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

   1 /*
   2  * Copyright (c) 2013-2015, 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/kernel.h>
  34 #include <linux/module.h>
  35 #include <linux/hardirq.h>
  36 #include <linux/mlx5/driver.h>
  37 #include <rdma/ib_verbs.h>
  38 #include <linux/mlx5/cq.h>
  39 #include "mlx5_core.h"
  40 #include "lib/eq.h"
  41
  42 #define TASKLET_MAX_TIME 2
  43 #define TASKLET_MAX_TIME_JIFFIES msecs_to_jiffies(TASKLET_MAX_TIME)
  44
  45 void mlx5_cq_tasklet_cb(struct tasklet_struct *t)
  46 {
  47         unsigned long flags;
  48         unsigned long end = jiffies + TASKLET_MAX_TIME_JIFFIES;
  49         struct mlx5_eq_tasklet *ctx = from_tasklet(ctx, t, task);
  50         struct mlx5_core_cq *mcq;
  51         struct mlx5_core_cq *temp;
  52
  53         spin_lock_irqsave(&ctx->lock, flags);
  54         list_splice_tail_init(&ctx->list, &ctx->process_list);
  55         spin_unlock_irqrestore(&ctx->lock, flags);
  56
  57         list_for_each_entry_safe(mcq, temp, &ctx->process_list,
  58                                  tasklet_ctx.list) {
  59                 list_del_init(&mcq->tasklet_ctx.list);
  60                 mcq->tasklet_ctx.comp(mcq, NULL);
  61                 mlx5_cq_put(mcq);
  62                 if (time_after(jiffies, end))
  63                         break;
  64         }
  65
  66         if (!list_empty(&ctx->process_list))
  67                 tasklet_schedule(&ctx->task);
  68 }
  69
  70 static void mlx5_add_cq_to_tasklet(struct mlx5_core_cq *cq,
  71                                    struct mlx5_eqe *eqe)
  72 {
  73         unsigned long flags;
  74         struct mlx5_eq_tasklet *tasklet_ctx = cq->tasklet_ctx.priv;
  75
  76         spin_lock_irqsave(&tasklet_ctx->lock, flags);
  77         /* When migrating CQs between EQs will be implemented, please note
  78          * that you need to sync this point. It is possible that
  79          * while migrating a CQ, completions on the old EQs could
  80          * still arrive.
  81          */
  82         if (list_empty_careful(&cq->tasklet_ctx.list)) {
  83                 mlx5_cq_hold(cq);
  84                 list_add_tail(&cq->tasklet_ctx.list, &tasklet_ctx->list);
  85         }
  86         spin_unlock_irqrestore(&tasklet_ctx->lock, flags);
  87 }
  88
  89 int mlx5_core_create_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
  90                         u32 *in, int inlen, u32 *out, int outlen)
  91 {
  92         int eqn = MLX5_GET(cqc, MLX5_ADDR_OF(create_cq_in, in, cq_context), c_eqn);
  93         u32 din[MLX5_ST_SZ_DW(destroy_cq_in)] = {};
  94         struct mlx5_eq_comp *eq;
  95         int err;
  96
  97         eq = mlx5_eqn2comp_eq(dev, eqn);
  98         if (IS_ERR(eq))
  99                 return PTR_ERR(eq);
 100
 101         memset(out, 0, outlen);
 102         MLX5_SET(create_cq_in, in, opcode, MLX5_CMD_OP_CREATE_CQ);
 103         err = mlx5_cmd_exec(dev, in, inlen, out, outlen);
 104         if (err)
 105                 return err;
 106
 107         cq->cqn = MLX5_GET(create_cq_out, out, cqn);
 108         cq->cons_index = 0;
 109         cq->arm_sn     = 0;
 110         cq->eq         = eq;
 111         cq->uid = MLX5_GET(create_cq_in, in, uid);
 112         refcount_set(&cq->refcount, 1);
 113         init_completion(&cq->free);
 114         if (!cq->comp)
 115                 cq->comp = mlx5_add_cq_to_tasklet;
 116         /* assuming CQ will be deleted before the EQ */
 117         cq->tasklet_ctx.priv = &eq->tasklet_ctx;
 118         INIT_LIST_HEAD(&cq->tasklet_ctx.list);
 119
 120         /* Add to comp EQ CQ tree to recv comp events */
 121         err = mlx5_eq_add_cq(&eq->core, cq);
 122         if (err)
 123                 goto err_cmd;
 124
 125         /* Add to async EQ CQ tree to recv async events */
 126         err = mlx5_eq_add_cq(mlx5_get_async_eq(dev), cq);
 127         if (err)
 128                 goto err_cq_add;
 129
 130         cq->pid = current->pid;
 131         err = mlx5_debug_cq_add(dev, cq);
 132         if (err)
 133                 mlx5_core_dbg(dev, "failed adding CP 0x%x to debug file system\n",
 134                               cq->cqn);
 135
 136         cq->uar = dev->priv.uar;
 137
 138         return 0;
 139
 140 err_cq_add:
 141         mlx5_eq_del_cq(&eq->core, cq);
 142 err_cmd:
 143         MLX5_SET(destroy_cq_in, din, opcode, MLX5_CMD_OP_DESTROY_CQ);
 144         MLX5_SET(destroy_cq_in, din, cqn, cq->cqn);
 145         MLX5_SET(destroy_cq_in, din, uid, cq->uid);
 146         mlx5_cmd_exec_in(dev, destroy_cq, din);
 147         return err;
 148 }
 149 EXPORT_SYMBOL(mlx5_core_create_cq);
 150
 151 int mlx5_core_destroy_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq)
 152 {
 153         u32 in[MLX5_ST_SZ_DW(destroy_cq_in)] = {};
 154         int err;
 155
 156         mlx5_eq_del_cq(mlx5_get_async_eq(dev), cq);
 157         mlx5_eq_del_cq(&cq->eq->core, cq);
 158
 159         MLX5_SET(destroy_cq_in, in, opcode, MLX5_CMD_OP_DESTROY_CQ);
 160         MLX5_SET(destroy_cq_in, in, cqn, cq->cqn);
 161         MLX5_SET(destroy_cq_in, in, uid, cq->uid);
 162         err = mlx5_cmd_exec_in(dev, destroy_cq, in);
 163         if (err)
 164                 return err;
 165
 166         synchronize_irq(cq->irqn);
 167
 168         mlx5_debug_cq_remove(dev, cq);
 169         mlx5_cq_put(cq);
 170         wait_for_completion(&cq->free);
 171
 172         return 0;
 173 }
 174 EXPORT_SYMBOL(mlx5_core_destroy_cq);
 175
 176 int mlx5_core_query_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
 177                        u32 *out)
 178 {
 179         u32 in[MLX5_ST_SZ_DW(query_cq_in)] = {};
 180
 181         MLX5_SET(query_cq_in, in, opcode, MLX5_CMD_OP_QUERY_CQ);
 182         MLX5_SET(query_cq_in, in, cqn, cq->cqn);
 183         return mlx5_cmd_exec_inout(dev, query_cq, in, out);
 184 }
 185 EXPORT_SYMBOL(mlx5_core_query_cq);
 186
 187 int mlx5_core_modify_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
 188                         u32 *in, int inlen)
 189 {
 190         u32 out[MLX5_ST_SZ_DW(modify_cq_out)] = {};
 191
 192         MLX5_SET(modify_cq_in, in, opcode, MLX5_CMD_OP_MODIFY_CQ);
 193         MLX5_SET(modify_cq_in, in, uid, cq->uid);
 194         return mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
 195 }
 196 EXPORT_SYMBOL(mlx5_core_modify_cq);
 197
 198 int mlx5_core_modify_cq_moderation(struct mlx5_core_dev *dev,
 199                                    struct mlx5_core_cq *cq,
 200                                    u16 cq_period,
 201                                    u16 cq_max_count)
 202 {
 203         u32 in[MLX5_ST_SZ_DW(modify_cq_in)] = {};
 204         void *cqc;
 205
 206         MLX5_SET(modify_cq_in, in, cqn, cq->cqn);
 207         cqc = MLX5_ADDR_OF(modify_cq_in, in, cq_context);
 208         MLX5_SET(cqc, cqc, cq_period, cq_period);
 209         MLX5_SET(cqc, cqc, cq_max_count, cq_max_count);
 210         MLX5_SET(modify_cq_in, in,
 211                  modify_field_select_resize_field_select.modify_field_select.modify_field_select,
 212                  MLX5_CQ_MODIFY_PERIOD | MLX5_CQ_MODIFY_COUNT);
 213
 214         return mlx5_core_modify_cq(dev, cq, in, sizeof(in));
 215 }
 216 EXPORT_SYMBOL(mlx5_core_modify_cq_moderation);