> Subject: [EXTERNAL] Re: [PATCH] hv_netvsc: set device master/slave flags on > bonding > > Fri, Feb 28, 2025 at 11:25:13PM +0100, [email protected] wrote: > >From: Long Li <[email protected]> > > > >Currently netvsc only sets the SLAVE flag on VF netdev when it's > >bonded. It should also set the MASTER flag on itself and clear all > >those flags when the VF is unbonded. > > I don't understand why you need this. Who looks at these flags?
The SLAVE flag is checked here: https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/ethernet/microsoft/mana/mana_en.c?h=v6.14-rc5#n3144 and is also checked in some user-mode programs. There is no code checking for MASTER currently. It is added for completeness. SLAVE doesn't make sense without a MASTER. > > > > > >Signed-off-by: Long Li <[email protected]> > >--- > > drivers/net/hyperv/netvsc_drv.c | 6 ++++++ > > 1 file changed, 6 insertions(+) > > > >diff --git a/drivers/net/hyperv/netvsc_drv.c > >b/drivers/net/hyperv/netvsc_drv.c index d6c4abfc3a28..7ac18fede2f3 > >100644 > >--- a/drivers/net/hyperv/netvsc_drv.c > >+++ b/drivers/net/hyperv/netvsc_drv.c > >@@ -2204,6 +2204,7 @@ static int netvsc_vf_join(struct net_device > *vf_netdev, > > goto rx_handler_failed; > > } > > > >+ ndev->flags |= IFF_MASTER; > > ret = netdev_master_upper_dev_link(vf_netdev, ndev, > > NULL, NULL, NULL); > > if (ret != 0) { > >@@ -2484,7 +2485,12 @@ static int netvsc_unregister_vf(struct > >net_device *vf_netdev) > > > > reinit_completion(&net_device_ctx->vf_add); > > netdev_rx_handler_unregister(vf_netdev); > >+ > >+ /* Unlink the slave device and clear flag */ > >+ vf_netdev->flags &= ~IFF_SLAVE; > >+ ndev->flags &= ~IFF_MASTER; > > netdev_upper_dev_unlink(vf_netdev, ndev); > >+ > > RCU_INIT_POINTER(net_device_ctx->vf_netdev, NULL); > > dev_put(vf_netdev); > > > >-- > >2.34.1 > > > >
