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Diffstat (limited to 'drivers/net/mlx4/en_rx.c')
-rw-r--r--drivers/net/mlx4/en_rx.c918
1 files changed, 0 insertions, 918 deletions
diff --git a/drivers/net/mlx4/en_rx.c b/drivers/net/mlx4/en_rx.c
deleted file mode 100644
index 37cc9e5..0000000
--- a/drivers/net/mlx4/en_rx.c
+++ /dev/null
@@ -1,918 +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 <linux/mlx4/cq.h>
-#include <linux/slab.h>
-#include <linux/mlx4/qp.h>
-#include <linux/skbuff.h>
-#include <linux/if_ether.h>
-#include <linux/if_vlan.h>
-#include <linux/vmalloc.h>
-
-#include "mlx4_en.h"
-
-
-static int mlx4_en_alloc_frag(struct mlx4_en_priv *priv,
- struct mlx4_en_rx_desc *rx_desc,
- struct skb_frag_struct *skb_frags,
- struct mlx4_en_rx_alloc *ring_alloc,
- int i)
-{
- struct mlx4_en_dev *mdev = priv->mdev;
- struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];
- struct mlx4_en_rx_alloc *page_alloc = &ring_alloc[i];
- struct page *page;
- dma_addr_t dma;
-
- if (page_alloc->offset == frag_info->last_offset) {
- /* Allocate new page */
- page = alloc_pages(GFP_ATOMIC | __GFP_COMP, MLX4_EN_ALLOC_ORDER);
- if (!page)
- return -ENOMEM;
-
- skb_frags[i].page = page_alloc->page;
- skb_frags[i].page_offset = page_alloc->offset;
- page_alloc->page = page;
- page_alloc->offset = frag_info->frag_align;
- } else {
- page = page_alloc->page;
- get_page(page);
-
- skb_frags[i].page = page;
- skb_frags[i].page_offset = page_alloc->offset;
- page_alloc->offset += frag_info->frag_stride;
- }
- dma = pci_map_single(mdev->pdev, page_address(skb_frags[i].page) +
- skb_frags[i].page_offset, frag_info->frag_size,
- PCI_DMA_FROMDEVICE);
- rx_desc->data[i].addr = cpu_to_be64(dma);
- return 0;
-}
-
-static int mlx4_en_init_allocator(struct mlx4_en_priv *priv,
- struct mlx4_en_rx_ring *ring)
-{
- struct mlx4_en_rx_alloc *page_alloc;
- int i;
-
- for (i = 0; i < priv->num_frags; i++) {
- page_alloc = &ring->page_alloc[i];
- page_alloc->page = alloc_pages(GFP_ATOMIC | __GFP_COMP,
- MLX4_EN_ALLOC_ORDER);
- if (!page_alloc->page)
- goto out;
-
- page_alloc->offset = priv->frag_info[i].frag_align;
- en_dbg(DRV, priv, "Initialized allocator:%d with page:%p\n",
- i, page_alloc->page);
- }
- return 0;
-
-out:
- while (i--) {
- page_alloc = &ring->page_alloc[i];
- put_page(page_alloc->page);
- page_alloc->page = NULL;
- }
- return -ENOMEM;
-}
-
-static void mlx4_en_destroy_allocator(struct mlx4_en_priv *priv,
- struct mlx4_en_rx_ring *ring)
-{
- struct mlx4_en_rx_alloc *page_alloc;
- int i;
-
- for (i = 0; i < priv->num_frags; i++) {
- page_alloc = &ring->page_alloc[i];
- en_dbg(DRV, priv, "Freeing allocator:%d count:%d\n",
- i, page_count(page_alloc->page));
-
- put_page(page_alloc->page);
- page_alloc->page = NULL;
- }
-}
-
-
-static void mlx4_en_init_rx_desc(struct mlx4_en_priv *priv,
- struct mlx4_en_rx_ring *ring, int index)
-{
- struct mlx4_en_rx_desc *rx_desc = ring->buf + ring->stride * index;
- struct skb_frag_struct *skb_frags = ring->rx_info +
- (index << priv->log_rx_info);
- int possible_frags;
- int i;
-
- /* Set size and memtype fields */
- for (i = 0; i < priv->num_frags; i++) {
- skb_frags[i].size = priv->frag_info[i].frag_size;
- rx_desc->data[i].byte_count =
- cpu_to_be32(priv->frag_info[i].frag_size);
- rx_desc->data[i].lkey = cpu_to_be32(priv->mdev->mr.key);
- }
-
- /* If the number of used fragments does not fill up the ring stride,
- * remaining (unused) fragments must be padded with null address/size
- * and a special memory key */
- possible_frags = (ring->stride - sizeof(struct mlx4_en_rx_desc)) / DS_SIZE;
- for (i = priv->num_frags; i < possible_frags; i++) {
- rx_desc->data[i].byte_count = 0;
- rx_desc->data[i].lkey = cpu_to_be32(MLX4_EN_MEMTYPE_PAD);
- rx_desc->data[i].addr = 0;
- }
-}
-
-
-static int mlx4_en_prepare_rx_desc(struct mlx4_en_priv *priv,
- struct mlx4_en_rx_ring *ring, int index)
-{
- struct mlx4_en_rx_desc *rx_desc = ring->buf + (index * ring->stride);
- struct skb_frag_struct *skb_frags = ring->rx_info +
- (index << priv->log_rx_info);
- int i;
-
- for (i = 0; i < priv->num_frags; i++)
- if (mlx4_en_alloc_frag(priv, rx_desc, skb_frags, ring->page_alloc, i))
- goto err;
-
- return 0;
-
-err:
- while (i--)
- put_page(skb_frags[i].page);
- return -ENOMEM;
-}
-
-static inline void mlx4_en_update_rx_prod_db(struct mlx4_en_rx_ring *ring)
-{
- *ring->wqres.db.db = cpu_to_be32(ring->prod & 0xffff);
-}
-
-static void mlx4_en_free_rx_desc(struct mlx4_en_priv *priv,
- struct mlx4_en_rx_ring *ring,
- int index)
-{
- struct mlx4_en_dev *mdev = priv->mdev;
- struct skb_frag_struct *skb_frags;
- struct mlx4_en_rx_desc *rx_desc = ring->buf + (index << ring->log_stride);
- dma_addr_t dma;
- int nr;
-
- skb_frags = ring->rx_info + (index << priv->log_rx_info);
- for (nr = 0; nr < priv->num_frags; nr++) {
- en_dbg(DRV, priv, "Freeing fragment:%d\n", nr);
- dma = be64_to_cpu(rx_desc->data[nr].addr);
-
- en_dbg(DRV, priv, "Unmapping buffer at dma:0x%llx\n", (u64) dma);
- pci_unmap_single(mdev->pdev, dma, skb_frags[nr].size,
- PCI_DMA_FROMDEVICE);
- put_page(skb_frags[nr].page);
- }
-}
-
-static int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv)
-{
- struct mlx4_en_rx_ring *ring;
- int ring_ind;
- int buf_ind;
- int new_size;
-
- for (buf_ind = 0; buf_ind < priv->prof->rx_ring_size; buf_ind++) {
- for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
- ring = &priv->rx_ring[ring_ind];
-
- if (mlx4_en_prepare_rx_desc(priv, ring,
- ring->actual_size)) {
- if (ring->actual_size < MLX4_EN_MIN_RX_SIZE) {
- en_err(priv, "Failed to allocate "
- "enough rx buffers\n");
- return -ENOMEM;
- } else {
- new_size = rounddown_pow_of_two(ring->actual_size);
- en_warn(priv, "Only %d buffers allocated "
- "reducing ring size to %d",
- ring->actual_size, new_size);
- goto reduce_rings;
- }
- }
- ring->actual_size++;
- ring->prod++;
- }
- }
- return 0;
-
-reduce_rings:
- for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
- ring = &priv->rx_ring[ring_ind];
- while (ring->actual_size > new_size) {
- ring->actual_size--;
- ring->prod--;
- mlx4_en_free_rx_desc(priv, ring, ring->actual_size);
- }
- }
-
- return 0;
-}
-
-static void mlx4_en_free_rx_buf(struct mlx4_en_priv *priv,
- struct mlx4_en_rx_ring *ring)
-{
- int index;
-
- en_dbg(DRV, priv, "Freeing Rx buf - cons:%d prod:%d\n",
- ring->cons, ring->prod);
-
- /* Unmap and free Rx buffers */
- BUG_ON((u32) (ring->prod - ring->cons) > ring->actual_size);
- while (ring->cons != ring->prod) {
- index = ring->cons & ring->size_mask;
- en_dbg(DRV, priv, "Processing descriptor:%d\n", index);
- mlx4_en_free_rx_desc(priv, ring, index);
- ++ring->cons;
- }
-}
-
-int mlx4_en_create_rx_ring(struct mlx4_en_priv *priv,
- struct mlx4_en_rx_ring *ring, u32 size, u16 stride)
-{
- struct mlx4_en_dev *mdev = priv->mdev;
- int err;
- int tmp;
-
-
- ring->prod = 0;
- ring->cons = 0;
- ring->size = size;
- ring->size_mask = size - 1;
- ring->stride = stride;
- ring->log_stride = ffs(ring->stride) - 1;
- ring->buf_size = ring->size * ring->stride + TXBB_SIZE;
-
- tmp = size * roundup_pow_of_two(MLX4_EN_MAX_RX_FRAGS *
- sizeof(struct skb_frag_struct));
- ring->rx_info = vmalloc(tmp);
- if (!ring->rx_info) {
- en_err(priv, "Failed allocating rx_info ring\n");
- return -ENOMEM;
- }
- en_dbg(DRV, priv, "Allocated rx_info ring at addr:%p size:%d\n",
- ring->rx_info, tmp);
-
- err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres,
- ring->buf_size, 2 * PAGE_SIZE);
- if (err)
- goto err_ring;
-
- err = mlx4_en_map_buffer(&ring->wqres.buf);
- if (err) {
- en_err(priv, "Failed to map RX buffer\n");
- goto err_hwq;
- }
- ring->buf = ring->wqres.buf.direct.buf;
-
- return 0;
-
-err_hwq:
- mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
-err_ring:
- vfree(ring->rx_info);
- ring->rx_info = NULL;
- return err;
-}
-
-int mlx4_en_activate_rx_rings(struct mlx4_en_priv *priv)
-{
- struct mlx4_en_rx_ring *ring;
- int i;
- int ring_ind;
- int err;
- int stride = roundup_pow_of_two(sizeof(struct mlx4_en_rx_desc) +
- DS_SIZE * priv->num_frags);
-
- for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
- ring = &priv->rx_ring[ring_ind];
-
- ring->prod = 0;
- ring->cons = 0;
- ring->actual_size = 0;
- ring->cqn = priv->rx_cq[ring_ind].mcq.cqn;
-
- ring->stride = stride;
- if (ring->stride <= TXBB_SIZE)
- ring->buf += TXBB_SIZE;
-
- ring->log_stride = ffs(ring->stride) - 1;
- ring->buf_size = ring->size * ring->stride;
-
- memset(ring->buf, 0, ring->buf_size);
- mlx4_en_update_rx_prod_db(ring);
-
- /* Initailize all descriptors */
- for (i = 0; i < ring->size; i++)
- mlx4_en_init_rx_desc(priv, ring, i);
-
- /* Initialize page allocators */
- err = mlx4_en_init_allocator(priv, ring);
- if (err) {
- en_err(priv, "Failed initializing ring allocator\n");
- if (ring->stride <= TXBB_SIZE)
- ring->buf -= TXBB_SIZE;
- ring_ind--;
- goto err_allocator;
- }
- }
- err = mlx4_en_fill_rx_buffers(priv);
- if (err)
- goto err_buffers;
-
- for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
- ring = &priv->rx_ring[ring_ind];
-
- ring->size_mask = ring->actual_size - 1;
- mlx4_en_update_rx_prod_db(ring);
- }
-
- return 0;
-
-err_buffers:
- for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++)
- mlx4_en_free_rx_buf(priv, &priv->rx_ring[ring_ind]);
-
- ring_ind = priv->rx_ring_num - 1;
-err_allocator:
- while (ring_ind >= 0) {
- if (priv->rx_ring[ring_ind].stride <= TXBB_SIZE)
- priv->rx_ring[ring_ind].buf -= TXBB_SIZE;
- mlx4_en_destroy_allocator(priv, &priv->rx_ring[ring_ind]);
- ring_ind--;
- }
- return err;
-}
-
-void mlx4_en_destroy_rx_ring(struct mlx4_en_priv *priv,
- struct mlx4_en_rx_ring *ring)
-{
- struct mlx4_en_dev *mdev = priv->mdev;
-
- mlx4_en_unmap_buffer(&ring->wqres.buf);
- mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size + TXBB_SIZE);
- vfree(ring->rx_info);
- ring->rx_info = NULL;
-}
-
-void mlx4_en_deactivate_rx_ring(struct mlx4_en_priv *priv,
- struct mlx4_en_rx_ring *ring)
-{
- mlx4_en_free_rx_buf(priv, ring);
- if (ring->stride <= TXBB_SIZE)
- ring->buf -= TXBB_SIZE;
- mlx4_en_destroy_allocator(priv, ring);
-}
-
-
-/* Unmap a completed descriptor and free unused pages */
-static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
- struct mlx4_en_rx_desc *rx_desc,
- struct skb_frag_struct *skb_frags,
- struct skb_frag_struct *skb_frags_rx,
- struct mlx4_en_rx_alloc *page_alloc,
- int length)
-{
- struct mlx4_en_dev *mdev = priv->mdev;
- struct mlx4_en_frag_info *frag_info;
- int nr;
- dma_addr_t dma;
-
- /* Collect used fragments while replacing them in the HW descirptors */
- for (nr = 0; nr < priv->num_frags; nr++) {
- frag_info = &priv->frag_info[nr];
- if (length <= frag_info->frag_prefix_size)
- break;
-
- /* Save page reference in skb */
- skb_frags_rx[nr].page = skb_frags[nr].page;
- skb_frags_rx[nr].size = skb_frags[nr].size;
- skb_frags_rx[nr].page_offset = skb_frags[nr].page_offset;
- dma = be64_to_cpu(rx_desc->data[nr].addr);
-
- /* Allocate a replacement page */
- if (mlx4_en_alloc_frag(priv, rx_desc, skb_frags, page_alloc, nr))
- goto fail;
-
- /* Unmap buffer */
- pci_unmap_single(mdev->pdev, dma, skb_frags_rx[nr].size,
- PCI_DMA_FROMDEVICE);
- }
- /* Adjust size of last fragment to match actual length */
- if (nr > 0)
- skb_frags_rx[nr - 1].size = length -
- priv->frag_info[nr - 1].frag_prefix_size;
- return nr;
-
-fail:
- /* Drop all accumulated fragments (which have already been replaced in
- * the descriptor) of this packet; remaining fragments are reused... */
- while (nr > 0) {
- nr--;
- put_page(skb_frags_rx[nr].page);
- }
- return 0;
-}
-
-
-static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv,
- struct mlx4_en_rx_desc *rx_desc,
- struct skb_frag_struct *skb_frags,
- struct mlx4_en_rx_alloc *page_alloc,
- unsigned int length)
-{
- struct mlx4_en_dev *mdev = priv->mdev;
- struct sk_buff *skb;
- void *va;
- int used_frags;
- dma_addr_t dma;
-
- skb = dev_alloc_skb(SMALL_PACKET_SIZE + NET_IP_ALIGN);
- if (!skb) {
- en_dbg(RX_ERR, priv, "Failed allocating skb\n");
- return NULL;
- }
- skb->dev = priv->dev;
- skb_reserve(skb, NET_IP_ALIGN);
- skb->len = length;
- skb->truesize = length + sizeof(struct sk_buff);
-
- /* Get pointer to first fragment so we could copy the headers into the
- * (linear part of the) skb */
- va = page_address(skb_frags[0].page) + skb_frags[0].page_offset;
-
- if (length <= SMALL_PACKET_SIZE) {
- /* We are copying all relevant data to the skb - temporarily
- * synch buffers for the copy */
- dma = be64_to_cpu(rx_desc->data[0].addr);
- dma_sync_single_for_cpu(&mdev->pdev->dev, dma, length,
- DMA_FROM_DEVICE);
- skb_copy_to_linear_data(skb, va, length);
- dma_sync_single_for_device(&mdev->pdev->dev, dma, length,
- DMA_FROM_DEVICE);
- skb->tail += length;
- } else {
-
- /* Move relevant fragments to skb */
- used_frags = mlx4_en_complete_rx_desc(priv, rx_desc, skb_frags,
- skb_shinfo(skb)->frags,
- page_alloc, length);
- if (unlikely(!used_frags)) {
- kfree_skb(skb);
- return NULL;
- }
- skb_shinfo(skb)->nr_frags = used_frags;
-
- /* Copy headers into the skb linear buffer */
- memcpy(skb->data, va, HEADER_COPY_SIZE);
- skb->tail += HEADER_COPY_SIZE;
-
- /* Skip headers in first fragment */
- skb_shinfo(skb)->frags[0].page_offset += HEADER_COPY_SIZE;
-
- /* Adjust size of first fragment */
- skb_shinfo(skb)->frags[0].size -= HEADER_COPY_SIZE;
- skb->data_len = length - HEADER_COPY_SIZE;
- }
- return skb;
-}
-
-static void validate_loopback(struct mlx4_en_priv *priv, struct sk_buff *skb)
-{
- int i;
- int offset = ETH_HLEN;
-
- for (i = 0; i < MLX4_LOOPBACK_TEST_PAYLOAD; i++, offset++) {
- if (*(skb->data + offset) != (unsigned char) (i & 0xff))
- goto out_loopback;
- }
- /* Loopback found */
- priv->loopback_ok = 1;
-
-out_loopback:
- dev_kfree_skb_any(skb);
-}
-
-int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
-{
- struct mlx4_en_priv *priv = netdev_priv(dev);
- struct mlx4_cqe *cqe;
- struct mlx4_en_rx_ring *ring = &priv->rx_ring[cq->ring];
- struct skb_frag_struct *skb_frags;
- struct mlx4_en_rx_desc *rx_desc;
- struct sk_buff *skb;
- int index;
- int nr;
- unsigned int length;
- int polled = 0;
- int ip_summed;
-
- if (!priv->port_up)
- return 0;
-
- /* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx
- * descriptor offset can be deduced from the CQE index instead of
- * reading 'cqe->index' */
- index = cq->mcq.cons_index & ring->size_mask;
- cqe = &cq->buf[index];
-
- /* Process all completed CQEs */
- while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
- cq->mcq.cons_index & cq->size)) {
-
- skb_frags = ring->rx_info + (index << priv->log_rx_info);
- rx_desc = ring->buf + (index << ring->log_stride);
-
- /*
- * make sure we read the CQE after we read the ownership bit
- */
- rmb();
-
- /* Drop packet on bad receive or bad checksum */
- if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
- MLX4_CQE_OPCODE_ERROR)) {
- en_err(priv, "CQE completed in error - vendor "
- "syndrom:%d syndrom:%d\n",
- ((struct mlx4_err_cqe *) cqe)->vendor_err_syndrome,
- ((struct mlx4_err_cqe *) cqe)->syndrome);
- goto next;
- }
- if (unlikely(cqe->badfcs_enc & MLX4_CQE_BAD_FCS)) {
- en_dbg(RX_ERR, priv, "Accepted frame with bad FCS\n");
- goto next;
- }
-
- /*
- * Packet is OK - process it.
- */
- length = be32_to_cpu(cqe->byte_cnt);
- ring->bytes += length;
- ring->packets++;
-
- if (likely(dev->features & NETIF_F_RXCSUM)) {
- if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
- (cqe->checksum == cpu_to_be16(0xffff))) {
- priv->port_stats.rx_chksum_good++;
- /* This packet is eligible for LRO if it is:
- * - DIX Ethernet (type interpretation)
- * - TCP/IP (v4)
- * - without IP options
- * - not an IP fragment */
- if (dev->features & NETIF_F_GRO) {
- struct sk_buff *gro_skb = napi_get_frags(&cq->napi);
- if (!gro_skb)
- goto next;
-
- nr = mlx4_en_complete_rx_desc(
- priv, rx_desc,
- skb_frags, skb_shinfo(gro_skb)->frags,
- ring->page_alloc, length);
- if (!nr)
- goto next;
-
- skb_shinfo(gro_skb)->nr_frags = nr;
- gro_skb->len = length;
- gro_skb->data_len = length;
- gro_skb->truesize += length;
- gro_skb->ip_summed = CHECKSUM_UNNECESSARY;
-
- if (cqe->vlan_my_qpn &
- cpu_to_be32(MLX4_CQE_VLAN_PRESENT_MASK)) {
- u16 vid = be16_to_cpu(cqe->sl_vid);
-
- __vlan_hwaccel_put_tag(gro_skb, vid);
- }
-
- napi_gro_frags(&cq->napi);
-
- goto next;
- }
-
- /* LRO not possible, complete processing here */
- ip_summed = CHECKSUM_UNNECESSARY;
- } else {
- ip_summed = CHECKSUM_NONE;
- priv->port_stats.rx_chksum_none++;
- }
- } else {
- ip_summed = CHECKSUM_NONE;
- priv->port_stats.rx_chksum_none++;
- }
-
- skb = mlx4_en_rx_skb(priv, rx_desc, skb_frags,
- ring->page_alloc, length);
- if (!skb) {
- priv->stats.rx_dropped++;
- goto next;
- }
-
- if (unlikely(priv->validate_loopback)) {
- validate_loopback(priv, skb);
- goto next;
- }
-
- skb->ip_summed = ip_summed;
- skb->protocol = eth_type_trans(skb, dev);
- skb_record_rx_queue(skb, cq->ring);
-
- if (be32_to_cpu(cqe->vlan_my_qpn) &
- MLX4_CQE_VLAN_PRESENT_MASK)
- __vlan_hwaccel_put_tag(skb, be16_to_cpu(cqe->sl_vid));
-
- /* Push it up the stack */
- netif_receive_skb(skb);
-
-next:
- ++cq->mcq.cons_index;
- index = (cq->mcq.cons_index) & ring->size_mask;
- cqe = &cq->buf[index];
- if (++polled == budget) {
- /* We are here because we reached the NAPI budget -
- * flush only pending LRO sessions */
- goto out;
- }
- }
-
-out:
- AVG_PERF_COUNTER(priv->pstats.rx_coal_avg, polled);
- mlx4_cq_set_ci(&cq->mcq);
- wmb(); /* ensure HW sees CQ consumer before we post new buffers */
- ring->cons = cq->mcq.cons_index;
- ring->prod += polled; /* Polled descriptors were realocated in place */
- mlx4_en_update_rx_prod_db(ring);
- return polled;
-}
-
-
-void mlx4_en_rx_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);
-
- if (priv->port_up)
- napi_schedule(&cq->napi);
- else
- mlx4_en_arm_cq(priv, cq);
-}
-
-/* Rx CQ polling - called by NAPI */
-int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
-{
- struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
- struct net_device *dev = cq->dev;
- struct mlx4_en_priv *priv = netdev_priv(dev);
- int done;
-
- done = mlx4_en_process_rx_cq(dev, cq, budget);
-
- /* If we used up all the quota - we're probably not done yet... */
- if (done == budget)
- INC_PERF_COUNTER(priv->pstats.napi_quota);
- else {
- /* Done for now */
- napi_complete(napi);
- mlx4_en_arm_cq(priv, cq);
- }
- return done;
-}
-
-
-/* Calculate the last offset position that accommodates a full fragment
- * (assuming fagment size = stride-align) */
-static int mlx4_en_last_alloc_offset(struct mlx4_en_priv *priv, u16 stride, u16 align)
-{
- u16 res = MLX4_EN_ALLOC_SIZE % stride;
- u16 offset = MLX4_EN_ALLOC_SIZE - stride - res + align;
-
- en_dbg(DRV, priv, "Calculated last offset for stride:%d align:%d "
- "res:%d offset:%d\n", stride, align, res, offset);
- return offset;
-}
-
-
-static int frag_sizes[] = {
- FRAG_SZ0,
- FRAG_SZ1,
- FRAG_SZ2,
- FRAG_SZ3
-};
-
-void mlx4_en_calc_rx_buf(struct net_device *dev)
-{
- struct mlx4_en_priv *priv = netdev_priv(dev);
- int eff_mtu = dev->mtu + ETH_HLEN + VLAN_HLEN + ETH_LLC_SNAP_SIZE;
- int buf_size = 0;
- int i = 0;
-
- while (buf_size < eff_mtu) {
- priv->frag_info[i].frag_size =
- (eff_mtu > buf_size + frag_sizes[i]) ?
- frag_sizes[i] : eff_mtu - buf_size;
- priv->frag_info[i].frag_prefix_size = buf_size;
- if (!i) {
- priv->frag_info[i].frag_align = NET_IP_ALIGN;
- priv->frag_info[i].frag_stride =
- ALIGN(frag_sizes[i] + NET_IP_ALIGN, SMP_CACHE_BYTES);
- } else {
- priv->frag_info[i].frag_align = 0;
- priv->frag_info[i].frag_stride =
- ALIGN(frag_sizes[i], SMP_CACHE_BYTES);
- }
- priv->frag_info[i].last_offset = mlx4_en_last_alloc_offset(
- priv, priv->frag_info[i].frag_stride,
- priv->frag_info[i].frag_align);
- buf_size += priv->frag_info[i].frag_size;
- i++;
- }
-
- priv->num_frags = i;
- priv->rx_skb_size = eff_mtu;
- priv->log_rx_info = ROUNDUP_LOG2(i * sizeof(struct skb_frag_struct));
-
- en_dbg(DRV, priv, "Rx buffer scatter-list (effective-mtu:%d "
- "num_frags:%d):\n", eff_mtu, priv->num_frags);
- for (i = 0; i < priv->num_frags; i++) {
- en_dbg(DRV, priv, " frag:%d - size:%d prefix:%d align:%d "
- "stride:%d last_offset:%d\n", i,
- priv->frag_info[i].frag_size,
- priv->frag_info[i].frag_prefix_size,
- priv->frag_info[i].frag_align,
- priv->frag_info[i].frag_stride,
- priv->frag_info[i].last_offset);
- }
-}
-
-/* RSS related functions */
-
-static int mlx4_en_config_rss_qp(struct mlx4_en_priv *priv, int qpn,
- struct mlx4_en_rx_ring *ring,
- enum mlx4_qp_state *state,
- struct mlx4_qp *qp)
-{
- struct mlx4_en_dev *mdev = priv->mdev;
- struct mlx4_qp_context *context;
- int err = 0;
-
- context = kmalloc(sizeof *context , GFP_KERNEL);
- if (!context) {
- en_err(priv, "Failed to allocate qp context\n");
- return -ENOMEM;
- }
-
- err = mlx4_qp_alloc(mdev->dev, qpn, qp);
- if (err) {
- en_err(priv, "Failed to allocate qp #%x\n", qpn);
- goto out;
- }
- qp->event = mlx4_en_sqp_event;
-
- memset(context, 0, sizeof *context);
- mlx4_en_fill_qp_context(priv, ring->actual_size, ring->stride, 0, 0,
- qpn, ring->cqn, context);
- context->db_rec_addr = cpu_to_be64(ring->wqres.db.dma);
-
- err = mlx4_qp_to_ready(mdev->dev, &ring->wqres.mtt, context, qp, state);
- if (err) {
- mlx4_qp_remove(mdev->dev, qp);
- mlx4_qp_free(mdev->dev, qp);
- }
- mlx4_en_update_rx_prod_db(ring);
-out:
- kfree(context);
- return err;
-}
-
-/* Allocate rx qp's and configure them according to rss map */
-int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
-{
- struct mlx4_en_dev *mdev = priv->mdev;
- struct mlx4_en_rss_map *rss_map = &priv->rss_map;
- struct mlx4_qp_context context;
- struct mlx4_en_rss_context *rss_context;
- void *ptr;
- u8 rss_mask = 0x3f;
- int i, qpn;
- int err = 0;
- int good_qps = 0;
-
- en_dbg(DRV, priv, "Configuring rss steering\n");
- err = mlx4_qp_reserve_range(mdev->dev, priv->rx_ring_num,
- priv->rx_ring_num,
- &rss_map->base_qpn);
- if (err) {
- en_err(priv, "Failed reserving %d qps\n", priv->rx_ring_num);
- return err;
- }
-
- for (i = 0; i < priv->rx_ring_num; i++) {
- qpn = rss_map->base_qpn + i;
- err = mlx4_en_config_rss_qp(priv, qpn, &priv->rx_ring[i],
- &rss_map->state[i],
- &rss_map->qps[i]);
- if (err)
- goto rss_err;
-
- ++good_qps;
- }
-
- /* Configure RSS indirection qp */
- err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, &rss_map->indir_qp);
- if (err) {
- en_err(priv, "Failed to allocate RSS indirection QP\n");
- goto rss_err;
- }
- rss_map->indir_qp.event = mlx4_en_sqp_event;
- mlx4_en_fill_qp_context(priv, 0, 0, 0, 1, priv->base_qpn,
- priv->rx_ring[0].cqn, &context);
-
- ptr = ((void *) &context) + 0x3c;
- rss_context = ptr;
- rss_context->base_qpn = cpu_to_be32(ilog2(priv->rx_ring_num) << 24 |
- (rss_map->base_qpn));
- rss_context->default_qpn = cpu_to_be32(rss_map->base_qpn);
- rss_context->flags = rss_mask;
-
- if (priv->mdev->profile.udp_rss)
- rss_context->base_qpn_udp = rss_context->default_qpn;
- err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context,
- &rss_map->indir_qp, &rss_map->indir_state);
- if (err)
- goto indir_err;
-
- return 0;
-
-indir_err:
- mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
- MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
- mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
- mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
-rss_err:
- for (i = 0; i < good_qps; i++) {
- mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
- MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
- mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
- mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
- }
- mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
- return err;
-}
-
-void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv)
-{
- struct mlx4_en_dev *mdev = priv->mdev;
- struct mlx4_en_rss_map *rss_map = &priv->rss_map;
- int i;
-
- mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
- MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
- mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
- mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
-
- for (i = 0; i < priv->rx_ring_num; i++) {
- mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
- MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
- mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
- mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
- }
- mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
-}
-
-
-
-
-
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