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 "en.h"
  35
  36 static inline bool mlx5e_channel_no_affinity_change(struct mlx5e_channel *c)
  37 {
  38         int current_cpu = smp_processor_id();
  39         const struct cpumask *aff;
  40         struct irq_data *idata;
  41
  42         idata = irq_desc_get_irq_data(c->irq_desc);
  43         aff = irq_data_get_affinity_mask(idata);
  44         return cpumask_test_cpu(current_cpu, aff);
  45 }
  46
  47 int mlx5e_napi_poll(struct napi_struct *napi, int budget)
  48 {
  49         struct mlx5e_channel *c = container_of(napi, struct mlx5e_channel,
  50                                                napi);
  51         bool busy = false;
  52         int work_done = 0;
  53         int i;
  54
  55         for (i = 0; i < c->num_tc; i++)
  56                 busy |= mlx5e_poll_tx_cq(&c->sq[i].cq, budget);
  57
  58         if (c->xdp)
  59                 busy |= mlx5e_poll_xdpsq_cq(&c->rq.xdpsq.cq);
  60
  61         if (likely(budget)) { /* budget=0 means: don't poll rx rings */
  62                 work_done = mlx5e_poll_rx_cq(&c->rq.cq, budget);
  63                 busy |= work_done == budget;
  64         }
  65
  66         busy |= c->rq.post_wqes(&c->rq);
  67
  68         if (busy) {
  69                 if (likely(mlx5e_channel_no_affinity_change(c)))
  70                         return budget;
  71                 if (budget && work_done == budget)
  72                         work_done--;
  73         }
  74
  75         if (unlikely(!napi_complete_done(napi, work_done)))
  76                 return work_done;
  77
  78         for (i = 0; i < c->num_tc; i++)
  79                 mlx5e_cq_arm(&c->sq[i].cq);
  80
  81         if (MLX5E_TEST_BIT(c->rq.state, MLX5E_RQ_STATE_AM))
  82                 mlx5e_rx_am(&c->rq);
  83
  84         mlx5e_cq_arm(&c->rq.cq);
  85         mlx5e_cq_arm(&c->icosq.cq);
  86
  87         return work_done;
  88 }
  89
  90 void mlx5e_completion_event(struct mlx5_core_cq *mcq)
  91 {
  92         struct mlx5e_cq *cq = container_of(mcq, struct mlx5e_cq, mcq);
  93
  94         cq->event_ctr++;
  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 net_device *netdev = c->netdev;
 103
 104         netdev_err(netdev, "%s: cqn=0x%.6x event=0x%.2x\n",
 105                    __func__, mcq->cqn, event);
 106 }