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Message-ID: <20211209184123.63117f42@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date: Thu, 9 Dec 2021 18:41:23 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Joakim Zhang <qiangqing.zhang@....com>,
Xiaoliang Yang <xiaoliang.yang_1@....com>
Cc: "davem@...emloft.net" <davem@...emloft.net>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"peppe.cavallaro@...com" <peppe.cavallaro@...com>,
"alexandre.torgue@...s.st.com" <alexandre.torgue@...s.st.com>,
"joabreu@...opsys.com" <joabreu@...opsys.com>,
Yannick Vignon <yannick.vignon@....com>,
"boon.leong.ong@...el.com" <boon.leong.ong@...el.com>,
"Jose.Abreu@...opsys.com" <Jose.Abreu@...opsys.com>,
"mst@...hat.com" <mst@...hat.com>,
"sonic.zhang@...log.com" <sonic.zhang@...log.com>,
"Joao.Pinto@...opsys.com" <Joao.Pinto@...opsys.com>,
Mingkai Hu <mingkai.hu@....com>, Leo Li <leoyang.li@....com>
Subject: Re: [PATCH net-next] net: stmmac: bump tc when get underflow error
from DMA descriptor
On Thu, 9 Dec 2021 01:31:52 +0000 Joakim Zhang wrote:
> > net: stmmac: bump tc when get underflow error from DMA descriptor
> >
> > In DMA threshold mode, frame underflow errors may sometimes occur
> > when the TC(threshold control) value is not enough. The TC value need to be
> > bumped up in this case.
> >
> > There is no underflow interrupt bit on DMA_CH(#i)_Status of dwmac4, so
> > the DMA threshold cannot be bumped up in stmmac_dma_interrupt(). The
> > i.mx8mp board observed an underflow error while running NFS boot, the
> > NFS rootfs could not be mounted.
> >
> > The underflow error can be got from the DMA descriptor TDES3 on dwmac4.
> > This patch bump up tc value once underflow error is got from TDES3.
> >
> > Signed-off-by: Xiaoliang Yang <xiaoliang.yang_1@....com>
>
> 5 queues with FIFO cut-through mode can work well after applying this patch.
This never worked, correct? It's not a regression fix?
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