net/mlx5e: IPsec, support upper protocol selector field offload

Add support to policy/state upper protocol selector field offload,
this will enable to select traffic for IPsec operation based on l4
protocol (TCP/UDP) with specific source/destination port.

Signed-off-by: Raed Salem <raeds@nvidia.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

Author: raed-salem

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c

@@ -158,6 +158,11 @@ void mlx5e_ipsec_build_accel_xfrm_attrs(struct mlx5e_ipsec_sa_entry *sa_entry,
 	attrs->family = x->props.family;
 	attrs->type = x->xso.type;
 	attrs->reqid = x->props.reqid;
+	attrs->upspec.dport = ntohs(x->sel.dport);
+	attrs->upspec.dport_mask = ntohs(x->sel.dport_mask);
+	attrs->upspec.sport = ntohs(x->sel.sport);
+	attrs->upspec.sport_mask = ntohs(x->sel.sport_mask);
+	attrs->upspec.proto = x->sel.proto;
 
 	mlx5e_ipsec_init_limits(sa_entry, attrs);
 }
@@ -221,6 +226,13 @@ static int mlx5e_xfrm_validate_state(struct mlx5_core_dev *mdev,
 		NL_SET_ERR_MSG_MOD(extack, "Cannot offload xfrm states with geniv other than seqiv");
 		return -EINVAL;
 	}
+
+	if (x->sel.proto != IPPROTO_IP &&
+	    (x->sel.proto != IPPROTO_UDP || x->xso.dir != XFRM_DEV_OFFLOAD_OUT)) {
+		NL_SET_ERR_MSG_MOD(extack, "Device does not support upper protocol other than UDP, and only Tx direction");
+		return -EINVAL;
+	}
+
 	switch (x->xso.type) {
 	case XFRM_DEV_OFFLOAD_CRYPTO:
 		if (!(mlx5_ipsec_device_caps(mdev) & MLX5_IPSEC_CAP_CRYPTO)) {
@@ -517,6 +529,12 @@ static int mlx5e_xfrm_validate_policy(struct xfrm_policy *x,
 		return -EINVAL;
 	}
 
+	if (x->selector.proto != IPPROTO_IP &&
+	    (x->selector.proto != IPPROTO_UDP || x->xdo.dir != XFRM_DEV_OFFLOAD_OUT)) {
+		NL_SET_ERR_MSG_MOD(extack, "Device does not support upper protocol other than UDP, and only Tx direction");
+		return -EINVAL;
+	}
+
 	return 0;
 }
 
@@ -537,6 +555,11 @@ mlx5e_ipsec_build_accel_pol_attrs(struct mlx5e_ipsec_pol_entry *pol_entry,
 	attrs->action = x->action;
 	attrs->type = XFRM_DEV_OFFLOAD_PACKET;
 	attrs->reqid = x->xfrm_vec[0].reqid;
+	attrs->upspec.dport = ntohs(sel->dport);
+	attrs->upspec.dport_mask = ntohs(sel->dport_mask);
+	attrs->upspec.sport = ntohs(sel->sport);
+	attrs->upspec.sport_mask = ntohs(sel->sport_mask);
+	attrs->upspec.proto = sel->proto;
 }
 
 static int mlx5e_xfrm_add_policy(struct xfrm_policy *x,

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.h

@@ -52,6 +52,14 @@ struct aes_gcm_keymat {
 	u32   aes_key[256 / 32];
 };
 
+struct upspec {
+	u16 dport;
+	u16 dport_mask;
+	u16 sport;
+	u16 sport_mask;
+	u8 proto;
+};
+
 struct mlx5_accel_esp_xfrm_attrs {
 	u32   esn;
 	u32   spi;
@@ -68,6 +76,7 @@ struct mlx5_accel_esp_xfrm_attrs {
 		__be32 a6[4];
 	} daddr;
 
+	struct upspec upspec;
 	u8 dir : 2;
 	u8 esn_overlap : 1;
 	u8 esn_trigger : 1;
@@ -181,6 +190,7 @@ struct mlx5_accel_pol_xfrm_attrs {
 		__be32 a6[4];
 	} daddr;
 
+	struct upspec upspec;
 	u8 family;
 	u8 action;
 	u8 type : 2;

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_fs.c

@@ -467,6 +467,27 @@ static void setup_fte_reg_c0(struct mlx5_flow_spec *spec, u32 reqid)
 		 misc_parameters_2.metadata_reg_c_0, reqid);
 }
 
+static void setup_fte_upper_proto_match(struct mlx5_flow_spec *spec, struct upspec *upspec)
+{
+	if (upspec->proto != IPPROTO_UDP)
+		return;
+
+	spec->match_criteria_enable |= MLX5_MATCH_OUTER_HEADERS;
+	MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, spec->match_criteria, ip_protocol);
+	MLX5_SET(fte_match_set_lyr_2_4, spec->match_value, ip_protocol, upspec->proto);
+	if (upspec->dport) {
+		MLX5_SET(fte_match_set_lyr_2_4, spec->match_criteria, udp_dport,
+			 upspec->dport_mask);
+		MLX5_SET(fte_match_set_lyr_2_4, spec->match_value, udp_dport, upspec->dport);
+	}
+
+	if (upspec->sport) {
+		MLX5_SET(fte_match_set_lyr_2_4, spec->match_criteria, udp_dport,
+			 upspec->sport_mask);
+		MLX5_SET(fte_match_set_lyr_2_4, spec->match_value, udp_dport, upspec->sport);
+	}
+}
+
 static int setup_modify_header(struct mlx5_core_dev *mdev, u32 val, u8 dir,
 			       struct mlx5_flow_act *flow_act)
 {
@@ -654,6 +675,7 @@ static int tx_add_rule(struct mlx5e_ipsec_sa_entry *sa_entry)
 		setup_fte_addr6(spec, attrs->saddr.a6, attrs->daddr.a6);
 
 	setup_fte_no_frags(spec);
+	setup_fte_upper_proto_match(spec, &attrs->upspec);
 
 	switch (attrs->type) {
 	case XFRM_DEV_OFFLOAD_CRYPTO:
@@ -728,6 +750,7 @@ static int tx_add_policy(struct mlx5e_ipsec_pol_entry *pol_entry)
 		setup_fte_addr6(spec, attrs->saddr.a6, attrs->daddr.a6);
 
 	setup_fte_no_frags(spec);
+	setup_fte_upper_proto_match(spec, &attrs->upspec);
 
 	err = setup_modify_header(mdev, attrs->reqid, XFRM_DEV_OFFLOAD_OUT,
 				  &flow_act);