netdev - [PATCH v4 ipsec-next 1/3] xfrm: Use the XFRM_GRO to indicate a GRO call on input.

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Message-ID: <5ecd7fd867b0a90173f79dc8d6b07fd043fd20e6.1692172297.git.antony.antony@secunet.com>
Date: Wed, 16 Aug 2023 11:57:21 +0200
From: Antony Antony <antony.antony@...unet.com>
To: Steffen Klassert <steffen.klassert@...unet.com>, Herbert Xu
	<herbert@...dor.apana.org.au>
CC: Eyal Birger <eyal.birger@...il.com>, Antony Antony
	<antony.antony@...unet.com>, <devel@...ux-ipsec.org>,
	<netdev@...r.kernel.org>
Subject: [PATCH v4 ipsec-next 1/3] xfrm: Use the XFRM_GRO to indicate a GRO
 call on input.

From: Steffen Klassert <steffen.klassert@...unet.com>

This is needed to support GRO for ESP in UDP encapsulation.

Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
Co-developed-by: Antony Antony <antony.antony@...unet.com>
Signed-off-by: Antony Antony <antony.antony@...unet.com>
---
 net/ipv4/esp4_offload.c | 2 +-
 net/ipv6/esp6_offload.c | 2 +-
 net/xfrm/xfrm_input.c   | 6 ++----
 3 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/net/ipv4/esp4_offload.c b/net/ipv4/esp4_offload.c
index 3969fa805679..77bb01032667 100644
--- a/net/ipv4/esp4_offload.c
+++ b/net/ipv4/esp4_offload.c
@@ -76,7 +76,7 @@ static struct sk_buff *esp4_gro_receive(struct list_head *head,

 	/* We don't need to handle errors from xfrm_input, it does all
 	 * the error handling and frees the resources on error. */
-	xfrm_input(skb, IPPROTO_ESP, spi, -2);
+	xfrm_input(skb, IPPROTO_ESP, spi, 0);

 	return ERR_PTR(-EINPROGRESS);
 out_reset:
diff --git a/net/ipv6/esp6_offload.c b/net/ipv6/esp6_offload.c
index 75c02992c520..ee5f5abdb503 100644
--- a/net/ipv6/esp6_offload.c
+++ b/net/ipv6/esp6_offload.c
@@ -103,7 +103,7 @@ static struct sk_buff *esp6_gro_receive(struct list_head *head,

 	/* We don't need to handle errors from xfrm_input, it does all
 	 * the error handling and frees the resources on error. */
-	xfrm_input(skb, IPPROTO_ESP, spi, -2);
+	xfrm_input(skb, IPPROTO_ESP, spi, 0);

 	return ERR_PTR(-EINPROGRESS);
 out_reset:
diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 39fb91ff23d9..7d4a0bb9ca8d 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -466,7 +466,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
 	struct xfrm_offload *xo = xfrm_offload(skb);
 	struct sec_path *sp;

-	if (encap_type < 0) {
+	if (encap_type < 0 || (xo && xo->flags & XFRM_GRO)) {
 		x = xfrm_input_state(skb);

 		if (unlikely(x->km.state != XFRM_STATE_VALID)) {
@@ -489,9 +489,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
 			seq = XFRM_SKB_CB(skb)->seq.input.low;
 			goto resume;
 		}
-
-		/* encap_type < -1 indicates a GRO call. */
-		encap_type = 0;
+		/* GRO call */
 		seq = XFRM_SPI_SKB_CB(skb)->seq;

 		if (xo && (xo->flags & CRYPTO_DONE)) {
--
2.30.2