[PATCH v3 0/8] vhost rxtx refactor and fixes

[Yuanhan Liu <yuanhan.liu@linux.intel.com>]

v3: - quite few minor changes, including using likely/unlikely
      when possible.

    - Added a new patch 8 to avoid desc dead loop chain

The first 3 patches refactor 3 major functions at vhost_rxtx.c.
It simplifies the code logic, making it more readable. OTOH, it
reduces binary code size, due to a lot of duplicate code are
removed, as well as some huge inline functions are diminished.

Patch 4 gets rid of the rte_memcpy for virtio_hdr copy, which
nearly saves 12K bytes of binary code size!

Patch 5 removes "unlikely" for VIRTIO_NET_F_MRG_RXBUF detection.

Patch 6, 7 and 8 do some sanity check for two desc fields, to make
vhost robust and be protected from malicious guest or abnormal use
cases.

---
Yuanhan Liu (8):
  vhost: refactor rte_vhost_dequeue_burst
  vhost: refactor virtio_dev_rx
  vhost: refactor virtio_dev_merge_rx
  vhost: do not use rte_memcpy for virtio_hdr copy
  vhost: don't use unlikely for VIRTIO_NET_F_MRG_RXBUF detection
  vhost: do sanity check for desc->len
  vhost: do sanity check for desc->next against with vq->size
  vhost: avoid dead loop chain.

 lib/librte_vhost/vhost_rxtx.c | 1027 ++++++++++++++++++-----------------------
 1 file changed, 453 insertions(+), 574 deletions(-)

-- 
1.9.0