linux-kernel - Re: [PATCH net] net: xilinx: axienet: Fix packet counting

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Message-ID: <096b8143-c6e5-4d64-9097-68d19ed514f3@linux.dev>
Date: Thu, 5 Sep 2024 10:40:03 -0400
From: Sean Anderson <sean.anderson@...ux.dev>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Radhey Shyam Pandey <radhey.shyam.pandey@....com>,
 "David S . Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
 netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 Michal Simek <michal.simek@....com>, Andy Chiu <andy.chiu@...ive.com>,
 Daniel Borkmann <daniel@...earbox.net>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: xilinx: axienet: Fix packet counting

On 9/4/24 20:09, Jakub Kicinski wrote:
> On Tue,  3 Sep 2024 13:56:19 -0400 Sean Anderson wrote:
>> axienet_free_tx_chain returns the number of DMA descriptors it's
>> handled. However, axienet_tx_poll treats the return as the number of
>> packets. When scatter-gather SKBs are enabled, a single packet may use
>> multiple DMA descriptors, which causes incorrect packet counts. Fix this
>> by explicitly keepting track of the number of packets processed as
>> separate from the DMA descriptors.
> 
> budget doubles up as a "are we really in NAPI" flag.
> You can't pass non-zero budget to napi_consume_skb() if not in NAPI.

Hm, maybe I should just determine this all from the "force" flag then.

--Sean