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Date: Wed, 8 Apr 2015 17:51:23 +0300
From: Amir Vadai <amirv@...lanox.com>
To: "David S. Miller" <davem@...emloft.net>
Cc: netdev@...r.kernel.org, Yevgeny Petrilin <yevgenyp@...lanox.com>,
Saeed Mahameed <saeedm@...lanox.com>,
Or Gerlitz <ogerlitz@...lanox.com>,
Achiad Shochat <achiad@...lanox.com>,
Ido Shamay <idos@...lanox.com>, Amir Vadai <amirv@...lanox.com>
Subject: [PATCH net-next 09/11] net/mlx5: Ethernet Datapath files
Signed-off-by: Amir Vadai <amirv@...lanox.com>
---
drivers/net/ethernet/mellanox/mlx5/core/en_rx.c | 249 +++++++++++++++
drivers/net/ethernet/mellanox/mlx5/core/en_tx.c | 350 ++++++++++++++++++++++
drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c | 107 +++++++
3 files changed, 706 insertions(+)
create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
new file mode 100644
index 0000000..e567046
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -0,0 +1,249 @@
+/*
+ * Copyright (c) 2015, 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/ip.h>
+#include <linux/ipv6.h>
+#include <linux/tcp.h>
+#include "en.h"
+
+static inline int mlx5e_alloc_rx_wqe(struct mlx5e_rq *rq,
+ struct mlx5e_rx_wqe *wqe, u16 ix)
+{
+ struct sk_buff *skb;
+ dma_addr_t dma_addr;
+
+ skb = netdev_alloc_skb(rq->netdev, rq->wqe_sz);
+ if (unlikely(!skb))
+ return -ENOMEM;
+
+ skb_reserve(skb, MLX5E_NET_IP_ALIGN);
+
+ dma_addr = dma_map_single(rq->pdev,
+ /* hw start padding */
+ skb->data - MLX5E_NET_IP_ALIGN,
+ /* hw end padding */
+ skb_end_offset(skb),
+ DMA_FROM_DEVICE);
+
+ if (unlikely(dma_mapping_error(rq->pdev, dma_addr)))
+ goto err_free_skb;
+
+ *((dma_addr_t *)skb->cb) = dma_addr;
+ wqe->data.addr = cpu_to_be64(dma_addr + MLX5E_NET_IP_ALIGN);
+
+ rq->skb[ix] = skb;
+
+ return 0;
+
+err_free_skb:
+ dev_kfree_skb(skb);
+
+ return -ENOMEM;
+}
+
+bool mlx5e_post_rx_wqes(struct mlx5e_rq *rq)
+{
+ struct mlx5_wq_ll *wq = &rq->wq;
+
+ if (unlikely(!test_bit(MLX5E_RQ_STATE_POST_WQES_ENABLE, &rq->state)))
+ return false;
+
+ while (!mlx5_wq_ll_is_full(wq)) {
+ struct mlx5e_rx_wqe *wqe = mlx5_wq_ll_get_wqe(wq, wq->head);
+
+ if (unlikely(mlx5e_alloc_rx_wqe(rq, wqe, wq->head)))
+ break;
+
+ mlx5_wq_ll_push(wq, be16_to_cpu(wqe->next.next_wqe_index));
+ }
+
+ /* ensure wqes are visible to device before updating doorbell record */
+ wmb();
+
+ mlx5_wq_ll_update_db_record(wq);
+
+ return !mlx5_wq_ll_is_full(wq);
+}
+
+static void mlx5e_lro_update_hdr(struct sk_buff *skb, struct mlx5_cqe64 *cqe)
+{
+ struct ethhdr *eth = (struct ethhdr *)(skb->data);
+ struct iphdr *ipv4 = (struct iphdr *)(skb->data + ETH_HLEN);
+ struct ipv6hdr *ipv6 = (struct ipv6hdr *)(skb->data + ETH_HLEN);
+ struct tcphdr *tcp;
+
+ u8 l4_hdr_type = get_cqe_l4_hdr_type(cqe);
+ int tcp_ack = ((CQE_L4_HDR_TYPE_TCP_ACK_NO_DATA == l4_hdr_type) ||
+ (CQE_L4_HDR_TYPE_TCP_ACK_AND_DATA == l4_hdr_type));
+
+ u16 tot_len = be32_to_cpu(cqe->byte_cnt) - ETH_HLEN;
+
+ if (eth->h_proto == htons(ETH_P_IP)) {
+ tcp = (struct tcphdr *)(skb->data + ETH_HLEN +
+ sizeof(struct iphdr));
+ ipv6 = NULL;
+ } else {
+ tcp = (struct tcphdr *)(skb->data + ETH_HLEN +
+ sizeof(struct ipv6hdr));
+ ipv4 = NULL;
+ }
+
+ if (get_cqe_lro_tcppsh(cqe))
+ tcp->psh = 1;
+
+ if (tcp_ack) {
+ tcp->ack = 1;
+ tcp->ack_seq = cqe->lro_ack_seq_num;
+ tcp->window = cqe->lro_tcp_win;
+ }
+
+ if (ipv4) {
+ ipv4->ttl = cqe->lro_min_ttl;
+ ipv4->tot_len = cpu_to_be16(tot_len);
+ ipv4->check = 0;
+ ipv4->check = ip_fast_csum((unsigned char *)ipv4,
+ ipv4->ihl);
+ } else {
+ ipv6->hop_limit = cqe->lro_min_ttl;
+ ipv6->payload_len = cpu_to_be16(tot_len -
+ sizeof(struct ipv6hdr));
+ }
+}
+
+static inline void mlx5e_skb_set_hash(struct mlx5_cqe64 *cqe,
+ struct sk_buff *skb)
+{
+ u8 cht = cqe->rss_hash_type;
+ int ht = (cht & CQE_RSS_HTYPE_L4) ? PKT_HASH_TYPE_L4 :
+ (cht & CQE_RSS_HTYPE_IP) ? PKT_HASH_TYPE_L3 :
+ PKT_HASH_TYPE_NONE;
+ skb_set_hash(skb, be32_to_cpu(cqe->rss_hash_result), ht);
+}
+
+static inline void mlx5e_build_rx_skb(struct mlx5_cqe64 *cqe,
+ struct mlx5e_rq *rq,
+ struct sk_buff *skb)
+{
+ struct net_device *netdev = rq->netdev;
+ u32 cqe_bcnt = be32_to_cpu(cqe->byte_cnt);
+ int lro_num_seg;
+
+ skb_put(skb, cqe_bcnt);
+
+ lro_num_seg = be32_to_cpu(cqe->srqn) >> 24;
+ if (lro_num_seg > 1) {
+ mlx5e_lro_update_hdr(skb, cqe);
+ skb_shinfo(skb)->gso_size = MLX5E_PARAMS_DEFAULT_LRO_WQE_SZ;
+ rq->stats.lro_packets++;
+ rq->stats.lro_bytes += cqe_bcnt;
+ }
+
+ if (likely(netdev->features & NETIF_F_RXCSUM) &&
+ (cqe->hds_ip_ext & CQE_L2_OK) &&
+ (cqe->hds_ip_ext & CQE_L3_OK) &&
+ (cqe->hds_ip_ext & CQE_L4_OK)) {
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ } else {
+ skb->ip_summed = CHECKSUM_NONE;
+ rq->stats.csum_none++;
+ }
+
+ skb->protocol = eth_type_trans(skb, netdev);
+
+ skb_record_rx_queue(skb, rq->ix);
+
+ if (likely(netdev->features & NETIF_F_RXHASH))
+ mlx5e_skb_set_hash(cqe, skb);
+
+ if (cqe_has_vlan(cqe))
+ __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
+ be16_to_cpu(cqe->vlan_info));
+}
+
+bool mlx5e_poll_rx_cq(struct mlx5e_cq *cq, int budget)
+{
+ struct mlx5e_rq *rq = cq->sqrq;
+ int i;
+
+ /* avoid accessing cq (dma coherent memory) if not needed */
+ if (!test_and_clear_bit(MLX5E_CQ_HAS_CQES, &cq->flags))
+ return false;
+
+ for (i = 0; i < budget; i++) {
+ struct mlx5e_rx_wqe *wqe;
+ struct mlx5_cqe64 *cqe;
+ struct sk_buff *skb;
+ __be16 wqe_counter_be;
+ u16 wqe_counter;
+
+ cqe = mlx5e_get_cqe(cq);
+ if (!cqe)
+ break;
+
+ wqe_counter_be = cqe->wqe_counter;
+ wqe_counter = be16_to_cpu(wqe_counter_be);
+ wqe = mlx5_wq_ll_get_wqe(&rq->wq, wqe_counter);
+ skb = rq->skb[wqe_counter];
+ rq->skb[wqe_counter] = NULL;
+
+ dma_unmap_single(rq->pdev,
+ *((dma_addr_t *)skb->cb),
+ skb_end_offset(skb),
+ DMA_FROM_DEVICE);
+
+ if (unlikely((cqe->op_own >> 4) != MLX5_CQE_RESP_SEND)) {
+ rq->stats.wqe_err++;
+ dev_kfree_skb(skb);
+ goto wq_ll_pop;
+ }
+
+ mlx5e_build_rx_skb(cqe, rq, skb);
+ rq->stats.packets++;
+ napi_gro_receive(cq->napi, skb);
+
+wq_ll_pop:
+ mlx5_wq_ll_pop(&rq->wq, wqe_counter_be,
+ &wqe->next.next_wqe_index);
+ }
+
+ mlx5_cqwq_update_db_record(&cq->wq);
+
+ /* ensure cq space is freed before enabling more cqes */
+ wmb();
+
+ if (i == budget) {
+ set_bit(MLX5E_CQ_HAS_CQES, &cq->flags);
+ return true;
+ }
+
+ return false;
+}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
new file mode 100644
index 0000000..1bd2027
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
@@ -0,0 +1,350 @@
+/*
+ * Copyright (c) 2015, 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/tcp.h>
+#include <linux/if_vlan.h>
+#include "en.h"
+
+static void mlx5e_dma_pop_last_pushed(struct mlx5e_sq *sq, dma_addr_t *addr,
+ u32 *size)
+{
+ sq->dma_fifo_pc--;
+ *addr = sq->dma_fifo[sq->dma_fifo_pc & sq->dma_fifo_mask].addr;
+ *size = sq->dma_fifo[sq->dma_fifo_pc & sq->dma_fifo_mask].size;
+}
+
+static void mlx5e_dma_unmap_wqe_err(struct mlx5e_sq *sq, struct sk_buff *skb)
+{
+ dma_addr_t addr;
+ u32 size;
+ int i;
+
+ for (i = 0; i < MLX5E_TX_SKB_CB(skb)->num_dma; i++) {
+ mlx5e_dma_pop_last_pushed(sq, &addr, &size);
+ dma_unmap_single(sq->pdev, addr, size, DMA_TO_DEVICE);
+ }
+}
+
+static inline void mlx5e_dma_push(struct mlx5e_sq *sq, dma_addr_t addr,
+ u32 size)
+{
+ sq->dma_fifo[sq->dma_fifo_pc & sq->dma_fifo_mask].addr = addr;
+ sq->dma_fifo[sq->dma_fifo_pc & sq->dma_fifo_mask].size = size;
+ sq->dma_fifo_pc++;
+}
+
+static inline void mlx5e_dma_get(struct mlx5e_sq *sq, u32 i, dma_addr_t *addr,
+ u32 *size)
+{
+ *addr = sq->dma_fifo[i & sq->dma_fifo_mask].addr;
+ *size = sq->dma_fifo[i & sq->dma_fifo_mask].size;
+}
+
+u16 mlx5e_select_queue(struct net_device *dev, struct sk_buff *skb,
+ void *accel_priv, select_queue_fallback_t fallback)
+{
+ struct mlx5e_priv *priv = netdev_priv(dev);
+ int channel_ix = fallback(dev, skb);
+ int up = skb_vlan_tag_present(skb) ?
+ skb->vlan_tci >> VLAN_PRIO_SHIFT :
+ priv->default_vlan_prio;
+ int tc = netdev_get_prio_tc_map(dev, up);
+
+ return (tc << priv->order_base_2_num_channels) | channel_ix;
+}
+
+static inline u16 mlx5e_get_inline_hdr_size(struct mlx5e_sq *sq,
+ struct sk_buff *skb)
+{
+#define MLX5E_MIN_INLINE 16 /* eth header with vlan (w/o next ethertype) */
+#define MLX5E_MAX_INLINE (128 - sizeof(struct mlx5e_tx_wqe) +\
+ 2/*sizeof(eseg->inline_hdr_start)*/)
+
+ if (!skb_shinfo(skb)->nr_frags &&
+ (skb_headlen(skb) <= MLX5E_MAX_INLINE))
+ return skb_headlen(skb);
+
+ return MLX5E_MIN_INLINE;
+}
+
+static inline void mlx5e_insert_vlan(void *start, struct sk_buff *skb, u16 ihs)
+{
+ struct vlan_ethhdr *vhdr = (struct vlan_ethhdr *)start;
+ int cpy1_sz = 2 * ETH_ALEN;
+ int cpy2_sz = ihs - cpy1_sz - VLAN_HLEN;
+
+ skb_copy_from_linear_data(skb, vhdr, cpy1_sz);
+ skb_pull_inline(skb, cpy1_sz);
+ vhdr->h_vlan_proto = skb->vlan_proto;
+ vhdr->h_vlan_TCI = cpu_to_be16(skb_vlan_tag_get(skb));
+ skb_copy_from_linear_data(skb, &vhdr->h_vlan_encapsulated_proto,
+ cpy2_sz);
+ skb_pull_inline(skb, cpy2_sz);
+}
+
+static netdev_tx_t mlx5e_sq_xmit(struct mlx5e_sq *sq, struct sk_buff *skb)
+{
+ struct mlx5_wq_cyc *wq = &sq->wq;
+
+ u16 pi = sq->pc & wq->sz_m1;
+ struct mlx5e_tx_wqe *wqe = mlx5_wq_cyc_get_wqe(wq, pi);
+
+ struct mlx5_wqe_ctrl_seg *cseg = &wqe->ctrl;
+ struct mlx5_wqe_eth_seg *eseg = &wqe->eth;
+ struct mlx5_wqe_data_seg *dseg;
+
+ u8 opcode = MLX5_OPCODE_SEND;
+ dma_addr_t dma_addr = 0;
+ u16 headlen;
+ u16 ds_cnt;
+ u16 ihs;
+ int i;
+
+ memset(wqe, 0, sizeof(*wqe));
+
+ if (likely(skb->ip_summed == CHECKSUM_PARTIAL))
+ eseg->cs_flags = MLX5_ETH_WQE_L3_CSUM | MLX5_ETH_WQE_L4_CSUM;
+ else
+ sq->stats.csum_offload_none++;
+
+ if (skb_is_gso(skb)) {
+ u32 payload_len;
+ int num_pkts;
+
+ eseg->mss = cpu_to_be16(skb_shinfo(skb)->gso_size);
+ opcode = MLX5_OPCODE_LSO;
+ ihs = skb_transport_offset(skb) + tcp_hdrlen(skb);
+ payload_len = skb->len - ihs;
+ num_pkts = (payload_len / skb_shinfo(skb)->gso_size) +
+ !!(payload_len % skb_shinfo(skb)->gso_size);
+ MLX5E_TX_SKB_CB(skb)->num_bytes = skb->len +
+ (num_pkts - 1) * ihs;
+ sq->stats.tso_packets++;
+ sq->stats.tso_bytes += payload_len;
+ } else {
+ ihs = mlx5e_get_inline_hdr_size(sq, skb);
+ MLX5E_TX_SKB_CB(skb)->num_bytes = max_t(unsigned int, skb->len,
+ ETH_ZLEN);
+ }
+
+ if (skb_vlan_tag_present(skb)) {
+ mlx5e_insert_vlan(eseg->inline_hdr_start, skb, ihs);
+ } else {
+ skb_copy_from_linear_data(skb, eseg->inline_hdr_start, ihs);
+ skb_pull_inline(skb, ihs);
+ }
+
+ eseg->inline_hdr_sz = cpu_to_be16(ihs);
+
+ ds_cnt = sizeof(*wqe) / MLX5_SEND_WQE_DS;
+ ds_cnt += DIV_ROUND_UP(ihs - sizeof(eseg->inline_hdr_start),
+ MLX5_SEND_WQE_DS);
+ dseg = (struct mlx5_wqe_data_seg *)cseg + ds_cnt;
+
+ MLX5E_TX_SKB_CB(skb)->num_dma = 0;
+
+ headlen = skb_headlen(skb);
+ if (headlen) {
+ dma_addr = dma_map_single(sq->pdev, skb->data, headlen,
+ DMA_TO_DEVICE);
+ if (unlikely(dma_mapping_error(sq->pdev, dma_addr)))
+ goto dma_unmap_wqe_err;
+
+ dseg->addr = cpu_to_be64(dma_addr);
+ dseg->lkey = sq->mkey_be;
+ dseg->byte_count = cpu_to_be32(headlen);
+
+ mlx5e_dma_push(sq, dma_addr, headlen);
+ MLX5E_TX_SKB_CB(skb)->num_dma++;
+
+ dseg++;
+ }
+
+ for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+ struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[i];
+ int fsz = skb_frag_size(frag);
+
+ dma_addr = skb_frag_dma_map(sq->pdev, frag, 0, fsz,
+ DMA_TO_DEVICE);
+ if (unlikely(dma_mapping_error(sq->pdev, dma_addr)))
+ goto dma_unmap_wqe_err;
+
+ dseg->addr = cpu_to_be64(dma_addr);
+ dseg->lkey = sq->mkey_be;
+ dseg->byte_count = cpu_to_be32(fsz);
+
+ mlx5e_dma_push(sq, dma_addr, fsz);
+ MLX5E_TX_SKB_CB(skb)->num_dma++;
+
+ dseg++;
+ }
+
+ ds_cnt += MLX5E_TX_SKB_CB(skb)->num_dma;
+
+ cseg->opmod_idx_opcode = cpu_to_be32((sq->pc << 8) | opcode);
+ cseg->qpn_ds = cpu_to_be32((sq->sqn << 8) | ds_cnt);
+ cseg->fm_ce_se = MLX5_WQE_CTRL_CQ_UPDATE;
+
+ sq->skb[pi] = skb;
+
+ MLX5E_TX_SKB_CB(skb)->num_wqebbs = DIV_ROUND_UP(ds_cnt,
+ MLX5_SEND_WQEBB_NUM_DS);
+ sq->pc += MLX5E_TX_SKB_CB(skb)->num_wqebbs;
+
+ netdev_tx_sent_queue(sq->txq, MLX5E_TX_SKB_CB(skb)->num_bytes);
+
+ if (unlikely(!mlx5e_sq_has_room_for(sq, MLX5_SEND_WQE_MAX_WQEBBS))) {
+ netif_tx_stop_queue(sq->txq);
+ sq->stats.stopped++;
+ }
+
+ if (!skb->xmit_more || netif_xmit_stopped(sq->txq))
+ mlx5e_tx_notify_hw(sq, wqe);
+
+ sq->stats.packets++;
+ return NETDEV_TX_OK;
+
+dma_unmap_wqe_err:
+ sq->stats.dropped++;
+ mlx5e_dma_unmap_wqe_err(sq, skb);
+
+ dev_kfree_skb_any(skb);
+
+ return NETDEV_TX_OK;
+}
+
+netdev_tx_t mlx5e_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct mlx5e_priv *priv = netdev_priv(dev);
+ int ix = skb->queue_mapping;
+ int tc = 0;
+ struct mlx5e_channel *c = priv->channel[ix];
+ struct mlx5e_sq *sq = &c->sq[tc];
+
+ return mlx5e_sq_xmit(sq, skb);
+}
+
+netdev_tx_t mlx5e_xmit_multi_tc(struct sk_buff *skb, struct net_device *dev)
+{
+ struct mlx5e_priv *priv = netdev_priv(dev);
+ int ix = skb->queue_mapping & priv->queue_mapping_channel_mask;
+ int tc = skb->queue_mapping >> priv->order_base_2_num_channels;
+ struct mlx5e_channel *c = priv->channel[ix];
+ struct mlx5e_sq *sq = &c->sq[tc];
+
+ return mlx5e_sq_xmit(sq, skb);
+}
+
+bool mlx5e_poll_tx_cq(struct mlx5e_cq *cq)
+{
+ struct mlx5e_sq *sq;
+ u32 dma_fifo_cc;
+ u32 nbytes;
+ u16 npkts;
+ u16 sqcc;
+ int i;
+
+ /* avoid accessing cq (dma coherent memory) if not needed */
+ if (!test_and_clear_bit(MLX5E_CQ_HAS_CQES, &cq->flags))
+ return false;
+
+ sq = cq->sqrq;
+
+ npkts = 0;
+ nbytes = 0;
+
+ /* sq->cc must be updated only after mlx5_cqwq_update_db_record(),
+ * otherwise a cq overrun may occur */
+ sqcc = sq->cc;
+
+ /* avoid dirtying sq cache line every cqe */
+ dma_fifo_cc = sq->dma_fifo_cc;
+
+ for (i = 0; i < MLX5E_TX_CQ_POLL_BUDGET; i++) {
+ struct mlx5_cqe64 *cqe;
+ struct sk_buff *skb;
+ u16 ci;
+ int j;
+
+ cqe = mlx5e_get_cqe(cq);
+ if (!cqe)
+ break;
+
+ ci = sqcc & sq->wq.sz_m1;
+ skb = sq->skb[ci];
+
+ if (unlikely(!skb)) { /* nop */
+ sq->stats.nop++;
+ sqcc++;
+ goto free_skb;
+ }
+
+ for (j = 0; j < MLX5E_TX_SKB_CB(skb)->num_dma; j++) {
+ dma_addr_t addr;
+ u32 size;
+
+ mlx5e_dma_get(sq, dma_fifo_cc, &addr, &size);
+ dma_fifo_cc++;
+ dma_unmap_single(sq->pdev, addr, size, DMA_TO_DEVICE);
+ }
+
+ npkts++;
+ nbytes += MLX5E_TX_SKB_CB(skb)->num_bytes;
+ sqcc += MLX5E_TX_SKB_CB(skb)->num_wqebbs;
+
+free_skb:
+ dev_kfree_skb(skb);
+ }
+
+ mlx5_cqwq_update_db_record(&cq->wq);
+
+ /* ensure cq space is freed before enabling more cqes */
+ wmb();
+
+ sq->dma_fifo_cc = dma_fifo_cc;
+ sq->cc = sqcc;
+
+ netdev_tx_completed_queue(sq->txq, npkts, nbytes);
+
+ if (netif_tx_queue_stopped(sq->txq) &&
+ mlx5e_sq_has_room_for(sq, MLX5_SEND_WQE_MAX_WQEBBS) &&
+ likely(test_bit(MLX5E_SQ_STATE_WAKE_TXQ_ENABLE, &sq->state))) {
+ netif_tx_wake_queue(sq->txq);
+ sq->stats.wake++;
+ }
+ if (i == MLX5E_TX_CQ_POLL_BUDGET) {
+ set_bit(MLX5E_CQ_HAS_CQES, &cq->flags);
+ return true;
+ }
+
+ return false;
+}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c
new file mode 100644
index 0000000..088bc42
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2015, 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 "en.h"
+
+struct mlx5_cqe64 *mlx5e_get_cqe(struct mlx5e_cq *cq)
+{
+ struct mlx5_cqwq *wq = &cq->wq;
+ u32 ci = mlx5_cqwq_get_ci(wq);
+ struct mlx5_cqe64 *cqe = mlx5_cqwq_get_wqe(wq, ci);
+ int cqe_ownership_bit = cqe->op_own & MLX5_CQE_OWNER_MASK;
+ int sw_ownership_val = mlx5_cqwq_get_wrap_cnt(wq) & 1;
+
+ if (cqe_ownership_bit != sw_ownership_val)
+ return NULL;
+
+ mlx5_cqwq_pop(wq);
+
+ /* ensure cqe content is read after cqe ownership bit */
+ rmb();
+
+ return cqe;
+}
+
+int mlx5e_napi_poll(struct napi_struct *napi, int budget)
+{
+ struct mlx5e_channel *c = container_of(napi, struct mlx5e_channel,
+ napi);
+ bool busy = false;
+ int i;
+
+ clear_bit(MLX5E_CHANNEL_NAPI_SCHED, &c->flags);
+
+ for (i = 0; i < c->num_tc; i++)
+ busy |= mlx5e_poll_tx_cq(&c->sq[i].cq);
+
+ busy |= mlx5e_poll_rx_cq(&c->rq.cq, budget);
+
+ busy |= mlx5e_post_rx_wqes(c->rq.cq.sqrq);
+
+ if (busy)
+ return budget;
+
+ napi_complete(napi);
+
+ /* avoid losing completion event during/after polling cqs */
+ if (test_bit(MLX5E_CHANNEL_NAPI_SCHED, &c->flags)) {
+ napi_schedule(napi);
+ return 0;
+ }
+
+ for (i = 0; i < c->num_tc; i++)
+ mlx5e_cq_arm(&c->sq[i].cq);
+ mlx5e_cq_arm(&c->rq.cq);
+
+ return 0;
+}
+
+void mlx5e_completion_event(struct mlx5_core_cq *mcq)
+{
+ struct mlx5e_cq *cq = container_of(mcq, struct mlx5e_cq, mcq);
+
+ set_bit(MLX5E_CQ_HAS_CQES, &cq->flags);
+ set_bit(MLX5E_CHANNEL_NAPI_SCHED, &cq->channel->flags);
+ barrier();
+ napi_schedule(cq->napi);
+}
+
+void mlx5e_cq_error_event(struct mlx5_core_cq *mcq, enum mlx5_event event)
+{
+ struct mlx5e_cq *cq = container_of(mcq, struct mlx5e_cq, mcq);
+ struct mlx5e_channel *c = cq->channel;
+ struct mlx5e_priv *priv = c->priv;
+ struct net_device *netdev = priv->netdev;
+
+ netdev_err(netdev, "%s: cqn=0x%.6x event=0x%.2x\n",
+ __func__, mcq->cqn, event);
+}
--
1.9.3
--
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