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

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This source file includes following definitions.
mlx5_cq_tasklet_cb
mlx5_add_cq_to_tasklet
mlx5_core_create_cq
mlx5_core_destroy_cq
mlx5_core_query_cq
mlx5_core_modify_cq
mlx5_core_modify_cq_moderation
   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 <linux/mlx5/cmd.h>
  38 #include <rdma/ib_verbs.h>
  39 #include <linux/mlx5/cq.h>
  40 #include "mlx5_core.h"
  41 #include "lib/eq.h"
  42 
  43 #define TASKLET_MAX_TIME 2
  44 #define TASKLET_MAX_TIME_JIFFIES msecs_to_jiffies(TASKLET_MAX_TIME)
  45 
  46 void mlx5_cq_tasklet_cb(unsigned long data)
  47 {
  48         unsigned long flags;
  49         unsigned long end = jiffies + TASKLET_MAX_TIME_JIFFIES;
  50         struct mlx5_eq_tasklet *ctx = (struct mlx5_eq_tasklet *)data;
  51         struct mlx5_core_cq *mcq;
  52         struct mlx5_core_cq *temp;
  53 
  54         spin_lock_irqsave(&ctx->lock, flags);
  55         list_splice_tail_init(&ctx->list, &ctx->process_list);
  56         spin_unlock_irqrestore(&ctx->lock, flags);
  57 
  58         list_for_each_entry_safe(mcq, temp, &ctx->process_list,
  59                                  tasklet_ctx.list) {
  60                 list_del_init(&mcq->tasklet_ctx.list);
  61                 mcq->tasklet_ctx.comp(mcq, NULL);
  62                 mlx5_cq_put(mcq);
  63                 if (time_after(jiffies, end))
  64                         break;
  65         }
  66 
  67         if (!list_empty(&ctx->process_list))
  68                 tasklet_schedule(&ctx->task);
  69 }
  70 
  71 static void mlx5_add_cq_to_tasklet(struct mlx5_core_cq *cq,
  72                                    struct mlx5_eqe *eqe)
  73 {
  74         unsigned long flags;
  75         struct mlx5_eq_tasklet *tasklet_ctx = cq->tasklet_ctx.priv;
  76 
  77         spin_lock_irqsave(&tasklet_ctx->lock, flags);
  78         /* When migrating CQs between EQs will be implemented, please note
  79          * that you need to sync this point. It is possible that
  80          * while migrating a CQ, completions on the old EQs could
  81          * still arrive.
  82          */
  83         if (list_empty_careful(&cq->tasklet_ctx.list)) {
  84                 mlx5_cq_hold(cq);
  85                 list_add_tail(&cq->tasklet_ctx.list, &tasklet_ctx->list);
  86         }
  87         spin_unlock_irqrestore(&tasklet_ctx->lock, flags);
  88 }
  89 
  90 int mlx5_core_create_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
  91                         u32 *in, int inlen, u32 *out, int outlen)
  92 {
  93         int eqn = MLX5_GET(cqc, MLX5_ADDR_OF(create_cq_in, in, cq_context), c_eqn);
  94         u32 dout[MLX5_ST_SZ_DW(destroy_cq_out)];
  95         u32 din[MLX5_ST_SZ_DW(destroy_cq_in)];
  96         struct mlx5_eq_comp *eq;
  97         int err;
  98 
  99         eq = mlx5_eqn2comp_eq(dev, eqn);
 100         if (IS_ERR(eq))
 101                 return PTR_ERR(eq);
 102 
 103         memset(out, 0, outlen);
 104         MLX5_SET(create_cq_in, in, opcode, MLX5_CMD_OP_CREATE_CQ);
 105         err = mlx5_cmd_exec(dev, in, inlen, out, outlen);
 106         if (err)
 107                 return err;
 108 
 109         cq->cqn = MLX5_GET(create_cq_out, out, cqn);
 110         cq->cons_index = 0;
 111         cq->arm_sn     = 0;
 112         cq->eq         = eq;
 113         cq->uid = MLX5_GET(create_cq_in, in, uid);
 114         refcount_set(&cq->refcount, 1);
 115         init_completion(&cq->free);
 116         if (!cq->comp)
 117                 cq->comp = mlx5_add_cq_to_tasklet;
 118         /* assuming CQ will be deleted before the EQ */
 119         cq->tasklet_ctx.priv = &eq->tasklet_ctx;
 120         INIT_LIST_HEAD(&cq->tasklet_ctx.list);
 121 
 122         /* Add to comp EQ CQ tree to recv comp events */
 123         err = mlx5_eq_add_cq(&eq->core, cq);
 124         if (err)
 125                 goto err_cmd;
 126 
 127         /* Add to async EQ CQ tree to recv async events */
 128         err = mlx5_eq_add_cq(mlx5_get_async_eq(dev), cq);
 129         if (err)
 130                 goto err_cq_add;
 131 
 132         cq->pid = current->pid;
 133         err = mlx5_debug_cq_add(dev, cq);
 134         if (err)
 135                 mlx5_core_dbg(dev, "failed adding CP 0x%x to debug file system\n",
 136                               cq->cqn);
 137 
 138         cq->uar = dev->priv.uar;
 139 
 140         return 0;
 141 
 142 err_cq_add:
 143         mlx5_eq_del_cq(&eq->core, cq);
 144 err_cmd:
 145         memset(din, 0, sizeof(din));
 146         memset(dout, 0, sizeof(dout));
 147         MLX5_SET(destroy_cq_in, din, opcode, MLX5_CMD_OP_DESTROY_CQ);
 148         MLX5_SET(destroy_cq_in, din, cqn, cq->cqn);
 149         MLX5_SET(destroy_cq_in, din, uid, cq->uid);
 150         mlx5_cmd_exec(dev, din, sizeof(din), dout, sizeof(dout));
 151         return err;
 152 }
 153 EXPORT_SYMBOL(mlx5_core_create_cq);
 154 
 155 int mlx5_core_destroy_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq)
 156 {
 157         u32 out[MLX5_ST_SZ_DW(destroy_cq_out)] = {0};
 158         u32 in[MLX5_ST_SZ_DW(destroy_cq_in)] = {0};
 159         int err;
 160 
 161         mlx5_eq_del_cq(mlx5_get_async_eq(dev), cq);
 162         mlx5_eq_del_cq(&cq->eq->core, cq);
 163 
 164         MLX5_SET(destroy_cq_in, in, opcode, MLX5_CMD_OP_DESTROY_CQ);
 165         MLX5_SET(destroy_cq_in, in, cqn, cq->cqn);
 166         MLX5_SET(destroy_cq_in, in, uid, cq->uid);
 167         err = mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
 168         if (err)
 169                 return err;
 170 
 171         synchronize_irq(cq->irqn);
 172 
 173         mlx5_debug_cq_remove(dev, cq);
 174         mlx5_cq_put(cq);
 175         wait_for_completion(&cq->free);
 176 
 177         return 0;
 178 }
 179 EXPORT_SYMBOL(mlx5_core_destroy_cq);
 180 
 181 int mlx5_core_query_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
 182                        u32 *out, int outlen)
 183 {
 184         u32 in[MLX5_ST_SZ_DW(query_cq_in)] = {0};
 185 
 186         MLX5_SET(query_cq_in, in, opcode, MLX5_CMD_OP_QUERY_CQ);
 187         MLX5_SET(query_cq_in, in, cqn, cq->cqn);
 188         return mlx5_cmd_exec(dev, in, sizeof(in), out, outlen);
 189 }
 190 EXPORT_SYMBOL(mlx5_core_query_cq);
 191 
 192 int mlx5_core_modify_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
 193                         u32 *in, int inlen)
 194 {
 195         u32 out[MLX5_ST_SZ_DW(modify_cq_out)] = {0};
 196 
 197         MLX5_SET(modify_cq_in, in, opcode, MLX5_CMD_OP_MODIFY_CQ);
 198         MLX5_SET(modify_cq_in, in, uid, cq->uid);
 199         return mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
 200 }
 201 EXPORT_SYMBOL(mlx5_core_modify_cq);
 202 
 203 int mlx5_core_modify_cq_moderation(struct mlx5_core_dev *dev,
 204                                    struct mlx5_core_cq *cq,
 205                                    u16 cq_period,
 206                                    u16 cq_max_count)
 207 {
 208         u32 in[MLX5_ST_SZ_DW(modify_cq_in)] = {0};
 209         void *cqc;
 210 
 211         MLX5_SET(modify_cq_in, in, cqn, cq->cqn);
 212         cqc = MLX5_ADDR_OF(modify_cq_in, in, cq_context);
 213         MLX5_SET(cqc, cqc, cq_period, cq_period);
 214         MLX5_SET(cqc, cqc, cq_max_count, cq_max_count);
 215         MLX5_SET(modify_cq_in, in,
 216                  modify_field_select_resize_field_select.modify_field_select.modify_field_select,
 217                  MLX5_CQ_MODIFY_PERIOD | MLX5_CQ_MODIFY_COUNT);
 218 
 219         return mlx5_core_modify_cq(dev, cq, in, sizeof(in));
 220 }
 221 EXPORT_SYMBOL(mlx5_core_modify_cq_moderation);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/net/ethernet/mellanox/mlx5/core/cq.c

DEFINITIONS
