netdev - [PATCH ipsec 1/3] xfrm: restore GSO for SW crypto

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Message-ID: <b5c3f4e2623d940ed51df2b79a2af4cc55b40a55.1753631391.git.sd@queasysnail.net>
Date: Mon, 28 Jul 2025 17:17:18 +0200
From: Sabrina Dubroca <sd@...asysnail.net>
To: netdev@...r.kernel.org
Cc: Sabrina Dubroca <sd@...asysnail.net>,
	Zhu Yanjun <yanjun.zhu@...ux.dev>,
	Leon Romanovsky <leonro@...dia.com>,
	Steffen Klassert <steffen.klassert@...unet.com>
Subject: [PATCH ipsec 1/3] xfrm: restore GSO for SW crypto

Commit 49431af6c4ef incorrectly assumes that the GSO path is only used
by HW offload, but it's also useful for SW crypto.

This patch re-enables GSO for SW crypto. It's not an exact revert to
preserve the other changes made to xfrm_dev_offload_ok afterwards, but
it reverts all of its effects.

Fixes: 49431af6c4ef ("xfrm: rely on XFRM offload")
Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
---
 net/xfrm/xfrm_device.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/net/xfrm/xfrm_device.c b/net/xfrm/xfrm_device.c
index d2819baea414..1f88472aaac0 100644
--- a/net/xfrm/xfrm_device.c
+++ b/net/xfrm/xfrm_device.c
@@ -415,10 +415,12 @@ bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
 	struct net_device *dev = x->xso.dev;
 	bool check_tunnel_size;
 
-	if (x->xso.type == XFRM_DEV_OFFLOAD_UNSPECIFIED)
+	if (!x->type_offload ||
+	    (x->xso.type == XFRM_DEV_OFFLOAD_UNSPECIFIED && x->encap))
 		return false;
 
-	if ((dev == xfrm_dst_path(dst)->dev) && !xdst->child->xfrm) {
+	if ((!dev || dev == xfrm_dst_path(dst)->dev) &&
+	    !xdst->child->xfrm) {
 		mtu = xfrm_state_mtu(x, xdst->child_mtu_cached);
 		if (skb->len <= mtu)
 			goto ok;
@@ -430,6 +432,9 @@ bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
 	return false;
 
 ok:
+	if (!dev)
+		return true;
+
 	check_tunnel_size = x->xso.type == XFRM_DEV_OFFLOAD_PACKET &&
 			    x->props.mode == XFRM_MODE_TUNNEL;
 	switch (x->props.family) {
-- 
2.50.0