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* 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;
dma_addr = dma_map_single(rq->pdev,
/* hw start padding */
skb->data,
/* hw end padding */
rq->wqe_sz,
DMA_FROM_DEVICE);
if (unlikely(dma_mapping_error(rq->pdev, dma_addr)))
goto err_free_skb;
skb_reserve(skb, MLX5E_NET_IP_ALIGN);
*((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 */
dma_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;
skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
} else {
tcp = (struct tcphdr *)(skb->data + ETH_HLEN +
sizeof(struct ipv6hdr));
ipv4 = NULL;
skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
}
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 bool is_first_ethertype_ip(struct sk_buff *skb)
{
__be16 ethertype = ((struct ethhdr *)skb->data)->h_proto;
return (ethertype == htons(ETH_P_IP) || ethertype == htons(ETH_P_IPV6));
}
static inline void mlx5e_handle_csum(struct net_device *netdev,
struct mlx5_cqe64 *cqe,
struct mlx5e_rq *rq,
struct sk_buff *skb)
{
if (unlikely(!(netdev->features & NETIF_F_RXCSUM)))
goto csum_none;
if (likely(cqe->hds_ip_ext & CQE_L4_OK)) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
} else if (is_first_ethertype_ip(skb)) {
skb->ip_summed = CHECKSUM_COMPLETE;
skb->csum = csum_unfold((__force __sum16)cqe->check_sum);
rq->stats.csum_sw++;
} else {
goto csum_none;
}
return;
csum_none:
skb->ip_summed = CHECKSUM_NONE;
rq->stats.csum_none++;
}
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 = DIV_ROUND_UP(cqe_bcnt, lro_num_seg);
rq->stats.lro_packets++;
rq->stats.lro_bytes += cqe_bcnt;
}
mlx5e_handle_csum(netdev, cqe, rq, skb);
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 = container_of(cq, struct mlx5e_rq, cq);
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;
mlx5_cqwq_pop(&cq->wq);
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];
prefetch(skb->data);
rq->skb[wqe_counter] = NULL;
dma_unmap_single(rq->pdev,
*((dma_addr_t *)skb->cb),
rq->wqe_sz,
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;
}
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