2 * Copyright (c) 2007 Mellanox Technologies. All rights reserved.
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 #include <net/busy_poll.h>
35 #include <linux/mlx4/cq.h>
36 #include <linux/slab.h>
37 #include <linux/mlx4/qp.h>
38 #include <linux/skbuff.h>
39 #include <linux/rculist.h>
40 #include <linux/if_ether.h>
41 #include <linux/if_vlan.h>
42 #include <linux/vmalloc.h>
43 #include <linux/irq.h>
45 #if IS_ENABLED(CONFIG_IPV6)
46 #include <net/ip6_checksum.h>
51 static int mlx4_alloc_pages(struct mlx4_en_priv
*priv
,
52 struct mlx4_en_rx_alloc
*page_alloc
,
53 const struct mlx4_en_frag_info
*frag_info
,
60 for (order
= MLX4_EN_ALLOC_PREFER_ORDER
; ;) {
64 gfp
|= __GFP_COMP
| __GFP_NOWARN
;
65 page
= alloc_pages(gfp
, order
);
69 ((PAGE_SIZE
<< order
) < frag_info
->frag_size
))
72 dma
= dma_map_page(priv
->ddev
, page
, 0, PAGE_SIZE
<< order
,
74 if (dma_mapping_error(priv
->ddev
, dma
)) {
78 page_alloc
->page_size
= PAGE_SIZE
<< order
;
79 page_alloc
->page
= page
;
80 page_alloc
->dma
= dma
;
81 page_alloc
->page_offset
= 0;
82 /* Not doing get_page() for each frag is a big win
83 * on asymetric workloads. Note we can not use atomic_set().
85 page_ref_add(page
, page_alloc
->page_size
/ frag_info
->frag_stride
- 1);
89 static int mlx4_en_alloc_frags(struct mlx4_en_priv
*priv
,
90 struct mlx4_en_rx_desc
*rx_desc
,
91 struct mlx4_en_rx_alloc
*frags
,
92 struct mlx4_en_rx_alloc
*ring_alloc
,
95 struct mlx4_en_rx_alloc page_alloc
[MLX4_EN_MAX_RX_FRAGS
];
96 const struct mlx4_en_frag_info
*frag_info
;
101 for (i
= 0; i
< priv
->num_frags
; i
++) {
102 frag_info
= &priv
->frag_info
[i
];
103 page_alloc
[i
] = ring_alloc
[i
];
104 page_alloc
[i
].page_offset
+= frag_info
->frag_stride
;
106 if (page_alloc
[i
].page_offset
+ frag_info
->frag_stride
<=
107 ring_alloc
[i
].page_size
)
110 if (mlx4_alloc_pages(priv
, &page_alloc
[i
], frag_info
, gfp
))
114 for (i
= 0; i
< priv
->num_frags
; i
++) {
115 frags
[i
] = ring_alloc
[i
];
116 dma
= ring_alloc
[i
].dma
+ ring_alloc
[i
].page_offset
;
117 ring_alloc
[i
] = page_alloc
[i
];
118 rx_desc
->data
[i
].addr
= cpu_to_be64(dma
);
125 if (page_alloc
[i
].page
!= ring_alloc
[i
].page
) {
126 dma_unmap_page(priv
->ddev
, page_alloc
[i
].dma
,
127 page_alloc
[i
].page_size
, PCI_DMA_FROMDEVICE
);
128 page
= page_alloc
[i
].page
;
129 set_page_count(page
, 1);
136 static void mlx4_en_free_frag(struct mlx4_en_priv
*priv
,
137 struct mlx4_en_rx_alloc
*frags
,
140 const struct mlx4_en_frag_info
*frag_info
= &priv
->frag_info
[i
];
141 u32 next_frag_end
= frags
[i
].page_offset
+ 2 * frag_info
->frag_stride
;
144 if (next_frag_end
> frags
[i
].page_size
)
145 dma_unmap_page(priv
->ddev
, frags
[i
].dma
, frags
[i
].page_size
,
149 put_page(frags
[i
].page
);
152 static int mlx4_en_init_allocator(struct mlx4_en_priv
*priv
,
153 struct mlx4_en_rx_ring
*ring
)
156 struct mlx4_en_rx_alloc
*page_alloc
;
158 for (i
= 0; i
< priv
->num_frags
; i
++) {
159 const struct mlx4_en_frag_info
*frag_info
= &priv
->frag_info
[i
];
161 if (mlx4_alloc_pages(priv
, &ring
->page_alloc
[i
],
162 frag_info
, GFP_KERNEL
| __GFP_COLD
))
165 en_dbg(DRV
, priv
, " frag %d allocator: - size:%d frags:%d\n",
166 i
, ring
->page_alloc
[i
].page_size
,
167 page_ref_count(ring
->page_alloc
[i
].page
));
175 page_alloc
= &ring
->page_alloc
[i
];
176 dma_unmap_page(priv
->ddev
, page_alloc
->dma
,
177 page_alloc
->page_size
, PCI_DMA_FROMDEVICE
);
178 page
= page_alloc
->page
;
179 set_page_count(page
, 1);
181 page_alloc
->page
= NULL
;
186 static void mlx4_en_destroy_allocator(struct mlx4_en_priv
*priv
,
187 struct mlx4_en_rx_ring
*ring
)
189 struct mlx4_en_rx_alloc
*page_alloc
;
192 for (i
= 0; i
< priv
->num_frags
; i
++) {
193 const struct mlx4_en_frag_info
*frag_info
= &priv
->frag_info
[i
];
195 page_alloc
= &ring
->page_alloc
[i
];
196 en_dbg(DRV
, priv
, "Freeing allocator:%d count:%d\n",
197 i
, page_count(page_alloc
->page
));
199 dma_unmap_page(priv
->ddev
, page_alloc
->dma
,
200 page_alloc
->page_size
, PCI_DMA_FROMDEVICE
);
201 while (page_alloc
->page_offset
+ frag_info
->frag_stride
<
202 page_alloc
->page_size
) {
203 put_page(page_alloc
->page
);
204 page_alloc
->page_offset
+= frag_info
->frag_stride
;
206 page_alloc
->page
= NULL
;
210 static void mlx4_en_init_rx_desc(struct mlx4_en_priv
*priv
,
211 struct mlx4_en_rx_ring
*ring
, int index
)
213 struct mlx4_en_rx_desc
*rx_desc
= ring
->buf
+ ring
->stride
* index
;
217 /* Set size and memtype fields */
218 for (i
= 0; i
< priv
->num_frags
; i
++) {
219 rx_desc
->data
[i
].byte_count
=
220 cpu_to_be32(priv
->frag_info
[i
].frag_size
);
221 rx_desc
->data
[i
].lkey
= cpu_to_be32(priv
->mdev
->mr
.key
);
224 /* If the number of used fragments does not fill up the ring stride,
225 * remaining (unused) fragments must be padded with null address/size
226 * and a special memory key */
227 possible_frags
= (ring
->stride
- sizeof(struct mlx4_en_rx_desc
)) / DS_SIZE
;
228 for (i
= priv
->num_frags
; i
< possible_frags
; i
++) {
229 rx_desc
->data
[i
].byte_count
= 0;
230 rx_desc
->data
[i
].lkey
= cpu_to_be32(MLX4_EN_MEMTYPE_PAD
);
231 rx_desc
->data
[i
].addr
= 0;
235 static int mlx4_en_prepare_rx_desc(struct mlx4_en_priv
*priv
,
236 struct mlx4_en_rx_ring
*ring
, int index
,
239 struct mlx4_en_rx_desc
*rx_desc
= ring
->buf
+ (index
* ring
->stride
);
240 struct mlx4_en_rx_alloc
*frags
= ring
->rx_info
+
241 (index
<< priv
->log_rx_info
);
243 return mlx4_en_alloc_frags(priv
, rx_desc
, frags
, ring
->page_alloc
, gfp
);
246 static inline bool mlx4_en_is_ring_empty(struct mlx4_en_rx_ring
*ring
)
248 return ring
->prod
== ring
->cons
;
251 static inline void mlx4_en_update_rx_prod_db(struct mlx4_en_rx_ring
*ring
)
253 *ring
->wqres
.db
.db
= cpu_to_be32(ring
->prod
& 0xffff);
256 static void mlx4_en_free_rx_desc(struct mlx4_en_priv
*priv
,
257 struct mlx4_en_rx_ring
*ring
,
260 struct mlx4_en_rx_alloc
*frags
;
263 frags
= ring
->rx_info
+ (index
<< priv
->log_rx_info
);
264 for (nr
= 0; nr
< priv
->num_frags
; nr
++) {
265 en_dbg(DRV
, priv
, "Freeing fragment:%d\n", nr
);
266 mlx4_en_free_frag(priv
, frags
, nr
);
270 static int mlx4_en_fill_rx_buffers(struct mlx4_en_priv
*priv
)
272 struct mlx4_en_rx_ring
*ring
;
277 for (buf_ind
= 0; buf_ind
< priv
->prof
->rx_ring_size
; buf_ind
++) {
278 for (ring_ind
= 0; ring_ind
< priv
->rx_ring_num
; ring_ind
++) {
279 ring
= priv
->rx_ring
[ring_ind
];
281 if (mlx4_en_prepare_rx_desc(priv
, ring
,
283 GFP_KERNEL
| __GFP_COLD
)) {
284 if (ring
->actual_size
< MLX4_EN_MIN_RX_SIZE
) {
285 en_err(priv
, "Failed to allocate enough rx buffers\n");
288 new_size
= rounddown_pow_of_two(ring
->actual_size
);
289 en_warn(priv
, "Only %d buffers allocated reducing ring size to %d\n",
290 ring
->actual_size
, new_size
);
301 for (ring_ind
= 0; ring_ind
< priv
->rx_ring_num
; ring_ind
++) {
302 ring
= priv
->rx_ring
[ring_ind
];
303 while (ring
->actual_size
> new_size
) {
306 mlx4_en_free_rx_desc(priv
, ring
, ring
->actual_size
);
313 static void mlx4_en_free_rx_buf(struct mlx4_en_priv
*priv
,
314 struct mlx4_en_rx_ring
*ring
)
318 en_dbg(DRV
, priv
, "Freeing Rx buf - cons:%d prod:%d\n",
319 ring
->cons
, ring
->prod
);
321 /* Unmap and free Rx buffers */
322 while (!mlx4_en_is_ring_empty(ring
)) {
323 index
= ring
->cons
& ring
->size_mask
;
324 en_dbg(DRV
, priv
, "Processing descriptor:%d\n", index
);
325 mlx4_en_free_rx_desc(priv
, ring
, index
);
330 void mlx4_en_set_num_rx_rings(struct mlx4_en_dev
*mdev
)
335 struct mlx4_dev
*dev
= mdev
->dev
;
337 mlx4_foreach_port(i
, dev
, MLX4_PORT_TYPE_ETH
) {
338 num_of_eqs
= max_t(int, MIN_RX_RINGS
,
340 mlx4_get_eqs_per_port(mdev
->dev
, i
),
343 num_rx_rings
= mlx4_low_memory_profile() ? MIN_RX_RINGS
:
344 min_t(int, num_of_eqs
,
345 netif_get_num_default_rss_queues());
346 mdev
->profile
.prof
[i
].rx_ring_num
=
347 rounddown_pow_of_two(num_rx_rings
);
351 int mlx4_en_create_rx_ring(struct mlx4_en_priv
*priv
,
352 struct mlx4_en_rx_ring
**pring
,
353 u32 size
, u16 stride
, int node
)
355 struct mlx4_en_dev
*mdev
= priv
->mdev
;
356 struct mlx4_en_rx_ring
*ring
;
360 ring
= kzalloc_node(sizeof(*ring
), GFP_KERNEL
, node
);
362 ring
= kzalloc(sizeof(*ring
), GFP_KERNEL
);
364 en_err(priv
, "Failed to allocate RX ring structure\n");
372 ring
->size_mask
= size
- 1;
373 ring
->stride
= stride
;
374 ring
->log_stride
= ffs(ring
->stride
) - 1;
375 ring
->buf_size
= ring
->size
* ring
->stride
+ TXBB_SIZE
;
377 tmp
= size
* roundup_pow_of_two(MLX4_EN_MAX_RX_FRAGS
*
378 sizeof(struct mlx4_en_rx_alloc
));
379 ring
->rx_info
= vmalloc_node(tmp
, node
);
380 if (!ring
->rx_info
) {
381 ring
->rx_info
= vmalloc(tmp
);
382 if (!ring
->rx_info
) {
388 en_dbg(DRV
, priv
, "Allocated rx_info ring at addr:%p size:%d\n",
391 /* Allocate HW buffers on provided NUMA node */
392 set_dev_node(&mdev
->dev
->persist
->pdev
->dev
, node
);
393 err
= mlx4_alloc_hwq_res(mdev
->dev
, &ring
->wqres
,
394 ring
->buf_size
, 2 * PAGE_SIZE
);
395 set_dev_node(&mdev
->dev
->persist
->pdev
->dev
, mdev
->dev
->numa_node
);
399 err
= mlx4_en_map_buffer(&ring
->wqres
.buf
);
401 en_err(priv
, "Failed to map RX buffer\n");
404 ring
->buf
= ring
->wqres
.buf
.direct
.buf
;
406 ring
->hwtstamp_rx_filter
= priv
->hwtstamp_config
.rx_filter
;
412 mlx4_free_hwq_res(mdev
->dev
, &ring
->wqres
, ring
->buf_size
);
414 vfree(ring
->rx_info
);
415 ring
->rx_info
= NULL
;
423 int mlx4_en_activate_rx_rings(struct mlx4_en_priv
*priv
)
425 struct mlx4_en_rx_ring
*ring
;
429 int stride
= roundup_pow_of_two(sizeof(struct mlx4_en_rx_desc
) +
430 DS_SIZE
* priv
->num_frags
);
432 for (ring_ind
= 0; ring_ind
< priv
->rx_ring_num
; ring_ind
++) {
433 ring
= priv
->rx_ring
[ring_ind
];
437 ring
->actual_size
= 0;
438 ring
->cqn
= priv
->rx_cq
[ring_ind
]->mcq
.cqn
;
440 ring
->stride
= stride
;
441 if (ring
->stride
<= TXBB_SIZE
)
442 ring
->buf
+= TXBB_SIZE
;
444 ring
->log_stride
= ffs(ring
->stride
) - 1;
445 ring
->buf_size
= ring
->size
* ring
->stride
;
447 memset(ring
->buf
, 0, ring
->buf_size
);
448 mlx4_en_update_rx_prod_db(ring
);
450 /* Initialize all descriptors */
451 for (i
= 0; i
< ring
->size
; i
++)
452 mlx4_en_init_rx_desc(priv
, ring
, i
);
454 /* Initialize page allocators */
455 err
= mlx4_en_init_allocator(priv
, ring
);
457 en_err(priv
, "Failed initializing ring allocator\n");
458 if (ring
->stride
<= TXBB_SIZE
)
459 ring
->buf
-= TXBB_SIZE
;
464 err
= mlx4_en_fill_rx_buffers(priv
);
468 for (ring_ind
= 0; ring_ind
< priv
->rx_ring_num
; ring_ind
++) {
469 ring
= priv
->rx_ring
[ring_ind
];
471 ring
->size_mask
= ring
->actual_size
- 1;
472 mlx4_en_update_rx_prod_db(ring
);
478 for (ring_ind
= 0; ring_ind
< priv
->rx_ring_num
; ring_ind
++)
479 mlx4_en_free_rx_buf(priv
, priv
->rx_ring
[ring_ind
]);
481 ring_ind
= priv
->rx_ring_num
- 1;
483 while (ring_ind
>= 0) {
484 if (priv
->rx_ring
[ring_ind
]->stride
<= TXBB_SIZE
)
485 priv
->rx_ring
[ring_ind
]->buf
-= TXBB_SIZE
;
486 mlx4_en_destroy_allocator(priv
, priv
->rx_ring
[ring_ind
]);
492 /* We recover from out of memory by scheduling our napi poll
493 * function (mlx4_en_process_cq), which tries to allocate
494 * all missing RX buffers (call to mlx4_en_refill_rx_buffers).
496 void mlx4_en_recover_from_oom(struct mlx4_en_priv
*priv
)
503 for (ring
= 0; ring
< priv
->rx_ring_num
; ring
++) {
504 if (mlx4_en_is_ring_empty(priv
->rx_ring
[ring
]))
505 napi_reschedule(&priv
->rx_cq
[ring
]->napi
);
509 void mlx4_en_destroy_rx_ring(struct mlx4_en_priv
*priv
,
510 struct mlx4_en_rx_ring
**pring
,
511 u32 size
, u16 stride
)
513 struct mlx4_en_dev
*mdev
= priv
->mdev
;
514 struct mlx4_en_rx_ring
*ring
= *pring
;
516 mlx4_en_unmap_buffer(&ring
->wqres
.buf
);
517 mlx4_free_hwq_res(mdev
->dev
, &ring
->wqres
, size
* stride
+ TXBB_SIZE
);
518 vfree(ring
->rx_info
);
519 ring
->rx_info
= NULL
;
522 #ifdef CONFIG_RFS_ACCEL
523 mlx4_en_cleanup_filters(priv
);
527 void mlx4_en_deactivate_rx_ring(struct mlx4_en_priv
*priv
,
528 struct mlx4_en_rx_ring
*ring
)
530 mlx4_en_free_rx_buf(priv
, ring
);
531 if (ring
->stride
<= TXBB_SIZE
)
532 ring
->buf
-= TXBB_SIZE
;
533 mlx4_en_destroy_allocator(priv
, ring
);
537 static int mlx4_en_complete_rx_desc(struct mlx4_en_priv
*priv
,
538 struct mlx4_en_rx_desc
*rx_desc
,
539 struct mlx4_en_rx_alloc
*frags
,
543 struct skb_frag_struct
*skb_frags_rx
= skb_shinfo(skb
)->frags
;
544 struct mlx4_en_frag_info
*frag_info
;
548 /* Collect used fragments while replacing them in the HW descriptors */
549 for (nr
= 0; nr
< priv
->num_frags
; nr
++) {
550 frag_info
= &priv
->frag_info
[nr
];
551 if (length
<= frag_info
->frag_prefix_size
)
556 dma
= be64_to_cpu(rx_desc
->data
[nr
].addr
);
557 dma_sync_single_for_cpu(priv
->ddev
, dma
, frag_info
->frag_size
,
560 /* Save page reference in skb */
561 __skb_frag_set_page(&skb_frags_rx
[nr
], frags
[nr
].page
);
562 skb_frag_size_set(&skb_frags_rx
[nr
], frag_info
->frag_size
);
563 skb_frags_rx
[nr
].page_offset
= frags
[nr
].page_offset
;
564 skb
->truesize
+= frag_info
->frag_stride
;
565 frags
[nr
].page
= NULL
;
567 /* Adjust size of last fragment to match actual length */
569 skb_frag_size_set(&skb_frags_rx
[nr
- 1],
570 length
- priv
->frag_info
[nr
- 1].frag_prefix_size
);
576 __skb_frag_unref(&skb_frags_rx
[nr
]);
582 static struct sk_buff
*mlx4_en_rx_skb(struct mlx4_en_priv
*priv
,
583 struct mlx4_en_rx_desc
*rx_desc
,
584 struct mlx4_en_rx_alloc
*frags
,
592 skb
= netdev_alloc_skb(priv
->dev
, SMALL_PACKET_SIZE
+ NET_IP_ALIGN
);
594 en_dbg(RX_ERR
, priv
, "Failed allocating skb\n");
597 skb_reserve(skb
, NET_IP_ALIGN
);
600 /* Get pointer to first fragment so we could copy the headers into the
601 * (linear part of the) skb */
602 va
= page_address(frags
[0].page
) + frags
[0].page_offset
;
604 if (length
<= SMALL_PACKET_SIZE
) {
605 /* We are copying all relevant data to the skb - temporarily
606 * sync buffers for the copy */
607 dma
= be64_to_cpu(rx_desc
->data
[0].addr
);
608 dma_sync_single_for_cpu(priv
->ddev
, dma
, length
,
610 skb_copy_to_linear_data(skb
, va
, length
);
613 unsigned int pull_len
;
615 /* Move relevant fragments to skb */
616 used_frags
= mlx4_en_complete_rx_desc(priv
, rx_desc
, frags
,
618 if (unlikely(!used_frags
)) {
622 skb_shinfo(skb
)->nr_frags
= used_frags
;
624 pull_len
= eth_get_headlen(va
, SMALL_PACKET_SIZE
);
625 /* Copy headers into the skb linear buffer */
626 memcpy(skb
->data
, va
, pull_len
);
627 skb
->tail
+= pull_len
;
629 /* Skip headers in first fragment */
630 skb_shinfo(skb
)->frags
[0].page_offset
+= pull_len
;
632 /* Adjust size of first fragment */
633 skb_frag_size_sub(&skb_shinfo(skb
)->frags
[0], pull_len
);
634 skb
->data_len
= length
- pull_len
;
639 static void validate_loopback(struct mlx4_en_priv
*priv
, struct sk_buff
*skb
)
642 int offset
= ETH_HLEN
;
644 for (i
= 0; i
< MLX4_LOOPBACK_TEST_PAYLOAD
; i
++, offset
++) {
645 if (*(skb
->data
+ offset
) != (unsigned char) (i
& 0xff))
649 priv
->loopback_ok
= 1;
652 dev_kfree_skb_any(skb
);
655 static void mlx4_en_refill_rx_buffers(struct mlx4_en_priv
*priv
,
656 struct mlx4_en_rx_ring
*ring
)
658 int index
= ring
->prod
& ring
->size_mask
;
660 while ((u32
) (ring
->prod
- ring
->cons
) < ring
->actual_size
) {
661 if (mlx4_en_prepare_rx_desc(priv
, ring
, index
,
662 GFP_ATOMIC
| __GFP_COLD
))
665 index
= ring
->prod
& ring
->size_mask
;
669 /* When hardware doesn't strip the vlan, we need to calculate the checksum
670 * over it and add it to the hardware's checksum calculation
672 static inline __wsum
get_fixed_vlan_csum(__wsum hw_checksum
,
673 struct vlan_hdr
*vlanh
)
675 return csum_add(hw_checksum
, *(__wsum
*)vlanh
);
678 /* Although the stack expects checksum which doesn't include the pseudo
679 * header, the HW adds it. To address that, we are subtracting the pseudo
680 * header checksum from the checksum value provided by the HW.
682 static void get_fixed_ipv4_csum(__wsum hw_checksum
, struct sk_buff
*skb
,
685 __u16 length_for_csum
= 0;
686 __wsum csum_pseudo_header
= 0;
688 length_for_csum
= (be16_to_cpu(iph
->tot_len
) - (iph
->ihl
<< 2));
689 csum_pseudo_header
= csum_tcpudp_nofold(iph
->saddr
, iph
->daddr
,
690 length_for_csum
, iph
->protocol
, 0);
691 skb
->csum
= csum_sub(hw_checksum
, csum_pseudo_header
);
694 #if IS_ENABLED(CONFIG_IPV6)
695 /* In IPv6 packets, besides subtracting the pseudo header checksum,
696 * we also compute/add the IP header checksum which
697 * is not added by the HW.
699 static int get_fixed_ipv6_csum(__wsum hw_checksum
, struct sk_buff
*skb
,
700 struct ipv6hdr
*ipv6h
)
702 __wsum csum_pseudo_hdr
= 0;
704 if (ipv6h
->nexthdr
== IPPROTO_FRAGMENT
|| ipv6h
->nexthdr
== IPPROTO_HOPOPTS
)
706 hw_checksum
= csum_add(hw_checksum
, (__force __wsum
)(ipv6h
->nexthdr
<< 8));
708 csum_pseudo_hdr
= csum_partial(&ipv6h
->saddr
,
709 sizeof(ipv6h
->saddr
) + sizeof(ipv6h
->daddr
), 0);
710 csum_pseudo_hdr
= csum_add(csum_pseudo_hdr
, (__force __wsum
)ipv6h
->payload_len
);
711 csum_pseudo_hdr
= csum_add(csum_pseudo_hdr
, (__force __wsum
)ntohs(ipv6h
->nexthdr
));
713 skb
->csum
= csum_sub(hw_checksum
, csum_pseudo_hdr
);
714 skb
->csum
= csum_add(skb
->csum
, csum_partial(ipv6h
, sizeof(struct ipv6hdr
), 0));
718 static int check_csum(struct mlx4_cqe
*cqe
, struct sk_buff
*skb
, void *va
,
719 netdev_features_t dev_features
)
721 __wsum hw_checksum
= 0;
723 void *hdr
= (u8
*)va
+ sizeof(struct ethhdr
);
725 hw_checksum
= csum_unfold((__force __sum16
)cqe
->checksum
);
727 if (cqe
->vlan_my_qpn
& cpu_to_be32(MLX4_CQE_CVLAN_PRESENT_MASK
) &&
728 !(dev_features
& NETIF_F_HW_VLAN_CTAG_RX
)) {
729 hw_checksum
= get_fixed_vlan_csum(hw_checksum
, hdr
);
730 hdr
+= sizeof(struct vlan_hdr
);
733 if (cqe
->status
& cpu_to_be16(MLX4_CQE_STATUS_IPV4
))
734 get_fixed_ipv4_csum(hw_checksum
, skb
, hdr
);
735 #if IS_ENABLED(CONFIG_IPV6)
736 else if (cqe
->status
& cpu_to_be16(MLX4_CQE_STATUS_IPV6
))
737 if (get_fixed_ipv6_csum(hw_checksum
, skb
, hdr
))
743 int mlx4_en_process_rx_cq(struct net_device
*dev
, struct mlx4_en_cq
*cq
, int budget
)
745 struct mlx4_en_priv
*priv
= netdev_priv(dev
);
746 struct mlx4_en_dev
*mdev
= priv
->mdev
;
747 struct mlx4_cqe
*cqe
;
748 struct mlx4_en_rx_ring
*ring
= priv
->rx_ring
[cq
->ring
];
749 struct mlx4_en_rx_alloc
*frags
;
750 struct mlx4_en_rx_desc
*rx_desc
;
757 int factor
= priv
->cqe_factor
;
767 /* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx
768 * descriptor offset can be deduced from the CQE index instead of
769 * reading 'cqe->index' */
770 index
= cq
->mcq
.cons_index
& ring
->size_mask
;
771 cqe
= mlx4_en_get_cqe(cq
->buf
, index
, priv
->cqe_size
) + factor
;
773 /* Process all completed CQEs */
774 while (XNOR(cqe
->owner_sr_opcode
& MLX4_CQE_OWNER_MASK
,
775 cq
->mcq
.cons_index
& cq
->size
)) {
777 frags
= ring
->rx_info
+ (index
<< priv
->log_rx_info
);
778 rx_desc
= ring
->buf
+ (index
<< ring
->log_stride
);
781 * make sure we read the CQE after we read the ownership bit
785 /* Drop packet on bad receive or bad checksum */
786 if (unlikely((cqe
->owner_sr_opcode
& MLX4_CQE_OPCODE_MASK
) ==
787 MLX4_CQE_OPCODE_ERROR
)) {
788 en_err(priv
, "CQE completed in error - vendor syndrom:%d syndrom:%d\n",
789 ((struct mlx4_err_cqe
*)cqe
)->vendor_err_syndrome
,
790 ((struct mlx4_err_cqe
*)cqe
)->syndrome
);
793 if (unlikely(cqe
->badfcs_enc
& MLX4_CQE_BAD_FCS
)) {
794 en_dbg(RX_ERR
, priv
, "Accepted frame with bad FCS\n");
798 /* Check if we need to drop the packet if SRIOV is not enabled
799 * and not performing the selftest or flb disabled
801 if (priv
->flags
& MLX4_EN_FLAG_RX_FILTER_NEEDED
) {
804 /* Get pointer to first fragment since we haven't
805 * skb yet and cast it to ethhdr struct
807 dma
= be64_to_cpu(rx_desc
->data
[0].addr
);
808 dma_sync_single_for_cpu(priv
->ddev
, dma
, sizeof(*ethh
),
810 ethh
= (struct ethhdr
*)(page_address(frags
[0].page
) +
811 frags
[0].page_offset
);
813 if (is_multicast_ether_addr(ethh
->h_dest
)) {
814 struct mlx4_mac_entry
*entry
;
815 struct hlist_head
*bucket
;
816 unsigned int mac_hash
;
818 /* Drop the packet, since HW loopback-ed it */
819 mac_hash
= ethh
->h_source
[MLX4_EN_MAC_HASH_IDX
];
820 bucket
= &priv
->mac_hash
[mac_hash
];
822 hlist_for_each_entry_rcu(entry
, bucket
, hlist
) {
823 if (ether_addr_equal_64bits(entry
->mac
,
834 * Packet is OK - process it.
836 length
= be32_to_cpu(cqe
->byte_cnt
);
837 length
-= ring
->fcs_del
;
838 ring
->bytes
+= length
;
840 l2_tunnel
= (dev
->hw_enc_features
& NETIF_F_RXCSUM
) &&
841 (cqe
->vlan_my_qpn
& cpu_to_be32(MLX4_CQE_L2_TUNNEL
));
843 if (likely(dev
->features
& NETIF_F_RXCSUM
)) {
844 if (cqe
->status
& cpu_to_be16(MLX4_CQE_STATUS_TCP
|
845 MLX4_CQE_STATUS_UDP
)) {
846 if ((cqe
->status
& cpu_to_be16(MLX4_CQE_STATUS_IPOK
)) &&
847 cqe
->checksum
== cpu_to_be16(0xffff)) {
848 ip_summed
= CHECKSUM_UNNECESSARY
;
851 ip_summed
= CHECKSUM_NONE
;
855 if (priv
->flags
& MLX4_EN_FLAG_RX_CSUM_NON_TCP_UDP
&&
856 (cqe
->status
& cpu_to_be16(MLX4_CQE_STATUS_IPV4
|
857 MLX4_CQE_STATUS_IPV6
))) {
858 ip_summed
= CHECKSUM_COMPLETE
;
859 ring
->csum_complete
++;
861 ip_summed
= CHECKSUM_NONE
;
866 ip_summed
= CHECKSUM_NONE
;
870 /* This packet is eligible for GRO if it is:
871 * - DIX Ethernet (type interpretation)
873 * - without IP options
874 * - not an IP fragment
876 if (dev
->features
& NETIF_F_GRO
) {
877 struct sk_buff
*gro_skb
= napi_get_frags(&cq
->napi
);
881 nr
= mlx4_en_complete_rx_desc(priv
,
882 rx_desc
, frags
, gro_skb
,
887 if (ip_summed
== CHECKSUM_COMPLETE
) {
888 void *va
= skb_frag_address(skb_shinfo(gro_skb
)->frags
);
889 if (check_csum(cqe
, gro_skb
, va
,
891 ip_summed
= CHECKSUM_NONE
;
893 ring
->csum_complete
--;
897 skb_shinfo(gro_skb
)->nr_frags
= nr
;
898 gro_skb
->len
= length
;
899 gro_skb
->data_len
= length
;
900 gro_skb
->ip_summed
= ip_summed
;
902 if (l2_tunnel
&& ip_summed
== CHECKSUM_UNNECESSARY
)
903 gro_skb
->csum_level
= 1;
905 if ((cqe
->vlan_my_qpn
&
906 cpu_to_be32(MLX4_CQE_CVLAN_PRESENT_MASK
)) &&
907 (dev
->features
& NETIF_F_HW_VLAN_CTAG_RX
)) {
908 u16 vid
= be16_to_cpu(cqe
->sl_vid
);
910 __vlan_hwaccel_put_tag(gro_skb
, htons(ETH_P_8021Q
), vid
);
911 } else if ((be32_to_cpu(cqe
->vlan_my_qpn
) &
912 MLX4_CQE_SVLAN_PRESENT_MASK
) &&
913 (dev
->features
& NETIF_F_HW_VLAN_STAG_RX
)) {
914 __vlan_hwaccel_put_tag(gro_skb
,
916 be16_to_cpu(cqe
->sl_vid
));
919 if (dev
->features
& NETIF_F_RXHASH
)
920 skb_set_hash(gro_skb
,
921 be32_to_cpu(cqe
->immed_rss_invalid
),
922 (ip_summed
== CHECKSUM_UNNECESSARY
) ?
926 skb_record_rx_queue(gro_skb
, cq
->ring
);
928 if (ring
->hwtstamp_rx_filter
== HWTSTAMP_FILTER_ALL
) {
929 timestamp
= mlx4_en_get_cqe_ts(cqe
);
930 mlx4_en_fill_hwtstamps(mdev
,
931 skb_hwtstamps(gro_skb
),
935 napi_gro_frags(&cq
->napi
);
939 /* GRO not possible, complete processing here */
940 skb
= mlx4_en_rx_skb(priv
, rx_desc
, frags
, length
);
942 priv
->stats
.rx_dropped
++;
946 if (unlikely(priv
->validate_loopback
)) {
947 validate_loopback(priv
, skb
);
951 if (ip_summed
== CHECKSUM_COMPLETE
) {
952 if (check_csum(cqe
, skb
, skb
->data
, dev
->features
)) {
953 ip_summed
= CHECKSUM_NONE
;
954 ring
->csum_complete
--;
959 skb
->ip_summed
= ip_summed
;
960 skb
->protocol
= eth_type_trans(skb
, dev
);
961 skb_record_rx_queue(skb
, cq
->ring
);
963 if (l2_tunnel
&& ip_summed
== CHECKSUM_UNNECESSARY
)
966 if (dev
->features
& NETIF_F_RXHASH
)
968 be32_to_cpu(cqe
->immed_rss_invalid
),
969 (ip_summed
== CHECKSUM_UNNECESSARY
) ?
973 if ((be32_to_cpu(cqe
->vlan_my_qpn
) &
974 MLX4_CQE_CVLAN_PRESENT_MASK
) &&
975 (dev
->features
& NETIF_F_HW_VLAN_CTAG_RX
))
976 __vlan_hwaccel_put_tag(skb
, htons(ETH_P_8021Q
), be16_to_cpu(cqe
->sl_vid
));
977 else if ((be32_to_cpu(cqe
->vlan_my_qpn
) &
978 MLX4_CQE_SVLAN_PRESENT_MASK
) &&
979 (dev
->features
& NETIF_F_HW_VLAN_STAG_RX
))
980 __vlan_hwaccel_put_tag(skb
, htons(ETH_P_8021AD
),
981 be16_to_cpu(cqe
->sl_vid
));
983 if (ring
->hwtstamp_rx_filter
== HWTSTAMP_FILTER_ALL
) {
984 timestamp
= mlx4_en_get_cqe_ts(cqe
);
985 mlx4_en_fill_hwtstamps(mdev
, skb_hwtstamps(skb
),
989 napi_gro_receive(&cq
->napi
, skb
);
991 for (nr
= 0; nr
< priv
->num_frags
; nr
++)
992 mlx4_en_free_frag(priv
, frags
, nr
);
994 ++cq
->mcq
.cons_index
;
995 index
= (cq
->mcq
.cons_index
) & ring
->size_mask
;
996 cqe
= mlx4_en_get_cqe(cq
->buf
, index
, priv
->cqe_size
) + factor
;
997 if (++polled
== budget
)
1002 AVG_PERF_COUNTER(priv
->pstats
.rx_coal_avg
, polled
);
1003 mlx4_cq_set_ci(&cq
->mcq
);
1004 wmb(); /* ensure HW sees CQ consumer before we post new buffers */
1005 ring
->cons
= cq
->mcq
.cons_index
;
1006 mlx4_en_refill_rx_buffers(priv
, ring
);
1007 mlx4_en_update_rx_prod_db(ring
);
1012 void mlx4_en_rx_irq(struct mlx4_cq
*mcq
)
1014 struct mlx4_en_cq
*cq
= container_of(mcq
, struct mlx4_en_cq
, mcq
);
1015 struct mlx4_en_priv
*priv
= netdev_priv(cq
->dev
);
1017 if (likely(priv
->port_up
))
1018 napi_schedule_irqoff(&cq
->napi
);
1020 mlx4_en_arm_cq(priv
, cq
);
1023 /* Rx CQ polling - called by NAPI */
1024 int mlx4_en_poll_rx_cq(struct napi_struct
*napi
, int budget
)
1026 struct mlx4_en_cq
*cq
= container_of(napi
, struct mlx4_en_cq
, napi
);
1027 struct net_device
*dev
= cq
->dev
;
1028 struct mlx4_en_priv
*priv
= netdev_priv(dev
);
1031 done
= mlx4_en_process_rx_cq(dev
, cq
, budget
);
1033 /* If we used up all the quota - we're probably not done yet... */
1034 if (done
== budget
) {
1035 const struct cpumask
*aff
;
1036 struct irq_data
*idata
;
1039 INC_PERF_COUNTER(priv
->pstats
.napi_quota
);
1041 cpu_curr
= smp_processor_id();
1042 idata
= irq_desc_get_irq_data(cq
->irq_desc
);
1043 aff
= irq_data_get_affinity_mask(idata
);
1045 if (likely(cpumask_test_cpu(cpu_curr
, aff
)))
1048 /* Current cpu is not according to smp_irq_affinity -
1049 * probably affinity changed. need to stop this NAPI
1050 * poll, and restart it on the right CPU
1055 napi_complete_done(napi
, done
);
1056 mlx4_en_arm_cq(priv
, cq
);
1060 static const int frag_sizes
[] = {
1067 void mlx4_en_calc_rx_buf(struct net_device
*dev
)
1069 struct mlx4_en_priv
*priv
= netdev_priv(dev
);
1070 /* VLAN_HLEN is added twice,to support skb vlan tagged with multiple
1071 * headers. (For example: ETH_P_8021Q and ETH_P_8021AD).
1073 int eff_mtu
= dev
->mtu
+ ETH_HLEN
+ (2 * VLAN_HLEN
);
1077 while (buf_size
< eff_mtu
) {
1078 priv
->frag_info
[i
].frag_size
=
1079 (eff_mtu
> buf_size
+ frag_sizes
[i
]) ?
1080 frag_sizes
[i
] : eff_mtu
- buf_size
;
1081 priv
->frag_info
[i
].frag_prefix_size
= buf_size
;
1082 priv
->frag_info
[i
].frag_stride
=
1083 ALIGN(priv
->frag_info
[i
].frag_size
,
1085 buf_size
+= priv
->frag_info
[i
].frag_size
;
1089 priv
->num_frags
= i
;
1090 priv
->rx_skb_size
= eff_mtu
;
1091 priv
->log_rx_info
= ROUNDUP_LOG2(i
* sizeof(struct mlx4_en_rx_alloc
));
1093 en_dbg(DRV
, priv
, "Rx buffer scatter-list (effective-mtu:%d num_frags:%d):\n",
1094 eff_mtu
, priv
->num_frags
);
1095 for (i
= 0; i
< priv
->num_frags
; i
++) {
1097 " frag:%d - size:%d prefix:%d stride:%d\n",
1099 priv
->frag_info
[i
].frag_size
,
1100 priv
->frag_info
[i
].frag_prefix_size
,
1101 priv
->frag_info
[i
].frag_stride
);
1105 /* RSS related functions */
1107 static int mlx4_en_config_rss_qp(struct mlx4_en_priv
*priv
, int qpn
,
1108 struct mlx4_en_rx_ring
*ring
,
1109 enum mlx4_qp_state
*state
,
1112 struct mlx4_en_dev
*mdev
= priv
->mdev
;
1113 struct mlx4_qp_context
*context
;
1116 context
= kmalloc(sizeof(*context
), GFP_KERNEL
);
1120 err
= mlx4_qp_alloc(mdev
->dev
, qpn
, qp
, GFP_KERNEL
);
1122 en_err(priv
, "Failed to allocate qp #%x\n", qpn
);
1125 qp
->event
= mlx4_en_sqp_event
;
1127 memset(context
, 0, sizeof *context
);
1128 mlx4_en_fill_qp_context(priv
, ring
->actual_size
, ring
->stride
, 0, 0,
1129 qpn
, ring
->cqn
, -1, context
);
1130 context
->db_rec_addr
= cpu_to_be64(ring
->wqres
.db
.dma
);
1132 /* Cancel FCS removal if FW allows */
1133 if (mdev
->dev
->caps
.flags
& MLX4_DEV_CAP_FLAG_FCS_KEEP
) {
1134 context
->param3
|= cpu_to_be32(1 << 29);
1135 if (priv
->dev
->features
& NETIF_F_RXFCS
)
1138 ring
->fcs_del
= ETH_FCS_LEN
;
1142 err
= mlx4_qp_to_ready(mdev
->dev
, &ring
->wqres
.mtt
, context
, qp
, state
);
1144 mlx4_qp_remove(mdev
->dev
, qp
);
1145 mlx4_qp_free(mdev
->dev
, qp
);
1147 mlx4_en_update_rx_prod_db(ring
);
1153 int mlx4_en_create_drop_qp(struct mlx4_en_priv
*priv
)
1158 err
= mlx4_qp_reserve_range(priv
->mdev
->dev
, 1, 1, &qpn
,
1159 MLX4_RESERVE_A0_QP
);
1161 en_err(priv
, "Failed reserving drop qpn\n");
1164 err
= mlx4_qp_alloc(priv
->mdev
->dev
, qpn
, &priv
->drop_qp
, GFP_KERNEL
);
1166 en_err(priv
, "Failed allocating drop qp\n");
1167 mlx4_qp_release_range(priv
->mdev
->dev
, qpn
, 1);
1174 void mlx4_en_destroy_drop_qp(struct mlx4_en_priv
*priv
)
1178 qpn
= priv
->drop_qp
.qpn
;
1179 mlx4_qp_remove(priv
->mdev
->dev
, &priv
->drop_qp
);
1180 mlx4_qp_free(priv
->mdev
->dev
, &priv
->drop_qp
);
1181 mlx4_qp_release_range(priv
->mdev
->dev
, qpn
, 1);
1184 /* Allocate rx qp's and configure them according to rss map */
1185 int mlx4_en_config_rss_steer(struct mlx4_en_priv
*priv
)
1187 struct mlx4_en_dev
*mdev
= priv
->mdev
;
1188 struct mlx4_en_rss_map
*rss_map
= &priv
->rss_map
;
1189 struct mlx4_qp_context context
;
1190 struct mlx4_rss_context
*rss_context
;
1193 u8 rss_mask
= (MLX4_RSS_IPV4
| MLX4_RSS_TCP_IPV4
| MLX4_RSS_IPV6
|
1199 en_dbg(DRV
, priv
, "Configuring rss steering\n");
1200 err
= mlx4_qp_reserve_range(mdev
->dev
, priv
->rx_ring_num
,
1202 &rss_map
->base_qpn
, 0);
1204 en_err(priv
, "Failed reserving %d qps\n", priv
->rx_ring_num
);
1208 for (i
= 0; i
< priv
->rx_ring_num
; i
++) {
1209 qpn
= rss_map
->base_qpn
+ i
;
1210 err
= mlx4_en_config_rss_qp(priv
, qpn
, priv
->rx_ring
[i
],
1219 /* Configure RSS indirection qp */
1220 err
= mlx4_qp_alloc(mdev
->dev
, priv
->base_qpn
, &rss_map
->indir_qp
, GFP_KERNEL
);
1222 en_err(priv
, "Failed to allocate RSS indirection QP\n");
1225 rss_map
->indir_qp
.event
= mlx4_en_sqp_event
;
1226 mlx4_en_fill_qp_context(priv
, 0, 0, 0, 1, priv
->base_qpn
,
1227 priv
->rx_ring
[0]->cqn
, -1, &context
);
1229 if (!priv
->prof
->rss_rings
|| priv
->prof
->rss_rings
> priv
->rx_ring_num
)
1230 rss_rings
= priv
->rx_ring_num
;
1232 rss_rings
= priv
->prof
->rss_rings
;
1234 ptr
= ((void *) &context
) + offsetof(struct mlx4_qp_context
, pri_path
)
1235 + MLX4_RSS_OFFSET_IN_QPC_PRI_PATH
;
1237 rss_context
->base_qpn
= cpu_to_be32(ilog2(rss_rings
) << 24 |
1238 (rss_map
->base_qpn
));
1239 rss_context
->default_qpn
= cpu_to_be32(rss_map
->base_qpn
);
1240 if (priv
->mdev
->profile
.udp_rss
) {
1241 rss_mask
|= MLX4_RSS_UDP_IPV4
| MLX4_RSS_UDP_IPV6
;
1242 rss_context
->base_qpn_udp
= rss_context
->default_qpn
;
1245 if (mdev
->dev
->caps
.tunnel_offload_mode
== MLX4_TUNNEL_OFFLOAD_MODE_VXLAN
) {
1246 en_info(priv
, "Setting RSS context tunnel type to RSS on inner headers\n");
1247 rss_mask
|= MLX4_RSS_BY_INNER_HEADERS
;
1250 rss_context
->flags
= rss_mask
;
1251 rss_context
->hash_fn
= MLX4_RSS_HASH_TOP
;
1252 if (priv
->rss_hash_fn
== ETH_RSS_HASH_XOR
) {
1253 rss_context
->hash_fn
= MLX4_RSS_HASH_XOR
;
1254 } else if (priv
->rss_hash_fn
== ETH_RSS_HASH_TOP
) {
1255 rss_context
->hash_fn
= MLX4_RSS_HASH_TOP
;
1256 memcpy(rss_context
->rss_key
, priv
->rss_key
,
1257 MLX4_EN_RSS_KEY_SIZE
);
1259 en_err(priv
, "Unknown RSS hash function requested\n");
1263 err
= mlx4_qp_to_ready(mdev
->dev
, &priv
->res
.mtt
, &context
,
1264 &rss_map
->indir_qp
, &rss_map
->indir_state
);
1271 mlx4_qp_modify(mdev
->dev
, NULL
, rss_map
->indir_state
,
1272 MLX4_QP_STATE_RST
, NULL
, 0, 0, &rss_map
->indir_qp
);
1273 mlx4_qp_remove(mdev
->dev
, &rss_map
->indir_qp
);
1274 mlx4_qp_free(mdev
->dev
, &rss_map
->indir_qp
);
1276 for (i
= 0; i
< good_qps
; i
++) {
1277 mlx4_qp_modify(mdev
->dev
, NULL
, rss_map
->state
[i
],
1278 MLX4_QP_STATE_RST
, NULL
, 0, 0, &rss_map
->qps
[i
]);
1279 mlx4_qp_remove(mdev
->dev
, &rss_map
->qps
[i
]);
1280 mlx4_qp_free(mdev
->dev
, &rss_map
->qps
[i
]);
1282 mlx4_qp_release_range(mdev
->dev
, rss_map
->base_qpn
, priv
->rx_ring_num
);
1286 void mlx4_en_release_rss_steer(struct mlx4_en_priv
*priv
)
1288 struct mlx4_en_dev
*mdev
= priv
->mdev
;
1289 struct mlx4_en_rss_map
*rss_map
= &priv
->rss_map
;
1292 mlx4_qp_modify(mdev
->dev
, NULL
, rss_map
->indir_state
,
1293 MLX4_QP_STATE_RST
, NULL
, 0, 0, &rss_map
->indir_qp
);
1294 mlx4_qp_remove(mdev
->dev
, &rss_map
->indir_qp
);
1295 mlx4_qp_free(mdev
->dev
, &rss_map
->indir_qp
);
1297 for (i
= 0; i
< priv
->rx_ring_num
; i
++) {
1298 mlx4_qp_modify(mdev
->dev
, NULL
, rss_map
->state
[i
],
1299 MLX4_QP_STATE_RST
, NULL
, 0, 0, &rss_map
->qps
[i
]);
1300 mlx4_qp_remove(mdev
->dev
, &rss_map
->qps
[i
]);
1301 mlx4_qp_free(mdev
->dev
, &rss_map
->qps
[i
]);
1303 mlx4_qp_release_range(mdev
->dev
, rss_map
->base_qpn
, priv
->rx_ring_num
);