netdev - Re: bpf-next/net-next: panic using bpf_xdp_adjust

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Message-ID: <0ee9e514-9008-6b30-9665-38607169146d@gmail.com>
Date:   Tue, 26 May 2020 18:31:14 -0600
From:   David Ahern <dsahern@...il.com>
To:     Saeed Mahameed <saeedm@...lanox.com>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "brouer@...hat.com" <brouer@...hat.com>
Subject: Re: bpf-next/net-next: panic using bpf_xdp_adjust_head

On 5/26/20 3:23 PM, Saeed Mahameed wrote:
> Anyway I can't figure out the reason for this without extra digging
> since in mlx5 we do xdp_set_data_meta_invalid(); before passing the xdp
> buff to the bpf program, so it is not clear why would you hit the
> memove in bpf_xdp_adjust_head().

I commented out the metalen check in bpf_xdp_adjust_head to move on.

There are number of changes in the mlx5 driver related to xdp_buff setup
and running the programs, so it is the likely candidate. Let me know if
you have something to test.

Thanks