[PATCH net-next V3 06/15] net/mlx5e: ipsec: Move RX marker from ft_metadata to flow_tag
From: Tariq Toukan <tariqt@nvidia.com>
Date: 2026-09-03 08:54:35
Also in:
bpf, linux-kselftest, linux-rdma, lkml
Subsystem:
mellanox ethernet driver (mlx5e), mellanox ethernet innova drivers, mellanox mlx5 core vpi driver, networking drivers, the rest · Maintainers:
Saeed Mahameed, Tariq Toukan, Mark Bloch, Leon Romanovsky, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Cosmin Ratiu <redacted> IPsec used BIT(31) in cqe.ft_metadata as a marker for ingress IPsec-decrypted packets. This will conflict with PSP which stores SPI in ft_metadata - an SPI with bit 31 set would falsely trigger mlx5_ipsec_is_rx_flow(). Define a new marker for IPsec in flow_tag and use it in steering rules. The obj_id stays in ft_metadata bits[23:0]. Remove the unused MARKER and SYNDROM (sic) macros. This is only done for IPsec NIC RX flows. The esw path uses a different mechanism and is unaffected: RX handling in mlx5e_rep_tc_receive() makes use of a few bits in ft_metadata to detect and hand off IPsec packets to mlx5e_ipsec_offload_handle_rx_skb(). An additional complication is that mlx5e_cqe_regb_chain() used the high order bits of ft_metadata to differentiate between TC chains and protocol markers. With the IPSec marker moving to flow_tag, this would falsely trigger mlx5e_cqe_regb_chain() to believe the chain is set, when in fact, ft_metadata is something completely different. Solve that by requiring that the new flow_tag proto is NONE, since only those packets can carry a chain id in ft_metadata. Signed-off-by: Cosmin Ratiu <redacted> Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com> Reviewed-by: Carolina Jubran <redacted> Signed-off-by: Tariq Toukan <tariqt@nvidia.com> --- .../ethernet/mellanox/mlx5/core/en_accel/flow_tag.h | 4 +++- .../ethernet/mellanox/mlx5/core/en_accel/ipsec_fs.c | 11 +++++++++-- .../ethernet/mellanox/mlx5/core/en_accel/ipsec_rxtx.h | 8 ++++---- drivers/net/ethernet/mellanox/mlx5/core/en_tc.h | 7 +++++-- 4 files changed, 21 insertions(+), 9 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/flow_tag.h b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/flow_tag.h
index b6fcd4b63031..cf30096d6a37 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/flow_tag.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/flow_tag.h@@ -14,8 +14,9 @@ * * [23:21] = protocol ID (3 bits): * 0 = none (default) + * 1 = IPsec * 3 = PSP (HW decrypted, PSP header present) - * 1,2,4-7 = reserved + * 2,4-7 = reserved * [20:16] = reserved * [15:0] = used by other subsystems (e.g. TC). */
@@ -24,6 +25,7 @@ enum { MLX5E_ACCEL_FLOW_TAG_PROTO_NONE = 0, + MLX5E_ACCEL_FLOW_TAG_PROTO_IPSEC = 1, MLX5E_ACCEL_FLOW_TAG_PROTO_PSP = 3, };
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_fs.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_fs.c
index f236672d3a2a..5565c385258c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_fs.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_fs.c@@ -5,6 +5,7 @@ #include "en.h" #include "en/fs.h" #include "en_accel/en_accel.h" +#include "en_accel/flow_tag.h" #include "eswitch.h" #include "ipsec.h" #include "fs_core.h"
@@ -190,7 +191,7 @@ static void ipsec_rx_rule_add_match_obj(struct mlx5e_ipsec_sa_entry *sa_entry, misc_parameters_2.metadata_reg_c_2); MLX5_SET(fte_match_param, spec->match_value, misc_parameters_2.metadata_reg_c_2, - sa_entry->ipsec_obj_id | BIT(31)); + sa_entry->ipsec_obj_id); spec->match_criteria_enable |= MLX5_MATCH_MISC_PARAMETERS_2; }
@@ -2066,7 +2067,7 @@ static int rx_add_rule(struct mlx5e_ipsec_sa_entry *sa_entry) if (!attrs->drop) { if (rx != ipsec->rx_esw) err = setup_modify_header(ipsec, attrs->type, - sa_entry->ipsec_obj_id | BIT(31), + sa_entry->ipsec_obj_id, XFRM_DEV_OFFLOAD_IN, &flow_act); else err = mlx5_esw_ipsec_rx_setup_modify_header(sa_entry, &flow_act);
@@ -2099,6 +2100,12 @@ static int rx_add_rule(struct mlx5e_ipsec_sa_entry *sa_entry) flow_act.action |= MLX5_FLOW_CONTEXT_ACTION_DROP; else flow_act.action |= MLX5_FLOW_CONTEXT_ACTION_FWD_DEST; + if (!attrs->drop && rx != ipsec->rx_esw) { + spec->flow_context.flags |= FLOW_CONTEXT_HAS_TAG; + spec->flow_context.flow_tag = + FIELD_PREP(MLX5E_ACCEL_FLOW_TAG_PROTO_MASK, + MLX5E_ACCEL_FLOW_TAG_PROTO_IPSEC); + } dest[0].type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE; dest[0].ft = rx->ft.status; dest[1].type = MLX5_FLOW_DESTINATION_TYPE_COUNTER;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_rxtx.h b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_rxtx.h
index 45b0d19e735c..57aabd5e61ec 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_rxtx.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_rxtx.h@@ -38,10 +38,9 @@ #include <net/xfrm.h> #include "en.h" #include "en/txrx.h" +#include "en_accel/flow_tag.h" -/* Bit31: IPsec marker, Bit30: reserved, Bit29-24: IPsec syndrome, Bit23-0: IPsec obj id */ -#define MLX5_IPSEC_METADATA_MARKER(metadata) ((((metadata) >> 30) & 0x3) == 0x2) -#define MLX5_IPSEC_METADATA_SYNDROM(metadata) (((metadata) >> 24) & GENMASK(5, 0)) +/* IPsec obj id in ft_metadata bits[23:0] */ #define MLX5_IPSEC_METADATA_HANDLE(metadata) ((metadata) & GENMASK(23, 0)) struct mlx5e_accel_tx_ipsec_state {
@@ -74,7 +73,8 @@ static inline unsigned int mlx5e_ipsec_tx_ids_len(struct mlx5e_accel_tx_ipsec_st static inline bool mlx5_ipsec_is_rx_flow(struct mlx5_cqe64 *cqe) { - return MLX5_IPSEC_METADATA_MARKER(be32_to_cpu(cqe->ft_metadata)); + return mlx5e_accel_flow_tag_proto(cqe) == + MLX5E_ACCEL_FLOW_TAG_PROTO_IPSEC; } static inline bool mlx5e_ipsec_eseg_meta(struct mlx5_wqe_eth_seg *eseg)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.h b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.h
index e1b8cb78369f..53b6043e33d2 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.h@@ -36,6 +36,7 @@ #include <net/pkt_cls.h> #include "en.h" #include "eswitch.h" +#include "en_accel/flow_tag.h" #include "en/tc_ct.h" #include "en/tc_tun.h" #include "en/tc/int_port.h"
@@ -370,11 +371,13 @@ struct mlx5e_tc_table *mlx5e_tc_table_alloc(void); void mlx5e_tc_table_free(struct mlx5e_tc_table *tc); static inline bool mlx5e_cqe_regb_chain(struct mlx5_cqe64 *cqe) { - u32 chain, reg_b; + u32 flow_tag, reg_b, chain; + flow_tag = mlx5e_accel_flow_tag_proto(cqe); reg_b = be32_to_cpu(cqe->ft_metadata); - if (reg_b >> (MLX5E_TC_TABLE_CHAIN_TAG_BITS + ESW_ZONE_ID_BITS)) + if (flow_tag != MLX5E_ACCEL_FLOW_TAG_PROTO_NONE || + (reg_b >> (MLX5E_TC_TABLE_CHAIN_TAG_BITS + ESW_ZONE_ID_BITS))) return false; chain = reg_b & MLX5E_TC_TABLE_CHAIN_TAG_MASK;
--
2.44.0