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Commit f105b45b authored by Saeed Mahameed's avatar Saeed Mahameed
Browse files

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: default avatarSaeed Mahameed <saeedm@mellanox.com>
Reviewed-by: default avatarGal Pressman <galp@mellanox.com>
parent d5c07157

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

+19 −23
Original line number Diff line number Diff line
@@ -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;

include/linux/mlx5/cq.h

+11 −0
Original line number Diff line number Diff line
@@ -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);