drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c

   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 <linux/indirect_call_wrapper.h>
  35 #include "en.h"
  36 #include "en/xdp.h"
  37 #include "en/xsk/rx.h"
  38 #include "en/xsk/tx.h"
  39
  40 static inline bool mlx5e_channel_no_affinity_change(struct mlx5e_channel *c)
  41 {
  42         int current_cpu = smp_processor_id();
  43         const struct cpumask *aff;
  44         struct irq_data *idata;
  45
  46         idata = irq_desc_get_irq_data(c->irq_desc);
  47         aff = irq_data_get_affinity_mask(idata);
  48         return cpumask_test_cpu(current_cpu, aff);
  49 }
  50
  51 static void mlx5e_handle_tx_dim(struct mlx5e_txqsq *sq)
  52 {
  53         struct mlx5e_sq_stats *stats = sq->stats;
  54         struct dim_sample dim_sample = {};
  55
  56         if (unlikely(!test_bit(MLX5E_SQ_STATE_AM, &sq->state)))
  57                 return;
  58
  59         dim_update_sample(sq->cq.event_ctr, stats->packets, stats->bytes, &dim_sample);
  60         net_dim(&sq->dim, dim_sample);
  61 }
  62
  63 static void mlx5e_handle_rx_dim(struct mlx5e_rq *rq)
  64 {
  65         struct mlx5e_rq_stats *stats = rq->stats;
  66         struct dim_sample dim_sample = {};
  67
  68         if (unlikely(!test_bit(MLX5E_RQ_STATE_AM, &rq->state)))
  69                 return;
  70
  71         dim_update_sample(rq->cq.event_ctr, stats->packets, stats->bytes, &dim_sample);
  72         net_dim(&rq->dim, dim_sample);
  73 }
  74
  75 void mlx5e_trigger_irq(struct mlx5e_icosq *sq)
  76 {
  77         struct mlx5_wq_cyc *wq = &sq->wq;
  78         struct mlx5e_tx_wqe *nopwqe;
  79         u16 pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc);
  80
  81         sq->db.ico_wqe[pi].opcode = MLX5_OPCODE_NOP;
  82         sq->db.ico_wqe[pi].num_wqebbs = 1;
  83         nopwqe = mlx5e_post_nop(wq, sq->sqn, &sq->pc);
  84         mlx5e_notify_hw(wq, sq->pc, sq->uar_map, &nopwqe->ctrl);
  85 }
  86
  87 static bool mlx5e_napi_xsk_post(struct mlx5e_xdpsq *xsksq, struct mlx5e_rq *xskrq)
  88 {
  89         bool busy_xsk = false, xsk_rx_alloc_err;
  90
  91         /* Handle the race between the application querying need_wakeup and the
  92          * driver setting it:
  93          * 1. Update need_wakeup both before and after the TX. If it goes to
  94          * "yes", it can only happen with the first update.
  95          * 2. If the application queried need_wakeup before we set it, the
  96          * packets will be transmitted anyway, even w/o a wakeup.
  97          * 3. Give a chance to clear need_wakeup after new packets were queued
  98          * for TX.
  99          */
 100         mlx5e_xsk_update_tx_wakeup(xsksq);
 101         busy_xsk |= mlx5e_xsk_tx(xsksq, MLX5E_TX_XSK_POLL_BUDGET);
 102         mlx5e_xsk_update_tx_wakeup(xsksq);
 103
 104         xsk_rx_alloc_err = INDIRECT_CALL_2(xskrq->post_wqes,
 105                                            mlx5e_post_rx_mpwqes,
 106                                            mlx5e_post_rx_wqes,
 107                                            xskrq);
 108         busy_xsk |= mlx5e_xsk_update_rx_wakeup(xskrq, xsk_rx_alloc_err);
 109
 110         return busy_xsk;
 111 }
 112
 113 int mlx5e_napi_poll(struct napi_struct *napi, int budget)
 114 {
 115         struct mlx5e_channel *c = container_of(napi, struct mlx5e_channel,
 116                                                napi);
 117         struct mlx5e_ch_stats *ch_stats = c->stats;
 118         struct mlx5e_xdpsq *xsksq = &c->xsksq;
 119         struct mlx5e_rq *xskrq = &c->xskrq;
 120         struct mlx5e_rq *rq = &c->rq;
 121         bool xsk_open = test_bit(MLX5E_CHANNEL_STATE_XSK, c->state);
 122         bool aff_change = false;
 123         bool busy_xsk = false;
 124         bool busy = false;
 125         int work_done = 0;
 126         int i;
 127
 128         ch_stats->poll++;
 129
 130         for (i = 0; i < c->num_tc; i++)
 131                 busy |= mlx5e_poll_tx_cq(&c->sq[i].cq, budget);
 132
 133         busy |= mlx5e_poll_xdpsq_cq(&c->xdpsq.cq);
 134
 135         if (c->xdp)
 136                 busy |= mlx5e_poll_xdpsq_cq(&c->rq_xdpsq.cq);
 137
 138         if (likely(budget)) { /* budget=0 means: don't poll rx rings */
 139                 if (xsk_open)
 140                         work_done = mlx5e_poll_rx_cq(&xskrq->cq, budget);
 141
 142                 if (likely(budget - work_done))
 143                         work_done += mlx5e_poll_rx_cq(&rq->cq, budget - work_done);
 144
 145                 busy |= work_done == budget;
 146         }
 147
 148         mlx5e_poll_ico_cq(&c->icosq.cq);
 149
 150         busy |= INDIRECT_CALL_2(rq->post_wqes,
 151                                 mlx5e_post_rx_mpwqes,
 152                                 mlx5e_post_rx_wqes,
 153                                 rq);
 154         if (xsk_open) {
 155                 mlx5e_poll_ico_cq(&c->xskicosq.cq);
 156                 busy |= mlx5e_poll_xdpsq_cq(&xsksq->cq);
 157                 busy_xsk |= mlx5e_napi_xsk_post(xsksq, xskrq);
 158         }
 159
 160         busy |= busy_xsk;
 161
 162         if (busy) {
 163                 if (likely(mlx5e_channel_no_affinity_change(c)))
 164                         return budget;
 165                 ch_stats->aff_change++;
 166                 aff_change = true;
 167                 if (budget && work_done == budget)
 168                         work_done--;
 169         }
 170
 171         if (unlikely(!napi_complete_done(napi, work_done)))
 172                 return work_done;
 173
 174         ch_stats->arm++;
 175
 176         for (i = 0; i < c->num_tc; i++) {
 177                 mlx5e_handle_tx_dim(&c->sq[i]);
 178                 mlx5e_cq_arm(&c->sq[i].cq);
 179         }
 180
 181         mlx5e_handle_rx_dim(rq);
 182
 183         mlx5e_cq_arm(&rq->cq);
 184         mlx5e_cq_arm(&c->icosq.cq);
 185         mlx5e_cq_arm(&c->xdpsq.cq);
 186
 187         if (xsk_open) {
 188                 mlx5e_handle_rx_dim(xskrq);
 189                 mlx5e_cq_arm(&c->xskicosq.cq);
 190                 mlx5e_cq_arm(&xsksq->cq);
 191                 mlx5e_cq_arm(&xskrq->cq);
 192         }
 193
 194         if (unlikely(aff_change && busy_xsk)) {
 195                 mlx5e_trigger_irq(&c->icosq);
 196                 ch_stats->force_irq++;
 197         }
 198
 199         return work_done;
 200 }
 201
 202 void mlx5e_completion_event(struct mlx5_core_cq *mcq, struct mlx5_eqe *eqe)
 203 {
 204         struct mlx5e_cq *cq = container_of(mcq, struct mlx5e_cq, mcq);
 205
 206         napi_schedule(cq->napi);
 207         cq->event_ctr++;
 208         cq->channel->stats->events++;
 209 }
 210
 211 void mlx5e_cq_error_event(struct mlx5_core_cq *mcq, enum mlx5_event event)
 212 {
 213         struct mlx5e_cq *cq = container_of(mcq, struct mlx5e_cq, mcq);
 214         struct mlx5e_channel *c = cq->channel;
 215         struct net_device *netdev = c->netdev;
 216
 217         netdev_err(netdev, "%s: cqn=0x%.6x event=0x%.2x\n",
 218                    __func__, mcq->cqn, event);
 219 }