Subject: [net-next 09/15] net/mlx5: Enable management PF initialization

From: Saeed Mahameed <[email-masked]>
Date: Tue, 10 Jan 2023 21:30:39 -0800

From: Shay Drory <[email-masked]>

Enable initialization of DPU Management PF, which is a new loopback PF
designed for communication with BMC.
For now Management PF doesn't support nor require most upper layer
protocols so avoid them.

Signed-off-by: Shay Drory <[email-masked]>
Reviewed-by: Eran Ben Elisha <[email-masked]>
Reviewed-by: Moshe Shemesh <[email-masked]>
Signed-off-by: Saeed Mahameed <[email-masked]>
---
 drivers/net/ethernet/mellanox/mlx5/core/dev.c     | 6 ++++++
 drivers/net/ethernet/mellanox/mlx5/core/ecpf.c    | 8 ++++++++
 drivers/net/ethernet/mellanox/mlx5/core/eswitch.c | 2 +-
 include/linux/mlx5/driver.h                       | 5 +++++
 4 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/dev.c b/drivers/net/ethernet/mellanox/mlx5/core/dev.c
index 0571e40c6ee5..5b6b0b126e52 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/dev.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/dev.c
@@ -59,6 +59,9 @@ bool mlx5_eth_supported(struct mlx5_core_dev *dev)
 	if (!IS_ENABLED(CONFIG_MLX5_CORE_EN))
 		return false;
 
+	if (mlx5_core_is_management_pf(dev))
+		return false;
+
 	if (MLX5_CAP_GEN(dev, port_type) != MLX5_CAP_PORT_TYPE_ETH)
 		return false;
 
@@ -198,6 +201,9 @@ bool mlx5_rdma_supported(struct mlx5_core_dev *dev)
 	if (!IS_ENABLED(CONFIG_MLX5_INFINIBAND))
 		return false;
 
+	if (mlx5_core_is_management_pf(dev))
+		return false;
+
 	if (dev->priv.flags & MLX5_PRIV_FLAGS_DISABLE_IB_ADEV)
 		return false;
 
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/ecpf.c b/drivers/net/ethernet/mellanox/mlx5/core/ecpf.c
index 464eb3a18450..b70e36025d92 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/ecpf.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/ecpf.c
@@ -75,6 +75,10 @@ int mlx5_ec_init(struct mlx5_core_dev *dev)
 	if (!mlx5_core_is_ecpf(dev))
 		return 0;
 
+	/* Management PF don't have a peer PF */
+	if (mlx5_core_is_management_pf(dev))
+		return 0;
+
 	return mlx5_host_pf_init(dev);
 }
 
@@ -85,6 +89,10 @@ void mlx5_ec_cleanup(struct mlx5_core_dev *dev)
 	if (!mlx5_core_is_ecpf(dev))
 		return;
 
+	/* Management PF don't have a peer PF */
+	if (mlx5_core_is_management_pf(dev))
+		return;
+
 	mlx5_host_pf_cleanup(dev);
 
 	err = mlx5_wait_for_pages(dev, &dev->priv.host_pf_pages);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
index 0dfd5742c6fe..bbb6dab3b21f 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
@@ -1488,7 +1488,7 @@ int mlx5_esw_sf_max_hpf_functions(struct mlx5_core_dev *dev, u16 *max_sfs, u16 *
 	void *hca_caps;
 	int err;
 
-	if (!mlx5_core_is_ecpf(dev)) {
+	if (!mlx5_core_is_ecpf(dev) || mlx5_core_is_management_pf(dev)) {
 		*max_sfs = 0;
 		return 0;
 	}
diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
index 0c4f6acf59ca..50a5780367fa 100644
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -1202,6 +1202,11 @@ static inline bool mlx5_core_is_vf(const struct mlx5_core_dev *dev)
 	return dev->coredev_type == MLX5_COREDEV_VF;
 }
 
+static inline bool mlx5_core_is_management_pf(const struct mlx5_core_dev *dev)
+{
+	return MLX5_CAP_GEN(dev, num_ports) == 1 && !MLX5_CAP_GEN(dev, native_port_num);
+}
+
 static inline bool mlx5_core_is_ecpf(const struct mlx5_core_dev *dev)
 {
 	return dev->caps.embedded_cpu;
-- 
2.39.0