diff mbox series

[S11,10/16] ice: don't spam VFs with link messages

Message ID 20190208205043.11975-11-anirudh.venkataramanan@intel.com
State Accepted
Delegated to: Jeff Kirsher
Headers show
Series Bug fixes for ice | expand

Commit Message

Anirudh Venkataramanan Feb. 8, 2019, 8:50 p.m. UTC 
From: Mitch Williams <mitch.a.williams@intel.com>

Don't send a link message to the VFs unless link actually changes state.
This avoids a small timing hole in some VF drivers that can cause an
apparent TX hang if they receive a link status message at the wrong time.

Although we have fixed the timing hole in the current VF driver, there
are still lots of drivers in the field that have this timing hole. Let's
not fall into it if we can avoid it.

Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Comments

Bowers, AndrewX Feb. 15, 2019, midnight UTC | #1 
> -----Original Message-----
> From: Intel-wired-lan [mailto:intel-wired-lan-bounces@osuosl.org] On
> Behalf Of Anirudh Venkataramanan
> Sent: Friday, February 8, 2019 12:51 PM
> To: intel-wired-lan@lists.osuosl.org
> Subject: [Intel-wired-lan] [PATCH S11 10/16] ice: don't spam VFs with link
> messages
> 
> From: Mitch Williams <mitch.a.williams@intel.com>
> 
> Don't send a link message to the VFs unless link actually changes state.
> This avoids a small timing hole in some VF drivers that can cause an apparent
> TX hang if they receive a link status message at the wrong time.
> 
> Although we have fixed the timing hole in the current VF driver, there are
> still lots of drivers in the field that have this timing hole. Let's not fall into it if
> we can avoid it.
> 
> Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
> Signed-off-by: Anirudh Venkataramanan
> <anirudh.venkataramanan@intel.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_main.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
diff mbox series

Patch

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index fb04a5ebdc0b..47cc3f905b7f 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -609,7 +609,8 @@  ice_link_event(struct ice_pf *pf, struct ice_port_info *pi)
 		}
 	}
 
-	ice_vc_notify_link_state(pf);
+	if (!new_link_same_as_old && pf->num_alloc_vfs)
+		ice_vc_notify_link_state(pf);
 
 	return 0;
 }