Merge tag 'mlx5-updates-2024-09-02' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux

Saeed Mahameed says:

====================
mlx5-updates-2024-08-29

HW-Managed Flow Steering in mlx5 driver

Yevgeny Kliteynik says:
=======================

1. Overview
-----------

ConnectX devices support packet matching, modification, and redirection.
This functionality is referred as Flow Steering.
To configure a steering rule, the rule is written to the device-owned
memory. This memory is accessed and cached by the device when processing
a packet.

The first implementation of Flow Steering was done in FW, and it is
referred in the mlx5 driver as Device-Managed Flow Steering (DMFS).
Later we introduced SW-managed Flow Steering (SWS or SMFS), where the
driver is writing directly to the device's configuration memory (ICM)
through RC QP using RDMA operations (RDMA-read and RDAM-write), thus
achieving higher rates of rule insertion/deletion.

Now we introduce a new flow steering implementation: HW-Managed Flow
Steering (HWS or HMFS).

In this new approach, the driver is configuring steering rules directly
to the HW using the WQs with a special new type of WQE. This way we can
reach higher rule insertion/deletion rate with much lower CPU utilization
compared to SWS.

The key benefits of HWS as opposed to SWS:
+ HW manages the steering decision tree
   - HW calculates CRC for each entry
   - HW handles tree hash collisions
   - HW & FW manage objects refcount
+ HW keeps cache coherency:
   - HW provides tree access locking and synchronization
   - HW provides notification on completion
+ Insertion rate isn’t affected by background traffic
   - Dedicated HW components that handle insertion

2. Performance
--------------

Measuring Connection Tracking with simple IPv4 flows w/o NAT, we
are able to get ~5 times more flows offloaded per second using HWS.

3. Configuration
----------------

The enablement of HWS mode in eswitch manager is done using the same
devlink param that is already used for switching between FW-managed
steering and SW-managed steering modes:

  # devlink dev param set pci/<PCI_ID> name flow_steering_mode cmod runtime value hmfs

4. Upstream Submission
----------------------

HWS support consists of 3 main components:
+ Steering:
   - The lower layer that exposes HWS API to upper layers and implements
     all the management of flow steering building blocks
+ FS-Core
   - Implementation of fs_hws layer to enable fs_core to use HWS instead
     of FW or SW steering
   - Create HW steering action pools to utilize the ability of HWS to
     share steering actions among different rules
   - Add support for configuring HWS mode through devlink command,
     similar to configuring SWS mode
+ Connection Tracking
   - Implementation of CT support for HW steering
   - Hooks up the CT ops for the new steering mode and uses the HWS API
     to implement connection tracking.

Because of the large number of patches, we need to perform the submission
in several separate patch series. This series is the first submission that
lays the ground work for the next submissions, where an actual user of HWS
will be added.

5. Patches in this series
-------------------------

This patch series contains implementation of the first bullet from above.

=======================

* tag 'mlx5-updates-2024-09-02' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux:
  net/mlx5: HWS, added API and enabled HWS support
  net/mlx5: HWS, added send engine and context handling
  net/mlx5: HWS, added debug dump and internal headers
  net/mlx5: HWS, added backward-compatible API handling
  net/mlx5: HWS, added memory management handling
  net/mlx5: HWS, added vport handling
  net/mlx5: HWS, added modify header pattern and args handling
  net/mlx5: HWS, added FW commands handling
  net/mlx5: HWS, added matchers functionality
  net/mlx5: HWS, added definers handling
  net/mlx5: HWS, added rules handling
  net/mlx5: HWS, added tables handling
  net/mlx5: HWS, added actions handling
  net/mlx5: Added missing definitions in preparation for HW Steering
  net/mlx5: Added missing mlx5_ifc definition for HW Steering
====================

Link: https://patch.msgid.link/20240909181250.41596-1-saeed@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

2 files changed, 162 insertions, 28 deletions

diff --git a/include/linux/mlx5/mlx5_ifc.h b/include/linux/mlx5/mlx5_ifc.h
index 234ad6f16e92..b6f8e3834bd3 100644
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/include/linux/mlx5/mlx5_ifc.h
@@ -80,23 +80,15 @@ enum {
 
 enum {
 	MLX5_OBJ_TYPE_SW_ICM = 0x0008,
-	MLX5_OBJ_TYPE_HEADER_MODIFY_ARGUMENT  = 0x23,
-};
-
-enum {
-	MLX5_GENERAL_OBJ_TYPES_CAP_SW_ICM = (1ULL << MLX5_OBJ_TYPE_SW_ICM),
-	MLX5_GENERAL_OBJ_TYPES_CAP_GENEVE_TLV_OPT = (1ULL << 11),
-	MLX5_GENERAL_OBJ_TYPES_CAP_VIRTIO_NET_Q = (1ULL << 13),
-	MLX5_GENERAL_OBJ_TYPES_CAP_HEADER_MODIFY_ARGUMENT =
-		(1ULL << MLX5_OBJ_TYPE_HEADER_MODIFY_ARGUMENT),
-	MLX5_GENERAL_OBJ_TYPES_CAP_MACSEC_OFFLOAD = (1ULL << 39),
-};
-
-enum {
 	MLX5_OBJ_TYPE_GENEVE_TLV_OPT = 0x000b,
 	MLX5_OBJ_TYPE_VIRTIO_NET_Q = 0x000d,
 	MLX5_OBJ_TYPE_VIRTIO_Q_COUNTERS = 0x001c,
 	MLX5_OBJ_TYPE_MATCH_DEFINER = 0x0018,
+	MLX5_OBJ_TYPE_HEADER_MODIFY_ARGUMENT  = 0x23,
+	MLX5_OBJ_TYPE_STC = 0x0040,
+	MLX5_OBJ_TYPE_RTC = 0x0041,
+	MLX5_OBJ_TYPE_STE = 0x0042,
+	MLX5_OBJ_TYPE_MODIFY_HDR_PATTERN = 0x0043,
 	MLX5_OBJ_TYPE_PAGE_TRACK = 0x46,
 	MLX5_OBJ_TYPE_MKEY = 0xff01,
 	MLX5_OBJ_TYPE_QP = 0xff02,
@@ -112,6 +104,16 @@ enum {
 	MLX5_OBJ_TYPE_RQT = 0xff0e,
 	MLX5_OBJ_TYPE_FLOW_COUNTER = 0xff0f,
 	MLX5_OBJ_TYPE_CQ = 0xff10,
+	MLX5_OBJ_TYPE_FT_ALIAS = 0xff15,
+};
+
+enum {
+	MLX5_GENERAL_OBJ_TYPES_CAP_SW_ICM = (1ULL << MLX5_OBJ_TYPE_SW_ICM),
+	MLX5_GENERAL_OBJ_TYPES_CAP_GENEVE_TLV_OPT = (1ULL << 11),
+	MLX5_GENERAL_OBJ_TYPES_CAP_VIRTIO_NET_Q = (1ULL << 13),
+	MLX5_GENERAL_OBJ_TYPES_CAP_HEADER_MODIFY_ARGUMENT =
+		(1ULL << MLX5_OBJ_TYPE_HEADER_MODIFY_ARGUMENT),
+	MLX5_GENERAL_OBJ_TYPES_CAP_MACSEC_OFFLOAD = (1ULL << 39),
 };
 
 enum {
@@ -313,6 +315,7 @@ enum {
 	MLX5_CMD_OP_MODIFY_VHCA_STATE             = 0xb0e,
 	MLX5_CMD_OP_SYNC_CRYPTO                   = 0xb12,
 	MLX5_CMD_OP_ALLOW_OTHER_VHCA_ACCESS       = 0xb16,
+	MLX5_CMD_OP_GENERATE_WQE                  = 0xb17,
 	MLX5_CMD_OP_MAX
 };
 
@@ -485,7 +488,13 @@ struct mlx5_ifc_flow_table_prop_layout_bits {
 	u8         reserved_at_66[0x2];
 	u8         reformat_add_macsec[0x1];
 	u8         reformat_remove_macsec[0x1];
-	u8         reserved_at_6a[0xe];
+	u8         reparse[0x1];
+	u8         reserved_at_6b[0x1];
+	u8         cross_vhca_object[0x1];
+	u8         reformat_l2_to_l3_audp_tunnel[0x1];
+	u8         reformat_l3_audp_tunnel_to_l2[0x1];
+	u8         ignore_flow_level_rtc_valid[0x1];
+	u8         reserved_at_70[0x8];
 	u8         log_max_ft_num[0x8];
 
 	u8         reserved_at_80[0x10];
@@ -522,7 +531,15 @@ struct mlx5_ifc_ipv6_layout_bits {
 	u8         ipv6[16][0x8];
 };
 
+struct mlx5_ifc_ipv6_simple_layout_bits {
+	u8         ipv6_127_96[0x20];
+	u8         ipv6_95_64[0x20];
+	u8         ipv6_63_32[0x20];
+	u8         ipv6_31_0[0x20];
+};
+
 union mlx5_ifc_ipv6_layout_ipv4_layout_auto_bits {
+	struct mlx5_ifc_ipv6_simple_layout_bits ipv6_simple_layout;
 	struct mlx5_ifc_ipv6_layout_bits ipv6_layout;
 	struct mlx5_ifc_ipv4_layout_bits ipv4_layout;
 	u8         reserved_at_0[0x80];
@@ -911,7 +928,9 @@ struct mlx5_ifc_flow_table_eswitch_cap_bits {
 	u8      reserved_at_8[0x5];
 	u8      fdb_uplink_hairpin[0x1];
 	u8      fdb_multi_path_any_table_limit_regc[0x1];
-	u8      reserved_at_f[0x3];
+	u8      reserved_at_f[0x1];
+	u8      fdb_dynamic_tunnel[0x1];
+	u8      reserved_at_11[0x1];
 	u8      fdb_multi_path_any_table[0x1];
 	u8      reserved_at_13[0x2];
 	u8      fdb_modify_header_fwd_to_table[0x1];
@@ -950,6 +969,73 @@ struct mlx5_ifc_flow_table_eswitch_cap_bits {
 	u8      reserved_at_1900[0x6700];
 };
 
+struct mlx5_ifc_wqe_based_flow_table_cap_bits {
+	u8         reserved_at_0[0x3];
+	u8         log_max_num_ste[0x5];
+	u8         reserved_at_8[0x3];
+	u8         log_max_num_stc[0x5];
+	u8         reserved_at_10[0x3];
+	u8         log_max_num_rtc[0x5];
+	u8         reserved_at_18[0x3];
+	u8         log_max_num_header_modify_pattern[0x5];
+
+	u8         rtc_hash_split_table[0x1];
+	u8         rtc_linear_lookup_table[0x1];
+	u8         reserved_at_22[0x1];
+	u8         stc_alloc_log_granularity[0x5];
+	u8         reserved_at_28[0x3];
+	u8         stc_alloc_log_max[0x5];
+	u8         reserved_at_30[0x3];
+	u8         ste_alloc_log_granularity[0x5];
+	u8         reserved_at_38[0x3];
+	u8         ste_alloc_log_max[0x5];
+
+	u8         reserved_at_40[0xb];
+	u8         rtc_reparse_mode[0x5];
+	u8         reserved_at_50[0x3];
+	u8         rtc_index_mode[0x5];
+	u8         reserved_at_58[0x3];
+	u8         rtc_log_depth_max[0x5];
+
+	u8         reserved_at_60[0x10];
+	u8         ste_format[0x10];
+
+	u8         stc_action_type[0x80];
+
+	u8         header_insert_type[0x10];
+	u8         header_remove_type[0x10];
+
+	u8         trivial_match_definer[0x20];
+
+	u8         reserved_at_140[0x1b];
+	u8         rtc_max_num_hash_definer_gen_wqe[0x5];
+
+	u8         reserved_at_160[0x18];
+	u8         access_index_mode[0x8];
+
+	u8         reserved_at_180[0x10];
+	u8         ste_format_gen_wqe[0x10];
+
+	u8         linear_match_definer_reg_c3[0x20];
+
+	u8         fdb_jump_to_tir_stc[0x1];
+	u8         reserved_at_1c1[0x1f];
+};
+
+struct mlx5_ifc_esw_cap_bits {
+	u8         reserved_at_0[0x1d];
+	u8         merged_eswitch[0x1];
+	u8         reserved_at_1e[0x2];
+
+	u8         reserved_at_20[0x40];
+
+	u8         esw_manager_vport_number_valid[0x1];
+	u8         reserved_at_61[0xf];
+	u8         esw_manager_vport_number[0x10];
+
+	u8         reserved_at_80[0x780];
+};
+
 enum {
 	MLX5_COUNTER_SOURCE_ESWITCH = 0x0,
 	MLX5_COUNTER_FLOW_ESWITCH   = 0x1,
@@ -1443,9 +1529,13 @@ enum {
 };
 
 enum {
+	MLX5_FLEX_IPV4_OVER_VXLAN_ENABLED	= 1 << 0,
+	MLX5_FLEX_IPV6_OVER_VXLAN_ENABLED	= 1 << 1,
+	MLX5_FLEX_IPV6_OVER_IP_ENABLED		= 1 << 2,
 	MLX5_FLEX_PARSER_GENEVE_ENABLED		= 1 << 3,
 	MLX5_FLEX_PARSER_MPLS_OVER_GRE_ENABLED	= 1 << 4,
 	MLX5_FLEX_PARSER_MPLS_OVER_UDP_ENABLED	= 1 << 5,
+	MLX5_FLEX_P_BIT_VXLAN_GPE_ENABLED	= 1 << 6,
 	MLX5_FLEX_PARSER_VXLAN_GPE_ENABLED	= 1 << 7,
 	MLX5_FLEX_PARSER_ICMP_V4_ENABLED	= 1 << 8,
 	MLX5_FLEX_PARSER_ICMP_V6_ENABLED	= 1 << 9,
@@ -1650,7 +1740,8 @@ struct mlx5_ifc_cmd_hca_cap_bits {
 	u8         pci_sync_for_fw_update_event[0x1];
 	u8         reserved_at_1f2[0x6];
 	u8         init2_lag_tx_port_affinity[0x1];
-	u8         reserved_at_1fa[0x3];
+	u8         reserved_at_1fa[0x2];
+	u8         wqe_based_flow_table_update_cap[0x1];
 	u8         cqe_version[0x4];
 
 	u8         compact_address_vector[0x1];
@@ -1959,7 +2050,7 @@ struct mlx5_ifc_cmd_hca_cap_bits {
 
 	u8         reserved_at_760[0x3];
 	u8         log_max_num_header_modify_argument[0x5];
-	u8         reserved_at_768[0x4];
+	u8         log_header_modify_argument_granularity_offset[0x4];
 	u8         log_header_modify_argument_granularity[0x4];
 	u8         reserved_at_770[0x3];
 	u8         log_header_modify_argument_max_alloc[0x5];
@@ -2006,7 +2097,8 @@ struct mlx5_ifc_cmd_hca_cap_2_bits {
 	u8	   reserved_at_140[0x60];
 
 	u8	   flow_table_type_2_type[0x8];
-	u8	   reserved_at_1a8[0x3];
+	u8	   reserved_at_1a8[0x2];
+	u8         format_select_dw_8_6_ext[0x1];
 	u8	   log_min_mkey_entity_size[0x5];
 	u8	   reserved_at_1b0[0x10];
 
@@ -2022,6 +2114,16 @@ struct mlx5_ifc_cmd_hca_cap_2_bits {
 	u8	   reserved_at_250[0x10];
 
 	u8	   reserved_at_260[0x120];
+
+	u8	   format_select_dw_gtpu_dw_0[0x8];
+	u8	   format_select_dw_gtpu_dw_1[0x8];
+	u8	   format_select_dw_gtpu_dw_2[0x8];
+	u8	   format_select_dw_gtpu_first_ext_dw_0[0x8];
+
+	u8	   generate_wqe_type[0x20];
+
+	u8	   reserved_at_2c0[0xc0];
+
 	u8	   reserved_at_380[0xb];
 	u8	   min_mkey_log_entity_size_fixed_buffer[0x5];
 	u8	   ec_vf_vport_base[0x10];
@@ -2037,9 +2139,11 @@ struct mlx5_ifc_cmd_hca_cap_2_bits {
 
 	u8	   reserved_at_400[0x1];
 	u8	   min_mkey_log_entity_size_fixed_buffer_valid[0x1];
-	u8	   reserved_at_402[0x1e];
+	u8	   reserved_at_402[0xe];
+	u8	   return_reg_id[0x10];
 
-	u8	   reserved_at_420[0x20];
+	u8	   reserved_at_420[0x1c];
+	u8	   flow_table_hash_type[0x4];
 
 	u8	   reserved_at_440[0x8];
 	u8	   max_num_eqs_24b[0x18];
@@ -2086,7 +2190,7 @@ struct mlx5_ifc_extended_dest_format_bits {
 	u8         reserved_at_60[0x20];
 };
 
-union mlx5_ifc_dest_format_struct_flow_counter_list_auto_bits {
+union mlx5_ifc_dest_format_flow_counter_list_auto_bits {
 	struct mlx5_ifc_extended_dest_format_bits extended_dest_format;
 	struct mlx5_ifc_flow_counter_list_bits flow_counter_list;
 };
@@ -2178,7 +2282,10 @@ struct mlx5_ifc_wq_bits {
 	u8         reserved_at_139[0x4];
 	u8         log_wqe_stride_size[0x3];
 
-	u8         reserved_at_140[0x80];
+	u8         dbr_umem_id[0x20];
+	u8         wq_umem_id[0x20];
+
+	u8         wq_umem_offset[0x40];
 
 	u8         headers_mkey[0x20];
 
@@ -3562,6 +3669,8 @@ union mlx5_ifc_hca_cap_union_bits {
 	struct mlx5_ifc_per_protocol_networking_offload_caps_bits per_protocol_networking_offload_caps;
 	struct mlx5_ifc_flow_table_nic_cap_bits flow_table_nic_cap;
 	struct mlx5_ifc_flow_table_eswitch_cap_bits flow_table_eswitch_cap;
+	struct mlx5_ifc_wqe_based_flow_table_cap_bits wqe_based_flow_table_cap;
+	struct mlx5_ifc_esw_cap_bits esw_cap;
 	struct mlx5_ifc_e_switch_cap_bits e_switch_cap;
 	struct mlx5_ifc_port_selection_cap_bits port_selection_cap;
 	struct mlx5_ifc_qos_cap_bits qos_cap;
@@ -3678,7 +3787,7 @@ struct mlx5_ifc_flow_context_bits {
 
 	u8         reserved_at_1300[0x500];
 
-	union mlx5_ifc_dest_format_struct_flow_counter_list_auto_bits destination[];
+	union mlx5_ifc_dest_format_flow_counter_list_auto_bits destination[];
 };
 
 enum {
@@ -3919,7 +4028,8 @@ struct mlx5_ifc_sqc_bits {
 	u8         reg_umr[0x1];
 	u8         allow_swp[0x1];
 	u8         hairpin[0x1];
-	u8         reserved_at_f[0xb];
+	u8         non_wire[0x1];
+	u8         reserved_at_10[0xa];
 	u8	   ts_format[0x2];
 	u8	   reserved_at_1c[0x4];
 
@@ -4961,6 +5071,16 @@ struct mlx5_ifc_set_fte_in_bits {
 	struct mlx5_ifc_flow_context_bits flow_context;
 };
 
+struct mlx5_ifc_dest_format_bits {
+	u8         destination_type[0x8];
+	u8         destination_id[0x18];
+
+	u8         destination_eswitch_owner_vhca_id_valid[0x1];
+	u8         packet_reformat[0x1];
+	u8         reserved_at_22[0xe];
+	u8         destination_eswitch_owner_vhca_id[0x10];
+};
+
 struct mlx5_ifc_rts2rts_qp_out_bits {
 	u8         status[0x8];
 	u8         reserved_at_8[0x18];
@@ -6127,7 +6247,8 @@ struct mlx5_ifc_flow_table_context_bits {
 	u8         termination_table[0x1];
 	u8         table_miss_action[0x4];
 	u8         level[0x8];
-	u8         reserved_at_10[0x8];
+	u8         rtc_valid[0x1];
+	u8         reserved_at_11[0x7];
 	u8         log_size[0x8];
 
 	u8         reserved_at_20[0x8];
@@ -6137,11 +6258,21 @@ struct mlx5_ifc_flow_table_context_bits {
 	u8         lag_master_next_table_id[0x18];
 
 	u8         reserved_at_60[0x60];
+	union {
+		struct {
+			u8         sw_owner_icm_root_1[0x40];
+
+			u8         sw_owner_icm_root_0[0x40];
+		} sws;
+		struct {
+			u8         rtc_id_0[0x20];
 
-	u8         sw_owner_icm_root_1[0x40];
+			u8         rtc_id_1[0x20];
 
-	u8         sw_owner_icm_root_0[0x40];
+			u8         reserved_at_100[0x40];
 
+		} hws;
+	};
 };
 
 struct mlx5_ifc_query_flow_table_out_bits {
@@ -8923,7 +9054,9 @@ struct mlx5_ifc_create_qp_in_bits {
 
 	struct mlx5_ifc_qpc_bits qpc;
 
-	u8         reserved_at_800[0x60];
+	u8         wq_umem_offset[0x40];
+
+	u8         wq_umem_id[0x20];
 
 	u8         wq_umem_valid[0x1];
 	u8         reserved_at_861[0x1f];
diff --git a/include/linux/mlx5/qp.h b/include/linux/mlx5/qp.h
index ad1ce650146c..fc7eeff99a8a 100644
--- a/include/linux/mlx5/qp.h
+++ b/include/linux/mlx5/qp.h
@@ -149,6 +149,7 @@ enum {
 	MLX5_WQE_CTRL_CQ_UPDATE		= 2 << 2,
 	MLX5_WQE_CTRL_CQ_UPDATE_AND_EQE	= 3 << 2,
 	MLX5_WQE_CTRL_SOLICITED		= 1 << 1,
+	MLX5_WQE_CTRL_INITIATOR_SMALL_FENCE = 1 << 5,
 };
 
 enum {