netdev - Re: [PATCH net-next] efx: convert to new udp

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Date:   Fri, 17 Jul 2020 18:34:59 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-net-drivers@...arflare.com,
        ecree@...arflare.com, mhabets@...arflare.com,
        mslattery@...arflare.com
Subject: Re: [PATCH net-next] efx: convert to new udp_tunnel infrastructure

From: Jakub Kicinski <kuba@...nel.org>
Date: Fri, 17 Jul 2020 16:53:36 -0700

> Check MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_TRUSTED, before setting
> the info, which will hopefully protect us from -EPERM errors
> the previous code was gracefully ignoring. Shared code reports
> the port information back to user space, so we really want
> to know what was added and what failed.
> 
> The driver does not call udp_tunnel_get_rx_info(), so its own
> management of table state is not really all that problematic,
> we can leave it be. This allows the driver to continue with its
> copious table syncing, and matching the ports to TX frames,
> which it will reportedly do one day.
> 
> Leave the feature checking in the callbacks, as the device may
> remove the capabilities on reset.
> 
> Inline the loop from __efx_ef10_udp_tnl_lookup_port() into
> efx_ef10_udp_tnl_has_port(), since it's the only caller now.
> 
> With new infra this driver gains port replace - when space frees
> up in a full table a new port will be selected for offload.
> Plus efx will no longer sleep in an atomic context.
> 
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>

Edward et al., please review.

Thank you.