nfp: flower: fixes for cmesg processing timeouts

[Simon Horman]

This is a backport request from Netronome for Ubuntu 18.04 LTS

This patch-set improves control message handling making it more robust with
respect to timeouts caused by excessively large number of messages
queued for processing in a workqueue.

The upstream commits, accepted for v4.16, are:
cf2cbadc20f5 ("nfp: flower: split and limit cmsg skb lists")
0b1a989ef5a7 ("nfp: flower: move route ack control messages out of the workqueue")

[Simon Horman (horms-netronome)]

Patch 1/2 of reference backport made against Ubuntu-4.15.0-15.16 tag of git://kernel.ubuntu.com/ubuntu/ubuntu-bionic.git

[Simon Horman (horms-netronome)]

Patch 2/2 of reference backport made against Ubuntu-4.15.0-15.16 tag of git://kernel.ubuntu.com/ubuntu/ubuntu-bionic.git

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1765379

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.