netdev - [PATCH 04/12] xfrm: Remove unneeded device check from validate_xmit

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Message-ID: <20250523075611.3723340-5-steffen.klassert@secunet.com>
Date: Fri, 23 May 2025 09:56:03 +0200
From: Steffen Klassert <steffen.klassert@...unet.com>
To: David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>
CC: Herbert Xu <herbert@...dor.apana.org.au>, Steffen Klassert
	<steffen.klassert@...unet.com>, <netdev@...r.kernel.org>
Subject: [PATCH 04/12] xfrm: Remove unneeded device check from validate_xmit_xfrm

From: Cosmin Ratiu <cratiu@...dia.com>

validate_xmit_xfrm checks whether a packet already passed through it on
the master device (xso.dev) and skips processing the skb again on the
slave device (xso.real_dev).

This check was added in commit [1] to avoid tx packets on a bond device
pass through xfrm twice and get two sets of headers, but the check was
soon obsoleted by commit [2], which was added around the same time to
fix a similar but unrelated problem. Commit [3] set XFRM_XMIT only when
packets are hw offloaded.

xso.dev is usually equal to xso.real_dev, unless bonding is used, in
which case the bonding driver uses xso.real_dev to manage offloaded xfrm
states.

Since commit [3], the check added in commit [1] is unused on all cases,
since packets going through validate_xmit_xfrm twice bail out on the
check added in commit [2]. Here's a breakdown of relevant scenarios:

1. ESP offload off: validate_xmit_xfrm returns early on !xo.
2. ESP offload on, no bond: skb->dev == xso.real_dev == xso.dev.
3. ESP offload on, bond, xs on bond dev: 1st pass adds XFRM_XMIT, 2nd
   pass returns early on XFRM_XMIT.
3. ESP offload on, bond, xs on slave dev: 1st pass returns early on
   !xo, 2nd pass adds XFRM_XMIT.
4. ESP offload on, bond, xs on both bond AND slave dev: only 1 offload
   possible in secpath. Either 1st pass adds XFRM_XMIT and 2nd pass returns
   early on XFRM_XMIT, or 1st pass is sw and returns early on !xo.
6. ESP offload on, crypto fallback triggered in esp_xmit/esp6_xmit: 1st
   pass does sw crypto & secpath_reset, 2nd pass returns on !xo.

This commit removes the unnecessary check, so xso.real_dev becomes what
it is in practice: a private field managed by bonding driver.
The check immediately below that can be simplified as well.

[1] commit 272c2330adc9 ("xfrm: bail early on slave pass over skb")
[2] commit 94579ac3f6d0 ("xfrm: Fix double ESP trailer insertion in
IPsec crypto offload.")
[3] commit c7dbf4c08868 ("xfrm: Provide private skb extensions for
segmented and hw offloaded ESP packets")

Signed-off-by: Cosmin Ratiu <cratiu@...dia.com>
Reviewed-by: Leon Romanovsky <leonro@...dia.com>
Reviewed-by: Nikolay Aleksandrov <razor@...ckwall.org>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
---
 net/xfrm/xfrm_device.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/net/xfrm/xfrm_device.c b/net/xfrm/xfrm_device.c
index 4f4165ff738d..0be5f7ffd019 100644
--- a/net/xfrm/xfrm_device.c
+++ b/net/xfrm/xfrm_device.c
@@ -145,10 +145,6 @@ struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t featur
 		return NULL;
 	}

-	/* This skb was already validated on the upper/virtual dev */
-	if ((x->xso.dev != dev) && (x->xso.real_dev == dev))
-		return skb;
-
 	local_irq_save(flags);
 	sd = this_cpu_ptr(&softnet_data);
 	err = !skb_queue_empty(&sd->xfrm_backlog);
@@ -159,8 +155,7 @@ struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t featur
 		return skb;
 	}

-	if (skb_is_gso(skb) && (unlikely(x->xso.dev != dev) ||
-				unlikely(xmit_xfrm_check_overflow(skb)))) {
+	if (skb_is_gso(skb) && unlikely(xmit_xfrm_check_overflow(skb))) {
 		struct sk_buff *segs;

 		/* Packet got rerouted, fixup features and segment it. */
-- 
2.34.1