[dpdk-dev] [PATCH v9 0/8] implement packed virtqueues
Jens Freimann
jfreimann at redhat.com
Wed Oct 24 16:32:28 CEST 2018
This is a basic implementation of packed virtqueues as specified in the
Virtio 1.1 draft. A compiled version of the current draft is available
at https://github.com/oasis-tcs/virtio-docs.git (or as .pdf at
https://github.com/oasis-tcs/virtio-docs/blob/master/virtio-v1.1-packed-wd10.pdf
A packed virtqueue is different from a split virtqueue in that it
consists of only a single descriptor ring that replaces available and
used ring, index and descriptor pointers.
Each descriptor is readable and writable and has a flags field. These flags
will mark if a descriptor is available or used. To detect new available descriptors
even after the ring has wrapped, device and driver each have a
single-bit wrap counter that is flipped from 0 to 1 and vice versa every time
the last descriptor in the ring is used/made available.
v8-v9:
* fix virtio_ring_free_chain_packed() to handle descriptors
correctly in case of out-of-order
* fix check in virtqueue_xmit_cleanup_packed() to improve performance
v7->v8:
* move desc_is_used change to correct patch
* remove trailing newline
* correct xmit code, flags update and memory barrier
* move packed desc init to dedicated function, split
and packed variant
Jens Freimann (8):
net/virtio: vring init for packed queues
net/virtio: add packed virtqueue defines
net/virtio: add packed virtqueue helpers
net/virtio: dump packed virtqueue data
net/virtio: implement transmit path for packed queues
net/virtio: implement receive path for packed queues
net/virtio: add virtio send command packed queue support
net/virtio: enable packed virtqueues by default
drivers/net/virtio/virtio_ethdev.c | 154 ++++++--
drivers/net/virtio/virtio_ethdev.h | 5 +
drivers/net/virtio/virtio_pci.h | 7 +
drivers/net/virtio/virtio_ring.h | 105 +++++-
drivers/net/virtio/virtio_rxtx.c | 560 +++++++++++++++++++++++++++--
drivers/net/virtio/virtqueue.c | 22 ++
drivers/net/virtio/virtqueue.h | 42 ++-
7 files changed, 841 insertions(+), 54 deletions(-)
--
2.17.1
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