mlx4: Move the Mellanox driver

Moves the Mellanox driver into drivers/net/ethernet/mellanox/ and
make the necessary Kconfig and Makefile changes.

CC: Roland Dreier <roland@kernel.org>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 0 insertions, 828 deletions

diff --git a/drivers/net/mlx4/en_tx.c b/drivers/net/mlx4/en_tx.c
deleted file mode 100644
index 6e03de0..0000000
--- a/drivers/net/mlx4/en_tx.c
+++ /dev/null
@@ -1,828 +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 */
-	MAX_BF = 256,
-};
-
-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, int qpn, 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);
-
-	ring->qpn = qpn;
-	err = mlx4_qp_alloc(mdev->dev, ring->qpn, &ring->qp);
-	if (err) {
-		en_err(priv, "Failed allocating qp %d\n", ring->qpn);
-		goto err_map;
-	}
-	ring->qp.event = mlx4_en_sqp_event;
-
-	err = mlx4_bf_alloc(mdev->dev, &ring->bf);
-	if (err) {
-		en_dbg(DRV, priv, "working without blueflame (%d)", err);
-		ring->bf.uar = &mdev->priv_uar;
-		ring->bf.uar->map = mdev->uar_map;
-		ring->bf_enabled = false;
-	} else
-		ring->bf_enabled = true;
-
-	return 0;
-
-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);
-
-	if (ring->bf_enabled)
-		mlx4_bf_free(mdev->dev, &ring->bf);
-	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);
-	if (ring->bf_enabled)
-		ring->context.usr_page = cpu_to_be32(ring->bf.uar->index);
-
-	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 = 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 = 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);
-}
-
-static void mlx4_bf_copy(unsigned long *dst, unsigned long *src, unsigned bytecnt)
-{
-	__iowrite64_copy(dst, src, bytecnt / 8);
-}
-
-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, bf_index;
-	__be32 op_own;
-	u16 vlan_tag = 0;
-	int i;
-	int lso_header_size;
-	void *fragptr;
-	bool bounce = false;
-
-	if (!priv->port_up)
-		goto tx_drop;
-
-	real_size = get_real_size(skb, dev, &lso_header_size);
-	if (unlikely(!real_size))
-		goto tx_drop;
-
-	/* Align 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;
-	bf_index = ring->prod;
-
-	/* 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;
-		bounce = true;
-	}
-
-	/* 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 (bounce)
-		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);
-
-	if (ring->bf_enabled && desc_size <= MAX_BF && !bounce && !vlan_tag) {
-		*(u32 *) (&tx_desc->ctrl.vlan_tag) |= ring->doorbell_qpn;
-		op_own |= htonl((bf_index & 0xffff) << 8);
-		/* Ensure new descirptor hits memory
-		* before setting ownership of this descriptor to HW */
-		wmb();
-		tx_desc->ctrl.owner_opcode = op_own;
-
-		wmb();
-
-		mlx4_bf_copy(ring->bf.reg + ring->bf.offset, (unsigned long *) &tx_desc->ctrl,
-		     desc_size);
-
-		wmb();
-
-		ring->bf.offset ^= ring->bf.buf_size;
-	} else {
-		/* Ensure new descirptor hits memory
-		* before setting ownership of this descriptor to HW */
-		wmb();
-		tx_desc->ctrl.owner_opcode = op_own;
-		wmb();
-		writel(ring->doorbell_qpn, ring->bf.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;
-}
-