netdev - Re: [PATCH net v1] net: stmmac: TSO: Fix unbalanced DMA map/unmap for non-paged SKB data

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Message-ID: <20241202183425.4021d14c@kernel.org>
Date: Mon, 2 Dec 2024 18:34:25 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Furong Xu <0x1207@...il.com>
Cc: Jon Hunter <jonathanh@...dia.com>, netdev@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Alexandre Torgue <alexandre.torgue@...s.st.com>, Jose Abreu
 <joabreu@...opsys.com>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Maxime
 Coquelin <mcoquelin.stm32@...il.com>, xfr@...look.com, Suraj Jaiswal
 <quic_jsuraj@...cinc.com>, Thierry Reding <treding@...dia.com>,
 "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH net v1] net: stmmac: TSO: Fix unbalanced DMA map/unmap
 for non-paged SKB data

On Tue, 3 Dec 2024 10:03:31 +0800 Furong Xu wrote:
> I requested Jon to provide more info about "Tx DMA map failed" in previous
> reply, and he does not respond yet.

What does it mean to provide "more info" about a print statement from
the driver? Is there a Kconfig which he needs to set to get more info?
Perhaps you should provide a debug patch he can apply on his tree, that
will print info about (1) which buffer mapping failed (head or frags);
(2) what the physical address was of the buffer that couldn't be mapped.