netdev - Re: [PATCH bpf-next 1/2] ixgbe: xsk: get rid of redundant 'fallthrough'

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Date:   Fri, 22 Apr 2022 08:23:38 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Cc:     bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, netdev@...r.kernel.org,
        magnus.karlsson@...el.com, linux-next@...r.kernel.org
Subject: Re: [PATCH bpf-next 1/2] ixgbe: xsk: get rid of redundant
 'fallthrough'

Hi Maciej,

On Thu, 21 Apr 2022 15:21:25 +0200 Maciej Fijalkowski <maciej.fijalkowski@...el.com> wrote:
>
> Intel drivers translate actions returned from XDP programs to their own
> return codes that have the following mapping:
> 
> XDP_REDIRECT -> IXGBE_XDP_{REDIR,CONSUMED}
> XDP_TX -> IXGBE_XDP_{TX,CONSUMED}
> XDP_DROP -> IXGBE_XDP_CONSUMED
> XDP_ABORTED -> IXGBE_XDP_CONSUMED
> XDP_PASS -> IXGBE_XDP_PASS
> 
> Commit c7dd09fd4628 ("ixgbe, xsk: Terminate Rx side of NAPI when XSK Rx
> queue gets full") introduced new translation
> 
> XDP_REDIRECT -> IXGBE_XDP_EXIT
> 
> which is set when XSK RQ gets full and to indicate that driver should
> stop further Rx processing. This happens for unsuccessful
> xdp_do_redirect() so it is valuable to call trace_xdp_exception() for
> this case. In order to avoid IXGBE_XDP_EXIT -> IXGBE_XDP_CONSUMED
> overwrite, XDP_DROP case was moved above which in turn made the
> 'fallthrough' that is in XDP_ABORTED useless as it became the last label
> in the switch statement.
> 
> Simply drop this leftover.
> 
> Fixes: c7dd09fd4628 ("ixgbe, xsk: Terminate Rx side of NAPI when XSK Rx queue gets full")
> Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>

Reported-by ?
-- 
Cheers,
Stephen Rothwell

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