diff options
Diffstat (limited to 'drivers/net/mlx4/en_rx.c')
| -rw-r--r-- | drivers/net/mlx4/en_rx.c | 1079 |
1 files changed, 0 insertions, 1079 deletions
diff --git a/drivers/net/mlx4/en_rx.c b/drivers/net/mlx4/en_rx.c deleted file mode 100644 index c61b0bdca1a..00000000000 --- a/drivers/net/mlx4/en_rx.c +++ /dev/null @@ -1,1079 +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/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 void *get_wqe(struct mlx4_en_rx_ring *ring, int n) -{ - int offset = n << ring->srq.wqe_shift; - return ring->buf + offset; -} - -static void mlx4_en_srq_event(struct mlx4_srq *srq, enum mlx4_event type) -{ - return; -} - -static int mlx4_en_get_frag_header(struct skb_frag_struct *frags, void **mac_hdr, - void **ip_hdr, void **tcpudp_hdr, - u64 *hdr_flags, void *priv) -{ - *mac_hdr = page_address(frags->page) + frags->page_offset; - *ip_hdr = *mac_hdr + ETH_HLEN; - *tcpudp_hdr = (struct tcphdr *)(*ip_hdr + sizeof(struct iphdr)); - *hdr_flags = LRO_IPV4 | LRO_TCP; - - return 0; -} - -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; - mlx4_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]; - mlx4_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; - - /* Pre-link descriptor */ - rx_desc->next.next_wqe_index = cpu_to_be16((index + 1) & ring->size_mask); - - /* 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 int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv) -{ - struct mlx4_en_dev *mdev = priv->mdev; - struct mlx4_en_rx_ring *ring; - int ring_ind; - int buf_ind; - - 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) { - mlx4_err(mdev, "Failed to allocate " - "enough rx buffers\n"); - return -ENOMEM; - } else { - if (netif_msg_rx_err(priv)) - mlx4_warn(mdev, - "Only %d buffers allocated\n", - ring->actual_size); - goto out; - } - } - ring->actual_size++; - ring->prod++; - } - } -out: - return 0; -} - -static int mlx4_en_fill_rx_buf(struct net_device *dev, - struct mlx4_en_rx_ring *ring) -{ - struct mlx4_en_priv *priv = netdev_priv(dev); - int num = 0; - int err; - - while ((u32) (ring->prod - ring->cons) < ring->actual_size) { - err = mlx4_en_prepare_rx_desc(priv, ring, ring->prod & - ring->size_mask); - if (err) { - if (netif_msg_rx_err(priv)) - mlx4_warn(priv->mdev, - "Failed preparing rx descriptor\n"); - priv->port_stats.rx_alloc_failed++; - break; - } - ++num; - ++ring->prod; - } - if ((u32) (ring->prod - ring->cons) == ring->size) - ring->full = 1; - - return num; -} - -static void mlx4_en_free_rx_buf(struct mlx4_en_priv *priv, - struct mlx4_en_rx_ring *ring) -{ - struct mlx4_en_dev *mdev = priv->mdev; - struct skb_frag_struct *skb_frags; - struct mlx4_en_rx_desc *rx_desc; - dma_addr_t dma; - int index; - int nr; - - mlx4_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->size); - while (ring->cons != ring->prod) { - index = ring->cons & ring->size_mask; - rx_desc = ring->buf + (index << ring->log_stride); - skb_frags = ring->rx_info + (index << priv->log_rx_info); - mlx4_dbg(DRV, priv, "Processing descriptor:%d\n", index); - - for (nr = 0; nr < priv->num_frags; nr++) { - mlx4_dbg(DRV, priv, "Freeing fragment:%d\n", nr); - dma = be64_to_cpu(rx_desc->data[nr].addr); - - mlx4_dbg(DRV, priv, "Unmaping 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); - } - ++ring->cons; - } -} - - -void mlx4_en_rx_refill(struct work_struct *work) -{ - struct delayed_work *delay = container_of(work, struct delayed_work, work); - struct mlx4_en_priv *priv = container_of(delay, struct mlx4_en_priv, - refill_task); - struct mlx4_en_dev *mdev = priv->mdev; - struct net_device *dev = priv->dev; - struct mlx4_en_rx_ring *ring; - int need_refill = 0; - int i; - - mutex_lock(&mdev->state_lock); - if (!mdev->device_up || !priv->port_up) - goto out; - - /* We only get here if there are no receive buffers, so we can't race - * with Rx interrupts while filling buffers */ - for (i = 0; i < priv->rx_ring_num; i++) { - ring = &priv->rx_ring[i]; - if (ring->need_refill) { - if (mlx4_en_fill_rx_buf(dev, ring)) { - ring->need_refill = 0; - mlx4_en_update_rx_prod_db(ring); - } else - need_refill = 1; - } - } - if (need_refill) - queue_delayed_work(mdev->workqueue, &priv->refill_task, HZ); - -out: - mutex_unlock(&mdev->state_lock); -} - - -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; - - /* Sanity check SRQ size before proceeding */ - if (size >= mdev->dev->caps.max_srq_wqes) - return -EINVAL; - - 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; - - 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) { - mlx4_err(mdev, "Failed allocating rx_info ring\n"); - return -ENOMEM; - } - mlx4_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) { - mlx4_err(mdev, "Failed to map RX buffer\n"); - goto err_hwq; - } - ring->buf = ring->wqres.buf.direct.buf; - - /* Configure lro mngr */ - memset(&ring->lro, 0, sizeof(struct net_lro_mgr)); - ring->lro.dev = priv->dev; - ring->lro.features = LRO_F_NAPI; - ring->lro.frag_align_pad = NET_IP_ALIGN; - ring->lro.ip_summed = CHECKSUM_UNNECESSARY; - ring->lro.ip_summed_aggr = CHECKSUM_UNNECESSARY; - ring->lro.max_desc = mdev->profile.num_lro; - ring->lro.max_aggr = MAX_SKB_FRAGS; - ring->lro.lro_arr = kzalloc(mdev->profile.num_lro * - sizeof(struct net_lro_desc), - GFP_KERNEL); - if (!ring->lro.lro_arr) { - mlx4_err(mdev, "Failed to allocate lro array\n"); - goto err_map; - } - ring->lro.get_frag_header = mlx4_en_get_frag_header; - - return 0; - -err_map: - mlx4_en_unmap_buffer(&ring->wqres.buf); -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_dev *mdev = priv->mdev; - struct mlx4_wqe_srq_next_seg *next; - 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); - int max_gs = (stride - sizeof(struct mlx4_wqe_srq_next_seg)) / DS_SIZE; - - 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; - 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) { - mlx4_err(mdev, "Failed initializing ring allocator\n"); - goto err_allocator; - } - - /* Fill Rx buffers */ - ring->full = 0; - } - 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]; - - mlx4_en_update_rx_prod_db(ring); - - /* Configure SRQ representing the ring */ - ring->srq.max = ring->size; - ring->srq.max_gs = max_gs; - ring->srq.wqe_shift = ilog2(ring->stride); - - for (i = 0; i < ring->srq.max; ++i) { - next = get_wqe(ring, i); - next->next_wqe_index = - cpu_to_be16((i + 1) & (ring->srq.max - 1)); - } - - err = mlx4_srq_alloc(mdev->dev, mdev->priv_pdn, &ring->wqres.mtt, - ring->wqres.db.dma, &ring->srq); - if (err){ - mlx4_err(mdev, "Failed to allocate srq\n"); - goto err_srq; - } - ring->srq.event = mlx4_en_srq_event; - } - - return 0; - -err_srq: - while (ring_ind >= 0) { - ring = &priv->rx_ring[ring_ind]; - mlx4_srq_free(mdev->dev, &ring->srq); - ring_ind--; - } - -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) { - 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; - - kfree(ring->lro.lro_arr); - mlx4_en_unmap_buffer(&ring->wqres.buf); - mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_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) -{ - struct mlx4_en_dev *mdev = priv->mdev; - - mlx4_srq_free(mdev->dev, &ring->srq); - mlx4_en_free_rx_buf(priv, ring); - 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[nr].size, - PCI_DMA_FROMDEVICE); - } - /* Adjust size of last fragment to match actual length */ - 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) { - mlx4_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_range_for_cpu(&mdev->pdev->dev, dma, 0, - length, DMA_FROM_DEVICE); - skb_copy_to_linear_data(skb, va, length); - dma_sync_single_range_for_device(&mdev->pdev->dev, dma, 0, - 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); - 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 mlx4_en_copy_desc(struct mlx4_en_priv *priv, - struct mlx4_en_rx_ring *ring, - int from, int to, int num) -{ - struct skb_frag_struct *skb_frags_from; - struct skb_frag_struct *skb_frags_to; - struct mlx4_en_rx_desc *rx_desc_from; - struct mlx4_en_rx_desc *rx_desc_to; - int from_index, to_index; - int nr, i; - - for (i = 0; i < num; i++) { - from_index = (from + i) & ring->size_mask; - to_index = (to + i) & ring->size_mask; - skb_frags_from = ring->rx_info + (from_index << priv->log_rx_info); - skb_frags_to = ring->rx_info + (to_index << priv->log_rx_info); - rx_desc_from = ring->buf + (from_index << ring->log_stride); - rx_desc_to = ring->buf + (to_index << ring->log_stride); - - for (nr = 0; nr < priv->num_frags; nr++) { - skb_frags_to[nr].page = skb_frags_from[nr].page; - skb_frags_to[nr].page_offset = skb_frags_from[nr].page_offset; - rx_desc_to->data[nr].addr = rx_desc_from->data[nr].addr; - } - } -} - - -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_en_dev *mdev = priv->mdev; - struct mlx4_cqe *cqe; - struct mlx4_en_rx_ring *ring = &priv->rx_ring[cq->ring]; - struct skb_frag_struct *skb_frags; - struct skb_frag_struct lro_frags[MLX4_EN_MAX_RX_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)) { - mlx4_err(mdev, "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)) { - mlx4_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(priv->rx_csum)) { - 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 (mlx4_en_can_lro(cqe->status) && - dev->features & NETIF_F_LRO) { - - nr = mlx4_en_complete_rx_desc( - priv, rx_desc, - skb_frags, lro_frags, - ring->page_alloc, length); - if (!nr) - goto next; - - if (priv->vlgrp && (cqe->vlan_my_qpn & - cpu_to_be32(MLX4_CQE_VLAN_PRESENT_MASK))) { - lro_vlan_hwaccel_receive_frags( - &ring->lro, lro_frags, - length, length, - priv->vlgrp, - be16_to_cpu(cqe->sl_vid), - NULL, 0); - } else - lro_receive_frags(&ring->lro, - lro_frags, - length, - length, - NULL, 0); - - goto next; - } - - /* LRO not possible, complete processing here */ - ip_summed = CHECKSUM_UNNECESSARY; - INC_PERF_COUNTER(priv->pstats.lro_misses); - } 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; - } - - skb->ip_summed = ip_summed; - skb->protocol = eth_type_trans(skb, dev); - - /* Push it up the stack */ - if (priv->vlgrp && (be32_to_cpu(cqe->vlan_my_qpn) & - MLX4_CQE_VLAN_PRESENT_MASK)) { - vlan_hwaccel_receive_skb(skb, priv->vlgrp, - be16_to_cpu(cqe->sl_vid)); - } else - 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 */ - lro_flush_all(&ring->lro); - goto out; - } - } - - /* If CQ is empty flush all LRO sessions unconditionally */ - lro_flush_all(&ring->lro); - -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 */ - if (unlikely(!ring->full)) { - mlx4_en_copy_desc(priv, ring, ring->cons - polled, - ring->prod - polled, polled); - mlx4_en_fill_rx_buf(dev, ring); - } - 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) - netif_rx_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 */ - netif_rx_complete(napi); - mlx4_en_arm_cq(priv, cq); - } - return done; -} - - -/* Calculate the last offset position that accomodates 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; - - mlx4_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)); - - mlx4_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++) { - mlx4_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 */ - -/* Calculate rss size and map each entry in rss table to rx ring */ -void mlx4_en_set_default_rss_map(struct mlx4_en_priv *priv, - struct mlx4_en_rss_map *rss_map, - int num_entries, int num_rings) -{ - int i; - - rss_map->size = roundup_pow_of_two(num_entries); - mlx4_dbg(DRV, priv, "Setting default RSS map of %d entires\n", - rss_map->size); - - for (i = 0; i < rss_map->size; i++) { - rss_map->map[i] = i % num_rings; - mlx4_dbg(DRV, priv, "Entry %d ---> ring %d\n", i, rss_map->map[i]); - } -} - -static void mlx4_en_sqp_event(struct mlx4_qp *qp, enum mlx4_event event) -{ - return; -} - - -static int mlx4_en_config_rss_qp(struct mlx4_en_priv *priv, - int qpn, int srqn, int cqn, - 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) { - mlx4_err(mdev, "Failed to allocate qp context\n"); - return -ENOMEM; - } - - err = mlx4_qp_alloc(mdev->dev, qpn, qp); - if (err) { - mlx4_err(mdev, "Failed to allocate qp #%d\n", qpn); - goto out; - return err; - } - qp->event = mlx4_en_sqp_event; - - memset(context, 0, sizeof *context); - mlx4_en_fill_qp_context(priv, 0, 0, 0, 0, qpn, cqn, srqn, context); - - err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, context, qp, state); - if (err) { - mlx4_qp_remove(mdev->dev, qp); - mlx4_qp_free(mdev->dev, qp); - } -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; - int rss_xor = mdev->profile.rss_xor; - u8 rss_mask = mdev->profile.rss_mask; - int i, srqn, qpn, cqn; - int err = 0; - int good_qps = 0; - - mlx4_dbg(DRV, priv, "Configuring rss steering for port %u\n", priv->port); - err = mlx4_qp_reserve_range(mdev->dev, rss_map->size, - rss_map->size, &rss_map->base_qpn); - if (err) { - mlx4_err(mdev, "Failed reserving %d qps for port %u\n", - rss_map->size, priv->port); - return err; - } - - for (i = 0; i < rss_map->size; i++) { - cqn = priv->rx_ring[rss_map->map[i]].cqn; - srqn = priv->rx_ring[rss_map->map[i]].srq.srqn; - qpn = rss_map->base_qpn + i; - err = mlx4_en_config_rss_qp(priv, qpn, srqn, cqn, - &rss_map->state[i], - &rss_map->qps[i]); - if (err) - goto rss_err; - - ++good_qps; - } - - /* Configure RSS indirection qp */ - err = mlx4_qp_reserve_range(mdev->dev, 1, 1, &priv->base_qpn); - if (err) { - mlx4_err(mdev, "Failed to reserve range for RSS " - "indirection qp\n"); - goto rss_err; - } - err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, &rss_map->indir_qp); - if (err) { - mlx4_err(mdev, "Failed to allocate RSS indirection QP\n"); - goto reserve_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, 0, &context); - - ptr = ((void *) &context) + 0x3c; - rss_context = (struct mlx4_en_rss_context *) ptr; - rss_context->base_qpn = cpu_to_be32(ilog2(rss_map->size) << 24 | - (rss_map->base_qpn)); - rss_context->default_qpn = cpu_to_be32(rss_map->base_qpn); - rss_context->hash_fn = rss_xor & 0x3; - rss_context->flags = rss_mask << 2; - - 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); -reserve_err: - mlx4_qp_release_range(mdev->dev, priv->base_qpn, 1); -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, rss_map->size); - 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); - mlx4_qp_release_range(mdev->dev, priv->base_qpn, 1); - - for (i = 0; i < rss_map->size; 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, rss_map->size); -} - - - - - |