From: Jakub Kicinski <kuba@kernel.org>
To: Jiayuan Chen <jiayuan.chen@linux.dev>
Cc: netdev@vger.kernel.org, stable@vger.kernel.org,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@kernel.org>,
Paolo Abeni <pabeni@redhat.com>, Simon Horman <horms@kernel.org>,
Kuniyuki Iwashima <kuniyu@google.com>,
Neal Cardwell <ncardwell@google.com>,
Joel Granados <joel.granados@kernel.org>,
Matthias Tafelmeier <matthias.tafelmeier@gmx.net>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH net] net: reject dev_weight products that overflow int
Date: Fri, 23 Oct 2026 12:31:02 -0700 [thread overview]
Message-ID: <20261023123102.3c30d01e@kernel.org> (raw)
In-Reply-To: <20261023114228.289161-1-jiayuan.chen@linux.dev>
On Fri, 23 Oct 2026 19:42:25 +0800 Jiayuan Chen wrote:
> proc_do_dev_weight() sets the backlog NAPI weight and the qdisc quota
> to dev_weight * dev_weight_rx_bias and dev_weight * dev_weight_tx_bias.
> The three sysctls only have a lower bound of 1, so the products can
> overflow int and end up <= 0, e.g. dev_weight=65536 and
> dev_weight_rx_bias=65536 give a backlog weight of 0.
Not sure anyone uses these, maybe we could cap them?
1k for dev weight 8 for bias?
prev parent reply other threads:[~2026-10-23 19:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-23 11:42 Jiayuan Chen
2026-10-23 11:46 ` netdev-bot+sinfo
2026-10-23 11:54 ` Matthias Tafelmeier
2026-10-23 19:31 ` Jakub Kicinski [this message]
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