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e586b3b0 AV |
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> | |
7ae92ae5 | 36 | #include <net/busy_poll.h> |
e586b3b0 AV |
37 | #include "en.h" |
38 | ||
ef9814de EBE |
39 | static inline bool mlx5e_rx_hw_stamp(struct mlx5e_tstamp *tstamp) |
40 | { | |
41 | return tstamp->hwtstamp_config.rx_filter == HWTSTAMP_FILTER_ALL; | |
42 | } | |
43 | ||
e586b3b0 AV |
44 | static inline int mlx5e_alloc_rx_wqe(struct mlx5e_rq *rq, |
45 | struct mlx5e_rx_wqe *wqe, u16 ix) | |
46 | { | |
47 | struct sk_buff *skb; | |
48 | dma_addr_t dma_addr; | |
49 | ||
50 | skb = netdev_alloc_skb(rq->netdev, rq->wqe_sz); | |
51 | if (unlikely(!skb)) | |
52 | return -ENOMEM; | |
53 | ||
e586b3b0 AV |
54 | dma_addr = dma_map_single(rq->pdev, |
55 | /* hw start padding */ | |
fc11fbf9 SM |
56 | skb->data, |
57 | /* hw end padding */ | |
e586b3b0 AV |
58 | rq->wqe_sz, |
59 | DMA_FROM_DEVICE); | |
60 | ||
61 | if (unlikely(dma_mapping_error(rq->pdev, dma_addr))) | |
62 | goto err_free_skb; | |
63 | ||
fc11fbf9 SM |
64 | skb_reserve(skb, MLX5E_NET_IP_ALIGN); |
65 | ||
e586b3b0 AV |
66 | *((dma_addr_t *)skb->cb) = dma_addr; |
67 | wqe->data.addr = cpu_to_be64(dma_addr + MLX5E_NET_IP_ALIGN); | |
68 | ||
69 | rq->skb[ix] = skb; | |
70 | ||
71 | return 0; | |
72 | ||
73 | err_free_skb: | |
74 | dev_kfree_skb(skb); | |
75 | ||
76 | return -ENOMEM; | |
77 | } | |
78 | ||
79 | bool mlx5e_post_rx_wqes(struct mlx5e_rq *rq) | |
80 | { | |
81 | struct mlx5_wq_ll *wq = &rq->wq; | |
82 | ||
83 | if (unlikely(!test_bit(MLX5E_RQ_STATE_POST_WQES_ENABLE, &rq->state))) | |
84 | return false; | |
85 | ||
86 | while (!mlx5_wq_ll_is_full(wq)) { | |
87 | struct mlx5e_rx_wqe *wqe = mlx5_wq_ll_get_wqe(wq, wq->head); | |
88 | ||
89 | if (unlikely(mlx5e_alloc_rx_wqe(rq, wqe, wq->head))) | |
90 | break; | |
91 | ||
92 | mlx5_wq_ll_push(wq, be16_to_cpu(wqe->next.next_wqe_index)); | |
93 | } | |
94 | ||
95 | /* ensure wqes are visible to device before updating doorbell record */ | |
96 | dma_wmb(); | |
97 | ||
98 | mlx5_wq_ll_update_db_record(wq); | |
99 | ||
100 | return !mlx5_wq_ll_is_full(wq); | |
101 | } | |
102 | ||
103 | static void mlx5e_lro_update_hdr(struct sk_buff *skb, struct mlx5_cqe64 *cqe) | |
104 | { | |
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); | |
108 | struct tcphdr *tcp; | |
109 | ||
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)); | |
113 | ||
114 | u16 tot_len = be32_to_cpu(cqe->byte_cnt) - ETH_HLEN; | |
115 | ||
116 | if (eth->h_proto == htons(ETH_P_IP)) { | |
117 | tcp = (struct tcphdr *)(skb->data + ETH_HLEN + | |
118 | sizeof(struct iphdr)); | |
119 | ipv6 = NULL; | |
d9a40271 | 120 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
e586b3b0 AV |
121 | } else { |
122 | tcp = (struct tcphdr *)(skb->data + ETH_HLEN + | |
123 | sizeof(struct ipv6hdr)); | |
124 | ipv4 = NULL; | |
d9a40271 | 125 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
e586b3b0 AV |
126 | } |
127 | ||
128 | if (get_cqe_lro_tcppsh(cqe)) | |
129 | tcp->psh = 1; | |
130 | ||
131 | if (tcp_ack) { | |
132 | tcp->ack = 1; | |
133 | tcp->ack_seq = cqe->lro_ack_seq_num; | |
134 | tcp->window = cqe->lro_tcp_win; | |
135 | } | |
136 | ||
137 | if (ipv4) { | |
138 | ipv4->ttl = cqe->lro_min_ttl; | |
139 | ipv4->tot_len = cpu_to_be16(tot_len); | |
140 | ipv4->check = 0; | |
141 | ipv4->check = ip_fast_csum((unsigned char *)ipv4, | |
142 | ipv4->ihl); | |
143 | } else { | |
144 | ipv6->hop_limit = cqe->lro_min_ttl; | |
145 | ipv6->payload_len = cpu_to_be16(tot_len - | |
146 | sizeof(struct ipv6hdr)); | |
147 | } | |
148 | } | |
149 | ||
150 | static inline void mlx5e_skb_set_hash(struct mlx5_cqe64 *cqe, | |
151 | struct sk_buff *skb) | |
152 | { | |
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 : | |
156 | PKT_HASH_TYPE_NONE; | |
157 | skb_set_hash(skb, be32_to_cpu(cqe->rss_hash_result), ht); | |
158 | } | |
159 | ||
bbceefce AS |
160 | static inline bool is_first_ethertype_ip(struct sk_buff *skb) |
161 | { | |
162 | __be16 ethertype = ((struct ethhdr *)skb->data)->h_proto; | |
163 | ||
164 | return (ethertype == htons(ETH_P_IP) || ethertype == htons(ETH_P_IPV6)); | |
165 | } | |
166 | ||
167 | static inline void mlx5e_handle_csum(struct net_device *netdev, | |
168 | struct mlx5_cqe64 *cqe, | |
169 | struct mlx5e_rq *rq, | |
170 | struct sk_buff *skb) | |
171 | { | |
172 | if (unlikely(!(netdev->features & NETIF_F_RXCSUM))) | |
173 | goto csum_none; | |
174 | ||
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; | |
ecf842f6 | 179 | skb->csum = csum_unfold((__force __sum16)cqe->check_sum); |
bbceefce AS |
180 | rq->stats.csum_sw++; |
181 | } else { | |
182 | goto csum_none; | |
183 | } | |
184 | ||
185 | return; | |
186 | ||
187 | csum_none: | |
188 | skb->ip_summed = CHECKSUM_NONE; | |
189 | rq->stats.csum_none++; | |
190 | } | |
191 | ||
e586b3b0 AV |
192 | static inline void mlx5e_build_rx_skb(struct mlx5_cqe64 *cqe, |
193 | struct mlx5e_rq *rq, | |
194 | struct sk_buff *skb) | |
195 | { | |
196 | struct net_device *netdev = rq->netdev; | |
197 | u32 cqe_bcnt = be32_to_cpu(cqe->byte_cnt); | |
ef9814de | 198 | struct mlx5e_tstamp *tstamp = rq->tstamp; |
e586b3b0 AV |
199 | int lro_num_seg; |
200 | ||
201 | skb_put(skb, cqe_bcnt); | |
202 | ||
203 | lro_num_seg = be32_to_cpu(cqe->srqn) >> 24; | |
204 | if (lro_num_seg > 1) { | |
205 | mlx5e_lro_update_hdr(skb, cqe); | |
d9a40271 | 206 | skb_shinfo(skb)->gso_size = DIV_ROUND_UP(cqe_bcnt, lro_num_seg); |
e586b3b0 AV |
207 | rq->stats.lro_packets++; |
208 | rq->stats.lro_bytes += cqe_bcnt; | |
209 | } | |
210 | ||
ef9814de EBE |
211 | if (unlikely(mlx5e_rx_hw_stamp(tstamp))) |
212 | mlx5e_fill_hwstamp(tstamp, get_cqe_ts(cqe), skb_hwtstamps(skb)); | |
213 | ||
bbceefce | 214 | mlx5e_handle_csum(netdev, cqe, rq, skb); |
e586b3b0 AV |
215 | |
216 | skb->protocol = eth_type_trans(skb, netdev); | |
217 | ||
218 | skb_record_rx_queue(skb, rq->ix); | |
219 | ||
220 | if (likely(netdev->features & NETIF_F_RXHASH)) | |
221 | mlx5e_skb_set_hash(cqe, skb); | |
222 | ||
223 | if (cqe_has_vlan(cqe)) | |
224 | __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), | |
225 | be16_to_cpu(cqe->vlan_info)); | |
226 | } | |
227 | ||
44fb6fbb | 228 | int mlx5e_poll_rx_cq(struct mlx5e_cq *cq, int budget) |
e586b3b0 | 229 | { |
e3391054 | 230 | struct mlx5e_rq *rq = container_of(cq, struct mlx5e_rq, cq); |
44fb6fbb | 231 | int work_done; |
e586b3b0 | 232 | |
44fb6fbb | 233 | for (work_done = 0; work_done < budget; work_done++) { |
e586b3b0 AV |
234 | struct mlx5e_rx_wqe *wqe; |
235 | struct mlx5_cqe64 *cqe; | |
236 | struct sk_buff *skb; | |
237 | __be16 wqe_counter_be; | |
238 | u16 wqe_counter; | |
239 | ||
240 | cqe = mlx5e_get_cqe(cq); | |
241 | if (!cqe) | |
242 | break; | |
243 | ||
a1f5a1a8 AS |
244 | mlx5_cqwq_pop(&cq->wq); |
245 | ||
e586b3b0 AV |
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]; | |
99611ba1 | 250 | prefetch(skb->data); |
e586b3b0 AV |
251 | rq->skb[wqe_counter] = NULL; |
252 | ||
253 | dma_unmap_single(rq->pdev, | |
254 | *((dma_addr_t *)skb->cb), | |
fc11fbf9 | 255 | rq->wqe_sz, |
e586b3b0 AV |
256 | DMA_FROM_DEVICE); |
257 | ||
258 | if (unlikely((cqe->op_own >> 4) != MLX5_CQE_RESP_SEND)) { | |
259 | rq->stats.wqe_err++; | |
260 | dev_kfree_skb(skb); | |
261 | goto wq_ll_pop; | |
262 | } | |
263 | ||
264 | mlx5e_build_rx_skb(cqe, rq, skb); | |
265 | rq->stats.packets++; | |
b081da5e | 266 | rq->stats.bytes += be32_to_cpu(cqe->byte_cnt); |
e586b3b0 AV |
267 | napi_gro_receive(cq->napi, skb); |
268 | ||
269 | wq_ll_pop: | |
270 | mlx5_wq_ll_pop(&rq->wq, wqe_counter_be, | |
271 | &wqe->next.next_wqe_index); | |
272 | } | |
273 | ||
274 | mlx5_cqwq_update_db_record(&cq->wq); | |
275 | ||
276 | /* ensure cq space is freed before enabling more cqes */ | |
277 | wmb(); | |
278 | ||
44fb6fbb | 279 | return work_done; |
e586b3b0 | 280 | } |