[PATCH 0/6] virtio: support extra per-buffer context

[Michael S. Tsirkin]

virtio net is resorting to hacks in order to fit all per-buffer info in a
single 64 bit value. But in fact we have some unused memory there - normally
used for indirect descriptors - that we can utilize without slowing everyone
down.

Add APIs to do exactly that, and use them to simplify mergeable
buffer handling code.

This will also easily enable switching XDP mode on/off without doing device
resets (leading to packet drops), and more optimizations.

Michael S. Tsirkin (6):
  virtio: wrap find_vqs
  virtio: add context flag to find vqs
  virtio: allow extra context per descriptor
  virtio_net: allow specifying context for rx
  virtio_net: rework mergeable buffer handling
  virtio_net: reduce alignment for buffers

 drivers/block/virtio_blk.c                 |   3 +-
 drivers/char/virtio_console.c              |   6 +-
 drivers/crypto/virtio/virtio_crypto_core.c |   3 +-
 drivers/gpu/drm/virtio/virtgpu_kms.c       |   3 +-
 drivers/misc/mic/vop/vop_main.c            |   9 ++-
 drivers/net/caif/caif_virtio.c             |   3 +-
 drivers/net/virtio_net.c                   | 116 ++++++++++++++---------------
 drivers/rpmsg/virtio_rpmsg_bus.c           |   2 +-
 drivers/s390/virtio/kvm_virtio.c           |   6 +-
 drivers/s390/virtio/virtio_ccw.c           |   7 +-
 drivers/scsi/virtio_scsi.c                 |   3 +-
 drivers/virtio/virtio_balloon.c            |   3 +-
 drivers/virtio/virtio_input.c              |   3 +-
 drivers/virtio/virtio_mmio.c               |   8 +-
 drivers/virtio/virtio_pci_common.c         |  18 +++--
 drivers/virtio/virtio_pci_common.h         |   4 +-
 drivers/virtio/virtio_pci_legacy.c         |   4 +-
 drivers/virtio/virtio_pci_modern.c         |  12 ++-
 drivers/virtio/virtio_ring.c               |  77 +++++++++++++++----
 include/linux/virtio.h                     |   9 +++
 include/linux/virtio_config.h              |  25 ++++++-
 include/linux/virtio_ring.h                |   3 +
 net/vmw_vsock/virtio_transport.c           |   6 +-
 23 files changed, 212 insertions(+), 121 deletions(-)

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MST