ce2eabdd43
Add a new virtual device named virtio-user, which can be used just like eth_ring, eth_null, etc. To reuse the code of original virtio, we do some adjustment in virtio_ethdev.c, such as remove key _static_ of eth_virtio_dev_init() so that it can be reused in virtual device; and we add some check to make sure it will not crash. Configured parameters include: - queues (optional, 1 by default), number of queue pairs, multi-queue not supported for now. - cq (optional, 0 by default), not supported for now. - mac (optional), random value will be given if not specified. - queue_size (optional, 256 by default), size of virtqueues. - path (madatory), path of vhost user. When enable CONFIG_RTE_VIRTIO_USER (enabled by default), the compiled library can be used in both VM and container environment. Examples: path_vhost=<path_to_vhost_user> # use vhost-user as a backend sudo ./examples/l2fwd/build/l2fwd -c 0x100000 -n 4 \ --socket-mem 0,1024 --no-pci --file-prefix=l2fwd \ --vdev=virtio-user0,mac=00:01:02:03:04:05,path=$path_vhost -- -p 0x1 Known issues: - Control queue and multi-queue are not supported yet. - Cannot work with --huge-unlink. - Cannot work with no-huge. - Cannot work when there are more than VHOST_MEMORY_MAX_NREGIONS(8) hugepages. - Root privilege is a must (mainly becase of sorting hugepages according to physical address). - Applications should not use file name like HUGEFILE_FMT ("%smap_%d"). - Cannot work with vhost-net backend. Signed-off-by: Huawei Xie <huawei.xie@intel.com> Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Acked-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> |
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