net/mlx5_core: Identify resources by their type

This patch puts a common part as the first field of mlx5_core_qp. This field is
used to identify which resource generated an event. This is required since upcoming
new resource types such as DC targets are allocated for the same numerical space
as regular QPs and may generate the same events. By searching the resource in the
same table we can then look at the common field to identify the resource.

Signed-off-by: Eli Cohen <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

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

···
 	int eqes_found = 0;
 	int set_ci = 0;
 	u32 cqn;
-	u32 srqn;
+	u32 rsn;
 	u8 port;
 
 	while ((eqe = next_eqe_sw(eq))) {
···
 		case MLX5_EVENT_TYPE_PATH_MIG_FAILED:
 		case MLX5_EVENT_TYPE_WQ_INVAL_REQ_ERROR:
 		case MLX5_EVENT_TYPE_WQ_ACCESS_ERROR:
+			rsn = be32_to_cpu(eqe->data.qp_srq.qp_srq_n) & 0xffffff;
 			mlx5_core_dbg(dev, "event %s(%d) arrived\n",
 				      eqe_type_str(eqe->type), eqe->type);
-			mlx5_qp_event(dev, be32_to_cpu(eqe->data.qp_srq.qp_srq_n) & 0xffffff,
-				      eqe->type);
+			mlx5_rsc_event(dev, rsn, eqe->type);
 			break;
 
 		case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT:
 		case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR:
-			srqn = be32_to_cpu(eqe->data.qp_srq.qp_srq_n) & 0xffffff;
+			rsn = be32_to_cpu(eqe->data.qp_srq.qp_srq_n) & 0xffffff;
 			mlx5_core_dbg(dev, "SRQ event %s(%d): srqn 0x%x\n",
-				      eqe_type_str(eqe->type), eqe->type, srqn);
-			mlx5_srq_event(dev, srqn, eqe->type);
+				      eqe_type_str(eqe->type), eqe->type, rsn);
+			mlx5_srq_event(dev, rsn, eqe->type);
 			break;
 
 		case MLX5_EVENT_TYPE_CMD:

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

···
 
 #include "mlx5_core.h"
 
-void mlx5_qp_event(struct mlx5_core_dev *dev, u32 qpn, int event_type)
+static struct mlx5_core_rsc_common *mlx5_get_rsc(struct mlx5_core_dev *dev,
+						 u32 rsn)
 {
 	struct mlx5_qp_table *table = &dev->priv.qp_table;
-	struct mlx5_core_qp *qp;
+	struct mlx5_core_rsc_common *common;
 
 	spin_lock(&table->lock);
 
-	qp = radix_tree_lookup(&table->tree, qpn);
-	if (qp)
-		atomic_inc(&qp->refcount);
+	common = radix_tree_lookup(&table->tree, rsn);
+	if (common)
+		atomic_inc(&common->refcount);
 
 	spin_unlock(&table->lock);
 
-	if (!qp) {
-		mlx5_core_warn(dev, "Async event for bogus QP 0x%x\n", qpn);
+	if (!common) {
+		mlx5_core_warn(dev, "Async event for bogus resource 0x%x\n",
+			       rsn);
+		return NULL;
+	}
+	return common;
+}
+
+void mlx5_core_put_rsc(struct mlx5_core_rsc_common *common)
+{
+	if (atomic_dec_and_test(&common->refcount))
+		complete(&common->free);
+}
+
+void mlx5_rsc_event(struct mlx5_core_dev *dev, u32 rsn, int event_type)
+{
+	struct mlx5_core_rsc_common *common = mlx5_get_rsc(dev, rsn);
+	struct mlx5_core_qp *qp;
+
+	if (!common)
 		return;
+
+	switch (common->res) {
+	case MLX5_RES_QP:
+		qp = (struct mlx5_core_qp *)common;
+		qp->event(qp, event_type);
+		break;
+
+	default:
+		mlx5_core_warn(dev, "invalid resource type for 0x%x\n", rsn);
 	}
 
-	qp->event(qp, event_type);
-
-	if (atomic_dec_and_test(&qp->refcount))
-		complete(&qp->free);
+	mlx5_core_put_rsc(common);
 }
 
 int mlx5_core_create_qp(struct mlx5_core_dev *dev,
···
 	qp->qpn = be32_to_cpu(out.qpn) & 0xffffff;
 	mlx5_core_dbg(dev, "qpn = 0x%x\n", qp->qpn);
 
+	qp->common.res = MLX5_RES_QP;
 	spin_lock_irq(&table->lock);
 	err = radix_tree_insert(&table->tree, qp->qpn, qp);
 	spin_unlock_irq(&table->lock);
···
 			      qp->qpn);
 
 	qp->pid = current->pid;
-	atomic_set(&qp->refcount, 1);
+	atomic_set(&qp->common.refcount, 1);
 	atomic_inc(&dev->num_qps);
-	init_completion(&qp->free);
+	init_completion(&qp->common.free);
 
 	return 0;
 
···
 	radix_tree_delete(&table->tree, qp->qpn);
 	spin_unlock_irqrestore(&table->lock, flags);
 
-	if (atomic_dec_and_test(&qp->refcount))
-		complete(&qp->free);
-	wait_for_completion(&qp->free);
+	mlx5_core_put_rsc((struct mlx5_core_rsc_common *)qp);
+	wait_for_completion(&qp->common.free);
 
 	memset(&in, 0, sizeof(in));
 	memset(&out, 0, sizeof(out));

include/linux/mlx5/driver.h

···
 	u32			pd;
 };
 
+enum mlx5_res_type {
+	MLX5_RES_QP,
+};
+
+struct mlx5_core_rsc_common {
+	enum mlx5_res_type	res;
+	atomic_t		refcount;
+	struct completion	free;
+};
+
 struct mlx5_core_srq {
 	u32		srqn;
 	int		max;
···
 void mlx5_eq_cleanup(struct mlx5_core_dev *dev);
 void mlx5_fill_page_array(struct mlx5_buf *buf, __be64 *pas);
 void mlx5_cq_completion(struct mlx5_core_dev *dev, u32 cqn);
-void mlx5_qp_event(struct mlx5_core_dev *dev, u32 qpn, int event_type);
+void mlx5_rsc_event(struct mlx5_core_dev *dev, u32 rsn, int event_type);
 void mlx5_srq_event(struct mlx5_core_dev *dev, u32 srqn, int event_type);
 struct mlx5_core_srq *mlx5_core_get_srq(struct mlx5_core_dev *dev, u32 srqn);
 void mlx5_cmd_comp_handler(struct mlx5_core_dev *dev, unsigned long vector);
···
 int mlx5_core_create_psv(struct mlx5_core_dev *dev, u32 pdn,
 			 int npsvs, u32 *sig_index);
 int mlx5_core_destroy_psv(struct mlx5_core_dev *dev, int psv_num);
+void mlx5_core_put_rsc(struct mlx5_core_rsc_common *common);
 
 static inline u32 mlx5_mkey_to_idx(u32 mkey)
 {

include/linux/mlx5/qp.h

···
 };
 
 struct mlx5_core_qp {
+	struct mlx5_core_rsc_common	common; /* must be first */
 	void (*event)		(struct mlx5_core_qp *, int);
 	int			qpn;
-	atomic_t		refcount;
-	struct completion	free;
 	struct mlx5_rsc_debug	*dbg;
 	int			pid;
 };