netdev - [PATCH net-next v9 2/9] net: macsec: use skb_ensure_writable_head

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Date: Tue, 19 Dec 2023 16:53:26 +0200
From: "Radu Pirea (NXP OSS)" <radu-nicolae.pirea@....nxp.com>
To: sd@...asysnail.net,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	andrew@...n.ch,
	hkallweit1@...il.com,
	linux@...linux.org.uk,
	richardcochran@...il.com
Cc: linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	sebastian.tobuschat@....nxp.com,
	andrei.botila@....nxp.com,
	"Radu Pirea (NXP OSS)" <radu-nicolae.pirea@....nxp.com>
Subject: [PATCH net-next v9 2/9] net: macsec: use skb_ensure_writable_head_tail to expand the skb

Use skb_ensure_writable_head_tail to expand the skb if needed instead of
reimplementing a similar operation.

Signed-off-by: Radu Pirea (NXP OSS) <radu-nicolae.pirea@....nxp.com>
---
Changes in v9:
- patch added in v9

 drivers/net/macsec.c | 25 +++++--------------------
 1 file changed, 5 insertions(+), 20 deletions(-)

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index 9663050a852d..972bd816292a 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -604,26 +604,11 @@ static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
 		return ERR_PTR(-EINVAL);
 	}
 
-	if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
-		     skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
-		struct sk_buff *nskb = skb_copy_expand(skb,
-						       MACSEC_NEEDED_HEADROOM,
-						       MACSEC_NEEDED_TAILROOM,
-						       GFP_ATOMIC);
-		if (likely(nskb)) {
-			consume_skb(skb);
-			skb = nskb;
-		} else {
-			macsec_txsa_put(tx_sa);
-			kfree_skb(skb);
-			return ERR_PTR(-ENOMEM);
-		}
-	} else {
-		skb = skb_unshare(skb, GFP_ATOMIC);
-		if (!skb) {
-			macsec_txsa_put(tx_sa);
-			return ERR_PTR(-ENOMEM);
-		}
+	ret = skb_ensure_writable_head_tail(skb, dev);
+	if (unlikely(ret < 0)) {
+		macsec_txsa_put(tx_sa);
+		kfree_skb(skb);
+		return ERR_PTR(ret);
 	}
 
 	unprotected_len = skb->len;
-- 
2.34.1