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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 "en.h" | |
34 | ||
35 | struct mlx5_cqe64 *mlx5e_get_cqe(struct mlx5e_cq *cq) | |
36 | { | |
37 | struct mlx5_cqwq *wq = &cq->wq; | |
38 | u32 ci = mlx5_cqwq_get_ci(wq); | |
39 | struct mlx5_cqe64 *cqe = mlx5_cqwq_get_wqe(wq, ci); | |
40 | int cqe_ownership_bit = cqe->op_own & MLX5_CQE_OWNER_MASK; | |
41 | int sw_ownership_val = mlx5_cqwq_get_wrap_cnt(wq) & 1; | |
42 | ||
43 | if (cqe_ownership_bit != sw_ownership_val) | |
44 | return NULL; | |
45 | ||
46 | mlx5_cqwq_pop(wq); | |
47 | ||
48 | /* ensure cqe content is read after cqe ownership bit */ | |
49 | rmb(); | |
50 | ||
51 | return cqe; | |
52 | } | |
53 | ||
54 | int mlx5e_napi_poll(struct napi_struct *napi, int budget) | |
55 | { | |
56 | struct mlx5e_channel *c = container_of(napi, struct mlx5e_channel, | |
57 | napi); | |
58 | bool busy = false; | |
59 | int i; | |
60 | ||
61 | clear_bit(MLX5E_CHANNEL_NAPI_SCHED, &c->flags); | |
62 | ||
63 | for (i = 0; i < c->num_tc; i++) | |
64 | busy |= mlx5e_poll_tx_cq(&c->sq[i].cq); | |
65 | ||
66 | busy |= mlx5e_poll_rx_cq(&c->rq.cq, budget); | |
67 | ||
68 | busy |= mlx5e_post_rx_wqes(c->rq.cq.sqrq); | |
69 | ||
70 | if (busy) | |
71 | return budget; | |
72 | ||
73 | napi_complete(napi); | |
74 | ||
75 | /* avoid losing completion event during/after polling cqs */ | |
76 | if (test_bit(MLX5E_CHANNEL_NAPI_SCHED, &c->flags)) { | |
77 | napi_schedule(napi); | |
78 | return 0; | |
79 | } | |
80 | ||
81 | for (i = 0; i < c->num_tc; i++) | |
82 | mlx5e_cq_arm(&c->sq[i].cq); | |
83 | mlx5e_cq_arm(&c->rq.cq); | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | void mlx5e_completion_event(struct mlx5_core_cq *mcq) | |
89 | { | |
90 | struct mlx5e_cq *cq = container_of(mcq, struct mlx5e_cq, mcq); | |
91 | ||
92 | set_bit(MLX5E_CQ_HAS_CQES, &cq->flags); | |
93 | set_bit(MLX5E_CHANNEL_NAPI_SCHED, &cq->channel->flags); | |
94 | barrier(); | |
95 | napi_schedule(cq->napi); | |
96 | } | |
97 | ||
98 | void mlx5e_cq_error_event(struct mlx5_core_cq *mcq, enum mlx5_event event) | |
99 | { | |
100 | struct mlx5e_cq *cq = container_of(mcq, struct mlx5e_cq, mcq); | |
101 | struct mlx5e_channel *c = cq->channel; | |
102 | struct mlx5e_priv *priv = c->priv; | |
103 | struct net_device *netdev = priv->netdev; | |
104 | ||
105 | netdev_err(netdev, "%s: cqn=0x%.6x event=0x%.2x\n", | |
106 | __func__, mcq->cqn, event); | |
107 | } |