From: Shay Drory <shayd@nvidia.com>
Date: Thu, 19 Aug 2021 16:18:57 +0300
Subject: net/mlx5: Shift control IRQ to the last index
Patch-mainline: v5.16-rc1
Git-commit: 3663ad34bc707fc85492f4d83a313f5df84718d4
References: jsc#SLE-19253

Control IRQ is the first IRQ vector. This complicates handling of
completion irqs as we need to offset them by one.
in the next patch, there are scenarios where completion and control EQs
will share the same irq. for example: functions with single IRQ. To ease
such scenarios, we shift control IRQ to the end of the irq array.

Signed-off-by: Shay Drory <shayd@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/hw/mlx5/odp.c                   |    1 +
 drivers/net/ethernet/mellanox/mlx5/core/eq.c       |    9 +++++----
 drivers/net/ethernet/mellanox/mlx5/core/mlx5_irq.h |    2 --
 drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c  |   10 +++++-----
 include/linux/mlx5/driver.h                        |    2 ++
 5 files changed, 13 insertions(+), 11 deletions(-)

--- a/drivers/infiniband/hw/mlx5/odp.c
+++ b/drivers/infiniband/hw/mlx5/odp.c
@@ -1559,6 +1559,7 @@ int mlx5r_odp_create_eq(struct mlx5_ib_d
 
 	eq->irq_nb.notifier_call = mlx5_ib_eq_pf_int;
 	param = (struct mlx5_eq_param) {
+		.irq_index = MLX5_IRQ_EQ_CTRL,
 		.nent = MLX5_IB_NUM_PF_EQE,
 	};
 	param.mask[0] = 1ull << MLX5_EVENT_TYPE_PAGE_FAULT;
--- a/drivers/net/ethernet/mellanox/mlx5/core/eq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
@@ -632,6 +632,7 @@ static int create_async_eqs(struct mlx5_
 	mlx5_eq_notifier_register(dev, &table->cq_err_nb);
 
 	param = (struct mlx5_eq_param) {
+		.irq_index = MLX5_IRQ_EQ_CTRL,
 		.nent = MLX5_NUM_CMD_EQE,
 		.mask[0] = 1ull << MLX5_EVENT_TYPE_CMD,
 	};
@@ -644,6 +645,7 @@ static int create_async_eqs(struct mlx5_
 	mlx5_cmd_allowed_opcode(dev, CMD_ALLOWED_OPCODE_ALL);
 
 	param = (struct mlx5_eq_param) {
+		.irq_index = MLX5_IRQ_EQ_CTRL,
 		.nent = MLX5_NUM_ASYNC_EQE,
 	};
 
@@ -653,6 +655,7 @@ static int create_async_eqs(struct mlx5_
 		goto err2;
 
 	param = (struct mlx5_eq_param) {
+		.irq_index = MLX5_IRQ_EQ_CTRL,
 		.nent = /* TODO: sriov max_vf + */ 1,
 		.mask[0] = 1ull << MLX5_EVENT_TYPE_PAGE_REQUEST,
 	};
@@ -806,8 +809,8 @@ static int create_comp_eqs(struct mlx5_c
 	ncomp_eqs = table->num_comp_eqs;
 	nent = MLX5_COMP_EQ_SIZE;
 	for (i = 0; i < ncomp_eqs; i++) {
-		int vecidx = i + MLX5_IRQ_VEC_COMP_BASE;
 		struct mlx5_eq_param param = {};
+		int vecidx = i;
 
 		eq = kzalloc(sizeof(*eq), GFP_KERNEL);
 		if (!eq) {
@@ -953,9 +956,7 @@ static int set_rmap(struct mlx5_core_dev
 		goto err_out;
 	}
 
-	vecidx = MLX5_IRQ_VEC_COMP_BASE;
-	for (; vecidx < eq_table->num_comp_eqs + MLX5_IRQ_VEC_COMP_BASE;
-	     vecidx++) {
+	for (vecidx = 0; vecidx < eq_table->num_comp_eqs; vecidx++) {
 		err = irq_cpu_rmap_add(eq_table->rmap,
 				       pci_irq_vector(mdev->pdev, vecidx));
 		if (err) {
--- a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_irq.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_irq.h
@@ -8,8 +8,6 @@
 
 #define MLX5_COMP_EQS_PER_SF 8
 
-#define MLX5_IRQ_EQ_CTRL (0)
-
 struct mlx5_irq;
 
 int mlx5_irq_table_init(struct mlx5_core_dev *dev);
--- a/drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c
@@ -194,15 +194,14 @@ static void irq_sf_set_name(struct mlx5_
 	snprintf(name, MLX5_MAX_IRQ_NAME, "%s%d", pool->name, vecidx);
 }
 
-static void irq_set_name(char *name, int vecidx)
+static void irq_set_name(struct mlx5_irq_pool *pool, char *name, int vecidx)
 {
-	if (vecidx == 0) {
+	if (vecidx == pool->xa_num_irqs.max) {
 		snprintf(name, MLX5_MAX_IRQ_NAME, "mlx5_async%d", vecidx);
 		return;
 	}
 
-	snprintf(name, MLX5_MAX_IRQ_NAME, "mlx5_comp%d",
-		 vecidx - MLX5_IRQ_VEC_COMP_BASE);
+	snprintf(name, MLX5_MAX_IRQ_NAME, "mlx5_comp%d", vecidx);
 }
 
 static struct mlx5_irq *irq_request(struct mlx5_irq_pool *pool, int i)
@@ -217,7 +216,7 @@ static struct mlx5_irq *irq_request(stru
 		return ERR_PTR(-ENOMEM);
 	irq->irqn = pci_irq_vector(dev->pdev, i);
 	if (!pool->name[0])
-		irq_set_name(name, i);
+		irq_set_name(pool, name, i);
 	else
 		irq_sf_set_name(pool, name, i);
 	ATOMIC_INIT_NOTIFIER_HEAD(&irq->nh);
@@ -440,6 +439,7 @@ struct mlx5_irq *mlx5_irq_request(struct
 	}
 pf_irq:
 	pool = irq_table->pf_pool;
+	vecidx = (vecidx == MLX5_IRQ_EQ_CTRL) ? pool->xa_num_irqs.max : vecidx;
 	irq = irq_pool_request_vector(pool, vecidx, affinity);
 out:
 	if (IS_ERR(irq))
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -59,6 +59,8 @@
 
 #define MLX5_ADEV_NAME "mlx5_core"
 
+#define MLX5_IRQ_EQ_CTRL (U8_MAX)
+
 enum {
 	MLX5_BOARD_ID_LEN = 64,
 };