netdev - Re: [PATCH net v2 0/2] xsk: fix underflow issues in zerocopy xmit

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Message-ID: <CAL+tcoAnB+8ZLPyWQ3XsvWTa=JO1yCKWvrKVp+2WCP=kGpfSPg@mail.gmail.com>
Date: Wed, 23 Jul 2025 07:07:27 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: anthony.l.nguyen@...el.com, przemyslaw.kitszel@...el.com, 
	andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com, 
	kuba@...nel.org, pabeni@...hat.com, bjorn@...nel.org, 
	magnus.karlsson@...el.com, maciej.fijalkowski@...el.com, 
	jonathan.lemon@...il.com, sdf@...ichev.me, ast@...nel.org, 
	daniel@...earbox.net, hawk@...nel.org, john.fastabend@...il.com, 
	mcoquelin.stm32@...il.com, alexandre.torgue@...s.st.com
Cc: linux-stm32@...md-mailman.stormreply.com, bpf@...r.kernel.org, 
	intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org, 
	Jason Xing <kernelxing@...cent.com>
Subject: Re: [PATCH net v2 0/2] xsk: fix underflow issues in zerocopy xmit

On Tue, Jul 22, 2025 at 9:51 PM Jason Xing <kerneljasonxing@...il.com> wrote:
>
> From: Jason Xing <kernelxing@...cent.com>
>
> Fix two underflow issues around {stmmac_xdp|igb}_xmit_zc().
>
> Jason Xing (2):
>   stmmac: xsk: fix underflow of budget in zerocopy mode
>   igb: xsk: solve underflow of nb_pkts in zerocopy mode

Willem has pointed out it's technically not underflow but the negative
overflow[1]. So I decided to send a V3 patch with this modified.

[1]: https://lore.kernel.org/all/687f9d4cf0b14_2aa7cc29443@willemb.c.googlers.com.notmuch/

Thanks,
Jason