netdev - [PATCH net-next V2 10/11] net/mlx5: Skip pages EQ creation for non-page supplier function

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Date: Tue, 2 Apr 2024 16:30:42 +0300
From: Tariq Toukan <tariqt@...dia.com>
To: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>
CC: <netdev@...r.kernel.org>, Saeed Mahameed <saeedm@...dia.com>, Gal Pressman
	<gal@...dia.com>, Leon Romanovsky <leonro@...dia.com>, Jianbo Liu
	<jianbol@...dia.com>, Parav Pandit <parav@...dia.com>, Moshe Shemesh
	<moshe@...dia.com>, Tariq Toukan <tariqt@...dia.com>
Subject: [PATCH net-next V2 10/11] net/mlx5: Skip pages EQ creation for non-page supplier function

From: Jianbo Liu <jianbol@...dia.com>

Page events are not issued by device on the function if
page_request_disable is set, so no need to create pages EQ.

Signed-off-by: Jianbo Liu <jianbol@...dia.com>
Reviewed-by: Parav Pandit <parav@...dia.com>
Reviewed-by: Moshe Shemesh <moshe@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/eq.c | 9 ++++++++-
 include/linux/mlx5/mlx5_ifc.h                | 4 +++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eq.c b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
index 40a6cb052a2d..5693986ae656 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
@@ -688,6 +688,12 @@ static int create_async_eqs(struct mlx5_core_dev *dev)
 	if (err)
 		goto err2;
 
+	/* Skip page eq creation when the device does not request for page requests */
+	if (MLX5_CAP_GEN(dev, page_request_disable)) {
+		mlx5_core_dbg(dev, "Skip page EQ creation\n");
+		return 0;
+	}
+
 	param = (struct mlx5_eq_param) {
 		.irq = table->ctrl_irq,
 		.nent = /* TODO: sriov max_vf + */ 1,
@@ -716,7 +722,8 @@ static void destroy_async_eqs(struct mlx5_core_dev *dev)
 {
 	struct mlx5_eq_table *table = dev->priv.eq_table;
 
-	cleanup_async_eq(dev, &table->pages_eq, "pages");
+	if (!MLX5_CAP_GEN(dev, page_request_disable))
+		cleanup_async_eq(dev, &table->pages_eq, "pages");
 	cleanup_async_eq(dev, &table->async_eq, "async");
 	mlx5_cmd_allowed_opcode(dev, MLX5_CMD_OP_DESTROY_EQ);
 	mlx5_cmd_use_polling(dev);
diff --git a/include/linux/mlx5/mlx5_ifc.h b/include/linux/mlx5/mlx5_ifc.h
index 40f6fa138e27..cc159d8563d1 100644
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/include/linux/mlx5/mlx5_ifc.h
@@ -1485,7 +1485,9 @@ enum {
 };
 
 struct mlx5_ifc_cmd_hca_cap_bits {
-	u8         reserved_at_0[0x10];
+	u8         reserved_at_0[0x6];
+	u8         page_request_disable[0x1];
+	u8         reserved_at_7[0x9];
 	u8         shared_object_to_user_object_allowed[0x1];
 	u8         reserved_at_13[0xe];
 	u8         vhca_resource_manager[0x1];
-- 
2.31.1