[PATCH 0/7] vhost-user,tcp: Handle multiple iovec entries per virtqueue element

[Laurent Vivier <lvivier@redhat.com>]

This is the TCP counterpart to the UDP multi-iov series.  It converts
the TCP vhost-user receive path from direct pointer arithmetic (via
vu_eth(), vu_ip(), etc.) to the iov_tail abstraction, removing the
assumption that all headers reside in a single contiguous buffer.

With this series applied, the TCP path correctly handles virtio-net
drivers that provide multiple buffers per virtqueue element (e.g. iPXE
provides the vnet header in the first buffer and the frame payload in a
second one), matching the support already present in the UDP path.

Based-on: 20260323143151.538673-1-lvivier@redhat.com

Laurent Vivier (7):
  tcp: pass ipv4h checksum, not a pointer to the checksum
  tcp: use iov_tail to access headers in tcp_fill_headers()
  tcp_vu: Use iov_tail helpers to build headers in tcp_vu_prepare()
  tcp_vu: Support multibuffer frames in tcp_vu_sock_recv()
  tcp: Use iov_tail to access headers in tcp_prepare_flags()
  iov: introduce iov_memcopy()
  tcp_vu: Use iov_tail helpers to build headers in tcp_vu_send_flag()

 iov.c          |  45 +++++++
 iov.h          |   2 +
 tcp.c          | 180 ++++++++++++++-----------
 tcp_buf.c      |  34 ++---
 tcp_internal.h |   9 +-
 tcp_vu.c       | 354 ++++++++++++++++++++++++++++---------------------
 vu_common.h    |  20 ---
 7 files changed, 368 insertions(+), 276 deletions(-)

-- 
2.53.0