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virtio: Silence uninitialized variable warning
[deliverable/linux.git] / drivers / net / ethernet / mellanox / mlx4 / en_tx.c
1 /*
2 * Copyright (c) 2007 Mellanox Technologies. All rights reserved.
3 *
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:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
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.
22 *
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
30 * SOFTWARE.
31 *
32 */
33
34 #include <asm/page.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/if_vlan.h>
40 #include <linux/prefetch.h>
41 #include <linux/vmalloc.h>
42 #include <linux/tcp.h>
43 #include <linux/ip.h>
44 #include <linux/moduleparam.h>
45
46 #include "mlx4_en.h"
47
48 int mlx4_en_create_tx_ring(struct mlx4_en_priv *priv,
49 struct mlx4_en_tx_ring **pring, u32 size,
50 u16 stride, int node, int queue_index)
51 {
52 struct mlx4_en_dev *mdev = priv->mdev;
53 struct mlx4_en_tx_ring *ring;
54 int tmp;
55 int err;
56
57 ring = kzalloc_node(sizeof(*ring), GFP_KERNEL, node);
58 if (!ring) {
59 ring = kzalloc(sizeof(*ring), GFP_KERNEL);
60 if (!ring) {
61 en_err(priv, "Failed allocating TX ring\n");
62 return -ENOMEM;
63 }
64 }
65
66 ring->size = size;
67 ring->size_mask = size - 1;
68 ring->stride = stride;
69 ring->full_size = ring->size - HEADROOM - MAX_DESC_TXBBS;
70
71 tmp = size * sizeof(struct mlx4_en_tx_info);
72 ring->tx_info = kmalloc_node(tmp, GFP_KERNEL | __GFP_NOWARN, node);
73 if (!ring->tx_info) {
74 ring->tx_info = vmalloc(tmp);
75 if (!ring->tx_info) {
76 err = -ENOMEM;
77 goto err_ring;
78 }
79 }
80
81 en_dbg(DRV, priv, "Allocated tx_info ring at addr:%p size:%d\n",
82 ring->tx_info, tmp);
83
84 ring->bounce_buf = kmalloc_node(MAX_DESC_SIZE, GFP_KERNEL, node);
85 if (!ring->bounce_buf) {
86 ring->bounce_buf = kmalloc(MAX_DESC_SIZE, GFP_KERNEL);
87 if (!ring->bounce_buf) {
88 err = -ENOMEM;
89 goto err_info;
90 }
91 }
92 ring->buf_size = ALIGN(size * ring->stride, MLX4_EN_PAGE_SIZE);
93
94 /* Allocate HW buffers on provided NUMA node */
95 set_dev_node(&mdev->dev->persist->pdev->dev, node);
96 err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres, ring->buf_size,
97 2 * PAGE_SIZE);
98 set_dev_node(&mdev->dev->persist->pdev->dev, mdev->dev->numa_node);
99 if (err) {
100 en_err(priv, "Failed allocating hwq resources\n");
101 goto err_bounce;
102 }
103
104 err = mlx4_en_map_buffer(&ring->wqres.buf);
105 if (err) {
106 en_err(priv, "Failed to map TX buffer\n");
107 goto err_hwq_res;
108 }
109
110 ring->buf = ring->wqres.buf.direct.buf;
111
112 en_dbg(DRV, priv, "Allocated TX ring (addr:%p) - buf:%p size:%d buf_size:%d dma:%llx\n",
113 ring, ring->buf, ring->size, ring->buf_size,
114 (unsigned long long) ring->wqres.buf.direct.map);
115
116 err = mlx4_qp_reserve_range(mdev->dev, 1, 1, &ring->qpn,
117 MLX4_RESERVE_ETH_BF_QP);
118 if (err) {
119 en_err(priv, "failed reserving qp for TX ring\n");
120 goto err_map;
121 }
122
123 err = mlx4_qp_alloc(mdev->dev, ring->qpn, &ring->qp, GFP_KERNEL);
124 if (err) {
125 en_err(priv, "Failed allocating qp %d\n", ring->qpn);
126 goto err_reserve;
127 }
128 ring->qp.event = mlx4_en_sqp_event;
129
130 err = mlx4_bf_alloc(mdev->dev, &ring->bf, node);
131 if (err) {
132 en_dbg(DRV, priv, "working without blueflame (%d)\n", err);
133 ring->bf.uar = &mdev->priv_uar;
134 ring->bf.uar->map = mdev->uar_map;
135 ring->bf_enabled = false;
136 ring->bf_alloced = false;
137 priv->pflags &= ~MLX4_EN_PRIV_FLAGS_BLUEFLAME;
138 } else {
139 ring->bf_alloced = true;
140 ring->bf_enabled = !!(priv->pflags &
141 MLX4_EN_PRIV_FLAGS_BLUEFLAME);
142 }
143
144 ring->hwtstamp_tx_type = priv->hwtstamp_config.tx_type;
145 ring->queue_index = queue_index;
146
147 if (queue_index < priv->num_tx_rings_p_up)
148 cpumask_set_cpu(cpumask_local_spread(queue_index,
149 priv->mdev->dev->numa_node),
150 &ring->affinity_mask);
151
152 *pring = ring;
153 return 0;
154
155 err_reserve:
156 mlx4_qp_release_range(mdev->dev, ring->qpn, 1);
157 err_map:
158 mlx4_en_unmap_buffer(&ring->wqres.buf);
159 err_hwq_res:
160 mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
161 err_bounce:
162 kfree(ring->bounce_buf);
163 ring->bounce_buf = NULL;
164 err_info:
165 kvfree(ring->tx_info);
166 ring->tx_info = NULL;
167 err_ring:
168 kfree(ring);
169 *pring = NULL;
170 return err;
171 }
172
173 void mlx4_en_destroy_tx_ring(struct mlx4_en_priv *priv,
174 struct mlx4_en_tx_ring **pring)
175 {
176 struct mlx4_en_dev *mdev = priv->mdev;
177 struct mlx4_en_tx_ring *ring = *pring;
178 en_dbg(DRV, priv, "Destroying tx ring, qpn: %d\n", ring->qpn);
179
180 if (ring->bf_alloced)
181 mlx4_bf_free(mdev->dev, &ring->bf);
182 mlx4_qp_remove(mdev->dev, &ring->qp);
183 mlx4_qp_free(mdev->dev, &ring->qp);
184 mlx4_qp_release_range(priv->mdev->dev, ring->qpn, 1);
185 mlx4_en_unmap_buffer(&ring->wqres.buf);
186 mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
187 kfree(ring->bounce_buf);
188 ring->bounce_buf = NULL;
189 kvfree(ring->tx_info);
190 ring->tx_info = NULL;
191 kfree(ring);
192 *pring = NULL;
193 }
194
195 int mlx4_en_activate_tx_ring(struct mlx4_en_priv *priv,
196 struct mlx4_en_tx_ring *ring,
197 int cq, int user_prio)
198 {
199 struct mlx4_en_dev *mdev = priv->mdev;
200 int err;
201
202 ring->cqn = cq;
203 ring->prod = 0;
204 ring->cons = 0xffffffff;
205 ring->last_nr_txbb = 1;
206 memset(ring->tx_info, 0, ring->size * sizeof(struct mlx4_en_tx_info));
207 memset(ring->buf, 0, ring->buf_size);
208
209 ring->qp_state = MLX4_QP_STATE_RST;
210 ring->doorbell_qpn = cpu_to_be32(ring->qp.qpn << 8);
211 ring->mr_key = cpu_to_be32(mdev->mr.key);
212
213 mlx4_en_fill_qp_context(priv, ring->size, ring->stride, 1, 0, ring->qpn,
214 ring->cqn, user_prio, &ring->context);
215 if (ring->bf_alloced)
216 ring->context.usr_page =
217 cpu_to_be32(mlx4_to_hw_uar_index(mdev->dev,
218 ring->bf.uar->index));
219
220 err = mlx4_qp_to_ready(mdev->dev, &ring->wqres.mtt, &ring->context,
221 &ring->qp, &ring->qp_state);
222 if (!cpumask_empty(&ring->affinity_mask))
223 netif_set_xps_queue(priv->dev, &ring->affinity_mask,
224 ring->queue_index);
225
226 return err;
227 }
228
229 void mlx4_en_deactivate_tx_ring(struct mlx4_en_priv *priv,
230 struct mlx4_en_tx_ring *ring)
231 {
232 struct mlx4_en_dev *mdev = priv->mdev;
233
234 mlx4_qp_modify(mdev->dev, NULL, ring->qp_state,
235 MLX4_QP_STATE_RST, NULL, 0, 0, &ring->qp);
236 }
237
238 static inline bool mlx4_en_is_tx_ring_full(struct mlx4_en_tx_ring *ring)
239 {
240 return ring->prod - ring->cons > ring->full_size;
241 }
242
243 static void mlx4_en_stamp_wqe(struct mlx4_en_priv *priv,
244 struct mlx4_en_tx_ring *ring, int index,
245 u8 owner)
246 {
247 __be32 stamp = cpu_to_be32(STAMP_VAL | (!!owner << STAMP_SHIFT));
248 struct mlx4_en_tx_desc *tx_desc = ring->buf + index * TXBB_SIZE;
249 struct mlx4_en_tx_info *tx_info = &ring->tx_info[index];
250 void *end = ring->buf + ring->buf_size;
251 __be32 *ptr = (__be32 *)tx_desc;
252 int i;
253
254 /* Optimize the common case when there are no wraparounds */
255 if (likely((void *)tx_desc + tx_info->nr_txbb * TXBB_SIZE <= end)) {
256 /* Stamp the freed descriptor */
257 for (i = 0; i < tx_info->nr_txbb * TXBB_SIZE;
258 i += STAMP_STRIDE) {
259 *ptr = stamp;
260 ptr += STAMP_DWORDS;
261 }
262 } else {
263 /* Stamp the freed descriptor */
264 for (i = 0; i < tx_info->nr_txbb * TXBB_SIZE;
265 i += STAMP_STRIDE) {
266 *ptr = stamp;
267 ptr += STAMP_DWORDS;
268 if ((void *)ptr >= end) {
269 ptr = ring->buf;
270 stamp ^= cpu_to_be32(0x80000000);
271 }
272 }
273 }
274 }
275
276
277 static u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv,
278 struct mlx4_en_tx_ring *ring,
279 int index, u8 owner, u64 timestamp,
280 int napi_mode)
281 {
282 struct mlx4_en_tx_info *tx_info = &ring->tx_info[index];
283 struct mlx4_en_tx_desc *tx_desc = ring->buf + index * TXBB_SIZE;
284 struct mlx4_wqe_data_seg *data = (void *) tx_desc + tx_info->data_offset;
285 void *end = ring->buf + ring->buf_size;
286 struct sk_buff *skb = tx_info->skb;
287 int nr_maps = tx_info->nr_maps;
288 int i;
289
290 /* We do not touch skb here, so prefetch skb->users location
291 * to speedup consume_skb()
292 */
293 prefetchw(&skb->users);
294
295 if (unlikely(timestamp)) {
296 struct skb_shared_hwtstamps hwts;
297
298 mlx4_en_fill_hwtstamps(priv->mdev, &hwts, timestamp);
299 skb_tstamp_tx(skb, &hwts);
300 }
301
302 /* Optimize the common case when there are no wraparounds */
303 if (likely((void *) tx_desc + tx_info->nr_txbb * TXBB_SIZE <= end)) {
304 if (!tx_info->inl) {
305 if (tx_info->linear)
306 dma_unmap_single(priv->ddev,
307 tx_info->map0_dma,
308 tx_info->map0_byte_count,
309 PCI_DMA_TODEVICE);
310 else
311 dma_unmap_page(priv->ddev,
312 tx_info->map0_dma,
313 tx_info->map0_byte_count,
314 PCI_DMA_TODEVICE);
315 for (i = 1; i < nr_maps; i++) {
316 data++;
317 dma_unmap_page(priv->ddev,
318 (dma_addr_t)be64_to_cpu(data->addr),
319 be32_to_cpu(data->byte_count),
320 PCI_DMA_TODEVICE);
321 }
322 }
323 } else {
324 if (!tx_info->inl) {
325 if ((void *) data >= end) {
326 data = ring->buf + ((void *)data - end);
327 }
328
329 if (tx_info->linear)
330 dma_unmap_single(priv->ddev,
331 tx_info->map0_dma,
332 tx_info->map0_byte_count,
333 PCI_DMA_TODEVICE);
334 else
335 dma_unmap_page(priv->ddev,
336 tx_info->map0_dma,
337 tx_info->map0_byte_count,
338 PCI_DMA_TODEVICE);
339 for (i = 1; i < nr_maps; i++) {
340 data++;
341 /* Check for wraparound before unmapping */
342 if ((void *) data >= end)
343 data = ring->buf;
344 dma_unmap_page(priv->ddev,
345 (dma_addr_t)be64_to_cpu(data->addr),
346 be32_to_cpu(data->byte_count),
347 PCI_DMA_TODEVICE);
348 }
349 }
350 }
351 napi_consume_skb(skb, napi_mode);
352
353 return tx_info->nr_txbb;
354 }
355
356
357 int mlx4_en_free_tx_buf(struct net_device *dev, struct mlx4_en_tx_ring *ring)
358 {
359 struct mlx4_en_priv *priv = netdev_priv(dev);
360 int cnt = 0;
361
362 /* Skip last polled descriptor */
363 ring->cons += ring->last_nr_txbb;
364 en_dbg(DRV, priv, "Freeing Tx buf - cons:0x%x prod:0x%x\n",
365 ring->cons, ring->prod);
366
367 if ((u32) (ring->prod - ring->cons) > ring->size) {
368 if (netif_msg_tx_err(priv))
369 en_warn(priv, "Tx consumer passed producer!\n");
370 return 0;
371 }
372
373 while (ring->cons != ring->prod) {
374 ring->last_nr_txbb = mlx4_en_free_tx_desc(priv, ring,
375 ring->cons & ring->size_mask,
376 !!(ring->cons & ring->size), 0,
377 0 /* Non-NAPI caller */);
378 ring->cons += ring->last_nr_txbb;
379 cnt++;
380 }
381
382 netdev_tx_reset_queue(ring->tx_queue);
383
384 if (cnt)
385 en_dbg(DRV, priv, "Freed %d uncompleted tx descriptors\n", cnt);
386
387 return cnt;
388 }
389
390 static bool mlx4_en_process_tx_cq(struct net_device *dev,
391 struct mlx4_en_cq *cq, int napi_budget)
392 {
393 struct mlx4_en_priv *priv = netdev_priv(dev);
394 struct mlx4_cq *mcq = &cq->mcq;
395 struct mlx4_en_tx_ring *ring = priv->tx_ring[cq->ring];
396 struct mlx4_cqe *cqe;
397 u16 index;
398 u16 new_index, ring_index, stamp_index;
399 u32 txbbs_skipped = 0;
400 u32 txbbs_stamp = 0;
401 u32 cons_index = mcq->cons_index;
402 int size = cq->size;
403 u32 size_mask = ring->size_mask;
404 struct mlx4_cqe *buf = cq->buf;
405 u32 packets = 0;
406 u32 bytes = 0;
407 int factor = priv->cqe_factor;
408 u64 timestamp = 0;
409 int done = 0;
410 int budget = priv->tx_work_limit;
411 u32 last_nr_txbb;
412 u32 ring_cons;
413
414 if (!priv->port_up)
415 return true;
416
417 netdev_txq_bql_complete_prefetchw(ring->tx_queue);
418
419 index = cons_index & size_mask;
420 cqe = mlx4_en_get_cqe(buf, index, priv->cqe_size) + factor;
421 last_nr_txbb = ACCESS_ONCE(ring->last_nr_txbb);
422 ring_cons = ACCESS_ONCE(ring->cons);
423 ring_index = ring_cons & size_mask;
424 stamp_index = ring_index;
425
426 /* Process all completed CQEs */
427 while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
428 cons_index & size) && (done < budget)) {
429 /*
430 * make sure we read the CQE after we read the
431 * ownership bit
432 */
433 dma_rmb();
434
435 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
436 MLX4_CQE_OPCODE_ERROR)) {
437 struct mlx4_err_cqe *cqe_err = (struct mlx4_err_cqe *)cqe;
438
439 en_err(priv, "CQE error - vendor syndrome: 0x%x syndrome: 0x%x\n",
440 cqe_err->vendor_err_syndrome,
441 cqe_err->syndrome);
442 }
443
444 /* Skip over last polled CQE */
445 new_index = be16_to_cpu(cqe->wqe_index) & size_mask;
446
447 do {
448 txbbs_skipped += last_nr_txbb;
449 ring_index = (ring_index + last_nr_txbb) & size_mask;
450 if (ring->tx_info[ring_index].ts_requested)
451 timestamp = mlx4_en_get_cqe_ts(cqe);
452
453 /* free next descriptor */
454 last_nr_txbb = mlx4_en_free_tx_desc(
455 priv, ring, ring_index,
456 !!((ring_cons + txbbs_skipped) &
457 ring->size), timestamp, napi_budget);
458
459 mlx4_en_stamp_wqe(priv, ring, stamp_index,
460 !!((ring_cons + txbbs_stamp) &
461 ring->size));
462 stamp_index = ring_index;
463 txbbs_stamp = txbbs_skipped;
464 packets++;
465 bytes += ring->tx_info[ring_index].nr_bytes;
466 } while ((++done < budget) && (ring_index != new_index));
467
468 ++cons_index;
469 index = cons_index & size_mask;
470 cqe = mlx4_en_get_cqe(buf, index, priv->cqe_size) + factor;
471 }
472
473
474 /*
475 * To prevent CQ overflow we first update CQ consumer and only then
476 * the ring consumer.
477 */
478 mcq->cons_index = cons_index;
479 mlx4_cq_set_ci(mcq);
480 wmb();
481
482 /* we want to dirty this cache line once */
483 ACCESS_ONCE(ring->last_nr_txbb) = last_nr_txbb;
484 ACCESS_ONCE(ring->cons) = ring_cons + txbbs_skipped;
485
486 netdev_tx_completed_queue(ring->tx_queue, packets, bytes);
487
488 /* Wakeup Tx queue if this stopped, and ring is not full.
489 */
490 if (netif_tx_queue_stopped(ring->tx_queue) &&
491 !mlx4_en_is_tx_ring_full(ring)) {
492 netif_tx_wake_queue(ring->tx_queue);
493 ring->wake_queue++;
494 }
495 return done < budget;
496 }
497
498 void mlx4_en_tx_irq(struct mlx4_cq *mcq)
499 {
500 struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
501 struct mlx4_en_priv *priv = netdev_priv(cq->dev);
502
503 if (likely(priv->port_up))
504 napi_schedule_irqoff(&cq->napi);
505 else
506 mlx4_en_arm_cq(priv, cq);
507 }
508
509 /* TX CQ polling - called by NAPI */
510 int mlx4_en_poll_tx_cq(struct napi_struct *napi, int budget)
511 {
512 struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
513 struct net_device *dev = cq->dev;
514 struct mlx4_en_priv *priv = netdev_priv(dev);
515 int clean_complete;
516
517 clean_complete = mlx4_en_process_tx_cq(dev, cq, budget);
518 if (!clean_complete)
519 return budget;
520
521 napi_complete(napi);
522 mlx4_en_arm_cq(priv, cq);
523
524 return 0;
525 }
526
527 static struct mlx4_en_tx_desc *mlx4_en_bounce_to_desc(struct mlx4_en_priv *priv,
528 struct mlx4_en_tx_ring *ring,
529 u32 index,
530 unsigned int desc_size)
531 {
532 u32 copy = (ring->size - index) * TXBB_SIZE;
533 int i;
534
535 for (i = desc_size - copy - 4; i >= 0; i -= 4) {
536 if ((i & (TXBB_SIZE - 1)) == 0)
537 wmb();
538
539 *((u32 *) (ring->buf + i)) =
540 *((u32 *) (ring->bounce_buf + copy + i));
541 }
542
543 for (i = copy - 4; i >= 4 ; i -= 4) {
544 if ((i & (TXBB_SIZE - 1)) == 0)
545 wmb();
546
547 *((u32 *) (ring->buf + index * TXBB_SIZE + i)) =
548 *((u32 *) (ring->bounce_buf + i));
549 }
550
551 /* Return real descriptor location */
552 return ring->buf + index * TXBB_SIZE;
553 }
554
555 /* Decide if skb can be inlined in tx descriptor to avoid dma mapping
556 *
557 * It seems strange we do not simply use skb_copy_bits().
558 * This would allow to inline all skbs iff skb->len <= inline_thold
559 *
560 * Note that caller already checked skb was not a gso packet
561 */
562 static bool is_inline(int inline_thold, const struct sk_buff *skb,
563 const struct skb_shared_info *shinfo,
564 void **pfrag)
565 {
566 void *ptr;
567
568 if (skb->len > inline_thold || !inline_thold)
569 return false;
570
571 if (shinfo->nr_frags == 1) {
572 ptr = skb_frag_address_safe(&shinfo->frags[0]);
573 if (unlikely(!ptr))
574 return false;
575 *pfrag = ptr;
576 return true;
577 }
578 if (shinfo->nr_frags)
579 return false;
580 return true;
581 }
582
583 static int inline_size(const struct sk_buff *skb)
584 {
585 if (skb->len + CTRL_SIZE + sizeof(struct mlx4_wqe_inline_seg)
586 <= MLX4_INLINE_ALIGN)
587 return ALIGN(skb->len + CTRL_SIZE +
588 sizeof(struct mlx4_wqe_inline_seg), 16);
589 else
590 return ALIGN(skb->len + CTRL_SIZE + 2 *
591 sizeof(struct mlx4_wqe_inline_seg), 16);
592 }
593
594 static int get_real_size(const struct sk_buff *skb,
595 const struct skb_shared_info *shinfo,
596 struct net_device *dev,
597 int *lso_header_size,
598 bool *inline_ok,
599 void **pfrag)
600 {
601 struct mlx4_en_priv *priv = netdev_priv(dev);
602 int real_size;
603
604 if (shinfo->gso_size) {
605 *inline_ok = false;
606 if (skb->encapsulation)
607 *lso_header_size = (skb_inner_transport_header(skb) - skb->data) + inner_tcp_hdrlen(skb);
608 else
609 *lso_header_size = skb_transport_offset(skb) + tcp_hdrlen(skb);
610 real_size = CTRL_SIZE + shinfo->nr_frags * DS_SIZE +
611 ALIGN(*lso_header_size + 4, DS_SIZE);
612 if (unlikely(*lso_header_size != skb_headlen(skb))) {
613 /* We add a segment for the skb linear buffer only if
614 * it contains data */
615 if (*lso_header_size < skb_headlen(skb))
616 real_size += DS_SIZE;
617 else {
618 if (netif_msg_tx_err(priv))
619 en_warn(priv, "Non-linear headers\n");
620 return 0;
621 }
622 }
623 } else {
624 *lso_header_size = 0;
625 *inline_ok = is_inline(priv->prof->inline_thold, skb,
626 shinfo, pfrag);
627
628 if (*inline_ok)
629 real_size = inline_size(skb);
630 else
631 real_size = CTRL_SIZE +
632 (shinfo->nr_frags + 1) * DS_SIZE;
633 }
634
635 return real_size;
636 }
637
638 static void build_inline_wqe(struct mlx4_en_tx_desc *tx_desc,
639 const struct sk_buff *skb,
640 const struct skb_shared_info *shinfo,
641 int real_size, u16 *vlan_tag,
642 int tx_ind, void *fragptr)
643 {
644 struct mlx4_wqe_inline_seg *inl = &tx_desc->inl;
645 int spc = MLX4_INLINE_ALIGN - CTRL_SIZE - sizeof *inl;
646 unsigned int hlen = skb_headlen(skb);
647
648 if (skb->len <= spc) {
649 if (likely(skb->len >= MIN_PKT_LEN)) {
650 inl->byte_count = cpu_to_be32(1 << 31 | skb->len);
651 } else {
652 inl->byte_count = cpu_to_be32(1 << 31 | MIN_PKT_LEN);
653 memset(((void *)(inl + 1)) + skb->len, 0,
654 MIN_PKT_LEN - skb->len);
655 }
656 skb_copy_from_linear_data(skb, inl + 1, hlen);
657 if (shinfo->nr_frags)
658 memcpy(((void *)(inl + 1)) + hlen, fragptr,
659 skb_frag_size(&shinfo->frags[0]));
660
661 } else {
662 inl->byte_count = cpu_to_be32(1 << 31 | spc);
663 if (hlen <= spc) {
664 skb_copy_from_linear_data(skb, inl + 1, hlen);
665 if (hlen < spc) {
666 memcpy(((void *)(inl + 1)) + hlen,
667 fragptr, spc - hlen);
668 fragptr += spc - hlen;
669 }
670 inl = (void *) (inl + 1) + spc;
671 memcpy(((void *)(inl + 1)), fragptr, skb->len - spc);
672 } else {
673 skb_copy_from_linear_data(skb, inl + 1, spc);
674 inl = (void *) (inl + 1) + spc;
675 skb_copy_from_linear_data_offset(skb, spc, inl + 1,
676 hlen - spc);
677 if (shinfo->nr_frags)
678 memcpy(((void *)(inl + 1)) + hlen - spc,
679 fragptr,
680 skb_frag_size(&shinfo->frags[0]));
681 }
682
683 dma_wmb();
684 inl->byte_count = cpu_to_be32(1 << 31 | (skb->len - spc));
685 }
686 }
687
688 u16 mlx4_en_select_queue(struct net_device *dev, struct sk_buff *skb,
689 void *accel_priv, select_queue_fallback_t fallback)
690 {
691 struct mlx4_en_priv *priv = netdev_priv(dev);
692 u16 rings_p_up = priv->num_tx_rings_p_up;
693 u8 up = 0;
694
695 if (dev->num_tc)
696 return skb_tx_hash(dev, skb);
697
698 if (skb_vlan_tag_present(skb))
699 up = skb_vlan_tag_get(skb) >> VLAN_PRIO_SHIFT;
700
701 return fallback(dev, skb) % rings_p_up + up * rings_p_up;
702 }
703
704 static void mlx4_bf_copy(void __iomem *dst, const void *src,
705 unsigned int bytecnt)
706 {
707 __iowrite64_copy(dst, src, bytecnt / 8);
708 }
709
710 netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
711 {
712 struct skb_shared_info *shinfo = skb_shinfo(skb);
713 struct mlx4_en_priv *priv = netdev_priv(dev);
714 struct device *ddev = priv->ddev;
715 struct mlx4_en_tx_ring *ring;
716 struct mlx4_en_tx_desc *tx_desc;
717 struct mlx4_wqe_data_seg *data;
718 struct mlx4_en_tx_info *tx_info;
719 int tx_ind = 0;
720 int nr_txbb;
721 int desc_size;
722 int real_size;
723 u32 index, bf_index;
724 __be32 op_own;
725 u16 vlan_tag = 0;
726 u16 vlan_proto = 0;
727 int i_frag;
728 int lso_header_size;
729 void *fragptr = NULL;
730 bool bounce = false;
731 bool send_doorbell;
732 bool stop_queue;
733 bool inline_ok;
734 u32 ring_cons;
735
736 if (!priv->port_up)
737 goto tx_drop;
738
739 tx_ind = skb_get_queue_mapping(skb);
740 ring = priv->tx_ring[tx_ind];
741
742 /* fetch ring->cons far ahead before needing it to avoid stall */
743 ring_cons = ACCESS_ONCE(ring->cons);
744
745 real_size = get_real_size(skb, shinfo, dev, &lso_header_size,
746 &inline_ok, &fragptr);
747 if (unlikely(!real_size))
748 goto tx_drop;
749
750 /* Align descriptor to TXBB size */
751 desc_size = ALIGN(real_size, TXBB_SIZE);
752 nr_txbb = desc_size / TXBB_SIZE;
753 if (unlikely(nr_txbb > MAX_DESC_TXBBS)) {
754 if (netif_msg_tx_err(priv))
755 en_warn(priv, "Oversized header or SG list\n");
756 goto tx_drop;
757 }
758
759 if (skb_vlan_tag_present(skb)) {
760 vlan_tag = skb_vlan_tag_get(skb);
761 vlan_proto = be16_to_cpu(skb->vlan_proto);
762 }
763
764 netdev_txq_bql_enqueue_prefetchw(ring->tx_queue);
765
766 /* Track current inflight packets for performance analysis */
767 AVG_PERF_COUNTER(priv->pstats.inflight_avg,
768 (u32)(ring->prod - ring_cons - 1));
769
770 /* Packet is good - grab an index and transmit it */
771 index = ring->prod & ring->size_mask;
772 bf_index = ring->prod;
773
774 /* See if we have enough space for whole descriptor TXBB for setting
775 * SW ownership on next descriptor; if not, use a bounce buffer. */
776 if (likely(index + nr_txbb <= ring->size))
777 tx_desc = ring->buf + index * TXBB_SIZE;
778 else {
779 tx_desc = (struct mlx4_en_tx_desc *) ring->bounce_buf;
780 bounce = true;
781 }
782
783 /* Save skb in tx_info ring */
784 tx_info = &ring->tx_info[index];
785 tx_info->skb = skb;
786 tx_info->nr_txbb = nr_txbb;
787
788 data = &tx_desc->data;
789 if (lso_header_size)
790 data = ((void *)&tx_desc->lso + ALIGN(lso_header_size + 4,
791 DS_SIZE));
792
793 /* valid only for none inline segments */
794 tx_info->data_offset = (void *)data - (void *)tx_desc;
795
796 tx_info->inl = inline_ok;
797
798 tx_info->linear = (lso_header_size < skb_headlen(skb) &&
799 !inline_ok) ? 1 : 0;
800
801 tx_info->nr_maps = shinfo->nr_frags + tx_info->linear;
802 data += tx_info->nr_maps - 1;
803
804 if (!tx_info->inl) {
805 dma_addr_t dma = 0;
806 u32 byte_count = 0;
807
808 /* Map fragments if any */
809 for (i_frag = shinfo->nr_frags - 1; i_frag >= 0; i_frag--) {
810 const struct skb_frag_struct *frag;
811
812 frag = &shinfo->frags[i_frag];
813 byte_count = skb_frag_size(frag);
814 dma = skb_frag_dma_map(ddev, frag,
815 0, byte_count,
816 DMA_TO_DEVICE);
817 if (dma_mapping_error(ddev, dma))
818 goto tx_drop_unmap;
819
820 data->addr = cpu_to_be64(dma);
821 data->lkey = ring->mr_key;
822 dma_wmb();
823 data->byte_count = cpu_to_be32(byte_count);
824 --data;
825 }
826
827 /* Map linear part if needed */
828 if (tx_info->linear) {
829 byte_count = skb_headlen(skb) - lso_header_size;
830
831 dma = dma_map_single(ddev, skb->data +
832 lso_header_size, byte_count,
833 PCI_DMA_TODEVICE);
834 if (dma_mapping_error(ddev, dma))
835 goto tx_drop_unmap;
836
837 data->addr = cpu_to_be64(dma);
838 data->lkey = ring->mr_key;
839 dma_wmb();
840 data->byte_count = cpu_to_be32(byte_count);
841 }
842 /* tx completion can avoid cache line miss for common cases */
843 tx_info->map0_dma = dma;
844 tx_info->map0_byte_count = byte_count;
845 }
846
847 /*
848 * For timestamping add flag to skb_shinfo and
849 * set flag for further reference
850 */
851 tx_info->ts_requested = 0;
852 if (unlikely(ring->hwtstamp_tx_type == HWTSTAMP_TX_ON &&
853 shinfo->tx_flags & SKBTX_HW_TSTAMP)) {
854 shinfo->tx_flags |= SKBTX_IN_PROGRESS;
855 tx_info->ts_requested = 1;
856 }
857
858 /* Prepare ctrl segement apart opcode+ownership, which depends on
859 * whether LSO is used */
860 tx_desc->ctrl.srcrb_flags = priv->ctrl_flags;
861 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
862 if (!skb->encapsulation)
863 tx_desc->ctrl.srcrb_flags |= cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM |
864 MLX4_WQE_CTRL_TCP_UDP_CSUM);
865 else
866 tx_desc->ctrl.srcrb_flags |= cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM);
867 ring->tx_csum++;
868 }
869
870 if (priv->flags & MLX4_EN_FLAG_ENABLE_HW_LOOPBACK) {
871 struct ethhdr *ethh;
872
873 /* Copy dst mac address to wqe. This allows loopback in eSwitch,
874 * so that VFs and PF can communicate with each other
875 */
876 ethh = (struct ethhdr *)skb->data;
877 tx_desc->ctrl.srcrb_flags16[0] = get_unaligned((__be16 *)ethh->h_dest);
878 tx_desc->ctrl.imm = get_unaligned((__be32 *)(ethh->h_dest + 2));
879 }
880
881 /* Handle LSO (TSO) packets */
882 if (lso_header_size) {
883 int i;
884
885 /* Mark opcode as LSO */
886 op_own = cpu_to_be32(MLX4_OPCODE_LSO | (1 << 6)) |
887 ((ring->prod & ring->size) ?
888 cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0);
889
890 /* Fill in the LSO prefix */
891 tx_desc->lso.mss_hdr_size = cpu_to_be32(
892 shinfo->gso_size << 16 | lso_header_size);
893
894 /* Copy headers;
895 * note that we already verified that it is linear */
896 memcpy(tx_desc->lso.header, skb->data, lso_header_size);
897
898 ring->tso_packets++;
899
900 i = ((skb->len - lso_header_size) / shinfo->gso_size) +
901 !!((skb->len - lso_header_size) % shinfo->gso_size);
902 tx_info->nr_bytes = skb->len + (i - 1) * lso_header_size;
903 ring->packets += i;
904 } else {
905 /* Normal (Non LSO) packet */
906 op_own = cpu_to_be32(MLX4_OPCODE_SEND) |
907 ((ring->prod & ring->size) ?
908 cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0);
909 tx_info->nr_bytes = max_t(unsigned int, skb->len, ETH_ZLEN);
910 ring->packets++;
911 }
912 ring->bytes += tx_info->nr_bytes;
913 netdev_tx_sent_queue(ring->tx_queue, tx_info->nr_bytes);
914 AVG_PERF_COUNTER(priv->pstats.tx_pktsz_avg, skb->len);
915
916 if (tx_info->inl)
917 build_inline_wqe(tx_desc, skb, shinfo, real_size, &vlan_tag,
918 tx_ind, fragptr);
919
920 if (skb->encapsulation) {
921 struct iphdr *ipv4 = (struct iphdr *)skb_inner_network_header(skb);
922 if (ipv4->protocol == IPPROTO_TCP || ipv4->protocol == IPPROTO_UDP)
923 op_own |= cpu_to_be32(MLX4_WQE_CTRL_IIP | MLX4_WQE_CTRL_ILP);
924 else
925 op_own |= cpu_to_be32(MLX4_WQE_CTRL_IIP);
926 }
927
928 ring->prod += nr_txbb;
929
930 /* If we used a bounce buffer then copy descriptor back into place */
931 if (unlikely(bounce))
932 tx_desc = mlx4_en_bounce_to_desc(priv, ring, index, desc_size);
933
934 skb_tx_timestamp(skb);
935
936 /* Check available TXBBs And 2K spare for prefetch */
937 stop_queue = mlx4_en_is_tx_ring_full(ring);
938 if (unlikely(stop_queue)) {
939 netif_tx_stop_queue(ring->tx_queue);
940 ring->queue_stopped++;
941 }
942 send_doorbell = !skb->xmit_more || netif_xmit_stopped(ring->tx_queue);
943
944 real_size = (real_size / 16) & 0x3f;
945
946 if (ring->bf_enabled && desc_size <= MAX_BF && !bounce &&
947 !skb_vlan_tag_present(skb) && send_doorbell) {
948 tx_desc->ctrl.bf_qpn = ring->doorbell_qpn |
949 cpu_to_be32(real_size);
950
951 op_own |= htonl((bf_index & 0xffff) << 8);
952 /* Ensure new descriptor hits memory
953 * before setting ownership of this descriptor to HW
954 */
955 dma_wmb();
956 tx_desc->ctrl.owner_opcode = op_own;
957
958 wmb();
959
960 mlx4_bf_copy(ring->bf.reg + ring->bf.offset, &tx_desc->ctrl,
961 desc_size);
962
963 wmb();
964
965 ring->bf.offset ^= ring->bf.buf_size;
966 } else {
967 tx_desc->ctrl.vlan_tag = cpu_to_be16(vlan_tag);
968 if (vlan_proto == ETH_P_8021AD)
969 tx_desc->ctrl.ins_vlan = MLX4_WQE_CTRL_INS_SVLAN;
970 else if (vlan_proto == ETH_P_8021Q)
971 tx_desc->ctrl.ins_vlan = MLX4_WQE_CTRL_INS_CVLAN;
972 else
973 tx_desc->ctrl.ins_vlan = 0;
974
975 tx_desc->ctrl.fence_size = real_size;
976
977 /* Ensure new descriptor hits memory
978 * before setting ownership of this descriptor to HW
979 */
980 dma_wmb();
981 tx_desc->ctrl.owner_opcode = op_own;
982 if (send_doorbell) {
983 wmb();
984 /* Since there is no iowrite*_native() that writes the
985 * value as is, without byteswapping - using the one
986 * the doesn't do byteswapping in the relevant arch
987 * endianness.
988 */
989 #if defined(__LITTLE_ENDIAN)
990 iowrite32(
991 #else
992 iowrite32be(
993 #endif
994 ring->doorbell_qpn,
995 ring->bf.uar->map + MLX4_SEND_DOORBELL);
996 } else {
997 ring->xmit_more++;
998 }
999 }
1000
1001 if (unlikely(stop_queue)) {
1002 /* If queue was emptied after the if (stop_queue) , and before
1003 * the netif_tx_stop_queue() - need to wake the queue,
1004 * or else it will remain stopped forever.
1005 * Need a memory barrier to make sure ring->cons was not
1006 * updated before queue was stopped.
1007 */
1008 smp_rmb();
1009
1010 ring_cons = ACCESS_ONCE(ring->cons);
1011 if (unlikely(!mlx4_en_is_tx_ring_full(ring))) {
1012 netif_tx_wake_queue(ring->tx_queue);
1013 ring->wake_queue++;
1014 }
1015 }
1016 return NETDEV_TX_OK;
1017
1018 tx_drop_unmap:
1019 en_err(priv, "DMA mapping error\n");
1020
1021 while (++i_frag < shinfo->nr_frags) {
1022 ++data;
1023 dma_unmap_page(ddev, (dma_addr_t) be64_to_cpu(data->addr),
1024 be32_to_cpu(data->byte_count),
1025 PCI_DMA_TODEVICE);
1026 }
1027
1028 tx_drop:
1029 dev_kfree_skb_any(skb);
1030 priv->stats.tx_dropped++;
1031 return NETDEV_TX_OK;
1032 }
1033
Linux kernel - Deliverables
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