1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright(c) 2018 Intel Corporation. */
4 #include <linux/bpf_trace.h>
5 #include <net/xdp_sock_drv.h>
9 #include "i40e_txrx_common.h"
12 int i40e_alloc_rx_bi_zc(struct i40e_ring *rx_ring)
14 unsigned long sz = sizeof(*rx_ring->rx_bi_zc) * rx_ring->count;
16 rx_ring->rx_bi_zc = kzalloc(sz, GFP_KERNEL);
17 return rx_ring->rx_bi_zc ? 0 : -ENOMEM;
20 void i40e_clear_rx_bi_zc(struct i40e_ring *rx_ring)
22 memset(rx_ring->rx_bi_zc, 0,
23 sizeof(*rx_ring->rx_bi_zc) * rx_ring->count);
26 static struct xdp_buff **i40e_rx_bi(struct i40e_ring *rx_ring, u32 idx)
28 return &rx_ring->rx_bi_zc[idx];
32 * i40e_xsk_pool_enable - Enable/associate an AF_XDP buffer pool to a
36 * @qid: Rx ring to associate buffer pool with
38 * Returns 0 on success, <0 on failure
40 static int i40e_xsk_pool_enable(struct i40e_vsi *vsi,
41 struct xsk_buff_pool *pool,
44 struct net_device *netdev = vsi->netdev;
48 if (vsi->type != I40E_VSI_MAIN)
51 if (qid >= vsi->num_queue_pairs)
54 if (qid >= netdev->real_num_rx_queues ||
55 qid >= netdev->real_num_tx_queues)
58 err = xsk_pool_dma_map(pool, &vsi->back->pdev->dev, I40E_RX_DMA_ATTR);
62 set_bit(qid, vsi->af_xdp_zc_qps);
64 if_running = netif_running(vsi->netdev) && i40e_enabled_xdp_vsi(vsi);
67 err = i40e_queue_pair_disable(vsi, qid);
71 err = i40e_queue_pair_enable(vsi, qid);
75 /* Kick start the NAPI context so that receiving will start */
76 err = i40e_xsk_wakeup(vsi->netdev, qid, XDP_WAKEUP_RX);
85 * i40e_xsk_pool_disable - Disassociate an AF_XDP buffer pool from a
88 * @qid: Rx ring to associate buffer pool with
90 * Returns 0 on success, <0 on failure
92 static int i40e_xsk_pool_disable(struct i40e_vsi *vsi, u16 qid)
94 struct net_device *netdev = vsi->netdev;
95 struct xsk_buff_pool *pool;
99 pool = xsk_get_pool_from_qid(netdev, qid);
103 if_running = netif_running(vsi->netdev) && i40e_enabled_xdp_vsi(vsi);
106 err = i40e_queue_pair_disable(vsi, qid);
111 clear_bit(qid, vsi->af_xdp_zc_qps);
112 xsk_pool_dma_unmap(pool, I40E_RX_DMA_ATTR);
115 err = i40e_queue_pair_enable(vsi, qid);
124 * i40e_xsk_pool_setup - Enable/disassociate an AF_XDP buffer pool to/from
127 * @pool: Buffer pool to enable/associate to a ring, or NULL to disable
128 * @qid: Rx ring to (dis)associate buffer pool (from)to
130 * This function enables or disables a buffer pool to a certain ring.
132 * Returns 0 on success, <0 on failure
134 int i40e_xsk_pool_setup(struct i40e_vsi *vsi, struct xsk_buff_pool *pool,
137 return pool ? i40e_xsk_pool_enable(vsi, pool, qid) :
138 i40e_xsk_pool_disable(vsi, qid);
142 * i40e_run_xdp_zc - Executes an XDP program on an xdp_buff
144 * @xdp: xdp_buff used as input to the XDP program
146 * Returns any of I40E_XDP_{PASS, CONSUMED, TX, REDIR}
148 static int i40e_run_xdp_zc(struct i40e_ring *rx_ring, struct xdp_buff *xdp)
150 int err, result = I40E_XDP_PASS;
151 struct i40e_ring *xdp_ring;
152 struct bpf_prog *xdp_prog;
156 /* NB! xdp_prog will always be !NULL, due to the fact that
157 * this path is enabled by setting an XDP program.
159 xdp_prog = READ_ONCE(rx_ring->xdp_prog);
160 act = bpf_prog_run_xdp(xdp_prog, xdp);
166 xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->queue_index];
167 result = i40e_xmit_xdp_tx_ring(xdp, xdp_ring);
170 err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog);
171 result = !err ? I40E_XDP_REDIR : I40E_XDP_CONSUMED;
174 bpf_warn_invalid_xdp_action(act);
177 trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
178 fallthrough; /* handle aborts by dropping packet */
180 result = I40E_XDP_CONSUMED;
187 bool i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 count)
189 u16 ntu = rx_ring->next_to_use;
190 union i40e_rx_desc *rx_desc;
191 struct xdp_buff **bi, *xdp;
195 rx_desc = I40E_RX_DESC(rx_ring, ntu);
196 bi = i40e_rx_bi(rx_ring, ntu);
198 xdp = xsk_buff_alloc(rx_ring->xsk_pool);
204 dma = xsk_buff_xdp_get_dma(xdp);
205 rx_desc->read.pkt_addr = cpu_to_le64(dma);
206 rx_desc->read.hdr_addr = 0;
212 if (unlikely(ntu == rx_ring->count)) {
213 rx_desc = I40E_RX_DESC(rx_ring, 0);
214 bi = i40e_rx_bi(rx_ring, 0);
222 if (rx_ring->next_to_use != ntu)
223 i40e_release_rx_desc(rx_ring, ntu);
229 * i40e_construct_skb_zc - Create skbuff from zero-copy Rx buffer
233 * This functions allocates a new skb from a zero-copy Rx buffer.
235 * Returns the skb, or NULL on failure.
237 static struct sk_buff *i40e_construct_skb_zc(struct i40e_ring *rx_ring,
238 struct xdp_buff *xdp)
240 unsigned int metasize = xdp->data - xdp->data_meta;
241 unsigned int datasize = xdp->data_end - xdp->data;
244 /* allocate a skb to store the frags */
245 skb = __napi_alloc_skb(&rx_ring->q_vector->napi,
246 xdp->data_end - xdp->data_hard_start,
247 GFP_ATOMIC | __GFP_NOWARN);
251 skb_reserve(skb, xdp->data - xdp->data_hard_start);
252 memcpy(__skb_put(skb, datasize), xdp->data, datasize);
254 skb_metadata_set(skb, metasize);
261 * i40e_inc_ntc: Advance the next_to_clean index
264 static void i40e_inc_ntc(struct i40e_ring *rx_ring)
266 u32 ntc = rx_ring->next_to_clean + 1;
268 ntc = (ntc < rx_ring->count) ? ntc : 0;
269 rx_ring->next_to_clean = ntc;
273 * i40e_clean_rx_irq_zc - Consumes Rx packets from the hardware ring
275 * @budget: NAPI budget
277 * Returns amount of work completed
279 int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)
281 unsigned int total_rx_bytes = 0, total_rx_packets = 0;
282 u16 cleaned_count = I40E_DESC_UNUSED(rx_ring);
283 unsigned int xdp_res, xdp_xmit = 0;
284 bool failure = false;
287 while (likely(total_rx_packets < (unsigned int)budget)) {
288 union i40e_rx_desc *rx_desc;
289 struct xdp_buff **bi;
293 rx_desc = I40E_RX_DESC(rx_ring, rx_ring->next_to_clean);
294 qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
296 /* This memory barrier is needed to keep us from reading
297 * any other fields out of the rx_desc until we have
298 * verified the descriptor has been written back.
302 if (i40e_rx_is_programming_status(qword)) {
303 i40e_clean_programming_status(rx_ring,
304 rx_desc->raw.qword[0],
306 bi = i40e_rx_bi(rx_ring, rx_ring->next_to_clean);
310 i40e_inc_ntc(rx_ring);
314 bi = i40e_rx_bi(rx_ring, rx_ring->next_to_clean);
315 size = (qword & I40E_RXD_QW1_LENGTH_PBUF_MASK) >>
316 I40E_RXD_QW1_LENGTH_PBUF_SHIFT;
320 bi = i40e_rx_bi(rx_ring, rx_ring->next_to_clean);
321 (*bi)->data_end = (*bi)->data + size;
322 xsk_buff_dma_sync_for_cpu(*bi, rx_ring->xsk_pool);
324 xdp_res = i40e_run_xdp_zc(rx_ring, *bi);
326 if (xdp_res & (I40E_XDP_TX | I40E_XDP_REDIR))
332 total_rx_bytes += size;
336 i40e_inc_ntc(rx_ring);
342 /* NB! We are not checking for errors using
343 * i40e_test_staterr with
344 * BIT(I40E_RXD_QW1_ERROR_SHIFT). This is due to that
345 * SBP is *not* set in PRT_SBPVSI (default not set).
347 skb = i40e_construct_skb_zc(rx_ring, *bi);
350 rx_ring->rx_stats.alloc_buff_failed++;
355 i40e_inc_ntc(rx_ring);
357 if (eth_skb_pad(skb))
360 total_rx_bytes += skb->len;
363 i40e_process_skb_fields(rx_ring, rx_desc, skb);
364 napi_gro_receive(&rx_ring->q_vector->napi, skb);
367 if (cleaned_count >= I40E_RX_BUFFER_WRITE)
368 failure = !i40e_alloc_rx_buffers_zc(rx_ring, cleaned_count);
370 i40e_finalize_xdp_rx(rx_ring, xdp_xmit);
371 i40e_update_rx_stats(rx_ring, total_rx_bytes, total_rx_packets);
373 if (xsk_uses_need_wakeup(rx_ring->xsk_pool)) {
374 if (failure || rx_ring->next_to_clean == rx_ring->next_to_use)
375 xsk_set_rx_need_wakeup(rx_ring->xsk_pool);
377 xsk_clear_rx_need_wakeup(rx_ring->xsk_pool);
379 return (int)total_rx_packets;
381 return failure ? budget : (int)total_rx_packets;
385 * i40e_xmit_zc - Performs zero-copy Tx AF_XDP
386 * @xdp_ring: XDP Tx ring
387 * @budget: NAPI budget
389 * Returns true if the work is finished.
391 static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget)
393 unsigned int sent_frames = 0, total_bytes = 0;
394 struct i40e_tx_desc *tx_desc = NULL;
395 struct i40e_tx_buffer *tx_bi;
396 struct xdp_desc desc;
399 while (budget-- > 0) {
400 if (!xsk_tx_peek_desc(xdp_ring->xsk_pool, &desc))
403 dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc.addr);
404 xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma,
407 tx_bi = &xdp_ring->tx_bi[xdp_ring->next_to_use];
408 tx_bi->bytecount = desc.len;
410 tx_desc = I40E_TX_DESC(xdp_ring, xdp_ring->next_to_use);
411 tx_desc->buffer_addr = cpu_to_le64(dma);
412 tx_desc->cmd_type_offset_bsz =
413 build_ctob(I40E_TX_DESC_CMD_ICRC
414 | I40E_TX_DESC_CMD_EOP,
418 total_bytes += tx_bi->bytecount;
420 xdp_ring->next_to_use++;
421 if (xdp_ring->next_to_use == xdp_ring->count)
422 xdp_ring->next_to_use = 0;
426 /* Request an interrupt for the last frame and bump tail ptr. */
427 tx_desc->cmd_type_offset_bsz |= (I40E_TX_DESC_CMD_RS <<
428 I40E_TXD_QW1_CMD_SHIFT);
429 i40e_xdp_ring_update_tail(xdp_ring);
431 xsk_tx_release(xdp_ring->xsk_pool);
432 i40e_update_tx_stats(xdp_ring, sent_frames, total_bytes);
439 * i40e_clean_xdp_tx_buffer - Frees and unmaps an XDP Tx entry
440 * @tx_ring: XDP Tx ring
441 * @tx_bi: Tx buffer info to clean
443 static void i40e_clean_xdp_tx_buffer(struct i40e_ring *tx_ring,
444 struct i40e_tx_buffer *tx_bi)
446 xdp_return_frame(tx_bi->xdpf);
447 tx_ring->xdp_tx_active--;
448 dma_unmap_single(tx_ring->dev,
449 dma_unmap_addr(tx_bi, dma),
450 dma_unmap_len(tx_bi, len), DMA_TO_DEVICE);
451 dma_unmap_len_set(tx_bi, len, 0);
455 * i40e_clean_xdp_tx_irq - Completes AF_XDP entries, and cleans XDP entries
457 * @tx_ring: XDP Tx ring
459 * Returns true if cleanup/tranmission is done.
461 bool i40e_clean_xdp_tx_irq(struct i40e_vsi *vsi, struct i40e_ring *tx_ring)
463 struct xsk_buff_pool *bp = tx_ring->xsk_pool;
464 u32 i, completed_frames, xsk_frames = 0;
465 u32 head_idx = i40e_get_head(tx_ring);
466 struct i40e_tx_buffer *tx_bi;
469 if (head_idx < tx_ring->next_to_clean)
470 head_idx += tx_ring->count;
471 completed_frames = head_idx - tx_ring->next_to_clean;
473 if (completed_frames == 0)
476 if (likely(!tx_ring->xdp_tx_active)) {
477 xsk_frames = completed_frames;
481 ntc = tx_ring->next_to_clean;
483 for (i = 0; i < completed_frames; i++) {
484 tx_bi = &tx_ring->tx_bi[ntc];
487 i40e_clean_xdp_tx_buffer(tx_ring, tx_bi);
493 if (++ntc >= tx_ring->count)
498 tx_ring->next_to_clean += completed_frames;
499 if (unlikely(tx_ring->next_to_clean >= tx_ring->count))
500 tx_ring->next_to_clean -= tx_ring->count;
503 xsk_tx_completed(bp, xsk_frames);
505 i40e_arm_wb(tx_ring, vsi, completed_frames);
508 if (xsk_uses_need_wakeup(tx_ring->xsk_pool))
509 xsk_set_tx_need_wakeup(tx_ring->xsk_pool);
511 return i40e_xmit_zc(tx_ring, I40E_DESC_UNUSED(tx_ring));
515 * i40e_xsk_wakeup - Implements the ndo_xsk_wakeup
516 * @dev: the netdevice
517 * @queue_id: queue id to wake up
518 * @flags: ignored in our case since we have Rx and Tx in the same NAPI.
520 * Returns <0 for errors, 0 otherwise.
522 int i40e_xsk_wakeup(struct net_device *dev, u32 queue_id, u32 flags)
524 struct i40e_netdev_priv *np = netdev_priv(dev);
525 struct i40e_vsi *vsi = np->vsi;
526 struct i40e_pf *pf = vsi->back;
527 struct i40e_ring *ring;
529 if (test_bit(__I40E_CONFIG_BUSY, pf->state))
532 if (test_bit(__I40E_VSI_DOWN, vsi->state))
535 if (!i40e_enabled_xdp_vsi(vsi))
538 if (queue_id >= vsi->num_queue_pairs)
541 if (!vsi->xdp_rings[queue_id]->xsk_pool)
544 ring = vsi->xdp_rings[queue_id];
546 /* The idea here is that if NAPI is running, mark a miss, so
547 * it will run again. If not, trigger an interrupt and
548 * schedule the NAPI from interrupt context. If NAPI would be
549 * scheduled here, the interrupt affinity would not be
552 if (!napi_if_scheduled_mark_missed(&ring->q_vector->napi))
553 i40e_force_wb(vsi, ring->q_vector);
558 void i40e_xsk_clean_rx_ring(struct i40e_ring *rx_ring)
562 for (i = 0; i < rx_ring->count; i++) {
563 struct xdp_buff *rx_bi = *i40e_rx_bi(rx_ring, i);
568 xsk_buff_free(rx_bi);
574 * i40e_xsk_clean_xdp_ring - Clean the XDP Tx ring on shutdown
575 * @tx_ring: XDP Tx ring
577 void i40e_xsk_clean_tx_ring(struct i40e_ring *tx_ring)
579 u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use;
580 struct xsk_buff_pool *bp = tx_ring->xsk_pool;
581 struct i40e_tx_buffer *tx_bi;
585 tx_bi = &tx_ring->tx_bi[ntc];
588 i40e_clean_xdp_tx_buffer(tx_ring, tx_bi);
595 if (ntc >= tx_ring->count)
600 xsk_tx_completed(bp, xsk_frames);
604 * i40e_xsk_any_rx_ring_enabled - Checks if Rx rings have an AF_XDP
605 * buffer pool attached
608 * Returns true if any of the Rx rings has an AF_XDP buffer pool attached
610 bool i40e_xsk_any_rx_ring_enabled(struct i40e_vsi *vsi)
612 struct net_device *netdev = vsi->netdev;
615 for (i = 0; i < vsi->num_queue_pairs; i++) {
616 if (xsk_get_pool_from_qid(netdev, i))