linux-kernel - Re: [PATCH net-next] sfc: reduce the number of requested xdp ev queues

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Date:   Thu, 21 Jan 2021 16:10:59 +0000
From:   Edward Cree <ecree.xilinx@...il.com>
To:     Ivan Babrou <ivan@...udflare.com>, netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        kernel-team@...udflare.com,
        Martin Habets <habetsm.xilinx@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>
Subject: Re: [PATCH net-next] sfc: reduce the number of requested xdp ev
 queues

On 20/01/2021 21:27, Ivan Babrou wrote:
> Without this change the driver tries to allocate too many queues,
> breaching the number of available msi-x interrupts on machines
> with many logical cpus and default adapter settings:
> 
> Insufficient resources for 12 XDP event queues (24 other channels, max 32)
> 
> Which in turn triggers EINVAL on XDP processing:
> 
> sfc 0000:86:00.0 ext0: XDP TX failed (-22)
> 
> Signed-off-by: Ivan Babrou <ivan@...udflare.com>

Acked-by: Edward Cree <ecree.xilinx@...il.com>