svn commit: r340461 - in stable/12/sys/dev: netmap virtio/network

[Rodney W. Grimes]

> Author: vmaffione
> Date: Thu Nov 15 18:51:37 2018
> New Revision: 340461
> URL: https://svnweb.freebsd.org/changeset/base/340461
> 
> Log:
>   MFC :r340436
>   
>   vtnet: fix netmap support
>   
>   netmap(4) support for vtnet(4) was incomplete and had multiple bugs.
>   This commit fixes those bugs to bring netmap on vtnet in a functional state.
>   
>   Changelist:
>     - handle errors returned by virtqueue_enqueue() properly (they were
>       previously ignored)
>     - make sure netmap XOR rest of the kernel access each virtqueue.
>     - compute the number of netmap slots for TX and RX separately, according to
>       whether indirect descriptors are used or not for a given virtqueue.
>     - make sure sglist are freed according to their type (mbufs or netmap
>       buffers)
>     - add support for mulitiqueue and netmap host (aka sw) rings.
>     - intercept VQ interrupts directly instead of intercepting them in txq_eof
>       and rxq_eof. This simplifies the code and makes it easier to make sure
>       taskqueues are not running for a VQ while it is in netmap mode.
>     - implement vntet_netmap_config() to cope with changes in the number of queues.
>   
>   Sponsored by:	Sunny Valley Networks
>   Differential Revision:	https://reviews.freebsd.org/D17916
>   Approved by: re (gjb)

Thank you for getting this merged early, intime for RC1.


-- 
Rod Grimes                                                 rgrimes at freebsd.org