> -----Original Message----- > From: Li Tian <[email protected]> > Sent: Wednesday, March 25, 2026 12:50 AM > To: [email protected]; [email protected] > Cc: [email protected]; Haiyang Zhang <[email protected]>; > Wei Liu <[email protected]>; Dexuan Cui <[email protected]>; Long Li > <[email protected]>; Andrew Lunn <[email protected]>; Eric Dumazet > <[email protected]>; Vitaly Kuznetsov <[email protected]>; Paolo Abeni > <[email protected]>; Jakub Kicinski <[email protected]>; Jason Wang > <[email protected]>; Li Tian <[email protected]> > Subject: [EXTERNAL] [PATCH net] netvsc: transfer lower device max tso size > during VF transition > > 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 <[email protected]> > --- > 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)); > + } else { > netif_set_tso_max_size(ndev, netvsc_dev- > >netvsc_gso_max_size); > + } > } > > return NOTIFY_OK; Thanks.
Reviewed-by: Haiyang Zhang <[email protected]>
