Merge tag 'mmc-v4.14-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
[sfrench/cifs-2.6.git] / drivers / net / ethernet / cavium / thunder / nicvf_main.c
1 /*
2  * Copyright (C) 2015 Cavium, Inc.
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms of version 2 of the GNU General Public License
6  * as published by the Free Software Foundation.
7  */
8
9 #include <linux/module.h>
10 #include <linux/interrupt.h>
11 #include <linux/pci.h>
12 #include <linux/netdevice.h>
13 #include <linux/if_vlan.h>
14 #include <linux/etherdevice.h>
15 #include <linux/ethtool.h>
16 #include <linux/log2.h>
17 #include <linux/prefetch.h>
18 #include <linux/irq.h>
19 #include <linux/iommu.h>
20 #include <linux/bpf.h>
21 #include <linux/bpf_trace.h>
22 #include <linux/filter.h>
23
24 #include "nic_reg.h"
25 #include "nic.h"
26 #include "nicvf_queues.h"
27 #include "thunder_bgx.h"
28
29 #define DRV_NAME        "thunder-nicvf"
30 #define DRV_VERSION     "1.0"
31
32 /* Supported devices */
33 static const struct pci_device_id nicvf_id_table[] = {
34         { PCI_DEVICE_SUB(PCI_VENDOR_ID_CAVIUM,
35                          PCI_DEVICE_ID_THUNDER_NIC_VF,
36                          PCI_VENDOR_ID_CAVIUM,
37                          PCI_SUBSYS_DEVID_88XX_NIC_VF) },
38         { PCI_DEVICE_SUB(PCI_VENDOR_ID_CAVIUM,
39                          PCI_DEVICE_ID_THUNDER_PASS1_NIC_VF,
40                          PCI_VENDOR_ID_CAVIUM,
41                          PCI_SUBSYS_DEVID_88XX_PASS1_NIC_VF) },
42         { PCI_DEVICE_SUB(PCI_VENDOR_ID_CAVIUM,
43                          PCI_DEVICE_ID_THUNDER_NIC_VF,
44                          PCI_VENDOR_ID_CAVIUM,
45                          PCI_SUBSYS_DEVID_81XX_NIC_VF) },
46         { PCI_DEVICE_SUB(PCI_VENDOR_ID_CAVIUM,
47                          PCI_DEVICE_ID_THUNDER_NIC_VF,
48                          PCI_VENDOR_ID_CAVIUM,
49                          PCI_SUBSYS_DEVID_83XX_NIC_VF) },
50         { 0, }  /* end of table */
51 };
52
53 MODULE_AUTHOR("Sunil Goutham");
54 MODULE_DESCRIPTION("Cavium Thunder NIC Virtual Function Driver");
55 MODULE_LICENSE("GPL v2");
56 MODULE_VERSION(DRV_VERSION);
57 MODULE_DEVICE_TABLE(pci, nicvf_id_table);
58
59 static int debug = 0x00;
60 module_param(debug, int, 0644);
61 MODULE_PARM_DESC(debug, "Debug message level bitmap");
62
63 static int cpi_alg = CPI_ALG_NONE;
64 module_param(cpi_alg, int, S_IRUGO);
65 MODULE_PARM_DESC(cpi_alg,
66                  "PFC algorithm (0=none, 1=VLAN, 2=VLAN16, 3=IP Diffserv)");
67
68 static inline u8 nicvf_netdev_qidx(struct nicvf *nic, u8 qidx)
69 {
70         if (nic->sqs_mode)
71                 return qidx + ((nic->sqs_id + 1) * MAX_CMP_QUEUES_PER_QS);
72         else
73                 return qidx;
74 }
75
76 /* The Cavium ThunderX network controller can *only* be found in SoCs
77  * containing the ThunderX ARM64 CPU implementation.  All accesses to the device
78  * registers on this platform are implicitly strongly ordered with respect
79  * to memory accesses. So writeq_relaxed() and readq_relaxed() are safe to use
80  * with no memory barriers in this driver.  The readq()/writeq() functions add
81  * explicit ordering operation which in this case are redundant, and only
82  * add overhead.
83  */
84
85 /* Register read/write APIs */
86 void nicvf_reg_write(struct nicvf *nic, u64 offset, u64 val)
87 {
88         writeq_relaxed(val, nic->reg_base + offset);
89 }
90
91 u64 nicvf_reg_read(struct nicvf *nic, u64 offset)
92 {
93         return readq_relaxed(nic->reg_base + offset);
94 }
95
96 void nicvf_queue_reg_write(struct nicvf *nic, u64 offset,
97                            u64 qidx, u64 val)
98 {
99         void __iomem *addr = nic->reg_base + offset;
100
101         writeq_relaxed(val, addr + (qidx << NIC_Q_NUM_SHIFT));
102 }
103
104 u64 nicvf_queue_reg_read(struct nicvf *nic, u64 offset, u64 qidx)
105 {
106         void __iomem *addr = nic->reg_base + offset;
107
108         return readq_relaxed(addr + (qidx << NIC_Q_NUM_SHIFT));
109 }
110
111 /* VF -> PF mailbox communication */
112 static void nicvf_write_to_mbx(struct nicvf *nic, union nic_mbx *mbx)
113 {
114         u64 *msg = (u64 *)mbx;
115
116         nicvf_reg_write(nic, NIC_VF_PF_MAILBOX_0_1 + 0, msg[0]);
117         nicvf_reg_write(nic, NIC_VF_PF_MAILBOX_0_1 + 8, msg[1]);
118 }
119
120 int nicvf_send_msg_to_pf(struct nicvf *nic, union nic_mbx *mbx)
121 {
122         int timeout = NIC_MBOX_MSG_TIMEOUT;
123         int sleep = 10;
124
125         nic->pf_acked = false;
126         nic->pf_nacked = false;
127
128         nicvf_write_to_mbx(nic, mbx);
129
130         /* Wait for previous message to be acked, timeout 2sec */
131         while (!nic->pf_acked) {
132                 if (nic->pf_nacked) {
133                         netdev_err(nic->netdev,
134                                    "PF NACK to mbox msg 0x%02x from VF%d\n",
135                                    (mbx->msg.msg & 0xFF), nic->vf_id);
136                         return -EINVAL;
137                 }
138                 msleep(sleep);
139                 if (nic->pf_acked)
140                         break;
141                 timeout -= sleep;
142                 if (!timeout) {
143                         netdev_err(nic->netdev,
144                                    "PF didn't ACK to mbox msg 0x%02x from VF%d\n",
145                                    (mbx->msg.msg & 0xFF), nic->vf_id);
146                         return -EBUSY;
147                 }
148         }
149         return 0;
150 }
151
152 /* Checks if VF is able to comminicate with PF
153 * and also gets the VNIC number this VF is associated to.
154 */
155 static int nicvf_check_pf_ready(struct nicvf *nic)
156 {
157         union nic_mbx mbx = {};
158
159         mbx.msg.msg = NIC_MBOX_MSG_READY;
160         if (nicvf_send_msg_to_pf(nic, &mbx)) {
161                 netdev_err(nic->netdev,
162                            "PF didn't respond to READY msg\n");
163                 return 0;
164         }
165
166         return 1;
167 }
168
169 static void nicvf_read_bgx_stats(struct nicvf *nic, struct bgx_stats_msg *bgx)
170 {
171         if (bgx->rx)
172                 nic->bgx_stats.rx_stats[bgx->idx] = bgx->stats;
173         else
174                 nic->bgx_stats.tx_stats[bgx->idx] = bgx->stats;
175 }
176
177 static void  nicvf_handle_mbx_intr(struct nicvf *nic)
178 {
179         union nic_mbx mbx = {};
180         u64 *mbx_data;
181         u64 mbx_addr;
182         int i;
183
184         mbx_addr = NIC_VF_PF_MAILBOX_0_1;
185         mbx_data = (u64 *)&mbx;
186
187         for (i = 0; i < NIC_PF_VF_MAILBOX_SIZE; i++) {
188                 *mbx_data = nicvf_reg_read(nic, mbx_addr);
189                 mbx_data++;
190                 mbx_addr += sizeof(u64);
191         }
192
193         netdev_dbg(nic->netdev, "Mbox message: msg: 0x%x\n", mbx.msg.msg);
194         switch (mbx.msg.msg) {
195         case NIC_MBOX_MSG_READY:
196                 nic->pf_acked = true;
197                 nic->vf_id = mbx.nic_cfg.vf_id & 0x7F;
198                 nic->tns_mode = mbx.nic_cfg.tns_mode & 0x7F;
199                 nic->node = mbx.nic_cfg.node_id;
200                 if (!nic->set_mac_pending)
201                         ether_addr_copy(nic->netdev->dev_addr,
202                                         mbx.nic_cfg.mac_addr);
203                 nic->sqs_mode = mbx.nic_cfg.sqs_mode;
204                 nic->loopback_supported = mbx.nic_cfg.loopback_supported;
205                 nic->link_up = false;
206                 nic->duplex = 0;
207                 nic->speed = 0;
208                 break;
209         case NIC_MBOX_MSG_ACK:
210                 nic->pf_acked = true;
211                 break;
212         case NIC_MBOX_MSG_NACK:
213                 nic->pf_nacked = true;
214                 break;
215         case NIC_MBOX_MSG_RSS_SIZE:
216                 nic->rss_info.rss_size = mbx.rss_size.ind_tbl_size;
217                 nic->pf_acked = true;
218                 break;
219         case NIC_MBOX_MSG_BGX_STATS:
220                 nicvf_read_bgx_stats(nic, &mbx.bgx_stats);
221                 nic->pf_acked = true;
222                 break;
223         case NIC_MBOX_MSG_BGX_LINK_CHANGE:
224                 nic->pf_acked = true;
225                 nic->link_up = mbx.link_status.link_up;
226                 nic->duplex = mbx.link_status.duplex;
227                 nic->speed = mbx.link_status.speed;
228                 nic->mac_type = mbx.link_status.mac_type;
229                 if (nic->link_up) {
230                         netdev_info(nic->netdev, "Link is Up %d Mbps %s duplex\n",
231                                     nic->speed,
232                                     nic->duplex == DUPLEX_FULL ?
233                                     "Full" : "Half");
234                         netif_carrier_on(nic->netdev);
235                         netif_tx_start_all_queues(nic->netdev);
236                 } else {
237                         netdev_info(nic->netdev, "Link is Down\n");
238                         netif_carrier_off(nic->netdev);
239                         netif_tx_stop_all_queues(nic->netdev);
240                 }
241                 break;
242         case NIC_MBOX_MSG_ALLOC_SQS:
243                 nic->sqs_count = mbx.sqs_alloc.qs_count;
244                 nic->pf_acked = true;
245                 break;
246         case NIC_MBOX_MSG_SNICVF_PTR:
247                 /* Primary VF: make note of secondary VF's pointer
248                  * to be used while packet transmission.
249                  */
250                 nic->snicvf[mbx.nicvf.sqs_id] =
251                         (struct nicvf *)mbx.nicvf.nicvf;
252                 nic->pf_acked = true;
253                 break;
254         case NIC_MBOX_MSG_PNICVF_PTR:
255                 /* Secondary VF/Qset: make note of primary VF's pointer
256                  * to be used while packet reception, to handover packet
257                  * to primary VF's netdev.
258                  */
259                 nic->pnicvf = (struct nicvf *)mbx.nicvf.nicvf;
260                 nic->pf_acked = true;
261                 break;
262         case NIC_MBOX_MSG_PFC:
263                 nic->pfc.autoneg = mbx.pfc.autoneg;
264                 nic->pfc.fc_rx = mbx.pfc.fc_rx;
265                 nic->pfc.fc_tx = mbx.pfc.fc_tx;
266                 nic->pf_acked = true;
267                 break;
268         default:
269                 netdev_err(nic->netdev,
270                            "Invalid message from PF, msg 0x%x\n", mbx.msg.msg);
271                 break;
272         }
273         nicvf_clear_intr(nic, NICVF_INTR_MBOX, 0);
274 }
275
276 static int nicvf_hw_set_mac_addr(struct nicvf *nic, struct net_device *netdev)
277 {
278         union nic_mbx mbx = {};
279
280         mbx.mac.msg = NIC_MBOX_MSG_SET_MAC;
281         mbx.mac.vf_id = nic->vf_id;
282         ether_addr_copy(mbx.mac.mac_addr, netdev->dev_addr);
283
284         return nicvf_send_msg_to_pf(nic, &mbx);
285 }
286
287 static void nicvf_config_cpi(struct nicvf *nic)
288 {
289         union nic_mbx mbx = {};
290
291         mbx.cpi_cfg.msg = NIC_MBOX_MSG_CPI_CFG;
292         mbx.cpi_cfg.vf_id = nic->vf_id;
293         mbx.cpi_cfg.cpi_alg = nic->cpi_alg;
294         mbx.cpi_cfg.rq_cnt = nic->qs->rq_cnt;
295
296         nicvf_send_msg_to_pf(nic, &mbx);
297 }
298
299 static void nicvf_get_rss_size(struct nicvf *nic)
300 {
301         union nic_mbx mbx = {};
302
303         mbx.rss_size.msg = NIC_MBOX_MSG_RSS_SIZE;
304         mbx.rss_size.vf_id = nic->vf_id;
305         nicvf_send_msg_to_pf(nic, &mbx);
306 }
307
308 void nicvf_config_rss(struct nicvf *nic)
309 {
310         union nic_mbx mbx = {};
311         struct nicvf_rss_info *rss = &nic->rss_info;
312         int ind_tbl_len = rss->rss_size;
313         int i, nextq = 0;
314
315         mbx.rss_cfg.vf_id = nic->vf_id;
316         mbx.rss_cfg.hash_bits = rss->hash_bits;
317         while (ind_tbl_len) {
318                 mbx.rss_cfg.tbl_offset = nextq;
319                 mbx.rss_cfg.tbl_len = min(ind_tbl_len,
320                                                RSS_IND_TBL_LEN_PER_MBX_MSG);
321                 mbx.rss_cfg.msg = mbx.rss_cfg.tbl_offset ?
322                           NIC_MBOX_MSG_RSS_CFG_CONT : NIC_MBOX_MSG_RSS_CFG;
323
324                 for (i = 0; i < mbx.rss_cfg.tbl_len; i++)
325                         mbx.rss_cfg.ind_tbl[i] = rss->ind_tbl[nextq++];
326
327                 nicvf_send_msg_to_pf(nic, &mbx);
328
329                 ind_tbl_len -= mbx.rss_cfg.tbl_len;
330         }
331 }
332
333 void nicvf_set_rss_key(struct nicvf *nic)
334 {
335         struct nicvf_rss_info *rss = &nic->rss_info;
336         u64 key_addr = NIC_VNIC_RSS_KEY_0_4;
337         int idx;
338
339         for (idx = 0; idx < RSS_HASH_KEY_SIZE; idx++) {
340                 nicvf_reg_write(nic, key_addr, rss->key[idx]);
341                 key_addr += sizeof(u64);
342         }
343 }
344
345 static int nicvf_rss_init(struct nicvf *nic)
346 {
347         struct nicvf_rss_info *rss = &nic->rss_info;
348         int idx;
349
350         nicvf_get_rss_size(nic);
351
352         if (cpi_alg != CPI_ALG_NONE) {
353                 rss->enable = false;
354                 rss->hash_bits = 0;
355                 return 0;
356         }
357
358         rss->enable = true;
359
360         netdev_rss_key_fill(rss->key, RSS_HASH_KEY_SIZE * sizeof(u64));
361         nicvf_set_rss_key(nic);
362
363         rss->cfg = RSS_IP_HASH_ENA | RSS_TCP_HASH_ENA | RSS_UDP_HASH_ENA;
364         nicvf_reg_write(nic, NIC_VNIC_RSS_CFG, rss->cfg);
365
366         rss->hash_bits =  ilog2(rounddown_pow_of_two(rss->rss_size));
367
368         for (idx = 0; idx < rss->rss_size; idx++)
369                 rss->ind_tbl[idx] = ethtool_rxfh_indir_default(idx,
370                                                                nic->rx_queues);
371         nicvf_config_rss(nic);
372         return 1;
373 }
374
375 /* Request PF to allocate additional Qsets */
376 static void nicvf_request_sqs(struct nicvf *nic)
377 {
378         union nic_mbx mbx = {};
379         int sqs;
380         int sqs_count = nic->sqs_count;
381         int rx_queues = 0, tx_queues = 0;
382
383         /* Only primary VF should request */
384         if (nic->sqs_mode ||  !nic->sqs_count)
385                 return;
386
387         mbx.sqs_alloc.msg = NIC_MBOX_MSG_ALLOC_SQS;
388         mbx.sqs_alloc.vf_id = nic->vf_id;
389         mbx.sqs_alloc.qs_count = nic->sqs_count;
390         if (nicvf_send_msg_to_pf(nic, &mbx)) {
391                 /* No response from PF */
392                 nic->sqs_count = 0;
393                 return;
394         }
395
396         /* Return if no Secondary Qsets available */
397         if (!nic->sqs_count)
398                 return;
399
400         if (nic->rx_queues > MAX_RCV_QUEUES_PER_QS)
401                 rx_queues = nic->rx_queues - MAX_RCV_QUEUES_PER_QS;
402
403         tx_queues = nic->tx_queues + nic->xdp_tx_queues;
404         if (tx_queues > MAX_SND_QUEUES_PER_QS)
405                 tx_queues = tx_queues - MAX_SND_QUEUES_PER_QS;
406
407         /* Set no of Rx/Tx queues in each of the SQsets */
408         for (sqs = 0; sqs < nic->sqs_count; sqs++) {
409                 mbx.nicvf.msg = NIC_MBOX_MSG_SNICVF_PTR;
410                 mbx.nicvf.vf_id = nic->vf_id;
411                 mbx.nicvf.sqs_id = sqs;
412                 nicvf_send_msg_to_pf(nic, &mbx);
413
414                 nic->snicvf[sqs]->sqs_id = sqs;
415                 if (rx_queues > MAX_RCV_QUEUES_PER_QS) {
416                         nic->snicvf[sqs]->qs->rq_cnt = MAX_RCV_QUEUES_PER_QS;
417                         rx_queues -= MAX_RCV_QUEUES_PER_QS;
418                 } else {
419                         nic->snicvf[sqs]->qs->rq_cnt = rx_queues;
420                         rx_queues = 0;
421                 }
422
423                 if (tx_queues > MAX_SND_QUEUES_PER_QS) {
424                         nic->snicvf[sqs]->qs->sq_cnt = MAX_SND_QUEUES_PER_QS;
425                         tx_queues -= MAX_SND_QUEUES_PER_QS;
426                 } else {
427                         nic->snicvf[sqs]->qs->sq_cnt = tx_queues;
428                         tx_queues = 0;
429                 }
430
431                 nic->snicvf[sqs]->qs->cq_cnt =
432                 max(nic->snicvf[sqs]->qs->rq_cnt, nic->snicvf[sqs]->qs->sq_cnt);
433
434                 /* Initialize secondary Qset's queues and its interrupts */
435                 nicvf_open(nic->snicvf[sqs]->netdev);
436         }
437
438         /* Update stack with actual Rx/Tx queue count allocated */
439         if (sqs_count != nic->sqs_count)
440                 nicvf_set_real_num_queues(nic->netdev,
441                                           nic->tx_queues, nic->rx_queues);
442 }
443
444 /* Send this Qset's nicvf pointer to PF.
445  * PF inturn sends primary VF's nicvf struct to secondary Qsets/VFs
446  * so that packets received by these Qsets can use primary VF's netdev
447  */
448 static void nicvf_send_vf_struct(struct nicvf *nic)
449 {
450         union nic_mbx mbx = {};
451
452         mbx.nicvf.msg = NIC_MBOX_MSG_NICVF_PTR;
453         mbx.nicvf.sqs_mode = nic->sqs_mode;
454         mbx.nicvf.nicvf = (u64)nic;
455         nicvf_send_msg_to_pf(nic, &mbx);
456 }
457
458 static void nicvf_get_primary_vf_struct(struct nicvf *nic)
459 {
460         union nic_mbx mbx = {};
461
462         mbx.nicvf.msg = NIC_MBOX_MSG_PNICVF_PTR;
463         nicvf_send_msg_to_pf(nic, &mbx);
464 }
465
466 int nicvf_set_real_num_queues(struct net_device *netdev,
467                               int tx_queues, int rx_queues)
468 {
469         int err = 0;
470
471         err = netif_set_real_num_tx_queues(netdev, tx_queues);
472         if (err) {
473                 netdev_err(netdev,
474                            "Failed to set no of Tx queues: %d\n", tx_queues);
475                 return err;
476         }
477
478         err = netif_set_real_num_rx_queues(netdev, rx_queues);
479         if (err)
480                 netdev_err(netdev,
481                            "Failed to set no of Rx queues: %d\n", rx_queues);
482         return err;
483 }
484
485 static int nicvf_init_resources(struct nicvf *nic)
486 {
487         int err;
488
489         /* Enable Qset */
490         nicvf_qset_config(nic, true);
491
492         /* Initialize queues and HW for data transfer */
493         err = nicvf_config_data_transfer(nic, true);
494         if (err) {
495                 netdev_err(nic->netdev,
496                            "Failed to alloc/config VF's QSet resources\n");
497                 return err;
498         }
499
500         return 0;
501 }
502
503 static inline bool nicvf_xdp_rx(struct nicvf *nic, struct bpf_prog *prog,
504                                 struct cqe_rx_t *cqe_rx, struct snd_queue *sq,
505                                 struct sk_buff **skb)
506 {
507         struct xdp_buff xdp;
508         struct page *page;
509         u32 action;
510         u16 len, offset = 0;
511         u64 dma_addr, cpu_addr;
512         void *orig_data;
513
514         /* Retrieve packet buffer's DMA address and length */
515         len = *((u16 *)((void *)cqe_rx + (3 * sizeof(u64))));
516         dma_addr = *((u64 *)((void *)cqe_rx + (7 * sizeof(u64))));
517
518         cpu_addr = nicvf_iova_to_phys(nic, dma_addr);
519         if (!cpu_addr)
520                 return false;
521         cpu_addr = (u64)phys_to_virt(cpu_addr);
522         page = virt_to_page((void *)cpu_addr);
523
524         xdp.data_hard_start = page_address(page);
525         xdp.data = (void *)cpu_addr;
526         xdp.data_end = xdp.data + len;
527         orig_data = xdp.data;
528
529         rcu_read_lock();
530         action = bpf_prog_run_xdp(prog, &xdp);
531         rcu_read_unlock();
532
533         /* Check if XDP program has changed headers */
534         if (orig_data != xdp.data) {
535                 len = xdp.data_end - xdp.data;
536                 offset = orig_data - xdp.data;
537                 dma_addr -= offset;
538         }
539
540         switch (action) {
541         case XDP_PASS:
542                 /* Check if it's a recycled page, if not
543                  * unmap the DMA mapping.
544                  *
545                  * Recycled page holds an extra reference.
546                  */
547                 if (page_ref_count(page) == 1) {
548                         dma_addr &= PAGE_MASK;
549                         dma_unmap_page_attrs(&nic->pdev->dev, dma_addr,
550                                              RCV_FRAG_LEN + XDP_PACKET_HEADROOM,
551                                              DMA_FROM_DEVICE,
552                                              DMA_ATTR_SKIP_CPU_SYNC);
553                 }
554
555                 /* Build SKB and pass on packet to network stack */
556                 *skb = build_skb(xdp.data,
557                                  RCV_FRAG_LEN - cqe_rx->align_pad + offset);
558                 if (!*skb)
559                         put_page(page);
560                 else
561                         skb_put(*skb, len);
562                 return false;
563         case XDP_TX:
564                 nicvf_xdp_sq_append_pkt(nic, sq, (u64)xdp.data, dma_addr, len);
565                 return true;
566         default:
567                 bpf_warn_invalid_xdp_action(action);
568                 /* fall through */
569         case XDP_ABORTED:
570                 trace_xdp_exception(nic->netdev, prog, action);
571                 /* fall through */
572         case XDP_DROP:
573                 /* Check if it's a recycled page, if not
574                  * unmap the DMA mapping.
575                  *
576                  * Recycled page holds an extra reference.
577                  */
578                 if (page_ref_count(page) == 1) {
579                         dma_addr &= PAGE_MASK;
580                         dma_unmap_page_attrs(&nic->pdev->dev, dma_addr,
581                                              RCV_FRAG_LEN + XDP_PACKET_HEADROOM,
582                                              DMA_FROM_DEVICE,
583                                              DMA_ATTR_SKIP_CPU_SYNC);
584                 }
585                 put_page(page);
586                 return true;
587         }
588         return false;
589 }
590
591 static void nicvf_snd_pkt_handler(struct net_device *netdev,
592                                   struct cqe_send_t *cqe_tx,
593                                   int budget, int *subdesc_cnt,
594                                   unsigned int *tx_pkts, unsigned int *tx_bytes)
595 {
596         struct sk_buff *skb = NULL;
597         struct page *page;
598         struct nicvf *nic = netdev_priv(netdev);
599         struct snd_queue *sq;
600         struct sq_hdr_subdesc *hdr;
601         struct sq_hdr_subdesc *tso_sqe;
602
603         sq = &nic->qs->sq[cqe_tx->sq_idx];
604
605         hdr = (struct sq_hdr_subdesc *)GET_SQ_DESC(sq, cqe_tx->sqe_ptr);
606         if (hdr->subdesc_type != SQ_DESC_TYPE_HEADER)
607                 return;
608
609         /* Check for errors */
610         if (cqe_tx->send_status)
611                 nicvf_check_cqe_tx_errs(nic->pnicvf, cqe_tx);
612
613         /* Is this a XDP designated Tx queue */
614         if (sq->is_xdp) {
615                 page = (struct page *)sq->xdp_page[cqe_tx->sqe_ptr];
616                 /* Check if it's recycled page or else unmap DMA mapping */
617                 if (page && (page_ref_count(page) == 1))
618                         nicvf_unmap_sndq_buffers(nic, sq, cqe_tx->sqe_ptr,
619                                                  hdr->subdesc_cnt);
620
621                 /* Release page reference for recycling */
622                 if (page)
623                         put_page(page);
624                 sq->xdp_page[cqe_tx->sqe_ptr] = (u64)NULL;
625                 *subdesc_cnt += hdr->subdesc_cnt + 1;
626                 return;
627         }
628
629         skb = (struct sk_buff *)sq->skbuff[cqe_tx->sqe_ptr];
630         if (skb) {
631                 /* Check for dummy descriptor used for HW TSO offload on 88xx */
632                 if (hdr->dont_send) {
633                         /* Get actual TSO descriptors and free them */
634                         tso_sqe =
635                          (struct sq_hdr_subdesc *)GET_SQ_DESC(sq, hdr->rsvd2);
636                         nicvf_unmap_sndq_buffers(nic, sq, hdr->rsvd2,
637                                                  tso_sqe->subdesc_cnt);
638                         *subdesc_cnt += tso_sqe->subdesc_cnt + 1;
639                 } else {
640                         nicvf_unmap_sndq_buffers(nic, sq, cqe_tx->sqe_ptr,
641                                                  hdr->subdesc_cnt);
642                 }
643                 *subdesc_cnt += hdr->subdesc_cnt + 1;
644                 prefetch(skb);
645                 (*tx_pkts)++;
646                 *tx_bytes += skb->len;
647                 napi_consume_skb(skb, budget);
648                 sq->skbuff[cqe_tx->sqe_ptr] = (u64)NULL;
649         } else {
650                 /* In case of SW TSO on 88xx, only last segment will have
651                  * a SKB attached, so just free SQEs here.
652                  */
653                 if (!nic->hw_tso)
654                         *subdesc_cnt += hdr->subdesc_cnt + 1;
655         }
656 }
657
658 static inline void nicvf_set_rxhash(struct net_device *netdev,
659                                     struct cqe_rx_t *cqe_rx,
660                                     struct sk_buff *skb)
661 {
662         u8 hash_type;
663         u32 hash;
664
665         if (!(netdev->features & NETIF_F_RXHASH))
666                 return;
667
668         switch (cqe_rx->rss_alg) {
669         case RSS_ALG_TCP_IP:
670         case RSS_ALG_UDP_IP:
671                 hash_type = PKT_HASH_TYPE_L4;
672                 hash = cqe_rx->rss_tag;
673                 break;
674         case RSS_ALG_IP:
675                 hash_type = PKT_HASH_TYPE_L3;
676                 hash = cqe_rx->rss_tag;
677                 break;
678         default:
679                 hash_type = PKT_HASH_TYPE_NONE;
680                 hash = 0;
681         }
682
683         skb_set_hash(skb, hash, hash_type);
684 }
685
686 static void nicvf_rcv_pkt_handler(struct net_device *netdev,
687                                   struct napi_struct *napi,
688                                   struct cqe_rx_t *cqe_rx, struct snd_queue *sq)
689 {
690         struct sk_buff *skb = NULL;
691         struct nicvf *nic = netdev_priv(netdev);
692         struct nicvf *snic = nic;
693         int err = 0;
694         int rq_idx;
695
696         rq_idx = nicvf_netdev_qidx(nic, cqe_rx->rq_idx);
697
698         if (nic->sqs_mode) {
699                 /* Use primary VF's 'nicvf' struct */
700                 nic = nic->pnicvf;
701                 netdev = nic->netdev;
702         }
703
704         /* Check for errors */
705         if (cqe_rx->err_level || cqe_rx->err_opcode) {
706                 err = nicvf_check_cqe_rx_errs(nic, cqe_rx);
707                 if (err && !cqe_rx->rb_cnt)
708                         return;
709         }
710
711         /* For XDP, ignore pkts spanning multiple pages */
712         if (nic->xdp_prog && (cqe_rx->rb_cnt == 1)) {
713                 /* Packet consumed by XDP */
714                 if (nicvf_xdp_rx(snic, nic->xdp_prog, cqe_rx, sq, &skb))
715                         return;
716         } else {
717                 skb = nicvf_get_rcv_skb(snic, cqe_rx,
718                                         nic->xdp_prog ? true : false);
719         }
720
721         if (!skb)
722                 return;
723
724         if (netif_msg_pktdata(nic)) {
725                 netdev_info(nic->netdev, "skb 0x%p, len=%d\n", skb, skb->len);
726                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_OFFSET, 16, 1,
727                                skb->data, skb->len, true);
728         }
729
730         /* If error packet, drop it here */
731         if (err) {
732                 dev_kfree_skb_any(skb);
733                 return;
734         }
735
736         nicvf_set_rxhash(netdev, cqe_rx, skb);
737
738         skb_record_rx_queue(skb, rq_idx);
739         if (netdev->hw_features & NETIF_F_RXCSUM) {
740                 /* HW by default verifies TCP/UDP/SCTP checksums */
741                 skb->ip_summed = CHECKSUM_UNNECESSARY;
742         } else {
743                 skb_checksum_none_assert(skb);
744         }
745
746         skb->protocol = eth_type_trans(skb, netdev);
747
748         /* Check for stripped VLAN */
749         if (cqe_rx->vlan_found && cqe_rx->vlan_stripped)
750                 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
751                                        ntohs((__force __be16)cqe_rx->vlan_tci));
752
753         if (napi && (netdev->features & NETIF_F_GRO))
754                 napi_gro_receive(napi, skb);
755         else
756                 netif_receive_skb(skb);
757 }
758
759 static int nicvf_cq_intr_handler(struct net_device *netdev, u8 cq_idx,
760                                  struct napi_struct *napi, int budget)
761 {
762         int processed_cqe, work_done = 0, tx_done = 0;
763         int cqe_count, cqe_head;
764         int subdesc_cnt = 0;
765         struct nicvf *nic = netdev_priv(netdev);
766         struct queue_set *qs = nic->qs;
767         struct cmp_queue *cq = &qs->cq[cq_idx];
768         struct cqe_rx_t *cq_desc;
769         struct netdev_queue *txq;
770         struct snd_queue *sq = &qs->sq[cq_idx];
771         unsigned int tx_pkts = 0, tx_bytes = 0, txq_idx;
772
773         spin_lock_bh(&cq->lock);
774 loop:
775         processed_cqe = 0;
776         /* Get no of valid CQ entries to process */
777         cqe_count = nicvf_queue_reg_read(nic, NIC_QSET_CQ_0_7_STATUS, cq_idx);
778         cqe_count &= CQ_CQE_COUNT;
779         if (!cqe_count)
780                 goto done;
781
782         /* Get head of the valid CQ entries */
783         cqe_head = nicvf_queue_reg_read(nic, NIC_QSET_CQ_0_7_HEAD, cq_idx) >> 9;
784         cqe_head &= 0xFFFF;
785
786         while (processed_cqe < cqe_count) {
787                 /* Get the CQ descriptor */
788                 cq_desc = (struct cqe_rx_t *)GET_CQ_DESC(cq, cqe_head);
789                 cqe_head++;
790                 cqe_head &= (cq->dmem.q_len - 1);
791                 /* Initiate prefetch for next descriptor */
792                 prefetch((struct cqe_rx_t *)GET_CQ_DESC(cq, cqe_head));
793
794                 if ((work_done >= budget) && napi &&
795                     (cq_desc->cqe_type != CQE_TYPE_SEND)) {
796                         break;
797                 }
798
799                 switch (cq_desc->cqe_type) {
800                 case CQE_TYPE_RX:
801                         nicvf_rcv_pkt_handler(netdev, napi, cq_desc, sq);
802                         work_done++;
803                 break;
804                 case CQE_TYPE_SEND:
805                         nicvf_snd_pkt_handler(netdev, (void *)cq_desc,
806                                               budget, &subdesc_cnt,
807                                               &tx_pkts, &tx_bytes);
808                         tx_done++;
809                 break;
810                 case CQE_TYPE_INVALID:
811                 case CQE_TYPE_RX_SPLIT:
812                 case CQE_TYPE_RX_TCP:
813                 case CQE_TYPE_SEND_PTP:
814                         /* Ignore for now */
815                 break;
816                 }
817                 processed_cqe++;
818         }
819
820         /* Ring doorbell to inform H/W to reuse processed CQEs */
821         nicvf_queue_reg_write(nic, NIC_QSET_CQ_0_7_DOOR,
822                               cq_idx, processed_cqe);
823
824         if ((work_done < budget) && napi)
825                 goto loop;
826
827 done:
828         /* Update SQ's descriptor free count */
829         if (subdesc_cnt)
830                 nicvf_put_sq_desc(sq, subdesc_cnt);
831
832         txq_idx = nicvf_netdev_qidx(nic, cq_idx);
833         /* Handle XDP TX queues */
834         if (nic->pnicvf->xdp_prog) {
835                 if (txq_idx < nic->pnicvf->xdp_tx_queues) {
836                         nicvf_xdp_sq_doorbell(nic, sq, cq_idx);
837                         goto out;
838                 }
839                 nic = nic->pnicvf;
840                 txq_idx -= nic->pnicvf->xdp_tx_queues;
841         }
842
843         /* Wakeup TXQ if its stopped earlier due to SQ full */
844         if (tx_done ||
845             (atomic_read(&sq->free_cnt) >= MIN_SQ_DESC_PER_PKT_XMIT)) {
846                 netdev = nic->pnicvf->netdev;
847                 txq = netdev_get_tx_queue(netdev, txq_idx);
848                 if (tx_pkts)
849                         netdev_tx_completed_queue(txq, tx_pkts, tx_bytes);
850
851                 /* To read updated queue and carrier status */
852                 smp_mb();
853                 if (netif_tx_queue_stopped(txq) && netif_carrier_ok(netdev)) {
854                         netif_tx_wake_queue(txq);
855                         nic = nic->pnicvf;
856                         this_cpu_inc(nic->drv_stats->txq_wake);
857                         netif_warn(nic, tx_err, netdev,
858                                    "Transmit queue wakeup SQ%d\n", txq_idx);
859                 }
860         }
861
862 out:
863         spin_unlock_bh(&cq->lock);
864         return work_done;
865 }
866
867 static int nicvf_poll(struct napi_struct *napi, int budget)
868 {
869         u64  cq_head;
870         int  work_done = 0;
871         struct net_device *netdev = napi->dev;
872         struct nicvf *nic = netdev_priv(netdev);
873         struct nicvf_cq_poll *cq;
874
875         cq = container_of(napi, struct nicvf_cq_poll, napi);
876         work_done = nicvf_cq_intr_handler(netdev, cq->cq_idx, napi, budget);
877
878         if (work_done < budget) {
879                 /* Slow packet rate, exit polling */
880                 napi_complete_done(napi, work_done);
881                 /* Re-enable interrupts */
882                 cq_head = nicvf_queue_reg_read(nic, NIC_QSET_CQ_0_7_HEAD,
883                                                cq->cq_idx);
884                 nicvf_clear_intr(nic, NICVF_INTR_CQ, cq->cq_idx);
885                 nicvf_queue_reg_write(nic, NIC_QSET_CQ_0_7_HEAD,
886                                       cq->cq_idx, cq_head);
887                 nicvf_enable_intr(nic, NICVF_INTR_CQ, cq->cq_idx);
888         }
889         return work_done;
890 }
891
892 /* Qset error interrupt handler
893  *
894  * As of now only CQ errors are handled
895  */
896 static void nicvf_handle_qs_err(unsigned long data)
897 {
898         struct nicvf *nic = (struct nicvf *)data;
899         struct queue_set *qs = nic->qs;
900         int qidx;
901         u64 status;
902
903         netif_tx_disable(nic->netdev);
904
905         /* Check if it is CQ err */
906         for (qidx = 0; qidx < qs->cq_cnt; qidx++) {
907                 status = nicvf_queue_reg_read(nic, NIC_QSET_CQ_0_7_STATUS,
908                                               qidx);
909                 if (!(status & CQ_ERR_MASK))
910                         continue;
911                 /* Process already queued CQEs and reconfig CQ */
912                 nicvf_disable_intr(nic, NICVF_INTR_CQ, qidx);
913                 nicvf_sq_disable(nic, qidx);
914                 nicvf_cq_intr_handler(nic->netdev, qidx, NULL, 0);
915                 nicvf_cmp_queue_config(nic, qs, qidx, true);
916                 nicvf_sq_free_used_descs(nic->netdev, &qs->sq[qidx], qidx);
917                 nicvf_sq_enable(nic, &qs->sq[qidx], qidx);
918
919                 nicvf_enable_intr(nic, NICVF_INTR_CQ, qidx);
920         }
921
922         netif_tx_start_all_queues(nic->netdev);
923         /* Re-enable Qset error interrupt */
924         nicvf_enable_intr(nic, NICVF_INTR_QS_ERR, 0);
925 }
926
927 static void nicvf_dump_intr_status(struct nicvf *nic)
928 {
929         netif_info(nic, intr, nic->netdev, "interrupt status 0x%llx\n",
930                    nicvf_reg_read(nic, NIC_VF_INT));
931 }
932
933 static irqreturn_t nicvf_misc_intr_handler(int irq, void *nicvf_irq)
934 {
935         struct nicvf *nic = (struct nicvf *)nicvf_irq;
936         u64 intr;
937
938         nicvf_dump_intr_status(nic);
939
940         intr = nicvf_reg_read(nic, NIC_VF_INT);
941         /* Check for spurious interrupt */
942         if (!(intr & NICVF_INTR_MBOX_MASK))
943                 return IRQ_HANDLED;
944
945         nicvf_handle_mbx_intr(nic);
946
947         return IRQ_HANDLED;
948 }
949
950 static irqreturn_t nicvf_intr_handler(int irq, void *cq_irq)
951 {
952         struct nicvf_cq_poll *cq_poll = (struct nicvf_cq_poll *)cq_irq;
953         struct nicvf *nic = cq_poll->nicvf;
954         int qidx = cq_poll->cq_idx;
955
956         nicvf_dump_intr_status(nic);
957
958         /* Disable interrupts */
959         nicvf_disable_intr(nic, NICVF_INTR_CQ, qidx);
960
961         /* Schedule NAPI */
962         napi_schedule_irqoff(&cq_poll->napi);
963
964         /* Clear interrupt */
965         nicvf_clear_intr(nic, NICVF_INTR_CQ, qidx);
966
967         return IRQ_HANDLED;
968 }
969
970 static irqreturn_t nicvf_rbdr_intr_handler(int irq, void *nicvf_irq)
971 {
972         struct nicvf *nic = (struct nicvf *)nicvf_irq;
973         u8 qidx;
974
975
976         nicvf_dump_intr_status(nic);
977
978         /* Disable RBDR interrupt and schedule softirq */
979         for (qidx = 0; qidx < nic->qs->rbdr_cnt; qidx++) {
980                 if (!nicvf_is_intr_enabled(nic, NICVF_INTR_RBDR, qidx))
981                         continue;
982                 nicvf_disable_intr(nic, NICVF_INTR_RBDR, qidx);
983                 tasklet_hi_schedule(&nic->rbdr_task);
984                 /* Clear interrupt */
985                 nicvf_clear_intr(nic, NICVF_INTR_RBDR, qidx);
986         }
987
988         return IRQ_HANDLED;
989 }
990
991 static irqreturn_t nicvf_qs_err_intr_handler(int irq, void *nicvf_irq)
992 {
993         struct nicvf *nic = (struct nicvf *)nicvf_irq;
994
995         nicvf_dump_intr_status(nic);
996
997         /* Disable Qset err interrupt and schedule softirq */
998         nicvf_disable_intr(nic, NICVF_INTR_QS_ERR, 0);
999         tasklet_hi_schedule(&nic->qs_err_task);
1000         nicvf_clear_intr(nic, NICVF_INTR_QS_ERR, 0);
1001
1002         return IRQ_HANDLED;
1003 }
1004
1005 static void nicvf_set_irq_affinity(struct nicvf *nic)
1006 {
1007         int vec, cpu;
1008
1009         for (vec = 0; vec < nic->num_vec; vec++) {
1010                 if (!nic->irq_allocated[vec])
1011                         continue;
1012
1013                 if (!zalloc_cpumask_var(&nic->affinity_mask[vec], GFP_KERNEL))
1014                         return;
1015                  /* CQ interrupts */
1016                 if (vec < NICVF_INTR_ID_SQ)
1017                         /* Leave CPU0 for RBDR and other interrupts */
1018                         cpu = nicvf_netdev_qidx(nic, vec) + 1;
1019                 else
1020                         cpu = 0;
1021
1022                 cpumask_set_cpu(cpumask_local_spread(cpu, nic->node),
1023                                 nic->affinity_mask[vec]);
1024                 irq_set_affinity_hint(pci_irq_vector(nic->pdev, vec),
1025                                       nic->affinity_mask[vec]);
1026         }
1027 }
1028
1029 static int nicvf_register_interrupts(struct nicvf *nic)
1030 {
1031         int irq, ret = 0;
1032
1033         for_each_cq_irq(irq)
1034                 sprintf(nic->irq_name[irq], "%s-rxtx-%d",
1035                         nic->pnicvf->netdev->name,
1036                         nicvf_netdev_qidx(nic, irq));
1037
1038         for_each_sq_irq(irq)
1039                 sprintf(nic->irq_name[irq], "%s-sq-%d",
1040                         nic->pnicvf->netdev->name,
1041                         nicvf_netdev_qidx(nic, irq - NICVF_INTR_ID_SQ));
1042
1043         for_each_rbdr_irq(irq)
1044                 sprintf(nic->irq_name[irq], "%s-rbdr-%d",
1045                         nic->pnicvf->netdev->name,
1046                         nic->sqs_mode ? (nic->sqs_id + 1) : 0);
1047
1048         /* Register CQ interrupts */
1049         for (irq = 0; irq < nic->qs->cq_cnt; irq++) {
1050                 ret = request_irq(pci_irq_vector(nic->pdev, irq),
1051                                   nicvf_intr_handler,
1052                                   0, nic->irq_name[irq], nic->napi[irq]);
1053                 if (ret)
1054                         goto err;
1055                 nic->irq_allocated[irq] = true;
1056         }
1057
1058         /* Register RBDR interrupt */
1059         for (irq = NICVF_INTR_ID_RBDR;
1060              irq < (NICVF_INTR_ID_RBDR + nic->qs->rbdr_cnt); irq++) {
1061                 ret = request_irq(pci_irq_vector(nic->pdev, irq),
1062                                   nicvf_rbdr_intr_handler,
1063                                   0, nic->irq_name[irq], nic);
1064                 if (ret)
1065                         goto err;
1066                 nic->irq_allocated[irq] = true;
1067         }
1068
1069         /* Register QS error interrupt */
1070         sprintf(nic->irq_name[NICVF_INTR_ID_QS_ERR], "%s-qset-err-%d",
1071                 nic->pnicvf->netdev->name,
1072                 nic->sqs_mode ? (nic->sqs_id + 1) : 0);
1073         irq = NICVF_INTR_ID_QS_ERR;
1074         ret = request_irq(pci_irq_vector(nic->pdev, irq),
1075                           nicvf_qs_err_intr_handler,
1076                           0, nic->irq_name[irq], nic);
1077         if (ret)
1078                 goto err;
1079
1080         nic->irq_allocated[irq] = true;
1081
1082         /* Set IRQ affinities */
1083         nicvf_set_irq_affinity(nic);
1084
1085 err:
1086         if (ret)
1087                 netdev_err(nic->netdev, "request_irq failed, vector %d\n", irq);
1088
1089         return ret;
1090 }
1091
1092 static void nicvf_unregister_interrupts(struct nicvf *nic)
1093 {
1094         struct pci_dev *pdev = nic->pdev;
1095         int irq;
1096
1097         /* Free registered interrupts */
1098         for (irq = 0; irq < nic->num_vec; irq++) {
1099                 if (!nic->irq_allocated[irq])
1100                         continue;
1101
1102                 irq_set_affinity_hint(pci_irq_vector(pdev, irq), NULL);
1103                 free_cpumask_var(nic->affinity_mask[irq]);
1104
1105                 if (irq < NICVF_INTR_ID_SQ)
1106                         free_irq(pci_irq_vector(pdev, irq), nic->napi[irq]);
1107                 else
1108                         free_irq(pci_irq_vector(pdev, irq), nic);
1109
1110                 nic->irq_allocated[irq] = false;
1111         }
1112
1113         /* Disable MSI-X */
1114         pci_free_irq_vectors(pdev);
1115         nic->num_vec = 0;
1116 }
1117
1118 /* Initialize MSIX vectors and register MISC interrupt.
1119  * Send READY message to PF to check if its alive
1120  */
1121 static int nicvf_register_misc_interrupt(struct nicvf *nic)
1122 {
1123         int ret = 0;
1124         int irq = NICVF_INTR_ID_MISC;
1125
1126         /* Return if mailbox interrupt is already registered */
1127         if (nic->pdev->msix_enabled)
1128                 return 0;
1129
1130         /* Enable MSI-X */
1131         nic->num_vec = pci_msix_vec_count(nic->pdev);
1132         ret = pci_alloc_irq_vectors(nic->pdev, nic->num_vec, nic->num_vec,
1133                                     PCI_IRQ_MSIX);
1134         if (ret < 0) {
1135                 netdev_err(nic->netdev,
1136                            "Req for #%d msix vectors failed\n", nic->num_vec);
1137                 return 1;
1138         }
1139
1140         sprintf(nic->irq_name[irq], "%s Mbox", "NICVF");
1141         /* Register Misc interrupt */
1142         ret = request_irq(pci_irq_vector(nic->pdev, irq),
1143                           nicvf_misc_intr_handler, 0, nic->irq_name[irq], nic);
1144
1145         if (ret)
1146                 return ret;
1147         nic->irq_allocated[irq] = true;
1148
1149         /* Enable mailbox interrupt */
1150         nicvf_enable_intr(nic, NICVF_INTR_MBOX, 0);
1151
1152         /* Check if VF is able to communicate with PF */
1153         if (!nicvf_check_pf_ready(nic)) {
1154                 nicvf_disable_intr(nic, NICVF_INTR_MBOX, 0);
1155                 nicvf_unregister_interrupts(nic);
1156                 return 1;
1157         }
1158
1159         return 0;
1160 }
1161
1162 static netdev_tx_t nicvf_xmit(struct sk_buff *skb, struct net_device *netdev)
1163 {
1164         struct nicvf *nic = netdev_priv(netdev);
1165         int qid = skb_get_queue_mapping(skb);
1166         struct netdev_queue *txq = netdev_get_tx_queue(netdev, qid);
1167         struct nicvf *snic;
1168         struct snd_queue *sq;
1169         int tmp;
1170
1171         /* Check for minimum packet length */
1172         if (skb->len <= ETH_HLEN) {
1173                 dev_kfree_skb(skb);
1174                 return NETDEV_TX_OK;
1175         }
1176
1177         /* In XDP case, initial HW tx queues are used for XDP,
1178          * but stack's queue mapping starts at '0', so skip the
1179          * Tx queues attached to Rx queues for XDP.
1180          */
1181         if (nic->xdp_prog)
1182                 qid += nic->xdp_tx_queues;
1183
1184         snic = nic;
1185         /* Get secondary Qset's SQ structure */
1186         if (qid >= MAX_SND_QUEUES_PER_QS) {
1187                 tmp = qid / MAX_SND_QUEUES_PER_QS;
1188                 snic = (struct nicvf *)nic->snicvf[tmp - 1];
1189                 if (!snic) {
1190                         netdev_warn(nic->netdev,
1191                                     "Secondary Qset#%d's ptr not initialized\n",
1192                                     tmp - 1);
1193                         dev_kfree_skb(skb);
1194                         return NETDEV_TX_OK;
1195                 }
1196                 qid = qid % MAX_SND_QUEUES_PER_QS;
1197         }
1198
1199         sq = &snic->qs->sq[qid];
1200         if (!netif_tx_queue_stopped(txq) &&
1201             !nicvf_sq_append_skb(snic, sq, skb, qid)) {
1202                 netif_tx_stop_queue(txq);
1203
1204                 /* Barrier, so that stop_queue visible to other cpus */
1205                 smp_mb();
1206
1207                 /* Check again, incase another cpu freed descriptors */
1208                 if (atomic_read(&sq->free_cnt) > MIN_SQ_DESC_PER_PKT_XMIT) {
1209                         netif_tx_wake_queue(txq);
1210                 } else {
1211                         this_cpu_inc(nic->drv_stats->txq_stop);
1212                         netif_warn(nic, tx_err, netdev,
1213                                    "Transmit ring full, stopping SQ%d\n", qid);
1214                 }
1215                 return NETDEV_TX_BUSY;
1216         }
1217
1218         return NETDEV_TX_OK;
1219 }
1220
1221 static inline void nicvf_free_cq_poll(struct nicvf *nic)
1222 {
1223         struct nicvf_cq_poll *cq_poll;
1224         int qidx;
1225
1226         for (qidx = 0; qidx < nic->qs->cq_cnt; qidx++) {
1227                 cq_poll = nic->napi[qidx];
1228                 if (!cq_poll)
1229                         continue;
1230                 nic->napi[qidx] = NULL;
1231                 kfree(cq_poll);
1232         }
1233 }
1234
1235 int nicvf_stop(struct net_device *netdev)
1236 {
1237         int irq, qidx;
1238         struct nicvf *nic = netdev_priv(netdev);
1239         struct queue_set *qs = nic->qs;
1240         struct nicvf_cq_poll *cq_poll = NULL;
1241         union nic_mbx mbx = {};
1242
1243         mbx.msg.msg = NIC_MBOX_MSG_SHUTDOWN;
1244         nicvf_send_msg_to_pf(nic, &mbx);
1245
1246         netif_carrier_off(netdev);
1247         netif_tx_stop_all_queues(nic->netdev);
1248         nic->link_up = false;
1249
1250         /* Teardown secondary qsets first */
1251         if (!nic->sqs_mode) {
1252                 for (qidx = 0; qidx < nic->sqs_count; qidx++) {
1253                         if (!nic->snicvf[qidx])
1254                                 continue;
1255                         nicvf_stop(nic->snicvf[qidx]->netdev);
1256                         nic->snicvf[qidx] = NULL;
1257                 }
1258         }
1259
1260         /* Disable RBDR & QS error interrupts */
1261         for (qidx = 0; qidx < qs->rbdr_cnt; qidx++) {
1262                 nicvf_disable_intr(nic, NICVF_INTR_RBDR, qidx);
1263                 nicvf_clear_intr(nic, NICVF_INTR_RBDR, qidx);
1264         }
1265         nicvf_disable_intr(nic, NICVF_INTR_QS_ERR, 0);
1266         nicvf_clear_intr(nic, NICVF_INTR_QS_ERR, 0);
1267
1268         /* Wait for pending IRQ handlers to finish */
1269         for (irq = 0; irq < nic->num_vec; irq++)
1270                 synchronize_irq(pci_irq_vector(nic->pdev, irq));
1271
1272         tasklet_kill(&nic->rbdr_task);
1273         tasklet_kill(&nic->qs_err_task);
1274         if (nic->rb_work_scheduled)
1275                 cancel_delayed_work_sync(&nic->rbdr_work);
1276
1277         for (qidx = 0; qidx < nic->qs->cq_cnt; qidx++) {
1278                 cq_poll = nic->napi[qidx];
1279                 if (!cq_poll)
1280                         continue;
1281                 napi_synchronize(&cq_poll->napi);
1282                 /* CQ intr is enabled while napi_complete,
1283                  * so disable it now
1284                  */
1285                 nicvf_disable_intr(nic, NICVF_INTR_CQ, qidx);
1286                 nicvf_clear_intr(nic, NICVF_INTR_CQ, qidx);
1287                 napi_disable(&cq_poll->napi);
1288                 netif_napi_del(&cq_poll->napi);
1289         }
1290
1291         netif_tx_disable(netdev);
1292
1293         for (qidx = 0; qidx < netdev->num_tx_queues; qidx++)
1294                 netdev_tx_reset_queue(netdev_get_tx_queue(netdev, qidx));
1295
1296         /* Free resources */
1297         nicvf_config_data_transfer(nic, false);
1298
1299         /* Disable HW Qset */
1300         nicvf_qset_config(nic, false);
1301
1302         /* disable mailbox interrupt */
1303         nicvf_disable_intr(nic, NICVF_INTR_MBOX, 0);
1304
1305         nicvf_unregister_interrupts(nic);
1306
1307         nicvf_free_cq_poll(nic);
1308
1309         /* Clear multiqset info */
1310         nic->pnicvf = nic;
1311
1312         return 0;
1313 }
1314
1315 static int nicvf_update_hw_max_frs(struct nicvf *nic, int mtu)
1316 {
1317         union nic_mbx mbx = {};
1318
1319         mbx.frs.msg = NIC_MBOX_MSG_SET_MAX_FRS;
1320         mbx.frs.max_frs = mtu;
1321         mbx.frs.vf_id = nic->vf_id;
1322
1323         return nicvf_send_msg_to_pf(nic, &mbx);
1324 }
1325
1326 int nicvf_open(struct net_device *netdev)
1327 {
1328         int cpu, err, qidx;
1329         struct nicvf *nic = netdev_priv(netdev);
1330         struct queue_set *qs = nic->qs;
1331         struct nicvf_cq_poll *cq_poll = NULL;
1332         union nic_mbx mbx = {};
1333
1334         netif_carrier_off(netdev);
1335
1336         err = nicvf_register_misc_interrupt(nic);
1337         if (err)
1338                 return err;
1339
1340         /* Register NAPI handler for processing CQEs */
1341         for (qidx = 0; qidx < qs->cq_cnt; qidx++) {
1342                 cq_poll = kzalloc(sizeof(*cq_poll), GFP_KERNEL);
1343                 if (!cq_poll) {
1344                         err = -ENOMEM;
1345                         goto napi_del;
1346                 }
1347                 cq_poll->cq_idx = qidx;
1348                 cq_poll->nicvf = nic;
1349                 netif_napi_add(netdev, &cq_poll->napi, nicvf_poll,
1350                                NAPI_POLL_WEIGHT);
1351                 napi_enable(&cq_poll->napi);
1352                 nic->napi[qidx] = cq_poll;
1353         }
1354
1355         /* Check if we got MAC address from PF or else generate a radom MAC */
1356         if (!nic->sqs_mode && is_zero_ether_addr(netdev->dev_addr)) {
1357                 eth_hw_addr_random(netdev);
1358                 nicvf_hw_set_mac_addr(nic, netdev);
1359         }
1360
1361         if (nic->set_mac_pending) {
1362                 nic->set_mac_pending = false;
1363                 nicvf_hw_set_mac_addr(nic, netdev);
1364         }
1365
1366         /* Init tasklet for handling Qset err interrupt */
1367         tasklet_init(&nic->qs_err_task, nicvf_handle_qs_err,
1368                      (unsigned long)nic);
1369
1370         /* Init RBDR tasklet which will refill RBDR */
1371         tasklet_init(&nic->rbdr_task, nicvf_rbdr_task,
1372                      (unsigned long)nic);
1373         INIT_DELAYED_WORK(&nic->rbdr_work, nicvf_rbdr_work);
1374
1375         /* Configure CPI alorithm */
1376         nic->cpi_alg = cpi_alg;
1377         if (!nic->sqs_mode)
1378                 nicvf_config_cpi(nic);
1379
1380         nicvf_request_sqs(nic);
1381         if (nic->sqs_mode)
1382                 nicvf_get_primary_vf_struct(nic);
1383
1384         /* Configure receive side scaling and MTU */
1385         if (!nic->sqs_mode) {
1386                 nicvf_rss_init(nic);
1387                 err = nicvf_update_hw_max_frs(nic, netdev->mtu);
1388                 if (err)
1389                         goto cleanup;
1390
1391                 /* Clear percpu stats */
1392                 for_each_possible_cpu(cpu)
1393                         memset(per_cpu_ptr(nic->drv_stats, cpu), 0,
1394                                sizeof(struct nicvf_drv_stats));
1395         }
1396
1397         err = nicvf_register_interrupts(nic);
1398         if (err)
1399                 goto cleanup;
1400
1401         /* Initialize the queues */
1402         err = nicvf_init_resources(nic);
1403         if (err)
1404                 goto cleanup;
1405
1406         /* Make sure queue initialization is written */
1407         wmb();
1408
1409         nicvf_reg_write(nic, NIC_VF_INT, -1);
1410         /* Enable Qset err interrupt */
1411         nicvf_enable_intr(nic, NICVF_INTR_QS_ERR, 0);
1412
1413         /* Enable completion queue interrupt */
1414         for (qidx = 0; qidx < qs->cq_cnt; qidx++)
1415                 nicvf_enable_intr(nic, NICVF_INTR_CQ, qidx);
1416
1417         /* Enable RBDR threshold interrupt */
1418         for (qidx = 0; qidx < qs->rbdr_cnt; qidx++)
1419                 nicvf_enable_intr(nic, NICVF_INTR_RBDR, qidx);
1420
1421         /* Send VF config done msg to PF */
1422         mbx.msg.msg = NIC_MBOX_MSG_CFG_DONE;
1423         nicvf_write_to_mbx(nic, &mbx);
1424
1425         return 0;
1426 cleanup:
1427         nicvf_disable_intr(nic, NICVF_INTR_MBOX, 0);
1428         nicvf_unregister_interrupts(nic);
1429         tasklet_kill(&nic->qs_err_task);
1430         tasklet_kill(&nic->rbdr_task);
1431 napi_del:
1432         for (qidx = 0; qidx < qs->cq_cnt; qidx++) {
1433                 cq_poll = nic->napi[qidx];
1434                 if (!cq_poll)
1435                         continue;
1436                 napi_disable(&cq_poll->napi);
1437                 netif_napi_del(&cq_poll->napi);
1438         }
1439         nicvf_free_cq_poll(nic);
1440         return err;
1441 }
1442
1443 static int nicvf_change_mtu(struct net_device *netdev, int new_mtu)
1444 {
1445         struct nicvf *nic = netdev_priv(netdev);
1446         int orig_mtu = netdev->mtu;
1447
1448         netdev->mtu = new_mtu;
1449
1450         if (!netif_running(netdev))
1451                 return 0;
1452
1453         if (nicvf_update_hw_max_frs(nic, new_mtu)) {
1454                 netdev->mtu = orig_mtu;
1455                 return -EINVAL;
1456         }
1457
1458         return 0;
1459 }
1460
1461 static int nicvf_set_mac_address(struct net_device *netdev, void *p)
1462 {
1463         struct sockaddr *addr = p;
1464         struct nicvf *nic = netdev_priv(netdev);
1465
1466         if (!is_valid_ether_addr(addr->sa_data))
1467                 return -EADDRNOTAVAIL;
1468
1469         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1470
1471         if (nic->pdev->msix_enabled) {
1472                 if (nicvf_hw_set_mac_addr(nic, netdev))
1473                         return -EBUSY;
1474         } else {
1475                 nic->set_mac_pending = true;
1476         }
1477
1478         return 0;
1479 }
1480
1481 void nicvf_update_lmac_stats(struct nicvf *nic)
1482 {
1483         int stat = 0;
1484         union nic_mbx mbx = {};
1485
1486         if (!netif_running(nic->netdev))
1487                 return;
1488
1489         mbx.bgx_stats.msg = NIC_MBOX_MSG_BGX_STATS;
1490         mbx.bgx_stats.vf_id = nic->vf_id;
1491         /* Rx stats */
1492         mbx.bgx_stats.rx = 1;
1493         while (stat < BGX_RX_STATS_COUNT) {
1494                 mbx.bgx_stats.idx = stat;
1495                 if (nicvf_send_msg_to_pf(nic, &mbx))
1496                         return;
1497                 stat++;
1498         }
1499
1500         stat = 0;
1501
1502         /* Tx stats */
1503         mbx.bgx_stats.rx = 0;
1504         while (stat < BGX_TX_STATS_COUNT) {
1505                 mbx.bgx_stats.idx = stat;
1506                 if (nicvf_send_msg_to_pf(nic, &mbx))
1507                         return;
1508                 stat++;
1509         }
1510 }
1511
1512 void nicvf_update_stats(struct nicvf *nic)
1513 {
1514         int qidx, cpu;
1515         u64 tmp_stats = 0;
1516         struct nicvf_hw_stats *stats = &nic->hw_stats;
1517         struct nicvf_drv_stats *drv_stats;
1518         struct queue_set *qs = nic->qs;
1519
1520 #define GET_RX_STATS(reg) \
1521         nicvf_reg_read(nic, NIC_VNIC_RX_STAT_0_13 | (reg << 3))
1522 #define GET_TX_STATS(reg) \
1523         nicvf_reg_read(nic, NIC_VNIC_TX_STAT_0_4 | (reg << 3))
1524
1525         stats->rx_bytes = GET_RX_STATS(RX_OCTS);
1526         stats->rx_ucast_frames = GET_RX_STATS(RX_UCAST);
1527         stats->rx_bcast_frames = GET_RX_STATS(RX_BCAST);
1528         stats->rx_mcast_frames = GET_RX_STATS(RX_MCAST);
1529         stats->rx_fcs_errors = GET_RX_STATS(RX_FCS);
1530         stats->rx_l2_errors = GET_RX_STATS(RX_L2ERR);
1531         stats->rx_drop_red = GET_RX_STATS(RX_RED);
1532         stats->rx_drop_red_bytes = GET_RX_STATS(RX_RED_OCTS);
1533         stats->rx_drop_overrun = GET_RX_STATS(RX_ORUN);
1534         stats->rx_drop_overrun_bytes = GET_RX_STATS(RX_ORUN_OCTS);
1535         stats->rx_drop_bcast = GET_RX_STATS(RX_DRP_BCAST);
1536         stats->rx_drop_mcast = GET_RX_STATS(RX_DRP_MCAST);
1537         stats->rx_drop_l3_bcast = GET_RX_STATS(RX_DRP_L3BCAST);
1538         stats->rx_drop_l3_mcast = GET_RX_STATS(RX_DRP_L3MCAST);
1539
1540         stats->tx_bytes = GET_TX_STATS(TX_OCTS);
1541         stats->tx_ucast_frames = GET_TX_STATS(TX_UCAST);
1542         stats->tx_bcast_frames = GET_TX_STATS(TX_BCAST);
1543         stats->tx_mcast_frames = GET_TX_STATS(TX_MCAST);
1544         stats->tx_drops = GET_TX_STATS(TX_DROP);
1545
1546         /* On T88 pass 2.0, the dummy SQE added for TSO notification
1547          * via CQE has 'dont_send' set. Hence HW drops the pkt pointed
1548          * pointed by dummy SQE and results in tx_drops counter being
1549          * incremented. Subtracting it from tx_tso counter will give
1550          * exact tx_drops counter.
1551          */
1552         if (nic->t88 && nic->hw_tso) {
1553                 for_each_possible_cpu(cpu) {
1554                         drv_stats = per_cpu_ptr(nic->drv_stats, cpu);
1555                         tmp_stats += drv_stats->tx_tso;
1556                 }
1557                 stats->tx_drops = tmp_stats - stats->tx_drops;
1558         }
1559         stats->tx_frames = stats->tx_ucast_frames +
1560                            stats->tx_bcast_frames +
1561                            stats->tx_mcast_frames;
1562         stats->rx_frames = stats->rx_ucast_frames +
1563                            stats->rx_bcast_frames +
1564                            stats->rx_mcast_frames;
1565         stats->rx_drops = stats->rx_drop_red +
1566                           stats->rx_drop_overrun;
1567
1568         /* Update RQ and SQ stats */
1569         for (qidx = 0; qidx < qs->rq_cnt; qidx++)
1570                 nicvf_update_rq_stats(nic, qidx);
1571         for (qidx = 0; qidx < qs->sq_cnt; qidx++)
1572                 nicvf_update_sq_stats(nic, qidx);
1573 }
1574
1575 static void nicvf_get_stats64(struct net_device *netdev,
1576                               struct rtnl_link_stats64 *stats)
1577 {
1578         struct nicvf *nic = netdev_priv(netdev);
1579         struct nicvf_hw_stats *hw_stats = &nic->hw_stats;
1580
1581         nicvf_update_stats(nic);
1582
1583         stats->rx_bytes = hw_stats->rx_bytes;
1584         stats->rx_packets = hw_stats->rx_frames;
1585         stats->rx_dropped = hw_stats->rx_drops;
1586         stats->multicast = hw_stats->rx_mcast_frames;
1587
1588         stats->tx_bytes = hw_stats->tx_bytes;
1589         stats->tx_packets = hw_stats->tx_frames;
1590         stats->tx_dropped = hw_stats->tx_drops;
1591
1592 }
1593
1594 static void nicvf_tx_timeout(struct net_device *dev)
1595 {
1596         struct nicvf *nic = netdev_priv(dev);
1597
1598         netif_warn(nic, tx_err, dev, "Transmit timed out, resetting\n");
1599
1600         this_cpu_inc(nic->drv_stats->tx_timeout);
1601         schedule_work(&nic->reset_task);
1602 }
1603
1604 static void nicvf_reset_task(struct work_struct *work)
1605 {
1606         struct nicvf *nic;
1607
1608         nic = container_of(work, struct nicvf, reset_task);
1609
1610         if (!netif_running(nic->netdev))
1611                 return;
1612
1613         nicvf_stop(nic->netdev);
1614         nicvf_open(nic->netdev);
1615         netif_trans_update(nic->netdev);
1616 }
1617
1618 static int nicvf_config_loopback(struct nicvf *nic,
1619                                  netdev_features_t features)
1620 {
1621         union nic_mbx mbx = {};
1622
1623         mbx.lbk.msg = NIC_MBOX_MSG_LOOPBACK;
1624         mbx.lbk.vf_id = nic->vf_id;
1625         mbx.lbk.enable = (features & NETIF_F_LOOPBACK) != 0;
1626
1627         return nicvf_send_msg_to_pf(nic, &mbx);
1628 }
1629
1630 static netdev_features_t nicvf_fix_features(struct net_device *netdev,
1631                                             netdev_features_t features)
1632 {
1633         struct nicvf *nic = netdev_priv(netdev);
1634
1635         if ((features & NETIF_F_LOOPBACK) &&
1636             netif_running(netdev) && !nic->loopback_supported)
1637                 features &= ~NETIF_F_LOOPBACK;
1638
1639         return features;
1640 }
1641
1642 static int nicvf_set_features(struct net_device *netdev,
1643                               netdev_features_t features)
1644 {
1645         struct nicvf *nic = netdev_priv(netdev);
1646         netdev_features_t changed = features ^ netdev->features;
1647
1648         if (changed & NETIF_F_HW_VLAN_CTAG_RX)
1649                 nicvf_config_vlan_stripping(nic, features);
1650
1651         if ((changed & NETIF_F_LOOPBACK) && netif_running(netdev))
1652                 return nicvf_config_loopback(nic, features);
1653
1654         return 0;
1655 }
1656
1657 static void nicvf_set_xdp_queues(struct nicvf *nic, bool bpf_attached)
1658 {
1659         u8 cq_count, txq_count;
1660
1661         /* Set XDP Tx queue count same as Rx queue count */
1662         if (!bpf_attached)
1663                 nic->xdp_tx_queues = 0;
1664         else
1665                 nic->xdp_tx_queues = nic->rx_queues;
1666
1667         /* If queue count > MAX_CMP_QUEUES_PER_QS, then additional qsets
1668          * needs to be allocated, check how many.
1669          */
1670         txq_count = nic->xdp_tx_queues + nic->tx_queues;
1671         cq_count = max(nic->rx_queues, txq_count);
1672         if (cq_count > MAX_CMP_QUEUES_PER_QS) {
1673                 nic->sqs_count = roundup(cq_count, MAX_CMP_QUEUES_PER_QS);
1674                 nic->sqs_count = (nic->sqs_count / MAX_CMP_QUEUES_PER_QS) - 1;
1675         } else {
1676                 nic->sqs_count = 0;
1677         }
1678
1679         /* Set primary Qset's resources */
1680         nic->qs->rq_cnt = min_t(u8, nic->rx_queues, MAX_RCV_QUEUES_PER_QS);
1681         nic->qs->sq_cnt = min_t(u8, txq_count, MAX_SND_QUEUES_PER_QS);
1682         nic->qs->cq_cnt = max_t(u8, nic->qs->rq_cnt, nic->qs->sq_cnt);
1683
1684         /* Update stack */
1685         nicvf_set_real_num_queues(nic->netdev, nic->tx_queues, nic->rx_queues);
1686 }
1687
1688 static int nicvf_xdp_setup(struct nicvf *nic, struct bpf_prog *prog)
1689 {
1690         struct net_device *dev = nic->netdev;
1691         bool if_up = netif_running(nic->netdev);
1692         struct bpf_prog *old_prog;
1693         bool bpf_attached = false;
1694
1695         /* For now just support only the usual MTU sized frames */
1696         if (prog && (dev->mtu > 1500)) {
1697                 netdev_warn(dev, "Jumbo frames not yet supported with XDP, current MTU %d.\n",
1698                             dev->mtu);
1699                 return -EOPNOTSUPP;
1700         }
1701
1702         /* ALL SQs attached to CQs i.e same as RQs, are treated as
1703          * XDP Tx queues and more Tx queues are allocated for
1704          * network stack to send pkts out.
1705          *
1706          * No of Tx queues are either same as Rx queues or whatever
1707          * is left in max no of queues possible.
1708          */
1709         if ((nic->rx_queues + nic->tx_queues) > nic->max_queues) {
1710                 netdev_warn(dev,
1711                             "Failed to attach BPF prog, RXQs + TXQs > Max %d\n",
1712                             nic->max_queues);
1713                 return -ENOMEM;
1714         }
1715
1716         if (if_up)
1717                 nicvf_stop(nic->netdev);
1718
1719         old_prog = xchg(&nic->xdp_prog, prog);
1720         /* Detach old prog, if any */
1721         if (old_prog)
1722                 bpf_prog_put(old_prog);
1723
1724         if (nic->xdp_prog) {
1725                 /* Attach BPF program */
1726                 nic->xdp_prog = bpf_prog_add(nic->xdp_prog, nic->rx_queues - 1);
1727                 if (!IS_ERR(nic->xdp_prog))
1728                         bpf_attached = true;
1729         }
1730
1731         /* Calculate Tx queues needed for XDP and network stack */
1732         nicvf_set_xdp_queues(nic, bpf_attached);
1733
1734         if (if_up) {
1735                 /* Reinitialize interface, clean slate */
1736                 nicvf_open(nic->netdev);
1737                 netif_trans_update(nic->netdev);
1738         }
1739
1740         return 0;
1741 }
1742
1743 static int nicvf_xdp(struct net_device *netdev, struct netdev_xdp *xdp)
1744 {
1745         struct nicvf *nic = netdev_priv(netdev);
1746
1747         /* To avoid checks while retrieving buffer address from CQE_RX,
1748          * do not support XDP for T88 pass1.x silicons which are anyway
1749          * not in use widely.
1750          */
1751         if (pass1_silicon(nic->pdev))
1752                 return -EOPNOTSUPP;
1753
1754         switch (xdp->command) {
1755         case XDP_SETUP_PROG:
1756                 return nicvf_xdp_setup(nic, xdp->prog);
1757         case XDP_QUERY_PROG:
1758                 xdp->prog_attached = !!nic->xdp_prog;
1759                 xdp->prog_id = nic->xdp_prog ? nic->xdp_prog->aux->id : 0;
1760                 return 0;
1761         default:
1762                 return -EINVAL;
1763         }
1764 }
1765
1766 static const struct net_device_ops nicvf_netdev_ops = {
1767         .ndo_open               = nicvf_open,
1768         .ndo_stop               = nicvf_stop,
1769         .ndo_start_xmit         = nicvf_xmit,
1770         .ndo_change_mtu         = nicvf_change_mtu,
1771         .ndo_set_mac_address    = nicvf_set_mac_address,
1772         .ndo_get_stats64        = nicvf_get_stats64,
1773         .ndo_tx_timeout         = nicvf_tx_timeout,
1774         .ndo_fix_features       = nicvf_fix_features,
1775         .ndo_set_features       = nicvf_set_features,
1776         .ndo_xdp                = nicvf_xdp,
1777 };
1778
1779 static int nicvf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
1780 {
1781         struct device *dev = &pdev->dev;
1782         struct net_device *netdev;
1783         struct nicvf *nic;
1784         int    err, qcount;
1785         u16    sdevid;
1786
1787         err = pci_enable_device(pdev);
1788         if (err) {
1789                 dev_err(dev, "Failed to enable PCI device\n");
1790                 return err;
1791         }
1792
1793         err = pci_request_regions(pdev, DRV_NAME);
1794         if (err) {
1795                 dev_err(dev, "PCI request regions failed 0x%x\n", err);
1796                 goto err_disable_device;
1797         }
1798
1799         err = pci_set_dma_mask(pdev, DMA_BIT_MASK(48));
1800         if (err) {
1801                 dev_err(dev, "Unable to get usable DMA configuration\n");
1802                 goto err_release_regions;
1803         }
1804
1805         err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(48));
1806         if (err) {
1807                 dev_err(dev, "unable to get 48-bit DMA for consistent allocations\n");
1808                 goto err_release_regions;
1809         }
1810
1811         qcount = netif_get_num_default_rss_queues();
1812
1813         /* Restrict multiqset support only for host bound VFs */
1814         if (pdev->is_virtfn) {
1815                 /* Set max number of queues per VF */
1816                 qcount = min_t(int, num_online_cpus(),
1817                                (MAX_SQS_PER_VF + 1) * MAX_CMP_QUEUES_PER_QS);
1818         }
1819
1820         netdev = alloc_etherdev_mqs(sizeof(struct nicvf), qcount, qcount);
1821         if (!netdev) {
1822                 err = -ENOMEM;
1823                 goto err_release_regions;
1824         }
1825
1826         pci_set_drvdata(pdev, netdev);
1827
1828         SET_NETDEV_DEV(netdev, &pdev->dev);
1829
1830         nic = netdev_priv(netdev);
1831         nic->netdev = netdev;
1832         nic->pdev = pdev;
1833         nic->pnicvf = nic;
1834         nic->max_queues = qcount;
1835
1836         /* MAP VF's configuration registers */
1837         nic->reg_base = pcim_iomap(pdev, PCI_CFG_REG_BAR_NUM, 0);
1838         if (!nic->reg_base) {
1839                 dev_err(dev, "Cannot map config register space, aborting\n");
1840                 err = -ENOMEM;
1841                 goto err_free_netdev;
1842         }
1843
1844         nic->drv_stats = netdev_alloc_pcpu_stats(struct nicvf_drv_stats);
1845         if (!nic->drv_stats) {
1846                 err = -ENOMEM;
1847                 goto err_free_netdev;
1848         }
1849
1850         err = nicvf_set_qset_resources(nic);
1851         if (err)
1852                 goto err_free_netdev;
1853
1854         /* Check if PF is alive and get MAC address for this VF */
1855         err = nicvf_register_misc_interrupt(nic);
1856         if (err)
1857                 goto err_free_netdev;
1858
1859         nicvf_send_vf_struct(nic);
1860
1861         if (!pass1_silicon(nic->pdev))
1862                 nic->hw_tso = true;
1863
1864         /* Get iommu domain for iova to physical addr conversion */
1865         nic->iommu_domain = iommu_get_domain_for_dev(dev);
1866
1867         pci_read_config_word(nic->pdev, PCI_SUBSYSTEM_ID, &sdevid);
1868         if (sdevid == 0xA134)
1869                 nic->t88 = true;
1870
1871         /* Check if this VF is in QS only mode */
1872         if (nic->sqs_mode)
1873                 return 0;
1874
1875         err = nicvf_set_real_num_queues(netdev, nic->tx_queues, nic->rx_queues);
1876         if (err)
1877                 goto err_unregister_interrupts;
1878
1879         netdev->hw_features = (NETIF_F_RXCSUM | NETIF_F_SG |
1880                                NETIF_F_TSO | NETIF_F_GRO | NETIF_F_TSO6 |
1881                                NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
1882                                NETIF_F_HW_VLAN_CTAG_RX);
1883
1884         netdev->hw_features |= NETIF_F_RXHASH;
1885
1886         netdev->features |= netdev->hw_features;
1887         netdev->hw_features |= NETIF_F_LOOPBACK;
1888
1889         netdev->vlan_features = NETIF_F_SG | NETIF_F_IP_CSUM |
1890                                 NETIF_F_IPV6_CSUM | NETIF_F_TSO | NETIF_F_TSO6;
1891
1892         netdev->netdev_ops = &nicvf_netdev_ops;
1893         netdev->watchdog_timeo = NICVF_TX_TIMEOUT;
1894
1895         /* MTU range: 64 - 9200 */
1896         netdev->min_mtu = NIC_HW_MIN_FRS;
1897         netdev->max_mtu = NIC_HW_MAX_FRS;
1898
1899         INIT_WORK(&nic->reset_task, nicvf_reset_task);
1900
1901         err = register_netdev(netdev);
1902         if (err) {
1903                 dev_err(dev, "Failed to register netdevice\n");
1904                 goto err_unregister_interrupts;
1905         }
1906
1907         nic->msg_enable = debug;
1908
1909         nicvf_set_ethtool_ops(netdev);
1910
1911         return 0;
1912
1913 err_unregister_interrupts:
1914         nicvf_unregister_interrupts(nic);
1915 err_free_netdev:
1916         pci_set_drvdata(pdev, NULL);
1917         if (nic->drv_stats)
1918                 free_percpu(nic->drv_stats);
1919         free_netdev(netdev);
1920 err_release_regions:
1921         pci_release_regions(pdev);
1922 err_disable_device:
1923         pci_disable_device(pdev);
1924         return err;
1925 }
1926
1927 static void nicvf_remove(struct pci_dev *pdev)
1928 {
1929         struct net_device *netdev = pci_get_drvdata(pdev);
1930         struct nicvf *nic;
1931         struct net_device *pnetdev;
1932
1933         if (!netdev)
1934                 return;
1935
1936         nic = netdev_priv(netdev);
1937         pnetdev = nic->pnicvf->netdev;
1938
1939         /* Check if this Qset is assigned to different VF.
1940          * If yes, clean primary and all secondary Qsets.
1941          */
1942         if (pnetdev && (pnetdev->reg_state == NETREG_REGISTERED))
1943                 unregister_netdev(pnetdev);
1944         nicvf_unregister_interrupts(nic);
1945         pci_set_drvdata(pdev, NULL);
1946         if (nic->drv_stats)
1947                 free_percpu(nic->drv_stats);
1948         free_netdev(netdev);
1949         pci_release_regions(pdev);
1950         pci_disable_device(pdev);
1951 }
1952
1953 static void nicvf_shutdown(struct pci_dev *pdev)
1954 {
1955         nicvf_remove(pdev);
1956 }
1957
1958 static struct pci_driver nicvf_driver = {
1959         .name = DRV_NAME,
1960         .id_table = nicvf_id_table,
1961         .probe = nicvf_probe,
1962         .remove = nicvf_remove,
1963         .shutdown = nicvf_shutdown,
1964 };
1965
1966 static int __init nicvf_init_module(void)
1967 {
1968         pr_info("%s, ver %s\n", DRV_NAME, DRV_VERSION);
1969
1970         return pci_register_driver(&nicvf_driver);
1971 }
1972
1973 static void __exit nicvf_cleanup_module(void)
1974 {
1975         pci_unregister_driver(&nicvf_driver);
1976 }
1977
1978 module_init(nicvf_init_module);
1979 module_exit(nicvf_cleanup_module);