netdev - [RFC PATCH 07/13] net: dsa: tag_mtk: let DSA core deal with TX reallocation

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Message-Id: <20201017213611.2557565-8-vladimir.oltean@nxp.com>
Date:   Sun, 18 Oct 2020 00:36:05 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
        kuba@...nel.org, Christian Eggers <ceggers@...i.de>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        DENG Qingfang <dqfext@...il.com>,
        Sean Wang <sean.wang@...iatek.com>,
        John Crispin <john@...ozen.org>
Subject: [RFC PATCH 07/13] net: dsa: tag_mtk: let DSA core deal with TX reallocation

Now that we have a central TX reallocation procedure that accounts for
the tagger's needed headroom in a generic way, we can remove the
skb_cow_head call.

Cc: DENG Qingfang <dqfext@...il.com>
Cc: Sean Wang <sean.wang@...iatek.com>
Cc: John Crispin <john@...ozen.org>
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 net/dsa/tag_mtk.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/net/dsa/tag_mtk.c b/net/dsa/tag_mtk.c
index 4cdd9cf428fb..38dcdded74c0 100644
--- a/net/dsa/tag_mtk.c
+++ b/net/dsa/tag_mtk.c
@@ -34,9 +34,6 @@ static struct sk_buff *mtk_tag_xmit(struct sk_buff *skb,
 	 * table with VID.
 	 */
 	if (!skb_vlan_tagged(skb)) {
-		if (skb_cow_head(skb, MTK_HDR_LEN) < 0)
-			return NULL;
-
 		skb_push(skb, MTK_HDR_LEN);
 		memmove(skb->data, skb->data + MTK_HDR_LEN, 2 * ETH_ALEN);
 		is_vlan_skb = false;
-- 
2.25.1