diff mbox series

hv_netvsc: Set device flags for properly indicating bonding

Message ID 1732736570-19700-1-git-send-email-longli@linuxonhyperv.com (mailing list archive)
State New
Delegated to: Netdev Maintainers
Headers show
Series hv_netvsc: Set device flags for properly indicating bonding | expand

Checks

Context Check Description
netdev/series_format warning Single patches do not need cover letters; Target tree name not specified in the subject
netdev/tree_selection success Guessed tree name to be net-next, async
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 3 this patch: 3
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers warning 1 maintainers not CCed: andrew+netdev@lunn.ch
netdev/build_clang success Errors and warnings before: 3 this patch: 3
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 4 this patch: 4
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 25 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/contest success net-next-2024-11-27--21-00 (tests: 786)

Commit Message

Long Li Nov. 27, 2024, 7:42 p.m. UTC 
From: Long Li <longli@microsoft.com>

hv_netvsc uses a subset of bonding features in that the master always
has only one active slave. But it never properly setup those flags.

Other kernel APIs (e.g those in "include/linux/netdevice.h") check for
IFF_MASTER, IFF_SLAVE and IFF_BONDING for determing if those are used
in a master/slave setup. RDMA uses those APIs extensively when looking
for master/slave devices.

Make hv_netvsc properly setup those flags.

Signed-off-by: Long Li <longli@microsoft.com>
---
 drivers/net/hyperv/netvsc_drv.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

Comments

Haiyang Zhang Nov. 27, 2024, 8:08 p.m. UTC | #1 
> -----Original Message-----
> From: longli@linuxonhyperv.com <longli@linuxonhyperv.com>
> Sent: Wednesday, November 27, 2024 2:43 PM
> To: KY Srinivasan <kys@microsoft.com>; Haiyang Zhang
> <haiyangz@microsoft.com>; Wei Liu <wei.liu@kernel.org>; Dexuan Cui
> <decui@microsoft.com>; David S. Miller <davem@davemloft.net>; Eric
> Dumazet <edumazet@google.com>; Jakub Kicinski <kuba@kernel.org>; Paolo
> Abeni <pabeni@redhat.com>; Shradha Gupta
> <shradhagupta@linux.microsoft.com>; Simon Horman <horms@kernel.org>;
> Konstantin Taranov <kotaranov@microsoft.com>; Souradeep Chakrabarti
> <schakrabarti@linux.microsoft.com>; Erick Archer
> <erick.archer@outlook.com>; linux-hyperv@vger.kernel.org;
> netdev@vger.kernel.org; linux-kernel@vger.kernel.org; linux-
> rdma@vger.kernel.org
> Cc: Long Li <longli@microsoft.com>
> Subject: [EXTERNAL] [PATCH] hv_netvsc: Set device flags for properly
> indicating bonding
> 
> From: Long Li <longli@microsoft.com>
> 
> hv_netvsc uses a subset of bonding features in that the master always
> has only one active slave. But it never properly setup those flags.
> 
> Other kernel APIs (e.g those in "include/linux/netdevice.h") check for
> IFF_MASTER, IFF_SLAVE and IFF_BONDING for determing if those are used
> in a master/slave setup. RDMA uses those APIs extensively when looking
> for master/slave devices.
> 
> Make hv_netvsc properly setup those flags.
> 
> Signed-off-by: Long Li <longli@microsoft.com>

Please add Fixes tag, Cc stable, add "net" to the subject.
Thanks.
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
diff mbox series

Patch

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index d6c4abfc3a28..2112fb74eb21 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -2204,6 +2204,10 @@  static int netvsc_vf_join(struct net_device *vf_netdev,
 		goto rx_handler_failed;
 	}
 
+	vf_netdev->priv_flags |= IFF_BONDING;
+	ndev->priv_flags |= IFF_BONDING;
+	ndev->flags |= IFF_MASTER;
+
 	ret = netdev_master_upper_dev_link(vf_netdev, ndev,
 					   NULL, NULL, NULL);
 	if (ret != 0) {
@@ -2484,7 +2488,15 @@  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->priv_flags &= ~IFF_BONDING;
+	ndev->priv_flags &= ~IFF_BONDING;
+	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);