netdev - Re: [PATCH v3 bpf-next 2/2] bpftool: Improve handling of ENOSPC on reuseport

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Date:   Mon, 15 Apr 2019 11:38:47 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Benjamin Poirier <bpoirier@...e.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Quentin Monnet <quentin.monnet@...ronome.com>,
        David Ahern <dsahern@...il.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH v3 bpf-next 2/2] bpftool: Improve handling of ENOSPC on
 reuseport_array map dumps

On Mon, 15 Apr 2019 16:15:36 +0900, Benjamin Poirier wrote:
> avoids outputting a series of
> 	value:
> 	No space left on device
> 
> The value itself is not wrong but bpf_fd_reuseport_array_lookup_elem() can
> only return it if the map was created with value_size = 8. There's nothing
> bpftool can do about it. Instead of repeating this error for every key in
> the map, print an explanatory warning and a specialized error.
> 
> example before:
> key: 00 00 00 00
> value:
> No space left on device
> key: 01 00 00 00
> value:
> No space left on device
> key: 02 00 00 00
> value:
> No space left on device
> Found 0 elements
> 
> example after:
> Warning: cannot read values from reuseport_sockarray map with value_size != 8
> key: 00 00 00 00  value: <cannot read>
> key: 01 00 00 00  value: <cannot read>
> key: 02 00 00 00  value: <cannot read>
> Found 0 elements
> 
> Signed-off-by: Benjamin Poirier <bpoirier@...e.com>

Reviewed-by: Jakub Kicinski <jakub.kicinski@...ronome.com>

Thank you!!