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; -- 2.53.0
