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net/mlx5: CQ hold/put API 

Now as the CQ table is per EQ, add an API to hold/put CQ to be used from
eq.c in downstream patch.

Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Reviewed-by: Gal Pressman <galp@mellanox.com>
This commit is contained in:
Saeed Mahameed 2018-02-01 03:32:00 -08:00
parent d5c07157dd
commit f105b45bf7
2 changed files with 30 additions and 23 deletions
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42
drivers/net/ethernet/mellanox/mlx5/core/cq.c
View File

@ -58,8 +58,7 @@ void mlx5_cq_tasklet_cb(unsigned long data)
tasklet_ctx.list) {
list_del_init(&mcq->tasklet_ctx.list);
mcq->tasklet_ctx.comp(mcq);
if (refcount_dec_and_test(&mcq->refcount))
complete(&mcq->free);
mlx5_cq_put(mcq);
if (time_after(jiffies, end))
break;
}
@ -80,23 +79,31 @@ static void mlx5_add_cq_to_tasklet(struct mlx5_core_cq *cq)
* still arrive.
*/
if (list_empty_careful(&cq->tasklet_ctx.list)) {
refcount_inc(&cq->refcount);
mlx5_cq_hold(cq);
list_add_tail(&cq->tasklet_ctx.list, &tasklet_ctx->list);
}
spin_unlock_irqrestore(&tasklet_ctx->lock, flags);
}
void mlx5_cq_completion(struct mlx5_eq *eq, u32 cqn)
/* caller must eventually call mlx5_cq_put on the returned cq */
static struct mlx5_core_cq *mlx5_eq_cq_get(struct mlx5_eq *eq, u32 cqn)
{
struct mlx5_cq_table *table = &eq->cq_table;
struct mlx5_core_cq *cq;
struct mlx5_core_cq *cq = NULL;
spin_lock(&table->lock);
cq = radix_tree_lookup(&table->tree, cqn);
if (likely(cq))
refcount_inc(&cq->refcount);
mlx5_cq_hold(cq);
spin_unlock(&table->lock);
return cq;
}
void mlx5_cq_completion(struct mlx5_eq *eq, u32 cqn)
{
struct mlx5_core_cq *cq = mlx5_eq_cq_get(eq, cqn);
if (unlikely(!cq)) {
mlx5_core_warn(eq->dev, "Completion event for bogus CQ 0x%x\n", cqn);
return;
@ -106,22 +113,12 @@ void mlx5_cq_completion(struct mlx5_eq *eq, u32 cqn)
cq->comp(cq);
if (refcount_dec_and_test(&cq->refcount))
complete(&cq->free);
mlx5_cq_put(cq);
}
void mlx5_cq_event(struct mlx5_eq *eq, u32 cqn, int event_type)
{
struct mlx5_cq_table *table = &eq->cq_table;
struct mlx5_core_cq *cq;
spin_lock(&table->lock);
cq = radix_tree_lookup(&table->tree, cqn);
if (likely(cq))
refcount_inc(&cq->refcount);
spin_unlock(&table->lock);
struct mlx5_core_cq *cq = mlx5_eq_cq_get(eq, cqn);
if (unlikely(!cq)) {
mlx5_core_warn(eq->dev, "Async event for bogus CQ 0x%x\n", cqn);
@ -130,8 +127,7 @@ void mlx5_cq_event(struct mlx5_eq *eq, u32 cqn, int event_type)
cq->event(cq, event_type);
if (refcount_dec_and_test(&cq->refcount))
complete(&cq->free);
mlx5_cq_put(cq);
}
int mlx5_core_create_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
@ -158,7 +154,8 @@ int mlx5_core_create_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
cq->cons_index = 0;
cq->arm_sn = 0;
cq->eq = eq;
refcount_set(&cq->refcount, 1);
refcount_set(&cq->refcount, 0);
mlx5_cq_hold(cq);
init_completion(&cq->free);
if (!cq->comp)
cq->comp = mlx5_add_cq_to_tasklet;
@ -221,8 +218,7 @@ int mlx5_core_destroy_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq)
synchronize_irq(cq->irqn);
mlx5_debug_cq_remove(dev, cq);
if (refcount_dec_and_test(&cq->refcount))
complete(&cq->free);
mlx5_cq_put(cq);
wait_for_completion(&cq->free);
return 0;

11
include/linux/mlx5/cq.h
View File

@ -172,6 +172,17 @@ static inline void mlx5_cq_arm(struct mlx5_core_cq *cq, u32 cmd,
mlx5_write64(doorbell, uar_page + MLX5_CQ_DOORBELL, NULL);
}
static inline void mlx5_cq_hold(struct mlx5_core_cq *cq)
{
refcount_inc(&cq->refcount);
}
static inline void mlx5_cq_put(struct mlx5_core_cq *cq)
{
if (refcount_dec_and_test(&cq->refcount))
complete(&cq->free);
}
int mlx5_core_create_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
u32 *in, int inlen);
int mlx5_core_destroy_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq);