netdev - Re: [PATCH net-next v6 06/11] tcp: introduce dropreasons in receive path

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Date: Mon, 19 Feb 2024 12:57:36 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: Kuniyuki Iwashima <kuniyu@...zon.com>
Cc: davem@...emloft.net, dsahern@...nel.org, edumazet@...gle.com, 
	kernelxing@...cent.com, kuba@...nel.org, netdev@...r.kernel.org, 
	pabeni@...hat.com
Subject: Re: [PATCH net-next v6 06/11] tcp: introduce dropreasons in receive path

On Mon, Feb 19, 2024 at 12:47 PM Kuniyuki Iwashima <kuniyu@...zon.com> wrote:
>
> From: Jason Xing <kerneljasonxing@...il.com>
> Date: Mon, 19 Feb 2024 11:28:33 +0800
> > From: Jason Xing <kernelxing@...cent.com>
> >
> > Soon later patches can use these relatively more accurate
> > reasons to recognise and find out the cause.
> >
> > Signed-off-by: Jason Xing <kernelxing@...cent.com>
> > --
> > v5:
> > Link: https://lore.kernel.org/netdev/3a495358-4c47-4a9f-b116-5f9c8b44e5ab@kernel.org/
> > 1. Use new name (TCP_ABORT_ON_DATA) for readability (David)
> > 2. change the title of this patch
> > ---
> >  include/net/dropreason-core.h | 15 ++++++++++++++-
> >  1 file changed, 14 insertions(+), 1 deletion(-)
> >
> > diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h
> > index 3c867384dead..402367bfa56f 100644
> > --- a/include/net/dropreason-core.h
> > +++ b/include/net/dropreason-core.h
> > @@ -30,6 +30,7 @@
> >       FN(TCP_AOFAILURE)               \
> >       FN(SOCKET_BACKLOG)              \
> >       FN(TCP_FLAGS)                   \
> > +     FN(TCP_ABORT_ON_DATA)   \
> >       FN(TCP_ZEROWINDOW)              \
> >       FN(TCP_OLD_DATA)                \
> >       FN(TCP_OVERWINDOW)              \
> > @@ -37,6 +38,7 @@
> >       FN(TCP_RFC7323_PAWS)            \
> >       FN(TCP_OLD_SEQUENCE)            \
> >       FN(TCP_INVALID_SEQUENCE)        \
> > +     FN(TCP_INVALID_ACK_SEQUENCE)    \
> >       FN(TCP_RESET)                   \
> >       FN(TCP_INVALID_SYN)             \
> >       FN(TCP_CLOSE)                   \
> > @@ -204,6 +206,11 @@ enum skb_drop_reason {
> >       SKB_DROP_REASON_SOCKET_BACKLOG,
> >       /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */
> >       SKB_DROP_REASON_TCP_FLAGS,
> > +     /**
> > +      * @SKB_DROP_REASON_TCP_ABORT_ON_DATA: abort on data, corresponding to
> > +      * LINUX_MIB_TCPABORTONDATA
> > +      */
> > +     SKB_DROP_REASON_TCP_ABORT_ON_DATA,
> >       /**
> >        * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,
> >        * see LINUX_MIB_TCPZEROWINDOWDROP
> > @@ -228,13 +235,19 @@ enum skb_drop_reason {
> >       SKB_DROP_REASON_TCP_OFOMERGE,
> >       /**
> >        * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
> > -      * LINUX_MIB_PAWSESTABREJECTED
> > +      * LINUX_MIB_PAWSESTABREJECTED, LINUX_MIB_PAWSACTIVEREJECTED
> >        */
> >       SKB_DROP_REASON_TCP_RFC7323_PAWS,
> >       /** @SKB_DROP_REASON_TCP_OLD_SEQUENCE: Old SEQ field (duplicate packet) */
> >       SKB_DROP_REASON_TCP_OLD_SEQUENCE,
> >       /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */
> >       SKB_DROP_REASON_TCP_INVALID_SEQUENCE,
> > +     /**
> > +      * @SKB_DROP_REASON_TCP_INVALID_ACK_SEQUENCE: Not acceptable ACK SEQ
> > +      * field. because of ack sequence is not in the window between snd_una
>
> nit: s/. because of/ because/

Thanks. Will update it.

>
>
> > +      * and snd_nxt
> > +      */
> > +     SKB_DROP_REASON_TCP_INVALID_ACK_SEQUENCE,
> >       /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */
> >       SKB_DROP_REASON_TCP_RESET,
> >       /**
> > --
> > 2.37.3
> >