 {
207         struct ena_ring *tx_ring = &adapter->tx_ring[qid];
208         struct ena_irq *ena_irq = &adapter->irq_tbl[ENA_IO_IRQ_IDX(qid)];
209         int size, i, node;
210
211         if (tx_ring->tx_buffer_info) {
212                 netif_err(adapter, ifup,
213                           adapter->netdev, "tx_buffer_info info is not NULL");
214                 return -EEXIST;
215         }
216
217         size = sizeof(struct ena_tx_buffer) * tx_ring->ring_size;
218         node = cpu_to_node(ena_irq->cpu);
219
220         tx_ring->tx_buffer_info = vzalloc_node(size, node);
221         if (!tx_ring->tx_buffer_info) {
222                 tx_ring->tx_buffer_info = vzalloc(size);
223                 if (!tx_ring->tx_buffer_info)
224                         return -ENOMEM;
225         }
226
227         size = sizeof(u16) * tx_ring->ring_size;
228         tx_ring->free_tx_ids = vzalloc_node(size, node);
229         if (!tx_ring->free_tx_ids) {
230                 tx_ring->free_tx_ids = vzalloc(size);
231                 if (!tx_ring->free_tx_ids) {
232                         vfree(tx_ring->tx_buffer_info);
233                         return -ENOMEM;
234                 }
235         }
236
237         /* Req id ring for TX out of order completions */
238         for (i = 0; i < tx_ring->ring_size; i++)
239                 tx_ring->free_tx_ids[i] = i;
240
241         /* Reset tx statistics */
242         memset(&tx_ring->tx_stats, 0x0, sizeof(tx_ring->tx_stats));
243
244         tx_ring->next_to_use = 0;
245         tx_ring->next_to_clean = 0;
246         tx_ring->cpu = ena_irq->cpu;
247         return 0;
248 }
249
250 /* ena_free_tx_resources - Free I/O Tx Resources per Queue
251  * @adapter: network interface device structure
252  * @qid: queue index
253  *
254  * Free all transmit software resources
255  */
256 static void ena_free_tx_resources(struct ena_adapter *adapter, int qid)
257 {
258         struct ena_ring *tx_ring = &adapter->tx_ring[qid];
259
260         vfree(tx_ring->tx_buffer_info);
261         tx_ring->tx_buffer_info = NULL;
262
263         vfree(tx_ring->free_tx_ids);
264         tx_ring->free_tx_ids = NULL;
265 }
266
267 /* ena_setup_all_tx_resources - allocate I/O Tx queues resources for All queues
268  * @adapter: private structure
269  *
270  * Return 0 on success, negative on failure
271  */
272 static int ena_setup_all_tx_resources(struct ena_adapter *adapter)
273 {
274         int i, rc = 0;
275
276         for (i = 0; i < adapter->num_queues; i++) {
277                 rc = ena_setup_tx_resources(adapter, i);
278                 if (rc)
279                         goto err_setup_tx;
280         }
281
282         return 0;
283
284 err_setup_tx:
285
286         netif_err(adapter, ifup, adapter->netdev,
287                   "Tx queue %d: allocation failed\n", i);
288
289         /* rewind the index freeing the rings as we go */
290         while (i--)
291                 ena_free_tx_resources(adapter, i);
292         return rc;
293 }
294
295 /* ena_free_all_io_tx_resources - Free I/O Tx Resources for All Queues
296  * @adapter: board private structure
297  *
298  * Free all transmit software resources
299  */
300 static void ena_free_all_io_tx_resources(struct ena_adapter *adapter)
301 {
302         int i;
303
304         for (i = 0; i < adapter->num_queues; i++)
305                 ena_free_tx_resources(adapter, i);
306 }
307
308 /* ena_setup_rx_resources - allocate I/O Rx resources (Descriptors)
309  * @adapter: network interface device structure
310  * @qid: queue index
311  *
312  * Returns 0 on success, negative on failure
313  */
314 static int ena_setup_rx_resources(struct ena_adapter *adapter,
315                                   u32 qid)
316 {
317         struct ena_ring *rx_ring = &adapter->rx_ring[qid];
318         struct ena_irq *ena_irq = &adapter->irq_tbl[ENA_IO_IRQ_IDX(qid)];
319         int size, node;
320
321         if (rx_ring->rx_buffer_info) {
322                 netif_err(adapter, ifup, adapter->netdev,
323                           "rx_buffer_info is not NULL");
324                 return -EEXIST;
325         }
326
327         /* alloc extra element so in rx path
328          * we can always prefetch rx_info + 1
329          */
330         size = sizeof(struct ena_rx_buffer) * (rx_ring->ring_size + 1);
331         node = cpu_to_node(ena_irq->cpu);
332
333         rx_ring->rx_buffer_info = vzalloc_node(size, node);
334         if (!rx_ring->rx_buffer_info) {
335                 rx_ring->rx_buffer_info = vzalloc(size);
336                 if (!rx_ring->rx_buffer_info)
337                         return -ENOMEM;
338         }
339
340         /* Reset rx statistics */
341         memset(&rx_ring->rx_stats, 0x0, sizeof(rx_ring->rx_stats));
342
343         rx_ring->next_to_clean = 0;
344         rx_ring->next_to_use = 0;
345         rx_ring->cpu = ena_irq->cpu;
346
347         return 0;
348 }
349
350 /* ena_free_rx_resources - Free I/O Rx Resources
351  * @adapter: network interface device structure
352  * @qid: queue index
353  *
354  * Free all receive software resources
355  */
356 static void ena_free_rx_resources(struct ena_adapter *adapter,
357                                   u32 qid)
358 {
359         struct ena_ring *rx_ring = &adapter->rx_ring[qid];
360
361         vfree(rx_ring->rx_buffer_info);
362         rx_ring->rx_buffer_info = NULL;
363 }
364
365 /* ena_setup_all_rx_resources - allocate I/O Rx queues resources for all queues
366  * @adapter: board private structure
367  *
368  * Return 0 on success, negative on failure
369  */
370 static int ena_setup_all_rx_resources(struct ena_adapter *adapter)
371 {
372         int i, rc = 0;
373
374         for (i = 0; i < adapter->num_queues; i++) {
375                 rc = ena_setup_rx_resources(adapter, i);
376                 if (rc)
377                         goto err_setup_rx;
378         }
379
380         return 0;
381
382 err_setup_rx:
383
384         netif_err(adapter, ifup, adapter->netdev,
385                   "Rx queue %d: allocation failed\n", i);
386
387         /* rewind the index freeing the rings as we go */
388         while (i--)
389                 ena_free_rx_resources(adapter, i);
390         return rc;
391 }
392
393 /* ena_free_all_io_rx_resources - Free I/O Rx Resources for All Queues
394  * @adapter: board private structure
395  *
396  * Free all receive software resources
397  */
398 static void ena_free_all_io_rx_resources(struct ena_adapter *adapter)
399 {
400         int i;
401
402         for (i = 0; i < adapter->num_queues; i++)
403                 ena_free_rx_resources(adapter, i);
404 }
405
406 static inline int ena_alloc_rx_page(struct ena_ring *rx_ring,
407                                     struct ena_rx_buffer *rx_info, gfp_t gfp)
408 {
409         struct ena_com_buf *ena_buf;
410         struct page *page;
411         dma_addr_t dma;
412
413         /* if previous allocated page is not used */
414         if (unlikely(rx_info->page))
415                 return 0;
416
417         page = alloc_page(gfp);
418         if (unlikely(!page)) {
419                 u64_stats_update_begin(&rx_ring->syncp);
420                 rx_ring->rx_stats.page_alloc_fail++;
421                 u64_stats_update_end(&rx_ring->syncp);
422                 return -ENOMEM;
423         }
424
425         dma = dma_map_page(rx_ring->dev, page, 0, PAGE_SIZE,
426                            DMA_FROM_DEVICE);
427         if (unlikely(dma_mapping_error(rx_ring->dev, dma))) {
428                 u64_stats_update_begin(&rx_ring->syncp);
429                 rx_ring->rx_stats.dma_mapping_err++;
430                 u64_stats_update_end(&rx_ring->syncp);
431
432                 __free_page(page);
433                 return -EIO;
434         }
435         netif_dbg(rx_ring->adapter, rx_status, rx_ring->netdev,
436                   "alloc page %p, rx_info %p\n", page, rx_info);
437
438         rx_info->page = page;
439         rx_info->page_offset = 0;
440         ena_buf = &rx_info->ena_buf;
441         ena_buf->paddr = dma;
442         ena_buf->len = PAGE_SIZE;
443
444         return 0;
445 }
446
447 static void ena_free_rx_page(struct ena_ring *rx_ring,
448                              struct ena_rx_buffer *rx_info)
449 {
450         struct page *page = rx_info->page;
451         struct ena_com_buf *ena_buf = &rx_info->ena_buf;
452
453         if (unlikely(!page)) {
454                 netif_warn(rx_ring->adapter, rx_err, rx_ring->netdev,
455                            "Trying to free unallocated buffer\n");
456                 return;
457         }
458
459         dma_unmap_page(rx_ring->dev, ena_buf->paddr, PAGE_SIZE,
460                        DMA_FROM_DEVICE);
461
462         __free_page(page);
463         rx_info->page = NULL;
464 }
465
466 static int ena_refill_rx_bufs(struct ena_ring *rx_ring, u32 num)
467 {
468         u16 next_to_use;
469         u32 i;
470         int rc;
471
472         next_to_use = rx_ring->next_to_use;
473
474         for (i = 0; i < num; i++) {
475                 struct ena_rx_buffer *rx_info =
476                         &rx_ring->rx_buffer_info[next_to_use];
477
478                 rc = ena_alloc_rx_page(rx_ring, rx_info,
479                                        __GFP_COLD | GFP_ATOMIC | __GFP_COMP);
480                 if (unlikely(rc < 0)) {
481                         netif_warn(rx_ring->adapter, rx_err, rx_ring->netdev,
482                                    "failed to alloc buffer for rx queue %d\n",
483                                    rx_ring->qid);
484                         break;
485                 }
486                 rc = ena_com_add_single_rx_desc(rx_ring->ena_com_io_sq,
487                                                 &rx_info->ena_buf,
488                                                 next_to_use);
489                 if (unlikely(rc)) {
490                         netif_warn(rx_ring->adapter, rx_status, rx_ring->netdev,
491                                    "failed to add buffer for rx queue %d\n",
492                                    rx_ring->qid);
493                         break;
494                 }
495                 next_to_use = ENA_RX_RING_IDX_NEXT(next_to_use,
496                                                    rx_ring->ring_size);
497         }
498
499         if (unlikely(i < num)) {
500                 u64_stats_update_begin(&rx_ring->syncp);
501                 rx_ring->rx_stats.refil_partial++;
502                 u64_stats_update_end(&rx_ring->syncp);
503                 netdev_warn(rx_ring->netdev,
504                             "refilled rx qid %d with only %d buffers (from %d)\n",
505                             rx_ring->qid, i, num);
506         }
507
508         if (likely(i)) {
509                 /* Add memory barrier to make sure the desc were written before
510                  * issue a doorbell
511                  */
512                 wmb();
513                 ena_com_write_sq_doorbell(rx_ring->ena_com_io_sq);
514         }
515
516         rx_ring->next_to_use = next_to_use;
517
518         return i;
519 }
520
521 static void ena_free_rx_bufs(struct ena_adapter *adapter,
522                              u32 qid)
523 {
524         struct ena_ring *rx_ring = &adapter->rx_ring[qid];
525         u32 i;
526
527         for (i = 0; i < rx_ring->ring_size; i++) {
528                 struct ena_rx_buffer *rx_info = &rx_ring->rx_buffer_info[i];
529
530                 if (rx_info->page)
531                         ena_free_rx_page(rx_ring, rx_info);
532         }
533 }
534
535 /* ena_refill_all_rx_bufs - allocate all queues Rx buffers
536  * @adapter: board private structure
537  *
538  */
539 static void ena_refill_all_rx_bufs(struct ena_adapter *adapter)
540 {
541         struct ena_ring *rx_ring;
542         int i, rc, bufs_num;
543
544         for (i = 0; i < adapter->num_queues; i++) {
545                 rx_ring = &adapter->rx_ring[i];
546                 bufs_num = rx_ring->ring_size - 1;
547                 rc = ena_refill_rx_bufs(rx_ring, bufs_num);
548
549                 if (unlikely(rc != bufs_num))
550                         netif_warn(rx_ring->adapter, rx_status, rx_ring->netdev,
551                                    "refilling Queue %d failed. allocated %d buffers from: %d\n",
552                                    i, rc, bufs_num);
553         }
554 }
555
556 static void ena_free_all_rx_bufs(struct ena_adapter *adapter)
557 {
558         int i;
559
560         for (i = 0; i < adapter->num_queues; i++)
561                 ena_free_rx_bufs(adapter, i);
562 }
563
564 /* ena_free_tx_bufs - Free Tx Buffers per Queue
565  * @tx_ring: TX ring for which buffers be freed
566  */
567 static void ena_free_tx_bufs(struct ena_ring *tx_ring)
568 {
569         u32 i;
570
571         for (i = 0; i < tx_ring->ring_size; i++) {
572                 struct ena_tx_buffer *tx_info = &tx_ring->tx_buffer_info[i];
573                 struct ena_com_buf *ena_buf;
574                 int nr_frags;
575                 int j;
576
577                 if (!tx_info->skb)
578                         continue;
579
580                 netdev_notice(tx_ring->netdev,
581                               "free uncompleted tx skb qid %d idx 0x%x\n",
582                               tx_ring->qid, i);
583
584                 ena_buf = tx_info->bufs;
585                 dma_unmap_single(tx_ring->dev,
586                                  ena_buf->paddr,
587                                  ena_buf->len,
588                                  DMA_TO_DEVICE);
589
590                 /* unmap remaining mapped pages */
591                 nr_frags = tx_info->num_of_bufs - 1;
592                 for (j = 0; j < nr_frags; j++) {
593                         ena_buf++;
594                         dma_unmap_page(tx_ring->dev,
595                                        ena_buf->paddr,
596                                        ena_buf->len,
597                                        DMA_TO_DEVICE);
598                 }
599
600                 dev_kfree_skb_any(tx_info->skb);
601         }
602         netdev_tx_reset_queue(netdev_get_tx_queue(tx_ring->netdev,
603                                                   tx_ring->qid));
604 }
605
606 static void ena_free_all_tx_bufs(struct ena_adapter *adapter)
607 {
608         struct ena_ring *tx_ring;
609         int i;
610
611         for (i = 0; i < adapter->num_queues; i++) {
612                 tx_ring = &adapter->tx_ring[i];
613                 ena_free_tx_bufs(tx_ring);
614         }
615 }
616
617 static void ena_destroy_all_tx_queues(struct ena_adapter *adapter)
618 {
619         u16 ena_qid;
620         int i;
621
622         for (i = 0; i < adapter->num_queues; i++) {
623                 ena_qid = ENA_IO_TXQ_IDX(i);
624                 ena_com_destroy_io_queue(adapter->ena_dev, ena_qid);
625         }
626 }
627
628 static void ena_destroy_all_rx_queues(struct ena_adapter *adapter)
629 {
630         u16 ena_qid;
631         int i;
632
633         for (i = 0; i < adapter->num_queues; i++) {
634                 ena_qid = ENA_IO_RXQ_IDX(i);
635                 ena_com_destroy_io_queue(adapter->ena_dev, ena_qid);
636         }
637 }
638
639 static void ena_destroy_all_io_queues(struct ena_adapter *adapter)
640 {
641         ena_destroy_all_tx_queues(adapter);
642         ena_destroy_all_rx_queues(adapter);
643 }
644
645 static int validate_tx_req_id(struct ena_ring *tx_ring, u16 req_id)
646 {
647         struct ena_tx_buffer *tx_info = NULL;
648
649         if (likely(req_id < tx_ring->ring_size)) {
650                 tx_info = &tx_ring->tx_buffer_info[req_id];
651                 if (likely(tx_info->skb))
652                         return 0;
653         }
654
655         if (tx_info)
656                 netif_err(tx_ring->adapter, tx_done, tx_ring->netdev,
657                           "tx_info doesn't have valid skb\n");
658         else
659                 netif_err(tx_ring->adapter, tx_done, tx_ring->netdev,
660                           "Invalid req_id: %hu\n", req_id);
661
662         u64_stats_update_begin(&tx_ring->syncp);
663         tx_ring->tx_stats.bad_req_id++;
664         u64_stats_update_end(&tx_ring->syncp);
665
666         /* Trigger device reset */
667         set_bit(ENA_FLAG_TRIGGER_RESET, &tx_ring->adapter->flags);
668         return -EFAULT;
669 }
670
671 static int ena_clean_tx_irq(struct ena_ring *tx_ring, u32 budget)
672 {
673         struct netdev_queue *txq;
674         bool above_thresh;
675         u32 tx_bytes = 0;
676         u32 total_done = 0;
677         u16 next_to_clean;
678         u16 req_id;
679         int tx_pkts = 0;
680         int rc;
681
682         next_to_clean = tx_ring->next_to_clean;
683         txq = netdev_get_tx_queue(tx_ring->netdev, tx_ring->qid);
684
685         while (tx_pkts < budget) {
686                 struct ena_tx_buffer *tx_info;
687                 struct sk_buff *skb;
688                 struct ena_com_buf *ena_buf;
689                 int i, nr_frags;
690
691                 rc = ena_com_tx_comp_req_id_get(tx_ring->ena_com_io_cq,
692                                                 &req_id);
693                 if (rc)
694                         break;
695
696                 rc = validate_tx_req_id(tx_ring, req_id);
697                 if (rc)
698                         break;
699
700                 tx_info = &tx_ring->tx_buffer_info[req_id];
701                 skb = tx_info->skb;
702
703                 /* prefetch skb_end_pointer() to speedup skb_shinfo(skb) */
704                 prefetch(&skb->end);
705
706                 tx_info->skb = NULL;
707                 tx_info->last_jiffies = 0;
708
709                 if (likely(tx_info->num_of_bufs != 0)) {
710                         ena_buf = tx_info->bufs;
711
712                         dma_unmap_single(tx_ring->dev,
713                                          dma_unmap_addr(ena_buf, paddr),
714                                          dma_unmap_len(ena_buf, len),
715                                          DMA_TO_DEVICE);
716
717                         /* unmap remaining mapped pages */
718                         nr_frags = tx_info->num_of_bufs - 1;
719                         for (i = 0; i < nr_frags; i++) {
720                                 ena_buf++;
721                                 dma_unmap_page(tx_ring->dev,
722                                                dma_unmap_addr(ena_buf, paddr),
723                                                dma_unmap_len(ena_buf, len),
724                                                DMA_TO_DEVICE);
725                         }
726                 }
727
728                 netif_dbg(tx_ring->adapter, tx_done, tx_ring->netdev,
729                           "tx_poll: q %d skb %p completed\n", tx_ring->qid,
730                           skb);
731
732                 tx_bytes += skb->len;
733                 dev_kfree_skb(skb);
734                 tx_pkts++;
735                 total_done += tx_info->tx_descs;
736
737                 tx_ring->free_tx_ids[next_to_clean] = req_id;
738                 next_to_clean = ENA_TX_RING_IDX_NEXT(next_to_clean,
739                                                      tx_ring->ring_size);
740         }
741
742         tx_ring->next_to_clean = next_to_clean;
743         ena_com_comp_ack(tx_ring->ena_com_io_sq, total_done);
744         ena_com_update_dev_comp_head(tx_ring->ena_com_io_cq);
745
746         netdev_tx_completed_queue(txq, tx_pkts, tx_bytes);
747
748         netif_dbg(tx_ring->adapter, tx_done, tx_ring->netdev,
749                   "tx_poll: q %d done. total pkts: %d\n",
750                   tx_ring->qid, tx_pkts);
751
752         /* need to make the rings circular update visible to
753          * ena_start_xmit() before checking for netif_queue_stopped().
754          */
755         smp_mb();
756
757         above_thresh = ena_com_sq_empty_space(tx_ring->ena_com_io_sq) >
758                 ENA_TX_WAKEUP_THRESH;
759         if (unlikely(netif_tx_queue_stopped(txq) && above_thresh)) {
760                 __netif_tx_lock(txq, smp_processor_id());
761                 above_thresh = ena_com_sq_empty_space(tx_ring->ena_com_io_sq) >
762                         ENA_TX_WAKEUP_THRESH;
763                 if (netif_tx_queue_stopped(txq) && above_thresh) {
764                         netif_tx_wake_queue(txq);
765                         u64_stats_update_begin(&tx_ring->syncp);
766                         tx_ring->tx_stats.queue_wakeup++;
767                         u64_stats_update_end(&tx_ring->syncp);
768                 }
769                 __netif_tx_unlock(txq);
770         }
771
772         tx_ring->per_napi_bytes += tx_bytes;
773         tx_ring->per_napi_packets += tx_pkts;
774
775         return tx_pkts;
776 }
777
778 static struct sk_buff *ena_rx_skb(struct ena_ring *rx_ring,
779                                   struct ena_com_rx_buf_info *ena_bufs,
780                                   u32 descs,
781                                   u16 *next_to_clean)
782 {
783         struct sk_buff *skb;
784         struct ena_rx_buffer *rx_info =
785                 &rx_ring->rx_buffer_info[*next_to_clean];
786         u32 len;
787         u32 buf = 0;
788         void *va;
789
790         len = ena_bufs[0].len;
791         if (unlikely(!rx_info->page)) {
792                 netif_err(rx_ring->adapter, rx_err, rx_ring->netdev,
793                           "Page is NULL\n");
794                 return NULL;
795         }
796
797         netif_dbg(rx_ring->adapter, rx_status, rx_ring->netdev,
798                   "rx_info %p page %p\n",
799                   rx_info, rx_info->page);
800
801         /* save virt address of first buffer */
802         va = page_address(rx_info->page) + rx_info->page_offset;
803         prefetch(va + NET_IP_ALIGN);
804
805         if (len <= rx_ring->rx_copybreak) {
806                 skb = netdev_alloc_skb_ip_align(rx_ring->netdev,
807                                                 rx_ring->rx_copybreak);
808                 if (unlikely(!skb)) {
809                         u64_stats_update_begin(&rx_ring->syncp);
810                         rx_ring->rx_stats.skb_alloc_fail++;
811                         u64_stats_update_end(&rx_ring->syncp);
812                         netif_err(rx_ring->adapter, rx_err, rx_ring->netdev,
813                                   "Failed to allocate skb\n");
814                         return NULL;
815                 }
816
817                 netif_dbg(rx_ring->adapter, rx_status, rx_ring->netdev,
818                           "rx allocated small packet. len %d. data_len %d\n",
819                           skb->len, skb->data_len);
820
821                 /* sync this buffer for CPU use */
822                 dma_sync_single_for_cpu(rx_ring->dev,
823                                         dma_unmap_addr(&rx_info->ena_buf, paddr),
824                                         len,
825                                         DMA_FROM_DEVICE);
826                 skb_copy_to_linear_data(skb, va, len);
827                 dma_sync_single_for_device(rx_ring->dev,
828                                            dma_unmap_addr(&rx_info->ena_buf, paddr),
829                                            len,
830                                            DMA_FROM_DEVICE);
831
832                 skb_put(skb, len);
833                 skb->protocol = eth_type_trans(skb, rx_ring->netdev);
834                 *next_to_clean = ENA_RX_RING_IDX_ADD(*next_to_clean, descs,
835                                                      rx_ring->ring_size);
836                 return skb;
837         }
838
839         skb = napi_get_frags(rx_ring->napi);
840         if (unlikely(!skb)) {
841                 netif_dbg(rx_ring->adapter, rx_status, rx_ring->netdev,
842                           "Failed allocating skb\n");
843                 u64_stats_update_begin(&rx_ring->syncp);
844                 rx_ring->rx_stats.skb_alloc_fail++;
845                 u64_stats_update_end(&rx_ring->syncp);
846                 return NULL;
847         }
848
849         do {
850                 dma_unmap_page(rx_ring->dev,
851                                dma_unmap_addr(&rx_info->ena_buf, paddr),
852                                PAGE_SIZE, DMA_FROM_DEVICE);
853
854                 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, rx_info->page,
855                                 rx_info->page_offset, len, PAGE_SIZE);
856
857                 netif_dbg(rx_ring->adapter, rx_status, rx_ring->netdev,
858                           "rx skb updated. len %d. data_len %d\n",
859                           skb->len, skb->data_len);
860
861                 rx_info->page = NULL;
862                 *next_to_clean =
863                         ENA_RX_RING_IDX_NEXT(*next_to_clean,
864                                              rx_ring->ring_size);
865                 if (likely(--descs == 0))
866                         break;
867                 rx_info = &rx_ring->rx_buffer_info[*next_to_clean];
868                 len = ena_bufs[++buf].len;
869         } while (1);
870
871         return skb;
872 }
873
874 /* ena_rx_checksum - indicate in skb if hw indicated a good cksum
875  * @adapter: structure containing adapter specific data
876  * @ena_rx_ctx: received packet context/metadata
877  * @skb: skb currently being received and modified
878  */
879 static inline void ena_rx_checksum(struct ena_ring *rx_ring,
880                                    struct ena_com_rx_ctx *ena_rx_ctx,
881                                    struct sk_buff *skb)
882 {
883         /* Rx csum disabled */
884         if (unlikely(!(rx_ring->netdev->features & NETIF_F_RXCSUM))) {
885                 skb->ip_summed = CHECKSUM_NONE;
886                 return;
887         }
888
889         /* For fragmented packets the checksum isn't valid */
890         if (ena_rx_ctx->frag) {
891                 skb->ip_summed = CHECKSUM_NONE;
892                 return;
893         }
894
895         /* if IP and error */
896         if (unlikely((ena_rx_ctx->l3_proto == ENA_ETH_IO_L3_PROTO_IPV4) &&
897                      (ena_rx_ctx->l3_csum_err))) {
898                 /* ipv4 checksum error */
899                 skb->ip_summed = CHECKSUM_NONE;
900                 u64_stats_update_begin(&rx_ring->syncp);
901                 rx_ring->rx_stats.bad_csum++;
902                 u64_stats_update_end(&rx_ring->syncp);
903                 netif_err(rx_ring->adapter, rx_err, rx_ring->netdev,
904                           "RX IPv4 header checksum error\n");
905                 return;
906         }
907
908         /* if TCP/UDP */
909         if (likely((ena_rx_ctx->l4_proto == ENA_ETH_IO_L4_PROTO_TCP) ||
910                    (ena_rx_ctx->l4_proto == ENA_ETH_IO_L4_PROTO_UDP))) {
911                 if (unlikely(ena_rx_ctx->l4_csum_err)) {
912                         /* TCP/UDP checksum error */
913                         u64_stats_update_begin(&rx_ring->syncp);
914                         rx_ring->rx_stats.bad_csum++;
915                         u64_stats_update_end(&rx_ring->syncp);
916                         netif_err(rx_ring->adapter, rx_err, rx_ring->netdev,
917                                   "RX L4 checksum error\n");
918                         skb->ip_summed = CHECKSUM_NONE;
919                         return;
920                 }
921
922                 skb->ip_summed = CHECKSUM_UNNECESSARY;
923         }
924 }
925
926 static void ena_set_rx_hash(struct ena_ring *rx_ring,
927                             struct ena_com_rx_ctx *ena_rx_ctx,
928                             struct sk_buff *skb)
929 {
930         enum pkt_hash_types hash_type;
931
932         if (likely(rx_ring->netdev->features & NETIF_F_RXHASH)) {
933                 if (likely((ena_rx_ctx->l4_proto == ENA_ETH_IO_L4_PROTO_TCP) ||
934                            (ena_rx_ctx->l4_proto == ENA_ETH_IO_L4_PROTO_UDP)))
935
936                         hash_type = PKT_HASH_TYPE_L4;
937                 else
938                         hash_type = PKT_HASH_TYPE_NONE;
939
940                 /* Override hash type if the packet is fragmented */
941                 if (ena_rx_ctx->frag)
942                         hash_type = PKT_HASH_TYPE_NONE;
943
944                 skb_set_hash(skb, ena_rx_ctx->hash, hash_type);
945         }
946 }
947
948 /* ena_clean_rx_irq - Cleanup RX irq
949  * @rx_ring: RX ring to clean
950  * @napi: napi handler
951  * @budget: how many packets driver is allowed to clean
952  *
953  * Returns the number of cleaned buffers.
954  */
955 static int ena_clean_rx_irq(struct ena_ring *rx_ring, struct napi_struct *napi,
956                             u32 budget)
957 {
958         u16 next_to_clean = rx_ring->next_to_clean;
959         u32 res_budget, work_done;
960
961         struct ena_com_rx_ctx ena_rx_ctx;
962         struct ena_adapter *adapter;
963         struct sk_buff *skb;
964         int refill_required;
965         int refill_threshold;
966         int rc = 0;
967         int total_len = 0;
968         int rx_copybreak_pkt = 0;
969
970         netif_dbg(rx_ring->adapter, rx_status, rx_ring->netdev,
971                   "%s qid %d\n", __func__, rx_ring->qid);
972         res_budget = budget;
973
974         do {
975                 ena_rx_ctx.ena_bufs = rx_ring->ena_bufs;
976                 ena_rx_ctx.max_bufs = rx_ring->sgl_size;
977                 ena_rx_ctx.descs = 0;
978                 rc = ena_com_rx_pkt(rx_ring->ena_com_io_cq,
979                                     rx_ring->ena_com_io_sq,
980                                     &ena_rx_ctx);
981                 if (unlikely(rc))
982                         goto error;
983
984                 if (unlikely(ena_rx_ctx.descs == 0))
985                         break;
986
987                 netif_dbg(rx_ring->adapter, rx_status, rx_ring->netdev,
988                           "rx_poll: q %d got packet from ena. descs #: %d l3 proto %d l4 proto %d hash: %x\n",
989                           rx_ring->qid, ena_rx_ctx.descs, ena_rx_ctx.l3_proto,
990                           ena_rx_ctx.l4_proto, ena_rx_ctx.hash);
991
992                 /* allocate skb and fill it */
993                 skb = ena_rx_skb(rx_ring, rx_ring->ena_bufs, ena_rx_ctx.descs,
994                                  &next_to_clean);
995
996                 /* exit if we failed to retrieve a buffer */
997                 if (unlikely(!skb)) {
998                         next_to_clean = ENA_RX_RING_IDX_ADD(next_to_clean,
999                                                             ena_rx_ctx.descs,
1000                                                             rx_ring->ring_size);
1001                         break;
1002                 }
1003
1004                 ena_rx_checksum(rx_ring, &ena_rx_ctx, skb);
1005
1006                 ena_set_rx_hash(rx_ring, &ena_rx_ctx, skb);
1007
1008                 skb_record_rx_queue(skb, rx_ring->qid);
1009
1010                 if (rx_ring->ena_bufs[0].len <= rx_ring->rx_copybreak) {
1011                         total_len += rx_ring->ena_bufs[0].len;
1012                         rx_copybreak_pkt++;
1013                         napi_gro_receive(napi, skb);
1014                 } else {
1015                         total_len += skb->len;
1016                         napi_gro_frags(napi);
1017                 }
1018
1019                 res_budget--;
1020         } while (likely(res_budget));
1021
1022         work_done = budget - res_budget;
1023         rx_ring->per_napi_bytes += total_len;
1024         rx_ring->per_napi_packets += work_done;
1025         u64_stats_update_begin(&rx_ring->syncp);
1026         rx_ring->rx_stats.bytes += total_len;
1027         rx_ring->rx_stats.cnt += work_done;
1028         rx_ring->rx_stats.rx_copybreak_pkt += rx_copybreak_pkt;
1029         u64_stats_update_end(&rx_ring->syncp);
1030
1031         rx_ring->next_to_clean = next_to_clean;
1032
1033         refill_required = ena_com_sq_empty_space(rx_ring->ena_com_io_sq);
1034         refill_threshold = rx_ring->ring_size / ENA_RX_REFILL_THRESH_DIVIDER;
1035
1036         /* Optimization, try to batch new rx buffers */
1037         if (refill_required > refill_threshold) {
1038                 ena_com_update_dev_comp_head(rx_ring->ena_com_io_cq);
1039                 ena_refill_rx_bufs(rx_ring, refill_required);
1040         }
1041
1042         return work_done;
1043
1044 error:
1045         adapter = netdev_priv(rx_ring->netdev);
1046
1047         u64_stats_update_begin(&rx_ring->syncp);
1048         rx_ring->rx_stats.bad_desc_num++;
1049         u64_stats_update_end(&rx_ring->syncp);
1050
1051         /* Too many desc from the device. Trigger reset */
1052         set_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags);
1053
1054         return 0;
1055 }
1056
1057 inline void ena_adjust_intr_moderation(struct ena_ring *rx_ring,
1058                                        struct ena_ring *tx_ring)
1059 {
1060         /* We apply adaptive moderation on Rx path only.
1061          * Tx uses static interrupt moderation.
1062          */
1063         ena_com_calculate_interrupt_delay(rx_ring->ena_dev,
1064                                           rx_ring->per_napi_packets,
1065                                           rx_ring->per_napi_bytes,
1066                                           &rx_ring->smoothed_interval,
1067                                           &rx_ring->moder_tbl_idx);
1068
1069         /* Reset per napi packets/bytes */
1070         tx_ring->per_napi_packets = 0;
1071         tx_ring->per_napi_bytes = 0;
1072         rx_ring->per_napi_packets = 0;
1073         rx_ring->per_napi_bytes = 0;
1074 }
1075
1076 static inline void ena_update_ring_numa_node(struct ena_ring *tx_ring,
1077                                              struct ena_ring *rx_ring)
1078 {
1079         int cpu = get_cpu();
1080         int numa_node;
1081
1082         /* Check only one ring since the 2 rings are running on the same cpu */
1083         if (likely(tx_ring->cpu == cpu))
1084                 goto out;
1085
1086         numa_node = cpu_to_node(cpu);
1087         put_cpu();
1088
1089         if (numa_node != NUMA_NO_NODE) {
1090                 ena_com_update_numa_node(tx_ring->ena_com_io_cq, numa_node);
1091                 ena_com_update_numa_node(rx_ring->ena_com_io_cq, numa_node);
1092         }
1093
1094         tx_ring->cpu = cpu;
1095         rx_ring->cpu = cpu;
1096
1097         return;
1098 out:
1099         put_cpu();
1100 }
1101
1102 static int ena_io_poll(struct napi_struct *napi, int budget)
1103 {
1104         struct ena_napi *ena_napi = container_of(napi, struct ena_napi, napi);
1105         struct ena_ring *tx_ring, *rx_ring;
1106         struct ena_eth_io_intr_reg intr_reg;
1107
1108         u32 tx_work_done;
1109         u32 rx_work_done;
1110         int tx_budget;
1111         int napi_comp_call = 0;
1112         int ret;
1113
1114         tx_ring = ena_napi->tx_ring;
1115         rx_ring = ena_napi->rx_ring;
1116
1117         tx_budget = tx_ring->ring_size / ENA_TX_POLL_BUDGET_DIVIDER;
1118
1119         if (!test_bit(ENA_FLAG_DEV_UP, &tx_ring->adapter->flags)) {
1120                 napi_complete_done(napi, 0);
1121                 return 0;
1122         }
1123
1124         tx_work_done = ena_clean_tx_irq(tx_ring, tx_budget);
1125         rx_work_done = ena_clean_rx_irq(rx_ring, napi, budget);
1126
1127         if ((budget > rx_work_done) && (tx_budget > tx_work_done)) {
1128                 napi_complete_done(napi, rx_work_done);
1129
1130                 napi_comp_call = 1;
1131                 /* Tx and Rx share the same interrupt vector */
1132                 if (ena_com_get_adaptive_moderation_enabled(rx_ring->ena_dev))
1133                         ena_adjust_intr_moderation(rx_ring, tx_ring);
1134
1135                 /* Update intr register: rx intr delay, tx intr delay and
1136                  * interrupt unmask
1137                  */
1138                 ena_com_update_intr_reg(&intr_reg,
1139                                         rx_ring->smoothed_interval,
1140                                         tx_ring->smoothed_interval,
1141                                         true);
1142
1143                 /* It is a shared MSI-X. Tx and Rx CQ have pointer to it.
1144                  * So we use one of them to reach the intr reg
1145                  */
1146                 ena_com_unmask_intr(rx_ring->ena_com_io_cq, &intr_reg);
1147
1148                 ena_update_ring_numa_node(tx_ring, rx_ring);
1149
1150                 ret = rx_work_done;
1151         } else {
1152                 ret = budget;
1153         }
1154
1155         u64_stats_update_begin(&tx_ring->syncp);
1156         tx_ring->tx_stats.napi_comp += napi_comp_call;
1157         tx_ring->tx_stats.tx_poll++;
1158         u64_stats_update_end(&tx_ring->syncp);
1159
1160         return ret;
1161 }
1162
1163 static irqreturn_t ena_intr_msix_mgmnt(int irq, void *data)
1164 {
1165         struct ena_adapter *adapter = (struct ena_adapter *)data;
1166
1167         ena_com_admin_q_comp_intr_handler(adapter->ena_dev);
1168
1169         /* Don't call the aenq handler before probe is done */
1170         if (likely(test_bit(ENA_FLAG_DEVICE_RUNNING, &adapter->flags)))
1171                 ena_com_aenq_intr_handler(adapter->ena_dev, data);
1172
1173         return IRQ_HANDLED;
1174 }
1175
1176 /* ena_intr_msix_io - MSI-X Interrupt Handler for Tx/Rx
1177  * @irq: interrupt number
1178  * @data: pointer to a network interface private napi device structure
1179  */
1180 static irqreturn_t ena_intr_msix_io(int irq, void *data)
1181 {
1182         struct ena_napi *ena_napi = data;
1183
1184         napi_schedule(&ena_napi->napi);
1185
1186         return IRQ_HANDLED;
1187 }
1188
1189 static int ena_enable_msix(struct ena_adapter *adapter, int num_queues)
1190 {
1191         int i, msix_vecs, rc;
1192
1193         if (test_bit(ENA_FLAG_MSIX_ENABLED, &adapter->flags)) {
1194                 netif_err(adapter, probe, adapter->netdev,
1195                           "Error, MSI-X is already enabled\n");
1196                 return -EPERM;
1197         }
1198
1199         /* Reserved the max msix vectors we might need */
1200         msix_vecs = ENA_MAX_MSIX_VEC(num_queues);
1201
1202         netif_dbg(adapter, probe, adapter->netdev,
1203                   "trying to enable MSI-X, vectors %d\n", msix_vecs);
1204
1205         adapter->msix_entries = vzalloc(msix_vecs * sizeof(struct msix_entry));
1206
1207         if (!adapter->msix_entries)
1208                 return -ENOMEM;
1209
1210         for (i = 0; i < msix_vecs; i++)
1211                 adapter->msix_entries[i].entry = i;
1212
1213         rc = pci_enable_msix(adapter->pdev, adapter->msix_entries, msix_vecs);
1214         if (rc != 0) {
1215                 netif_err(adapter, probe, adapter->netdev,
1216                           "Failed to enable MSI-X, vectors %d rc %d\n",
1217                           msix_vecs, rc);
1218                 return -ENOSPC;
1219         }
1220
1221         netif_dbg(adapter, probe, adapter->netdev, "enable MSI-X, vectors %d\n",
1222                   msix_vecs);
1223
1224         if (msix_vecs >= 1) {
1225                 if (ena_init_rx_cpu_rmap(adapter))
1226                         netif_warn(adapter, probe, adapter->netdev,
1227                                    "Failed to map IRQs to CPUs\n");
1228         }
1229
1230         adapter->msix_vecs = msix_vecs;
1231         set_bit(ENA_FLAG_MSIX_ENABLED, &adapter->flags);
1232
1233         return 0;
1234 }
1235
1236 static void ena_setup_mgmnt_intr(struct ena_adapter *adapter)
1237 {
1238         u32 cpu;
1239
1240         snprintf(adapter->irq_tbl[ENA_MGMNT_IRQ_IDX].name,
1241                  ENA_IRQNAME_SIZE, "ena-mgmnt@pci:%s",
1242                  pci_name(adapter->pdev));
1243         adapter->irq_tbl[ENA_MGMNT_IRQ_IDX].handler =
1244                 ena_intr_msix_mgmnt;
1245         adapter->irq_tbl[ENA_MGMNT_IRQ_IDX].data = adapter;
1246         adapter->irq_tbl[ENA_MGMNT_IRQ_IDX].vector =
1247                 adapter->msix_entries[ENA_MGMNT_IRQ_IDX].vector;
1248         cpu = cpumask_first(cpu_online_mask);
1249         adapter->irq_tbl[ENA_MGMNT_IRQ_IDX].cpu = cpu;
1250         cpumask_set_cpu(cpu,
1251                         &adapter->irq_tbl[ENA_MGMNT_IRQ_IDX].affinity_hint_mask);
1252 }
1253
1254 static void ena_setup_io_intr(struct ena_adapter *adapter)
1255 {
1256         struct net_device *netdev;
1257         int irq_idx, i, cpu;
1258
1259         netdev = adapter->netdev;
1260
1261         for (i = 0; i < adapter->num_queues; i++) {
1262                 irq_idx = ENA_IO_IRQ_IDX(i);
1263                 cpu = i % num_online_cpus();
1264
1265                 snprintf(adapter->irq_tbl[irq_idx].name, ENA_IRQNAME_SIZE,
1266                          "%s-Tx-Rx-%d", netdev->name, i);
1267                 adapter->irq_tbl[irq_idx].handler = ena_intr_msix_io;
1268                 adapter->irq_tbl[irq_idx].data = &adapter->ena_napi[i];
1269                 adapter->irq_tbl[irq_idx].vector =
1270                         adapter->msix_entries[irq_idx].vector;
1271                 adapter->irq_tbl[irq_idx].cpu = cpu;
1272
1273                 cpumask_set_cpu(cpu,
1274                                 &adapter->irq_tbl[irq_idx].affinity_hint_mask);
1275         }
1276 }
1277
1278 static int ena_request_mgmnt_irq(struct ena_adapter *adapter)
1279 {
1280         unsigned long flags = 0;
1281         struct ena_irq *irq;
1282         int rc;
1283
1284         irq = &adapter->irq_tbl[ENA_MGMNT_IRQ_IDX];
1285         rc = request_irq(irq->vector, irq->handler, flags, irq->name,
1286                          irq->data);
1287         if (rc) {
1288                 netif_err(adapter, probe, adapter->netdev,
1289                           "failed to request admin irq\n");
1290                 return rc;
1291         }
1292
1293         netif_dbg(adapter, probe, adapter->netdev,
1294                   "set affinity hint of mgmnt irq.to 0x%lx (irq vector: %d)\n",
1295                   irq->affinity_hint_mask.bits[0], irq->vector);
1296
1297         irq_set_affinity_hint(irq->vector, &irq->affinity_hint_mask);
1298
1299         return rc;
1300 }
1301
1302 static int ena_request_io_irq(struct ena_adapter *adapter)
1303 {
1304         unsigned long flags = 0;
1305         struct ena_irq *irq;
1306         int rc = 0, i, k;
1307
1308         if (!test_bit(ENA_FLAG_MSIX_ENABLED, &adapter->flags)) {
1309                 netif_err(adapter, ifup, adapter->netdev,
1310                           "Failed to request I/O IRQ: MSI-X is not enabled\n");
1311                 return -EINVAL;
1312         }
1313
1314         for (i = ENA_IO_IRQ_FIRST_IDX; i < adapter->msix_vecs; i++) {
1315                 irq = &adapter->irq_tbl[i];
1316                 rc = request_irq(irq->vector, irq->handler, flags, irq->name,
1317                                  irq->data);
1318                 if (rc) {
1319                         netif_err(adapter, ifup, adapter->netdev,
1320                                   "Failed to request I/O IRQ. index %d rc %d\n",
1321                                    i, rc);
1322                         goto err;
1323                 }
1324
1325                 netif_dbg(adapter, ifup, adapter->netdev,
1326                           "set affinity hint of irq. index %d to 0x%lx (irq vector: %d)\n",
1327                           i, irq->affinity_hint_mask.bits[0], irq->vector);
1328
1329                 irq_set_affinity_hint(irq->vector, &irq->affinity_hint_mask);
1330         }
1331
1332         return rc;
1333
1334 err:
1335         for (k = ENA_IO_IRQ_FIRST_IDX; k < i; k++) {
1336                 irq = &adapter->irq_tbl[k];
1337                 free_irq(irq->vector, irq->data);
1338         }
1339
1340         return rc;
1341 }
1342
1343 static void ena_free_mgmnt_irq(struct ena_adapter *adapter)
1344 {
1345         struct ena_irq *irq;
1346
1347         irq = &adapter->irq_tbl[ENA_MGMNT_IRQ_IDX];
1348         synchronize_irq(irq->vector);
1349         irq_set_affinity_hint(irq->vector, NULL);
1350         free_irq(irq->vector, irq->data);
1351 }
1352
1353 static void ena_free_io_irq(struct ena_adapter *adapter)
1354 {
1355         struct ena_irq *irq;
1356         int i;
1357
1358 #ifdef CONFIG_RFS_ACCEL
1359         if (adapter->msix_vecs >= 1) {
1360                 free_irq_cpu_rmap(adapter->netdev->rx_cpu_rmap);
1361                 adapter->netdev->rx_cpu_rmap = NULL;
1362         }
1363 #endif /* CONFIG_RFS_ACCEL */
1364
1365         for (i = ENA_IO_IRQ_FIRST_IDX; i < adapter->msix_vecs; i++) {
1366                 irq = &adapter->irq_tbl[i];
1367                 irq_set_affinity_hint(irq->vector, NULL);
1368                 free_irq(irq->vector, irq->data);
1369         }
1370 }
1371
1372 static void ena_disable_msix(struct ena_adapter *adapter)
1373 {
1374         if (test_and_clear_bit(ENA_FLAG_MSIX_ENABLED, &adapter->flags))
1375                 pci_disable_msix(adapter->pdev);
1376
1377         if (adapter->msix_entries)
1378                 vfree(adapter->msix_entries);
1379         adapter->msix_entries = NULL;
1380 }
1381
1382 static void ena_disable_io_intr_sync(struct ena_adapter *adapter)
1383 {
1384         int i;
1385
1386         if (!netif_running(adapter->netdev))
1387                 return;
1388
1389         for (i = ENA_IO_IRQ_FIRST_IDX; i < adapter->msix_vecs; i++)
1390                 synchronize_irq(adapter->irq_tbl[i].vector);
1391 }
1392
1393 static void ena_del_napi(struct ena_adapter *adapter)
1394 {
1395         int i;
1396
1397         for (i = 0; i < adapter->num_queues; i++)
1398                 netif_napi_del(&adapter->ena_napi[i].napi);
1399 }
1400
1401 static void ena_init_napi(struct ena_adapter *adapter)
1402 {
1403         struct ena_napi *napi;
1404         int i;
1405
1406         for (i = 0; i < adapter->num_queues; i++) {
1407                 napi = &adapter->ena_napi[i];
1408
1409                 netif_napi_add(adapter->netdev,
1410                                &adapter->ena_napi[i].napi,
1411                                ena_io_poll,
1412                                ENA_NAPI_BUDGET);
1413                 napi->rx_ring = &adapter->rx_ring[i];
1414                 napi->tx_ring = &adapter->tx_ring[i];
1415                 napi->qid = i;
1416         }
1417 }
1418
1419 static void ena_napi_disable_all(struct ena_adapter *adapter)
1420 {
1421         int i;
1422
1423         for (i = 0; i < adapter->num_queues; i++)
1424                 napi_disable(&adapter->ena_napi[i].napi);
1425 }
1426
1427 static void ena_napi_enable_all(struct ena_adapter *adapter)
1428 {
1429         int i;
1430
1431         for (i = 0; i < adapter->num_queues; i++)
1432                 napi_enable(&adapter->ena_napi[i].napi);
1433 }
1434
1435 static void ena_restore_ethtool_params(struct ena_adapter *adapter)
1436 {
1437         adapter->tx_usecs = 0;
1438         adapter->rx_usecs = 0;
1439         adapter->tx_frames = 1;
1440         adapter->rx_frames = 1;
1441 }
1442
1443 /* Configure the Rx forwarding */
1444 static int ena_rss_configure(struct ena_adapter *adapter)
1445 {
1446         struct ena_com_dev *ena_dev = adapter->ena_dev;
1447         int rc;
1448
1449         /* In case the RSS table wasn't initialized by probe */
1450         if (!ena_dev->rss.tbl_log_size) {
1451                 rc = ena_rss_init_default(adapter);
1452                 if (rc && (rc != -EPERM)) {
1453                         netif_err(adapter, ifup, adapter->netdev,
1454                                   "Failed to init RSS rc: %d\n", rc);
1455                         return rc;
1456                 }
1457         }
1458
1459         /* Set indirect table */
1460         rc = ena_com_indirect_table_set(ena_dev);
1461         if (unlikely(rc && rc != -EPERM))
1462                 return rc;
1463
1464         /* Configure hash function (if supported) */
1465         rc = ena_com_set_hash_function(ena_dev);
1466         if (unlikely(rc && (rc != -EPERM)))
1467                 return rc;
1468
1469         /* Configure hash inputs (if supported) */
1470         rc = ena_com_set_hash_ctrl(ena_dev);
1471         if (unlikely(rc && (rc != -EPERM)))
1472                 return rc;
1473
1474         return 0;
1475 }
1476
1477 static int ena_up_complete(struct ena_adapter *adapter)
1478 {
1479         int rc, i;
1480
1481         rc = ena_rss_configure(adapter);
1482         if (rc)
1483                 return rc;
1484
1485         ena_init_napi(adapter);
1486
1487         ena_change_mtu(adapter->netdev, adapter->netdev->mtu);
1488
1489         ena_refill_all_rx_bufs(adapter);
1490
1491         /* enable transmits */
1492         netif_tx_start_all_queues(adapter->netdev);
1493
1494         ena_restore_ethtool_params(adapter);
1495
1496         ena_napi_enable_all(adapter);
1497
1498         /* schedule napi in case we had pending packets
1499          * from the last time we disable napi
1500          */
1501         for (i = 0; i < adapter->num_queues; i++)
1502                 napi_schedule(&adapter->ena_napi[i].napi);
1503
1504         return 0;
1505 }
1506
1507 static int ena_create_io_tx_queue(struct ena_adapter *adapter, int qid)
1508 {
1509         struct ena_com_create_io_ctx ctx = { 0 };
1510         struct ena_com_dev *ena_dev;
1511         struct ena_ring *tx_ring;
1512         u32 msix_vector;
1513         u16 ena_qid;
1514         int rc;
1515
1516         ena_dev = adapter->ena_dev;
1517
1518         tx_ring = &adapter->tx_ring[qid];
1519         msix_vector = ENA_IO_IRQ_IDX(qid);
1520         ena_qid = ENA_IO_TXQ_IDX(qid);
1521
1522         ctx.direction = ENA_COM_IO_QUEUE_DIRECTION_TX;
1523         ctx.qid = ena_qid;
1524         ctx.mem_queue_type = ena_dev->tx_mem_queue_type;
1525         ctx.msix_vector = msix_vector;
1526         ctx.queue_size = adapter->tx_ring_size;
1527         ctx.numa_node = cpu_to_node(tx_ring->cpu);
1528
1529         rc = ena_com_create_io_queue(ena_dev, &ctx);
1530         if (rc) {
1531                 netif_err(adapter, ifup, adapter->netdev,
1532                           "Failed to create I/O TX queue num %d rc: %d\n",
1533                           qid, rc);
1534                 return rc;
1535         }
1536
1537         rc = ena_com_get_io_handlers(ena_dev, ena_qid,
1538                                      &tx_ring->ena_com_io_sq,
1539                                      &tx_ring->ena_com_io_cq);
1540         if (rc) {
1541                 netif_err(adapter, ifup, adapter->netdev,
1542                           "Failed to get TX queue handlers. TX queue num %d rc: %d\n",
1543                           qid, rc);
1544                 ena_com_destroy_io_queue(ena_dev, ena_qid);
1545         }
1546
1547         ena_com_update_numa_node(tx_ring->ena_com_io_cq, ctx.numa_node);
1548         return rc;
1549 }
1550
1551 static int ena_create_all_io_tx_queues(struct ena_adapter *adapter)
1552 {
1553         struct ena_com_dev *ena_dev = adapter->ena_dev;
1554         int rc, i;
1555
1556         for (i = 0; i < adapter->num_queues; i++) {
1557                 rc = ena_create_io_tx_queue(adapter, i);
1558                 if (rc)
1559                         goto create_err;
1560         }
1561
1562         return 0;
1563
1564 create_err:
1565         while (i--)
1566                 ena_com_destroy_io_queue(ena_dev, ENA_IO_TXQ_IDX(i));
1567
1568         return rc;
1569 }
1570
1571 static int ena_create_io_rx_queue(struct ena_adapter *adapter, int qid)
1572 {
1573         struct ena_com_dev *ena_dev;
1574         struct ena_com_create_io_ctx ctx = { 0 };
1575         struct ena_ring *rx_ring;
1576         u32 msix_vector;
1577         u16 ena_qid;
1578         int rc;
1579
1580         ena_dev = adapter->ena_dev;
1581
1582         rx_ring = &adapter->rx_ring[qid];
1583         msix_vector = ENA_IO_IRQ_IDX(qid);
1584         ena_qid = ENA_IO_RXQ_IDX(qid);
1585
1586         ctx.qid = ena_qid;
1587         ctx.direction = ENA_COM_IO_QUEUE_DIRECTION_RX;
1588         ctx.mem_queue_type = ENA_ADMIN_PLACEMENT_POLICY_HOST;
1589         ctx.msix_vector = msix_vector;
1590         ctx.queue_size = adapter->rx_ring_size;
1591         ctx.numa_node = cpu_to_node(rx_ring->cpu);
1592
1593         rc = ena_com_create_io_queue(ena_dev, &ctx);
1594         if (rc) {
1595                 netif_err(adapter, ifup, adapter->netdev,
1596                           "Failed to create I/O RX queue num %d rc: %d\n",
1597                           qid, rc);
1598                 return rc;
1599         }
1600
1601         rc = ena_com_get_io_handlers(ena_dev, ena_qid,
1602                                      &rx_ring->ena_com_io_sq,
1603                                      &rx_ring->ena_com_io_cq);
1604         if (rc) {
1605                 netif_err(adapter, ifup, adapter->netdev,
1606                           "Failed to get RX queue handlers. RX queue num %d rc: %d\n",
1607                           qid, rc);
1608                 ena_com_destroy_io_queue(ena_dev, ena_qid);
1609         }
1610
1611         ena_com_update_numa_node(rx_ring->ena_com_io_cq, ctx.numa_node);
1612
1613         return rc;
1614 }
1615
1616 static int ena_create_all_io_rx_queues(struct ena_adapter *adapter)
1617 {
1618         struct ena_com_dev *ena_dev = adapter->ena_dev;
1619         int rc, i;
1620
1621         for (i = 0; i < adapter->num_queues; i++) {
1622                 rc = ena_create_io_rx_queue(adapter, i);
1623                 if (rc)
1624                         goto create_err;
1625         }
1626
1627         return 0;
1628
1629 create_err:
1630         while (i--)
1631                 ena_com_destroy_io_queue(ena_dev, ENA_IO_RXQ_IDX(i));
1632
1633         return rc;
1634 }
1635
1636 static int ena_up(struct ena_adapter *adapter)
1637 {
1638         int rc;
1639
1640         netdev_dbg(adapter->netdev, "%s\n", __func__);
1641
1642         ena_setup_io_intr(adapter);
1643
1644         rc = ena_request_io_irq(adapter);
1645         if (rc)
1646                 goto err_req_irq;
1647
1648         /* allocate transmit descriptors */
1649         rc = ena_setup_all_tx_resources(adapter);
1650         if (rc)
1651                 goto err_setup_tx;
1652
1653         /* allocate receive descriptors */
1654         rc = ena_setup_all_rx_resources(adapter);
1655         if (rc)
1656                 goto err_setup_rx;
1657
1658         /* Create TX queues */
1659         rc = ena_create_all_io_tx_queues(adapter);
1660         if (rc)
1661                 goto err_create_tx_queues;
1662
1663         /* Create RX queues */
1664         rc = ena_create_all_io_rx_queues(adapter);
1665         if (rc)
1666                 goto err_create_rx_queues;
1667
1668         rc = ena_up_complete(adapter);
1669         if (rc)
1670                 goto err_up;
1671
1672         if (test_bit(ENA_FLAG_LINK_UP, &adapter->flags))
1673                 netif_carrier_on(adapter->netdev);
1674
1675         u64_stats_update_begin(&adapter->syncp);
1676         adapter->dev_stats.interface_up++;
1677         u64_stats_update_end(&adapter->syncp);
1678
1679         set_bit(ENA_FLAG_DEV_UP, &adapter->flags);
1680
1681         return rc;
1682
1683 err_up:
1684         ena_destroy_all_rx_queues(adapter);
1685 err_create_rx_queues:
1686         ena_destroy_all_tx_queues(adapter);
1687 err_create_tx_queues:
1688         ena_free_all_io_rx_resources(adapter);
1689 err_setup_rx:
1690         ena_free_all_io_tx_resources(adapter);
1691 err_setup_tx:
1692         ena_free_io_irq(adapter);
1693 err_req_irq:
1694
1695         return rc;
1696 }
1697
1698 static void ena_down(struct ena_adapter *adapter)
1699 {
1700         netif_info(adapter, ifdown, adapter->netdev, "%s\n", __func__);
1701
1702         clear_bit(ENA_FLAG_DEV_UP, &adapter->flags);
1703
1704         u64_stats_update_begin(&adapter->syncp);
1705         adapter->dev_stats.interface_down++;
1706         u64_stats_update_end(&adapter->syncp);
1707
1708         /* After this point the napi handler won't enable the tx queue */
1709         ena_napi_disable_all(adapter);
1710         netif_carrier_off(adapter->netdev);
1711         netif_tx_disable(adapter->netdev);
1712
1713         /* After destroy the queue there won't be any new interrupts */
1714         ena_destroy_all_io_queues(adapter);
1715
1716         ena_disable_io_intr_sync(adapter);
1717         ena_free_io_irq(adapter);
1718         ena_del_napi(adapter);
1719
1720         ena_free_all_tx_bufs(adapter);
1721         ena_free_all_rx_bufs(adapter);
1722         ena_free_all_io_tx_resources(adapter);
1723         ena_free_all_io_rx_resources(adapter);
1724 }
1725
1726 /* ena_open - Called when a network interface is made active
1727  * @netdev: network interface device structure
1728  *
1729  * Returns 0 on success, negative value on failure
1730  *
1731  * The open entry point is called when a network interface is made
1732  * active by the system (IFF_UP).  At this point all resources needed
1733  * for transmit and receive operations are allocated, the interrupt
1734  * handler is registered with the OS, the watchdog timer is started,
1735  * and the stack is notified that the interface is ready.
1736  */
1737 static int ena_open(struct net_device *netdev)
1738 {
1739         struct ena_adapter *adapter = netdev_priv(netdev);
1740         int rc;
1741
1742         /* Notify the stack of the actual queue counts. */
1743         rc = netif_set_real_num_tx_queues(netdev, adapter->num_queues);
1744         if (rc) {
1745                 netif_err(adapter, ifup, netdev, "Can't set num tx queues\n");
1746                 return rc;
1747         }
1748
1749         rc = netif_set_real_num_rx_queues(netdev, adapter->num_queues);
1750         if (rc) {
1751                 netif_err(adapter, ifup, netdev, "Can't set num rx queues\n");
1752                 return rc;
1753         }
1754
1755         rc = ena_up(adapter);
1756         if (rc)
1757                 return rc;
1758
1759         return rc;
1760 }
1761
1762 /* ena_close - Disables a network interface
1763  * @netdev: network interface device structure
1764  *
1765  * Returns 0, this is not allowed to fail
1766  *
1767  * The close entry point is called when an interface is de-activated
1768  * by the OS.  The hardware is still under the drivers control, but
1769  * needs to be disabled.  A global MAC reset is issued to stop the
1770  * hardware, and all transmit and receive resources are freed.
1771  */
1772 static int ena_close(struct net_device *netdev)
1773 {
1774         struct ena_adapter *adapter = netdev_priv(netdev);
1775
1776         netif_dbg(adapter, ifdown, netdev, "%s\n", __func__);
1777
1778         if (test_bit(ENA_FLAG_DEV_UP, &adapter->flags))
1779                 ena_down(adapter);
1780
1781         return 0;
1782 }
1783
1784 static void ena_tx_csum(struct ena_com_tx_ctx *ena_tx_ctx, struct sk_buff *skb)
1785 {
1786         u32 mss = skb_shinfo(skb)->gso_size;
1787         struct ena_com_tx_meta *ena_meta = &ena_tx_ctx->ena_meta;
1788         u8 l4_protocol = 0;
1789
1790         if ((skb->ip_summed == CHECKSUM_PARTIAL) || mss) {
1791                 ena_tx_ctx->l4_csum_enable = 1;
1792                 if (mss) {
1793                         ena_tx_ctx->tso_enable = 1;
1794                         ena_meta->l4_hdr_len = tcp_hdr(skb)->doff;
1795                         ena_tx_ctx->l4_csum_partial = 0;
1796                 } else {
1797                         ena_tx_ctx->tso_enable = 0;
1798                         ena_meta->l4_hdr_len = 0;
1799                         ena_tx_ctx->l4_csum_partial = 1;
1800                 }
1801
1802                 switch (ip_hdr(skb)->version) {
1803                 case IPVERSION:
1804                         ena_tx_ctx->l3_proto = ENA_ETH_IO_L3_PROTO_IPV4;
1805                         if (ip_hdr(skb)->frag_off & htons(IP_DF))
1806                                 ena_tx_ctx->df = 1;
1807                         if (mss)
1808                                 ena_tx_ctx->l3_csum_enable = 1;
1809                         l4_protocol = ip_hdr(skb)->protocol;
1810                         break;
1811                 case 6:
1812                         ena_tx_ctx->l3_proto = ENA_ETH_IO_L3_PROTO_IPV6;
1813                         l4_protocol = ipv6_hdr(skb)->nexthdr;
1814                         break;
1815                 default:
1816                         break;
1817                 }
1818
1819                 if (l4_protocol == IPPROTO_TCP)
1820                         ena_tx_ctx->l4_proto = ENA_ETH_IO_L4_PROTO_TCP;
1821                 else
1822                         ena_tx_ctx->l4_proto = ENA_ETH_IO_L4_PROTO_UDP;
1823
1824                 ena_meta->mss = mss;
1825                 ena_meta->l3_hdr_len = skb_network_header_len(skb);
1826                 ena_meta->l3_hdr_offset = skb_network_offset(skb);
1827                 ena_tx_ctx->meta_valid = 1;
1828
1829         } else {
1830                 ena_tx_ctx->meta_valid = 0;
1831         }
1832 }
1833
1834 static int ena_check_and_linearize_skb(struct ena_ring *tx_ring,
1835                                        struct sk_buff *skb)
1836 {
1837         int num_frags, header_len, rc;
1838
1839         num_frags = skb_shinfo(skb)->nr_frags;
1840         header_len = skb_headlen(skb);
1841
1842         if (num_frags < tx_ring->sgl_size)
1843                 return 0;
1844
1845         if ((num_frags == tx_ring->sgl_size) &&
1846             (header_len < tx_ring->tx_max_header_size))
1847                 return 0;
1848
1849         u64_stats_update_begin(&tx_ring->syncp);
1850         tx_ring->tx_stats.linearize++;
1851         u64_stats_update_end(&tx_ring->syncp);
1852
1853         rc = skb_linearize(skb);
1854         if (unlikely(rc)) {
1855                 u64_stats_update_begin(&tx_ring->syncp);
1856                 tx_ring->tx_stats.linearize_failed++;
1857                 u64_stats_update_end(&tx_ring->syncp);
1858         }
1859
1860         return rc;
1861 }
1862
1863 /* Called with netif_tx_lock. */
1864 static netdev_tx_t ena_start_xmit(struct sk_buff *skb, struct net_device *dev)
1865 {
1866         struct ena_adapter *adapter = netdev_priv(dev);
1867         struct ena_tx_buffer *tx_info;
1868         struct ena_com_tx_ctx ena_tx_ctx;
1869         struct ena_ring *tx_ring;
1870         struct netdev_queue *txq;
1871         struct ena_com_buf *ena_buf;
1872         void *push_hdr;
1873         u32 len, last_frag;
1874         u16 next_to_use;
1875         u16 req_id;
1876         u16 push_len;
1877         u16 header_len;
1878         dma_addr_t dma;
1879         int qid, rc, nb_hw_desc;
1880         int i = -1;
1881
1882         netif_dbg(adapter, tx_queued, dev, "%s skb %p\n", __func__, skb);
1883         /*  Determine which tx ring we will be placed on */
1884         qid = skb_get_queue_mapping(skb);
1885         tx_ring = &adapter->tx_ring[qid];
1886         txq = netdev_get_tx_queue(dev, qid);
1887
1888         rc = ena_check_and_linearize_skb(tx_ring, skb);
1889         if (unlikely(rc))
1890                 goto error_drop_packet;
1891
1892         skb_tx_timestamp(skb);
1893         len = skb_headlen(skb);
1894
1895         next_to_use = tx_ring->next_to_use;
1896         req_id = tx_ring->free_tx_ids[next_to_use];
1897         tx_info = &tx_ring->tx_buffer_info[req_id];
1898         tx_info->num_of_bufs = 0;
1899
1900         WARN(tx_info->skb, "SKB isn't NULL req_id %d\n", req_id);
1901         ena_buf = tx_info->bufs;
1902         tx_info->skb = skb;
1903
1904         if (tx_ring->tx_mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV) {
1905                 /* prepared the push buffer */
1906                 push_len = min_t(u32, len, tx_ring->tx_max_header_size);
1907                 header_len = push_len;
1908                 push_hdr = skb->data;
1909         } else {
1910                 push_len = 0;
1911                 header_len = min_t(u32, len, tx_ring->tx_max_header_size);
1912                 push_hdr = NULL;
1913         }
1914
1915         netif_dbg(adapter, tx_queued, dev,
1916                   "skb: %p header_buf->vaddr: %p push_len: %d\n", skb,
1917                   push_hdr, push_len);
1918
1919         if (len > push_len) {
1920                 dma = dma_map_single(tx_ring->dev, skb->data + push_len,
1921                                      len - push_len, DMA_TO_DEVICE);
1922                 if (dma_mapping_error(tx_ring->dev, dma))
1923                         goto error_report_dma_error;
1924
1925                 ena_buf->paddr = dma;
1926                 ena_buf->len = len - push_len;
1927
1928                 ena_buf++;
1929                 tx_info->num_of_bufs++;
1930         }
1931
1932         last_frag = skb_shinfo(skb)->nr_frags;
1933
1934         for (i = 0; i < last_frag; i++) {
1935                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1936
1937                 len = skb_frag_size(frag);
1938                 dma = skb_frag_dma_map(tx_ring->dev, frag, 0, len,
1939                                        DMA_TO_DEVICE);
1940                 if (dma_mapping_error(tx_ring->dev, dma))
1941                         goto error_report_dma_error;
1942
1943                 ena_buf->paddr = dma;
1944                 ena_buf->len = len;
1945                 ena_buf++;
1946         }
1947
1948         tx_info->num_of_bufs += last_frag;
1949
1950         memset(&ena_tx_ctx, 0x0, sizeof(struct ena_com_tx_ctx));
1951         ena_tx_ctx.ena_bufs = tx_info->bufs;
1952         ena_tx_ctx.push_header = push_hdr;
1953         ena_tx_ctx.num_bufs = tx_info->num_of_bufs;
1954         ena_tx_ctx.req_id = req_id;
1955         ena_tx_ctx.header_len = header_len;
1956
1957         /* set flags and meta data */
1958         ena_tx_csum(&ena_tx_ctx, skb);
1959
1960         /* prepare the packet's descriptors to dma engine */
1961         rc = ena_com_prepare_tx(tx_ring->ena_com_io_sq, &ena_tx_ctx,
1962                                 &nb_hw_desc);
1963
1964         if (unlikely(rc)) {
1965                 netif_err(adapter, tx_queued, dev,
1966                           "failed to prepare tx bufs\n");
1967                 u64_stats_update_begin(&tx_ring->syncp);
1968                 tx_ring->tx_stats.queue_stop++;
1969                 tx_ring->tx_stats.prepare_ctx_err++;
1970                 u64_stats_update_end(&tx_ring->syncp);
1971                 netif_tx_stop_queue(txq);
1972                 goto error_unmap_dma;
1973         }
1974
1975         netdev_tx_sent_queue(txq, skb->len);
1976
1977         u64_stats_update_begin(&tx_ring->syncp);
1978         tx_ring->tx_stats.cnt++;
1979         tx_ring->tx_stats.bytes += skb->len;
1980         u64_stats_update_end(&tx_ring->syncp);
1981
1982         tx_info->tx_descs = nb_hw_desc;
1983         tx_info->last_jiffies = jiffies;
1984
1985         tx_ring->next_to_use = ENA_TX_RING_IDX_NEXT(next_to_use,
1986                 tx_ring->ring_size);
1987
1988         /* This WMB is aimed to:
1989          * 1 - perform smp barrier before reading next_to_completion
1990          * 2 - make sure the desc were written before trigger DB
1991          */
1992         wmb();
1993
1994         /* stop the queue when no more space available, the packet can have up
1995          * to sgl_size + 2. one for the meta descriptor and one for header
1996          * (if the header is larger than tx_max_header_size).
1997          */
1998         if (unlikely(ena_com_sq_empty_space(tx_ring->ena_com_io_sq) <
1999                      (tx_ring->sgl_size + 2))) {
2000                 netif_dbg(adapter, tx_queued, dev, "%s stop queue %d\n",
2001                           __func__, qid);
2002
2003                 netif_tx_stop_queue(txq);
2004                 u64_stats_update_begin(&tx_ring->syncp);
2005                 tx_ring->tx_stats.queue_stop++;
2006                 u64_stats_update_end(&tx_ring->syncp);
2007
2008                 /* There is a rare condition where this function decide to
2009                  * stop the queue but meanwhile clean_tx_irq updates
2010                  * next_to_completion and terminates.
2011                  * The queue will remain stopped forever.
2012                  * To solve this issue this function perform rmb, check
2013                  * the wakeup condition and wake up the queue if needed.
2014                  */
2015                 smp_rmb();
2016
2017                 if (ena_com_sq_empty_space(tx_ring->ena_com_io_sq)
2018                                 > ENA_TX_WAKEUP_THRESH) {
2019                         netif_tx_wake_queue(txq);
2020                         u64_stats_update_begin(&tx_ring->syncp);
2021                         tx_ring->tx_stats.queue_wakeup++;
2022                         u64_stats_update_end(&tx_ring->syncp);
2023                 }
2024         }
2025
2026         if (netif_xmit_stopped(txq) || !skb->xmit_more) {
2027                 /* trigger the dma engine */
2028                 ena_com_write_sq_doorbell(tx_ring->ena_com_io_sq);
2029                 u64_stats_update_begin(&tx_ring->syncp);
2030                 tx_ring->tx_stats.doorbells++;
2031                 u64_stats_update_end(&tx_ring->syncp);
2032         }
2033
2034         return NETDEV_TX_OK;
2035
2036 error_report_dma_error:
2037         u64_stats_update_begin(&tx_ring->syncp);
2038         tx_ring->tx_stats.dma_mapping_err++;
2039         u64_stats_update_end(&tx_ring->syncp);
2040         netdev_warn(adapter->netdev, "failed to map skb\n");
2041
2042         tx_info->skb = NULL;
2043
2044 error_unmap_dma:
2045         if (i >= 0) {
2046                 /* save value of frag that failed */
2047                 last_frag = i;
2048
2049                 /* start back at beginning and unmap skb */
2050                 tx_info->skb = NULL;
2051                 ena_buf = tx_info->bufs;
2052                 dma_unmap_single(tx_ring->dev, dma_unmap_addr(ena_buf, paddr),
2053                                  dma_unmap_len(ena_buf, len), DMA_TO_DEVICE);
2054
2055                 /* unmap remaining mapped pages */
2056                 for (i = 0; i < last_frag; i++) {
2057                         ena_buf++;
2058                         dma_unmap_page(tx_ring->dev, dma_unmap_addr(ena_buf, paddr),
2059                                        dma_unmap_len(ena_buf, len), DMA_TO_DEVICE);
2060                 }
2061         }
2062
2063 error_drop_packet:
2064
2065         dev_kfree_skb(skb);
2066         return NETDEV_TX_OK;
2067 }
2068
2069 #ifdef CONFIG_NET_POLL_CONTROLLER
2070 static void ena_netpoll(struct net_device *netdev)
2071 {
2072         struct ena_adapter *adapter = netdev_priv(netdev);
2073         int i;
2074
2075         for (i = 0; i < adapter->num_queues; i++)
2076                 napi_schedule(&adapter->ena_napi[i].napi);
2077 }
2078 #endif /* CONFIG_NET_POLL_CONTROLLER */
2079
2080 static u16 ena_select_queue(struct net_device *dev, struct sk_buff *skb,
2081                             void *accel_priv, select_queue_fallback_t fallback)
2082 {
2083         u16 qid;
2084         /* we suspect that this is good for in--kernel network services that
2085          * want to loop incoming skb rx to tx in normal user generated traffic,
2086          * most probably we will not get to this
2087          */
2088         if (skb_rx_queue_recorded(skb))
2089                 qid = skb_get_rx_queue(skb);
2090         else
2091                 qid = fallback(dev, skb);
2092
2093         return qid;
2094 }
2095
2096 static void ena_config_host_info(struct ena_com_dev *ena_dev)
2097 {
2098         struct ena_admin_host_info *host_info;
2099         int rc;
2100
2101         /* Allocate only the host info */
2102         rc = ena_com_allocate_host_info(ena_dev);
2103         if (rc) {
2104                 pr_err("Cannot allocate host info\n");
2105                 return;
2106         }
2107
2108         host_info = ena_dev->host_attr.host_info;
2109
2110         host_info->os_type = ENA_ADMIN_OS_LINUX;
2111         host_info->kernel_ver = LINUX_VERSION_CODE;
2112         strncpy(host_info->kernel_ver_str, utsname()->version,
2113                 sizeof(host_info->kernel_ver_str) - 1);
2114         host_info->os_dist = 0;
2115         strncpy(host_info->os_dist_str, utsname()->release,
2116                 sizeof(host_info->os_dist_str) - 1);
2117         host_info->driver_version =
2118                 (DRV_MODULE_VER_MAJOR) |
2119                 (DRV_MODULE_VER_MINOR << ENA_ADMIN_HOST_INFO_MINOR_SHIFT) |
2120                 (DRV_MODULE_VER_SUBMINOR << ENA_ADMIN_HOST_INFO_SUB_MINOR_SHIFT);
2121
2122         rc = ena_com_set_host_attributes(ena_dev);
2123         if (rc) {
2124                 if (rc == -EPERM)
2125                         pr_warn("Cannot set host attributes\n");
2126                 else
2127                         pr_err("Cannot set host attributes\n");
2128
2129                 goto err;
2130         }
2131
2132         return;
2133
2134 err:
2135         ena_com_delete_host_info(ena_dev);
2136 }
2137
2138 static void ena_config_debug_area(struct ena_adapter *adapter)
2139 {
2140         u32 debug_area_size;
2141         int rc, ss_count;
2142
2143         ss_count = ena_get_sset_count(adapter->netdev, ETH_SS_STATS);
2144         if (ss_count <= 0) {
2145                 netif_err(adapter, drv, adapter->netdev,
2146                           "SS count is negative\n");
2147                 return;
2148         }
2149
2150         /* allocate 32 bytes for each string and 64bit for the value */
2151         debug_area_size = ss_count * ETH_GSTRING_LEN + sizeof(u64) * ss_count;
2152
2153         rc = ena_com_allocate_debug_area(adapter->ena_dev, debug_area_size);
2154         if (rc) {
2155                 pr_err("Cannot allocate debug area\n");
2156                 return;
2157         }
2158
2159         rc = ena_com_set_host_attributes(adapter->ena_dev);
2160         if (rc) {
2161                 if (rc == -EPERM)
2162                         netif_warn(adapter, drv, adapter->netdev,
2163                                    "Cannot set host attributes\n");
2164                 else
2165                         netif_err(adapter, drv, adapter->netdev,
2166                                   "Cannot set host attributes\n");
2167                 goto err;
2168         }
2169
2170         return;
2171 err:
2172         ena_com_delete_debug_area(adapter->ena_dev);
2173 }
2174
2175 static struct rtnl_link_stats64 *ena_get_stats64(struct net_device *netdev,
2176                                                  struct rtnl_link_stats64 *stats)
2177 {
2178         struct ena_adapter *adapter = netdev_priv(netdev);
2179         struct ena_admin_basic_stats ena_stats;
2180         int rc;
2181
2182         if (!test_bit(ENA_FLAG_DEV_UP, &adapter->flags))
2183                 return NULL;
2184
2185         rc = ena_com_get_dev_basic_stats(adapter->ena_dev, &ena_stats);
2186         if (rc)
2187                 return NULL;
2188
2189         stats->tx_bytes = ((u64)ena_stats.tx_bytes_high << 32) |
2190                 ena_stats.tx_bytes_low;
2191         stats->rx_bytes = ((u64)ena_stats.rx_bytes_high << 32) |
2192                 ena_stats.rx_bytes_low;
2193
2194         stats->rx_packets = ((u64)ena_stats.rx_pkts_high << 32) |
2195                 ena_stats.rx_pkts_low;
2196         stats->tx_packets = ((u64)ena_stats.tx_pkts_high << 32) |
2197                 ena_stats.tx_pkts_low;
2198
2199         stats->rx_dropped = ((u64)ena_stats.rx_drops_high << 32) |
2200                 ena_stats.rx_drops_low;
2201
2202         stats->multicast = 0;
2203         stats->collisions = 0;
2204
2205         stats->rx_length_errors = 0;
2206         stats->rx_crc_errors = 0;
2207         stats->rx_frame_errors = 0;
2208         stats->rx_fifo_errors = 0;
2209         stats->rx_missed_errors = 0;
2210         stats->tx_window_errors = 0;
2211
2212         stats->rx_errors = 0;
2213         stats->tx_errors = 0;
2214
2215         return stats;
2216 }
2217
2218 static const struct net_device_ops ena_netdev_ops = {
2219         .ndo_open               = ena_open,
2220         .ndo_stop               = ena_close,
2221         .ndo_start_xmit         = ena_start_xmit,
2222         .ndo_select_queue       = ena_select_queue,
2223         .ndo_get_stats64        = ena_get_stats64,
2224         .ndo_tx_timeout         = ena_tx_timeout,
2225         .ndo_change_mtu         = ena_change_mtu,
2226         .ndo_set_mac_address    = NULL,
2227         .ndo_validate_addr      = eth_validate_addr,
2228 #ifdef CONFIG_NET_POLL_CONTROLLER
2229         .ndo_poll_controller    = ena_netpoll,
2230 #endif /* CONFIG_NET_POLL_CONTROLLER */
2231 };
2232
2233 static void ena_device_io_suspend(struct work_struct *work)
2234 {
2235         struct ena_adapter *adapter =
2236                 container_of(work, struct ena_adapter, suspend_io_task);
2237         struct net_device *netdev = adapter->netdev;
2238
2239         /* ena_napi_disable_all disables only the IO handling.
2240          * We are still subject to AENQ keep alive watchdog.
2241          */
2242         u64_stats_update_begin(&adapter->syncp);
2243         adapter->dev_stats.io_suspend++;
2244         u64_stats_update_begin(&adapter->syncp);
2245         ena_napi_disable_all(adapter);
2246         netif_tx_lock(netdev);
2247         netif_device_detach(netdev);
2248         netif_tx_unlock(netdev);
2249 }
2250
2251 static void ena_device_io_resume(struct work_struct *work)
2252 {
2253         struct ena_adapter *adapter =
2254                 container_of(work, struct ena_adapter, resume_io_task);
2255         struct net_device *netdev = adapter->netdev;
2256
2257         u64_stats_update_begin(&adapter->syncp);
2258         adapter->dev_stats.io_resume++;
2259         u64_stats_update_end(&adapter->syncp);
2260
2261         netif_device_attach(netdev);
2262         ena_napi_enable_all(adapter);
2263 }
2264
2265 static int ena_device_validate_params(struct ena_adapter *adapter,
2266                                       struct ena_com_dev_get_features_ctx *get_feat_ctx)
2267 {
2268         struct net_device *netdev = adapter->netdev;
2269         int rc;
2270
2271         rc = ether_addr_equal(get_feat_ctx->dev_attr.mac_addr,
2272                               adapter->mac_addr);
2273         if (!rc) {
2274                 netif_err(adapter, drv, netdev,
2275                           "Error, mac address are different\n");
2276                 return -EINVAL;
2277         }
2278
2279         if ((get_feat_ctx->max_queues.max_cq_num < adapter->num_queues) ||
2280             (get_feat_ctx->max_queues.max_sq_num < adapter->num_queues)) {
2281                 netif_err(adapter, drv, netdev,
2282                           "Error, device doesn't support enough queues\n");
2283                 return -EINVAL;
2284         }
2285
2286         if (get_feat_ctx->dev_attr.max_mtu < netdev->mtu) {
2287                 netif_err(adapter, drv, netdev,
2288                           "Error, device max mtu is smaller than netdev MTU\n");
2289                 return -EINVAL;
2290         }
2291
2292         return 0;
2293 }
2294
2295 static int ena_device_init(struct ena_com_dev *ena_dev, struct pci_dev *pdev,
2296                            struct ena_com_dev_get_features_ctx *get_feat_ctx,
2297                            bool *wd_state)
2298 {
2299         struct device *dev = &pdev->dev;
2300         bool readless_supported;
2301         u32 aenq_groups;
2302         int dma_width;
2303         int rc;
2304
2305         rc = ena_com_mmio_reg_read_request_init(ena_dev);
2306         if (rc) {
2307                 dev_err(dev, "failed to init mmio read less\n");
2308                 return rc;
2309         }
2310
2311         /* The PCIe configuration space revision id indicate if mmio reg
2312          * read is disabled
2313          */
2314         readless_supported = !(pdev->revision & ENA_MMIO_DISABLE_REG_READ);
2315         ena_com_set_mmio_read_mode(ena_dev, readless_supported);
2316
2317         rc = ena_com_dev_reset(ena_dev);
2318         if (rc) {
2319                 dev_err(dev, "Can not reset device\n");
2320                 goto err_mmio_read_less;
2321         }
2322
2323         rc = ena_com_validate_version(ena_dev);
2324         if (rc) {
2325                 dev_err(dev, "device version is too low\n");
2326                 goto err_mmio_read_less;
2327         }
2328
2329         dma_width = ena_com_get_dma_width(ena_dev);
2330         if (dma_width < 0) {
2331                 dev_err(dev, "Invalid dma width value %d", dma_width);
2332                 goto err_mmio_read_less;
2333         }
2334
2335         rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(dma_width));
2336         if (rc) {
2337                 dev_err(dev, "pci_set_dma_mask failed 0x%x\n", rc);
2338                 goto err_mmio_read_less;
2339         }
2340
2341         rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(dma_width));
2342         if (rc) {
2343                 dev_err(dev, "err_pci_set_consistent_dma_mask failed 0x%x\n",
2344                         rc);
2345                 goto err_mmio_read_less;
2346         }
2347
2348         /* ENA admin level init */
2349         rc = ena_com_admin_init(ena_dev, &aenq_handlers, true);
2350         if (rc) {
2351                 dev_err(dev,
2352                         "Can not initialize ena admin queue with device\n");
2353                 goto err_mmio_read_less;
2354         }
2355
2356         /* To enable the msix interrupts the driver needs to know the number
2357          * of queues. So the driver uses polling mode to retrieve this
2358          * information
2359          */
2360         ena_com_set_admin_polling_mode(ena_dev, true);
2361
2362         /* Get Device Attributes*/
2363         rc = ena_com_get_dev_attr_feat(ena_dev, get_feat_ctx);
2364         if (rc) {
2365                 dev_err(dev, "Cannot get attribute for ena device rc=%d\n", rc);
2366                 goto err_admin_init;
2367         }
2368
2369         /* Try to turn all the available aenq groups */
2370         aenq_groups = BIT(ENA_ADMIN_LINK_CHANGE) |
2371                 BIT(ENA_ADMIN_FATAL_ERROR) |
2372                 BIT(ENA_ADMIN_WARNING) |
2373                 BIT(ENA_ADMIN_NOTIFICATION) |
2374                 BIT(ENA_ADMIN_KEEP_ALIVE);
2375
2376         aenq_groups &= get_feat_ctx->aenq.supported_groups;
2377
2378         rc = ena_com_set_aenq_config(ena_dev, aenq_groups);
2379         if (rc) {
2380                 dev_err(dev, "Cannot configure aenq groups rc= %d\n", rc);
2381                 goto err_admin_init;
2382         }
2383
2384         *wd_state = !!(aenq_groups & BIT(ENA_ADMIN_KEEP_ALIVE));
2385
2386         ena_config_host_info(ena_dev);
2387
2388         return 0;
2389
2390 err_admin_init:
2391         ena_com_admin_destroy(ena_dev);
2392 err_mmio_read_less:
2393         ena_com_mmio_reg_read_request_destroy(ena_dev);
2394
2395         return rc;
2396 }
2397
2398 static int ena_enable_msix_and_set_admin_interrupts(struct ena_adapter *adapter,
2399                                                     int io_vectors)
2400 {
2401         struct ena_com_dev *ena_dev = adapter->ena_dev;
2402         struct device *dev = &adapter->pdev->dev;
2403         int rc;
2404
2405         rc = ena_enable_msix(adapter, io_vectors);
2406         if (rc) {
2407                 dev_err(dev, "Can not reserve msix vectors\n");
2408                 return rc;
2409         }
2410
2411         ena_setup_mgmnt_intr(adapter);
2412
2413         rc = ena_request_mgmnt_irq(adapter);
2414         if (rc) {
2415                 dev_err(dev, "Can not setup management interrupts\n");
2416                 goto err_disable_msix;
2417         }
2418
2419         ena_com_set_admin_polling_mode(ena_dev, false);
2420
2421         ena_com_admin_aenq_enable(ena_dev);
2422
2423         return 0;
2424
2425 err_disable_msix:
2426         ena_disable_msix(adapter);
2427
2428         return rc;
2429 }
2430
2431 static void ena_fw_reset_device(struct work_struct *work)
2432 {
2433         struct ena_com_dev_get_features_ctx get_feat_ctx;
2434         struct ena_adapter *adapter =
2435                 container_of(work, struct ena_adapter, reset_task);
2436         struct net_device *netdev = adapter->netdev;
2437         struct ena_com_dev *ena_dev = adapter->ena_dev;
2438         struct pci_dev *pdev = adapter->pdev;
2439         bool dev_up, wd_state;
2440         int rc;
2441
2442         del_timer_sync(&adapter->timer_service);
2443
2444         rtnl_lock();
2445
2446         dev_up = test_bit(ENA_FLAG_DEV_UP, &adapter->flags);
2447         ena_com_set_admin_running_state(ena_dev, false);
2448
2449         /* After calling ena_close the tx queues and the napi
2450          * are disabled so no one can interfere or touch the
2451          * data structures
2452          */
2453         ena_close(netdev);
2454
2455         rc = ena_com_dev_reset(ena_dev);
2456         if (rc) {
2457                 dev_err(&pdev->dev, "Device reset failed\n");
2458                 goto err;
2459         }
2460
2461         ena_free_mgmnt_irq(adapter);
2462
2463         ena_disable_msix(adapter);
2464
2465         ena_com_abort_admin_commands(ena_dev);
2466
2467         ena_com_wait_for_abort_completion(ena_dev);
2468
2469         ena_com_admin_destroy(ena_dev);
2470
2471         ena_com_mmio_reg_read_request_destroy(ena_dev);
2472
2473         /* Finish with the destroy part. Start the init part */
2474
2475         rc = ena_device_init(ena_dev, adapter->pdev, &get_feat_ctx, &wd_state);
2476         if (rc) {
2477                 dev_err(&pdev->dev, "Can not initialize device\n");
2478                 goto err;
2479         }
2480         adapter->wd_state = wd_state;
2481
2482         rc = ena_device_validate_params(adapter, &get_feat_ctx);
2483         if (rc) {
2484                 dev_err(&pdev->dev, "Validation of device parameters failed\n");
2485                 goto err_device_destroy;
2486         }
2487
2488         rc = ena_enable_msix_and_set_admin_interrupts(adapter,
2489                                                       adapter->num_queues);
2490         if (rc) {
2491                 dev_err(&pdev->dev, "Enable MSI-X failed\n");
2492                 goto err_device_destroy;
2493         }
2494         /* If the interface was up before the reset bring it up */
2495         if (dev_up) {
2496                 rc = ena_up(adapter);
2497                 if (rc) {
2498                         dev_err(&pdev->dev, "Failed to create I/O queues\n");
2499                         goto err_disable_msix;
2500                 }
2501         }
2502
2503         mod_timer(&adapter->timer_service, round_jiffies(jiffies + HZ));
2504
2505         rtnl_unlock();
2506
2507         dev_err(&pdev->dev, "Device reset completed successfully\n");
2508
2509         return;
2510 err_disable_msix:
2511         ena_free_mgmnt_irq(adapter);
2512         ena_disable_msix(adapter);
2513 err_device_destroy:
2514         ena_com_admin_destroy(ena_dev);
2515 err:
2516         rtnl_unlock();
2517
2518         dev_err(&pdev->dev,
2519                 "Reset attempt failed. Can not reset the device\n");
2520 }
2521
2522 static void check_for_missing_tx_completions(struct ena_adapter *adapter)
2523 {
2524         struct ena_tx_buffer *tx_buf;
2525         unsigned long last_jiffies;
2526         struct ena_ring *tx_ring;
2527         int i, j, budget;
2528         u32 missed_tx;
2529
2530         /* Make sure the driver doesn't turn the device in other process */
2531         smp_rmb();
2532
2533         if (!test_bit(ENA_FLAG_DEV_UP, &adapter->flags))
2534                 return;
2535
2536         budget = ENA_MONITORED_TX_QUEUES;
2537
2538         for (i = adapter->last_monitored_tx_qid; i < adapter->num_queues; i++) {
2539                 tx_ring = &adapter->tx_ring[i];
2540
2541                 for (j = 0; j < tx_ring->ring_size; j++) {
2542                         tx_buf = &tx_ring->tx_buffer_info[j];
2543                         last_jiffies = tx_buf->last_jiffies;
2544                         if (unlikely(last_jiffies && time_is_before_jiffies(last_jiffies + TX_TIMEOUT))) {
2545                                 netif_notice(adapter, tx_err, adapter->netdev,
2546                                              "Found a Tx that wasn't completed on time, qid %d, index %d.\n",
2547                                              tx_ring->qid, j);
2548
2549                                 u64_stats_update_begin(&tx_ring->syncp);
2550                                 missed_tx = tx_ring->tx_stats.missing_tx_comp++;
2551                                 u64_stats_update_end(&tx_ring->syncp);
2552
2553                                 /* Clear last jiffies so the lost buffer won't
2554                                  * be counted twice.
2555                                  */
2556                                 tx_buf->last_jiffies = 0;
2557
2558                                 if (unlikely(missed_tx > MAX_NUM_OF_TIMEOUTED_PACKETS)) {
2559                                         netif_err(adapter, tx_err, adapter->netdev,
2560                                                   "The number of lost tx completion is above the threshold (%d > %d). Reset the device\n",
2561                                                   missed_tx, MAX_NUM_OF_TIMEOUTED_PACKETS);
2562                                         set_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags);
2563                                 }
2564                         }
2565                 }
2566
2567                 budget--;
2568                 if (!budget)
2569                         break;
2570         }
2571
2572         adapter->last_monitored_tx_qid = i % adapter->num_queues;
2573 }
2574
2575 /* Check for keep alive expiration */
2576 static void check_for_missing_keep_alive(struct ena_adapter *adapter)
2577 {
2578         unsigned long keep_alive_expired;
2579
2580         if (!adapter->wd_state)
2581                 return;
2582
2583         keep_alive_expired = round_jiffies(adapter->last_keep_alive_jiffies
2584                                            + ENA_DEVICE_KALIVE_TIMEOUT);
2585         if (unlikely(time_is_before_jiffies(keep_alive_expired))) {
2586                 netif_err(adapter, drv, adapter->netdev,
2587                           "Keep alive watchdog timeout.\n");
2588                 u64_stats_update_begin(&adapter->syncp);
2589                 adapter->dev_stats.wd_expired++;
2590                 u64_stats_update_end(&adapter->syncp);
2591                 set_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags);
2592         }
2593 }
2594
2595 static void check_for_admin_com_state(struct ena_adapter *adapter)
2596 {
2597         if (unlikely(!ena_com_get_admin_running_state(adapter->ena_dev))) {
2598                 netif_err(adapter, drv, adapter->netdev,
2599                           "ENA admin queue is not in running state!\n");
2600                 u64_stats_update_begin(&adapter->syncp);
2601                 adapter->dev_stats.admin_q_pause++;
2602                 u64_stats_update_end(&adapter->syncp);
2603                 set_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags);
2604         }
2605 }
2606
2607 static void ena_update_host_info(struct ena_admin_host_info *host_info,
2608                                  struct net_device *netdev)
2609 {
2610         host_info->supported_network_features[0] =
2611                 netdev->features & GENMASK_ULL(31, 0);
2612         host_info->supported_network_features[1] =
2613                 (netdev->features & GENMASK_ULL(63, 32)) >> 32;
2614 }
2615
2616 static void ena_timer_service(unsigned long data)
2617 {
2618         struct ena_adapter *adapter = (struct ena_adapter *)data;
2619         u8 *debug_area = adapter->ena_dev->host_attr.debug_area_virt_addr;
2620         struct ena_admin_host_info *host_info =
2621                 adapter->ena_dev->host_attr.host_info;
2622
2623         check_for_missing_keep_alive(adapter);
2624
2625         check_for_admin_com_state(adapter);
2626
2627         check_for_missing_tx_completions(adapter);
2628
2629         if (debug_area)
2630                 ena_dump_stats_to_buf(adapter, debug_area);
2631
2632         if (host_info)
2633                 ena_update_host_info(host_info, adapter->netdev);
2634
2635         if (unlikely(test_and_clear_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags))) {
2636                 netif_err(adapter, drv, adapter->netdev,
2637                           "Trigger reset is on\n");
2638                 ena_dump_stats_to_dmesg(adapter);
2639                 queue_work(ena_wq, &adapter->reset_task);
2640                 return;
2641         }
2642
2643         /* Reset the timer */
2644         mod_timer(&adapter->timer_service, jiffies + HZ);
2645 }
2646
2647 static int ena_calc_io_queue_num(struct pci_dev *pdev,
2648                                  struct ena_com_dev *ena_dev,
2649                                  struct ena_com_dev_get_features_ctx *get_feat_ctx)
2650 {
2651         int io_sq_num, io_queue_num;
2652
2653         /* In case of LLQ use the llq number in the get feature cmd */
2654         if (ena_dev->tx_mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV) {
2655                 io_sq_num = get_feat_ctx->max_queues.max_llq_num;
2656
2657                 if (io_sq_num == 0) {
2658                         dev_err(&pdev->dev,
2659                                 "Trying to use LLQ but llq_num is 0. Fall back into regular queues\n");
2660
2661                         ena_dev->tx_mem_queue_type =
2662                                 ENA_ADMIN_PLACEMENT_POLICY_HOST;
2663                         io_sq_num = get_feat_ctx->max_queues.max_sq_num;
2664                 }
2665         } else {
2666                 io_sq_num = get_feat_ctx->max_queues.max_sq_num;
2667         }
2668
2669         io_queue_num = min_t(int, num_possible_cpus(), ENA_MAX_NUM_IO_QUEUES);
2670         io_queue_num = min_t(int, io_queue_num, io_sq_num);
2671         io_queue_num = min_t(int, io_queue_num,
2672                              get_feat_ctx->max_queues.max_cq_num);
2673         /* 1 IRQ for for mgmnt and 1 IRQs for each IO direction */
2674         io_queue_num = min_t(int, io_queue_num, pci_msix_vec_count(pdev) - 1);
2675         if (unlikely(!io_queue_num)) {
2676                 dev_err(&pdev->dev, "The device doesn't have io queues\n");
2677                 return -EFAULT;
2678         }
2679
2680         return io_queue_num;
2681 }
2682
2683 static int ena_set_push_mode(struct pci_dev *pdev, struct ena_com_dev *ena_dev,
2684                              struct ena_com_dev_get_features_ctx *get_feat_ctx)
2685 {
2686         bool has_mem_bar;
2687
2688         has_mem_bar = pci_select_bars(pdev, IORESOURCE_MEM) & BIT(ENA_MEM_BAR);
2689
2690         /* Enable push mode if device supports LLQ */
2691         if (has_mem_bar && (get_feat_ctx->max_queues.max_llq_num > 0))
2692                 ena_dev->tx_mem_queue_type = ENA_ADMIN_PLACEMENT_POLICY_DEV;
2693         else
2694                 ena_dev->tx_mem_queue_type = ENA_ADMIN_PLACEMENT_POLICY_HOST;
2695
2696         return 0;
2697 }
2698
2699 static void ena_set_dev_offloads(struct ena_com_dev_get_features_ctx *feat,
2700                                  struct net_device *netdev)
2701 {
2702         netdev_features_t dev_features = 0;
2703
2704         /* Set offload features */
2705         if (feat->offload.tx &
2706                 ENA_ADMIN_FEATURE_OFFLOAD_DESC_TX_L4_IPV4_CSUM_PART_MASK)
2707                 dev_features |= NETIF_F_IP_CSUM;
2708
2709         if (feat->offload.tx &
2710                 ENA_ADMIN_FEATURE_OFFLOAD_DESC_TX_L4_IPV6_CSUM_PART_MASK)
2711                 dev_features |= NETIF_F_IPV6_CSUM;
2712
2713         if (feat->offload.tx & ENA_ADMIN_FEATURE_OFFLOAD_DESC_TSO_IPV4_MASK)
2714                 dev_features |= NETIF_F_TSO;
2715
2716         if (feat->offload.tx & ENA_ADMIN_FEATURE_OFFLOAD_DESC_TSO_IPV6_MASK)
2717                 dev_features |= NETIF_F_TSO6;
2718
2719         if (feat->offload.tx & ENA_ADMIN_FEATURE_OFFLOAD_DESC_TSO_ECN_MASK)
2720                 dev_features |= NETIF_F_TSO_ECN;
2721
2722         if (feat->offload.rx_supported &
2723                 ENA_ADMIN_FEATURE_OFFLOAD_DESC_RX_L4_IPV4_CSUM_MASK)
2724                 dev_features |= NETIF_F_RXCSUM;
2725
2726         if (feat->offload.rx_supported &
2727                 ENA_ADMIN_FEATURE_OFFLOAD_DESC_RX_L4_IPV6_CSUM_MASK)
2728                 dev_features |= NETIF_F_RXCSUM;
2729
2730         netdev->features =
2731                 dev_features |
2732                 NETIF_F_SG |
2733                 NETIF_F_NTUPLE |
2734                 NETIF_F_RXHASH |
2735                 NETIF_F_HIGHDMA;
2736
2737         netdev->hw_features |= netdev->features;
2738         netdev->vlan_features |= netdev->features;
2739 }
2740
2741 static void ena_set_conf_feat_params(struct ena_adapter *adapter,
2742                                      struct ena_com_dev_get_features_ctx *feat)
2743 {
2744         struct net_device *netdev = adapter->netdev;
2745
2746         /* Copy mac address */
2747         if (!is_valid_ether_addr(feat->dev_attr.mac_addr)) {
2748                 eth_hw_addr_random(netdev);
2749                 ether_addr_copy(adapter->mac_addr, netdev->dev_addr);
2750         } else {
2751                 ether_addr_copy(adapter->mac_addr, feat->dev_attr.mac_addr);
2752                 ether_addr_copy(netdev->dev_addr, adapter->mac_addr);
2753         }
2754
2755         /* Set offload features */
2756         ena_set_dev_offloads(feat, netdev);
2757
2758         adapter->max_mtu = feat->dev_attr.max_mtu;
2759 }
2760
2761 static int ena_rss_init_default(struct ena_adapter *adapter)
2762 {
2763         struct ena_com_dev *ena_dev = adapter->ena_dev;
2764         struct device *dev = &adapter->pdev->dev;
2765         int rc, i;
2766         u32 val;
2767
2768         rc = ena_com_rss_init(ena_dev, ENA_RX_RSS_TABLE_LOG_SIZE);
2769         if (unlikely(rc)) {
2770                 dev_err(dev, "Cannot init indirect table\n");
2771                 goto err_rss_init;
2772         }
2773
2774         for (i = 0; i < ENA_RX_RSS_TABLE_SIZE; i++) {
2775                 val = ethtool_rxfh_indir_default(i, adapter->num_queues);
2776                 rc = ena_com_indirect_table_fill_entry(ena_dev, i,
2777                                                        ENA_IO_RXQ_IDX(val));
2778                 if (unlikely(rc && (rc != -EPERM))) {
2779                         dev_err(dev, "Cannot fill indirect table\n");
2780                         goto err_fill_indir;
2781                 }
2782         }
2783
2784         rc = ena_com_fill_hash_function(ena_dev, ENA_ADMIN_CRC32, NULL,
2785                                         ENA_HASH_KEY_SIZE, 0xFFFFFFFF);
2786         if (unlikely(rc && (rc != -EPERM))) {
2787                 dev_err(dev, "Cannot fill hash function\n");
2788                 goto err_fill_indir;
2789         }
2790
2791         rc = ena_com_set_default_hash_ctrl(ena_dev);
2792         if (unlikely(rc && (rc != -EPERM))) {
2793                 dev_err(dev, "Cannot fill hash control\n");
2794                 goto err_fill_indir;
2795         }
2796
2797         return 0;
2798
2799 err_fill_indir:
2800         ena_com_rss_destroy(ena_dev);
2801 err_rss_init:
2802
2803         return rc;
2804 }
2805
2806 static void ena_release_bars(struct ena_com_dev *ena_dev, struct pci_dev *pdev)
2807 {
2808         int release_bars;
2809
2810         release_bars = pci_select_bars(pdev, IORESOURCE_MEM) & ENA_BAR_MASK;
2811         pci_release_selected_regions(pdev, release_bars);
2812 }
2813
2814 static int ena_calc_queue_size(struct pci_dev *pdev,
2815                                struct ena_com_dev *ena_dev,
2816                                u16 *max_tx_sgl_size,
2817                                u16 *max_rx_sgl_size,
2818                                struct ena_com_dev_get_features_ctx *get_feat_ctx)
2819 {
2820         u32 queue_size = ENA_DEFAULT_RING_SIZE;
2821
2822         queue_size = min_t(u32, queue_size,
2823                            get_feat_ctx->max_queues.max_cq_depth);
2824         queue_size = min_t(u32, queue_size,
2825                            get_feat_ctx->max_queues.max_sq_depth);
2826
2827         if (ena_dev->tx_mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV)
2828                 queue_size = min_t(u32, queue_size,
2829                                    get_feat_ctx->max_queues.max_llq_depth);
2830
2831         queue_size = rounddown_pow_of_two(queue_size);
2832
2833         if (unlikely(!queue_size)) {
2834                 dev_err(&pdev->dev, "Invalid queue size\n");
2835                 return -EFAULT;
2836         }
2837
2838         *max_tx_sgl_size = min_t(u16, ENA_PKT_MAX_BUFS,
2839                                  get_feat_ctx->max_queues.max_packet_tx_descs);
2840         *max_rx_sgl_size = min_t(u16, ENA_PKT_MAX_BUFS,
2841                                  get_feat_ctx->max_queues.max_packet_rx_descs);
2842
2843         return queue_size;
2844 }
2845
2846 /* ena_probe - Device Initialization Routine
2847  * @pdev: PCI device information struct
2848  * @ent: entry in ena_pci_tbl
2849  *
2850  * Returns 0 on success, negative on failure
2851  *
2852  * ena_probe initializes an adapter identified by a pci_dev structure.
2853  * The OS initialization, configuring of the adapter private structure,
2854  * and a hardware reset occur.
2855  */
2856 static int ena_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2857 {
2858         struct ena_com_dev_get_features_ctx get_feat_ctx;
2859         static int version_printed;
2860         struct net_device *netdev;
2861         struct ena_adapter *adapter;
2862         struct ena_com_dev *ena_dev = NULL;
2863         static int adapters_found;
2864         int io_queue_num, bars, rc;
2865         int queue_size;
2866         u16 tx_sgl_size = 0;
2867         u16 rx_sgl_size = 0;
2868         bool wd_state;
2869
2870         dev_dbg(&pdev->dev, "%s\n", __func__);
2871
2872         if (version_printed++ == 0)
2873                 dev_info(&pdev->dev, "%s", version);
2874
2875         rc = pci_enable_device_mem(pdev);
2876         if (rc) {
2877                 dev_err(&pdev->dev, "pci_enable_device_mem() failed!\n");
2878                 return rc;
2879         }
2880
2881         pci_set_master(pdev);
2882
2883         ena_dev = vzalloc(sizeof(*ena_dev));
2884         if (!ena_dev) {
2885                 rc = -ENOMEM;
2886                 goto err_disable_device;
2887         }
2888
2889         bars = pci_select_bars(pdev, IORESOURCE_MEM) & ENA_BAR_MASK;
2890         rc = pci_request_selected_regions(pdev, bars, DRV_MODULE_NAME);
2891         if (rc) {
2892                 dev_err(&pdev->dev, "pci_request_selected_regions failed %d\n",
2893                         rc);
2894                 goto err_free_ena_dev;
2895         }
2896
2897         ena_dev->reg_bar = ioremap(pci_resource_start(pdev, ENA_REG_BAR),
2898                                    pci_resource_len(pdev, ENA_REG_BAR));
2899         if (!ena_dev->reg_bar) {
2900                 dev_err(&pdev->dev, "failed to remap regs bar\n");
2901                 rc = -EFAULT;
2902                 goto err_free_region;
2903         }
2904
2905         ena_dev->dmadev = &pdev->dev;
2906
2907         rc = ena_device_init(ena_dev, pdev, &get_feat_ctx, &wd_state);
2908         if (rc) {
2909                 dev_err(&pdev->dev, "ena device init failed\n");
2910                 if (rc == -ETIME)
2911                         rc = -EPROBE_DEFER;
2912                 goto err_free_region;
2913         }
2914
2915         rc = ena_set_push_mode(pdev, ena_dev, &get_feat_ctx);
2916         if (rc) {
2917                 dev_err(&pdev->dev, "Invalid module param(push_mode)\n");
2918                 goto err_device_destroy;
2919         }
2920
2921         if (ena_dev->tx_mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV) {
2922                 ena_dev->mem_bar = ioremap_wc(pci_resource_start(pdev, ENA_MEM_BAR),
2923                                               pci_resource_len(pdev, ENA_MEM_BAR));
2924                 if (!ena_dev->mem_bar) {
2925                         rc = -EFAULT;
2926                         goto err_device_destroy;
2927                 }
2928         }
2929
2930         /* initial Tx interrupt delay, Assumes 1 usec granularity.
2931         * Updated during device initialization with the real granularity
2932         */
2933         ena_dev->intr_moder_tx_interval = ENA_INTR_INITIAL_TX_INTERVAL_USECS;
2934         io_queue_num = ena_calc_io_queue_num(pdev, ena_dev, &get_feat_ctx);
2935         queue_size = ena_calc_queue_size(pdev, ena_dev, &tx_sgl_size,
2936                                          &rx_sgl_size, &get_feat_ctx);
2937         if ((queue_size <= 0) || (io_queue_num <= 0)) {
2938                 rc = -EFAULT;
2939                 goto err_device_destroy;
2940         }
2941
2942         dev_info(&pdev->dev, "creating %d io queues. queue size: %d\n",
2943                  io_queue_num, queue_size);
2944
2945         /* dev zeroed in init_etherdev */
2946         netdev = alloc_etherdev_mq(sizeof(struct ena_adapter), io_queue_num);
2947         if (!netdev) {
2948                 dev_err(&pdev->dev, "alloc_etherdev_mq failed\n");
2949                 rc = -ENOMEM;
2950                 goto err_device_destroy;
2951         }
2952
2953         SET_NETDEV_DEV(netdev, &pdev->dev);
2954
2955         adapter = netdev_priv(netdev);
2956         pci_set_drvdata(pdev, adapter);
2957
2958         adapter->ena_dev = ena_dev;
2959         adapter->netdev = netdev;
2960         adapter->pdev = pdev;
2961
2962         ena_set_conf_feat_params(adapter, &get_feat_ctx);
2963
2964         adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
2965
2966         adapter->tx_ring_size = queue_size;
2967         adapter->rx_ring_size = queue_size;
2968
2969         adapter->max_tx_sgl_size = tx_sgl_size;
2970         adapter->max_rx_sgl_size = rx_sgl_size;
2971
2972         adapter->num_queues = io_queue_num;
2973         adapter->last_monitored_tx_qid = 0;
2974
2975         adapter->rx_copybreak = ENA_DEFAULT_RX_COPYBREAK;
2976         adapter->wd_state = wd_state;
2977
2978         snprintf(adapter->name, ENA_NAME_MAX_LEN, "ena_%d", adapters_found);
2979
2980         rc = ena_com_init_interrupt_moderation(adapter->ena_dev);
2981         if (rc) {
2982                 dev_err(&pdev->dev,
2983                         "Failed to query interrupt moderation feature\n");
2984                 goto err_netdev_destroy;
2985         }
2986         ena_init_io_rings(adapter);
2987
2988         netdev->netdev_ops = &ena_netdev_ops;
2989         netdev->watchdog_timeo = TX_TIMEOUT;
2990         ena_set_ethtool_ops(netdev);
2991
2992         netdev->priv_flags |= IFF_UNICAST_FLT;
2993
2994         u64_stats_init(&adapter->syncp);
2995
2996         rc = ena_enable_msix_and_set_admin_interrupts(adapter, io_queue_num);
2997         if (rc) {
2998                 dev_err(&pdev->dev,
2999                         "Failed to enable and set the admin interrupts\n");
3000                 goto err_worker_destroy;
3001         }
3002         rc = ena_rss_init_default(adapter);
3003         if (rc && (rc != -EPERM)) {
3004                 dev_err(&pdev->dev, "Cannot init RSS rc: %d\n", rc);
3005                 goto err_free_msix;
3006         }
3007
3008         ena_config_debug_area(adapter);
3009
3010         memcpy(adapter->netdev->perm_addr, adapter->mac_addr, netdev->addr_len);
3011
3012         netif_carrier_off(netdev);
3013
3014         rc = register_netdev(netdev);
3015         if (rc) {
3016                 dev_err(&pdev->dev, "Cannot register net device\n");
3017                 goto err_rss;
3018         }
3019
3020         INIT_WORK(&adapter->suspend_io_task, ena_device_io_suspend);
3021         INIT_WORK(&adapter->resume_io_task, ena_device_io_resume);
3022         INIT_WORK(&adapter->reset_task, ena_fw_reset_device);
3023
3024         adapter->last_keep_alive_jiffies = jiffies;
3025
3026         init_timer(&adapter->timer_service);
3027         adapter->timer_service.expires = round_jiffies(jiffies + HZ);
3028         adapter->timer_service.function = ena_timer_service;
3029         adapter->timer_service.data = (unsigned long)adapter;
3030
3031         add_timer(&adapter->timer_service);
3032
3033         dev_info(&pdev->dev, "%s found at mem %lx, mac addr %pM Queues %d\n",
3034                  DEVICE_NAME, (long)pci_resource_start(pdev, 0),
3035                  netdev->dev_addr, io_queue_num);
3036
3037         set_bit(ENA_FLAG_DEVICE_RUNNING, &adapter->flags);
3038
3039         adapters_found++;
3040
3041         return 0;
3042
3043 err_rss:
3044         ena_com_delete_debug_area(ena_dev);
3045         ena_com_rss_destroy(ena_dev);
3046 err_free_msix:
3047         ena_com_dev_reset(ena_dev);
3048         ena_free_mgmnt_irq(adapter);
3049         ena_disable_msix(adapter);
3050 err_worker_destroy:
3051         ena_com_destroy_interrupt_moderation(ena_dev);
3052         del_timer(&adapter->timer_service);
3053         cancel_work_sync(&adapter->suspend_io_task);
3054         cancel_work_sync(&adapter->resume_io_task);
3055 err_netdev_destroy:
3056         free_netdev(netdev);
3057 err_device_destroy:
3058         ena_com_delete_host_info(ena_dev);
3059         ena_com_admin_destroy(ena_dev);
3060 err_free_region:
3061         ena_release_bars(ena_dev, pdev);
3062 err_free_ena_dev:
3063         pci_set_drvdata(pdev, NULL);
3064         vfree(ena_dev);
3065 err_disable_device:
3066         pci_disable_device(pdev);
3067         return rc;
3068 }
3069
3070 /*****************************************************************************/
3071 static int ena_sriov_configure(struct pci_dev *dev, int numvfs)
3072 {
3073         int rc;
3074
3075         if (numvfs > 0) {
3076                 rc = pci_enable_sriov(dev, numvfs);
3077                 if (rc != 0) {
3078                         dev_err(&dev->dev,
3079                                 "pci_enable_sriov failed to enable: %d vfs with the error: %d\n",
3080                                 numvfs, rc);
3081                         return rc;
3082                 }
3083
3084                 return numvfs;
3085         }
3086
3087         if (numvfs == 0) {
3088                 pci_disable_sriov(dev);
3089                 return 0;
3090         }
3091
3092         return -EINVAL;
3093 }
3094
3095 /*****************************************************************************/
3096 /*****************************************************************************/
3097
3098 /* ena_remove - Device Removal Routine
3099  * @pdev: PCI device information struct
3100  *
3101  * ena_remove is called by the PCI subsystem to alert the driver
3102  * that it should release a PCI device.
3103  */
3104 static void ena_remove(struct pci_dev *pdev)
3105 {
3106         struct ena_adapter *adapter = pci_get_drvdata(pdev);
3107         struct ena_com_dev *ena_dev;
3108         struct net_device *netdev;
3109
3110         if (!adapter)
3111                 /* This device didn't load properly and it's resources
3112                  * already released, nothing to do
3113                  */
3114                 return;
3115
3116         ena_dev = adapter->ena_dev;
3117         netdev = adapter->netdev;
3118
3119 #ifdef CONFIG_RFS_ACCEL
3120         if ((adapter->msix_vecs >= 1) && (netdev->rx_cpu_rmap)) {
3121                 free_irq_cpu_rmap(netdev->rx_cpu_rmap);
3122                 netdev->rx_cpu_rmap = NULL;
3123         }
3124 #endif /* CONFIG_RFS_ACCEL */
3125
3126         unregister_netdev(netdev);
3127         del_timer_sync(&adapter->timer_service);
3128
3129         cancel_work_sync(&adapter->reset_task);
3130
3131         cancel_work_sync(&adapter->suspend_io_task);
3132
3133         cancel_work_sync(&adapter->resume_io_task);
3134
3135         ena_com_dev_reset(ena_dev);
3136
3137         ena_free_mgmnt_irq(adapter);
3138
3139         ena_disable_msix(adapter);
3140
3141         free_netdev(netdev);
3142
3143         ena_com_mmio_reg_read_request_destroy(ena_dev);
3144
3145         ena_com_abort_admin_commands(ena_dev);
3146
3147         ena_com_wait_for_abort_completion(ena_dev);
3148
3149         ena_com_admin_destroy(ena_dev);
3150
3151         ena_com_rss_destroy(ena_dev);
3152
3153         ena_com_delete_debug_area(ena_dev);
3154
3155         ena_com_delete_host_info(ena_dev);
3156
3157         ena_release_bars(ena_dev, pdev);
3158
3159         pci_set_drvdata(pdev, NULL);
3160
3161         pci_disable_device(pdev);
3162
3163         ena_com_destroy_interrupt_moderation(ena_dev);
3164
3165         vfree(ena_dev);
3166 }
3167
3168 static struct pci_driver ena_pci_driver = {
3169         .name           = DRV_MODULE_NAME,
3170         .id_table       = ena_pci_tbl,
3171         .probe          = ena_probe,
3172         .remove         = ena_remove,
3173         .sriov_configure = ena_sriov_configure,
3174 };
3175
3176 static int __init ena_init(void)
3177 {
3178         pr_info("%s", version);
3179
3180         ena_wq = create_singlethread_workqueue(DRV_MODULE_NAME);
3181         if (!ena_wq) {
3182                 pr_err("Failed to create workqueue\n");
3183                 return -ENOMEM;
3184         }
3185
3186         return pci_register_driver(&ena_pci_driver);
3187 }
3188
3189 static void __exit ena_cleanup(void)
3190 {
3191         pci_unregister_driver(&ena_pci_driver);
3192
3193         if (ena_wq) {
3194                 destroy_workqueue(ena_wq);
3195                 ena_wq = NULL;
3196         }
3197 }
3198
3199 /******************************************************************************
3200  ******************************** AENQ Handlers *******************************
3201  *****************************************************************************/
3202 /* ena_update_on_link_change:
3203  * Notify the network interface about the change in link status
3204  */
3205 static void ena_update_on_link_change(void *adapter_data,
3206                                       struct ena_admin_aenq_entry *aenq_e)
3207 {
3208         struct ena_adapter *adapter = (struct ena_adapter *)adapter_data;
3209         struct ena_admin_aenq_link_change_desc *aenq_desc =
3210                 (struct ena_admin_aenq_link_change_desc *)aenq_e;
3211         int status = aenq_desc->flags &
3212                 ENA_ADMIN_AENQ_LINK_CHANGE_DESC_LINK_STATUS_MASK;
3213
3214         if (status) {
3215                 netdev_dbg(adapter->netdev, "%s\n", __func__);
3216                 set_bit(ENA_FLAG_LINK_UP, &adapter->flags);
3217                 netif_carrier_on(adapter->netdev);
3218         } else {
3219                 clear_bit(ENA_FLAG_LINK_UP, &adapter->flags);
3220                 netif_carrier_off(adapter->netdev);
3221         }
3222 }
3223
3224 static void ena_keep_alive_wd(void *adapter_data,
3225                               struct ena_admin_aenq_entry *aenq_e)
3226 {
3227         struct ena_adapter *adapter = (struct ena_adapter *)adapter_data;
3228
3229         adapter->last_keep_alive_jiffies = jiffies;
3230 }
3231
3232 static void ena_notification(void *adapter_data,
3233                              struct ena_admin_aenq_entry *aenq_e)
3234 {
3235         struct ena_adapter *adapter = (struct ena_adapter *)adapter_data;
3236
3237         WARN(aenq_e->aenq_common_desc.group != ENA_ADMIN_NOTIFICATION,
3238              "Invalid group(%x) expected %x\n",
3239              aenq_e->aenq_common_desc.group,
3240              ENA_ADMIN_NOTIFICATION);
3241
3242         switch (aenq_e->aenq_common_desc.syndrom) {
3243         case ENA_ADMIN_SUSPEND:
3244                 /* Suspend just the IO queues.
3245                  * We deliberately don't suspend admin so the timer and
3246                  * the keep_alive events should remain.
3247                  */
3248                 queue_work(ena_wq, &adapter->suspend_io_task);
3249                 break;
3250         case ENA_ADMIN_RESUME:
3251                 queue_work(ena_wq, &adapter->resume_io_task);
3252                 break;
3253         default:
3254                 netif_err(adapter, drv, adapter->netdev,
3255                           "Invalid aenq notification link state %d\n",
3256                           aenq_e->aenq_common_desc.syndrom);
3257         }
3258 }
3259
3260 /* This handler will called for unknown event group or unimplemented handlers*/
3261 static void unimplemented_aenq_handler(void *data,
3262                                        struct ena_admin_aenq_entry *aenq_e)
3263 {
3264         struct ena_adapter *adapter = (struct ena_adapter *)data;
3265
3266         netif_err(adapter, drv, adapter->netdev,
3267                   "Unknown event was received or event with unimplemented handler\n");
3268 }
3269
3270 static struct ena_aenq_handlers aenq_handlers = {
3271         .handlers = {
3272                 [ENA_ADMIN_LINK_CHANGE] = ena_update_on_link_change,
3273                 [ENA_ADMIN_NOTIFICATION] = ena_notification,
3274                 [ENA_ADMIN_KEEP_ALIVE] = ena_keep_alive_wd,
3275         },
3276         .unimplemented_handler = unimplemented_aenq_handler
3277 };
3278
3279 module_init(ena_init);
3280 module_exit(ena_cleanup);