1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright(c) 2018 Intel Corporation. */
4 #include <linux/bpf_trace.h>
5 #include <net/xdp_sock.h>
9 #include "ixgbe_txrx_common.h"
11 struct xdp_umem *ixgbe_xsk_umem(struct ixgbe_adapter *adapter,
12 struct ixgbe_ring *ring)
14 bool xdp_on = READ_ONCE(adapter->xdp_prog);
15 int qid = ring->ring_idx;
17 if (!adapter->xsk_umems || !adapter->xsk_umems[qid] ||
18 qid >= adapter->num_xsk_umems || !xdp_on)
21 return adapter->xsk_umems[qid];
24 static int ixgbe_alloc_xsk_umems(struct ixgbe_adapter *adapter)
26 if (adapter->xsk_umems)
29 adapter->num_xsk_umems_used = 0;
30 adapter->num_xsk_umems = adapter->num_rx_queues;
31 adapter->xsk_umems = kcalloc(adapter->num_xsk_umems,
32 sizeof(*adapter->xsk_umems),
34 if (!adapter->xsk_umems) {
35 adapter->num_xsk_umems = 0;
42 static int ixgbe_add_xsk_umem(struct ixgbe_adapter *adapter,
43 struct xdp_umem *umem,
48 err = ixgbe_alloc_xsk_umems(adapter);
52 adapter->xsk_umems[qid] = umem;
53 adapter->num_xsk_umems_used++;
58 static void ixgbe_remove_xsk_umem(struct ixgbe_adapter *adapter, u16 qid)
60 adapter->xsk_umems[qid] = NULL;
61 adapter->num_xsk_umems_used--;
63 if (adapter->num_xsk_umems == 0) {
64 kfree(adapter->xsk_umems);
65 adapter->xsk_umems = NULL;
66 adapter->num_xsk_umems = 0;
70 static int ixgbe_xsk_umem_dma_map(struct ixgbe_adapter *adapter,
71 struct xdp_umem *umem)
73 struct device *dev = &adapter->pdev->dev;
77 for (i = 0; i < umem->npgs; i++) {
78 dma = dma_map_page_attrs(dev, umem->pgs[i], 0, PAGE_SIZE,
79 DMA_BIDIRECTIONAL, IXGBE_RX_DMA_ATTR);
80 if (dma_mapping_error(dev, dma))
83 umem->pages[i].dma = dma;
89 for (j = 0; j < i; j++) {
90 dma_unmap_page_attrs(dev, umem->pages[i].dma, PAGE_SIZE,
91 DMA_BIDIRECTIONAL, IXGBE_RX_DMA_ATTR);
92 umem->pages[i].dma = 0;
98 static void ixgbe_xsk_umem_dma_unmap(struct ixgbe_adapter *adapter,
99 struct xdp_umem *umem)
101 struct device *dev = &adapter->pdev->dev;
104 for (i = 0; i < umem->npgs; i++) {
105 dma_unmap_page_attrs(dev, umem->pages[i].dma, PAGE_SIZE,
106 DMA_BIDIRECTIONAL, IXGBE_RX_DMA_ATTR);
108 umem->pages[i].dma = 0;
112 static int ixgbe_xsk_umem_enable(struct ixgbe_adapter *adapter,
113 struct xdp_umem *umem,
116 struct xdp_umem_fq_reuse *reuseq;
120 if (qid >= adapter->num_rx_queues)
123 if (adapter->xsk_umems) {
124 if (qid >= adapter->num_xsk_umems)
126 if (adapter->xsk_umems[qid])
130 reuseq = xsk_reuseq_prepare(adapter->rx_ring[0]->count);
134 xsk_reuseq_free(xsk_reuseq_swap(umem, reuseq));
136 err = ixgbe_xsk_umem_dma_map(adapter, umem);
140 if_running = netif_running(adapter->netdev) &&
141 READ_ONCE(adapter->xdp_prog);
144 ixgbe_txrx_ring_disable(adapter, qid);
146 err = ixgbe_add_xsk_umem(adapter, umem, qid);
149 ixgbe_txrx_ring_enable(adapter, qid);
154 static int ixgbe_xsk_umem_disable(struct ixgbe_adapter *adapter, u16 qid)
158 if (!adapter->xsk_umems || qid >= adapter->num_xsk_umems ||
159 !adapter->xsk_umems[qid])
162 if_running = netif_running(adapter->netdev) &&
163 READ_ONCE(adapter->xdp_prog);
166 ixgbe_txrx_ring_disable(adapter, qid);
168 ixgbe_xsk_umem_dma_unmap(adapter, adapter->xsk_umems[qid]);
169 ixgbe_remove_xsk_umem(adapter, qid);
172 ixgbe_txrx_ring_enable(adapter, qid);
177 int ixgbe_xsk_umem_query(struct ixgbe_adapter *adapter, struct xdp_umem **umem,
180 if (qid >= adapter->num_rx_queues)
183 if (adapter->xsk_umems) {
184 if (qid >= adapter->num_xsk_umems)
186 *umem = adapter->xsk_umems[qid];
194 int ixgbe_xsk_umem_setup(struct ixgbe_adapter *adapter, struct xdp_umem *umem,
197 return umem ? ixgbe_xsk_umem_enable(adapter, umem, qid) :
198 ixgbe_xsk_umem_disable(adapter, qid);
201 static int ixgbe_run_xdp_zc(struct ixgbe_adapter *adapter,
202 struct ixgbe_ring *rx_ring,
203 struct xdp_buff *xdp)
205 int err, result = IXGBE_XDP_PASS;
206 struct bpf_prog *xdp_prog;
207 struct xdp_frame *xdpf;
211 xdp_prog = READ_ONCE(rx_ring->xdp_prog);
212 act = bpf_prog_run_xdp(xdp_prog, xdp);
213 xdp->handle += xdp->data - xdp->data_hard_start;
218 xdpf = convert_to_xdp_frame(xdp);
219 if (unlikely(!xdpf)) {
220 result = IXGBE_XDP_CONSUMED;
223 result = ixgbe_xmit_xdp_ring(adapter, xdpf);
226 err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog);
227 result = !err ? IXGBE_XDP_REDIR : IXGBE_XDP_CONSUMED;
230 bpf_warn_invalid_xdp_action(act);
233 trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
234 /* fallthrough -- handle aborts by dropping packet */
236 result = IXGBE_XDP_CONSUMED;
244 ixgbe_rx_buffer *ixgbe_get_rx_buffer_zc(struct ixgbe_ring *rx_ring,
247 struct ixgbe_rx_buffer *bi;
249 bi = &rx_ring->rx_buffer_info[rx_ring->next_to_clean];
251 /* we are reusing so sync this buffer for CPU use */
252 dma_sync_single_range_for_cpu(rx_ring->dev,
260 static void ixgbe_reuse_rx_buffer_zc(struct ixgbe_ring *rx_ring,
261 struct ixgbe_rx_buffer *obi)
263 unsigned long mask = (unsigned long)rx_ring->xsk_umem->chunk_mask;
264 u64 hr = rx_ring->xsk_umem->headroom + XDP_PACKET_HEADROOM;
265 u16 nta = rx_ring->next_to_alloc;
266 struct ixgbe_rx_buffer *nbi;
268 nbi = &rx_ring->rx_buffer_info[rx_ring->next_to_alloc];
269 /* update, and store next to alloc */
271 rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0;
273 /* transfer page from old buffer to new buffer */
274 nbi->dma = obi->dma & mask;
277 nbi->addr = (void *)((unsigned long)obi->addr & mask);
280 nbi->handle = obi->handle & mask;
281 nbi->handle += rx_ring->xsk_umem->headroom;
287 void ixgbe_zca_free(struct zero_copy_allocator *alloc, unsigned long handle)
289 struct ixgbe_rx_buffer *bi;
290 struct ixgbe_ring *rx_ring;
294 rx_ring = container_of(alloc, struct ixgbe_ring, zca);
295 hr = rx_ring->xsk_umem->headroom + XDP_PACKET_HEADROOM;
296 mask = rx_ring->xsk_umem->chunk_mask;
298 nta = rx_ring->next_to_alloc;
299 bi = rx_ring->rx_buffer_info;
302 rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0;
306 bi->dma = xdp_umem_get_dma(rx_ring->xsk_umem, handle);
309 bi->addr = xdp_umem_get_data(rx_ring->xsk_umem, handle);
312 bi->handle = (u64)handle + rx_ring->xsk_umem->headroom;
315 static bool ixgbe_alloc_buffer_zc(struct ixgbe_ring *rx_ring,
316 struct ixgbe_rx_buffer *bi)
318 struct xdp_umem *umem = rx_ring->xsk_umem;
319 void *addr = bi->addr;
325 if (!xsk_umem_peek_addr(umem, &handle)) {
326 rx_ring->rx_stats.alloc_rx_page_failed++;
330 hr = umem->headroom + XDP_PACKET_HEADROOM;
332 bi->dma = xdp_umem_get_dma(umem, handle);
335 bi->addr = xdp_umem_get_data(umem, handle);
338 bi->handle = handle + umem->headroom;
340 xsk_umem_discard_addr(umem);
344 static bool ixgbe_alloc_buffer_slow_zc(struct ixgbe_ring *rx_ring,
345 struct ixgbe_rx_buffer *bi)
347 struct xdp_umem *umem = rx_ring->xsk_umem;
350 if (!xsk_umem_peek_addr_rq(umem, &handle)) {
351 rx_ring->rx_stats.alloc_rx_page_failed++;
355 handle &= rx_ring->xsk_umem->chunk_mask;
357 hr = umem->headroom + XDP_PACKET_HEADROOM;
359 bi->dma = xdp_umem_get_dma(umem, handle);
362 bi->addr = xdp_umem_get_data(umem, handle);
365 bi->handle = handle + umem->headroom;
367 xsk_umem_discard_addr_rq(umem);
371 static __always_inline bool
372 __ixgbe_alloc_rx_buffers_zc(struct ixgbe_ring *rx_ring, u16 cleaned_count,
373 bool alloc(struct ixgbe_ring *rx_ring,
374 struct ixgbe_rx_buffer *bi))
376 union ixgbe_adv_rx_desc *rx_desc;
377 struct ixgbe_rx_buffer *bi;
378 u16 i = rx_ring->next_to_use;
385 rx_desc = IXGBE_RX_DESC(rx_ring, i);
386 bi = &rx_ring->rx_buffer_info[i];
390 if (!alloc(rx_ring, bi)) {
395 /* sync the buffer for use by the device */
396 dma_sync_single_range_for_device(rx_ring->dev, bi->dma,
401 /* Refresh the desc even if buffer_addrs didn't change
402 * because each write-back erases this info.
404 rx_desc->read.pkt_addr = cpu_to_le64(bi->dma);
410 rx_desc = IXGBE_RX_DESC(rx_ring, 0);
411 bi = rx_ring->rx_buffer_info;
415 /* clear the length for the next_to_use descriptor */
416 rx_desc->wb.upper.length = 0;
419 } while (cleaned_count);
423 if (rx_ring->next_to_use != i) {
424 rx_ring->next_to_use = i;
426 /* update next to alloc since we have filled the ring */
427 rx_ring->next_to_alloc = i;
429 /* Force memory writes to complete before letting h/w
430 * know there are new descriptors to fetch. (Only
431 * applicable for weak-ordered memory model archs,
435 writel(i, rx_ring->tail);
441 void ixgbe_alloc_rx_buffers_zc(struct ixgbe_ring *rx_ring, u16 count)
443 __ixgbe_alloc_rx_buffers_zc(rx_ring, count,
444 ixgbe_alloc_buffer_slow_zc);
447 static bool ixgbe_alloc_rx_buffers_fast_zc(struct ixgbe_ring *rx_ring,
450 return __ixgbe_alloc_rx_buffers_zc(rx_ring, count,
451 ixgbe_alloc_buffer_zc);
454 static struct sk_buff *ixgbe_construct_skb_zc(struct ixgbe_ring *rx_ring,
455 struct ixgbe_rx_buffer *bi,
456 struct xdp_buff *xdp)
458 unsigned int metasize = xdp->data - xdp->data_meta;
459 unsigned int datasize = xdp->data_end - xdp->data;
462 /* allocate a skb to store the frags */
463 skb = __napi_alloc_skb(&rx_ring->q_vector->napi,
464 xdp->data_end - xdp->data_hard_start,
465 GFP_ATOMIC | __GFP_NOWARN);
469 skb_reserve(skb, xdp->data - xdp->data_hard_start);
470 memcpy(__skb_put(skb, datasize), xdp->data, datasize);
472 skb_metadata_set(skb, metasize);
474 ixgbe_reuse_rx_buffer_zc(rx_ring, bi);
478 static void ixgbe_inc_ntc(struct ixgbe_ring *rx_ring)
480 u32 ntc = rx_ring->next_to_clean + 1;
482 ntc = (ntc < rx_ring->count) ? ntc : 0;
483 rx_ring->next_to_clean = ntc;
484 prefetch(IXGBE_RX_DESC(rx_ring, ntc));
487 int ixgbe_clean_rx_irq_zc(struct ixgbe_q_vector *q_vector,
488 struct ixgbe_ring *rx_ring,
491 unsigned int total_rx_bytes = 0, total_rx_packets = 0;
492 struct ixgbe_adapter *adapter = q_vector->adapter;
493 u16 cleaned_count = ixgbe_desc_unused(rx_ring);
494 unsigned int xdp_res, xdp_xmit = 0;
495 bool failure = false;
499 xdp.rxq = &rx_ring->xdp_rxq;
501 while (likely(total_rx_packets < budget)) {
502 union ixgbe_adv_rx_desc *rx_desc;
503 struct ixgbe_rx_buffer *bi;
506 /* return some buffers to hardware, one at a time is too slow */
507 if (cleaned_count >= IXGBE_RX_BUFFER_WRITE) {
509 !ixgbe_alloc_rx_buffers_fast_zc(rx_ring,
514 rx_desc = IXGBE_RX_DESC(rx_ring, rx_ring->next_to_clean);
515 size = le16_to_cpu(rx_desc->wb.upper.length);
519 /* This memory barrier is needed to keep us from reading
520 * any other fields out of the rx_desc until we know the
521 * descriptor has been written back
525 bi = ixgbe_get_rx_buffer_zc(rx_ring, size);
527 if (unlikely(!ixgbe_test_staterr(rx_desc,
528 IXGBE_RXD_STAT_EOP))) {
529 struct ixgbe_rx_buffer *next_bi;
531 ixgbe_reuse_rx_buffer_zc(rx_ring, bi);
532 ixgbe_inc_ntc(rx_ring);
534 &rx_ring->rx_buffer_info[rx_ring->next_to_clean];
535 next_bi->skb = ERR_PTR(-EINVAL);
539 if (unlikely(bi->skb)) {
540 ixgbe_reuse_rx_buffer_zc(rx_ring, bi);
541 ixgbe_inc_ntc(rx_ring);
546 xdp.data_meta = xdp.data;
547 xdp.data_hard_start = xdp.data - XDP_PACKET_HEADROOM;
548 xdp.data_end = xdp.data + size;
549 xdp.handle = bi->handle;
551 xdp_res = ixgbe_run_xdp_zc(adapter, rx_ring, &xdp);
554 if (xdp_res & (IXGBE_XDP_TX | IXGBE_XDP_REDIR)) {
559 ixgbe_reuse_rx_buffer_zc(rx_ring, bi);
562 total_rx_bytes += size;
565 ixgbe_inc_ntc(rx_ring);
570 skb = ixgbe_construct_skb_zc(rx_ring, bi, &xdp);
572 rx_ring->rx_stats.alloc_rx_buff_failed++;
577 ixgbe_inc_ntc(rx_ring);
579 if (eth_skb_pad(skb))
582 total_rx_bytes += skb->len;
585 ixgbe_process_skb_fields(rx_ring, rx_desc, skb);
586 ixgbe_rx_skb(q_vector, skb);
589 if (xdp_xmit & IXGBE_XDP_REDIR)
592 if (xdp_xmit & IXGBE_XDP_TX) {
593 struct ixgbe_ring *ring = adapter->xdp_ring[smp_processor_id()];
595 /* Force memory writes to complete before letting h/w
596 * know there are new descriptors to fetch.
599 writel(ring->next_to_use, ring->tail);
602 u64_stats_update_begin(&rx_ring->syncp);
603 rx_ring->stats.packets += total_rx_packets;
604 rx_ring->stats.bytes += total_rx_bytes;
605 u64_stats_update_end(&rx_ring->syncp);
606 q_vector->rx.total_packets += total_rx_packets;
607 q_vector->rx.total_bytes += total_rx_bytes;
609 return failure ? budget : (int)total_rx_packets;
612 void ixgbe_xsk_clean_rx_ring(struct ixgbe_ring *rx_ring)
614 u16 i = rx_ring->next_to_clean;
615 struct ixgbe_rx_buffer *bi = &rx_ring->rx_buffer_info[i];
617 while (i != rx_ring->next_to_alloc) {
618 xsk_umem_fq_reuse(rx_ring->xsk_umem, bi->handle);
621 if (i == rx_ring->count) {
623 bi = rx_ring->rx_buffer_info;
628 static bool ixgbe_xmit_zc(struct ixgbe_ring *xdp_ring, unsigned int budget)
630 union ixgbe_adv_tx_desc *tx_desc = NULL;
631 struct ixgbe_tx_buffer *tx_bi;
632 bool work_done = true;
636 while (budget-- > 0) {
637 if (unlikely(!ixgbe_desc_unused(xdp_ring))) {
642 if (!xsk_umem_consume_tx(xdp_ring->xsk_umem, &dma, &len))
645 dma_sync_single_for_device(xdp_ring->dev, dma, len,
648 tx_bi = &xdp_ring->tx_buffer_info[xdp_ring->next_to_use];
649 tx_bi->bytecount = len;
652 tx_desc = IXGBE_TX_DESC(xdp_ring, xdp_ring->next_to_use);
653 tx_desc->read.buffer_addr = cpu_to_le64(dma);
655 /* put descriptor type bits */
656 cmd_type = IXGBE_ADVTXD_DTYP_DATA |
657 IXGBE_ADVTXD_DCMD_DEXT |
658 IXGBE_ADVTXD_DCMD_IFCS;
659 cmd_type |= len | IXGBE_TXD_CMD;
660 tx_desc->read.cmd_type_len = cpu_to_le32(cmd_type);
661 tx_desc->read.olinfo_status =
662 cpu_to_le32(len << IXGBE_ADVTXD_PAYLEN_SHIFT);
664 xdp_ring->next_to_use++;
665 if (xdp_ring->next_to_use == xdp_ring->count)
666 xdp_ring->next_to_use = 0;
670 ixgbe_xdp_ring_update_tail(xdp_ring);
671 xsk_umem_consume_tx_done(xdp_ring->xsk_umem);
674 return !!budget && work_done;
677 static void ixgbe_clean_xdp_tx_buffer(struct ixgbe_ring *tx_ring,
678 struct ixgbe_tx_buffer *tx_bi)
680 xdp_return_frame(tx_bi->xdpf);
681 dma_unmap_single(tx_ring->dev,
682 dma_unmap_addr(tx_bi, dma),
683 dma_unmap_len(tx_bi, len), DMA_TO_DEVICE);
684 dma_unmap_len_set(tx_bi, len, 0);
687 bool ixgbe_clean_xdp_tx_irq(struct ixgbe_q_vector *q_vector,
688 struct ixgbe_ring *tx_ring, int napi_budget)
690 unsigned int total_packets = 0, total_bytes = 0;
691 u32 i = tx_ring->next_to_clean, xsk_frames = 0;
692 unsigned int budget = q_vector->tx.work_limit;
693 struct xdp_umem *umem = tx_ring->xsk_umem;
694 union ixgbe_adv_tx_desc *tx_desc;
695 struct ixgbe_tx_buffer *tx_bi;
698 tx_bi = &tx_ring->tx_buffer_info[i];
699 tx_desc = IXGBE_TX_DESC(tx_ring, i);
703 if (!(tx_desc->wb.status & cpu_to_le32(IXGBE_TXD_STAT_DD)))
706 total_bytes += tx_bi->bytecount;
707 total_packets += tx_bi->gso_segs;
710 ixgbe_clean_xdp_tx_buffer(tx_ring, tx_bi);
715 total_bytes += tx_bi->bytecount;
722 tx_bi = tx_ring->tx_buffer_info;
723 tx_desc = IXGBE_TX_DESC(tx_ring, 0);
726 /* issue prefetch for next Tx descriptor */
729 /* update budget accounting */
731 } while (likely(budget));
734 tx_ring->next_to_clean = i;
736 u64_stats_update_begin(&tx_ring->syncp);
737 tx_ring->stats.bytes += total_bytes;
738 tx_ring->stats.packets += total_packets;
739 u64_stats_update_end(&tx_ring->syncp);
740 q_vector->tx.total_bytes += total_bytes;
741 q_vector->tx.total_packets += total_packets;
744 xsk_umem_complete_tx(umem, xsk_frames);
746 xmit_done = ixgbe_xmit_zc(tx_ring, q_vector->tx.work_limit);
747 return budget > 0 && xmit_done;
750 int ixgbe_xsk_async_xmit(struct net_device *dev, u32 qid)
752 struct ixgbe_adapter *adapter = netdev_priv(dev);
753 struct ixgbe_ring *ring;
755 if (test_bit(__IXGBE_DOWN, &adapter->state))
758 if (!READ_ONCE(adapter->xdp_prog))
761 if (qid >= adapter->num_xdp_queues)
764 if (!adapter->xsk_umems || !adapter->xsk_umems[qid])
767 ring = adapter->xdp_ring[qid];
768 if (!napi_if_scheduled_mark_missed(&ring->q_vector->napi)) {
769 u64 eics = BIT_ULL(ring->q_vector->v_idx);
771 ixgbe_irq_rearm_queues(adapter, eics);
777 void ixgbe_xsk_clean_tx_ring(struct ixgbe_ring *tx_ring)
779 u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use;
780 struct xdp_umem *umem = tx_ring->xsk_umem;
781 struct ixgbe_tx_buffer *tx_bi;
785 tx_bi = &tx_ring->tx_buffer_info[ntc];
788 ixgbe_clean_xdp_tx_buffer(tx_ring, tx_bi);
795 if (ntc == tx_ring->count)
800 xsk_umem_complete_tx(umem, xsk_frames);