Public bug reported:
BugLink: https://bugs.launchpad.net/bugs/2142703
[Impact]
RSS configuration requires a valid RX indirection table. However, if the
network device reports only a single RX queue, an indirection table will
not be allocated. hv_netvsc currently does not check for this and
attempting to set the RSS hash key will hang VMs on Azure.
[Fix]
Backport the following fix:
d23564955811 ("net: hv_netvsc: reject RSS hash key programming without
RX indirection table")
[Test plan]
Build tested only; Azure will run reproducers on their side to validate
the fix.
[Where problems could occur]
This is small, self-contained and has no side effects, but will change
the behavior of the hv_netvsc module upon an invalid RSS hash key update
operation, which could cause issues related to network packet reception
for machines with multiple receive queues on Azure.
[Other info]
SF #00427202
** Affects: linux-azure (Ubuntu)
Importance: Undecided
Status: New
** Description changed:
- BugLink: https://bugs.launchpad.net/bugs/XXXXXX
+ BugLink: https://bugs.launchpad.net/bugs/2142703
[Impact]
RSS configuration requires a valid RX indirection table. However, if the
network device reports only a single RX queue, an indirection table will
not be allocated. hv_netvsc currently does not check for this and
attempting to set the RSS hash key will hang VMs on Azure.
[Fix]
Backport the following fix:
d23564955811 ("net: hv_netvsc: reject RSS hash key programming without
RX indirection table")
[Test plan]
Build tested only; Azure will run reproducers on their side to validate
the fix.
[Where problems could occur]
This is small, self-contained and has no side effects, but will change
the behavior of the hv_netvsc module upon an invalid RSS hash key update
operation, which could cause issues related to network packet reception
for machines with multiple receive queues on Azure.
[Other info]
SF #00427202
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https://bugs.launchpad.net/bugs/2142703
Title:
azure: backport "net: hv_netvsc: reject RSS hash key programming
without RX indirection table"
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