net/mlx5: SHAMPO: Introduce new SHAMPO specific HCA caps

Read and cache SHAMPO specific caps for header data split capabilities.
Will be used in downstream patch.

Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20250109204231.1809851-4-tariqt@nvidia.com
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>

Author: Saeed Mahameed

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

@@ -281,6 +281,12 @@ int mlx5_query_hca_caps(struct mlx5_core_dev *dev)
 			return err;
 	}
 
+	if (MLX5_CAP_GEN(dev, shampo)) {
+		err = mlx5_core_get_caps_mode(dev, MLX5_CAP_SHAMPO, HCA_CAP_OPMOD_GET_CUR);
+		if (err)
+			return err;
+	}
+
 	return 0;
 }
 

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

@@ -368,6 +368,10 @@ int mlx5_core_get_caps_mode(struct mlx5_core_dev *dev, enum mlx5_cap_type cap_ty
 	u16 opmod = (cap_type << 1) | (cap_mode & 0x01);
 	int err;
 
+	if (WARN_ON(!dev->caps.hca[cap_type]))
+		/* this cap_type must be added to mlx5_hca_caps_alloc() */
+		return -EINVAL;
+
 	memset(in, 0, sizeof(in));
 	out = kzalloc(out_sz, GFP_KERNEL);
 	if (!out)
@@ -1788,6 +1792,7 @@ static const int types[] = {
 	MLX5_CAP_MACSEC,
 	MLX5_CAP_ADV_VIRTUALIZATION,
 	MLX5_CAP_CRYPTO,
+	MLX5_CAP_SHAMPO,
 };
 
 static void mlx5_hca_caps_free(struct mlx5_core_dev *dev)

include/linux/mlx5/device.h

@@ -1245,6 +1245,7 @@ enum mlx5_cap_type {
 	MLX5_CAP_DEV_EVENT = 0x14,
 	MLX5_CAP_IPSEC,
 	MLX5_CAP_CRYPTO = 0x1a,
+	MLX5_CAP_SHAMPO = 0x1d,
 	MLX5_CAP_MACSEC = 0x1f,
 	MLX5_CAP_GENERAL_2 = 0x20,
 	MLX5_CAP_PORT_SELECTION = 0x25,
@@ -1470,6 +1471,9 @@ enum mlx5_qcam_feature_groups {
 #define MLX5_CAP_MACSEC(mdev, cap)\
 	MLX5_GET(macsec_cap, (mdev)->caps.hca[MLX5_CAP_MACSEC]->cur, cap)
 
+#define MLX5_CAP_SHAMPO(mdev, cap) \
+	MLX5_GET(shampo_cap, mdev->caps.hca[MLX5_CAP_SHAMPO]->cur, cap)
+
 enum {
 	MLX5_CMD_STAT_OK			= 0x0,
 	MLX5_CMD_STAT_INT_ERR			= 0x1,

include/linux/mlx5/mlx5_ifc.h

@@ -2327,7 +2327,9 @@ struct mlx5_ifc_wq_bits {
 	u8         headers_mkey[0x20];
 
 	u8         shampo_enable[0x1];
-	u8         reserved_at_1e1[0x4];
+	u8         reserved_at_1e1[0x1];
+	u8         shampo_mode[0x2];
+	u8         reserved_at_1e4[0x1];
 	u8         log_reservation_size[0x3];
 	u8         reserved_at_1e8[0x5];
 	u8         log_max_num_of_packets_per_reservation[0x3];
@@ -3699,6 +3701,22 @@ struct mlx5_ifc_crypto_cap_bits {
 	u8    reserved_at_80[0x780];
 };
 
+struct mlx5_ifc_shampo_cap_bits {
+	u8    reserved_at_0[0x3];
+	u8    shampo_log_max_reservation_size[0x5];
+	u8    reserved_at_8[0x3];
+	u8    shampo_log_min_reservation_size[0x5];
+	u8    shampo_min_mss_size[0x10];
+
+	u8    shampo_header_split[0x1];
+	u8    shampo_header_split_data_merge[0x1];
+	u8    reserved_at_22[0x1];
+	u8    shampo_log_max_headers_entry_size[0x5];
+	u8    reserved_at_28[0x18];
+
+	u8    reserved_at_40[0x7c0];
+};
+
 union mlx5_ifc_hca_cap_union_bits {
 	struct mlx5_ifc_cmd_hca_cap_bits cmd_hca_cap;
 	struct mlx5_ifc_cmd_hca_cap_2_bits cmd_hca_cap_2;