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 (!xdp_on || !test_bit(qid, adapter->af_xdp_zc_qps))
20 return xdp_get_umem_from_qid(adapter->netdev, qid);
23 static int ixgbe_xsk_umem_dma_map(struct ixgbe_adapter *adapter,
24 struct xdp_umem *umem)
26 struct device *dev = &adapter->pdev->dev;
30 for (i = 0; i < umem->npgs; i++) {
31 dma = dma_map_page_attrs(dev, umem->pgs[i], 0, PAGE_SIZE,
32 DMA_BIDIRECTIONAL, IXGBE_RX_DMA_ATTR);
33 if (dma_mapping_error(dev, dma))
36 umem->pages[i].dma = dma;
42 for (j = 0; j < i; j++) {
43 dma_unmap_page_attrs(dev, umem->pages[i].dma, PAGE_SIZE,
44 DMA_BIDIRECTIONAL, IXGBE_RX_DMA_ATTR);
45 umem->pages[i].dma = 0;
51 static void ixgbe_xsk_umem_dma_unmap(struct ixgbe_adapter *adapter,
52 struct xdp_umem *umem)
54 struct device *dev = &adapter->pdev->dev;
57 for (i = 0; i < umem->npgs; i++) {
58 dma_unmap_page_attrs(dev, umem->pages[i].dma, PAGE_SIZE,
59 DMA_BIDIRECTIONAL, IXGBE_RX_DMA_ATTR);
61 umem->pages[i].dma = 0;
65 static int ixgbe_xsk_umem_enable(struct ixgbe_adapter *adapter,
66 struct xdp_umem *umem,
69 struct net_device *netdev = adapter->netdev;
70 struct xdp_umem_fq_reuse *reuseq;
74 if (qid >= adapter->num_rx_queues)
77 if (qid >= netdev->real_num_rx_queues ||
78 qid >= netdev->real_num_tx_queues)
81 reuseq = xsk_reuseq_prepare(adapter->rx_ring[0]->count);
85 xsk_reuseq_free(xsk_reuseq_swap(umem, reuseq));
87 err = ixgbe_xsk_umem_dma_map(adapter, umem);
91 if_running = netif_running(adapter->netdev) &&
92 ixgbe_enabled_xdp_adapter(adapter);
95 ixgbe_txrx_ring_disable(adapter, qid);
97 set_bit(qid, adapter->af_xdp_zc_qps);
100 ixgbe_txrx_ring_enable(adapter, qid);
102 /* Kick start the NAPI context so that receiving will start */
103 err = ixgbe_xsk_wakeup(adapter->netdev, qid, XDP_WAKEUP_RX);
111 static int ixgbe_xsk_umem_disable(struct ixgbe_adapter *adapter, u16 qid)
113 struct xdp_umem *umem;
116 umem = xdp_get_umem_from_qid(adapter->netdev, qid);
120 if_running = netif_running(adapter->netdev) &&
121 ixgbe_enabled_xdp_adapter(adapter);
124 ixgbe_txrx_ring_disable(adapter, qid);
126 clear_bit(qid, adapter->af_xdp_zc_qps);
127 ixgbe_xsk_umem_dma_unmap(adapter, umem);
130 ixgbe_txrx_ring_enable(adapter, qid);
135 int ixgbe_xsk_umem_setup(struct ixgbe_adapter *adapter, struct xdp_umem *umem,
138 return umem ? ixgbe_xsk_umem_enable(adapter, umem, qid) :
139 ixgbe_xsk_umem_disable(adapter, qid);
142 static int ixgbe_run_xdp_zc(struct ixgbe_adapter *adapter,
143 struct ixgbe_ring *rx_ring,
144 struct xdp_buff *xdp)
146 struct xdp_umem *umem = rx_ring->xsk_umem;
147 int err, result = IXGBE_XDP_PASS;
148 u64 offset = umem->headroom;
149 struct bpf_prog *xdp_prog;
150 struct xdp_frame *xdpf;
154 xdp_prog = READ_ONCE(rx_ring->xdp_prog);
155 act = bpf_prog_run_xdp(xdp_prog, xdp);
156 offset += xdp->data - xdp->data_hard_start;
158 xdp->handle = xsk_umem_adjust_offset(umem, xdp->handle, offset);
164 xdpf = convert_to_xdp_frame(xdp);
165 if (unlikely(!xdpf)) {
166 result = IXGBE_XDP_CONSUMED;
169 result = ixgbe_xmit_xdp_ring(adapter, xdpf);
172 err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog);
173 result = !err ? IXGBE_XDP_REDIR : IXGBE_XDP_CONSUMED;
176 bpf_warn_invalid_xdp_action(act);
179 trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
180 /* fallthrough -- handle aborts by dropping packet */
182 result = IXGBE_XDP_CONSUMED;
190 ixgbe_rx_buffer *ixgbe_get_rx_buffer_zc(struct ixgbe_ring *rx_ring,
193 struct ixgbe_rx_buffer *bi;
195 bi = &rx_ring->rx_buffer_info[rx_ring->next_to_clean];
197 /* we are reusing so sync this buffer for CPU use */
198 dma_sync_single_range_for_cpu(rx_ring->dev,
206 static void ixgbe_reuse_rx_buffer_zc(struct ixgbe_ring *rx_ring,
207 struct ixgbe_rx_buffer *obi)
209 u16 nta = rx_ring->next_to_alloc;
210 struct ixgbe_rx_buffer *nbi;
212 nbi = &rx_ring->rx_buffer_info[rx_ring->next_to_alloc];
213 /* update, and store next to alloc */
215 rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0;
217 /* transfer page from old buffer to new buffer */
219 nbi->addr = obi->addr;
220 nbi->handle = obi->handle;
226 void ixgbe_zca_free(struct zero_copy_allocator *alloc, unsigned long handle)
228 struct ixgbe_rx_buffer *bi;
229 struct ixgbe_ring *rx_ring;
233 rx_ring = container_of(alloc, struct ixgbe_ring, zca);
234 hr = rx_ring->xsk_umem->headroom + XDP_PACKET_HEADROOM;
235 mask = rx_ring->xsk_umem->chunk_mask;
237 nta = rx_ring->next_to_alloc;
238 bi = rx_ring->rx_buffer_info;
241 rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0;
245 bi->dma = xdp_umem_get_dma(rx_ring->xsk_umem, handle);
248 bi->addr = xdp_umem_get_data(rx_ring->xsk_umem, handle);
251 bi->handle = xsk_umem_adjust_offset(rx_ring->xsk_umem, (u64)handle,
252 rx_ring->xsk_umem->headroom);
255 static bool ixgbe_alloc_buffer_zc(struct ixgbe_ring *rx_ring,
256 struct ixgbe_rx_buffer *bi)
258 struct xdp_umem *umem = rx_ring->xsk_umem;
259 void *addr = bi->addr;
265 if (!xsk_umem_peek_addr(umem, &handle)) {
266 rx_ring->rx_stats.alloc_rx_page_failed++;
270 hr = umem->headroom + XDP_PACKET_HEADROOM;
272 bi->dma = xdp_umem_get_dma(umem, handle);
275 bi->addr = xdp_umem_get_data(umem, handle);
278 bi->handle = xsk_umem_adjust_offset(umem, handle, umem->headroom);
280 xsk_umem_discard_addr(umem);
284 static bool ixgbe_alloc_buffer_slow_zc(struct ixgbe_ring *rx_ring,
285 struct ixgbe_rx_buffer *bi)
287 struct xdp_umem *umem = rx_ring->xsk_umem;
290 if (!xsk_umem_peek_addr_rq(umem, &handle)) {
291 rx_ring->rx_stats.alloc_rx_page_failed++;
295 handle &= rx_ring->xsk_umem->chunk_mask;
297 hr = umem->headroom + XDP_PACKET_HEADROOM;
299 bi->dma = xdp_umem_get_dma(umem, handle);
302 bi->addr = xdp_umem_get_data(umem, handle);
305 bi->handle = xsk_umem_adjust_offset(umem, handle, umem->headroom);
307 xsk_umem_discard_addr_rq(umem);
311 static __always_inline bool
312 __ixgbe_alloc_rx_buffers_zc(struct ixgbe_ring *rx_ring, u16 cleaned_count,
313 bool alloc(struct ixgbe_ring *rx_ring,
314 struct ixgbe_rx_buffer *bi))
316 union ixgbe_adv_rx_desc *rx_desc;
317 struct ixgbe_rx_buffer *bi;
318 u16 i = rx_ring->next_to_use;
325 rx_desc = IXGBE_RX_DESC(rx_ring, i);
326 bi = &rx_ring->rx_buffer_info[i];
330 if (!alloc(rx_ring, bi)) {
335 /* sync the buffer for use by the device */
336 dma_sync_single_range_for_device(rx_ring->dev, bi->dma,
341 /* Refresh the desc even if buffer_addrs didn't change
342 * because each write-back erases this info.
344 rx_desc->read.pkt_addr = cpu_to_le64(bi->dma);
350 rx_desc = IXGBE_RX_DESC(rx_ring, 0);
351 bi = rx_ring->rx_buffer_info;
355 /* clear the length for the next_to_use descriptor */
356 rx_desc->wb.upper.length = 0;
359 } while (cleaned_count);
363 if (rx_ring->next_to_use != i) {
364 rx_ring->next_to_use = i;
366 /* update next to alloc since we have filled the ring */
367 rx_ring->next_to_alloc = i;
369 /* Force memory writes to complete before letting h/w
370 * know there are new descriptors to fetch. (Only
371 * applicable for weak-ordered memory model archs,
375 writel(i, rx_ring->tail);
381 void ixgbe_alloc_rx_buffers_zc(struct ixgbe_ring *rx_ring, u16 count)
383 __ixgbe_alloc_rx_buffers_zc(rx_ring, count,
384 ixgbe_alloc_buffer_slow_zc);
387 static bool ixgbe_alloc_rx_buffers_fast_zc(struct ixgbe_ring *rx_ring,
390 return __ixgbe_alloc_rx_buffers_zc(rx_ring, count,
391 ixgbe_alloc_buffer_zc);
394 static struct sk_buff *ixgbe_construct_skb_zc(struct ixgbe_ring *rx_ring,
395 struct ixgbe_rx_buffer *bi,
396 struct xdp_buff *xdp)
398 unsigned int metasize = xdp->data - xdp->data_meta;
399 unsigned int datasize = xdp->data_end - xdp->data;
402 /* allocate a skb to store the frags */
403 skb = __napi_alloc_skb(&rx_ring->q_vector->napi,
404 xdp->data_end - xdp->data_hard_start,
405 GFP_ATOMIC | __GFP_NOWARN);
409 skb_reserve(skb, xdp->data - xdp->data_hard_start);
410 memcpy(__skb_put(skb, datasize), xdp->data, datasize);
412 skb_metadata_set(skb, metasize);
414 ixgbe_reuse_rx_buffer_zc(rx_ring, bi);
418 static void ixgbe_inc_ntc(struct ixgbe_ring *rx_ring)
420 u32 ntc = rx_ring->next_to_clean + 1;
422 ntc = (ntc < rx_ring->count) ? ntc : 0;
423 rx_ring->next_to_clean = ntc;
424 prefetch(IXGBE_RX_DESC(rx_ring, ntc));
427 int ixgbe_clean_rx_irq_zc(struct ixgbe_q_vector *q_vector,
428 struct ixgbe_ring *rx_ring,
431 unsigned int total_rx_bytes = 0, total_rx_packets = 0;
432 struct ixgbe_adapter *adapter = q_vector->adapter;
433 u16 cleaned_count = ixgbe_desc_unused(rx_ring);
434 unsigned int xdp_res, xdp_xmit = 0;
435 bool failure = false;
439 xdp.rxq = &rx_ring->xdp_rxq;
441 while (likely(total_rx_packets < budget)) {
442 union ixgbe_adv_rx_desc *rx_desc;
443 struct ixgbe_rx_buffer *bi;
446 /* return some buffers to hardware, one at a time is too slow */
447 if (cleaned_count >= IXGBE_RX_BUFFER_WRITE) {
449 !ixgbe_alloc_rx_buffers_fast_zc(rx_ring,
454 rx_desc = IXGBE_RX_DESC(rx_ring, rx_ring->next_to_clean);
455 size = le16_to_cpu(rx_desc->wb.upper.length);
459 /* This memory barrier is needed to keep us from reading
460 * any other fields out of the rx_desc until we know the
461 * descriptor has been written back
465 bi = ixgbe_get_rx_buffer_zc(rx_ring, size);
467 if (unlikely(!ixgbe_test_staterr(rx_desc,
468 IXGBE_RXD_STAT_EOP))) {
469 struct ixgbe_rx_buffer *next_bi;
471 ixgbe_reuse_rx_buffer_zc(rx_ring, bi);
472 ixgbe_inc_ntc(rx_ring);
474 &rx_ring->rx_buffer_info[rx_ring->next_to_clean];
475 next_bi->skb = ERR_PTR(-EINVAL);
479 if (unlikely(bi->skb)) {
480 ixgbe_reuse_rx_buffer_zc(rx_ring, bi);
481 ixgbe_inc_ntc(rx_ring);
486 xdp.data_meta = xdp.data;
487 xdp.data_hard_start = xdp.data - XDP_PACKET_HEADROOM;
488 xdp.data_end = xdp.data + size;
489 xdp.handle = bi->handle;
491 xdp_res = ixgbe_run_xdp_zc(adapter, rx_ring, &xdp);
494 if (xdp_res & (IXGBE_XDP_TX | IXGBE_XDP_REDIR)) {
499 ixgbe_reuse_rx_buffer_zc(rx_ring, bi);
502 total_rx_bytes += size;
505 ixgbe_inc_ntc(rx_ring);
510 skb = ixgbe_construct_skb_zc(rx_ring, bi, &xdp);
512 rx_ring->rx_stats.alloc_rx_buff_failed++;
517 ixgbe_inc_ntc(rx_ring);
519 if (eth_skb_pad(skb))
522 total_rx_bytes += skb->len;
525 ixgbe_process_skb_fields(rx_ring, rx_desc, skb);
526 ixgbe_rx_skb(q_vector, skb);
529 if (xdp_xmit & IXGBE_XDP_REDIR)
532 if (xdp_xmit & IXGBE_XDP_TX) {
533 struct ixgbe_ring *ring = adapter->xdp_ring[smp_processor_id()];
535 /* Force memory writes to complete before letting h/w
536 * know there are new descriptors to fetch.
539 writel(ring->next_to_use, ring->tail);
542 u64_stats_update_begin(&rx_ring->syncp);
543 rx_ring->stats.packets += total_rx_packets;
544 rx_ring->stats.bytes += total_rx_bytes;
545 u64_stats_update_end(&rx_ring->syncp);
546 q_vector->rx.total_packets += total_rx_packets;
547 q_vector->rx.total_bytes += total_rx_bytes;
549 if (xsk_umem_uses_need_wakeup(rx_ring->xsk_umem)) {
550 if (failure || rx_ring->next_to_clean == rx_ring->next_to_use)
551 xsk_set_rx_need_wakeup(rx_ring->xsk_umem);
553 xsk_clear_rx_need_wakeup(rx_ring->xsk_umem);
555 return (int)total_rx_packets;
557 return failure ? budget : (int)total_rx_packets;
560 void ixgbe_xsk_clean_rx_ring(struct ixgbe_ring *rx_ring)
562 u16 i = rx_ring->next_to_clean;
563 struct ixgbe_rx_buffer *bi = &rx_ring->rx_buffer_info[i];
565 while (i != rx_ring->next_to_alloc) {
566 xsk_umem_fq_reuse(rx_ring->xsk_umem, bi->handle);
569 if (i == rx_ring->count) {
571 bi = rx_ring->rx_buffer_info;
576 static bool ixgbe_xmit_zc(struct ixgbe_ring *xdp_ring, unsigned int budget)
578 union ixgbe_adv_tx_desc *tx_desc = NULL;
579 struct ixgbe_tx_buffer *tx_bi;
580 bool work_done = true;
581 struct xdp_desc desc;
585 while (budget-- > 0) {
586 if (unlikely(!ixgbe_desc_unused(xdp_ring)) ||
587 !netif_carrier_ok(xdp_ring->netdev)) {
592 if (!xsk_umem_consume_tx(xdp_ring->xsk_umem, &desc))
595 dma = xdp_umem_get_dma(xdp_ring->xsk_umem, desc.addr);
597 dma_sync_single_for_device(xdp_ring->dev, dma, desc.len,
600 tx_bi = &xdp_ring->tx_buffer_info[xdp_ring->next_to_use];
601 tx_bi->bytecount = desc.len;
605 tx_desc = IXGBE_TX_DESC(xdp_ring, xdp_ring->next_to_use);
606 tx_desc->read.buffer_addr = cpu_to_le64(dma);
608 /* put descriptor type bits */
609 cmd_type = IXGBE_ADVTXD_DTYP_DATA |
610 IXGBE_ADVTXD_DCMD_DEXT |
611 IXGBE_ADVTXD_DCMD_IFCS;
612 cmd_type |= desc.len | IXGBE_TXD_CMD;
613 tx_desc->read.cmd_type_len = cpu_to_le32(cmd_type);
614 tx_desc->read.olinfo_status =
615 cpu_to_le32(desc.len << IXGBE_ADVTXD_PAYLEN_SHIFT);
617 xdp_ring->next_to_use++;
618 if (xdp_ring->next_to_use == xdp_ring->count)
619 xdp_ring->next_to_use = 0;
623 ixgbe_xdp_ring_update_tail(xdp_ring);
624 xsk_umem_consume_tx_done(xdp_ring->xsk_umem);
625 if (xsk_umem_uses_need_wakeup(xdp_ring->xsk_umem))
626 xsk_clear_tx_need_wakeup(xdp_ring->xsk_umem);
629 return !!budget && work_done;
632 static void ixgbe_clean_xdp_tx_buffer(struct ixgbe_ring *tx_ring,
633 struct ixgbe_tx_buffer *tx_bi)
635 xdp_return_frame(tx_bi->xdpf);
636 dma_unmap_single(tx_ring->dev,
637 dma_unmap_addr(tx_bi, dma),
638 dma_unmap_len(tx_bi, len), DMA_TO_DEVICE);
639 dma_unmap_len_set(tx_bi, len, 0);
642 bool ixgbe_clean_xdp_tx_irq(struct ixgbe_q_vector *q_vector,
643 struct ixgbe_ring *tx_ring, int napi_budget)
645 u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use;
646 unsigned int total_packets = 0, total_bytes = 0;
647 struct xdp_umem *umem = tx_ring->xsk_umem;
648 union ixgbe_adv_tx_desc *tx_desc;
649 struct ixgbe_tx_buffer *tx_bi;
652 tx_bi = &tx_ring->tx_buffer_info[ntc];
653 tx_desc = IXGBE_TX_DESC(tx_ring, ntc);
656 if (!(tx_desc->wb.status & cpu_to_le32(IXGBE_TXD_STAT_DD)))
659 total_bytes += tx_bi->bytecount;
660 total_packets += tx_bi->gso_segs;
663 ixgbe_clean_xdp_tx_buffer(tx_ring, tx_bi);
672 if (unlikely(ntc == tx_ring->count)) {
674 tx_bi = tx_ring->tx_buffer_info;
675 tx_desc = IXGBE_TX_DESC(tx_ring, 0);
678 /* issue prefetch for next Tx descriptor */
682 tx_ring->next_to_clean = ntc;
684 u64_stats_update_begin(&tx_ring->syncp);
685 tx_ring->stats.bytes += total_bytes;
686 tx_ring->stats.packets += total_packets;
687 u64_stats_update_end(&tx_ring->syncp);
688 q_vector->tx.total_bytes += total_bytes;
689 q_vector->tx.total_packets += total_packets;
692 xsk_umem_complete_tx(umem, xsk_frames);
694 if (xsk_umem_uses_need_wakeup(tx_ring->xsk_umem)) {
695 if (tx_ring->next_to_clean == tx_ring->next_to_use)
696 xsk_set_tx_need_wakeup(tx_ring->xsk_umem);
698 xsk_clear_tx_need_wakeup(tx_ring->xsk_umem);
701 return ixgbe_xmit_zc(tx_ring, q_vector->tx.work_limit);
704 int ixgbe_xsk_wakeup(struct net_device *dev, u32 qid, u32 flags)
706 struct ixgbe_adapter *adapter = netdev_priv(dev);
707 struct ixgbe_ring *ring;
709 if (test_bit(__IXGBE_DOWN, &adapter->state))
712 if (!READ_ONCE(adapter->xdp_prog))
715 if (qid >= adapter->num_xdp_queues)
718 if (!adapter->xdp_ring[qid]->xsk_umem)
721 ring = adapter->xdp_ring[qid];
722 if (!napi_if_scheduled_mark_missed(&ring->q_vector->napi)) {
723 u64 eics = BIT_ULL(ring->q_vector->v_idx);
725 ixgbe_irq_rearm_queues(adapter, eics);
731 void ixgbe_xsk_clean_tx_ring(struct ixgbe_ring *tx_ring)
733 u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use;
734 struct xdp_umem *umem = tx_ring->xsk_umem;
735 struct ixgbe_tx_buffer *tx_bi;
739 tx_bi = &tx_ring->tx_buffer_info[ntc];
742 ixgbe_clean_xdp_tx_buffer(tx_ring, tx_bi);
749 if (ntc == tx_ring->count)
754 xsk_umem_complete_tx(umem, xsk_frames);