netdev - Re: [PATCH net-next 2/4] sfc: suppress MCDI errors from ARFS

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Date:   Fri, 22 Nov 2019 14:44:10 -0700
From:   David Ahern <dahern@...italocean.com>
To:     Edward Cree <ecree@...arflare.com>,
        linux-net-drivers@...arflare.com, davem@...emloft.net
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next 2/4] sfc: suppress MCDI errors from ARFS

On 11/22/19 10:57 AM, Edward Cree wrote:
> In high connection count usage, the NIC's filter table may be filled with
>  sufficiently many ARFS filters that further insertions fail.  As this
>  does not represent a correctness issue, do not log the resulting MCDI
>  errors.  Add a debug-level message under the (by default disabled)
>  rx_status category instead; and take the opportunity to do a little extra
>  expiry work.
> 
> Since there are now multiple workitems able to call __efx_filter_rfs_expire
>  on a given channel, it is possible for them to race and thus pass quotas
>  which, combined, exceed rfs_filter_count.  Thus, don't WARN_ON if we loop
>  all the way around the table with quota left over.
> 
> Signed-off-by: Edward Cree <ecree@...arflare.com>
> ---
>  drivers/net/ethernet/sfc/ef10.c |  8 ++++++--
>  drivers/net/ethernet/sfc/rx.c   | 28 ++++++++++++++++++++++++----
>  2 files changed, 30 insertions(+), 6 deletions(-)
> 

Tested-By: David Ahern <dahern@...italocean.com>