netdev - Re: [PATCH net-next 1/3] tcp: wrap mptcp and decrypted checks into tcp_skb_can_collapse

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Message-ID: <6659d415c8aa3_3f8cab2944d@willemb.c.googlers.com.notmuch>
Date: Fri, 31 May 2024 09:43:49 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Jakub Kicinski <kuba@...nel.org>, 
 edumazet@...gle.com, 
 pabeni@...hat.com
Cc: davem@...emloft.net, 
 netdev@...r.kernel.org, 
 mptcp@...ts.linux.dev, 
 matttbe@...nel.org, 
 martineau@...nel.org, 
 borisp@...dia.com, 
 willemdebruijn.kernel@...il.com, 
 Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net-next 1/3] tcp: wrap mptcp and decrypted checks into
 tcp_skb_can_collapse_rx()

Jakub Kicinski wrote:
> tcp_skb_can_collapse() checks for conditions which don't make
> sense on input. Because of this we ended up sprinkling a few
> pairs of mptcp_skb_can_collapse() and skb_cmp_decrypted() calls
> on the input path. Group them in a new helper. This should make
> it less likely that someone will check mptcp and not decrypted
> or vice versa when adding new code.
> 
> This implicitly adds a decrypted check early in tcp_collapse().
> AFAIU this will very slightly increase our ability to collapse
> packets under memory pressure, not a real bug.
> 
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>

Reviewed-by: Willem de Bruijn <willemb@...gle.com>