net/mlx5e: Add helper for encap_info_equal for tunnels with options

For tunnels with options, eg, geneve and vxlan with gbp, they share the
same way to compare the headers and options. Extract the code as a common
function for them.
Signed-off-by: Gavin Li <gavinl@nvidia.com>
Reviewed-by: Gavi Teitz <gavi@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Reviewed-by: Maor Dickman <maord@nvidia.com>
Acked-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.h

@@ -115,6 +115,9 @@ int mlx5e_tc_tun_parse_udp_ports(struct mlx5e_priv *priv,
 bool mlx5e_tc_tun_encap_info_equal_generic(struct mlx5e_encap_key *a,
 					   struct mlx5e_encap_key *b);
 
+bool mlx5e_tc_tun_encap_info_equal_options(struct mlx5e_encap_key *a,
+					   struct mlx5e_encap_key *b,
+					   __be16 tun_flags);
 #endif /* CONFIG_MLX5_ESWITCH */
 
 #endif //__MLX5_EN_TC_TUNNEL_H__

drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c

@@ -3,6 +3,7 @@
 
 #include <net/fib_notifier.h>
 #include <net/nexthop.h>
+#include <net/ip_tunnels.h>
 #include "tc_tun_encap.h"
 #include "en_tc.h"
 #include "tc_tun.h"
@@ -571,6 +572,37 @@ bool mlx5e_tc_tun_encap_info_equal_generic(struct mlx5e_encap_key *a,
 		a->tc_tunnel->tunnel_type == b->tc_tunnel->tunnel_type;
 }
 
+bool mlx5e_tc_tun_encap_info_equal_options(struct mlx5e_encap_key *a,
+					   struct mlx5e_encap_key *b,
+					   __be16 tun_flags)
+{
+	struct ip_tunnel_info *a_info;
+	struct ip_tunnel_info *b_info;
+	bool a_has_opts, b_has_opts;
+
+	if (!mlx5e_tc_tun_encap_info_equal_generic(a, b))
+		return false;
+
+	a_has_opts = !!(a->ip_tun_key->tun_flags & tun_flags);
+	b_has_opts = !!(b->ip_tun_key->tun_flags & tun_flags);
+
+	/* keys are equal when both don't have any options attached */
+	if (!a_has_opts && !b_has_opts)
+		return true;
+
+	if (a_has_opts != b_has_opts)
+		return false;
+
+	/* options stored in memory next to ip_tunnel_info struct */
+	a_info = container_of(a->ip_tun_key, struct ip_tunnel_info, key);
+	b_info = container_of(b->ip_tun_key, struct ip_tunnel_info, key);
+
+	return a_info->options_len == b_info->options_len &&
+	       !memcmp(ip_tunnel_info_opts(a_info),
+		       ip_tunnel_info_opts(b_info),
+		       a_info->options_len);
+}
+
 static int cmp_decap_info(struct mlx5e_decap_key *a,
 			  struct mlx5e_decap_key *b)
 {

drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_geneve.c

@@ -337,29 +337,7 @@ static int mlx5e_tc_tun_parse_geneve(struct mlx5e_priv *priv,
 static bool mlx5e_tc_tun_encap_info_equal_geneve(struct mlx5e_encap_key *a,
 						 struct mlx5e_encap_key *b)
 {
-	struct ip_tunnel_info *a_info;
-	struct ip_tunnel_info *b_info;
-	bool a_has_opts, b_has_opts;
-
-	if (!mlx5e_tc_tun_encap_info_equal_generic(a, b))
-		return false;
-
-	a_has_opts = !!(a->ip_tun_key->tun_flags & TUNNEL_GENEVE_OPT);
-	b_has_opts = !!(b->ip_tun_key->tun_flags & TUNNEL_GENEVE_OPT);
-
-	/* keys are equal when both don't have any options attached */
-	if (!a_has_opts && !b_has_opts)
-		return true;
-
-	if (a_has_opts != b_has_opts)
-		return false;
-
-	/* geneve options stored in memory next to ip_tunnel_info struct */
-	a_info = container_of(a->ip_tun_key, struct ip_tunnel_info, key);
-	b_info = container_of(b->ip_tun_key, struct ip_tunnel_info, key);
-
-	return a_info->options_len == b_info->options_len &&
-		memcmp(a_info + 1, b_info + 1, a_info->options_len) == 0;
+	return mlx5e_tc_tun_encap_info_equal_options(a, b, TUNNEL_GENEVE_OPT);
 }
 
 struct mlx5e_tc_tunnel geneve_tunnel = {