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
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/if_vlan.h>
40 #include <linux/vmalloc.h>
41 #include <linux/tcp.h>
42 #include <linux/moduleparam.h>
47 MAX_INLINE
= 104, /* 128 - 16 - 4 - 4 */
51 static int inline_thold __read_mostly
= MAX_INLINE
;
53 module_param_named(inline_thold
, inline_thold
, int, 0444);
54 MODULE_PARM_DESC(inline_thold
, "threshold for using inline data");
56 int mlx4_en_create_tx_ring(struct mlx4_en_priv
*priv
,
57 struct mlx4_en_tx_ring
*ring
, int qpn
, u32 size
,
60 struct mlx4_en_dev
*mdev
= priv
->mdev
;
65 ring
->size_mask
= size
- 1;
66 ring
->stride
= stride
;
68 inline_thold
= min(inline_thold
, MAX_INLINE
);
70 tmp
= size
* sizeof(struct mlx4_en_tx_info
);
71 ring
->tx_info
= vmalloc(tmp
);
75 en_dbg(DRV
, priv
, "Allocated tx_info ring at addr:%p size:%d\n",
78 ring
->bounce_buf
= kmalloc(MAX_DESC_SIZE
, GFP_KERNEL
);
79 if (!ring
->bounce_buf
) {
83 ring
->buf_size
= ALIGN(size
* ring
->stride
, MLX4_EN_PAGE_SIZE
);
85 err
= mlx4_alloc_hwq_res(mdev
->dev
, &ring
->wqres
, ring
->buf_size
,
88 en_err(priv
, "Failed allocating hwq resources\n");
92 err
= mlx4_en_map_buffer(&ring
->wqres
.buf
);
94 en_err(priv
, "Failed to map TX buffer\n");
98 ring
->buf
= ring
->wqres
.buf
.direct
.buf
;
100 en_dbg(DRV
, priv
, "Allocated TX ring (addr:%p) - buf:%p size:%d "
101 "buf_size:%d dma:%llx\n", ring
, ring
->buf
, ring
->size
,
102 ring
->buf_size
, (unsigned long long) ring
->wqres
.buf
.direct
.map
);
105 err
= mlx4_qp_alloc(mdev
->dev
, ring
->qpn
, &ring
->qp
);
107 en_err(priv
, "Failed allocating qp %d\n", ring
->qpn
);
110 ring
->qp
.event
= mlx4_en_sqp_event
;
112 err
= mlx4_bf_alloc(mdev
->dev
, &ring
->bf
);
114 en_dbg(DRV
, priv
, "working without blueflame (%d)", err
);
115 ring
->bf
.uar
= &mdev
->priv_uar
;
116 ring
->bf
.uar
->map
= mdev
->uar_map
;
117 ring
->bf_enabled
= false;
119 ring
->bf_enabled
= true;
124 mlx4_en_unmap_buffer(&ring
->wqres
.buf
);
126 mlx4_free_hwq_res(mdev
->dev
, &ring
->wqres
, ring
->buf_size
);
128 kfree(ring
->bounce_buf
);
129 ring
->bounce_buf
= NULL
;
131 vfree(ring
->tx_info
);
132 ring
->tx_info
= NULL
;
136 void mlx4_en_destroy_tx_ring(struct mlx4_en_priv
*priv
,
137 struct mlx4_en_tx_ring
*ring
)
139 struct mlx4_en_dev
*mdev
= priv
->mdev
;
140 en_dbg(DRV
, priv
, "Destroying tx ring, qpn: %d\n", ring
->qpn
);
142 if (ring
->bf_enabled
)
143 mlx4_bf_free(mdev
->dev
, &ring
->bf
);
144 mlx4_qp_remove(mdev
->dev
, &ring
->qp
);
145 mlx4_qp_free(mdev
->dev
, &ring
->qp
);
146 mlx4_en_unmap_buffer(&ring
->wqres
.buf
);
147 mlx4_free_hwq_res(mdev
->dev
, &ring
->wqres
, ring
->buf_size
);
148 kfree(ring
->bounce_buf
);
149 ring
->bounce_buf
= NULL
;
150 vfree(ring
->tx_info
);
151 ring
->tx_info
= NULL
;
154 int mlx4_en_activate_tx_ring(struct mlx4_en_priv
*priv
,
155 struct mlx4_en_tx_ring
*ring
,
156 int cq
, int user_prio
)
158 struct mlx4_en_dev
*mdev
= priv
->mdev
;
163 ring
->cons
= 0xffffffff;
164 ring
->last_nr_txbb
= 1;
166 memset(ring
->tx_info
, 0, ring
->size
* sizeof(struct mlx4_en_tx_info
));
167 memset(ring
->buf
, 0, ring
->buf_size
);
169 ring
->qp_state
= MLX4_QP_STATE_RST
;
170 ring
->doorbell_qpn
= ring
->qp
.qpn
<< 8;
172 mlx4_en_fill_qp_context(priv
, ring
->size
, ring
->stride
, 1, 0, ring
->qpn
,
173 ring
->cqn
, user_prio
, &ring
->context
);
174 if (ring
->bf_enabled
)
175 ring
->context
.usr_page
= cpu_to_be32(ring
->bf
.uar
->index
);
177 err
= mlx4_qp_to_ready(mdev
->dev
, &ring
->wqres
.mtt
, &ring
->context
,
178 &ring
->qp
, &ring
->qp_state
);
183 void mlx4_en_deactivate_tx_ring(struct mlx4_en_priv
*priv
,
184 struct mlx4_en_tx_ring
*ring
)
186 struct mlx4_en_dev
*mdev
= priv
->mdev
;
188 mlx4_qp_modify(mdev
->dev
, NULL
, ring
->qp_state
,
189 MLX4_QP_STATE_RST
, NULL
, 0, 0, &ring
->qp
);
193 static u32
mlx4_en_free_tx_desc(struct mlx4_en_priv
*priv
,
194 struct mlx4_en_tx_ring
*ring
,
197 struct mlx4_en_tx_info
*tx_info
= &ring
->tx_info
[index
];
198 struct mlx4_en_tx_desc
*tx_desc
= ring
->buf
+ index
* TXBB_SIZE
;
199 struct mlx4_wqe_data_seg
*data
= (void *) tx_desc
+ tx_info
->data_offset
;
200 struct sk_buff
*skb
= tx_info
->skb
;
201 struct skb_frag_struct
*frag
;
202 void *end
= ring
->buf
+ ring
->buf_size
;
203 int frags
= skb_shinfo(skb
)->nr_frags
;
205 __be32
*ptr
= (__be32
*)tx_desc
;
206 __be32 stamp
= cpu_to_be32(STAMP_VAL
| (!!owner
<< STAMP_SHIFT
));
208 /* Optimize the common case when there are no wraparounds */
209 if (likely((void *) tx_desc
+ tx_info
->nr_txbb
* TXBB_SIZE
<= end
)) {
211 if (tx_info
->linear
) {
212 dma_unmap_single(priv
->ddev
,
213 (dma_addr_t
) be64_to_cpu(data
->addr
),
214 be32_to_cpu(data
->byte_count
),
219 for (i
= 0; i
< frags
; i
++) {
220 frag
= &skb_shinfo(skb
)->frags
[i
];
221 dma_unmap_page(priv
->ddev
,
222 (dma_addr_t
) be64_to_cpu(data
[i
].addr
),
223 skb_frag_size(frag
), PCI_DMA_TODEVICE
);
226 /* Stamp the freed descriptor */
227 for (i
= 0; i
< tx_info
->nr_txbb
* TXBB_SIZE
; i
+= STAMP_STRIDE
) {
234 if ((void *) data
>= end
) {
235 data
= ring
->buf
+ ((void *)data
- end
);
238 if (tx_info
->linear
) {
239 dma_unmap_single(priv
->ddev
,
240 (dma_addr_t
) be64_to_cpu(data
->addr
),
241 be32_to_cpu(data
->byte_count
),
246 for (i
= 0; i
< frags
; i
++) {
247 /* Check for wraparound before unmapping */
248 if ((void *) data
>= end
)
250 frag
= &skb_shinfo(skb
)->frags
[i
];
251 dma_unmap_page(priv
->ddev
,
252 (dma_addr_t
) be64_to_cpu(data
->addr
),
253 skb_frag_size(frag
), PCI_DMA_TODEVICE
);
257 /* Stamp the freed descriptor */
258 for (i
= 0; i
< tx_info
->nr_txbb
* TXBB_SIZE
; i
+= STAMP_STRIDE
) {
261 if ((void *) ptr
>= end
) {
263 stamp
^= cpu_to_be32(0x80000000);
268 dev_kfree_skb_any(skb
);
269 return tx_info
->nr_txbb
;
273 int mlx4_en_free_tx_buf(struct net_device
*dev
, struct mlx4_en_tx_ring
*ring
)
275 struct mlx4_en_priv
*priv
= netdev_priv(dev
);
278 /* Skip last polled descriptor */
279 ring
->cons
+= ring
->last_nr_txbb
;
280 en_dbg(DRV
, priv
, "Freeing Tx buf - cons:0x%x prod:0x%x\n",
281 ring
->cons
, ring
->prod
);
283 if ((u32
) (ring
->prod
- ring
->cons
) > ring
->size
) {
284 if (netif_msg_tx_err(priv
))
285 en_warn(priv
, "Tx consumer passed producer!\n");
289 while (ring
->cons
!= ring
->prod
) {
290 ring
->last_nr_txbb
= mlx4_en_free_tx_desc(priv
, ring
,
291 ring
->cons
& ring
->size_mask
,
292 !!(ring
->cons
& ring
->size
));
293 ring
->cons
+= ring
->last_nr_txbb
;
297 netdev_tx_reset_queue(ring
->tx_queue
);
300 en_dbg(DRV
, priv
, "Freed %d uncompleted tx descriptors\n", cnt
);
305 static void mlx4_en_process_tx_cq(struct net_device
*dev
, struct mlx4_en_cq
*cq
)
307 struct mlx4_en_priv
*priv
= netdev_priv(dev
);
308 struct mlx4_cq
*mcq
= &cq
->mcq
;
309 struct mlx4_en_tx_ring
*ring
= &priv
->tx_ring
[cq
->ring
];
310 struct mlx4_cqe
*cqe
;
312 u16 new_index
, ring_index
;
313 u32 txbbs_skipped
= 0;
314 u32 cons_index
= mcq
->cons_index
;
316 u32 size_mask
= ring
->size_mask
;
317 struct mlx4_cqe
*buf
= cq
->buf
;
320 int factor
= priv
->cqe_factor
;
325 index
= cons_index
& size_mask
;
326 cqe
= &buf
[(index
<< factor
) + factor
];
327 ring_index
= ring
->cons
& size_mask
;
329 /* Process all completed CQEs */
330 while (XNOR(cqe
->owner_sr_opcode
& MLX4_CQE_OWNER_MASK
,
331 cons_index
& size
)) {
333 * make sure we read the CQE after we read the
338 /* Skip over last polled CQE */
339 new_index
= be16_to_cpu(cqe
->wqe_index
) & size_mask
;
342 txbbs_skipped
+= ring
->last_nr_txbb
;
343 ring_index
= (ring_index
+ ring
->last_nr_txbb
) & size_mask
;
344 /* free next descriptor */
345 ring
->last_nr_txbb
= mlx4_en_free_tx_desc(
346 priv
, ring
, ring_index
,
347 !!((ring
->cons
+ txbbs_skipped
) &
350 bytes
+= ring
->tx_info
[ring_index
].nr_bytes
;
351 } while (ring_index
!= new_index
);
354 index
= cons_index
& size_mask
;
355 cqe
= &buf
[(index
<< factor
) + factor
];
360 * To prevent CQ overflow we first update CQ consumer and only then
363 mcq
->cons_index
= cons_index
;
366 ring
->cons
+= txbbs_skipped
;
367 netdev_tx_completed_queue(ring
->tx_queue
, packets
, bytes
);
370 * Wakeup Tx queue if this stopped, and at least 1 packet
373 if (netif_tx_queue_stopped(ring
->tx_queue
) && txbbs_skipped
> 0) {
374 netif_tx_wake_queue(ring
->tx_queue
);
375 priv
->port_stats
.wake_queue
++;
379 void mlx4_en_tx_irq(struct mlx4_cq
*mcq
)
381 struct mlx4_en_cq
*cq
= container_of(mcq
, struct mlx4_en_cq
, mcq
);
382 struct mlx4_en_priv
*priv
= netdev_priv(cq
->dev
);
384 mlx4_en_process_tx_cq(cq
->dev
, cq
);
385 mlx4_en_arm_cq(priv
, cq
);
389 static struct mlx4_en_tx_desc
*mlx4_en_bounce_to_desc(struct mlx4_en_priv
*priv
,
390 struct mlx4_en_tx_ring
*ring
,
392 unsigned int desc_size
)
394 u32 copy
= (ring
->size
- index
) * TXBB_SIZE
;
397 for (i
= desc_size
- copy
- 4; i
>= 0; i
-= 4) {
398 if ((i
& (TXBB_SIZE
- 1)) == 0)
401 *((u32
*) (ring
->buf
+ i
)) =
402 *((u32
*) (ring
->bounce_buf
+ copy
+ i
));
405 for (i
= copy
- 4; i
>= 4 ; i
-= 4) {
406 if ((i
& (TXBB_SIZE
- 1)) == 0)
409 *((u32
*) (ring
->buf
+ index
* TXBB_SIZE
+ i
)) =
410 *((u32
*) (ring
->bounce_buf
+ i
));
413 /* Return real descriptor location */
414 return ring
->buf
+ index
* TXBB_SIZE
;
417 static int is_inline(struct sk_buff
*skb
, void **pfrag
)
421 if (inline_thold
&& !skb_is_gso(skb
) && skb
->len
<= inline_thold
) {
422 if (skb_shinfo(skb
)->nr_frags
== 1) {
423 ptr
= skb_frag_address_safe(&skb_shinfo(skb
)->frags
[0]);
431 } else if (unlikely(skb_shinfo(skb
)->nr_frags
))
440 static int inline_size(struct sk_buff
*skb
)
442 if (skb
->len
+ CTRL_SIZE
+ sizeof(struct mlx4_wqe_inline_seg
)
443 <= MLX4_INLINE_ALIGN
)
444 return ALIGN(skb
->len
+ CTRL_SIZE
+
445 sizeof(struct mlx4_wqe_inline_seg
), 16);
447 return ALIGN(skb
->len
+ CTRL_SIZE
+ 2 *
448 sizeof(struct mlx4_wqe_inline_seg
), 16);
451 static int get_real_size(struct sk_buff
*skb
, struct net_device
*dev
,
452 int *lso_header_size
)
454 struct mlx4_en_priv
*priv
= netdev_priv(dev
);
457 if (skb_is_gso(skb
)) {
458 *lso_header_size
= skb_transport_offset(skb
) + tcp_hdrlen(skb
);
459 real_size
= CTRL_SIZE
+ skb_shinfo(skb
)->nr_frags
* DS_SIZE
+
460 ALIGN(*lso_header_size
+ 4, DS_SIZE
);
461 if (unlikely(*lso_header_size
!= skb_headlen(skb
))) {
462 /* We add a segment for the skb linear buffer only if
463 * it contains data */
464 if (*lso_header_size
< skb_headlen(skb
))
465 real_size
+= DS_SIZE
;
467 if (netif_msg_tx_err(priv
))
468 en_warn(priv
, "Non-linear headers\n");
473 *lso_header_size
= 0;
474 if (!is_inline(skb
, NULL
))
475 real_size
= CTRL_SIZE
+ (skb_shinfo(skb
)->nr_frags
+ 1) * DS_SIZE
;
477 real_size
= inline_size(skb
);
483 static void build_inline_wqe(struct mlx4_en_tx_desc
*tx_desc
, struct sk_buff
*skb
,
484 int real_size
, u16
*vlan_tag
, int tx_ind
, void *fragptr
)
486 struct mlx4_wqe_inline_seg
*inl
= &tx_desc
->inl
;
487 int spc
= MLX4_INLINE_ALIGN
- CTRL_SIZE
- sizeof *inl
;
489 if (skb
->len
<= spc
) {
490 inl
->byte_count
= cpu_to_be32(1 << 31 | skb
->len
);
491 skb_copy_from_linear_data(skb
, inl
+ 1, skb_headlen(skb
));
492 if (skb_shinfo(skb
)->nr_frags
)
493 memcpy(((void *)(inl
+ 1)) + skb_headlen(skb
), fragptr
,
494 skb_frag_size(&skb_shinfo(skb
)->frags
[0]));
497 inl
->byte_count
= cpu_to_be32(1 << 31 | spc
);
498 if (skb_headlen(skb
) <= spc
) {
499 skb_copy_from_linear_data(skb
, inl
+ 1, skb_headlen(skb
));
500 if (skb_headlen(skb
) < spc
) {
501 memcpy(((void *)(inl
+ 1)) + skb_headlen(skb
),
502 fragptr
, spc
- skb_headlen(skb
));
503 fragptr
+= spc
- skb_headlen(skb
);
505 inl
= (void *) (inl
+ 1) + spc
;
506 memcpy(((void *)(inl
+ 1)), fragptr
, skb
->len
- spc
);
508 skb_copy_from_linear_data(skb
, inl
+ 1, spc
);
509 inl
= (void *) (inl
+ 1) + spc
;
510 skb_copy_from_linear_data_offset(skb
, spc
, inl
+ 1,
511 skb_headlen(skb
) - spc
);
512 if (skb_shinfo(skb
)->nr_frags
)
513 memcpy(((void *)(inl
+ 1)) + skb_headlen(skb
) - spc
,
514 fragptr
, skb_frag_size(&skb_shinfo(skb
)->frags
[0]));
518 inl
->byte_count
= cpu_to_be32(1 << 31 | (skb
->len
- spc
));
522 u16
mlx4_en_select_queue(struct net_device
*dev
, struct sk_buff
*skb
)
524 struct mlx4_en_priv
*priv
= netdev_priv(dev
);
525 u16 rings_p_up
= priv
->num_tx_rings_p_up
;
529 return skb_tx_hash(dev
, skb
);
531 if (vlan_tx_tag_present(skb
))
532 up
= vlan_tx_tag_get(skb
) >> VLAN_PRIO_SHIFT
;
534 return __skb_tx_hash(dev
, skb
, rings_p_up
) + up
* rings_p_up
;
537 static void mlx4_bf_copy(void __iomem
*dst
, unsigned long *src
, unsigned bytecnt
)
539 __iowrite64_copy(dst
, src
, bytecnt
/ 8);
542 netdev_tx_t
mlx4_en_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
544 struct mlx4_en_priv
*priv
= netdev_priv(dev
);
545 struct mlx4_en_dev
*mdev
= priv
->mdev
;
546 struct mlx4_en_tx_ring
*ring
;
547 struct mlx4_en_tx_desc
*tx_desc
;
548 struct mlx4_wqe_data_seg
*data
;
549 struct skb_frag_struct
*frag
;
550 struct mlx4_en_tx_info
*tx_info
;
568 real_size
= get_real_size(skb
, dev
, &lso_header_size
);
569 if (unlikely(!real_size
))
572 /* Align descriptor to TXBB size */
573 desc_size
= ALIGN(real_size
, TXBB_SIZE
);
574 nr_txbb
= desc_size
/ TXBB_SIZE
;
575 if (unlikely(nr_txbb
> MAX_DESC_TXBBS
)) {
576 if (netif_msg_tx_err(priv
))
577 en_warn(priv
, "Oversized header or SG list\n");
581 tx_ind
= skb
->queue_mapping
;
582 ring
= &priv
->tx_ring
[tx_ind
];
583 if (vlan_tx_tag_present(skb
))
584 vlan_tag
= vlan_tx_tag_get(skb
);
586 /* Check available TXBBs And 2K spare for prefetch */
587 if (unlikely(((int)(ring
->prod
- ring
->cons
)) >
588 ring
->size
- HEADROOM
- MAX_DESC_TXBBS
)) {
589 /* every full Tx ring stops queue */
590 netif_tx_stop_queue(ring
->tx_queue
);
591 priv
->port_stats
.queue_stopped
++;
593 /* If queue was emptied after the if, and before the
594 * stop_queue - need to wake the queue, or else it will remain
596 * Need a memory barrier to make sure ring->cons was not
597 * updated before queue was stopped.
601 if (unlikely(((int)(ring
->prod
- ring
->cons
)) <=
602 ring
->size
- HEADROOM
- MAX_DESC_TXBBS
)) {
603 netif_tx_wake_queue(ring
->tx_queue
);
604 priv
->port_stats
.wake_queue
++;
606 return NETDEV_TX_BUSY
;
610 /* Track current inflight packets for performance analysis */
611 AVG_PERF_COUNTER(priv
->pstats
.inflight_avg
,
612 (u32
) (ring
->prod
- ring
->cons
- 1));
614 /* Packet is good - grab an index and transmit it */
615 index
= ring
->prod
& ring
->size_mask
;
616 bf_index
= ring
->prod
;
618 /* See if we have enough space for whole descriptor TXBB for setting
619 * SW ownership on next descriptor; if not, use a bounce buffer. */
620 if (likely(index
+ nr_txbb
<= ring
->size
))
621 tx_desc
= ring
->buf
+ index
* TXBB_SIZE
;
623 tx_desc
= (struct mlx4_en_tx_desc
*) ring
->bounce_buf
;
627 /* Save skb in tx_info ring */
628 tx_info
= &ring
->tx_info
[index
];
630 tx_info
->nr_txbb
= nr_txbb
;
632 /* Prepare ctrl segement apart opcode+ownership, which depends on
633 * whether LSO is used */
634 tx_desc
->ctrl
.vlan_tag
= cpu_to_be16(vlan_tag
);
635 tx_desc
->ctrl
.ins_vlan
= MLX4_WQE_CTRL_INS_VLAN
*
636 !!vlan_tx_tag_present(skb
);
637 tx_desc
->ctrl
.fence_size
= (real_size
/ 16) & 0x3f;
638 tx_desc
->ctrl
.srcrb_flags
= priv
->ctrl_flags
;
639 if (likely(skb
->ip_summed
== CHECKSUM_PARTIAL
)) {
640 tx_desc
->ctrl
.srcrb_flags
|= cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM
|
641 MLX4_WQE_CTRL_TCP_UDP_CSUM
);
645 if (priv
->flags
& MLX4_EN_FLAG_ENABLE_HW_LOOPBACK
) {
646 /* Copy dst mac address to wqe. This allows loopback in eSwitch,
647 * so that VFs and PF can communicate with each other
649 ethh
= (struct ethhdr
*)skb
->data
;
650 tx_desc
->ctrl
.srcrb_flags16
[0] = get_unaligned((__be16
*)ethh
->h_dest
);
651 tx_desc
->ctrl
.imm
= get_unaligned((__be32
*)(ethh
->h_dest
+ 2));
654 /* Handle LSO (TSO) packets */
655 if (lso_header_size
) {
656 /* Mark opcode as LSO */
657 op_own
= cpu_to_be32(MLX4_OPCODE_LSO
| (1 << 6)) |
658 ((ring
->prod
& ring
->size
) ?
659 cpu_to_be32(MLX4_EN_BIT_DESC_OWN
) : 0);
661 /* Fill in the LSO prefix */
662 tx_desc
->lso
.mss_hdr_size
= cpu_to_be32(
663 skb_shinfo(skb
)->gso_size
<< 16 | lso_header_size
);
666 * note that we already verified that it is linear */
667 memcpy(tx_desc
->lso
.header
, skb
->data
, lso_header_size
);
668 data
= ((void *) &tx_desc
->lso
+
669 ALIGN(lso_header_size
+ 4, DS_SIZE
));
671 priv
->port_stats
.tso_packets
++;
672 i
= ((skb
->len
- lso_header_size
) / skb_shinfo(skb
)->gso_size
) +
673 !!((skb
->len
- lso_header_size
) % skb_shinfo(skb
)->gso_size
);
674 tx_info
->nr_bytes
= skb
->len
+ (i
- 1) * lso_header_size
;
677 /* Normal (Non LSO) packet */
678 op_own
= cpu_to_be32(MLX4_OPCODE_SEND
) |
679 ((ring
->prod
& ring
->size
) ?
680 cpu_to_be32(MLX4_EN_BIT_DESC_OWN
) : 0);
681 data
= &tx_desc
->data
;
682 tx_info
->nr_bytes
= max_t(unsigned int, skb
->len
, ETH_ZLEN
);
686 ring
->bytes
+= tx_info
->nr_bytes
;
687 netdev_tx_sent_queue(ring
->tx_queue
, tx_info
->nr_bytes
);
688 AVG_PERF_COUNTER(priv
->pstats
.tx_pktsz_avg
, skb
->len
);
691 /* valid only for none inline segments */
692 tx_info
->data_offset
= (void *) data
- (void *) tx_desc
;
694 tx_info
->linear
= (lso_header_size
< skb_headlen(skb
) && !is_inline(skb
, NULL
)) ? 1 : 0;
695 data
+= skb_shinfo(skb
)->nr_frags
+ tx_info
->linear
- 1;
697 if (!is_inline(skb
, &fragptr
)) {
699 for (i
= skb_shinfo(skb
)->nr_frags
- 1; i
>= 0; i
--) {
700 frag
= &skb_shinfo(skb
)->frags
[i
];
701 dma
= skb_frag_dma_map(priv
->ddev
, frag
,
702 0, skb_frag_size(frag
),
704 data
->addr
= cpu_to_be64(dma
);
705 data
->lkey
= cpu_to_be32(mdev
->mr
.key
);
707 data
->byte_count
= cpu_to_be32(skb_frag_size(frag
));
711 /* Map linear part */
712 if (tx_info
->linear
) {
713 dma
= dma_map_single(priv
->ddev
, skb
->data
+ lso_header_size
,
714 skb_headlen(skb
) - lso_header_size
, PCI_DMA_TODEVICE
);
715 data
->addr
= cpu_to_be64(dma
);
716 data
->lkey
= cpu_to_be32(mdev
->mr
.key
);
718 data
->byte_count
= cpu_to_be32(skb_headlen(skb
) - lso_header_size
);
722 build_inline_wqe(tx_desc
, skb
, real_size
, &vlan_tag
, tx_ind
, fragptr
);
726 ring
->prod
+= nr_txbb
;
728 /* If we used a bounce buffer then copy descriptor back into place */
730 tx_desc
= mlx4_en_bounce_to_desc(priv
, ring
, index
, desc_size
);
732 if (ring
->bf_enabled
&& desc_size
<= MAX_BF
&& !bounce
&& !vlan_tx_tag_present(skb
)) {
733 *(__be32
*) (&tx_desc
->ctrl
.vlan_tag
) |= cpu_to_be32(ring
->doorbell_qpn
);
734 op_own
|= htonl((bf_index
& 0xffff) << 8);
735 /* Ensure new descirptor hits memory
736 * before setting ownership of this descriptor to HW */
738 tx_desc
->ctrl
.owner_opcode
= op_own
;
742 mlx4_bf_copy(ring
->bf
.reg
+ ring
->bf
.offset
, (unsigned long *) &tx_desc
->ctrl
,
747 ring
->bf
.offset
^= ring
->bf
.buf_size
;
749 /* Ensure new descirptor hits memory
750 * before setting ownership of this descriptor to HW */
752 tx_desc
->ctrl
.owner_opcode
= op_own
;
754 iowrite32be(ring
->doorbell_qpn
, ring
->bf
.uar
->map
+ MLX4_SEND_DOORBELL
);
760 dev_kfree_skb_any(skb
);
761 priv
->stats
.tx_dropped
++;