netdev - [PATCH net-next 0/3] net: remove some skb_mac

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Message-ID: <20230321164519.1286357-1-edumazet@google.com>
Date:   Tue, 21 Mar 2023 16:45:16 +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 0/3] net: remove some skb_mac_header assumptions

Historically, we tried o maintain skb_mac_header available in most of
networking paths.

When reaching ndo_start_xmit() handlers, skb_mac_header() should always
be skb->data.

With recent additions of skb_mac_header_was_set() and 
DEBUG_NET_WARN_ON_ONCE() in skb_mac_header(), we can attempt
to remove our reliance on skb_mac_header in TX paths.

When this effort completes we will remove skb_reset_mac_header()
from __dev_queue_xmit() and replace it by
skb_unset_mac_header() on DEBUG_NET builds.

Eric Dumazet (3):
  net: do not use skb_mac_header() in qdisc_pkt_len_init()
  sch_cake: do not use skb_mac_header() in cake_overhead()
  net/sched: remove two skb_mac_header() uses

 net/core/dev.c         | 8 ++++----
 net/sched/act_mirred.c | 2 +-
 net/sched/act_mpls.c   | 2 +-
 net/sched/sch_cake.c   | 6 +++---
 4 files changed, 9 insertions(+), 9 deletions(-)

-- 
2.40.0.rc2.332.ga46443480c-goog