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[91.219.240.17]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-487116d820bsm113568205e9.10.2026.03.25.02.47.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Mar 2026 02:47:45 -0700 (PDT) From: Vitaly Kuznetsov To: Li Tian , netdev@vger.kernel.org, linux-hyperv@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li , Andrew Lunn , Eric Dumazet , Paolo Abeni , Jakub Kicinski , Jason Wang , Li Tian Subject: Re: [PATCH net] netvsc: transfer lower device max tso size during VF transition In-Reply-To: <20260325045006.18607-1-litian@redhat.com> References: <20260325045006.18607-1-litian@redhat.com> Date: Wed, 25 Mar 2026 10:47:44 +0100 Message-ID: <87a4vwnsu7.fsf@redhat.com> Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain Li Tian writes: > When netvsc is accelerated by the lower device, we can advertise the > lower device max tso size in order to get better performance. > While a long-term migration to user-space bonding is planned, current > users on RHEL 10 / Azure are experiencing significant performance > regressions in 802.3ad environments. This patch provides a localized, > safe fix within netvsc without introducing new core networking helpers. > > Signed-off-by: Li Tian > --- > drivers/net/hyperv/netvsc_drv.c | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c > index ee5ab5ceb2be..971607c7406f 100644 > --- a/drivers/net/hyperv/netvsc_drv.c > +++ b/drivers/net/hyperv/netvsc_drv.c > @@ -2428,10 +2428,14 @@ static int netvsc_vf_changed(struct net_device *vf_netdev, unsigned long event) > * This value is only increased for netvsc NIC when datapath is > * switched over to the VF > */ > - if (vf_is_up) > + if (vf_is_up) { > netif_set_tso_max_size(ndev, vf_netdev->tso_max_size); > - else > + WRITE_ONCE(ndev->gso_max_size, READ_ONCE(vf_netdev->gso_max_size)); > + WRITE_ONCE(ndev->gso_ipv4_max_size, > + READ_ONCE(vf_netdev->gso_ipv4_max_size)); It seems netif_set_gso_max_size() helper does exactly that, i.e. sets both gso_max_size and gso_ipv4_max_size. > + } else { > netif_set_tso_max_size(ndev, netvsc_dev->netvsc_gso_max_size); > + } > } > > return NOTIFY_OK; -- Vitaly