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39c0abd7b2
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.
Reviewed by: bryanv
Approved by: gnn (mentor)
Sponsored by: Sunny Valley Networks
Differential Revision: https://reviews.freebsd.org/D17916
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| .. | ||
| balloon | ||
| block | ||
| console | ||
| mmio | ||
| network | ||
| pci | ||
| random | ||
| scsi | ||
| virtio.c | ||
| virtio.h | ||
| virtio_bus_if.m | ||
| virtio_config.h | ||
| virtio_ids.h | ||
| virtio_if.m | ||
| virtio_ring.h | ||
| virtqueue.c | ||
| virtqueue.h | ||