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Date: Tue, 14 Nov 2023 12:42:46 +0000
From: Aurelien Aptel <aaptel@...dia.com>
To: linux-nvme@...ts.infradead.org,
	netdev@...r.kernel.org,
	sagi@...mberg.me,
	hch@....de,
	kbusch@...nel.org,
	axboe@...com,
	chaitanyak@...dia.com,
	davem@...emloft.net,
	kuba@...nel.org
Cc: aaptel@...dia.com,
	aurelien.aptel@...il.com,
	smalin@...dia.com,
	malin1024@...il.com,
	ogerlitz@...dia.com,
	yorayz@...dia.com,
	borisp@...dia.com,
	galshalom@...dia.com,
	mgurtovoy@...dia.com
Subject: [PATCH v19 12/20] net/mlx5: Add NVMEoTCP caps, HW bits, 128B CQE and enumerations

From: Ben Ben-Ishay <benishay@...dia.com>

Add the necessary infrastructure for NVMEoTCP offload:
- Create mlx5_cqe128 structure for NVMEoTCP offload.
  The new structure consist from the regular mlx5_cqe64 +
  NVMEoTCP data information for offloaded packets.
- Add nvmetcp field to mlx5_cqe64, this field define the type
  of the data that the additional NVMEoTCP part represents.
- Add nvmeotcp_zero_copy_en + nvmeotcp_crc_en bit
  to the TIR, for identify NVMEoTCP offload flow
  and tag_buffer_id that will be used by the
  connected nvmeotcp_queues.
- Add new capability to HCA_CAP that represents the
  NVMEoTCP offload ability.

Signed-off-by: Ben Ben-Ishay <benishay@...dia.com>
Signed-off-by: Or Gerlitz <ogerlitz@...dia.com>
Signed-off-by: Aurelien Aptel <aaptel@...dia.com>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/fw.c |  6 ++
 include/linux/mlx5/device.h                  | 51 ++++++++++++-
 include/linux/mlx5/mlx5_ifc.h                | 75 ++++++++++++++++++--
 include/linux/mlx5/qp.h                      |  1 +
 4 files changed, 128 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fw.c b/drivers/net/ethernet/mellanox/mlx5/core/fw.c
index 58f4c0d0fafa..f1745f69337b 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fw.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fw.c
@@ -280,6 +280,12 @@ int mlx5_query_hca_caps(struct mlx5_core_dev *dev)
 			return err;
 	}
 
+	if (MLX5_CAP_GEN(dev, nvmeotcp)) {
+		err = mlx5_core_get_caps(dev, MLX5_CAP_DEV_NVMEOTCP);
+		if (err)
+			return err;
+	}
+
 	return 0;
 }
 
diff --git a/include/linux/mlx5/device.h b/include/linux/mlx5/device.h
index f1dde3c6a3f3..6416a5e8a8e6 100644
--- a/include/linux/mlx5/device.h
+++ b/include/linux/mlx5/device.h
@@ -264,6 +264,7 @@ enum {
 enum {
 	MLX5_MKEY_MASK_LEN		= 1ull << 0,
 	MLX5_MKEY_MASK_PAGE_SIZE	= 1ull << 1,
+	MLX5_MKEY_MASK_XLT_OCT_SIZE     = 1ull << 2,
 	MLX5_MKEY_MASK_START_ADDR	= 1ull << 6,
 	MLX5_MKEY_MASK_PD		= 1ull << 7,
 	MLX5_MKEY_MASK_EN_RINVAL	= 1ull << 8,
@@ -798,7 +799,11 @@ struct mlx5_err_cqe {
 
 struct mlx5_cqe64 {
 	u8		tls_outer_l3_tunneled;
-	u8		rsvd0;
+	u8		rsvd16bit:4;
+	u8		nvmeotcp_zc:1;
+	u8		nvmeotcp_ddgst:1;
+	u8		nvmeotcp_resync:1;
+	u8		rsvd23bit:1;
 	__be16		wqe_id;
 	union {
 		struct {
@@ -847,6 +852,19 @@ struct mlx5_cqe64 {
 	u8		op_own;
 };
 
+struct mlx5e_cqe128 {
+	__be16 cclen;
+	__be16 hlen;
+	union {
+		__be32 resync_tcp_sn;
+		__be32 ccoff;
+	};
+	__be16 ccid;
+	__be16 rsvd8;
+	u8 rsvd12[52];
+	struct mlx5_cqe64 cqe64;
+};
+
 struct mlx5_mini_cqe8 {
 	union {
 		__be32 rx_hash_result;
@@ -882,6 +900,28 @@ enum {
 
 #define MLX5_MINI_CQE_ARRAY_SIZE 8
 
+static inline bool cqe_is_nvmeotcp_resync(struct mlx5_cqe64 *cqe)
+{
+	return cqe->nvmeotcp_resync;
+}
+
+static inline bool cqe_is_nvmeotcp_crcvalid(struct mlx5_cqe64 *cqe)
+{
+	return cqe->nvmeotcp_ddgst;
+}
+
+static inline bool cqe_is_nvmeotcp_zc(struct mlx5_cqe64 *cqe)
+{
+	return cqe->nvmeotcp_zc;
+}
+
+/* check if cqe is zc or crc or resync */
+static inline bool cqe_is_nvmeotcp(struct mlx5_cqe64 *cqe)
+{
+	return cqe_is_nvmeotcp_zc(cqe) || cqe_is_nvmeotcp_crcvalid(cqe) ||
+	       cqe_is_nvmeotcp_resync(cqe);
+}
+
 static inline u8 mlx5_get_cqe_format(struct mlx5_cqe64 *cqe)
 {
 	return (cqe->op_own >> 2) & 0x3;
@@ -1222,6 +1262,7 @@ enum mlx5_cap_type {
 	MLX5_CAP_VDPA_EMULATION = 0x13,
 	MLX5_CAP_DEV_EVENT = 0x14,
 	MLX5_CAP_IPSEC,
+	MLX5_CAP_DEV_NVMEOTCP = 0x19,
 	MLX5_CAP_CRYPTO = 0x1a,
 	MLX5_CAP_MACSEC = 0x1f,
 	MLX5_CAP_GENERAL_2 = 0x20,
@@ -1429,6 +1470,14 @@ 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_DEV_NVMEOTCP(mdev, cap)\
+	MLX5_GET(nvmeotcp_cap, \
+		 (mdev)->caps.hca[MLX5_CAP_DEV_NVMEOTCP]->cur, cap)
+
+#define MLX5_CAP64_DEV_NVMEOTCP(mdev, cap)\
+	MLX5_GET64(nvmeotcp_cap, \
+		   (mdev)->caps.hca[MLX5_CAP_DEV_NVMEOTCP]->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 931b97d9153d..8324564c313c 100644
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/include/linux/mlx5/mlx5_ifc.h
@@ -1462,6 +1462,20 @@ enum {
 	MLX5_STEERING_FORMAT_CONNECTX_7   = 2,
 };
 
+struct mlx5_ifc_nvmeotcp_cap_bits {
+	u8    zerocopy[0x1];
+	u8    crc_rx[0x1];
+	u8    crc_tx[0x1];
+	u8    reserved_at_3[0x15];
+	u8    version[0x8];
+
+	u8    reserved_at_20[0x13];
+	u8    log_max_nvmeotcp_tag_buffer_table[0x5];
+	u8    reserved_at_38[0x3];
+	u8    log_max_nvmeotcp_tag_buffer_size[0x5];
+	u8    reserved_at_40[0x7c0];
+};
+
 struct mlx5_ifc_cmd_hca_cap_bits {
 	u8         reserved_at_0[0x10];
 	u8         shared_object_to_user_object_allowed[0x1];
@@ -1486,7 +1500,9 @@ struct mlx5_ifc_cmd_hca_cap_bits {
 	u8         event_cap[0x1];
 	u8         reserved_at_91[0x2];
 	u8         isolate_vl_tc_new[0x1];
-	u8         reserved_at_94[0x4];
+	u8         reserved_at_94[0x2];
+	u8         nvmeotcp[0x1];
+	u8         reserved_at_97[0x1];
 	u8         prio_tag_required[0x1];
 	u8         reserved_at_99[0x2];
 	u8         log_max_qp[0x5];
@@ -3475,6 +3491,7 @@ union mlx5_ifc_hca_cap_union_bits {
 	struct mlx5_ifc_macsec_cap_bits macsec_cap;
 	struct mlx5_ifc_crypto_cap_bits crypto_cap;
 	struct mlx5_ifc_ipsec_cap_bits ipsec_cap;
+	struct mlx5_ifc_nvmeotcp_cap_bits nvmeotcp_cap;
 	u8         reserved_at_0[0x8000];
 };
 
@@ -3727,7 +3744,9 @@ struct mlx5_ifc_tirc_bits {
 
 	u8         disp_type[0x4];
 	u8         tls_en[0x1];
-	u8         reserved_at_25[0x1b];
+	u8         nvmeotcp_zero_copy_en[0x1];
+	u8         nvmeotcp_crc_en[0x1];
+	u8         reserved_at_27[0x19];
 
 	u8         reserved_at_40[0x40];
 
@@ -3758,7 +3777,8 @@ struct mlx5_ifc_tirc_bits {
 
 	struct mlx5_ifc_rx_hash_field_select_bits rx_hash_field_selector_inner;
 
-	u8         reserved_at_2c0[0x4c0];
+	u8         nvmeotcp_tag_buffer_table_id[0x20];
+	u8         reserved_at_2e0[0x4a0];
 };
 
 enum {
@@ -11971,6 +11991,7 @@ enum {
 	MLX5_HCA_CAP_GENERAL_OBJECT_TYPES_ENCRYPTION_KEY = BIT_ULL(0xc),
 	MLX5_HCA_CAP_GENERAL_OBJECT_TYPES_IPSEC = BIT_ULL(0x13),
 	MLX5_HCA_CAP_GENERAL_OBJECT_TYPES_SAMPLER = BIT_ULL(0x20),
+	MLX5_HCA_CAP_GENERAL_OBJECT_TYPES_NVMEOTCP_TAG_BUFFER_TABLE = BIT_ULL(0x21),
 	MLX5_HCA_CAP_GENERAL_OBJECT_TYPES_FLOW_METER_ASO = BIT_ULL(0x24),
 };
 
@@ -11978,6 +11999,7 @@ enum {
 	MLX5_GENERAL_OBJECT_TYPES_ENCRYPTION_KEY = 0xc,
 	MLX5_GENERAL_OBJECT_TYPES_IPSEC = 0x13,
 	MLX5_GENERAL_OBJECT_TYPES_SAMPLER = 0x20,
+	MLX5_GENERAL_OBJECT_TYPES_NVMEOTCP_TAG_BUFFER_TABLE = 0x21,
 	MLX5_GENERAL_OBJECT_TYPES_FLOW_METER_ASO = 0x24,
 	MLX5_GENERAL_OBJECT_TYPES_MACSEC = 0x27,
 	MLX5_GENERAL_OBJECT_TYPES_INT_KEK = 0x47,
@@ -12344,6 +12366,20 @@ struct mlx5_ifc_query_sampler_obj_out_bits {
 	struct mlx5_ifc_sampler_obj_bits sampler_object;
 };
 
+struct mlx5_ifc_nvmeotcp_tag_buf_table_obj_bits {
+	u8    modify_field_select[0x40];
+
+	u8    reserved_at_40[0x20];
+
+	u8    reserved_at_60[0x1b];
+	u8    log_tag_buffer_table_size[0x5];
+};
+
+struct mlx5_ifc_create_nvmeotcp_tag_buf_table_in_bits {
+	struct mlx5_ifc_general_obj_in_cmd_hdr_bits general_obj_in_cmd_hdr;
+	struct mlx5_ifc_nvmeotcp_tag_buf_table_obj_bits nvmeotcp_tag_buf_table_obj;
+};
+
 enum {
 	MLX5_GENERAL_OBJECT_TYPE_ENCRYPTION_KEY_KEY_SIZE_128 = 0x0,
 	MLX5_GENERAL_OBJECT_TYPE_ENCRYPTION_KEY_KEY_SIZE_256 = 0x1,
@@ -12357,6 +12393,13 @@ enum {
 
 enum {
 	MLX5_TRANSPORT_STATIC_PARAMS_ACC_TYPE_TLS               = 0x1,
+	MLX5_TRANSPORT_STATIC_PARAMS_ACC_TYPE_NVMETCP           = 0x2,
+	MLX5_TRANSPORT_STATIC_PARAMS_ACC_TYPE_NVMETCP_WITH_TLS  = 0x3,
+};
+
+enum {
+	MLX5_TRANSPORT_STATIC_PARAMS_TI_INITIATOR  = 0x0,
+	MLX5_TRANSPORT_STATIC_PARAMS_TI_TARGET     = 0x1,
 };
 
 struct mlx5_ifc_transport_static_params_bits {
@@ -12379,7 +12422,20 @@ struct mlx5_ifc_transport_static_params_bits {
 	u8         reserved_at_100[0x8];
 	u8         dek_index[0x18];
 
-	u8         reserved_at_120[0xe0];
+	u8         reserved_at_120[0x14];
+
+	u8         cccid_ttag[0x1];
+	u8         ti[0x1];
+	u8         zero_copy_en[0x1];
+	u8         ddgst_offload_en[0x1];
+	u8         hdgst_offload_en[0x1];
+	u8         ddgst_en[0x1];
+	u8         hddgst_en[0x1];
+	u8         pda[0x5];
+
+	u8         nvme_resync_tcp_sn[0x20];
+
+	u8         reserved_at_160[0xa0];
 };
 
 struct mlx5_ifc_tls_progress_params_bits {
@@ -12678,4 +12734,15 @@ struct mlx5_ifc_msees_reg_bits {
 	u8         reserved_at_80[0x180];
 };
 
+struct mlx5_ifc_nvmeotcp_progress_params_bits {
+	u8    next_pdu_tcp_sn[0x20];
+
+	u8    hw_resync_tcp_sn[0x20];
+
+	u8    pdu_tracker_state[0x2];
+	u8    offloading_state[0x2];
+	u8    reserved_at_44[0xc];
+	u8    cccid_ttag[0x10];
+};
+
 #endif /* MLX5_IFC_H */
diff --git a/include/linux/mlx5/qp.h b/include/linux/mlx5/qp.h
index bd53cf4be7bd..b72f08efe6de 100644
--- a/include/linux/mlx5/qp.h
+++ b/include/linux/mlx5/qp.h
@@ -227,6 +227,7 @@ struct mlx5_wqe_ctrl_seg {
 #define MLX5_WQE_CTRL_OPCODE_MASK 0xff
 #define MLX5_WQE_CTRL_WQE_INDEX_MASK 0x00ffff00
 #define MLX5_WQE_CTRL_WQE_INDEX_SHIFT 8
+#define MLX5_WQE_CTRL_TIR_TIS_INDEX_SHIFT 8
 
 enum {
 	MLX5_ETH_WQE_L3_INNER_CSUM      = 1 << 4,
-- 
2.34.1


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