mlx5/core/cq.c

0001 /*
0002  * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
0003  *
0004  * This software is available to you under a choice of one of two
0005  * licenses.  You may choose to be licensed under the terms of the GNU
0006  * General Public License (GPL) Version 2, available from the file
0007  * COPYING in the main directory of this source tree, or the
0008  * OpenIB.org BSD license below:
0009  *
0010  *     Redistribution and use in source and binary forms, with or
0011  *     without modification, are permitted provided that the following
0012  *     conditions are met:
0013  *
0014  *      - Redistributions of source code must retain the above
0015  *        copyright notice, this list of conditions and the following
0016  *        disclaimer.
0017  *
0018  *      - Redistributions in binary form must reproduce the above
0019  *        copyright notice, this list of conditions and the following
0020  *        disclaimer in the documentation and/or other materials
0021  *        provided with the distribution.
0022  *
0023  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
0024  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
0025  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
0026  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
0027  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
0028  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
0029  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
0030  * SOFTWARE.
0031  */
0032
0033 #include <linux/kernel.h>
0034 #include <linux/hardirq.h>
0035 #include <linux/mlx5/driver.h>
0036 #include <rdma/ib_verbs.h>
0037 #include <linux/mlx5/cq.h>
0038 #include "mlx5_core.h"
0039 #include "lib/eq.h"
0040
0041 #define TASKLET_MAX_TIME 2
0042 #define TASKLET_MAX_TIME_JIFFIES msecs_to_jiffies(TASKLET_MAX_TIME)
0043
0044 void mlx5_cq_tasklet_cb(struct tasklet_struct *t)
0045 {
0046     unsigned long flags;
0047     unsigned long end = jiffies + TASKLET_MAX_TIME_JIFFIES;
0048     struct mlx5_eq_tasklet *ctx = from_tasklet(ctx, t, task);
0049     struct mlx5_core_cq *mcq;
0050     struct mlx5_core_cq *temp;
0051
0052     spin_lock_irqsave(&ctx->lock, flags);
0053     list_splice_tail_init(&ctx->list, &ctx->process_list);
0054     spin_unlock_irqrestore(&ctx->lock, flags);
0055
0056     list_for_each_entry_safe(mcq, temp, &ctx->process_list,
0057                  tasklet_ctx.list) {
0058         list_del_init(&mcq->tasklet_ctx.list);
0059         mcq->tasklet_ctx.comp(mcq, NULL);
0060         mlx5_cq_put(mcq);
0061         if (time_after(jiffies, end))
0062             break;
0063     }
0064
0065     if (!list_empty(&ctx->process_list))
0066         tasklet_schedule(&ctx->task);
0067 }
0068
0069 static void mlx5_add_cq_to_tasklet(struct mlx5_core_cq *cq,
0070                    struct mlx5_eqe *eqe)
0071 {
0072     unsigned long flags;
0073     struct mlx5_eq_tasklet *tasklet_ctx = cq->tasklet_ctx.priv;
0074
0075     spin_lock_irqsave(&tasklet_ctx->lock, flags);
0076     /* When migrating CQs between EQs will be implemented, please note
0077      * that you need to sync this point. It is possible that
0078      * while migrating a CQ, completions on the old EQs could
0079      * still arrive.
0080      */
0081     if (list_empty_careful(&cq->tasklet_ctx.list)) {
0082         mlx5_cq_hold(cq);
0083         list_add_tail(&cq->tasklet_ctx.list, &tasklet_ctx->list);
0084     }
0085     spin_unlock_irqrestore(&tasklet_ctx->lock, flags);
0086 }
0087
0088 /* Callers must verify outbox status in case of err */
0089 int mlx5_create_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
0090            u32 *in, int inlen, u32 *out, int outlen)
0091 {
0092     int eqn = MLX5_GET(cqc, MLX5_ADDR_OF(create_cq_in, in, cq_context),
0093                c_eqn_or_apu_element);
0094     u32 din[MLX5_ST_SZ_DW(destroy_cq_in)] = {};
0095     struct mlx5_eq_comp *eq;
0096     int err;
0097
0098     eq = mlx5_eqn2comp_eq(dev, eqn);
0099     if (IS_ERR(eq))
0100         return PTR_ERR(eq);
0101
0102     memset(out, 0, outlen);
0103     MLX5_SET(create_cq_in, in, opcode, MLX5_CMD_OP_CREATE_CQ);
0104     err = mlx5_cmd_do(dev, in, inlen, out, outlen);
0105     if (err)
0106         return err;
0107
0108     cq->cqn = MLX5_GET(create_cq_out, out, cqn);
0109     cq->cons_index = 0;
0110     cq->arm_sn     = 0;
0111     cq->eq         = eq;
0112     cq->uid = MLX5_GET(create_cq_in, in, uid);
0113     refcount_set(&cq->refcount, 1);
0114     init_completion(&cq->free);
0115     if (!cq->comp)
0116         cq->comp = mlx5_add_cq_to_tasklet;
0117     /* assuming CQ will be deleted before the EQ */
0118     cq->tasklet_ctx.priv = &eq->tasklet_ctx;
0119     INIT_LIST_HEAD(&cq->tasklet_ctx.list);
0120
0121     /* Add to comp EQ CQ tree to recv comp events */
0122     err = mlx5_eq_add_cq(&eq->core, cq);
0123     if (err)
0124         goto err_cmd;
0125
0126     /* Add to async EQ CQ tree to recv async events */
0127     err = mlx5_eq_add_cq(mlx5_get_async_eq(dev), cq);
0128     if (err)
0129         goto err_cq_add;
0130
0131     cq->pid = current->pid;
0132     err = mlx5_debug_cq_add(dev, cq);
0133     if (err)
0134         mlx5_core_dbg(dev, "failed adding CP 0x%x to debug file system\n",
0135                   cq->cqn);
0136
0137     cq->uar = dev->priv.uar;
0138     cq->irqn = eq->core.irqn;
0139
0140     return 0;
0141
0142 err_cq_add:
0143     mlx5_eq_del_cq(&eq->core, cq);
0144 err_cmd:
0145     MLX5_SET(destroy_cq_in, din, opcode, MLX5_CMD_OP_DESTROY_CQ);
0146     MLX5_SET(destroy_cq_in, din, cqn, cq->cqn);
0147     MLX5_SET(destroy_cq_in, din, uid, cq->uid);
0148     mlx5_cmd_exec_in(dev, destroy_cq, din);
0149     return err;
0150 }
0151 EXPORT_SYMBOL(mlx5_create_cq);
0152
0153 /* oubox is checked and err val is normalized */
0154 int mlx5_core_create_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
0155             u32 *in, int inlen, u32 *out, int outlen)
0156 {
0157     int err = mlx5_create_cq(dev, cq, in, inlen, out, outlen);
0158
0159     return mlx5_cmd_check(dev, err, in, out);
0160 }
0161 EXPORT_SYMBOL(mlx5_core_create_cq);
0162
0163 int mlx5_core_destroy_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq)
0164 {
0165     u32 in[MLX5_ST_SZ_DW(destroy_cq_in)] = {};
0166     int err;
0167
0168     mlx5_debug_cq_remove(dev, cq);
0169
0170     mlx5_eq_del_cq(mlx5_get_async_eq(dev), cq);
0171     mlx5_eq_del_cq(&cq->eq->core, cq);
0172
0173     MLX5_SET(destroy_cq_in, in, opcode, MLX5_CMD_OP_DESTROY_CQ);
0174     MLX5_SET(destroy_cq_in, in, cqn, cq->cqn);
0175     MLX5_SET(destroy_cq_in, in, uid, cq->uid);
0176     err = mlx5_cmd_exec_in(dev, destroy_cq, in);
0177     if (err)
0178         return err;
0179
0180     synchronize_irq(cq->irqn);
0181     mlx5_cq_put(cq);
0182     wait_for_completion(&cq->free);
0183
0184     return 0;
0185 }
0186 EXPORT_SYMBOL(mlx5_core_destroy_cq);
0187
0188 int mlx5_core_query_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
0189                u32 *out)
0190 {
0191     u32 in[MLX5_ST_SZ_DW(query_cq_in)] = {};
0192
0193     MLX5_SET(query_cq_in, in, opcode, MLX5_CMD_OP_QUERY_CQ);
0194     MLX5_SET(query_cq_in, in, cqn, cq->cqn);
0195     return mlx5_cmd_exec_inout(dev, query_cq, in, out);
0196 }
0197 EXPORT_SYMBOL(mlx5_core_query_cq);
0198
0199 int mlx5_core_modify_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
0200             u32 *in, int inlen)
0201 {
0202     u32 out[MLX5_ST_SZ_DW(modify_cq_out)] = {};
0203
0204     MLX5_SET(modify_cq_in, in, opcode, MLX5_CMD_OP_MODIFY_CQ);
0205     MLX5_SET(modify_cq_in, in, uid, cq->uid);
0206     return mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
0207 }
0208 EXPORT_SYMBOL(mlx5_core_modify_cq);
0209
0210 int mlx5_core_modify_cq_moderation(struct mlx5_core_dev *dev,
0211                    struct mlx5_core_cq *cq,
0212                    u16 cq_period,
0213                    u16 cq_max_count)
0214 {
0215     u32 in[MLX5_ST_SZ_DW(modify_cq_in)] = {};
0216     void *cqc;
0217
0218     MLX5_SET(modify_cq_in, in, cqn, cq->cqn);
0219     cqc = MLX5_ADDR_OF(modify_cq_in, in, cq_context);
0220     MLX5_SET(cqc, cqc, cq_period, cq_period);
0221     MLX5_SET(cqc, cqc, cq_max_count, cq_max_count);
0222     MLX5_SET(modify_cq_in, in,
0223          modify_field_select_resize_field_select.modify_field_select.modify_field_select,
0224          MLX5_CQ_MODIFY_PERIOD | MLX5_CQ_MODIFY_COUNT);
0225
0226     return mlx5_core_modify_cq(dev, cq, in, sizeof(in));
0227 }
0228 EXPORT_SYMBOL(mlx5_core_modify_cq_moderation);