-----Original Message----- From: Simon Horman horms@kernel.org Sent: Friday, September 29, 2023 1:51 AM To: Haiyang Zhang haiyangz@microsoft.com Cc: linux-hyperv@vger.kernel.org; netdev@vger.kernel.org; Dexuan Cui decui@microsoft.com; KY Srinivasan kys@microsoft.com; Paul Rosswurm paulros@microsoft.com; olaf@aepfle.de; vkuznets vkuznets@redhat.com; davem@davemloft.net; wei.liu@kernel.org; edumazet@google.com; kuba@kernel.org; pabeni@redhat.com; leon@kernel.org; Long Li longli@microsoft.com; ssengar@linux.microsoft.com; linux-rdma@vger.kernel.org; daniel@iogearbox.net; john.fastabend@gmail.com; bpf@vger.kernel.org; ast@kernel.org; Ajay Sharma sharmaajay@microsoft.com; hawk@kernel.org; tglx@linutronix.de; shradhagupta@linux.microsoft.com; linux-kernel@vger.kernel.org; stable@vger.kernel.org Subject: Re: [PATCH net, 1/3] net: mana: Fix TX CQE error handling
On Fri, Sep 29, 2023 at 07:47:57AM +0200, Simon Horman wrote:
On Sat, Sep 23, 2023 at 06:31:45PM -0700, Haiyang Zhang wrote:
For an unknown TX CQE error type (probably from a newer hardware), still free the SKB, update the queue tail, etc., otherwise the accounting will be wrong.
Also, TX errors can be triggered by injecting corrupted packets, so replace the WARN_ONCE to ratelimited error logging, because we don't need stack trace here.
Cc: stable@vger.kernel.org Fixes: ca9c54d2d6a5 ("net: mana: Add a driver for Microsoft Azure
Network Adapter (MANA)")
Signed-off-by: Haiyang Zhang haiyangz@microsoft.com
Reviewed-by: Simon Horman horms@kernel.org
Sorry, one latent question.
The patch replaces WARN_ONCE with a net_ratelimit()'d netdev_err(). But I do wonder if, as a fix, netdev_err_once() would be more appropriate.
This error may happen with different CQE error types, so I use netdev_err() to display them, and added rate limit.
Thanks - Haiyang