src: support for offload chain flag

This patch extends the basechain definition to allow users to specify
the offload flag. This flag enables hardware offload if your drivers
supports it.

 # cat file.nft
 table netdev x {
    chain y {
       type filter hook ingress device eth0 priority 10; flags offload;
    }
 }
 # nft -f file.nft

Note: You have to enable offload via ethtool:

 # ethtool -K eth0 hw-tc-offload on

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/rule.c b/src/rule.c
index 9e58ee66..8e585268 100644
--- a/src/rule.c
+++ b/src/rule.c
@@ -1177,6 +1177,9 @@ static void chain_print_declaration(const struct chain *chain,
 			nft_print(octx, " policy %s;",
 				  chain_policy2str(policy));
 		}
+		if (chain->flags & CHAIN_F_HW_OFFLOAD)
+			nft_print(octx, " flags offload;");
+
 		nft_print(octx, "\n");
 	}
 }