linux-kernel - Re: [PATCH net 2/4] net: ti: icssg-prueth: Report BQL before sending XDP packets

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Message-ID: <20250501075357.37f2dc4f@kernel.org>
Date: Thu, 1 May 2025 07:53:57 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Meghana Malladi <m-malladi@...com>
Cc: <dan.carpenter@...aro.org>, <john.fastabend@...il.com>,
 <hawk@...nel.org>, <daniel@...earbox.net>, <ast@...nel.org>,
 <pabeni@...hat.com>, <edumazet@...gle.com>, <davem@...emloft.net>,
 <andrew+netdev@...n.ch>, <bpf@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
 <linux-arm-kernel@...ts.infradead.org>, <srk@...com>, Vignesh Raghavendra
 <vigneshr@...com>, Roger Quadros <rogerq@...nel.org>, <danishanwar@...com>
Subject: Re: [PATCH net 2/4] net: ti: icssg-prueth: Report BQL before
 sending XDP packets

On Mon, 28 Apr 2025 17:34:57 +0530 Meghana Malladi wrote:
> When sending out any kind of traffic, it is essential that the driver
> keeps reporting BQL of the number of bytes that have been sent so that
> BQL can track the amount of data in the queue and prevents it from
> overflowing. If BQL is not reported, the driver may continue sending
> packets even when the queue is full, leading to packet loss, congestion
> and decreased network performance. Currently this is missing in
> emac_xmit_xdp_frame() and this patch fixes it.

The ordering of patches in the series is a bit off.
The order should be something like:

  net: ti: icssg-prueth: Set XDP feature flags for ndev
  net: ti: icssg-prueth: Fix kernel panic during concurrent Tx queue ...
  net: ti: icssg-prueth: Fix race condition for traffic from different ...
  net: ti: icssg-prueth: Report BQL before sending XDP packets

This patch is not correct without the extra locking in place.