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/irq.h>
34#include <net/xdp_sock_drv.h>
35#include "en.h"
36#include "en/txrx.h"
37#include "en/xdp.h"
38#include "en/xsk/rx.h"
39#include "en/xsk/tx.h"
40#include "en_accel/ktls_txrx.h"
41
42static inline bool mlx5e_channel_no_affinity_change(struct mlx5e_channel *c)
43{
44 int current_cpu = smp_processor_id();
45
46 return cpumask_test_cpu(cpu: current_cpu, cpumask: c->aff_mask);
47}
48
49static void mlx5e_handle_tx_dim(struct mlx5e_txqsq *sq)
50{
51 struct mlx5e_sq_stats *stats = sq->stats;
52 struct dim_sample dim_sample = {};
53
54 if (unlikely(!test_bit(MLX5E_SQ_STATE_DIM, &sq->state)))
55 return;
56
57 dim_update_sample(event_ctr: sq->cq.event_ctr, packets: stats->packets, bytes: stats->bytes, s: &dim_sample);
58 net_dim(dim: &sq->dim, end_sample: dim_sample);
59}
60
61static void mlx5e_handle_rx_dim(struct mlx5e_rq *rq)
62{
63 struct mlx5e_rq_stats *stats = rq->stats;
64 struct dim_sample dim_sample = {};
65
66 if (unlikely(!test_bit(MLX5E_RQ_STATE_DIM, &rq->state)))
67 return;
68
69 dim_update_sample(event_ctr: rq->cq.event_ctr, packets: stats->packets, bytes: stats->bytes, s: &dim_sample);
70 net_dim(dim: &rq->dim, end_sample: dim_sample);
71}
72
73void mlx5e_trigger_irq(struct mlx5e_icosq *sq)
74{
75 struct mlx5_wq_cyc *wq = &sq->wq;
76 struct mlx5e_tx_wqe *nopwqe;
77 u16 pi = mlx5_wq_cyc_ctr2ix(wq, ctr: sq->pc);
78
79 sq->db.wqe_info[pi] = (struct mlx5e_icosq_wqe_info) {
80 .wqe_type = MLX5E_ICOSQ_WQE_NOP,
81 .num_wqebbs = 1,
82 };
83
84 nopwqe = mlx5e_post_nop(wq, sqn: sq->sqn, pc: &sq->pc);
85 mlx5e_notify_hw(wq, pc: sq->pc, uar_map: sq->uar_map, ctrl: &nopwqe->ctrl);
86}
87
88static bool mlx5e_napi_xsk_post(struct mlx5e_xdpsq *xsksq, struct mlx5e_rq *xskrq)
89{
90 bool need_wakeup = xsk_uses_need_wakeup(pool: xskrq->xsk_pool);
91 bool busy_xsk = false, xsk_rx_alloc_err;
92
93 /* If SQ is empty, there are no TX completions to trigger NAPI, so set
94 * need_wakeup. Do it before queuing packets for TX to avoid race
95 * condition with userspace.
96 */
97 if (need_wakeup && xsksq->pc == xsksq->cc)
98 xsk_set_tx_need_wakeup(pool: xsksq->xsk_pool);
99 busy_xsk |= mlx5e_xsk_tx(sq: xsksq, MLX5E_TX_XSK_POLL_BUDGET);
100 /* If we queued some packets for TX, no need for wakeup anymore. */
101 if (need_wakeup && xsksq->pc != xsksq->cc)
102 xsk_clear_tx_need_wakeup(pool: xsksq->xsk_pool);
103
104 /* If WQ is empty, RX won't trigger NAPI, so set need_wakeup. Do it
105 * before refilling to avoid race condition with userspace.
106 */
107 if (need_wakeup && !mlx5e_rqwq_get_cur_sz(rq: xskrq))
108 xsk_set_rx_need_wakeup(pool: xskrq->xsk_pool);
109 xsk_rx_alloc_err = INDIRECT_CALL_2(xskrq->post_wqes,
110 mlx5e_post_rx_mpwqes,
111 mlx5e_post_rx_wqes,
112 xskrq);
113 /* Ask for wakeup if WQ is not full after refill. */
114 if (!need_wakeup)
115 busy_xsk |= xsk_rx_alloc_err;
116 else if (xsk_rx_alloc_err)
117 xsk_set_rx_need_wakeup(pool: xskrq->xsk_pool);
118 else
119 xsk_clear_rx_need_wakeup(pool: xskrq->xsk_pool);
120
121 return busy_xsk;
122}
123
124int mlx5e_napi_poll(struct napi_struct *napi, int budget)
125{
126 struct mlx5e_channel *c = container_of(napi, struct mlx5e_channel,
127 napi);
128 struct mlx5e_ch_stats *ch_stats = c->stats;
129 struct mlx5e_xdpsq *xsksq = &c->xsksq;
130 struct mlx5e_txqsq __rcu **qos_sqs;
131 struct mlx5e_rq *xskrq = &c->xskrq;
132 struct mlx5e_rq *rq = &c->rq;
133 bool aff_change = false;
134 bool busy_xsk = false;
135 bool busy = false;
136 int work_done = 0;
137 u16 qos_sqs_size;
138 bool xsk_open;
139 int i;
140
141 rcu_read_lock();
142
143 qos_sqs = rcu_dereference(c->qos_sqs);
144
145 xsk_open = test_bit(MLX5E_CHANNEL_STATE_XSK, c->state);
146
147 ch_stats->poll++;
148
149 for (i = 0; i < c->num_tc; i++)
150 busy |= mlx5e_poll_tx_cq(cq: &c->sq[i].cq, napi_budget: budget);
151
152 if (unlikely(qos_sqs)) {
153 smp_rmb(); /* Pairs with mlx5e_qos_alloc_queues. */
154 qos_sqs_size = READ_ONCE(c->qos_sqs_size);
155
156 for (i = 0; i < qos_sqs_size; i++) {
157 struct mlx5e_txqsq *sq = rcu_dereference(qos_sqs[i]);
158
159 if (sq)
160 busy |= mlx5e_poll_tx_cq(cq: &sq->cq, napi_budget: budget);
161 }
162 }
163
164 /* budget=0 means we may be in IRQ context, do as little as possible */
165 if (unlikely(!budget))
166 goto out;
167
168 busy |= mlx5e_poll_xdpsq_cq(cq: &c->xdpsq.cq);
169
170 if (c->xdp)
171 busy |= mlx5e_poll_xdpsq_cq(cq: &c->rq_xdpsq.cq);
172
173 if (xsk_open)
174 work_done = mlx5e_poll_rx_cq(cq: &xskrq->cq, budget);
175
176 if (likely(budget - work_done))
177 work_done += mlx5e_poll_rx_cq(cq: &rq->cq, budget: budget - work_done);
178
179 busy |= work_done == budget;
180
181 mlx5e_poll_ico_cq(cq: &c->icosq.cq);
182 if (mlx5e_poll_ico_cq(cq: &c->async_icosq.cq))
183 /* Don't clear the flag if nothing was polled to prevent
184 * queueing more WQEs and overflowing the async ICOSQ.
185 */
186 clear_bit(nr: MLX5E_SQ_STATE_PENDING_XSK_TX, addr: &c->async_icosq.state);
187
188 /* Keep after async ICOSQ CQ poll */
189 if (unlikely(mlx5e_ktls_rx_pending_resync_list(c, budget)))
190 busy |= mlx5e_ktls_rx_handle_resync_list(c, budget);
191
192 busy |= INDIRECT_CALL_2(rq->post_wqes,
193 mlx5e_post_rx_mpwqes,
194 mlx5e_post_rx_wqes,
195 rq);
196 if (xsk_open) {
197 busy |= mlx5e_poll_xdpsq_cq(cq: &xsksq->cq);
198 busy_xsk |= mlx5e_napi_xsk_post(xsksq, xskrq);
199 }
200
201 busy |= busy_xsk;
202
203 if (busy) {
204 if (likely(mlx5e_channel_no_affinity_change(c))) {
205 work_done = budget;
206 goto out;
207 }
208 ch_stats->aff_change++;
209 aff_change = true;
210 if (work_done == budget)
211 work_done--;
212 }
213
214 if (unlikely(!napi_complete_done(napi, work_done)))
215 goto out;
216
217 ch_stats->arm++;
218
219 for (i = 0; i < c->num_tc; i++) {
220 mlx5e_handle_tx_dim(sq: &c->sq[i]);
221 mlx5e_cq_arm(cq: &c->sq[i].cq);
222 }
223 if (unlikely(qos_sqs)) {
224 for (i = 0; i < qos_sqs_size; i++) {
225 struct mlx5e_txqsq *sq = rcu_dereference(qos_sqs[i]);
226
227 if (sq) {
228 mlx5e_handle_tx_dim(sq);
229 mlx5e_cq_arm(cq: &sq->cq);
230 }
231 }
232 }
233
234 mlx5e_handle_rx_dim(rq);
235
236 mlx5e_cq_arm(cq: &rq->cq);
237 mlx5e_cq_arm(cq: &c->icosq.cq);
238 mlx5e_cq_arm(cq: &c->async_icosq.cq);
239 mlx5e_cq_arm(cq: &c->xdpsq.cq);
240
241 if (xsk_open) {
242 mlx5e_handle_rx_dim(rq: xskrq);
243 mlx5e_cq_arm(cq: &xsksq->cq);
244 mlx5e_cq_arm(cq: &xskrq->cq);
245 }
246
247 if (unlikely(aff_change && busy_xsk)) {
248 mlx5e_trigger_irq(sq: &c->icosq);
249 ch_stats->force_irq++;
250 }
251
252out:
253 rcu_read_unlock();
254
255 return work_done;
256}
257
258void mlx5e_completion_event(struct mlx5_core_cq *mcq, struct mlx5_eqe *eqe)
259{
260 struct mlx5e_cq *cq = container_of(mcq, struct mlx5e_cq, mcq);
261
262 napi_schedule(n: cq->napi);
263 cq->event_ctr++;
264 cq->ch_stats->events++;
265}
266
267void mlx5e_cq_error_event(struct mlx5_core_cq *mcq, enum mlx5_event event)
268{
269 struct mlx5e_cq *cq = container_of(mcq, struct mlx5e_cq, mcq);
270 struct net_device *netdev = cq->netdev;
271
272 netdev_err(dev: netdev, format: "%s: cqn=0x%.6x event=0x%.2x\n",
273 __func__, mcq->cqn, event);
274}
275

source code of linux/drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c