[SRU][Q/N/J:linux-azure][PATCH 0/1] azure: backport "net: hv_netvsc: reject RSS hash key programming without RX indirection table" Edit

[Vinicius Peixoto]

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

Aditya Garg (1):
  net: hv_netvsc: reject RSS hash key programming without RX indirection
    table

 drivers/net/hyperv/netvsc_drv.c | 3 +++
 1 file changed, 3 insertions(+)

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2.51.0