diff options
Diffstat (limited to 'drivers/net/mlx4/en_tx.c')
| -rw-r--r-- | drivers/net/mlx4/en_tx.c | 797 |
1 files changed, 0 insertions, 797 deletions
diff --git a/drivers/net/mlx4/en_tx.c b/drivers/net/mlx4/en_tx.c deleted file mode 100644 index a680cd4a5ab..00000000000 --- a/drivers/net/mlx4/en_tx.c +++ /dev/null @@ -1,797 +0,0 @@ -/* - * Copyright (c) 2007 Mellanox Technologies. All rights reserved. - * - * This software is available to you under a choice of one of two - * licenses. You may choose to be licensed under the terms of the GNU - * General Public License (GPL) Version 2, available from the file - * COPYING in the main directory of this source tree, or the - * OpenIB.org BSD license below: - * - * Redistribution and use in source and binary forms, with or - * without modification, are permitted provided that the following - * conditions are met: - * - * - Redistributions of source code must retain the above - * copyright notice, this list of conditions and the following - * disclaimer. - * - * - Redistributions in binary form must reproduce the above - * copyright notice, this list of conditions and the following - * disclaimer in the documentation and/or other materials - * provided with the distribution. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, - * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF - * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND - * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS - * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN - * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN - * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE - * SOFTWARE. - * - */ - -#include <asm/page.h> -#include <linux/mlx4/cq.h> -#include <linux/slab.h> -#include <linux/mlx4/qp.h> -#include <linux/skbuff.h> -#include <linux/if_vlan.h> -#include <linux/vmalloc.h> -#include <linux/tcp.h> - -#include "mlx4_en.h" - -enum { - MAX_INLINE = 104, /* 128 - 16 - 4 - 4 */ -}; - -static int inline_thold __read_mostly = MAX_INLINE; - -module_param_named(inline_thold, inline_thold, int, 0444); -MODULE_PARM_DESC(inline_thold, "threshold for using inline data"); - -int mlx4_en_create_tx_ring(struct mlx4_en_priv *priv, - struct mlx4_en_tx_ring *ring, u32 size, - u16 stride) -{ - struct mlx4_en_dev *mdev = priv->mdev; - int tmp; - int err; - - ring->size = size; - ring->size_mask = size - 1; - ring->stride = stride; - - inline_thold = min(inline_thold, MAX_INLINE); - - spin_lock_init(&ring->comp_lock); - - tmp = size * sizeof(struct mlx4_en_tx_info); - ring->tx_info = vmalloc(tmp); - if (!ring->tx_info) { - en_err(priv, "Failed allocating tx_info ring\n"); - return -ENOMEM; - } - en_dbg(DRV, priv, "Allocated tx_info ring at addr:%p size:%d\n", - ring->tx_info, tmp); - - ring->bounce_buf = kmalloc(MAX_DESC_SIZE, GFP_KERNEL); - if (!ring->bounce_buf) { - en_err(priv, "Failed allocating bounce buffer\n"); - err = -ENOMEM; - goto err_tx; - } - ring->buf_size = ALIGN(size * ring->stride, MLX4_EN_PAGE_SIZE); - - err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres, ring->buf_size, - 2 * PAGE_SIZE); - if (err) { - en_err(priv, "Failed allocating hwq resources\n"); - goto err_bounce; - } - - err = mlx4_en_map_buffer(&ring->wqres.buf); - if (err) { - en_err(priv, "Failed to map TX buffer\n"); - goto err_hwq_res; - } - - ring->buf = ring->wqres.buf.direct.buf; - - en_dbg(DRV, priv, "Allocated TX ring (addr:%p) - buf:%p size:%d " - "buf_size:%d dma:%llx\n", ring, ring->buf, ring->size, - ring->buf_size, (unsigned long long) ring->wqres.buf.direct.map); - - err = mlx4_qp_reserve_range(mdev->dev, 1, 1, &ring->qpn); - if (err) { - en_err(priv, "Failed reserving qp for tx ring.\n"); - goto err_map; - } - - err = mlx4_qp_alloc(mdev->dev, ring->qpn, &ring->qp); - if (err) { - en_err(priv, "Failed allocating qp %d\n", ring->qpn); - goto err_reserve; - } - ring->qp.event = mlx4_en_sqp_event; - - return 0; - -err_reserve: - mlx4_qp_release_range(mdev->dev, ring->qpn, 1); -err_map: - mlx4_en_unmap_buffer(&ring->wqres.buf); -err_hwq_res: - mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size); -err_bounce: - kfree(ring->bounce_buf); - ring->bounce_buf = NULL; -err_tx: - vfree(ring->tx_info); - ring->tx_info = NULL; - return err; -} - -void mlx4_en_destroy_tx_ring(struct mlx4_en_priv *priv, - struct mlx4_en_tx_ring *ring) -{ - struct mlx4_en_dev *mdev = priv->mdev; - en_dbg(DRV, priv, "Destroying tx ring, qpn: %d\n", ring->qpn); - - mlx4_qp_remove(mdev->dev, &ring->qp); - mlx4_qp_free(mdev->dev, &ring->qp); - mlx4_qp_release_range(mdev->dev, ring->qpn, 1); - mlx4_en_unmap_buffer(&ring->wqres.buf); - mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size); - kfree(ring->bounce_buf); - ring->bounce_buf = NULL; - vfree(ring->tx_info); - ring->tx_info = NULL; -} - -int mlx4_en_activate_tx_ring(struct mlx4_en_priv *priv, - struct mlx4_en_tx_ring *ring, - int cq) -{ - struct mlx4_en_dev *mdev = priv->mdev; - int err; - - ring->cqn = cq; - ring->prod = 0; - ring->cons = 0xffffffff; - ring->last_nr_txbb = 1; - ring->poll_cnt = 0; - ring->blocked = 0; - memset(ring->tx_info, 0, ring->size * sizeof(struct mlx4_en_tx_info)); - memset(ring->buf, 0, ring->buf_size); - - ring->qp_state = MLX4_QP_STATE_RST; - ring->doorbell_qpn = swab32(ring->qp.qpn << 8); - - mlx4_en_fill_qp_context(priv, ring->size, ring->stride, 1, 0, ring->qpn, - ring->cqn, &ring->context); - - err = mlx4_qp_to_ready(mdev->dev, &ring->wqres.mtt, &ring->context, - &ring->qp, &ring->qp_state); - - return err; -} - -void mlx4_en_deactivate_tx_ring(struct mlx4_en_priv *priv, - struct mlx4_en_tx_ring *ring) -{ - struct mlx4_en_dev *mdev = priv->mdev; - - mlx4_qp_modify(mdev->dev, NULL, ring->qp_state, - MLX4_QP_STATE_RST, NULL, 0, 0, &ring->qp); -} - - -static u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv, - struct mlx4_en_tx_ring *ring, - int index, u8 owner) -{ - struct mlx4_en_dev *mdev = priv->mdev; - struct mlx4_en_tx_info *tx_info = &ring->tx_info[index]; - struct mlx4_en_tx_desc *tx_desc = ring->buf + index * TXBB_SIZE; - struct mlx4_wqe_data_seg *data = (void *) tx_desc + tx_info->data_offset; - struct sk_buff *skb = tx_info->skb; - struct skb_frag_struct *frag; - void *end = ring->buf + ring->buf_size; - int frags = skb_shinfo(skb)->nr_frags; - int i; - __be32 *ptr = (__be32 *)tx_desc; - __be32 stamp = cpu_to_be32(STAMP_VAL | (!!owner << STAMP_SHIFT)); - - /* Optimize the common case when there are no wraparounds */ - if (likely((void *) tx_desc + tx_info->nr_txbb * TXBB_SIZE <= end)) { - if (!tx_info->inl) { - if (tx_info->linear) { - pci_unmap_single(mdev->pdev, - (dma_addr_t) be64_to_cpu(data->addr), - be32_to_cpu(data->byte_count), - PCI_DMA_TODEVICE); - ++data; - } - - for (i = 0; i < frags; i++) { - frag = &skb_shinfo(skb)->frags[i]; - pci_unmap_page(mdev->pdev, - (dma_addr_t) be64_to_cpu(data[i].addr), - frag->size, PCI_DMA_TODEVICE); - } - } - /* Stamp the freed descriptor */ - for (i = 0; i < tx_info->nr_txbb * TXBB_SIZE; i += STAMP_STRIDE) { - *ptr = stamp; - ptr += STAMP_DWORDS; - } - - } else { - if (!tx_info->inl) { - if ((void *) data >= end) { - data = (struct mlx4_wqe_data_seg *) - (ring->buf + ((void *) data - end)); - } - - if (tx_info->linear) { - pci_unmap_single(mdev->pdev, - (dma_addr_t) be64_to_cpu(data->addr), - be32_to_cpu(data->byte_count), - PCI_DMA_TODEVICE); - ++data; - } - - for (i = 0; i < frags; i++) { - /* Check for wraparound before unmapping */ - if ((void *) data >= end) - data = (struct mlx4_wqe_data_seg *) ring->buf; - frag = &skb_shinfo(skb)->frags[i]; - pci_unmap_page(mdev->pdev, - (dma_addr_t) be64_to_cpu(data->addr), - frag->size, PCI_DMA_TODEVICE); - ++data; - } - } - /* Stamp the freed descriptor */ - for (i = 0; i < tx_info->nr_txbb * TXBB_SIZE; i += STAMP_STRIDE) { - *ptr = stamp; - ptr += STAMP_DWORDS; - if ((void *) ptr >= end) { - ptr = ring->buf; - stamp ^= cpu_to_be32(0x80000000); - } - } - - } - dev_kfree_skb_any(skb); - return tx_info->nr_txbb; -} - - -int mlx4_en_free_tx_buf(struct net_device *dev, struct mlx4_en_tx_ring *ring) -{ - struct mlx4_en_priv *priv = netdev_priv(dev); - int cnt = 0; - - /* Skip last polled descriptor */ - ring->cons += ring->last_nr_txbb; - en_dbg(DRV, priv, "Freeing Tx buf - cons:0x%x prod:0x%x\n", - ring->cons, ring->prod); - - if ((u32) (ring->prod - ring->cons) > ring->size) { - if (netif_msg_tx_err(priv)) - en_warn(priv, "Tx consumer passed producer!\n"); - return 0; - } - - while (ring->cons != ring->prod) { - ring->last_nr_txbb = mlx4_en_free_tx_desc(priv, ring, - ring->cons & ring->size_mask, - !!(ring->cons & ring->size)); - ring->cons += ring->last_nr_txbb; - cnt++; - } - - if (cnt) - en_dbg(DRV, priv, "Freed %d uncompleted tx descriptors\n", cnt); - - return cnt; -} - - -static void mlx4_en_process_tx_cq(struct net_device *dev, struct mlx4_en_cq *cq) -{ - struct mlx4_en_priv *priv = netdev_priv(dev); - struct mlx4_cq *mcq = &cq->mcq; - struct mlx4_en_tx_ring *ring = &priv->tx_ring[cq->ring]; - struct mlx4_cqe *cqe = cq->buf; - u16 index; - u16 new_index; - u32 txbbs_skipped = 0; - u32 cq_last_sav; - - /* index always points to the first TXBB of the last polled descriptor */ - index = ring->cons & ring->size_mask; - new_index = be16_to_cpu(cqe->wqe_index) & ring->size_mask; - if (index == new_index) - return; - - if (!priv->port_up) - return; - - /* - * We use a two-stage loop: - * - the first samples the HW-updated CQE - * - the second frees TXBBs until the last sample - * This lets us amortize CQE cache misses, while still polling the CQ - * until is quiescent. - */ - cq_last_sav = mcq->cons_index; - do { - do { - /* Skip over last polled CQE */ - index = (index + ring->last_nr_txbb) & ring->size_mask; - txbbs_skipped += ring->last_nr_txbb; - - /* Poll next CQE */ - ring->last_nr_txbb = mlx4_en_free_tx_desc( - priv, ring, index, - !!((ring->cons + txbbs_skipped) & - ring->size)); - ++mcq->cons_index; - - } while (index != new_index); - - new_index = be16_to_cpu(cqe->wqe_index) & ring->size_mask; - } while (index != new_index); - AVG_PERF_COUNTER(priv->pstats.tx_coal_avg, - (u32) (mcq->cons_index - cq_last_sav)); - - /* - * To prevent CQ overflow we first update CQ consumer and only then - * the ring consumer. - */ - mlx4_cq_set_ci(mcq); - wmb(); - ring->cons += txbbs_skipped; - - /* Wakeup Tx queue if this ring stopped it */ - if (unlikely(ring->blocked)) { - if ((u32) (ring->prod - ring->cons) <= - ring->size - HEADROOM - MAX_DESC_TXBBS) { - ring->blocked = 0; - netif_tx_wake_queue(netdev_get_tx_queue(dev, cq->ring)); - priv->port_stats.wake_queue++; - } - } -} - -void mlx4_en_tx_irq(struct mlx4_cq *mcq) -{ - struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq); - struct mlx4_en_priv *priv = netdev_priv(cq->dev); - struct mlx4_en_tx_ring *ring = &priv->tx_ring[cq->ring]; - - if (!spin_trylock(&ring->comp_lock)) - return; - mlx4_en_process_tx_cq(cq->dev, cq); - mod_timer(&cq->timer, jiffies + 1); - spin_unlock(&ring->comp_lock); -} - - -void mlx4_en_poll_tx_cq(unsigned long data) -{ - struct mlx4_en_cq *cq = (struct mlx4_en_cq *) data; - struct mlx4_en_priv *priv = netdev_priv(cq->dev); - struct mlx4_en_tx_ring *ring = &priv->tx_ring[cq->ring]; - u32 inflight; - - INC_PERF_COUNTER(priv->pstats.tx_poll); - - if (!spin_trylock_irq(&ring->comp_lock)) { - mod_timer(&cq->timer, jiffies + MLX4_EN_TX_POLL_TIMEOUT); - return; - } - mlx4_en_process_tx_cq(cq->dev, cq); - inflight = (u32) (ring->prod - ring->cons - ring->last_nr_txbb); - - /* If there are still packets in flight and the timer has not already - * been scheduled by the Tx routine then schedule it here to guarantee - * completion processing of these packets */ - if (inflight && priv->port_up) - mod_timer(&cq->timer, jiffies + MLX4_EN_TX_POLL_TIMEOUT); - - spin_unlock_irq(&ring->comp_lock); -} - -static struct mlx4_en_tx_desc *mlx4_en_bounce_to_desc(struct mlx4_en_priv *priv, - struct mlx4_en_tx_ring *ring, - u32 index, - unsigned int desc_size) -{ - u32 copy = (ring->size - index) * TXBB_SIZE; - int i; - - for (i = desc_size - copy - 4; i >= 0; i -= 4) { - if ((i & (TXBB_SIZE - 1)) == 0) - wmb(); - - *((u32 *) (ring->buf + i)) = - *((u32 *) (ring->bounce_buf + copy + i)); - } - - for (i = copy - 4; i >= 4 ; i -= 4) { - if ((i & (TXBB_SIZE - 1)) == 0) - wmb(); - - *((u32 *) (ring->buf + index * TXBB_SIZE + i)) = - *((u32 *) (ring->bounce_buf + i)); - } - - /* Return real descriptor location */ - return ring->buf + index * TXBB_SIZE; -} - -static inline void mlx4_en_xmit_poll(struct mlx4_en_priv *priv, int tx_ind) -{ - struct mlx4_en_cq *cq = &priv->tx_cq[tx_ind]; - struct mlx4_en_tx_ring *ring = &priv->tx_ring[tx_ind]; - unsigned long flags; - - /* If we don't have a pending timer, set one up to catch our recent - post in case the interface becomes idle */ - if (!timer_pending(&cq->timer)) - mod_timer(&cq->timer, jiffies + MLX4_EN_TX_POLL_TIMEOUT); - - /* Poll the CQ every mlx4_en_TX_MODER_POLL packets */ - if ((++ring->poll_cnt & (MLX4_EN_TX_POLL_MODER - 1)) == 0) - if (spin_trylock_irqsave(&ring->comp_lock, flags)) { - mlx4_en_process_tx_cq(priv->dev, cq); - spin_unlock_irqrestore(&ring->comp_lock, flags); - } -} - -static void *get_frag_ptr(struct sk_buff *skb) -{ - struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[0]; - struct page *page = frag->page; - void *ptr; - - ptr = page_address(page); - if (unlikely(!ptr)) - return NULL; - - return ptr + frag->page_offset; -} - -static int is_inline(struct sk_buff *skb, void **pfrag) -{ - void *ptr; - - if (inline_thold && !skb_is_gso(skb) && skb->len <= inline_thold) { - if (skb_shinfo(skb)->nr_frags == 1) { - ptr = get_frag_ptr(skb); - if (unlikely(!ptr)) - return 0; - - if (pfrag) - *pfrag = ptr; - - return 1; - } else if (unlikely(skb_shinfo(skb)->nr_frags)) - return 0; - else - return 1; - } - - return 0; -} - -static int inline_size(struct sk_buff *skb) -{ - if (skb->len + CTRL_SIZE + sizeof(struct mlx4_wqe_inline_seg) - <= MLX4_INLINE_ALIGN) - return ALIGN(skb->len + CTRL_SIZE + - sizeof(struct mlx4_wqe_inline_seg), 16); - else - return ALIGN(skb->len + CTRL_SIZE + 2 * - sizeof(struct mlx4_wqe_inline_seg), 16); -} - -static int get_real_size(struct sk_buff *skb, struct net_device *dev, - int *lso_header_size) -{ - struct mlx4_en_priv *priv = netdev_priv(dev); - int real_size; - - if (skb_is_gso(skb)) { - *lso_header_size = skb_transport_offset(skb) + tcp_hdrlen(skb); - real_size = CTRL_SIZE + skb_shinfo(skb)->nr_frags * DS_SIZE + - ALIGN(*lso_header_size + 4, DS_SIZE); - if (unlikely(*lso_header_size != skb_headlen(skb))) { - /* We add a segment for the skb linear buffer only if - * it contains data */ - if (*lso_header_size < skb_headlen(skb)) - real_size += DS_SIZE; - else { - if (netif_msg_tx_err(priv)) - en_warn(priv, "Non-linear headers\n"); - return 0; - } - } - } else { - *lso_header_size = 0; - if (!is_inline(skb, NULL)) - real_size = CTRL_SIZE + (skb_shinfo(skb)->nr_frags + 1) * DS_SIZE; - else - real_size = inline_size(skb); - } - - return real_size; -} - -static void build_inline_wqe(struct mlx4_en_tx_desc *tx_desc, struct sk_buff *skb, - int real_size, u16 *vlan_tag, int tx_ind, void *fragptr) -{ - struct mlx4_wqe_inline_seg *inl = &tx_desc->inl; - int spc = MLX4_INLINE_ALIGN - CTRL_SIZE - sizeof *inl; - - if (skb->len <= spc) { - inl->byte_count = cpu_to_be32(1 << 31 | skb->len); - skb_copy_from_linear_data(skb, inl + 1, skb_headlen(skb)); - if (skb_shinfo(skb)->nr_frags) - memcpy(((void *)(inl + 1)) + skb_headlen(skb), fragptr, - skb_shinfo(skb)->frags[0].size); - - } else { - inl->byte_count = cpu_to_be32(1 << 31 | spc); - if (skb_headlen(skb) <= spc) { - skb_copy_from_linear_data(skb, inl + 1, skb_headlen(skb)); - if (skb_headlen(skb) < spc) { - memcpy(((void *)(inl + 1)) + skb_headlen(skb), - fragptr, spc - skb_headlen(skb)); - fragptr += spc - skb_headlen(skb); - } - inl = (void *) (inl + 1) + spc; - memcpy(((void *)(inl + 1)), fragptr, skb->len - spc); - } else { - skb_copy_from_linear_data(skb, inl + 1, spc); - inl = (void *) (inl + 1) + spc; - skb_copy_from_linear_data_offset(skb, spc, inl + 1, - skb_headlen(skb) - spc); - if (skb_shinfo(skb)->nr_frags) - memcpy(((void *)(inl + 1)) + skb_headlen(skb) - spc, - fragptr, skb_shinfo(skb)->frags[0].size); - } - - wmb(); - inl->byte_count = cpu_to_be32(1 << 31 | (skb->len - spc)); - } - tx_desc->ctrl.vlan_tag = cpu_to_be16(*vlan_tag); - tx_desc->ctrl.ins_vlan = MLX4_WQE_CTRL_INS_VLAN * !!(*vlan_tag); - tx_desc->ctrl.fence_size = (real_size / 16) & 0x3f; -} - -u16 mlx4_en_select_queue(struct net_device *dev, struct sk_buff *skb) -{ - struct mlx4_en_priv *priv = netdev_priv(dev); - u16 vlan_tag = 0; - - /* If we support per priority flow control and the packet contains - * a vlan tag, send the packet to the TX ring assigned to that priority - */ - if (priv->prof->rx_ppp && vlan_tx_tag_present(skb)) { - vlan_tag = vlan_tx_tag_get(skb); - return MLX4_EN_NUM_TX_RINGS + (vlan_tag >> 13); - } - - return skb_tx_hash(dev, skb); -} - -netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev) -{ - struct mlx4_en_priv *priv = netdev_priv(dev); - struct mlx4_en_dev *mdev = priv->mdev; - struct mlx4_en_tx_ring *ring; - struct mlx4_en_cq *cq; - struct mlx4_en_tx_desc *tx_desc; - struct mlx4_wqe_data_seg *data; - struct skb_frag_struct *frag; - struct mlx4_en_tx_info *tx_info; - struct ethhdr *ethh; - u64 mac; - u32 mac_l, mac_h; - int tx_ind = 0; - int nr_txbb; - int desc_size; - int real_size; - dma_addr_t dma; - u32 index; - __be32 op_own; - u16 vlan_tag = 0; - int i; - int lso_header_size; - void *fragptr; - - if (!priv->port_up) - goto tx_drop; - - real_size = get_real_size(skb, dev, &lso_header_size); - if (unlikely(!real_size)) - goto tx_drop; - - /* Allign descriptor to TXBB size */ - desc_size = ALIGN(real_size, TXBB_SIZE); - nr_txbb = desc_size / TXBB_SIZE; - if (unlikely(nr_txbb > MAX_DESC_TXBBS)) { - if (netif_msg_tx_err(priv)) - en_warn(priv, "Oversized header or SG list\n"); - goto tx_drop; - } - - tx_ind = skb->queue_mapping; - ring = &priv->tx_ring[tx_ind]; - if (vlan_tx_tag_present(skb)) - vlan_tag = vlan_tx_tag_get(skb); - - /* Check available TXBBs And 2K spare for prefetch */ - if (unlikely(((int)(ring->prod - ring->cons)) > - ring->size - HEADROOM - MAX_DESC_TXBBS)) { - /* every full Tx ring stops queue */ - netif_tx_stop_queue(netdev_get_tx_queue(dev, tx_ind)); - ring->blocked = 1; - priv->port_stats.queue_stopped++; - - /* Use interrupts to find out when queue opened */ - cq = &priv->tx_cq[tx_ind]; - mlx4_en_arm_cq(priv, cq); - return NETDEV_TX_BUSY; - } - - /* Track current inflight packets for performance analysis */ - AVG_PERF_COUNTER(priv->pstats.inflight_avg, - (u32) (ring->prod - ring->cons - 1)); - - /* Packet is good - grab an index and transmit it */ - index = ring->prod & ring->size_mask; - - /* See if we have enough space for whole descriptor TXBB for setting - * SW ownership on next descriptor; if not, use a bounce buffer. */ - if (likely(index + nr_txbb <= ring->size)) - tx_desc = ring->buf + index * TXBB_SIZE; - else - tx_desc = (struct mlx4_en_tx_desc *) ring->bounce_buf; - - /* Save skb in tx_info ring */ - tx_info = &ring->tx_info[index]; - tx_info->skb = skb; - tx_info->nr_txbb = nr_txbb; - - /* Prepare ctrl segement apart opcode+ownership, which depends on - * whether LSO is used */ - tx_desc->ctrl.vlan_tag = cpu_to_be16(vlan_tag); - tx_desc->ctrl.ins_vlan = MLX4_WQE_CTRL_INS_VLAN * !!vlan_tag; - tx_desc->ctrl.fence_size = (real_size / 16) & 0x3f; - tx_desc->ctrl.srcrb_flags = cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE | - MLX4_WQE_CTRL_SOLICITED); - if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) { - tx_desc->ctrl.srcrb_flags |= cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM | - MLX4_WQE_CTRL_TCP_UDP_CSUM); - priv->port_stats.tx_chksum_offload++; - } - - if (unlikely(priv->validate_loopback)) { - /* Copy dst mac address to wqe */ - skb_reset_mac_header(skb); - ethh = eth_hdr(skb); - if (ethh && ethh->h_dest) { - mac = mlx4_en_mac_to_u64(ethh->h_dest); - mac_h = (u32) ((mac & 0xffff00000000ULL) >> 16); - mac_l = (u32) (mac & 0xffffffff); - tx_desc->ctrl.srcrb_flags |= cpu_to_be32(mac_h); - tx_desc->ctrl.imm = cpu_to_be32(mac_l); - } - } - - /* Handle LSO (TSO) packets */ - if (lso_header_size) { - /* Mark opcode as LSO */ - op_own = cpu_to_be32(MLX4_OPCODE_LSO | (1 << 6)) | - ((ring->prod & ring->size) ? - cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0); - - /* Fill in the LSO prefix */ - tx_desc->lso.mss_hdr_size = cpu_to_be32( - skb_shinfo(skb)->gso_size << 16 | lso_header_size); - - /* Copy headers; - * note that we already verified that it is linear */ - memcpy(tx_desc->lso.header, skb->data, lso_header_size); - data = ((void *) &tx_desc->lso + - ALIGN(lso_header_size + 4, DS_SIZE)); - - priv->port_stats.tso_packets++; - i = ((skb->len - lso_header_size) / skb_shinfo(skb)->gso_size) + - !!((skb->len - lso_header_size) % skb_shinfo(skb)->gso_size); - ring->bytes += skb->len + (i - 1) * lso_header_size; - ring->packets += i; - } else { - /* Normal (Non LSO) packet */ - op_own = cpu_to_be32(MLX4_OPCODE_SEND) | - ((ring->prod & ring->size) ? - cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0); - data = &tx_desc->data; - ring->bytes += max(skb->len, (unsigned int) ETH_ZLEN); - ring->packets++; - - } - AVG_PERF_COUNTER(priv->pstats.tx_pktsz_avg, skb->len); - - - /* valid only for none inline segments */ - tx_info->data_offset = (void *) data - (void *) tx_desc; - - tx_info->linear = (lso_header_size < skb_headlen(skb) && !is_inline(skb, NULL)) ? 1 : 0; - data += skb_shinfo(skb)->nr_frags + tx_info->linear - 1; - - if (!is_inline(skb, &fragptr)) { - /* Map fragments */ - for (i = skb_shinfo(skb)->nr_frags - 1; i >= 0; i--) { - frag = &skb_shinfo(skb)->frags[i]; - dma = pci_map_page(mdev->dev->pdev, frag->page, frag->page_offset, - frag->size, PCI_DMA_TODEVICE); - data->addr = cpu_to_be64(dma); - data->lkey = cpu_to_be32(mdev->mr.key); - wmb(); - data->byte_count = cpu_to_be32(frag->size); - --data; - } - - /* Map linear part */ - if (tx_info->linear) { - dma = pci_map_single(mdev->dev->pdev, skb->data + lso_header_size, - skb_headlen(skb) - lso_header_size, PCI_DMA_TODEVICE); - data->addr = cpu_to_be64(dma); - data->lkey = cpu_to_be32(mdev->mr.key); - wmb(); - data->byte_count = cpu_to_be32(skb_headlen(skb) - lso_header_size); - } - tx_info->inl = 0; - } else { - build_inline_wqe(tx_desc, skb, real_size, &vlan_tag, tx_ind, fragptr); - tx_info->inl = 1; - } - - ring->prod += nr_txbb; - - /* If we used a bounce buffer then copy descriptor back into place */ - if (tx_desc == (struct mlx4_en_tx_desc *) ring->bounce_buf) - tx_desc = mlx4_en_bounce_to_desc(priv, ring, index, desc_size); - - /* Run destructor before passing skb to HW */ - if (likely(!skb_shared(skb))) - skb_orphan(skb); - - /* Ensure new descirptor hits memory - * before setting ownership of this descriptor to HW */ - wmb(); - tx_desc->ctrl.owner_opcode = op_own; - - /* Ring doorbell! */ - wmb(); - writel(ring->doorbell_qpn, mdev->uar_map + MLX4_SEND_DOORBELL); - - /* Poll CQ here */ - mlx4_en_xmit_poll(priv, tx_ind); - - return NETDEV_TX_OK; - -tx_drop: - dev_kfree_skb_any(skb); - priv->stats.tx_dropped++; - return NETDEV_TX_OK; -} - |