From: Mark Bloch Date: Thu, 23 Oct 2025 09:17:00 +0000 (+0300) Subject: net/mlx5: Add balance ID support for LAG multiplane groups X-Git-Tag: v6.19-rc1~170^2~299^2 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=20d78ead947783b039b02ca4b8c551b4d1894759;p=thirdparty%2Fkernel%2Flinux.git net/mlx5: Add balance ID support for LAG multiplane groups Implement balance ID support for multiplane LAG configurations. This feature enables per-multiplane group load balancing by extending the software system image GUID with a balance ID component. Key implementations: - Enable lag_per_mp_group capability when supported by hardware. - Append load_balance_id to software system image GUID when conditions are met. - Increase MLX5_SW_IMAGE_GUID_MAX_BYTES from 8 to 9 to accommodate the extra byte. The balance ID is appended to the system image GUID only when both load_balance_id and lag_per_mp_group capabilities are available, ensuring backward compatibility while enabling enhanced LAG functionality. This enhancement allows for more granular load balancing control in complex multi-plane LAG deployments, improving network performance and flexibility. Signed-off-by: Mark Bloch Reviewed-by: Moshe Shemesh Reviewed-by: Shay Drori Signed-off-by: Tariq Toukan Link: https://patch.msgid.link/1761211020-925651-6-git-send-email-tariqt@nvidia.com Signed-off-by: Paolo Abeni --- diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c index 563267acf386f..c904696cbc3a1 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/main.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c @@ -575,6 +575,11 @@ static int handle_hca_cap_2(struct mlx5_core_dev *dev, void *set_ctx) do_set = true; } + if (MLX5_CAP_GEN_2_MAX(dev, lag_per_mp_group)) { + MLX5_SET(cmd_hca_cap_2, set_hca_cap, lag_per_mp_group, 1); + do_set = true; + } + /* some FW versions that support querying MLX5_CAP_GENERAL_2 * capabilities but don't support setting them. * Skip unnecessary update to hca_cap_2 when no changes were introduced diff --git a/drivers/net/ethernet/mellanox/mlx5/core/vport.c b/drivers/net/ethernet/mellanox/mlx5/core/vport.c index 4224e27508654..992873536c1b1 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/vport.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/vport.c @@ -1203,6 +1203,10 @@ void mlx5_query_nic_sw_system_image_guid(struct mlx5_core_dev *mdev, u8 *buf, memcpy(buf, &fw_system_image_guid, sizeof(fw_system_image_guid)); *len += sizeof(fw_system_image_guid); + + if (MLX5_CAP_GEN_2(mdev, load_balance_id) && + MLX5_CAP_GEN_2(mdev, lag_per_mp_group)) + buf[(*len)++] = MLX5_CAP_GEN_2(mdev, load_balance_id); } static bool mlx5_vport_use_vhca_id_as_func_id(struct mlx5_core_dev *dev, diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h index dcf262aa9ea6b..046396269ccf6 100644 --- a/include/linux/mlx5/driver.h +++ b/include/linux/mlx5/driver.h @@ -1380,6 +1380,6 @@ static inline struct net *mlx5_core_net(struct mlx5_core_dev *dev) return devlink_net(priv_to_devlink(dev)); } -#define MLX5_SW_IMAGE_GUID_MAX_BYTES 8 +#define MLX5_SW_IMAGE_GUID_MAX_BYTES 9 #endif /* MLX5_DRIVER_H */