2 * Copyright (c) 2015, Mellanox Technologies. All rights reserved.
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
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11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
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21 * provided with the distribution.
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 #include <linux/ipv6.h>
35 #include <linux/tcp.h>
36 #include <net/busy_poll.h>
39 static inline bool mlx5e_rx_hw_stamp(struct mlx5e_tstamp *tstamp)
41 return tstamp->hwtstamp_config.rx_filter == HWTSTAMP_FILTER_ALL;
44 static inline int mlx5e_alloc_rx_wqe(struct mlx5e_rq *rq,
45 struct mlx5e_rx_wqe *wqe, u16 ix)
50 skb = netdev_alloc_skb(rq->netdev, rq->wqe_sz);
54 dma_addr = dma_map_single(rq->pdev,
55 /* hw start padding */
61 if (unlikely(dma_mapping_error(rq->pdev, dma_addr)))
64 skb_reserve(skb, MLX5E_NET_IP_ALIGN);
66 *((dma_addr_t *)skb->cb) = dma_addr;
67 wqe->data.addr = cpu_to_be64(dma_addr + MLX5E_NET_IP_ALIGN);
79 bool mlx5e_post_rx_wqes(struct mlx5e_rq *rq)
81 struct mlx5_wq_ll *wq = &rq->wq;
83 if (unlikely(!test_bit(MLX5E_RQ_STATE_POST_WQES_ENABLE, &rq->state)))
86 while (!mlx5_wq_ll_is_full(wq)) {
87 struct mlx5e_rx_wqe *wqe = mlx5_wq_ll_get_wqe(wq, wq->head);
89 if (unlikely(mlx5e_alloc_rx_wqe(rq, wqe, wq->head)))
92 mlx5_wq_ll_push(wq, be16_to_cpu(wqe->next.next_wqe_index));
95 /* ensure wqes are visible to device before updating doorbell record */
98 mlx5_wq_ll_update_db_record(wq);
100 return !mlx5_wq_ll_is_full(wq);
103 static void mlx5e_lro_update_hdr(struct sk_buff *skb, struct mlx5_cqe64 *cqe)
105 struct ethhdr *eth = (struct ethhdr *)(skb->data);
106 struct iphdr *ipv4 = (struct iphdr *)(skb->data + ETH_HLEN);
107 struct ipv6hdr *ipv6 = (struct ipv6hdr *)(skb->data + ETH_HLEN);
110 u8 l4_hdr_type = get_cqe_l4_hdr_type(cqe);
111 int tcp_ack = ((CQE_L4_HDR_TYPE_TCP_ACK_NO_DATA == l4_hdr_type) ||
112 (CQE_L4_HDR_TYPE_TCP_ACK_AND_DATA == l4_hdr_type));
114 u16 tot_len = be32_to_cpu(cqe->byte_cnt) - ETH_HLEN;
116 if (eth->h_proto == htons(ETH_P_IP)) {
117 tcp = (struct tcphdr *)(skb->data + ETH_HLEN +
118 sizeof(struct iphdr));
120 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
122 tcp = (struct tcphdr *)(skb->data + ETH_HLEN +
123 sizeof(struct ipv6hdr));
125 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
128 if (get_cqe_lro_tcppsh(cqe))
133 tcp->ack_seq = cqe->lro_ack_seq_num;
134 tcp->window = cqe->lro_tcp_win;
138 ipv4->ttl = cqe->lro_min_ttl;
139 ipv4->tot_len = cpu_to_be16(tot_len);
141 ipv4->check = ip_fast_csum((unsigned char *)ipv4,
144 ipv6->hop_limit = cqe->lro_min_ttl;
145 ipv6->payload_len = cpu_to_be16(tot_len -
146 sizeof(struct ipv6hdr));
150 static inline void mlx5e_skb_set_hash(struct mlx5_cqe64 *cqe,
153 u8 cht = cqe->rss_hash_type;
154 int ht = (cht & CQE_RSS_HTYPE_L4) ? PKT_HASH_TYPE_L4 :
155 (cht & CQE_RSS_HTYPE_IP) ? PKT_HASH_TYPE_L3 :
157 skb_set_hash(skb, be32_to_cpu(cqe->rss_hash_result), ht);
160 static inline bool is_first_ethertype_ip(struct sk_buff *skb)
162 __be16 ethertype = ((struct ethhdr *)skb->data)->h_proto;
164 return (ethertype == htons(ETH_P_IP) || ethertype == htons(ETH_P_IPV6));
167 static inline void mlx5e_handle_csum(struct net_device *netdev,
168 struct mlx5_cqe64 *cqe,
172 if (unlikely(!(netdev->features & NETIF_F_RXCSUM)))
175 if (likely(cqe->hds_ip_ext & CQE_L4_OK)) {
176 skb->ip_summed = CHECKSUM_UNNECESSARY;
177 } else if (is_first_ethertype_ip(skb)) {
178 skb->ip_summed = CHECKSUM_COMPLETE;
179 skb->csum = csum_unfold((__force __sum16)cqe->check_sum);
188 skb->ip_summed = CHECKSUM_NONE;
189 rq->stats.csum_none++;
192 static inline void mlx5e_build_rx_skb(struct mlx5_cqe64 *cqe,
196 struct net_device *netdev = rq->netdev;
197 u32 cqe_bcnt = be32_to_cpu(cqe->byte_cnt);
198 struct mlx5e_tstamp *tstamp = rq->tstamp;
201 skb_put(skb, cqe_bcnt);
203 lro_num_seg = be32_to_cpu(cqe->srqn) >> 24;
204 if (lro_num_seg > 1) {
205 mlx5e_lro_update_hdr(skb, cqe);
206 skb_shinfo(skb)->gso_size = DIV_ROUND_UP(cqe_bcnt, lro_num_seg);
207 rq->stats.lro_packets++;
208 rq->stats.lro_bytes += cqe_bcnt;
211 if (unlikely(mlx5e_rx_hw_stamp(tstamp)))
212 mlx5e_fill_hwstamp(tstamp, get_cqe_ts(cqe), skb_hwtstamps(skb));
214 mlx5e_handle_csum(netdev, cqe, rq, skb);
216 skb->protocol = eth_type_trans(skb, netdev);
218 skb_record_rx_queue(skb, rq->ix);
220 if (likely(netdev->features & NETIF_F_RXHASH))
221 mlx5e_skb_set_hash(cqe, skb);
223 if (cqe_has_vlan(cqe))
224 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
225 be16_to_cpu(cqe->vlan_info));
228 int mlx5e_poll_rx_cq(struct mlx5e_cq *cq, int budget)
230 struct mlx5e_rq *rq = container_of(cq, struct mlx5e_rq, cq);
233 for (work_done = 0; work_done < budget; work_done++) {
234 struct mlx5e_rx_wqe *wqe;
235 struct mlx5_cqe64 *cqe;
237 __be16 wqe_counter_be;
240 cqe = mlx5e_get_cqe(cq);
244 mlx5_cqwq_pop(&cq->wq);
246 wqe_counter_be = cqe->wqe_counter;
247 wqe_counter = be16_to_cpu(wqe_counter_be);
248 wqe = mlx5_wq_ll_get_wqe(&rq->wq, wqe_counter);
249 skb = rq->skb[wqe_counter];
251 rq->skb[wqe_counter] = NULL;
253 dma_unmap_single(rq->pdev,
254 *((dma_addr_t *)skb->cb),
258 if (unlikely((cqe->op_own >> 4) != MLX5_CQE_RESP_SEND)) {
264 mlx5e_build_rx_skb(cqe, rq, skb);
266 rq->stats.bytes += be32_to_cpu(cqe->byte_cnt);
267 napi_gro_receive(cq->napi, skb);
270 mlx5_wq_ll_pop(&rq->wq, wqe_counter_be,
271 &wqe->next.next_wqe_index);
274 mlx5_cqwq_update_db_record(&cq->wq);
276 /* ensure cq space is freed before enabling more cqes */