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Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -07001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090036#include <linux/slab.h>
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -070037#include <linux/mlx4/qp.h>
38#include <linux/skbuff.h>
39#include <linux/if_vlan.h>
40#include <linux/vmalloc.h>
Yevgeny Petrilinfa37a952010-08-24 03:46:46 +000041#include <linux/tcp.h>
Or Gerlitz837052d2013-12-23 16:09:44 +020042#include <linux/ip.h>
Paul Gortmaker6eb07ca2011-09-15 19:46:05 -040043#include <linux/moduleparam.h>
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -070044
45#include "mlx4_en.h"
46
47enum {
48 MAX_INLINE = 104, /* 128 - 16 - 4 - 4 */
Yevgeny Petrilin87a5c382011-03-22 22:38:52 +000049 MAX_BF = 256,
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -070050};
51
52static int inline_thold __read_mostly = MAX_INLINE;
53
54module_param_named(inline_thold, inline_thold, int, 0444);
André Goddard Rosaaf901ca2009-11-14 13:09:05 -020055MODULE_PARM_DESC(inline_thold, "threshold for using inline data");
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -070056
57int mlx4_en_create_tx_ring(struct mlx4_en_priv *priv,
Eugenia Emantayev41d942d2013-11-07 12:19:52 +020058 struct mlx4_en_tx_ring **pring, int qpn, u32 size,
Ido Shamayd03a68f2013-12-19 21:20:14 +020059 u16 stride, int node, int queue_index)
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -070060{
61 struct mlx4_en_dev *mdev = priv->mdev;
Eugenia Emantayev41d942d2013-11-07 12:19:52 +020062 struct mlx4_en_tx_ring *ring;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -070063 int tmp;
64 int err;
65
Eugenia Emantayev163561a2013-11-07 12:19:54 +020066 ring = kzalloc_node(sizeof(*ring), GFP_KERNEL, node);
Eugenia Emantayev41d942d2013-11-07 12:19:52 +020067 if (!ring) {
Eugenia Emantayev163561a2013-11-07 12:19:54 +020068 ring = kzalloc(sizeof(*ring), GFP_KERNEL);
69 if (!ring) {
70 en_err(priv, "Failed allocating TX ring\n");
71 return -ENOMEM;
72 }
Eugenia Emantayev41d942d2013-11-07 12:19:52 +020073 }
74
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -070075 ring->size = size;
76 ring->size_mask = size - 1;
77 ring->stride = stride;
78
79 inline_thold = min(inline_thold, MAX_INLINE);
80
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -070081 tmp = size * sizeof(struct mlx4_en_tx_info);
Eugenia Emantayev163561a2013-11-07 12:19:54 +020082 ring->tx_info = vmalloc_node(tmp, node);
Eugenia Emantayev41d942d2013-11-07 12:19:52 +020083 if (!ring->tx_info) {
Eugenia Emantayev163561a2013-11-07 12:19:54 +020084 ring->tx_info = vmalloc(tmp);
85 if (!ring->tx_info) {
86 err = -ENOMEM;
87 goto err_ring;
88 }
Eugenia Emantayev41d942d2013-11-07 12:19:52 +020089 }
Joe Perchese404dec2012-01-29 12:56:23 +000090
Yevgeny Petrilin453a6082009-06-01 20:27:13 +000091 en_dbg(DRV, priv, "Allocated tx_info ring at addr:%p size:%d\n",
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -070092 ring->tx_info, tmp);
93
Eugenia Emantayev163561a2013-11-07 12:19:54 +020094 ring->bounce_buf = kmalloc_node(MAX_DESC_SIZE, GFP_KERNEL, node);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -070095 if (!ring->bounce_buf) {
Eugenia Emantayev163561a2013-11-07 12:19:54 +020096 ring->bounce_buf = kmalloc(MAX_DESC_SIZE, GFP_KERNEL);
97 if (!ring->bounce_buf) {
98 err = -ENOMEM;
99 goto err_info;
100 }
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700101 }
102 ring->buf_size = ALIGN(size * ring->stride, MLX4_EN_PAGE_SIZE);
103
Eugenia Emantayev163561a2013-11-07 12:19:54 +0200104 /* Allocate HW buffers on provided NUMA node */
105 set_dev_node(&mdev->dev->pdev->dev, node);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700106 err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres, ring->buf_size,
107 2 * PAGE_SIZE);
Eugenia Emantayev163561a2013-11-07 12:19:54 +0200108 set_dev_node(&mdev->dev->pdev->dev, mdev->dev->numa_node);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700109 if (err) {
Yevgeny Petrilin453a6082009-06-01 20:27:13 +0000110 en_err(priv, "Failed allocating hwq resources\n");
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700111 goto err_bounce;
112 }
113
114 err = mlx4_en_map_buffer(&ring->wqres.buf);
115 if (err) {
Yevgeny Petrilin453a6082009-06-01 20:27:13 +0000116 en_err(priv, "Failed to map TX buffer\n");
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700117 goto err_hwq_res;
118 }
119
120 ring->buf = ring->wqres.buf.direct.buf;
121
Yevgeny Petrilin453a6082009-06-01 20:27:13 +0000122 en_dbg(DRV, priv, "Allocated TX ring (addr:%p) - buf:%p size:%d "
123 "buf_size:%d dma:%llx\n", ring, ring->buf, ring->size,
124 ring->buf_size, (unsigned long long) ring->wqres.buf.direct.map);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700125
Yevgeny Petrilin87a5c382011-03-22 22:38:52 +0000126 ring->qpn = qpn;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700127 err = mlx4_qp_alloc(mdev->dev, ring->qpn, &ring->qp);
128 if (err) {
Yevgeny Petrilin453a6082009-06-01 20:27:13 +0000129 en_err(priv, "Failed allocating qp %d\n", ring->qpn);
Yevgeny Petrilin87a5c382011-03-22 22:38:52 +0000130 goto err_map;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700131 }
Yevgeny Petrilin966508f2009-04-20 04:30:03 +0000132 ring->qp.event = mlx4_en_sqp_event;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700133
Eugenia Emantayev163561a2013-11-07 12:19:54 +0200134 err = mlx4_bf_alloc(mdev->dev, &ring->bf, node);
Yevgeny Petrilin87a5c382011-03-22 22:38:52 +0000135 if (err) {
136 en_dbg(DRV, priv, "working without blueflame (%d)", err);
137 ring->bf.uar = &mdev->priv_uar;
138 ring->bf.uar->map = mdev->uar_map;
139 ring->bf_enabled = false;
140 } else
141 ring->bf_enabled = true;
142
Amir Vadaiec693d42013-04-23 06:06:49 +0000143 ring->hwtstamp_tx_type = priv->hwtstamp_config.tx_type;
Ido Shamayd03a68f2013-12-19 21:20:14 +0200144 ring->queue_index = queue_index;
145
146 if (queue_index < priv->num_tx_rings_p_up && cpu_online(queue_index))
147 cpumask_set_cpu(queue_index, &ring->affinity_mask);
Amir Vadaiec693d42013-04-23 06:06:49 +0000148
Eugenia Emantayev41d942d2013-11-07 12:19:52 +0200149 *pring = ring;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700150 return 0;
151
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700152err_map:
153 mlx4_en_unmap_buffer(&ring->wqres.buf);
154err_hwq_res:
155 mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
156err_bounce:
157 kfree(ring->bounce_buf);
158 ring->bounce_buf = NULL;
Eugenia Emantayev41d942d2013-11-07 12:19:52 +0200159err_info:
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700160 vfree(ring->tx_info);
161 ring->tx_info = NULL;
Eugenia Emantayev41d942d2013-11-07 12:19:52 +0200162err_ring:
163 kfree(ring);
164 *pring = NULL;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700165 return err;
166}
167
168void mlx4_en_destroy_tx_ring(struct mlx4_en_priv *priv,
Eugenia Emantayev41d942d2013-11-07 12:19:52 +0200169 struct mlx4_en_tx_ring **pring)
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700170{
171 struct mlx4_en_dev *mdev = priv->mdev;
Eugenia Emantayev41d942d2013-11-07 12:19:52 +0200172 struct mlx4_en_tx_ring *ring = *pring;
Yevgeny Petrilin453a6082009-06-01 20:27:13 +0000173 en_dbg(DRV, priv, "Destroying tx ring, qpn: %d\n", ring->qpn);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700174
Yevgeny Petrilin87a5c382011-03-22 22:38:52 +0000175 if (ring->bf_enabled)
176 mlx4_bf_free(mdev->dev, &ring->bf);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700177 mlx4_qp_remove(mdev->dev, &ring->qp);
178 mlx4_qp_free(mdev->dev, &ring->qp);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700179 mlx4_en_unmap_buffer(&ring->wqres.buf);
180 mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
181 kfree(ring->bounce_buf);
182 ring->bounce_buf = NULL;
183 vfree(ring->tx_info);
184 ring->tx_info = NULL;
Eugenia Emantayev41d942d2013-11-07 12:19:52 +0200185 kfree(ring);
186 *pring = NULL;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700187}
188
189int mlx4_en_activate_tx_ring(struct mlx4_en_priv *priv,
190 struct mlx4_en_tx_ring *ring,
Amir Vadai0e98b522012-04-04 21:33:24 +0000191 int cq, int user_prio)
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700192{
193 struct mlx4_en_dev *mdev = priv->mdev;
194 int err;
195
196 ring->cqn = cq;
197 ring->prod = 0;
198 ring->cons = 0xffffffff;
199 ring->last_nr_txbb = 1;
200 ring->poll_cnt = 0;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700201 memset(ring->tx_info, 0, ring->size * sizeof(struct mlx4_en_tx_info));
202 memset(ring->buf, 0, ring->buf_size);
203
204 ring->qp_state = MLX4_QP_STATE_RST;
David S. Miller1805b2f2011-10-24 18:18:09 -0400205 ring->doorbell_qpn = ring->qp.qpn << 8;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700206
207 mlx4_en_fill_qp_context(priv, ring->size, ring->stride, 1, 0, ring->qpn,
Amir Vadai0e98b522012-04-04 21:33:24 +0000208 ring->cqn, user_prio, &ring->context);
Yevgeny Petrilin87a5c382011-03-22 22:38:52 +0000209 if (ring->bf_enabled)
210 ring->context.usr_page = cpu_to_be32(ring->bf.uar->index);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700211
212 err = mlx4_qp_to_ready(mdev->dev, &ring->wqres.mtt, &ring->context,
213 &ring->qp, &ring->qp_state);
Ido Shamayd03a68f2013-12-19 21:20:14 +0200214 if (!user_prio && cpu_online(ring->queue_index))
215 netif_set_xps_queue(priv->dev, &ring->affinity_mask,
216 ring->queue_index);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700217
218 return err;
219}
220
221void mlx4_en_deactivate_tx_ring(struct mlx4_en_priv *priv,
222 struct mlx4_en_tx_ring *ring)
223{
224 struct mlx4_en_dev *mdev = priv->mdev;
225
226 mlx4_qp_modify(mdev->dev, NULL, ring->qp_state,
227 MLX4_QP_STATE_RST, NULL, 0, 0, &ring->qp);
228}
229
Eugenia Emantayev2d4b6462013-07-25 19:21:23 +0300230static void mlx4_en_stamp_wqe(struct mlx4_en_priv *priv,
231 struct mlx4_en_tx_ring *ring, int index,
232 u8 owner)
233{
234 __be32 stamp = cpu_to_be32(STAMP_VAL | (!!owner << STAMP_SHIFT));
235 struct mlx4_en_tx_desc *tx_desc = ring->buf + index * TXBB_SIZE;
236 struct mlx4_en_tx_info *tx_info = &ring->tx_info[index];
237 void *end = ring->buf + ring->buf_size;
238 __be32 *ptr = (__be32 *)tx_desc;
239 int i;
240
241 /* Optimize the common case when there are no wraparounds */
242 if (likely((void *)tx_desc + tx_info->nr_txbb * TXBB_SIZE <= end)) {
243 /* Stamp the freed descriptor */
244 for (i = 0; i < tx_info->nr_txbb * TXBB_SIZE;
245 i += STAMP_STRIDE) {
246 *ptr = stamp;
247 ptr += STAMP_DWORDS;
248 }
249 } else {
250 /* Stamp the freed descriptor */
251 for (i = 0; i < tx_info->nr_txbb * TXBB_SIZE;
252 i += STAMP_STRIDE) {
253 *ptr = stamp;
254 ptr += STAMP_DWORDS;
255 if ((void *)ptr >= end) {
256 ptr = ring->buf;
257 stamp ^= cpu_to_be32(0x80000000);
258 }
259 }
260 }
261}
262
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700263
264static u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv,
265 struct mlx4_en_tx_ring *ring,
Amir Vadaiec693d42013-04-23 06:06:49 +0000266 int index, u8 owner, u64 timestamp)
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700267{
Amir Vadaiec693d42013-04-23 06:06:49 +0000268 struct mlx4_en_dev *mdev = priv->mdev;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700269 struct mlx4_en_tx_info *tx_info = &ring->tx_info[index];
270 struct mlx4_en_tx_desc *tx_desc = ring->buf + index * TXBB_SIZE;
271 struct mlx4_wqe_data_seg *data = (void *) tx_desc + tx_info->data_offset;
272 struct sk_buff *skb = tx_info->skb;
273 struct skb_frag_struct *frag;
274 void *end = ring->buf + ring->buf_size;
275 int frags = skb_shinfo(skb)->nr_frags;
276 int i;
Amir Vadaiec693d42013-04-23 06:06:49 +0000277 struct skb_shared_hwtstamps hwts;
278
279 if (timestamp) {
280 mlx4_en_fill_hwtstamps(mdev, &hwts, timestamp);
281 skb_tstamp_tx(skb, &hwts);
282 }
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700283
284 /* Optimize the common case when there are no wraparounds */
285 if (likely((void *) tx_desc + tx_info->nr_txbb * TXBB_SIZE <= end)) {
Yevgeny Petrilin41efea52009-01-08 10:57:15 -0800286 if (!tx_info->inl) {
287 if (tx_info->linear) {
Yevgeny Petrilinebf8c9a2012-03-06 04:03:34 +0000288 dma_unmap_single(priv->ddev,
Yevgeny Petrilin41efea52009-01-08 10:57:15 -0800289 (dma_addr_t) be64_to_cpu(data->addr),
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700290 be32_to_cpu(data->byte_count),
291 PCI_DMA_TODEVICE);
Yevgeny Petrilin41efea52009-01-08 10:57:15 -0800292 ++data;
293 }
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700294
Yevgeny Petrilin41efea52009-01-08 10:57:15 -0800295 for (i = 0; i < frags; i++) {
296 frag = &skb_shinfo(skb)->frags[i];
Yevgeny Petrilinebf8c9a2012-03-06 04:03:34 +0000297 dma_unmap_page(priv->ddev,
Yevgeny Petrilin41efea52009-01-08 10:57:15 -0800298 (dma_addr_t) be64_to_cpu(data[i].addr),
Eric Dumazet9e903e02011-10-18 21:00:24 +0000299 skb_frag_size(frag), PCI_DMA_TODEVICE);
Yevgeny Petrilin41efea52009-01-08 10:57:15 -0800300 }
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700301 }
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700302 } else {
Yevgeny Petrilin41efea52009-01-08 10:57:15 -0800303 if (!tx_info->inl) {
304 if ((void *) data >= end) {
Joe Perches43d620c2011-06-16 19:08:06 +0000305 data = ring->buf + ((void *)data - end);
Yevgeny Petrilin41efea52009-01-08 10:57:15 -0800306 }
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700307
Yevgeny Petrilin41efea52009-01-08 10:57:15 -0800308 if (tx_info->linear) {
Yevgeny Petrilinebf8c9a2012-03-06 04:03:34 +0000309 dma_unmap_single(priv->ddev,
Yevgeny Petrilin41efea52009-01-08 10:57:15 -0800310 (dma_addr_t) be64_to_cpu(data->addr),
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700311 be32_to_cpu(data->byte_count),
312 PCI_DMA_TODEVICE);
Yevgeny Petrilin41efea52009-01-08 10:57:15 -0800313 ++data;
314 }
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700315
Yevgeny Petrilin41efea52009-01-08 10:57:15 -0800316 for (i = 0; i < frags; i++) {
317 /* Check for wraparound before unmapping */
318 if ((void *) data >= end)
Joe Perches43d620c2011-06-16 19:08:06 +0000319 data = ring->buf;
Yevgeny Petrilin41efea52009-01-08 10:57:15 -0800320 frag = &skb_shinfo(skb)->frags[i];
Yevgeny Petrilinebf8c9a2012-03-06 04:03:34 +0000321 dma_unmap_page(priv->ddev,
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700322 (dma_addr_t) be64_to_cpu(data->addr),
Eric Dumazet9e903e02011-10-18 21:00:24 +0000323 skb_frag_size(frag), PCI_DMA_TODEVICE);
Yevgeny Petrilineb4ad822009-08-02 20:22:18 -0700324 ++data;
Yevgeny Petrilin41efea52009-01-08 10:57:15 -0800325 }
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700326 }
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700327 }
Eugenia Emantayev0276a332013-12-19 21:20:17 +0200328 dev_kfree_skb(skb);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700329 return tx_info->nr_txbb;
330}
331
332
333int mlx4_en_free_tx_buf(struct net_device *dev, struct mlx4_en_tx_ring *ring)
334{
335 struct mlx4_en_priv *priv = netdev_priv(dev);
336 int cnt = 0;
337
338 /* Skip last polled descriptor */
339 ring->cons += ring->last_nr_txbb;
Yevgeny Petrilin453a6082009-06-01 20:27:13 +0000340 en_dbg(DRV, priv, "Freeing Tx buf - cons:0x%x prod:0x%x\n",
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700341 ring->cons, ring->prod);
342
343 if ((u32) (ring->prod - ring->cons) > ring->size) {
344 if (netif_msg_tx_err(priv))
Yevgeny Petrilin453a6082009-06-01 20:27:13 +0000345 en_warn(priv, "Tx consumer passed producer!\n");
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700346 return 0;
347 }
348
349 while (ring->cons != ring->prod) {
350 ring->last_nr_txbb = mlx4_en_free_tx_desc(priv, ring,
351 ring->cons & ring->size_mask,
Amir Vadaiec693d42013-04-23 06:06:49 +0000352 !!(ring->cons & ring->size), 0);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700353 ring->cons += ring->last_nr_txbb;
354 cnt++;
355 }
356
Tom Herbert41b74922013-02-06 07:58:41 +0000357 netdev_tx_reset_queue(ring->tx_queue);
358
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700359 if (cnt)
Yevgeny Petrilin453a6082009-06-01 20:27:13 +0000360 en_dbg(DRV, priv, "Freed %d uncompleted tx descriptors\n", cnt);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700361
362 return cnt;
363}
364
Eugenia Emantayev0276a332013-12-19 21:20:17 +0200365static int mlx4_en_process_tx_cq(struct net_device *dev,
366 struct mlx4_en_cq *cq,
367 int budget)
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700368{
369 struct mlx4_en_priv *priv = netdev_priv(dev);
370 struct mlx4_cq *mcq = &cq->mcq;
Eugenia Emantayev41d942d2013-11-07 12:19:52 +0200371 struct mlx4_en_tx_ring *ring = priv->tx_ring[cq->ring];
Yevgeny Petrilinf0ab34f2011-11-26 19:55:10 +0000372 struct mlx4_cqe *cqe;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700373 u16 index;
Eugenia Emantayev2d4b6462013-07-25 19:21:23 +0300374 u16 new_index, ring_index, stamp_index;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700375 u32 txbbs_skipped = 0;
Eugenia Emantayev2d4b6462013-07-25 19:21:23 +0300376 u32 txbbs_stamp = 0;
Yevgeny Petrilinf0ab34f2011-11-26 19:55:10 +0000377 u32 cons_index = mcq->cons_index;
378 int size = cq->size;
379 u32 size_mask = ring->size_mask;
380 struct mlx4_cqe *buf = cq->buf;
Yevgeny Petrilin5b263f52012-04-23 02:18:50 +0000381 u32 packets = 0;
382 u32 bytes = 0;
Or Gerlitz08ff3232012-10-21 14:59:24 +0000383 int factor = priv->cqe_factor;
Amir Vadaiec693d42013-04-23 06:06:49 +0000384 u64 timestamp = 0;
Eugenia Emantayev0276a332013-12-19 21:20:17 +0200385 int done = 0;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700386
387 if (!priv->port_up)
Eugenia Emantayev0276a332013-12-19 21:20:17 +0200388 return 0;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700389
Yevgeny Petrilinf0ab34f2011-11-26 19:55:10 +0000390 index = cons_index & size_mask;
Or Gerlitz08ff3232012-10-21 14:59:24 +0000391 cqe = &buf[(index << factor) + factor];
Yevgeny Petrilinf0ab34f2011-11-26 19:55:10 +0000392 ring_index = ring->cons & size_mask;
Eugenia Emantayev2d4b6462013-07-25 19:21:23 +0300393 stamp_index = ring_index;
Yevgeny Petrilinf0ab34f2011-11-26 19:55:10 +0000394
395 /* Process all completed CQEs */
396 while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
Eugenia Emantayev0276a332013-12-19 21:20:17 +0200397 cons_index & size) && (done < budget)) {
Yevgeny Petrilinf0ab34f2011-11-26 19:55:10 +0000398 /*
399 * make sure we read the CQE after we read the
400 * ownership bit
401 */
402 rmb();
403
Amir Vadaibd2f6312013-08-21 10:08:57 +0300404 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
405 MLX4_CQE_OPCODE_ERROR)) {
406 struct mlx4_err_cqe *cqe_err = (struct mlx4_err_cqe *)cqe;
407
408 en_err(priv, "CQE error - vendor syndrome: 0x%x syndrome: 0x%x\n",
409 cqe_err->vendor_err_syndrome,
410 cqe_err->syndrome);
411 }
412
Yevgeny Petrilinf0ab34f2011-11-26 19:55:10 +0000413 /* Skip over last polled CQE */
414 new_index = be16_to_cpu(cqe->wqe_index) & size_mask;
415
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700416 do {
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700417 txbbs_skipped += ring->last_nr_txbb;
Yevgeny Petrilinf0ab34f2011-11-26 19:55:10 +0000418 ring_index = (ring_index + ring->last_nr_txbb) & size_mask;
Amir Vadaiec693d42013-04-23 06:06:49 +0000419 if (ring->tx_info[ring_index].ts_requested)
420 timestamp = mlx4_en_get_cqe_ts(cqe);
421
Yevgeny Petrilinf0ab34f2011-11-26 19:55:10 +0000422 /* free next descriptor */
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700423 ring->last_nr_txbb = mlx4_en_free_tx_desc(
Yevgeny Petrilinf0ab34f2011-11-26 19:55:10 +0000424 priv, ring, ring_index,
425 !!((ring->cons + txbbs_skipped) &
Amir Vadaiec693d42013-04-23 06:06:49 +0000426 ring->size), timestamp);
Eugenia Emantayev2d4b6462013-07-25 19:21:23 +0300427
428 mlx4_en_stamp_wqe(priv, ring, stamp_index,
429 !!((ring->cons + txbbs_stamp) &
430 ring->size));
431 stamp_index = ring_index;
432 txbbs_stamp = txbbs_skipped;
Yevgeny Petrilin5b263f52012-04-23 02:18:50 +0000433 packets++;
434 bytes += ring->tx_info[ring_index].nr_bytes;
Eugenia Emantayev0276a332013-12-19 21:20:17 +0200435 } while ((++done < budget) && (ring_index != new_index));
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700436
Yevgeny Petrilinf0ab34f2011-11-26 19:55:10 +0000437 ++cons_index;
438 index = cons_index & size_mask;
Or Gerlitz08ff3232012-10-21 14:59:24 +0000439 cqe = &buf[(index << factor) + factor];
Yevgeny Petrilinf0ab34f2011-11-26 19:55:10 +0000440 }
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700441
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700442
443 /*
444 * To prevent CQ overflow we first update CQ consumer and only then
445 * the ring consumer.
446 */
Yevgeny Petrilinf0ab34f2011-11-26 19:55:10 +0000447 mcq->cons_index = cons_index;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700448 mlx4_cq_set_ci(mcq);
449 wmb();
450 ring->cons += txbbs_skipped;
Yevgeny Petrilin5b263f52012-04-23 02:18:50 +0000451 netdev_tx_completed_queue(ring->tx_queue, packets, bytes);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700452
Yevgeny Petrilinc18520b2012-08-03 00:38:37 +0000453 /*
454 * Wakeup Tx queue if this stopped, and at least 1 packet
455 * was completed
456 */
457 if (netif_tx_queue_stopped(ring->tx_queue) && txbbs_skipped > 0) {
458 netif_tx_wake_queue(ring->tx_queue);
459 priv->port_stats.wake_queue++;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700460 }
Eugenia Emantayev0276a332013-12-19 21:20:17 +0200461 return done;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700462}
463
464void mlx4_en_tx_irq(struct mlx4_cq *mcq)
465{
466 struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
467 struct mlx4_en_priv *priv = netdev_priv(cq->dev);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700468
Eugenia Emantayev0276a332013-12-19 21:20:17 +0200469 if (priv->port_up)
470 napi_schedule(&cq->napi);
471 else
472 mlx4_en_arm_cq(priv, cq);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700473}
474
Eugenia Emantayev0276a332013-12-19 21:20:17 +0200475/* TX CQ polling - called by NAPI */
476int mlx4_en_poll_tx_cq(struct napi_struct *napi, int budget)
477{
478 struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
479 struct net_device *dev = cq->dev;
480 struct mlx4_en_priv *priv = netdev_priv(dev);
481 int done;
482
483 done = mlx4_en_process_tx_cq(dev, cq, budget);
484
485 /* If we used up all the quota - we're probably not done yet... */
486 if (done < budget) {
487 /* Done for now */
488 napi_complete(napi);
489 mlx4_en_arm_cq(priv, cq);
490 return done;
491 }
492 return budget;
493}
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700494
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700495static struct mlx4_en_tx_desc *mlx4_en_bounce_to_desc(struct mlx4_en_priv *priv,
496 struct mlx4_en_tx_ring *ring,
497 u32 index,
498 unsigned int desc_size)
499{
500 u32 copy = (ring->size - index) * TXBB_SIZE;
501 int i;
502
503 for (i = desc_size - copy - 4; i >= 0; i -= 4) {
504 if ((i & (TXBB_SIZE - 1)) == 0)
505 wmb();
506
507 *((u32 *) (ring->buf + i)) =
508 *((u32 *) (ring->bounce_buf + copy + i));
509 }
510
511 for (i = copy - 4; i >= 4 ; i -= 4) {
512 if ((i & (TXBB_SIZE - 1)) == 0)
513 wmb();
514
515 *((u32 *) (ring->buf + index * TXBB_SIZE + i)) =
516 *((u32 *) (ring->bounce_buf + i));
517 }
518
519 /* Return real descriptor location */
520 return ring->buf + index * TXBB_SIZE;
521}
522
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700523static int is_inline(struct sk_buff *skb, void **pfrag)
524{
525 void *ptr;
526
527 if (inline_thold && !skb_is_gso(skb) && skb->len <= inline_thold) {
528 if (skb_shinfo(skb)->nr_frags == 1) {
Ian Campbell311761c2011-10-19 23:01:45 +0000529 ptr = skb_frag_address_safe(&skb_shinfo(skb)->frags[0]);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700530 if (unlikely(!ptr))
531 return 0;
532
533 if (pfrag)
534 *pfrag = ptr;
535
536 return 1;
537 } else if (unlikely(skb_shinfo(skb)->nr_frags))
538 return 0;
539 else
540 return 1;
541 }
542
543 return 0;
544}
545
546static int inline_size(struct sk_buff *skb)
547{
548 if (skb->len + CTRL_SIZE + sizeof(struct mlx4_wqe_inline_seg)
549 <= MLX4_INLINE_ALIGN)
550 return ALIGN(skb->len + CTRL_SIZE +
551 sizeof(struct mlx4_wqe_inline_seg), 16);
552 else
553 return ALIGN(skb->len + CTRL_SIZE + 2 *
554 sizeof(struct mlx4_wqe_inline_seg), 16);
555}
556
557static int get_real_size(struct sk_buff *skb, struct net_device *dev,
558 int *lso_header_size)
559{
560 struct mlx4_en_priv *priv = netdev_priv(dev);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700561 int real_size;
562
563 if (skb_is_gso(skb)) {
Or Gerlitz837052d2013-12-23 16:09:44 +0200564 if (skb->encapsulation)
565 *lso_header_size = (skb_inner_transport_header(skb) - skb->data) + inner_tcp_hdrlen(skb);
566 else
567 *lso_header_size = skb_transport_offset(skb) + tcp_hdrlen(skb);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700568 real_size = CTRL_SIZE + skb_shinfo(skb)->nr_frags * DS_SIZE +
569 ALIGN(*lso_header_size + 4, DS_SIZE);
570 if (unlikely(*lso_header_size != skb_headlen(skb))) {
571 /* We add a segment for the skb linear buffer only if
572 * it contains data */
573 if (*lso_header_size < skb_headlen(skb))
574 real_size += DS_SIZE;
575 else {
576 if (netif_msg_tx_err(priv))
Yevgeny Petrilin453a6082009-06-01 20:27:13 +0000577 en_warn(priv, "Non-linear headers\n");
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700578 return 0;
579 }
580 }
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700581 } else {
582 *lso_header_size = 0;
583 if (!is_inline(skb, NULL))
584 real_size = CTRL_SIZE + (skb_shinfo(skb)->nr_frags + 1) * DS_SIZE;
585 else
586 real_size = inline_size(skb);
587 }
588
589 return real_size;
590}
591
592static void build_inline_wqe(struct mlx4_en_tx_desc *tx_desc, struct sk_buff *skb,
593 int real_size, u16 *vlan_tag, int tx_ind, void *fragptr)
594{
595 struct mlx4_wqe_inline_seg *inl = &tx_desc->inl;
596 int spc = MLX4_INLINE_ALIGN - CTRL_SIZE - sizeof *inl;
597
598 if (skb->len <= spc) {
599 inl->byte_count = cpu_to_be32(1 << 31 | skb->len);
600 skb_copy_from_linear_data(skb, inl + 1, skb_headlen(skb));
601 if (skb_shinfo(skb)->nr_frags)
602 memcpy(((void *)(inl + 1)) + skb_headlen(skb), fragptr,
Eric Dumazet9e903e02011-10-18 21:00:24 +0000603 skb_frag_size(&skb_shinfo(skb)->frags[0]));
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700604
605 } else {
606 inl->byte_count = cpu_to_be32(1 << 31 | spc);
607 if (skb_headlen(skb) <= spc) {
608 skb_copy_from_linear_data(skb, inl + 1, skb_headlen(skb));
609 if (skb_headlen(skb) < spc) {
610 memcpy(((void *)(inl + 1)) + skb_headlen(skb),
611 fragptr, spc - skb_headlen(skb));
612 fragptr += spc - skb_headlen(skb);
613 }
614 inl = (void *) (inl + 1) + spc;
615 memcpy(((void *)(inl + 1)), fragptr, skb->len - spc);
616 } else {
617 skb_copy_from_linear_data(skb, inl + 1, spc);
618 inl = (void *) (inl + 1) + spc;
619 skb_copy_from_linear_data_offset(skb, spc, inl + 1,
620 skb_headlen(skb) - spc);
621 if (skb_shinfo(skb)->nr_frags)
622 memcpy(((void *)(inl + 1)) + skb_headlen(skb) - spc,
Eric Dumazet9e903e02011-10-18 21:00:24 +0000623 fragptr, skb_frag_size(&skb_shinfo(skb)->frags[0]));
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700624 }
625
626 wmb();
627 inl->byte_count = cpu_to_be32(1 << 31 | (skb->len - spc));
628 }
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700629}
630
Jason Wangf663dd92014-01-10 16:18:26 +0800631u16 mlx4_en_select_queue(struct net_device *dev, struct sk_buff *skb,
632 void *accel_priv)
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700633{
Amir Vadaibc6a4742012-05-17 00:58:10 +0000634 struct mlx4_en_priv *priv = netdev_priv(dev);
Amir Vadaid3179662012-12-02 03:49:23 +0000635 u16 rings_p_up = priv->num_tx_rings_p_up;
Amir Vadaibc6a4742012-05-17 00:58:10 +0000636 u8 up = 0;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700637
Amir Vadaibc6a4742012-05-17 00:58:10 +0000638 if (dev->num_tc)
639 return skb_tx_hash(dev, skb);
Yevgeny Petrilinf813cad2009-06-01 23:24:07 +0000640
Amir Vadaibc6a4742012-05-17 00:58:10 +0000641 if (vlan_tx_tag_present(skb))
642 up = vlan_tx_tag_get(skb) >> VLAN_PRIO_SHIFT;
643
govindarajulu.vc08355f2013-06-03 08:07:42 +0000644 return __netdev_pick_tx(dev, skb) % rings_p_up + up * rings_p_up;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700645}
646
Or Gerlitz966684d2012-03-06 04:04:02 +0000647static void mlx4_bf_copy(void __iomem *dst, unsigned long *src, unsigned bytecnt)
Yevgeny Petrilin87a5c382011-03-22 22:38:52 +0000648{
649 __iowrite64_copy(dst, src, bytecnt / 8);
650}
651
Stephen Hemminger613573252009-08-31 19:50:58 +0000652netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700653{
654 struct mlx4_en_priv *priv = netdev_priv(dev);
655 struct mlx4_en_dev *mdev = priv->mdev;
Amir Vadai237a3a32013-08-21 10:08:58 +0300656 struct device *ddev = priv->ddev;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700657 struct mlx4_en_tx_ring *ring;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700658 struct mlx4_en_tx_desc *tx_desc;
659 struct mlx4_wqe_data_seg *data;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700660 struct mlx4_en_tx_info *tx_info;
661 int tx_ind = 0;
662 int nr_txbb;
663 int desc_size;
664 int real_size;
Yevgeny Petrilin87a5c382011-03-22 22:38:52 +0000665 u32 index, bf_index;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700666 __be32 op_own;
Yevgeny Petrilinf813cad2009-06-01 23:24:07 +0000667 u16 vlan_tag = 0;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700668 int i;
669 int lso_header_size;
670 void *fragptr;
Yevgeny Petrilin87a5c382011-03-22 22:38:52 +0000671 bool bounce = false;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700672
Yevgeny Petrilin3005ad42010-08-24 03:46:07 +0000673 if (!priv->port_up)
674 goto tx_drop;
675
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700676 real_size = get_real_size(skb, dev, &lso_header_size);
677 if (unlikely(!real_size))
Yevgeny Petrilin7e230912009-06-20 22:15:31 +0000678 goto tx_drop;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700679
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300680 /* Align descriptor to TXBB size */
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700681 desc_size = ALIGN(real_size, TXBB_SIZE);
682 nr_txbb = desc_size / TXBB_SIZE;
683 if (unlikely(nr_txbb > MAX_DESC_TXBBS)) {
684 if (netif_msg_tx_err(priv))
Yevgeny Petrilin453a6082009-06-01 20:27:13 +0000685 en_warn(priv, "Oversized header or SG list\n");
Yevgeny Petrilin7e230912009-06-20 22:15:31 +0000686 goto tx_drop;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700687 }
688
Yevgeny Petrilinf813cad2009-06-01 23:24:07 +0000689 tx_ind = skb->queue_mapping;
Eugenia Emantayev41d942d2013-11-07 12:19:52 +0200690 ring = priv->tx_ring[tx_ind];
Jesse Grosseab6d182010-10-20 13:56:03 +0000691 if (vlan_tx_tag_present(skb))
Yevgeny Petrilinf813cad2009-06-01 23:24:07 +0000692 vlan_tag = vlan_tx_tag_get(skb);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700693
694 /* Check available TXBBs And 2K spare for prefetch */
695 if (unlikely(((int)(ring->prod - ring->cons)) >
696 ring->size - HEADROOM - MAX_DESC_TXBBS)) {
Yevgeny Petrilinf813cad2009-06-01 23:24:07 +0000697 /* every full Tx ring stops queue */
Yevgeny Petrilin5b263f52012-04-23 02:18:50 +0000698 netif_tx_stop_queue(ring->tx_queue);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700699 priv->port_stats.queue_stopped++;
700
Amir Vadai72259222013-01-24 01:54:18 +0000701 /* If queue was emptied after the if, and before the
702 * stop_queue - need to wake the queue, or else it will remain
703 * stopped forever.
704 * Need a memory barrier to make sure ring->cons was not
705 * updated before queue was stopped.
706 */
707 wmb();
708
709 if (unlikely(((int)(ring->prod - ring->cons)) <=
710 ring->size - HEADROOM - MAX_DESC_TXBBS)) {
711 netif_tx_wake_queue(ring->tx_queue);
712 priv->port_stats.wake_queue++;
713 } else {
714 return NETDEV_TX_BUSY;
715 }
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700716 }
717
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700718 /* Track current inflight packets for performance analysis */
719 AVG_PERF_COUNTER(priv->pstats.inflight_avg,
720 (u32) (ring->prod - ring->cons - 1));
721
722 /* Packet is good - grab an index and transmit it */
723 index = ring->prod & ring->size_mask;
Yevgeny Petrilin87a5c382011-03-22 22:38:52 +0000724 bf_index = ring->prod;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700725
726 /* See if we have enough space for whole descriptor TXBB for setting
727 * SW ownership on next descriptor; if not, use a bounce buffer. */
728 if (likely(index + nr_txbb <= ring->size))
729 tx_desc = ring->buf + index * TXBB_SIZE;
Yevgeny Petrilin87a5c382011-03-22 22:38:52 +0000730 else {
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700731 tx_desc = (struct mlx4_en_tx_desc *) ring->bounce_buf;
Yevgeny Petrilin87a5c382011-03-22 22:38:52 +0000732 bounce = true;
733 }
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700734
735 /* Save skb in tx_info ring */
736 tx_info = &ring->tx_info[index];
737 tx_info->skb = skb;
738 tx_info->nr_txbb = nr_txbb;
739
Amir Vadai237a3a32013-08-21 10:08:58 +0300740 if (lso_header_size)
741 data = ((void *)&tx_desc->lso + ALIGN(lso_header_size + 4,
742 DS_SIZE));
743 else
744 data = &tx_desc->data;
745
746 /* valid only for none inline segments */
747 tx_info->data_offset = (void *)data - (void *)tx_desc;
748
749 tx_info->linear = (lso_header_size < skb_headlen(skb) &&
750 !is_inline(skb, NULL)) ? 1 : 0;
751
752 data += skb_shinfo(skb)->nr_frags + tx_info->linear - 1;
753
754 if (is_inline(skb, &fragptr)) {
755 tx_info->inl = 1;
756 } else {
757 /* Map fragments */
758 for (i = skb_shinfo(skb)->nr_frags - 1; i >= 0; i--) {
Amir Vadai5f1cd202013-08-21 10:08:59 +0300759 struct skb_frag_struct *frag;
760 dma_addr_t dma;
761
Amir Vadai237a3a32013-08-21 10:08:58 +0300762 frag = &skb_shinfo(skb)->frags[i];
763 dma = skb_frag_dma_map(ddev, frag,
764 0, skb_frag_size(frag),
765 DMA_TO_DEVICE);
766 if (dma_mapping_error(ddev, dma))
767 goto tx_drop_unmap;
768
769 data->addr = cpu_to_be64(dma);
770 data->lkey = cpu_to_be32(mdev->mr.key);
771 wmb();
772 data->byte_count = cpu_to_be32(skb_frag_size(frag));
773 --data;
774 }
775
776 /* Map linear part */
777 if (tx_info->linear) {
778 u32 byte_count = skb_headlen(skb) - lso_header_size;
Amir Vadai5f1cd202013-08-21 10:08:59 +0300779 dma_addr_t dma;
780
Amir Vadai237a3a32013-08-21 10:08:58 +0300781 dma = dma_map_single(ddev, skb->data +
782 lso_header_size, byte_count,
783 PCI_DMA_TODEVICE);
784 if (dma_mapping_error(ddev, dma))
785 goto tx_drop_unmap;
786
787 data->addr = cpu_to_be64(dma);
788 data->lkey = cpu_to_be32(mdev->mr.key);
789 wmb();
790 data->byte_count = cpu_to_be32(byte_count);
791 }
792 tx_info->inl = 0;
793 }
794
Amir Vadaiec693d42013-04-23 06:06:49 +0000795 /*
796 * For timestamping add flag to skb_shinfo and
797 * set flag for further reference
798 */
799 if (ring->hwtstamp_tx_type == HWTSTAMP_TX_ON &&
800 skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) {
801 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
802 tx_info->ts_requested = 1;
803 }
804
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700805 /* Prepare ctrl segement apart opcode+ownership, which depends on
806 * whether LSO is used */
807 tx_desc->ctrl.vlan_tag = cpu_to_be16(vlan_tag);
Amir Vadaic140d762011-11-26 19:55:23 +0000808 tx_desc->ctrl.ins_vlan = MLX4_WQE_CTRL_INS_VLAN *
809 !!vlan_tx_tag_present(skb);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700810 tx_desc->ctrl.fence_size = (real_size / 16) & 0x3f;
Amir Vadai60d6fe92011-11-26 19:55:19 +0000811 tx_desc->ctrl.srcrb_flags = priv->ctrl_flags;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700812 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
813 tx_desc->ctrl.srcrb_flags |= cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM |
814 MLX4_WQE_CTRL_TCP_UDP_CSUM);
Yevgeny Petrilinad043782011-10-18 01:50:56 +0000815 ring->tx_csum++;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700816 }
817
Yan Burman79aeacc2013-02-07 02:25:19 +0000818 if (priv->flags & MLX4_EN_FLAG_ENABLE_HW_LOOPBACK) {
Amir Vadai5f1cd202013-08-21 10:08:59 +0300819 struct ethhdr *ethh;
820
Yan Burman213815a2013-01-17 05:30:42 +0000821 /* Copy dst mac address to wqe. This allows loopback in eSwitch,
822 * so that VFs and PF can communicate with each other
823 */
824 ethh = (struct ethhdr *)skb->data;
825 tx_desc->ctrl.srcrb_flags16[0] = get_unaligned((__be16 *)ethh->h_dest);
826 tx_desc->ctrl.imm = get_unaligned((__be32 *)(ethh->h_dest + 2));
827 }
828
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700829 /* Handle LSO (TSO) packets */
830 if (lso_header_size) {
831 /* Mark opcode as LSO */
832 op_own = cpu_to_be32(MLX4_OPCODE_LSO | (1 << 6)) |
833 ((ring->prod & ring->size) ?
834 cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0);
835
836 /* Fill in the LSO prefix */
837 tx_desc->lso.mss_hdr_size = cpu_to_be32(
838 skb_shinfo(skb)->gso_size << 16 | lso_header_size);
839
840 /* Copy headers;
841 * note that we already verified that it is linear */
842 memcpy(tx_desc->lso.header, skb->data, lso_header_size);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700843
844 priv->port_stats.tso_packets++;
845 i = ((skb->len - lso_header_size) / skb_shinfo(skb)->gso_size) +
846 !!((skb->len - lso_header_size) % skb_shinfo(skb)->gso_size);
Yevgeny Petrilin5b263f52012-04-23 02:18:50 +0000847 tx_info->nr_bytes = skb->len + (i - 1) * lso_header_size;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700848 ring->packets += i;
849 } else {
850 /* Normal (Non LSO) packet */
851 op_own = cpu_to_be32(MLX4_OPCODE_SEND) |
852 ((ring->prod & ring->size) ?
853 cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0);
Yevgeny Petrilin5b263f52012-04-23 02:18:50 +0000854 tx_info->nr_bytes = max_t(unsigned int, skb->len, ETH_ZLEN);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700855 ring->packets++;
856
857 }
Yevgeny Petrilin5b263f52012-04-23 02:18:50 +0000858 ring->bytes += tx_info->nr_bytes;
859 netdev_tx_sent_queue(ring->tx_queue, tx_info->nr_bytes);
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700860 AVG_PERF_COUNTER(priv->pstats.tx_pktsz_avg, skb->len);
861
Amir Vadai237a3a32013-08-21 10:08:58 +0300862 if (tx_info->inl) {
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700863 build_inline_wqe(tx_desc, skb, real_size, &vlan_tag, tx_ind, fragptr);
Yevgeny Petrilin41efea52009-01-08 10:57:15 -0800864 tx_info->inl = 1;
865 }
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700866
Or Gerlitz837052d2013-12-23 16:09:44 +0200867 if (skb->encapsulation) {
868 struct iphdr *ipv4 = (struct iphdr *)skb_inner_network_header(skb);
869 if (ipv4->protocol == IPPROTO_TCP || ipv4->protocol == IPPROTO_UDP)
870 op_own |= cpu_to_be32(MLX4_WQE_CTRL_IIP | MLX4_WQE_CTRL_ILP);
871 else
872 op_own |= cpu_to_be32(MLX4_WQE_CTRL_IIP);
873 }
874
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700875 ring->prod += nr_txbb;
876
877 /* If we used a bounce buffer then copy descriptor back into place */
Yevgeny Petrilin87a5c382011-03-22 22:38:52 +0000878 if (bounce)
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700879 tx_desc = mlx4_en_bounce_to_desc(priv, ring, index, desc_size);
880
Amir Vadaieb0cabb2013-04-23 06:06:50 +0000881 skb_tx_timestamp(skb);
882
Moni Shoua2b39a062012-10-25 01:12:48 +0000883 if (ring->bf_enabled && desc_size <= MAX_BF && !bounce && !vlan_tx_tag_present(skb)) {
David S. Miller1805b2f2011-10-24 18:18:09 -0400884 *(__be32 *) (&tx_desc->ctrl.vlan_tag) |= cpu_to_be32(ring->doorbell_qpn);
Yevgeny Petrilin87a5c382011-03-22 22:38:52 +0000885 op_own |= htonl((bf_index & 0xffff) << 8);
886 /* Ensure new descirptor hits memory
887 * before setting ownership of this descriptor to HW */
888 wmb();
889 tx_desc->ctrl.owner_opcode = op_own;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700890
Yevgeny Petrilin87a5c382011-03-22 22:38:52 +0000891 wmb();
892
893 mlx4_bf_copy(ring->bf.reg + ring->bf.offset, (unsigned long *) &tx_desc->ctrl,
894 desc_size);
895
896 wmb();
897
898 ring->bf.offset ^= ring->bf.buf_size;
899 } else {
900 /* Ensure new descirptor hits memory
901 * before setting ownership of this descriptor to HW */
902 wmb();
903 tx_desc->ctrl.owner_opcode = op_own;
904 wmb();
David S. Miller1805b2f2011-10-24 18:18:09 -0400905 iowrite32be(ring->doorbell_qpn, ring->bf.uar->map + MLX4_SEND_DOORBELL);
Yevgeny Petrilin87a5c382011-03-22 22:38:52 +0000906 }
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700907
Patrick McHardyec634fe2009-07-05 19:23:38 -0700908 return NETDEV_TX_OK;
Yevgeny Petrilin7e230912009-06-20 22:15:31 +0000909
Amir Vadai237a3a32013-08-21 10:08:58 +0300910tx_drop_unmap:
911 en_err(priv, "DMA mapping error\n");
912
913 for (i++; i < skb_shinfo(skb)->nr_frags; i++) {
914 data++;
915 dma_unmap_page(ddev, (dma_addr_t) be64_to_cpu(data->addr),
916 be32_to_cpu(data->byte_count),
917 PCI_DMA_TODEVICE);
918 }
919
Yevgeny Petrilin7e230912009-06-20 22:15:31 +0000920tx_drop:
921 dev_kfree_skb_any(skb);
922 priv->stats.tx_dropped++;
923 return NETDEV_TX_OK;
Yevgeny Petrilinc27a02c2008-10-22 15:47:49 -0700924}
925