Amir Vadai | e586b3b | 2015-05-28 22:28:46 +0300 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2015, Mellanox Technologies. All rights reserved. |
| 3 | * |
| 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: |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or |
| 11 | * without modification, are permitted provided that the following |
| 12 | * conditions are met: |
| 13 | * |
| 14 | * - Redistributions of source code must retain the above |
| 15 | * copyright notice, this list of conditions and the following |
| 16 | * disclaimer. |
| 17 | * |
| 18 | * - Redistributions in binary form must reproduce the above |
| 19 | * copyright notice, this list of conditions and the following |
| 20 | * disclaimer in the documentation and/or other materials |
| 21 | * provided with the distribution. |
| 22 | * |
| 23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| 27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| 28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 30 | * SOFTWARE. |
| 31 | */ |
| 32 | |
| 33 | #include <linux/ip.h> |
| 34 | #include <linux/ipv6.h> |
| 35 | #include <linux/tcp.h> |
| 36 | #include "en.h" |
| 37 | |
| 38 | static inline int mlx5e_alloc_rx_wqe(struct mlx5e_rq *rq, |
| 39 | struct mlx5e_rx_wqe *wqe, u16 ix) |
| 40 | { |
| 41 | struct sk_buff *skb; |
| 42 | dma_addr_t dma_addr; |
| 43 | |
| 44 | skb = netdev_alloc_skb(rq->netdev, rq->wqe_sz); |
| 45 | if (unlikely(!skb)) |
| 46 | return -ENOMEM; |
| 47 | |
Amir Vadai | e586b3b | 2015-05-28 22:28:46 +0300 | [diff] [blame] | 48 | dma_addr = dma_map_single(rq->pdev, |
| 49 | /* hw start padding */ |
Saeed Mahameed | fc11fbf | 2015-06-11 14:47:28 +0300 | [diff] [blame] | 50 | skb->data, |
| 51 | /* hw end padding */ |
Amir Vadai | e586b3b | 2015-05-28 22:28:46 +0300 | [diff] [blame] | 52 | rq->wqe_sz, |
| 53 | DMA_FROM_DEVICE); |
| 54 | |
| 55 | if (unlikely(dma_mapping_error(rq->pdev, dma_addr))) |
| 56 | goto err_free_skb; |
| 57 | |
Saeed Mahameed | fc11fbf | 2015-06-11 14:47:28 +0300 | [diff] [blame] | 58 | skb_reserve(skb, MLX5E_NET_IP_ALIGN); |
| 59 | |
Amir Vadai | e586b3b | 2015-05-28 22:28:46 +0300 | [diff] [blame] | 60 | *((dma_addr_t *)skb->cb) = dma_addr; |
| 61 | wqe->data.addr = cpu_to_be64(dma_addr + MLX5E_NET_IP_ALIGN); |
| 62 | |
| 63 | rq->skb[ix] = skb; |
| 64 | |
| 65 | return 0; |
| 66 | |
| 67 | err_free_skb: |
| 68 | dev_kfree_skb(skb); |
| 69 | |
| 70 | return -ENOMEM; |
| 71 | } |
| 72 | |
| 73 | bool mlx5e_post_rx_wqes(struct mlx5e_rq *rq) |
| 74 | { |
| 75 | struct mlx5_wq_ll *wq = &rq->wq; |
| 76 | |
| 77 | if (unlikely(!test_bit(MLX5E_RQ_STATE_POST_WQES_ENABLE, &rq->state))) |
| 78 | return false; |
| 79 | |
| 80 | while (!mlx5_wq_ll_is_full(wq)) { |
| 81 | struct mlx5e_rx_wqe *wqe = mlx5_wq_ll_get_wqe(wq, wq->head); |
| 82 | |
| 83 | if (unlikely(mlx5e_alloc_rx_wqe(rq, wqe, wq->head))) |
| 84 | break; |
| 85 | |
| 86 | mlx5_wq_ll_push(wq, be16_to_cpu(wqe->next.next_wqe_index)); |
| 87 | } |
| 88 | |
| 89 | /* ensure wqes are visible to device before updating doorbell record */ |
| 90 | dma_wmb(); |
| 91 | |
| 92 | mlx5_wq_ll_update_db_record(wq); |
| 93 | |
| 94 | return !mlx5_wq_ll_is_full(wq); |
| 95 | } |
| 96 | |
| 97 | static void mlx5e_lro_update_hdr(struct sk_buff *skb, struct mlx5_cqe64 *cqe) |
| 98 | { |
| 99 | struct ethhdr *eth = (struct ethhdr *)(skb->data); |
| 100 | struct iphdr *ipv4 = (struct iphdr *)(skb->data + ETH_HLEN); |
| 101 | struct ipv6hdr *ipv6 = (struct ipv6hdr *)(skb->data + ETH_HLEN); |
| 102 | struct tcphdr *tcp; |
| 103 | |
| 104 | u8 l4_hdr_type = get_cqe_l4_hdr_type(cqe); |
| 105 | int tcp_ack = ((CQE_L4_HDR_TYPE_TCP_ACK_NO_DATA == l4_hdr_type) || |
| 106 | (CQE_L4_HDR_TYPE_TCP_ACK_AND_DATA == l4_hdr_type)); |
| 107 | |
| 108 | u16 tot_len = be32_to_cpu(cqe->byte_cnt) - ETH_HLEN; |
| 109 | |
| 110 | if (eth->h_proto == htons(ETH_P_IP)) { |
| 111 | tcp = (struct tcphdr *)(skb->data + ETH_HLEN + |
| 112 | sizeof(struct iphdr)); |
| 113 | ipv6 = NULL; |
Achiad Shochat | d9a4027 | 2015-08-16 16:04:49 +0300 | [diff] [blame] | 114 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
Amir Vadai | e586b3b | 2015-05-28 22:28:46 +0300 | [diff] [blame] | 115 | } else { |
| 116 | tcp = (struct tcphdr *)(skb->data + ETH_HLEN + |
| 117 | sizeof(struct ipv6hdr)); |
| 118 | ipv4 = NULL; |
Achiad Shochat | d9a4027 | 2015-08-16 16:04:49 +0300 | [diff] [blame] | 119 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
Amir Vadai | e586b3b | 2015-05-28 22:28:46 +0300 | [diff] [blame] | 120 | } |
| 121 | |
| 122 | if (get_cqe_lro_tcppsh(cqe)) |
| 123 | tcp->psh = 1; |
| 124 | |
| 125 | if (tcp_ack) { |
| 126 | tcp->ack = 1; |
| 127 | tcp->ack_seq = cqe->lro_ack_seq_num; |
| 128 | tcp->window = cqe->lro_tcp_win; |
| 129 | } |
| 130 | |
| 131 | if (ipv4) { |
| 132 | ipv4->ttl = cqe->lro_min_ttl; |
| 133 | ipv4->tot_len = cpu_to_be16(tot_len); |
| 134 | ipv4->check = 0; |
| 135 | ipv4->check = ip_fast_csum((unsigned char *)ipv4, |
| 136 | ipv4->ihl); |
| 137 | } else { |
| 138 | ipv6->hop_limit = cqe->lro_min_ttl; |
| 139 | ipv6->payload_len = cpu_to_be16(tot_len - |
| 140 | sizeof(struct ipv6hdr)); |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | static inline void mlx5e_skb_set_hash(struct mlx5_cqe64 *cqe, |
| 145 | struct sk_buff *skb) |
| 146 | { |
| 147 | u8 cht = cqe->rss_hash_type; |
| 148 | int ht = (cht & CQE_RSS_HTYPE_L4) ? PKT_HASH_TYPE_L4 : |
| 149 | (cht & CQE_RSS_HTYPE_IP) ? PKT_HASH_TYPE_L3 : |
| 150 | PKT_HASH_TYPE_NONE; |
| 151 | skb_set_hash(skb, be32_to_cpu(cqe->rss_hash_result), ht); |
| 152 | } |
| 153 | |
Achiad Shochat | bbceefc | 2015-08-16 16:04:52 +0300 | [diff] [blame^] | 154 | static inline bool is_first_ethertype_ip(struct sk_buff *skb) |
| 155 | { |
| 156 | __be16 ethertype = ((struct ethhdr *)skb->data)->h_proto; |
| 157 | |
| 158 | return (ethertype == htons(ETH_P_IP) || ethertype == htons(ETH_P_IPV6)); |
| 159 | } |
| 160 | |
| 161 | static inline void mlx5e_handle_csum(struct net_device *netdev, |
| 162 | struct mlx5_cqe64 *cqe, |
| 163 | struct mlx5e_rq *rq, |
| 164 | struct sk_buff *skb) |
| 165 | { |
| 166 | if (unlikely(!(netdev->features & NETIF_F_RXCSUM))) |
| 167 | goto csum_none; |
| 168 | |
| 169 | if (likely(cqe->hds_ip_ext & CQE_L4_OK)) { |
| 170 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 171 | } else if (is_first_ethertype_ip(skb)) { |
| 172 | skb->ip_summed = CHECKSUM_COMPLETE; |
| 173 | skb->csum = csum_unfold(cqe->check_sum); |
| 174 | rq->stats.csum_sw++; |
| 175 | } else { |
| 176 | goto csum_none; |
| 177 | } |
| 178 | |
| 179 | return; |
| 180 | |
| 181 | csum_none: |
| 182 | skb->ip_summed = CHECKSUM_NONE; |
| 183 | rq->stats.csum_none++; |
| 184 | } |
| 185 | |
Amir Vadai | e586b3b | 2015-05-28 22:28:46 +0300 | [diff] [blame] | 186 | static inline void mlx5e_build_rx_skb(struct mlx5_cqe64 *cqe, |
| 187 | struct mlx5e_rq *rq, |
| 188 | struct sk_buff *skb) |
| 189 | { |
| 190 | struct net_device *netdev = rq->netdev; |
| 191 | u32 cqe_bcnt = be32_to_cpu(cqe->byte_cnt); |
| 192 | int lro_num_seg; |
| 193 | |
| 194 | skb_put(skb, cqe_bcnt); |
| 195 | |
| 196 | lro_num_seg = be32_to_cpu(cqe->srqn) >> 24; |
| 197 | if (lro_num_seg > 1) { |
| 198 | mlx5e_lro_update_hdr(skb, cqe); |
Achiad Shochat | d9a4027 | 2015-08-16 16:04:49 +0300 | [diff] [blame] | 199 | skb_shinfo(skb)->gso_size = DIV_ROUND_UP(cqe_bcnt, lro_num_seg); |
Amir Vadai | e586b3b | 2015-05-28 22:28:46 +0300 | [diff] [blame] | 200 | rq->stats.lro_packets++; |
| 201 | rq->stats.lro_bytes += cqe_bcnt; |
| 202 | } |
| 203 | |
Achiad Shochat | bbceefc | 2015-08-16 16:04:52 +0300 | [diff] [blame^] | 204 | mlx5e_handle_csum(netdev, cqe, rq, skb); |
Amir Vadai | e586b3b | 2015-05-28 22:28:46 +0300 | [diff] [blame] | 205 | |
| 206 | skb->protocol = eth_type_trans(skb, netdev); |
| 207 | |
| 208 | skb_record_rx_queue(skb, rq->ix); |
| 209 | |
| 210 | if (likely(netdev->features & NETIF_F_RXHASH)) |
| 211 | mlx5e_skb_set_hash(cqe, skb); |
| 212 | |
| 213 | if (cqe_has_vlan(cqe)) |
| 214 | __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), |
| 215 | be16_to_cpu(cqe->vlan_info)); |
| 216 | } |
| 217 | |
| 218 | bool mlx5e_poll_rx_cq(struct mlx5e_cq *cq, int budget) |
| 219 | { |
Achiad Shochat | e339105 | 2015-06-23 17:14:20 +0300 | [diff] [blame] | 220 | struct mlx5e_rq *rq = container_of(cq, struct mlx5e_rq, cq); |
Amir Vadai | e586b3b | 2015-05-28 22:28:46 +0300 | [diff] [blame] | 221 | int i; |
| 222 | |
| 223 | /* avoid accessing cq (dma coherent memory) if not needed */ |
| 224 | if (!test_and_clear_bit(MLX5E_CQ_HAS_CQES, &cq->flags)) |
| 225 | return false; |
| 226 | |
| 227 | for (i = 0; i < budget; i++) { |
| 228 | struct mlx5e_rx_wqe *wqe; |
| 229 | struct mlx5_cqe64 *cqe; |
| 230 | struct sk_buff *skb; |
| 231 | __be16 wqe_counter_be; |
| 232 | u16 wqe_counter; |
| 233 | |
| 234 | cqe = mlx5e_get_cqe(cq); |
| 235 | if (!cqe) |
| 236 | break; |
| 237 | |
Achiad Shochat | a1f5a1a | 2015-06-23 17:14:21 +0300 | [diff] [blame] | 238 | mlx5_cqwq_pop(&cq->wq); |
| 239 | |
Amir Vadai | e586b3b | 2015-05-28 22:28:46 +0300 | [diff] [blame] | 240 | wqe_counter_be = cqe->wqe_counter; |
| 241 | wqe_counter = be16_to_cpu(wqe_counter_be); |
| 242 | wqe = mlx5_wq_ll_get_wqe(&rq->wq, wqe_counter); |
| 243 | skb = rq->skb[wqe_counter]; |
Saeed Mahameed | 99611ba | 2015-06-23 17:14:22 +0300 | [diff] [blame] | 244 | prefetch(skb->data); |
Amir Vadai | e586b3b | 2015-05-28 22:28:46 +0300 | [diff] [blame] | 245 | rq->skb[wqe_counter] = NULL; |
| 246 | |
| 247 | dma_unmap_single(rq->pdev, |
| 248 | *((dma_addr_t *)skb->cb), |
Saeed Mahameed | fc11fbf | 2015-06-11 14:47:28 +0300 | [diff] [blame] | 249 | rq->wqe_sz, |
Amir Vadai | e586b3b | 2015-05-28 22:28:46 +0300 | [diff] [blame] | 250 | DMA_FROM_DEVICE); |
| 251 | |
| 252 | if (unlikely((cqe->op_own >> 4) != MLX5_CQE_RESP_SEND)) { |
| 253 | rq->stats.wqe_err++; |
| 254 | dev_kfree_skb(skb); |
| 255 | goto wq_ll_pop; |
| 256 | } |
| 257 | |
| 258 | mlx5e_build_rx_skb(cqe, rq, skb); |
| 259 | rq->stats.packets++; |
| 260 | napi_gro_receive(cq->napi, skb); |
| 261 | |
| 262 | wq_ll_pop: |
| 263 | mlx5_wq_ll_pop(&rq->wq, wqe_counter_be, |
| 264 | &wqe->next.next_wqe_index); |
| 265 | } |
| 266 | |
| 267 | mlx5_cqwq_update_db_record(&cq->wq); |
| 268 | |
| 269 | /* ensure cq space is freed before enabling more cqes */ |
| 270 | wmb(); |
| 271 | |
| 272 | if (i == budget) { |
| 273 | set_bit(MLX5E_CQ_HAS_CQES, &cq->flags); |
| 274 | return true; |
| 275 | } |
| 276 | |
| 277 | return false; |
| 278 | } |