2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2015-2020 Amazon.com, Inc. or its affiliates.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
36 #include "ena_netmap.h"
38 #define ENA_NETMAP_MORE_FRAMES 1
39 #define ENA_NETMAP_NO_MORE_FRAMES 0
40 #define ENA_MAX_FRAMES 16384
42 struct ena_netmap_ctx {
43 struct netmap_kring *kring;
44 struct ena_adapter *adapter;
45 struct netmap_adapter *na;
46 struct netmap_slot *slots;
47 struct ena_ring *ring;
48 struct ena_com_io_cq *io_cq;
49 struct ena_com_io_sq *io_sq;
55 /* Netmap callbacks */
56 static int ena_netmap_reg(struct netmap_adapter *, int);
57 static int ena_netmap_txsync(struct netmap_kring *, int);
58 static int ena_netmap_rxsync(struct netmap_kring *, int);
60 /* Helper functions */
61 static int ena_netmap_tx_frames(struct ena_netmap_ctx *);
62 static int ena_netmap_tx_frame(struct ena_netmap_ctx *);
63 static inline uint16_t ena_netmap_count_slots(struct ena_netmap_ctx *);
64 static inline uint16_t ena_netmap_packet_len(struct netmap_slot *, u_int,
66 static int ena_netmap_copy_data(struct netmap_adapter *, struct netmap_slot *,
67 u_int, uint16_t, uint16_t, void *);
68 static int ena_netmap_map_single_slot(struct netmap_adapter *,
69 struct netmap_slot *, bus_dma_tag_t, bus_dmamap_t, void **, uint64_t *);
70 static int ena_netmap_tx_map_slots(struct ena_netmap_ctx *,
71 struct ena_tx_buffer *, void **, uint16_t *, uint16_t *);
72 static void ena_netmap_unmap_last_socket_chain(struct ena_netmap_ctx *,
73 struct ena_tx_buffer *);
74 static void ena_netmap_tx_cleanup(struct ena_netmap_ctx *);
75 static uint16_t ena_netmap_tx_clean_one(struct ena_netmap_ctx *, uint16_t);
76 static inline int validate_tx_req_id(struct ena_ring *, uint16_t);
77 static int ena_netmap_rx_frames(struct ena_netmap_ctx *);
78 static int ena_netmap_rx_frame(struct ena_netmap_ctx *);
79 static int ena_netmap_rx_load_desc(struct ena_netmap_ctx *, uint16_t, int *);
80 static void ena_netmap_rx_cleanup(struct ena_netmap_ctx *);
81 static void ena_netmap_fill_ctx(struct netmap_kring *, struct ena_netmap_ctx *,
85 ena_netmap_attach(struct ena_adapter *adapter)
87 struct netmap_adapter na;
89 ena_log_nm(adapter->pdev, INFO, "netmap attach\n");
91 bzero(&na, sizeof(na));
92 na.na_flags = NAF_MOREFRAG;
93 na.ifp = adapter->ifp;
94 na.num_tx_desc = adapter->requested_tx_ring_size;
95 na.num_rx_desc = adapter->requested_rx_ring_size;
96 na.num_tx_rings = adapter->num_io_queues;
97 na.num_rx_rings = adapter->num_io_queues;
98 na.rx_buf_maxsize = adapter->buf_ring_size;
99 na.nm_txsync = ena_netmap_txsync;
100 na.nm_rxsync = ena_netmap_rxsync;
101 na.nm_register = ena_netmap_reg;
103 return (netmap_attach(&na));
107 ena_netmap_alloc_rx_slot(struct ena_adapter *adapter, struct ena_ring *rx_ring,
108 struct ena_rx_buffer *rx_info)
110 struct netmap_adapter *na = NA(adapter->ifp);
111 struct netmap_kring *kring;
112 struct netmap_ring *ring;
113 struct netmap_slot *slot;
116 int nm_i, qid, head, lim, rc;
118 /* if previously allocated frag is not used */
119 if (unlikely(rx_info->netmap_buf_idx != 0))
123 kring = na->rx_rings[qid];
124 nm_i = kring->nr_hwcur;
127 ena_log_nm(adapter->pdev, DBG,
128 "nr_hwcur: %d, nr_hwtail: %d, rhead: %d, rcur: %d, rtail: %d\n",
129 kring->nr_hwcur, kring->nr_hwtail, kring->rhead, kring->rcur,
132 if ((nm_i == head) && rx_ring->initialized) {
133 ena_log_nm(adapter->pdev, ERR,
134 "No free slots in netmap ring\n");
140 ena_log_nm(adapter->pdev, ERR, "Rx ring %d is NULL\n", qid);
143 slot = &ring->slot[nm_i];
145 addr = PNMB(na, slot, &paddr);
146 if (addr == NETMAP_BUF_BASE(na)) {
147 ena_log_nm(adapter->pdev, ERR, "Bad buff in slot\n");
151 rc = netmap_load_map(na, adapter->rx_buf_tag, rx_info->map, addr);
153 ena_log_nm(adapter->pdev, WARN, "DMA mapping error\n");
156 bus_dmamap_sync(adapter->rx_buf_tag, rx_info->map, BUS_DMASYNC_PREREAD);
158 rx_info->ena_buf.paddr = paddr;
159 rx_info->ena_buf.len = ring->nr_buf_size;
160 rx_info->mbuf = NULL;
161 rx_info->netmap_buf_idx = slot->buf_idx;
165 lim = kring->nkr_num_slots - 1;
166 kring->nr_hwcur = nm_next(nm_i, lim);
172 ena_netmap_free_rx_slot(struct ena_adapter *adapter, struct ena_ring *rx_ring,
173 struct ena_rx_buffer *rx_info)
175 struct netmap_adapter *na;
176 struct netmap_kring *kring;
177 struct netmap_slot *slot;
180 na = NA(adapter->ifp);
182 ena_log_nm(adapter->pdev, ERR, "netmap adapter is NULL\n");
186 if (na->rx_rings == NULL) {
187 ena_log_nm(adapter->pdev, ERR, "netmap rings are NULL\n");
192 kring = na->rx_rings[qid];
194 ena_log_nm(adapter->pdev, ERR,
195 "netmap kernel ring %d is NULL\n", qid);
199 lim = kring->nkr_num_slots - 1;
200 nm_i = nm_prev(kring->nr_hwcur, lim);
202 if (kring->nr_mode != NKR_NETMAP_ON)
205 bus_dmamap_sync(adapter->rx_buf_tag, rx_info->map,
206 BUS_DMASYNC_POSTREAD);
207 netmap_unload_map(na, adapter->rx_buf_tag, rx_info->map);
209 KASSERT(kring->ring != NULL, ("Netmap Rx ring is NULL\n"));
211 slot = &kring->ring->slot[nm_i];
213 ENA_WARN(slot->buf_idx != 0, adapter->ena_dev, "Overwrite slot buf\n");
214 slot->buf_idx = rx_info->netmap_buf_idx;
215 slot->flags = NS_BUF_CHANGED;
217 rx_info->netmap_buf_idx = 0;
218 kring->nr_hwcur = nm_i;
222 ena_ring_in_netmap(struct ena_adapter *adapter, int qid, enum txrx x)
224 struct netmap_adapter *na;
225 struct netmap_kring *kring;
227 if (if_getcapenable(adapter->ifp) & IFCAP_NETMAP) {
228 na = NA(adapter->ifp);
229 kring = (x == NR_RX) ? na->rx_rings[qid] : na->tx_rings[qid];
230 if (kring->nr_mode == NKR_NETMAP_ON)
237 ena_tx_ring_in_netmap(struct ena_adapter *adapter, int qid)
239 return ena_ring_in_netmap(adapter, qid, NR_TX);
243 ena_rx_ring_in_netmap(struct ena_adapter *adapter, int qid)
245 return ena_ring_in_netmap(adapter, qid, NR_RX);
249 ena_netmap_reset_ring(struct ena_adapter *adapter, int qid, enum txrx x)
251 if (!ena_ring_in_netmap(adapter, qid, x))
254 netmap_reset(NA(adapter->ifp), x, qid, 0);
255 ena_log_nm(adapter->pdev, INFO, "%s ring %d is in netmap mode\n",
256 (x == NR_TX) ? "Tx" : "Rx", qid);
260 ena_netmap_reset_rx_ring(struct ena_adapter *adapter, int qid)
262 ena_netmap_reset_ring(adapter, qid, NR_RX);
266 ena_netmap_reset_tx_ring(struct ena_adapter *adapter, int qid)
268 ena_netmap_reset_ring(adapter, qid, NR_TX);
272 ena_netmap_reg(struct netmap_adapter *na, int onoff)
275 struct ena_adapter *adapter = if_getsoftc(ifp);
276 device_t pdev = adapter->pdev;
277 struct netmap_kring *kring;
282 ENA_FLAG_CLEAR_ATOMIC(ENA_FLAG_TRIGGER_RESET, adapter);
286 ena_log_nm(pdev, INFO, "netmap on\n");
288 for (i = 0; i <= nma_get_nrings(na, t); i++) {
289 kring = NMR(na, t)[i];
290 if (nm_kring_pending_on(kring)) {
291 kring->nr_mode = NKR_NETMAP_ON;
295 nm_set_native_flags(na);
297 ena_log_nm(pdev, INFO, "netmap off\n");
298 nm_clear_native_flags(na);
300 for (i = 0; i <= nma_get_nrings(na, t); i++) {
301 kring = NMR(na, t)[i];
302 if (nm_kring_pending_off(kring)) {
303 kring->nr_mode = NKR_NETMAP_OFF;
309 rc = ena_up(adapter);
311 ena_log_nm(pdev, WARN, "ena_up failed with rc=%d\n", rc);
312 adapter->reset_reason = ENA_REGS_RESET_DRIVER_INVALID_STATE;
313 nm_clear_native_flags(na);
314 ena_destroy_device(adapter, false);
315 ENA_FLAG_SET_ATOMIC(ENA_FLAG_DEV_UP_BEFORE_RESET, adapter);
316 rc = ena_restore_device(adapter);
324 ena_netmap_txsync(struct netmap_kring *kring, int flags)
326 struct ena_netmap_ctx ctx;
329 ena_netmap_fill_ctx(kring, &ctx, ENA_IO_TXQ_IDX(kring->ring_id));
330 ctx.ring = &ctx.adapter->tx_ring[kring->ring_id];
332 ENA_RING_MTX_LOCK(ctx.ring);
333 if (unlikely(!ENA_FLAG_ISSET(ENA_FLAG_DEV_UP, ctx.adapter)))
336 if (unlikely(!ENA_FLAG_ISSET(ENA_FLAG_LINK_UP, ctx.adapter)))
339 rc = ena_netmap_tx_frames(&ctx);
340 ena_netmap_tx_cleanup(&ctx);
343 ENA_RING_MTX_UNLOCK(ctx.ring);
348 ena_netmap_tx_frames(struct ena_netmap_ctx *ctx)
350 struct ena_ring *tx_ring = ctx->ring;
353 ctx->nm_i = ctx->kring->nr_hwcur;
354 ctx->nt = ctx->ring->next_to_use;
356 __builtin_prefetch(&ctx->slots[ctx->nm_i]);
358 while (ctx->nm_i != ctx->kring->rhead) {
359 if ((rc = ena_netmap_tx_frame(ctx)) != 0) {
361 * When there is no empty space in Tx ring, error is
362 * still being returned. It should not be passed to the
363 * netmap, as application knows current ring state from
364 * netmap ring pointers. Returning error there could
365 * cause application to exit, but the Tx ring is
366 * commonly being full.
368 if (rc == ENA_COM_NO_MEM)
372 tx_ring->acum_pkts++;
375 /* If any packet was sent... */
376 if (likely(ctx->nm_i != ctx->kring->nr_hwcur)) {
377 /* ...send the doorbell to the device. */
378 ena_ring_tx_doorbell(tx_ring);
380 ctx->ring->next_to_use = ctx->nt;
381 ctx->kring->nr_hwcur = ctx->nm_i;
388 ena_netmap_tx_frame(struct ena_netmap_ctx *ctx)
390 struct ena_com_tx_ctx ena_tx_ctx;
391 struct ena_adapter *adapter;
392 struct ena_ring *tx_ring;
393 struct ena_tx_buffer *tx_info;
401 adapter = ctx->adapter;
402 if (ena_netmap_count_slots(ctx) > adapter->max_tx_sgl_size) {
403 ena_log_nm(adapter->pdev, WARN, "Too many slots per packet\n");
409 req_id = tx_ring->free_tx_ids[ctx->nt];
410 tx_info = &tx_ring->tx_buffer_info[req_id];
411 tx_info->num_of_bufs = 0;
412 tx_info->nm_info.sockets_used = 0;
414 rc = ena_netmap_tx_map_slots(ctx, tx_info, &push_hdr, &header_len,
416 if (unlikely(rc != 0)) {
417 ena_log_nm(adapter->pdev, ERR, "Failed to map Tx slot\n");
421 bzero(&ena_tx_ctx, sizeof(struct ena_com_tx_ctx));
422 ena_tx_ctx.ena_bufs = tx_info->bufs;
423 ena_tx_ctx.push_header = push_hdr;
424 ena_tx_ctx.num_bufs = tx_info->num_of_bufs;
425 ena_tx_ctx.req_id = req_id;
426 ena_tx_ctx.header_len = header_len;
427 ena_tx_ctx.meta_valid = adapter->disable_meta_caching;
429 /* There are no any offloads, as the netmap doesn't support them */
431 if (tx_ring->acum_pkts == ENA_DB_THRESHOLD ||
432 ena_com_is_doorbell_needed(ctx->io_sq, &ena_tx_ctx))
433 ena_ring_tx_doorbell(tx_ring);
435 rc = ena_com_prepare_tx(ctx->io_sq, &ena_tx_ctx, &nb_hw_desc);
436 if (unlikely(rc != 0)) {
437 if (likely(rc == ENA_COM_NO_MEM)) {
438 ena_log_nm(adapter->pdev, DBG,
439 "Tx ring[%d] is out of space\n", tx_ring->que->id);
441 ena_log_nm(adapter->pdev, ERR,
442 "Failed to prepare Tx bufs\n");
443 ena_trigger_reset(adapter,
444 ENA_REGS_RESET_DRIVER_INVALID_STATE);
446 counter_u64_add(tx_ring->tx_stats.prepare_ctx_err, 1);
448 ena_netmap_unmap_last_socket_chain(ctx, tx_info);
453 counter_u64_add_protected(tx_ring->tx_stats.cnt, 1);
454 counter_u64_add_protected(tx_ring->tx_stats.bytes, packet_len);
455 counter_u64_add_protected(adapter->hw_stats.tx_packets, 1);
456 counter_u64_add_protected(adapter->hw_stats.tx_bytes, packet_len);
459 tx_info->tx_descs = nb_hw_desc;
461 ctx->nt = ENA_TX_RING_IDX_NEXT(ctx->nt, ctx->ring->ring_size);
463 for (unsigned int i = 0; i < tx_info->num_of_bufs; i++)
464 bus_dmamap_sync(adapter->tx_buf_tag,
465 tx_info->nm_info.map_seg[i], BUS_DMASYNC_PREWRITE);
470 static inline uint16_t
471 ena_netmap_count_slots(struct ena_netmap_ctx *ctx)
474 uint16_t nm = ctx->nm_i;
476 while ((ctx->slots[nm].flags & NS_MOREFRAG) != 0) {
478 nm = nm_next(nm, ctx->lim);
484 static inline uint16_t
485 ena_netmap_packet_len(struct netmap_slot *slots, u_int slot_index,
488 struct netmap_slot *nm_slot;
489 uint16_t packet_size = 0;
492 nm_slot = &slots[slot_index];
493 packet_size += nm_slot->len;
494 slot_index = nm_next(slot_index, limit);
495 } while ((nm_slot->flags & NS_MOREFRAG) != 0);
501 ena_netmap_copy_data(struct netmap_adapter *na, struct netmap_slot *slots,
502 u_int slot_index, uint16_t limit, uint16_t bytes_to_copy, void *destination)
504 struct netmap_slot *nm_slot;
506 uint16_t data_amount;
509 nm_slot = &slots[slot_index];
510 slot_vaddr = NMB(na, nm_slot);
511 if (unlikely(slot_vaddr == NULL))
514 data_amount = min_t(uint16_t, bytes_to_copy, nm_slot->len);
515 memcpy(destination, slot_vaddr, data_amount);
516 bytes_to_copy -= data_amount;
518 slot_index = nm_next(slot_index, limit);
519 } while ((nm_slot->flags & NS_MOREFRAG) != 0 && bytes_to_copy > 0);
525 ena_netmap_map_single_slot(struct netmap_adapter *na, struct netmap_slot *slot,
526 bus_dma_tag_t dmatag, bus_dmamap_t dmamap, void **vaddr, uint64_t *paddr)
531 pdev = ((struct ena_adapter *)if_getsoftc(na->ifp))->pdev;
533 *vaddr = PNMB(na, slot, paddr);
534 if (unlikely(vaddr == NULL)) {
535 ena_log_nm(pdev, ERR, "Slot address is NULL\n");
539 rc = netmap_load_map(na, dmatag, dmamap, *vaddr);
540 if (unlikely(rc != 0)) {
541 ena_log_nm(pdev, ERR, "Failed to map slot %d for DMA\n",
550 ena_netmap_tx_map_slots(struct ena_netmap_ctx *ctx,
551 struct ena_tx_buffer *tx_info, void **push_hdr, uint16_t *header_len,
552 uint16_t *packet_len)
554 struct netmap_slot *slot;
555 struct ena_com_buf *ena_buf;
556 struct ena_adapter *adapter;
557 struct ena_ring *tx_ring;
558 struct ena_netmap_tx_info *nm_info;
559 bus_dmamap_t *nm_maps;
562 uint32_t *nm_buf_idx;
563 uint32_t slot_head_len;
565 uint32_t remaining_len;
570 adapter = ctx->adapter;
572 ena_buf = tx_info->bufs;
573 nm_info = &tx_info->nm_info;
574 nm_maps = nm_info->map_seg;
575 nm_buf_idx = nm_info->socket_buf_idx;
576 slot = &ctx->slots[ctx->nm_i];
578 slot_head_len = slot->len;
579 *packet_len = ena_netmap_packet_len(ctx->slots, ctx->nm_i, ctx->lim);
580 remaining_len = *packet_len;
583 __builtin_prefetch(&ctx->slots[ctx->nm_i + 1]);
584 if (tx_ring->tx_mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV) {
586 * When the device is in LLQ mode, the driver will copy
587 * the header into the device memory space.
588 * The ena_com layer assumes that the header is in a linear
590 * This assumption might be wrong since part of the header
591 * can be in the fragmented buffers.
592 * First, check if header fits in the first slot. If not, copy
593 * it to separate buffer that will be holding linearized data.
595 push_len = min_t(uint32_t, *packet_len,
596 tx_ring->tx_max_header_size);
597 *header_len = push_len;
598 /* If header is in linear space, just point to socket's data. */
599 if (likely(push_len <= slot_head_len)) {
600 *push_hdr = NMB(ctx->na, slot);
601 if (unlikely(push_hdr == NULL)) {
602 ena_log_nm(adapter->pdev, ERR,
603 "Slot vaddress is NULL\n");
607 * Otherwise, copy whole portion of header from multiple
608 * slots to intermediate buffer.
611 rc = ena_netmap_copy_data(ctx->na, ctx->slots,
612 ctx->nm_i, ctx->lim, push_len,
613 tx_ring->push_buf_intermediate_buf);
615 ena_log_nm(adapter->pdev, ERR,
616 "Failed to copy data from slots to push_buf\n");
620 *push_hdr = tx_ring->push_buf_intermediate_buf;
621 counter_u64_add(tx_ring->tx_stats.llq_buffer_copy, 1);
623 delta = push_len - slot_head_len;
626 ena_log_nm(adapter->pdev, DBG,
627 "slot: %d header_buf->vaddr: %p push_len: %d\n",
628 slot->buf_idx, *push_hdr, push_len);
631 * If header was in linear memory space, map for the dma rest of
632 * the data in the first mbuf of the mbuf chain.
634 if (slot_head_len > push_len) {
635 rc = ena_netmap_map_single_slot(ctx->na, slot,
636 adapter->tx_buf_tag, *nm_maps, &vaddr, &paddr);
637 if (unlikely(rc != 0)) {
638 ena_log_nm(adapter->pdev, ERR,
639 "DMA mapping error\n");
644 ena_buf->paddr = paddr + push_len;
645 ena_buf->len = slot->len - push_len;
648 tx_info->num_of_bufs++;
651 remaining_len -= slot->len;
653 /* Save buf idx before advancing */
654 *nm_buf_idx = slot->buf_idx;
658 /* Advance to the next socket */
659 ctx->nm_i = nm_next(ctx->nm_i, ctx->lim);
660 slot = &ctx->slots[ctx->nm_i];
661 nm_info->sockets_used++;
664 * If header is in non linear space (delta > 0), then skip mbufs
665 * containing header and map the last one containing both header
666 * and the packet data.
667 * The first segment is already counted in.
670 __builtin_prefetch(&ctx->slots[ctx->nm_i + 1]);
671 frag_len = slot->len;
674 * If whole segment contains header just move to the
675 * next one and reduce delta.
677 if (unlikely(delta >= frag_len)) {
681 * Map the data and then assign it with the
684 rc = ena_netmap_map_single_slot(ctx->na, slot,
685 adapter->tx_buf_tag, *nm_maps, &vaddr,
687 if (unlikely(rc != 0)) {
688 ena_log_nm(adapter->pdev, ERR,
689 "DMA mapping error\n");
694 ena_buf->paddr = paddr + delta;
695 ena_buf->len = slot->len - delta;
698 tx_info->num_of_bufs++;
702 remaining_len -= slot->len;
704 /* Save buf idx before advancing */
705 *nm_buf_idx = slot->buf_idx;
709 /* Advance to the next socket */
710 ctx->nm_i = nm_next(ctx->nm_i, ctx->lim);
711 slot = &ctx->slots[ctx->nm_i];
712 nm_info->sockets_used++;
717 * header_len is just a hint for the device. Because netmap is
718 * not giving us any information about packet header length and
719 * it is not guaranteed that all packet headers will be in the
720 * 1st slot, setting header_len to 0 is making the device ignore
721 * this value and resolve header on it's own.
726 /* Map all remaining data (regular routine for non-LLQ mode) */
727 while (remaining_len > 0) {
728 __builtin_prefetch(&ctx->slots[ctx->nm_i + 1]);
730 rc = ena_netmap_map_single_slot(ctx->na, slot,
731 adapter->tx_buf_tag, *nm_maps, &vaddr, &paddr);
732 if (unlikely(rc != 0)) {
733 ena_log_nm(adapter->pdev, ERR, "DMA mapping error\n");
738 ena_buf->paddr = paddr;
739 ena_buf->len = slot->len;
742 tx_info->num_of_bufs++;
744 remaining_len -= slot->len;
746 /* Save buf idx before advancing */
747 *nm_buf_idx = slot->buf_idx;
751 /* Advance to the next socket */
752 ctx->nm_i = nm_next(ctx->nm_i, ctx->lim);
753 slot = &ctx->slots[ctx->nm_i];
754 nm_info->sockets_used++;
760 ena_netmap_unmap_last_socket_chain(ctx, tx_info);
766 ena_netmap_unmap_last_socket_chain(struct ena_netmap_ctx *ctx,
767 struct ena_tx_buffer *tx_info)
769 struct ena_netmap_tx_info *nm_info;
772 nm_info = &tx_info->nm_info;
775 * As the used sockets must not be equal to the buffers used in the LLQ
776 * mode, they must be treated separately.
777 * First, unmap the DMA maps.
779 n = tx_info->num_of_bufs;
781 netmap_unload_map(ctx->na, ctx->adapter->tx_buf_tag,
782 nm_info->map_seg[n]);
784 tx_info->num_of_bufs = 0;
786 /* Next, retain the sockets back to the userspace */
787 n = nm_info->sockets_used;
789 ctx->slots[ctx->nm_i].buf_idx = nm_info->socket_buf_idx[n];
790 ctx->slots[ctx->nm_i].flags = NS_BUF_CHANGED;
791 nm_info->socket_buf_idx[n] = 0;
792 ctx->nm_i = nm_prev(ctx->nm_i, ctx->lim);
794 nm_info->sockets_used = 0;
798 ena_netmap_tx_cleanup(struct ena_netmap_ctx *ctx)
801 uint16_t total_tx_descs = 0;
803 ctx->nm_i = ctx->kring->nr_hwtail;
804 ctx->nt = ctx->ring->next_to_clean;
806 /* Reclaim buffers for completed transmissions */
807 while (ena_com_tx_comp_req_id_get(ctx->io_cq, &req_id) >= 0) {
808 if (validate_tx_req_id(ctx->ring, req_id) != 0)
810 total_tx_descs += ena_netmap_tx_clean_one(ctx, req_id);
813 ctx->kring->nr_hwtail = ctx->nm_i;
815 if (total_tx_descs > 0) {
816 /* acknowledge completion of sent packets */
817 ctx->ring->next_to_clean = ctx->nt;
818 ena_com_comp_ack(ctx->ring->ena_com_io_sq, total_tx_descs);
819 ena_com_update_dev_comp_head(ctx->ring->ena_com_io_cq);
824 ena_netmap_tx_clean_one(struct ena_netmap_ctx *ctx, uint16_t req_id)
826 struct ena_tx_buffer *tx_info;
827 struct ena_netmap_tx_info *nm_info;
830 tx_info = &ctx->ring->tx_buffer_info[req_id];
831 nm_info = &tx_info->nm_info;
834 * As the used sockets must not be equal to the buffers used in the LLQ
835 * mode, they must be treated separately.
836 * First, unmap the DMA maps.
838 n = tx_info->num_of_bufs;
839 for (n = 0; n < tx_info->num_of_bufs; n++) {
840 netmap_unload_map(ctx->na, ctx->adapter->tx_buf_tag,
841 nm_info->map_seg[n]);
843 tx_info->num_of_bufs = 0;
845 /* Next, retain the sockets back to the userspace */
846 for (n = 0; n < nm_info->sockets_used; n++) {
847 ctx->nm_i = nm_next(ctx->nm_i, ctx->lim);
848 ENA_WARN(ctx->slots[ctx->nm_i].buf_idx != 0,
849 ctx->adapter->ena_dev, "Tx idx is not 0.\n");
850 ctx->slots[ctx->nm_i].buf_idx = nm_info->socket_buf_idx[n];
851 ctx->slots[ctx->nm_i].flags = NS_BUF_CHANGED;
852 nm_info->socket_buf_idx[n] = 0;
854 nm_info->sockets_used = 0;
856 ctx->ring->free_tx_ids[ctx->nt] = req_id;
857 ctx->nt = ENA_TX_RING_IDX_NEXT(ctx->nt, ctx->lim);
859 return tx_info->tx_descs;
863 validate_tx_req_id(struct ena_ring *tx_ring, uint16_t req_id)
865 struct ena_adapter *adapter = tx_ring->adapter;
867 if (likely(req_id < tx_ring->ring_size))
870 ena_log_nm(adapter->pdev, WARN, "Invalid req_id %hu in qid %hu\n",
871 req_id, tx_ring->qid);
872 counter_u64_add(tx_ring->tx_stats.bad_req_id, 1);
874 ena_trigger_reset(adapter, ENA_REGS_RESET_INV_TX_REQ_ID);
880 ena_netmap_rxsync(struct netmap_kring *kring, int flags)
882 struct ena_netmap_ctx ctx;
885 ena_netmap_fill_ctx(kring, &ctx, ENA_IO_RXQ_IDX(kring->ring_id));
886 ctx.ring = &ctx.adapter->rx_ring[kring->ring_id];
888 if (ctx.kring->rhead > ctx.lim) {
889 /* Probably not needed to release slots from RX ring. */
890 return (netmap_ring_reinit(ctx.kring));
893 if (unlikely((if_getdrvflags(ctx.na->ifp) & IFF_DRV_RUNNING) == 0))
896 if (unlikely(!ENA_FLAG_ISSET(ENA_FLAG_LINK_UP, ctx.adapter)))
899 if ((rc = ena_netmap_rx_frames(&ctx)) != 0)
902 ena_netmap_rx_cleanup(&ctx);
908 ena_netmap_rx_frames(struct ena_netmap_ctx *ctx)
911 int frames_counter = 0;
913 ctx->nt = ctx->ring->next_to_clean;
914 ctx->nm_i = ctx->kring->nr_hwtail;
916 while ((rc = ena_netmap_rx_frame(ctx)) == ENA_NETMAP_MORE_FRAMES) {
918 /* In case of multiple frames, it is not an error. */
920 if (frames_counter > ENA_MAX_FRAMES) {
921 ena_log_nm(ctx->adapter->pdev, ERR,
922 "Driver is stuck in the Rx loop\n");
927 ctx->kring->nr_hwtail = ctx->nm_i;
928 ctx->kring->nr_kflags &= ~NKR_PENDINTR;
929 ctx->ring->next_to_clean = ctx->nt;
935 ena_netmap_rx_frame(struct ena_netmap_ctx *ctx)
937 struct ena_com_rx_ctx ena_rx_ctx;
938 enum ena_regs_reset_reason_types reset_reason;
942 ena_rx_ctx.ena_bufs = ctx->ring->ena_bufs;
943 ena_rx_ctx.max_bufs = ctx->adapter->max_rx_sgl_size;
944 bus_dmamap_sync(ctx->io_cq->cdesc_addr.mem_handle.tag,
945 ctx->io_cq->cdesc_addr.mem_handle.map, BUS_DMASYNC_POSTREAD);
947 rc = ena_com_rx_pkt(ctx->io_cq, ctx->io_sq, &ena_rx_ctx);
948 if (unlikely(rc != 0)) {
949 ena_log_nm(ctx->adapter->pdev, ERR,
950 "Failed to read pkt from the device with error: %d\n", rc);
951 if (rc == ENA_COM_NO_SPACE) {
952 counter_u64_add(ctx->ring->rx_stats.bad_desc_num, 1);
953 reset_reason = ENA_REGS_RESET_TOO_MANY_RX_DESCS;
955 counter_u64_add(ctx->ring->rx_stats.bad_req_id, 1);
956 reset_reason = ENA_REGS_RESET_INV_RX_REQ_ID;
958 ena_trigger_reset(ctx->adapter, reset_reason);
961 if (unlikely(ena_rx_ctx.descs == 0))
962 return (ENA_NETMAP_NO_MORE_FRAMES);
964 ena_log_nm(ctx->adapter->pdev, DBG,
965 "Rx: q %d got packet from ena. descs #:"
966 " %d l3 proto %d l4 proto %d hash: %x\n",
967 ctx->ring->qid, ena_rx_ctx.descs, ena_rx_ctx.l3_proto,
968 ena_rx_ctx.l4_proto, ena_rx_ctx.hash);
970 for (buf = 0; buf < ena_rx_ctx.descs; buf++)
971 if ((rc = ena_netmap_rx_load_desc(ctx, buf, &len)) != 0)
974 * ena_netmap_rx_load_desc doesn't know the number of descriptors.
975 * It just set flag NS_MOREFRAG to all slots, then here flag of
976 * last slot is cleared.
978 ctx->slots[nm_prev(ctx->nm_i, ctx->lim)].flags = NS_BUF_CHANGED;
984 bus_dmamap_sync(ctx->io_cq->cdesc_addr.mem_handle.tag,
985 ctx->io_cq->cdesc_addr.mem_handle.map, BUS_DMASYNC_PREREAD);
988 counter_u64_add_protected(ctx->ring->rx_stats.bytes, len);
989 counter_u64_add_protected(ctx->adapter->hw_stats.rx_bytes, len);
990 counter_u64_add_protected(ctx->ring->rx_stats.cnt, 1);
991 counter_u64_add_protected(ctx->adapter->hw_stats.rx_packets, 1);
994 return (ENA_NETMAP_MORE_FRAMES);
999 /* Remove failed packet from ring */
1001 ctx->slots[nm].flags = 0;
1002 ctx->slots[nm].len = 0;
1003 nm = nm_prev(nm, ctx->lim);
1010 ena_netmap_rx_load_desc(struct ena_netmap_ctx *ctx, uint16_t buf, int *len)
1012 struct ena_rx_buffer *rx_info;
1015 req_id = ctx->ring->ena_bufs[buf].req_id;
1016 rx_info = &ctx->ring->rx_buffer_info[req_id];
1017 bus_dmamap_sync(ctx->adapter->rx_buf_tag, rx_info->map,
1018 BUS_DMASYNC_POSTREAD);
1019 netmap_unload_map(ctx->na, ctx->adapter->rx_buf_tag, rx_info->map);
1021 ENA_WARN(ctx->slots[ctx->nm_i].buf_idx != 0, ctx->adapter->ena_dev,
1022 "Rx idx is not 0.\n");
1024 ctx->slots[ctx->nm_i].buf_idx = rx_info->netmap_buf_idx;
1025 rx_info->netmap_buf_idx = 0;
1027 * Set NS_MOREFRAG to all slots.
1028 * Then ena_netmap_rx_frame clears it from last one.
1030 ctx->slots[ctx->nm_i].flags |= NS_MOREFRAG | NS_BUF_CHANGED;
1031 ctx->slots[ctx->nm_i].len = ctx->ring->ena_bufs[buf].len;
1032 *len += ctx->slots[ctx->nm_i].len;
1033 ctx->ring->free_rx_ids[ctx->nt] = req_id;
1034 ena_log_nm(ctx->adapter->pdev, DBG,
1035 "rx_info %p, buf_idx %d, paddr %jx, nm: %d\n", rx_info,
1036 ctx->slots[ctx->nm_i].buf_idx, (uintmax_t)rx_info->ena_buf.paddr,
1039 ctx->nm_i = nm_next(ctx->nm_i, ctx->lim);
1040 ctx->nt = ENA_RX_RING_IDX_NEXT(ctx->nt, ctx->ring->ring_size);
1046 ena_netmap_rx_cleanup(struct ena_netmap_ctx *ctx)
1048 int refill_required;
1050 refill_required = ctx->kring->rhead - ctx->kring->nr_hwcur;
1051 if (ctx->kring->nr_hwcur != ctx->kring->nr_hwtail)
1052 refill_required -= 1;
1054 if (refill_required == 0)
1056 else if (refill_required < 0)
1057 refill_required += ctx->kring->nkr_num_slots;
1059 ena_refill_rx_bufs(ctx->ring, refill_required);
1063 ena_netmap_fill_ctx(struct netmap_kring *kring, struct ena_netmap_ctx *ctx,
1067 ctx->na = kring->na;
1068 ctx->adapter = if_getsoftc(ctx->na->ifp);
1069 ctx->lim = kring->nkr_num_slots - 1;
1070 ctx->io_cq = &ctx->adapter->ena_dev->io_cq_queues[ena_qid];
1071 ctx->io_sq = &ctx->adapter->ena_dev->io_sq_queues[ena_qid];
1072 ctx->slots = kring->ring->slot;
1076 ena_netmap_unload(struct ena_adapter *adapter, bus_dmamap_t map)
1078 struct netmap_adapter *na = NA(adapter->ifp);
1080 netmap_unload_map(na, adapter->tx_buf_tag, map);
1083 #endif /* DEV_NETMAP */