From: Jakub Kicinski <kuba@kernel.org>
To: Erni Sri Satya Vennela <ernis@linux.microsoft.com>
Cc: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org,
decui@microsoft.com, longli@microsoft.com, andrew+netdev@lunn.ch,
davem@davemloft.net, edumazet@google.com, pabeni@redhat.com,
kotaranov@microsoft.com, horms@kernel.org,
dipayanroy@linux.microsoft.com, kees@kernel.org,
linux-hyperv@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org
Subject: Re: [PATCH net-next] net: mana: Cache MANA_QUERY_LINK_CONFIG result to avoid repeated HWC queries
Date: Tue, 2 Jun 2026 13:21:27 -0700 [thread overview]
Message-ID: <20260602132127.25fc27ee@kernel.org> (raw)
In-Reply-To: <20260528180757.1536640-1-ernis@linux.microsoft.com>
On Thu, 28 May 2026 11:07:51 -0700 Erni Sri Satya Vennela wrote:
> mana_query_link_cfg() sends an HWC command to firmware on every call,
> but the link speed and QoS values it returns only change when the
> driver explicitly calls mana_set_bw_clamp(). This function is called
> not only by userspace via ethtool get_link_ksettings, but also
> periodically by hv_netvsc through netvsc_get_link_ksettings and by
> the sysfs speed_show attribute via dev_attr_show, resulting in
> unnecessary HWC traffic every few minutes.
mana is ops-locked, right? Because you support net shapers
Could you instead take the netdev_lock() in the work?
It's already held around the user space originated calls.
prev parent reply other threads:[~2026-06-02 20:21 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-28 18:07 [PATCH net-next] net: mana: Cache MANA_QUERY_LINK_CONFIG result to avoid repeated HWC queries Erni Sri Satya Vennela
2026-05-29 23:14 ` Jacob Keller
2026-06-02 20:21 ` Jakub Kicinski [this message]
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