[PATCH v3 0/5] Pad all inbound frames to 802.3 minimum size if needed

[Stefano Brivio <sbrivio@redhat.com>]

Patch 1/5 handles the easy non-batched case with a copy to a padded
buffer (only if needed).

Patches 2/5 and 3/5 clean coding style up before further changes.

Patch 4/5 deals with TCP and UDP batched frames in non-vhost-user modes.

Patch 5/5 is for batched frames in vhost-user mode instead.

v3:
 * in 4/5, add calls to tap_hdr_update() from UDP and TCP code to actually
   update the frame length descriptors after padding
 * refactor 5/5 entirely based on David's feedback: assume that the first
   buffer supplied by the guest is at least 60 bytes long, and introduce
   a vu_pad() common function for both TCP and UDP. Don't recalculate
   l2len in it, as all the callers already do.

v2:
  * in 1/5, calculate vnet_len *after* padding
  * in 5/5:
    - pass the right pointers to memset()
    - explicitly request at least ETH_ZLEN bytes from vu_collect()

Stefano Brivio (5):
  tap: Pad non-batched frames to 802.3 minimum (60 bytes) if needed
  tcp: Fix coding style for comment to enum tcp_iov_parts
  udp: Fix coding style for comment to enum udp_iov_idx
  tcp, udp: Pad batched frames to 60 bytes (802.3 minimum) in
    non-vhost-user modes
  tcp, udp: Pad batched frames for vhost-user modes to 60 bytes (802.3
    minimum)

 tap.c          | 11 ++++++++++-
 tcp.c          |  2 +-
 tcp_buf.c      | 23 +++++++++++++++++++++++
 tcp_internal.h |  4 +++-
 tcp_vu.c       | 17 ++++++++++++-----
 udp.c          | 43 +++++++++++++++++++++++++++++++++++--------
 udp_vu.c       |  8 ++++++--
 util.c         |  3 +++
 util.h         |  3 +++
 vu_common.c    | 14 ++++++++++++++
 vu_common.h    |  1 +
 11 files changed, 111 insertions(+), 18 deletions(-)

-- 
2.43.0