Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 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/mlx4/qp.h> |
| 37 | #include <linux/skbuff.h> |
| 38 | #include <linux/if_vlan.h> |
| 39 | #include <linux/vmalloc.h> |
| 40 | |
| 41 | #include "mlx4_en.h" |
| 42 | |
| 43 | enum { |
| 44 | MAX_INLINE = 104, /* 128 - 16 - 4 - 4 */ |
| 45 | }; |
| 46 | |
| 47 | static int inline_thold __read_mostly = MAX_INLINE; |
| 48 | |
| 49 | module_param_named(inline_thold, inline_thold, int, 0444); |
| 50 | MODULE_PARM_DESC(inline_thold, "treshold for using inline data"); |
| 51 | |
| 52 | int mlx4_en_create_tx_ring(struct mlx4_en_priv *priv, |
| 53 | struct mlx4_en_tx_ring *ring, u32 size, |
| 54 | u16 stride) |
| 55 | { |
| 56 | struct mlx4_en_dev *mdev = priv->mdev; |
| 57 | int tmp; |
| 58 | int err; |
| 59 | |
| 60 | ring->size = size; |
| 61 | ring->size_mask = size - 1; |
| 62 | ring->stride = stride; |
| 63 | |
| 64 | inline_thold = min(inline_thold, MAX_INLINE); |
| 65 | |
| 66 | spin_lock_init(&ring->comp_lock); |
| 67 | |
| 68 | tmp = size * sizeof(struct mlx4_en_tx_info); |
| 69 | ring->tx_info = vmalloc(tmp); |
| 70 | if (!ring->tx_info) { |
Yevgeny Petrilin | 453a608 | 2009-06-01 20:27:13 +0000 | [diff] [blame] | 71 | en_err(priv, "Failed allocating tx_info ring\n"); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 72 | return -ENOMEM; |
| 73 | } |
Yevgeny Petrilin | 453a608 | 2009-06-01 20:27:13 +0000 | [diff] [blame] | 74 | en_dbg(DRV, priv, "Allocated tx_info ring at addr:%p size:%d\n", |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 75 | ring->tx_info, tmp); |
| 76 | |
| 77 | ring->bounce_buf = kmalloc(MAX_DESC_SIZE, GFP_KERNEL); |
| 78 | if (!ring->bounce_buf) { |
Yevgeny Petrilin | 453a608 | 2009-06-01 20:27:13 +0000 | [diff] [blame] | 79 | en_err(priv, "Failed allocating bounce buffer\n"); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 80 | err = -ENOMEM; |
| 81 | goto err_tx; |
| 82 | } |
| 83 | ring->buf_size = ALIGN(size * ring->stride, MLX4_EN_PAGE_SIZE); |
| 84 | |
| 85 | err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres, ring->buf_size, |
| 86 | 2 * PAGE_SIZE); |
| 87 | if (err) { |
Yevgeny Petrilin | 453a608 | 2009-06-01 20:27:13 +0000 | [diff] [blame] | 88 | en_err(priv, "Failed allocating hwq resources\n"); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 89 | goto err_bounce; |
| 90 | } |
| 91 | |
| 92 | err = mlx4_en_map_buffer(&ring->wqres.buf); |
| 93 | if (err) { |
Yevgeny Petrilin | 453a608 | 2009-06-01 20:27:13 +0000 | [diff] [blame] | 94 | en_err(priv, "Failed to map TX buffer\n"); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 95 | goto err_hwq_res; |
| 96 | } |
| 97 | |
| 98 | ring->buf = ring->wqres.buf.direct.buf; |
| 99 | |
Yevgeny Petrilin | 453a608 | 2009-06-01 20:27:13 +0000 | [diff] [blame] | 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); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 103 | |
| 104 | err = mlx4_qp_reserve_range(mdev->dev, 1, 1, &ring->qpn); |
| 105 | if (err) { |
Yevgeny Petrilin | 453a608 | 2009-06-01 20:27:13 +0000 | [diff] [blame] | 106 | en_err(priv, "Failed reserving qp for tx ring.\n"); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 107 | goto err_map; |
| 108 | } |
| 109 | |
| 110 | err = mlx4_qp_alloc(mdev->dev, ring->qpn, &ring->qp); |
| 111 | if (err) { |
Yevgeny Petrilin | 453a608 | 2009-06-01 20:27:13 +0000 | [diff] [blame] | 112 | en_err(priv, "Failed allocating qp %d\n", ring->qpn); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 113 | goto err_reserve; |
| 114 | } |
Yevgeny Petrilin | 966508f | 2009-04-20 04:30:03 +0000 | [diff] [blame] | 115 | ring->qp.event = mlx4_en_sqp_event; |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 116 | |
| 117 | return 0; |
| 118 | |
| 119 | err_reserve: |
| 120 | mlx4_qp_release_range(mdev->dev, ring->qpn, 1); |
| 121 | err_map: |
| 122 | mlx4_en_unmap_buffer(&ring->wqres.buf); |
| 123 | err_hwq_res: |
| 124 | mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size); |
| 125 | err_bounce: |
| 126 | kfree(ring->bounce_buf); |
| 127 | ring->bounce_buf = NULL; |
| 128 | err_tx: |
| 129 | vfree(ring->tx_info); |
| 130 | ring->tx_info = NULL; |
| 131 | return err; |
| 132 | } |
| 133 | |
| 134 | void mlx4_en_destroy_tx_ring(struct mlx4_en_priv *priv, |
| 135 | struct mlx4_en_tx_ring *ring) |
| 136 | { |
| 137 | struct mlx4_en_dev *mdev = priv->mdev; |
Yevgeny Petrilin | 453a608 | 2009-06-01 20:27:13 +0000 | [diff] [blame] | 138 | en_dbg(DRV, priv, "Destroying tx ring, qpn: %d\n", ring->qpn); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 139 | |
| 140 | mlx4_qp_remove(mdev->dev, &ring->qp); |
| 141 | mlx4_qp_free(mdev->dev, &ring->qp); |
| 142 | mlx4_qp_release_range(mdev->dev, ring->qpn, 1); |
| 143 | mlx4_en_unmap_buffer(&ring->wqres.buf); |
| 144 | mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size); |
| 145 | kfree(ring->bounce_buf); |
| 146 | ring->bounce_buf = NULL; |
| 147 | vfree(ring->tx_info); |
| 148 | ring->tx_info = NULL; |
| 149 | } |
| 150 | |
| 151 | int mlx4_en_activate_tx_ring(struct mlx4_en_priv *priv, |
| 152 | struct mlx4_en_tx_ring *ring, |
Yevgeny Petrilin | 9f519f6 | 2009-08-06 19:28:18 -0700 | [diff] [blame^] | 153 | int cq) |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 154 | { |
| 155 | struct mlx4_en_dev *mdev = priv->mdev; |
| 156 | int err; |
| 157 | |
| 158 | ring->cqn = cq; |
| 159 | ring->prod = 0; |
| 160 | ring->cons = 0xffffffff; |
| 161 | ring->last_nr_txbb = 1; |
| 162 | ring->poll_cnt = 0; |
| 163 | ring->blocked = 0; |
| 164 | memset(ring->tx_info, 0, ring->size * sizeof(struct mlx4_en_tx_info)); |
| 165 | memset(ring->buf, 0, ring->buf_size); |
| 166 | |
| 167 | ring->qp_state = MLX4_QP_STATE_RST; |
| 168 | ring->doorbell_qpn = swab32(ring->qp.qpn << 8); |
| 169 | |
| 170 | mlx4_en_fill_qp_context(priv, ring->size, ring->stride, 1, 0, ring->qpn, |
Yevgeny Petrilin | 9f519f6 | 2009-08-06 19:28:18 -0700 | [diff] [blame^] | 171 | ring->cqn, &ring->context); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 172 | |
| 173 | err = mlx4_qp_to_ready(mdev->dev, &ring->wqres.mtt, &ring->context, |
| 174 | &ring->qp, &ring->qp_state); |
| 175 | |
| 176 | return err; |
| 177 | } |
| 178 | |
| 179 | void mlx4_en_deactivate_tx_ring(struct mlx4_en_priv *priv, |
| 180 | struct mlx4_en_tx_ring *ring) |
| 181 | { |
| 182 | struct mlx4_en_dev *mdev = priv->mdev; |
| 183 | |
| 184 | mlx4_qp_modify(mdev->dev, NULL, ring->qp_state, |
| 185 | MLX4_QP_STATE_RST, NULL, 0, 0, &ring->qp); |
| 186 | } |
| 187 | |
| 188 | |
| 189 | static u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv, |
| 190 | struct mlx4_en_tx_ring *ring, |
| 191 | int index, u8 owner) |
| 192 | { |
| 193 | struct mlx4_en_dev *mdev = priv->mdev; |
| 194 | struct mlx4_en_tx_info *tx_info = &ring->tx_info[index]; |
| 195 | struct mlx4_en_tx_desc *tx_desc = ring->buf + index * TXBB_SIZE; |
| 196 | struct mlx4_wqe_data_seg *data = (void *) tx_desc + tx_info->data_offset; |
| 197 | struct sk_buff *skb = tx_info->skb; |
| 198 | struct skb_frag_struct *frag; |
| 199 | void *end = ring->buf + ring->buf_size; |
| 200 | int frags = skb_shinfo(skb)->nr_frags; |
| 201 | int i; |
| 202 | __be32 *ptr = (__be32 *)tx_desc; |
| 203 | __be32 stamp = cpu_to_be32(STAMP_VAL | (!!owner << STAMP_SHIFT)); |
| 204 | |
| 205 | /* Optimize the common case when there are no wraparounds */ |
| 206 | if (likely((void *) tx_desc + tx_info->nr_txbb * TXBB_SIZE <= end)) { |
Yevgeny Petrilin | 41efea5 | 2009-01-08 10:57:15 -0800 | [diff] [blame] | 207 | if (!tx_info->inl) { |
| 208 | if (tx_info->linear) { |
| 209 | pci_unmap_single(mdev->pdev, |
| 210 | (dma_addr_t) be64_to_cpu(data->addr), |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 211 | be32_to_cpu(data->byte_count), |
| 212 | PCI_DMA_TODEVICE); |
Yevgeny Petrilin | 41efea5 | 2009-01-08 10:57:15 -0800 | [diff] [blame] | 213 | ++data; |
| 214 | } |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 215 | |
Yevgeny Petrilin | 41efea5 | 2009-01-08 10:57:15 -0800 | [diff] [blame] | 216 | for (i = 0; i < frags; i++) { |
| 217 | frag = &skb_shinfo(skb)->frags[i]; |
| 218 | pci_unmap_page(mdev->pdev, |
| 219 | (dma_addr_t) be64_to_cpu(data[i].addr), |
| 220 | frag->size, PCI_DMA_TODEVICE); |
| 221 | } |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 222 | } |
| 223 | /* Stamp the freed descriptor */ |
| 224 | for (i = 0; i < tx_info->nr_txbb * TXBB_SIZE; i += STAMP_STRIDE) { |
| 225 | *ptr = stamp; |
| 226 | ptr += STAMP_DWORDS; |
| 227 | } |
| 228 | |
| 229 | } else { |
Yevgeny Petrilin | 41efea5 | 2009-01-08 10:57:15 -0800 | [diff] [blame] | 230 | if (!tx_info->inl) { |
| 231 | if ((void *) data >= end) { |
| 232 | data = (struct mlx4_wqe_data_seg *) |
| 233 | (ring->buf + ((void *) data - end)); |
| 234 | } |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 235 | |
Yevgeny Petrilin | 41efea5 | 2009-01-08 10:57:15 -0800 | [diff] [blame] | 236 | if (tx_info->linear) { |
| 237 | pci_unmap_single(mdev->pdev, |
| 238 | (dma_addr_t) be64_to_cpu(data->addr), |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 239 | be32_to_cpu(data->byte_count), |
| 240 | PCI_DMA_TODEVICE); |
Yevgeny Petrilin | 41efea5 | 2009-01-08 10:57:15 -0800 | [diff] [blame] | 241 | ++data; |
| 242 | } |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 243 | |
Yevgeny Petrilin | 41efea5 | 2009-01-08 10:57:15 -0800 | [diff] [blame] | 244 | for (i = 0; i < frags; i++) { |
| 245 | /* Check for wraparound before unmapping */ |
| 246 | if ((void *) data >= end) |
| 247 | data = (struct mlx4_wqe_data_seg *) ring->buf; |
| 248 | frag = &skb_shinfo(skb)->frags[i]; |
| 249 | pci_unmap_page(mdev->pdev, |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 250 | (dma_addr_t) be64_to_cpu(data->addr), |
| 251 | frag->size, PCI_DMA_TODEVICE); |
Yevgeny Petrilin | 41efea5 | 2009-01-08 10:57:15 -0800 | [diff] [blame] | 252 | } |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 253 | } |
| 254 | /* Stamp the freed descriptor */ |
| 255 | for (i = 0; i < tx_info->nr_txbb * TXBB_SIZE; i += STAMP_STRIDE) { |
| 256 | *ptr = stamp; |
| 257 | ptr += STAMP_DWORDS; |
| 258 | if ((void *) ptr >= end) { |
| 259 | ptr = ring->buf; |
| 260 | stamp ^= cpu_to_be32(0x80000000); |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | } |
| 265 | dev_kfree_skb_any(skb); |
| 266 | return tx_info->nr_txbb; |
| 267 | } |
| 268 | |
| 269 | |
| 270 | int mlx4_en_free_tx_buf(struct net_device *dev, struct mlx4_en_tx_ring *ring) |
| 271 | { |
| 272 | struct mlx4_en_priv *priv = netdev_priv(dev); |
| 273 | int cnt = 0; |
| 274 | |
| 275 | /* Skip last polled descriptor */ |
| 276 | ring->cons += ring->last_nr_txbb; |
Yevgeny Petrilin | 453a608 | 2009-06-01 20:27:13 +0000 | [diff] [blame] | 277 | en_dbg(DRV, priv, "Freeing Tx buf - cons:0x%x prod:0x%x\n", |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 278 | ring->cons, ring->prod); |
| 279 | |
| 280 | if ((u32) (ring->prod - ring->cons) > ring->size) { |
| 281 | if (netif_msg_tx_err(priv)) |
Yevgeny Petrilin | 453a608 | 2009-06-01 20:27:13 +0000 | [diff] [blame] | 282 | en_warn(priv, "Tx consumer passed producer!\n"); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | while (ring->cons != ring->prod) { |
| 287 | ring->last_nr_txbb = mlx4_en_free_tx_desc(priv, ring, |
| 288 | ring->cons & ring->size_mask, |
| 289 | !!(ring->cons & ring->size)); |
| 290 | ring->cons += ring->last_nr_txbb; |
| 291 | cnt++; |
| 292 | } |
| 293 | |
| 294 | if (cnt) |
Yevgeny Petrilin | 453a608 | 2009-06-01 20:27:13 +0000 | [diff] [blame] | 295 | en_dbg(DRV, priv, "Freed %d uncompleted tx descriptors\n", cnt); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 296 | |
| 297 | return cnt; |
| 298 | } |
| 299 | |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 300 | |
| 301 | static void mlx4_en_process_tx_cq(struct net_device *dev, struct mlx4_en_cq *cq) |
| 302 | { |
| 303 | struct mlx4_en_priv *priv = netdev_priv(dev); |
| 304 | struct mlx4_cq *mcq = &cq->mcq; |
| 305 | struct mlx4_en_tx_ring *ring = &priv->tx_ring[cq->ring]; |
| 306 | struct mlx4_cqe *cqe = cq->buf; |
| 307 | u16 index; |
| 308 | u16 new_index; |
| 309 | u32 txbbs_skipped = 0; |
| 310 | u32 cq_last_sav; |
| 311 | |
| 312 | /* index always points to the first TXBB of the last polled descriptor */ |
| 313 | index = ring->cons & ring->size_mask; |
| 314 | new_index = be16_to_cpu(cqe->wqe_index) & ring->size_mask; |
| 315 | if (index == new_index) |
| 316 | return; |
| 317 | |
| 318 | if (!priv->port_up) |
| 319 | return; |
| 320 | |
| 321 | /* |
| 322 | * We use a two-stage loop: |
| 323 | * - the first samples the HW-updated CQE |
| 324 | * - the second frees TXBBs until the last sample |
| 325 | * This lets us amortize CQE cache misses, while still polling the CQ |
| 326 | * until is quiescent. |
| 327 | */ |
| 328 | cq_last_sav = mcq->cons_index; |
| 329 | do { |
| 330 | do { |
| 331 | /* Skip over last polled CQE */ |
| 332 | index = (index + ring->last_nr_txbb) & ring->size_mask; |
| 333 | txbbs_skipped += ring->last_nr_txbb; |
| 334 | |
| 335 | /* Poll next CQE */ |
| 336 | ring->last_nr_txbb = mlx4_en_free_tx_desc( |
| 337 | priv, ring, index, |
| 338 | !!((ring->cons + txbbs_skipped) & |
| 339 | ring->size)); |
| 340 | ++mcq->cons_index; |
| 341 | |
| 342 | } while (index != new_index); |
| 343 | |
| 344 | new_index = be16_to_cpu(cqe->wqe_index) & ring->size_mask; |
| 345 | } while (index != new_index); |
| 346 | AVG_PERF_COUNTER(priv->pstats.tx_coal_avg, |
| 347 | (u32) (mcq->cons_index - cq_last_sav)); |
| 348 | |
| 349 | /* |
| 350 | * To prevent CQ overflow we first update CQ consumer and only then |
| 351 | * the ring consumer. |
| 352 | */ |
| 353 | mlx4_cq_set_ci(mcq); |
| 354 | wmb(); |
| 355 | ring->cons += txbbs_skipped; |
| 356 | |
| 357 | /* Wakeup Tx queue if this ring stopped it */ |
| 358 | if (unlikely(ring->blocked)) { |
Yevgeny Petrilin | c03ea21 | 2008-12-25 18:14:04 -0800 | [diff] [blame] | 359 | if ((u32) (ring->prod - ring->cons) <= |
| 360 | ring->size - HEADROOM - MAX_DESC_TXBBS) { |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 361 | ring->blocked = 0; |
Yevgeny Petrilin | f813cad | 2009-06-01 23:24:07 +0000 | [diff] [blame] | 362 | netif_tx_wake_queue(netdev_get_tx_queue(dev, cq->ring)); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 363 | priv->port_stats.wake_queue++; |
| 364 | } |
| 365 | } |
| 366 | } |
| 367 | |
| 368 | void mlx4_en_tx_irq(struct mlx4_cq *mcq) |
| 369 | { |
| 370 | struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq); |
| 371 | struct mlx4_en_priv *priv = netdev_priv(cq->dev); |
| 372 | struct mlx4_en_tx_ring *ring = &priv->tx_ring[cq->ring]; |
| 373 | |
Yevgeny Petrilin | 48374dd | 2008-12-25 18:13:45 -0800 | [diff] [blame] | 374 | if (!spin_trylock(&ring->comp_lock)) |
| 375 | return; |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 376 | mlx4_en_process_tx_cq(cq->dev, cq); |
Yevgeny Petrilin | 48374dd | 2008-12-25 18:13:45 -0800 | [diff] [blame] | 377 | mod_timer(&cq->timer, jiffies + 1); |
| 378 | spin_unlock(&ring->comp_lock); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 379 | } |
| 380 | |
| 381 | |
| 382 | void mlx4_en_poll_tx_cq(unsigned long data) |
| 383 | { |
| 384 | struct mlx4_en_cq *cq = (struct mlx4_en_cq *) data; |
| 385 | struct mlx4_en_priv *priv = netdev_priv(cq->dev); |
| 386 | struct mlx4_en_tx_ring *ring = &priv->tx_ring[cq->ring]; |
| 387 | u32 inflight; |
| 388 | |
| 389 | INC_PERF_COUNTER(priv->pstats.tx_poll); |
| 390 | |
Yevgeny Petrilin | 465440d | 2009-05-25 20:57:21 +0000 | [diff] [blame] | 391 | if (!spin_trylock_irq(&ring->comp_lock)) { |
Yevgeny Petrilin | 48374dd | 2008-12-25 18:13:45 -0800 | [diff] [blame] | 392 | mod_timer(&cq->timer, jiffies + MLX4_EN_TX_POLL_TIMEOUT); |
| 393 | return; |
| 394 | } |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 395 | mlx4_en_process_tx_cq(cq->dev, cq); |
| 396 | inflight = (u32) (ring->prod - ring->cons - ring->last_nr_txbb); |
| 397 | |
| 398 | /* If there are still packets in flight and the timer has not already |
| 399 | * been scheduled by the Tx routine then schedule it here to guarantee |
| 400 | * completion processing of these packets */ |
| 401 | if (inflight && priv->port_up) |
| 402 | mod_timer(&cq->timer, jiffies + MLX4_EN_TX_POLL_TIMEOUT); |
| 403 | |
Yevgeny Petrilin | 465440d | 2009-05-25 20:57:21 +0000 | [diff] [blame] | 404 | spin_unlock_irq(&ring->comp_lock); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 405 | } |
| 406 | |
| 407 | static struct mlx4_en_tx_desc *mlx4_en_bounce_to_desc(struct mlx4_en_priv *priv, |
| 408 | struct mlx4_en_tx_ring *ring, |
| 409 | u32 index, |
| 410 | unsigned int desc_size) |
| 411 | { |
| 412 | u32 copy = (ring->size - index) * TXBB_SIZE; |
| 413 | int i; |
| 414 | |
| 415 | for (i = desc_size - copy - 4; i >= 0; i -= 4) { |
| 416 | if ((i & (TXBB_SIZE - 1)) == 0) |
| 417 | wmb(); |
| 418 | |
| 419 | *((u32 *) (ring->buf + i)) = |
| 420 | *((u32 *) (ring->bounce_buf + copy + i)); |
| 421 | } |
| 422 | |
| 423 | for (i = copy - 4; i >= 4 ; i -= 4) { |
| 424 | if ((i & (TXBB_SIZE - 1)) == 0) |
| 425 | wmb(); |
| 426 | |
| 427 | *((u32 *) (ring->buf + index * TXBB_SIZE + i)) = |
| 428 | *((u32 *) (ring->bounce_buf + i)); |
| 429 | } |
| 430 | |
| 431 | /* Return real descriptor location */ |
| 432 | return ring->buf + index * TXBB_SIZE; |
| 433 | } |
| 434 | |
| 435 | static inline void mlx4_en_xmit_poll(struct mlx4_en_priv *priv, int tx_ind) |
| 436 | { |
| 437 | struct mlx4_en_cq *cq = &priv->tx_cq[tx_ind]; |
| 438 | struct mlx4_en_tx_ring *ring = &priv->tx_ring[tx_ind]; |
| 439 | |
| 440 | /* If we don't have a pending timer, set one up to catch our recent |
| 441 | post in case the interface becomes idle */ |
| 442 | if (!timer_pending(&cq->timer)) |
| 443 | mod_timer(&cq->timer, jiffies + MLX4_EN_TX_POLL_TIMEOUT); |
| 444 | |
| 445 | /* Poll the CQ every mlx4_en_TX_MODER_POLL packets */ |
| 446 | if ((++ring->poll_cnt & (MLX4_EN_TX_POLL_MODER - 1)) == 0) |
Yevgeny Petrilin | 465440d | 2009-05-25 20:57:21 +0000 | [diff] [blame] | 447 | if (spin_trylock_irq(&ring->comp_lock)) { |
Yevgeny Petrilin | 48374dd | 2008-12-25 18:13:45 -0800 | [diff] [blame] | 448 | mlx4_en_process_tx_cq(priv->dev, cq); |
Yevgeny Petrilin | 465440d | 2009-05-25 20:57:21 +0000 | [diff] [blame] | 449 | spin_unlock_irq(&ring->comp_lock); |
Yevgeny Petrilin | 48374dd | 2008-12-25 18:13:45 -0800 | [diff] [blame] | 450 | } |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 451 | } |
| 452 | |
| 453 | static void *get_frag_ptr(struct sk_buff *skb) |
| 454 | { |
| 455 | struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[0]; |
| 456 | struct page *page = frag->page; |
| 457 | void *ptr; |
| 458 | |
| 459 | ptr = page_address(page); |
| 460 | if (unlikely(!ptr)) |
| 461 | return NULL; |
| 462 | |
| 463 | return ptr + frag->page_offset; |
| 464 | } |
| 465 | |
| 466 | static int is_inline(struct sk_buff *skb, void **pfrag) |
| 467 | { |
| 468 | void *ptr; |
| 469 | |
| 470 | if (inline_thold && !skb_is_gso(skb) && skb->len <= inline_thold) { |
| 471 | if (skb_shinfo(skb)->nr_frags == 1) { |
| 472 | ptr = get_frag_ptr(skb); |
| 473 | if (unlikely(!ptr)) |
| 474 | return 0; |
| 475 | |
| 476 | if (pfrag) |
| 477 | *pfrag = ptr; |
| 478 | |
| 479 | return 1; |
| 480 | } else if (unlikely(skb_shinfo(skb)->nr_frags)) |
| 481 | return 0; |
| 482 | else |
| 483 | return 1; |
| 484 | } |
| 485 | |
| 486 | return 0; |
| 487 | } |
| 488 | |
| 489 | static int inline_size(struct sk_buff *skb) |
| 490 | { |
| 491 | if (skb->len + CTRL_SIZE + sizeof(struct mlx4_wqe_inline_seg) |
| 492 | <= MLX4_INLINE_ALIGN) |
| 493 | return ALIGN(skb->len + CTRL_SIZE + |
| 494 | sizeof(struct mlx4_wqe_inline_seg), 16); |
| 495 | else |
| 496 | return ALIGN(skb->len + CTRL_SIZE + 2 * |
| 497 | sizeof(struct mlx4_wqe_inline_seg), 16); |
| 498 | } |
| 499 | |
| 500 | static int get_real_size(struct sk_buff *skb, struct net_device *dev, |
| 501 | int *lso_header_size) |
| 502 | { |
| 503 | struct mlx4_en_priv *priv = netdev_priv(dev); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 504 | int real_size; |
| 505 | |
| 506 | if (skb_is_gso(skb)) { |
| 507 | *lso_header_size = skb_transport_offset(skb) + tcp_hdrlen(skb); |
| 508 | real_size = CTRL_SIZE + skb_shinfo(skb)->nr_frags * DS_SIZE + |
| 509 | ALIGN(*lso_header_size + 4, DS_SIZE); |
| 510 | if (unlikely(*lso_header_size != skb_headlen(skb))) { |
| 511 | /* We add a segment for the skb linear buffer only if |
| 512 | * it contains data */ |
| 513 | if (*lso_header_size < skb_headlen(skb)) |
| 514 | real_size += DS_SIZE; |
| 515 | else { |
| 516 | if (netif_msg_tx_err(priv)) |
Yevgeny Petrilin | 453a608 | 2009-06-01 20:27:13 +0000 | [diff] [blame] | 517 | en_warn(priv, "Non-linear headers\n"); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 518 | return 0; |
| 519 | } |
| 520 | } |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 521 | } else { |
| 522 | *lso_header_size = 0; |
| 523 | if (!is_inline(skb, NULL)) |
| 524 | real_size = CTRL_SIZE + (skb_shinfo(skb)->nr_frags + 1) * DS_SIZE; |
| 525 | else |
| 526 | real_size = inline_size(skb); |
| 527 | } |
| 528 | |
| 529 | return real_size; |
| 530 | } |
| 531 | |
| 532 | static void build_inline_wqe(struct mlx4_en_tx_desc *tx_desc, struct sk_buff *skb, |
| 533 | int real_size, u16 *vlan_tag, int tx_ind, void *fragptr) |
| 534 | { |
| 535 | struct mlx4_wqe_inline_seg *inl = &tx_desc->inl; |
| 536 | int spc = MLX4_INLINE_ALIGN - CTRL_SIZE - sizeof *inl; |
| 537 | |
| 538 | if (skb->len <= spc) { |
| 539 | inl->byte_count = cpu_to_be32(1 << 31 | skb->len); |
| 540 | skb_copy_from_linear_data(skb, inl + 1, skb_headlen(skb)); |
| 541 | if (skb_shinfo(skb)->nr_frags) |
| 542 | memcpy(((void *)(inl + 1)) + skb_headlen(skb), fragptr, |
| 543 | skb_shinfo(skb)->frags[0].size); |
| 544 | |
| 545 | } else { |
| 546 | inl->byte_count = cpu_to_be32(1 << 31 | spc); |
| 547 | if (skb_headlen(skb) <= spc) { |
| 548 | skb_copy_from_linear_data(skb, inl + 1, skb_headlen(skb)); |
| 549 | if (skb_headlen(skb) < spc) { |
| 550 | memcpy(((void *)(inl + 1)) + skb_headlen(skb), |
| 551 | fragptr, spc - skb_headlen(skb)); |
| 552 | fragptr += spc - skb_headlen(skb); |
| 553 | } |
| 554 | inl = (void *) (inl + 1) + spc; |
| 555 | memcpy(((void *)(inl + 1)), fragptr, skb->len - spc); |
| 556 | } else { |
| 557 | skb_copy_from_linear_data(skb, inl + 1, spc); |
| 558 | inl = (void *) (inl + 1) + spc; |
| 559 | skb_copy_from_linear_data_offset(skb, spc, inl + 1, |
| 560 | skb_headlen(skb) - spc); |
| 561 | if (skb_shinfo(skb)->nr_frags) |
| 562 | memcpy(((void *)(inl + 1)) + skb_headlen(skb) - spc, |
| 563 | fragptr, skb_shinfo(skb)->frags[0].size); |
| 564 | } |
| 565 | |
| 566 | wmb(); |
| 567 | inl->byte_count = cpu_to_be32(1 << 31 | (skb->len - spc)); |
| 568 | } |
| 569 | tx_desc->ctrl.vlan_tag = cpu_to_be16(*vlan_tag); |
| 570 | tx_desc->ctrl.ins_vlan = MLX4_WQE_CTRL_INS_VLAN * !!(*vlan_tag); |
| 571 | tx_desc->ctrl.fence_size = (real_size / 16) & 0x3f; |
| 572 | } |
| 573 | |
Yevgeny Petrilin | f813cad | 2009-06-01 23:24:07 +0000 | [diff] [blame] | 574 | u16 mlx4_en_select_queue(struct net_device *dev, struct sk_buff *skb) |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 575 | { |
Yevgeny Petrilin | f813cad | 2009-06-01 23:24:07 +0000 | [diff] [blame] | 576 | struct mlx4_en_priv *priv = netdev_priv(dev); |
| 577 | u16 vlan_tag = 0; |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 578 | |
Yevgeny Petrilin | f813cad | 2009-06-01 23:24:07 +0000 | [diff] [blame] | 579 | /* If we support per priority flow control and the packet contains |
| 580 | * a vlan tag, send the packet to the TX ring assigned to that priority |
| 581 | */ |
| 582 | if (priv->prof->rx_ppp && priv->vlgrp && vlan_tx_tag_present(skb)) { |
| 583 | vlan_tag = vlan_tx_tag_get(skb); |
| 584 | return MLX4_EN_NUM_TX_RINGS + (vlan_tag >> 13); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 585 | } |
Yevgeny Petrilin | f813cad | 2009-06-01 23:24:07 +0000 | [diff] [blame] | 586 | |
| 587 | return skb_tx_hash(dev, skb); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 588 | } |
| 589 | |
| 590 | int mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev) |
| 591 | { |
| 592 | struct mlx4_en_priv *priv = netdev_priv(dev); |
| 593 | struct mlx4_en_dev *mdev = priv->mdev; |
| 594 | struct mlx4_en_tx_ring *ring; |
| 595 | struct mlx4_en_cq *cq; |
| 596 | struct mlx4_en_tx_desc *tx_desc; |
| 597 | struct mlx4_wqe_data_seg *data; |
| 598 | struct skb_frag_struct *frag; |
| 599 | struct mlx4_en_tx_info *tx_info; |
| 600 | int tx_ind = 0; |
| 601 | int nr_txbb; |
| 602 | int desc_size; |
| 603 | int real_size; |
| 604 | dma_addr_t dma; |
| 605 | u32 index; |
| 606 | __be32 op_own; |
Yevgeny Petrilin | f813cad | 2009-06-01 23:24:07 +0000 | [diff] [blame] | 607 | u16 vlan_tag = 0; |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 608 | int i; |
| 609 | int lso_header_size; |
| 610 | void *fragptr; |
| 611 | |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 612 | real_size = get_real_size(skb, dev, &lso_header_size); |
| 613 | if (unlikely(!real_size)) |
Yevgeny Petrilin | 7e23091 | 2009-06-20 22:15:31 +0000 | [diff] [blame] | 614 | goto tx_drop; |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 615 | |
| 616 | /* Allign descriptor to TXBB size */ |
| 617 | desc_size = ALIGN(real_size, TXBB_SIZE); |
| 618 | nr_txbb = desc_size / TXBB_SIZE; |
| 619 | if (unlikely(nr_txbb > MAX_DESC_TXBBS)) { |
| 620 | if (netif_msg_tx_err(priv)) |
Yevgeny Petrilin | 453a608 | 2009-06-01 20:27:13 +0000 | [diff] [blame] | 621 | en_warn(priv, "Oversized header or SG list\n"); |
Yevgeny Petrilin | 7e23091 | 2009-06-20 22:15:31 +0000 | [diff] [blame] | 622 | goto tx_drop; |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 623 | } |
| 624 | |
Yevgeny Petrilin | f813cad | 2009-06-01 23:24:07 +0000 | [diff] [blame] | 625 | tx_ind = skb->queue_mapping; |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 626 | ring = &priv->tx_ring[tx_ind]; |
Yevgeny Petrilin | f813cad | 2009-06-01 23:24:07 +0000 | [diff] [blame] | 627 | if (priv->vlgrp && vlan_tx_tag_present(skb)) |
| 628 | vlan_tag = vlan_tx_tag_get(skb); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 629 | |
| 630 | /* Check available TXBBs And 2K spare for prefetch */ |
| 631 | if (unlikely(((int)(ring->prod - ring->cons)) > |
| 632 | ring->size - HEADROOM - MAX_DESC_TXBBS)) { |
Yevgeny Petrilin | f813cad | 2009-06-01 23:24:07 +0000 | [diff] [blame] | 633 | /* every full Tx ring stops queue */ |
| 634 | netif_tx_stop_queue(netdev_get_tx_queue(dev, tx_ind)); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 635 | ring->blocked = 1; |
| 636 | priv->port_stats.queue_stopped++; |
| 637 | |
| 638 | /* Use interrupts to find out when queue opened */ |
| 639 | cq = &priv->tx_cq[tx_ind]; |
| 640 | mlx4_en_arm_cq(priv, cq); |
| 641 | return NETDEV_TX_BUSY; |
| 642 | } |
| 643 | |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 644 | /* Track current inflight packets for performance analysis */ |
| 645 | AVG_PERF_COUNTER(priv->pstats.inflight_avg, |
| 646 | (u32) (ring->prod - ring->cons - 1)); |
| 647 | |
| 648 | /* Packet is good - grab an index and transmit it */ |
| 649 | index = ring->prod & ring->size_mask; |
| 650 | |
| 651 | /* See if we have enough space for whole descriptor TXBB for setting |
| 652 | * SW ownership on next descriptor; if not, use a bounce buffer. */ |
| 653 | if (likely(index + nr_txbb <= ring->size)) |
| 654 | tx_desc = ring->buf + index * TXBB_SIZE; |
| 655 | else |
| 656 | tx_desc = (struct mlx4_en_tx_desc *) ring->bounce_buf; |
| 657 | |
| 658 | /* Save skb in tx_info ring */ |
| 659 | tx_info = &ring->tx_info[index]; |
| 660 | tx_info->skb = skb; |
| 661 | tx_info->nr_txbb = nr_txbb; |
| 662 | |
| 663 | /* Prepare ctrl segement apart opcode+ownership, which depends on |
| 664 | * whether LSO is used */ |
| 665 | tx_desc->ctrl.vlan_tag = cpu_to_be16(vlan_tag); |
| 666 | tx_desc->ctrl.ins_vlan = MLX4_WQE_CTRL_INS_VLAN * !!vlan_tag; |
| 667 | tx_desc->ctrl.fence_size = (real_size / 16) & 0x3f; |
| 668 | tx_desc->ctrl.srcrb_flags = cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE | |
| 669 | MLX4_WQE_CTRL_SOLICITED); |
| 670 | if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) { |
| 671 | tx_desc->ctrl.srcrb_flags |= cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM | |
| 672 | MLX4_WQE_CTRL_TCP_UDP_CSUM); |
| 673 | priv->port_stats.tx_chksum_offload++; |
| 674 | } |
| 675 | |
| 676 | /* Handle LSO (TSO) packets */ |
| 677 | if (lso_header_size) { |
| 678 | /* Mark opcode as LSO */ |
| 679 | op_own = cpu_to_be32(MLX4_OPCODE_LSO | (1 << 6)) | |
| 680 | ((ring->prod & ring->size) ? |
| 681 | cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0); |
| 682 | |
| 683 | /* Fill in the LSO prefix */ |
| 684 | tx_desc->lso.mss_hdr_size = cpu_to_be32( |
| 685 | skb_shinfo(skb)->gso_size << 16 | lso_header_size); |
| 686 | |
| 687 | /* Copy headers; |
| 688 | * note that we already verified that it is linear */ |
| 689 | memcpy(tx_desc->lso.header, skb->data, lso_header_size); |
| 690 | data = ((void *) &tx_desc->lso + |
| 691 | ALIGN(lso_header_size + 4, DS_SIZE)); |
| 692 | |
| 693 | priv->port_stats.tso_packets++; |
| 694 | i = ((skb->len - lso_header_size) / skb_shinfo(skb)->gso_size) + |
| 695 | !!((skb->len - lso_header_size) % skb_shinfo(skb)->gso_size); |
| 696 | ring->bytes += skb->len + (i - 1) * lso_header_size; |
| 697 | ring->packets += i; |
| 698 | } else { |
| 699 | /* Normal (Non LSO) packet */ |
| 700 | op_own = cpu_to_be32(MLX4_OPCODE_SEND) | |
| 701 | ((ring->prod & ring->size) ? |
| 702 | cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0); |
| 703 | data = &tx_desc->data; |
| 704 | ring->bytes += max(skb->len, (unsigned int) ETH_ZLEN); |
| 705 | ring->packets++; |
| 706 | |
| 707 | } |
| 708 | AVG_PERF_COUNTER(priv->pstats.tx_pktsz_avg, skb->len); |
| 709 | |
| 710 | |
| 711 | /* valid only for none inline segments */ |
| 712 | tx_info->data_offset = (void *) data - (void *) tx_desc; |
| 713 | |
| 714 | tx_info->linear = (lso_header_size < skb_headlen(skb) && !is_inline(skb, NULL)) ? 1 : 0; |
| 715 | data += skb_shinfo(skb)->nr_frags + tx_info->linear - 1; |
| 716 | |
| 717 | if (!is_inline(skb, &fragptr)) { |
| 718 | /* Map fragments */ |
| 719 | for (i = skb_shinfo(skb)->nr_frags - 1; i >= 0; i--) { |
| 720 | frag = &skb_shinfo(skb)->frags[i]; |
| 721 | dma = pci_map_page(mdev->dev->pdev, frag->page, frag->page_offset, |
| 722 | frag->size, PCI_DMA_TODEVICE); |
| 723 | data->addr = cpu_to_be64(dma); |
| 724 | data->lkey = cpu_to_be32(mdev->mr.key); |
| 725 | wmb(); |
| 726 | data->byte_count = cpu_to_be32(frag->size); |
| 727 | --data; |
| 728 | } |
| 729 | |
| 730 | /* Map linear part */ |
| 731 | if (tx_info->linear) { |
| 732 | dma = pci_map_single(mdev->dev->pdev, skb->data + lso_header_size, |
| 733 | skb_headlen(skb) - lso_header_size, PCI_DMA_TODEVICE); |
| 734 | data->addr = cpu_to_be64(dma); |
| 735 | data->lkey = cpu_to_be32(mdev->mr.key); |
| 736 | wmb(); |
| 737 | data->byte_count = cpu_to_be32(skb_headlen(skb) - lso_header_size); |
| 738 | } |
Yevgeny Petrilin | 41efea5 | 2009-01-08 10:57:15 -0800 | [diff] [blame] | 739 | tx_info->inl = 0; |
| 740 | } else { |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 741 | build_inline_wqe(tx_desc, skb, real_size, &vlan_tag, tx_ind, fragptr); |
Yevgeny Petrilin | 41efea5 | 2009-01-08 10:57:15 -0800 | [diff] [blame] | 742 | tx_info->inl = 1; |
| 743 | } |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 744 | |
| 745 | ring->prod += nr_txbb; |
| 746 | |
| 747 | /* If we used a bounce buffer then copy descriptor back into place */ |
| 748 | if (tx_desc == (struct mlx4_en_tx_desc *) ring->bounce_buf) |
| 749 | tx_desc = mlx4_en_bounce_to_desc(priv, ring, index, desc_size); |
| 750 | |
| 751 | /* Run destructor before passing skb to HW */ |
| 752 | if (likely(!skb_shared(skb))) |
| 753 | skb_orphan(skb); |
| 754 | |
| 755 | /* Ensure new descirptor hits memory |
| 756 | * before setting ownership of this descriptor to HW */ |
| 757 | wmb(); |
| 758 | tx_desc->ctrl.owner_opcode = op_own; |
| 759 | |
| 760 | /* Ring doorbell! */ |
| 761 | wmb(); |
| 762 | writel(ring->doorbell_qpn, mdev->uar_map + MLX4_SEND_DOORBELL); |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 763 | |
| 764 | /* Poll CQ here */ |
| 765 | mlx4_en_xmit_poll(priv, tx_ind); |
| 766 | |
Patrick McHardy | ec634fe | 2009-07-05 19:23:38 -0700 | [diff] [blame] | 767 | return NETDEV_TX_OK; |
Yevgeny Petrilin | 7e23091 | 2009-06-20 22:15:31 +0000 | [diff] [blame] | 768 | |
| 769 | tx_drop: |
| 770 | dev_kfree_skb_any(skb); |
| 771 | priv->stats.tx_dropped++; |
| 772 | return NETDEV_TX_OK; |
Yevgeny Petrilin | c27a02c | 2008-10-22 15:47:49 -0700 | [diff] [blame] | 773 | } |
| 774 | |