Regression in hyperv network driver in 3.14

[Bernhard Walle]

Hello,

using a 3.14 kernel in a Linux VM running on HyperV (Windows Server 2008
R2) we get following error:

   hv_netvsc: hv_netvsc channel opened successfully
   hv_netvsc vmbus_0_9 (unregistered net_device): Unable to complete receive buffer initialization with NetVsp - status 2
   hv_netvsc vmbus_0_9 (unregistered net_device): unable to connect to NetVSP - -22
   hv_netvsc vmbus_0_9 (unregistered net_device): unable to add netvsc device (ret -22)
   hv_netvsc: probe of vmbus_0_9 failed with error -22

Bisecting the problem shows that commit
b679ef73edc251f6d200a7dd2396e9fef9e36fc3 is responsible. Reverting it
fixes the issue. Even only changing NETVSC_RECEIVE_BUFFER_SIZE to 2M
fixes the issue!

The virtual machine has 2 GiB of memory and 4 CPUs.

Can I provide more information to track down the problem?


Regards,
Bernhard

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