netdev - [PATCH net-next 2/3] sch_cake: do not use skb_mac_header() in cake

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Date:   Tue, 21 Mar 2023 16:45:18 +0000
From:   Eric Dumazet <edumazet@...gle.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Simon Horman <simon.horman@...igine.com>, netdev@...r.kernel.org,
        eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 2/3] sch_cake: do not use skb_mac_header() in cake_overhead()

We want to remove our use of skb_mac_header() in tx paths,
eg remove skb_reset_mac_header() from __dev_queue_xmit().

Idea is that ndo_start_xmit() can get the mac header
simply looking at skb->data.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/sched/sch_cake.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/sched/sch_cake.c b/net/sched/sch_cake.c
index 7970217b565a4ebbee3797ec0e5fb5667c5be795..891e007d5c0bf972a686b892c13d647e46b3274b 100644
--- a/net/sched/sch_cake.c
+++ b/net/sched/sch_cake.c
@@ -1360,7 +1360,7 @@ static u32 cake_overhead(struct cake_sched_data *q, const struct sk_buff *skb)
 		return cake_calc_overhead(q, len, off);
 
 	/* borrowed from qdisc_pkt_len_init() */
-	hdr_len = skb_transport_header(skb) - skb_mac_header(skb);
+	hdr_len = skb_transport_offset(skb);
 
 	/* + transport layer */
 	if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 |
@@ -1368,14 +1368,14 @@ static u32 cake_overhead(struct cake_sched_data *q, const struct sk_buff *skb)
 		const struct tcphdr *th;
 		struct tcphdr _tcphdr;
 
-		th = skb_header_pointer(skb, skb_transport_offset(skb),
+		th = skb_header_pointer(skb, hdr_len,
 					sizeof(_tcphdr), &_tcphdr);
 		if (likely(th))
 			hdr_len += __tcp_hdrlen(th);
 	} else {
 		struct udphdr _udphdr;
 
-		if (skb_header_pointer(skb, skb_transport_offset(skb),
+		if (skb_header_pointer(skb, hdr_len,
 				       sizeof(_udphdr), &_udphdr))
 			hdr_len += sizeof(struct udphdr);
 	}
-- 
2.40.0.rc2.332.ga46443480c-goog