netdev - [PATCH mlx5-next 3/4] net/mlx5: SHAMPO: Introduce new SHAMPO specific HCA caps

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Message-ID: <20250109204231.1809851-4-tariqt@nvidia.com>
Date: Thu, 9 Jan 2025 22:42:30 +0200
From: Tariq Toukan <tariqt@...dia.com>
To: Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leonro@...dia.com>,
	Jason Gunthorpe <jgg@...dia.com>
CC: <netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>, Jakub Kicinski
	<kuba@...nel.org>, Gal Pressman <gal@...dia.com>, Mark Bloch
	<mbloch@...dia.com>, Moshe Shemesh <moshe@...dia.com>, Dragos Tatulea
	<dtatulea@...dia.com>, Tariq Toukan <tariqt@...dia.com>
Subject: [PATCH mlx5-next 3/4] net/mlx5: SHAMPO: Introduce new SHAMPO specific HCA caps

From: Saeed Mahameed <saeedm@...dia.com>

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

Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
Reviewed-by: Dragos Tatulea <dtatulea@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/fw.c  |  6 ++++++
 .../net/ethernet/mellanox/mlx5/core/main.c    |  5 +++++
 include/linux/mlx5/device.h                   |  4 ++++
 include/linux/mlx5/mlx5_ifc.h                 | 20 ++++++++++++++++++-
 4 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fw.c b/drivers/net/ethernet/mellanox/mlx5/core/fw.c
index 76ad46bf477d..b253d1673398 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fw.c
+++ b/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;
 }
 
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index 220a9ac75c8b..a670e4538a13 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/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)
diff --git a/include/linux/mlx5/device.h b/include/linux/mlx5/device.h
index cc647992f3d1..0c48b20f818a 100644
--- a/include/linux/mlx5/device.h
+++ b/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,
diff --git a/include/linux/mlx5/mlx5_ifc.h b/include/linux/mlx5/mlx5_ifc.h
index 221146278ac8..d7c91f152735 100644
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/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;
-- 
2.45.0