[PATCH net-next 1/3] net: gso: add HBH extension header offload support

From: Richard Gobert <richardbgobert@gmail.com>
To: davem@davemloft.net, dsahern@kernel.org, edumazet@google.com,
	kuba@kernel.org, pabeni@redhat.com, shuah@kernel.org,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-kselftest@vger.kernel.org
Subject: [PATCH net-next 1/3] net: gso: add HBH extension header offload support
Date: Thu, 21 Dec 2023 19:55:09 +0100	[thread overview]
Message-ID: <e8b01e54-b623-44ec-84d5-406ea3b0c80b@gmail.com> (raw)
In-Reply-To: <f4eff69d-3917-4c42-8c6b-d09597ac4437@gmail.com>

This commit adds net_offload to IPv6 Hop-by-Hop extension headers (as it
is done for routing and dstopts) since it is supported in GSO and GRO.
This allows to remove specific HBH conditionals in GSO and GRO when
pulling and parsing an incoming packet.

Signed-off-by: Richard Gobert <richardbgobert@gmail.com>
---
 net/ipv6/exthdrs_offload.c | 11 +++++++++++
 net/ipv6/ip6_offload.c     | 25 +++++++++++--------------
 2 files changed, 22 insertions(+), 14 deletions(-)

diff --git a/net/ipv6/exthdrs_offload.c b/net/ipv6/exthdrs_offload.c
index 06750d65d480..4c00398f4dca 100644
--- a/net/ipv6/exthdrs_offload.c
+++ b/net/ipv6/exthdrs_offload.c
@@ -16,6 +16,10 @@ static const struct net_offload dstopt_offload = {
 	.flags		=	INET6_PROTO_GSO_EXTHDR,
 };
 
+static const struct net_offload hbh_offload = {
+	.flags		=	INET6_PROTO_GSO_EXTHDR,
+};
+
 int __init ipv6_exthdrs_offload_init(void)
 {
 	int ret;
@@ -28,9 +32,16 @@ int __init ipv6_exthdrs_offload_init(void)
 	if (ret)
 		goto out_rt;
 
+	ret = inet6_add_offload(&hbh_offload, IPPROTO_HOPOPTS);
+	if (ret)
+		goto out_dstopts;
+
 out:
 	return ret;
 
+out_dstopts:
+	inet6_del_offload(&dstopt_offload, IPPROTO_DSTOPTS);
+
 out_rt:
 	inet6_del_offload(&rthdr_offload, IPPROTO_ROUTING);
 	goto out;
diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index d6314287338d..0e0b5fed0995 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -45,15 +45,13 @@ static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
 		struct ipv6_opt_hdr *opth;
 		int len;
 
-		if (proto != NEXTHDR_HOP) {
-			ops = rcu_dereference(inet6_offloads[proto]);
+		ops = rcu_dereference(inet6_offloads[proto]);
 
-			if (unlikely(!ops))
-				break;
+		if (unlikely(!ops))
+			break;
 
-			if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
-				break;
-		}
+		if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
+			break;
 
 		if (unlikely(!pskb_may_pull(skb, 8)))
 			break;
@@ -171,13 +169,12 @@ static int ipv6_exthdrs_len(struct ipv6hdr *iph,
 
 	proto = iph->nexthdr;
 	for (;;) {
-		if (proto != NEXTHDR_HOP) {
-			*opps = rcu_dereference(inet6_offloads[proto]);
-			if (unlikely(!(*opps)))
-				break;
-			if (!((*opps)->flags & INET6_PROTO_GSO_EXTHDR))
-				break;
-		}
+		*opps = rcu_dereference(inet6_offloads[proto]);
+		if (unlikely(!(*opps)))
+			break;
+		if (!((*opps)->flags & INET6_PROTO_GSO_EXTHDR))
+			break;
+
 		opth = (void *)opth + optlen;
 		optlen = ipv6_optlen(opth);
 		len += optlen;
-- 
2.36.1

