Merge branch 'vsock-virtio-collapse-receive-queue-under-memory-pressure'

Stefano Garzarella says:

====================
vsock/virtio: collapse receive queue under memory pressure

This series contains a patch (the first one) that is part of work I'm
doing to improve the tracking of memory used by AF_VSOCK sockets.
The second patch is a test for our suite that highlights the issue.

Since Brien reported an issue with his environment (based on Linux 6.12.y)
related to the work I’m doing, I extracted this patch and tried to make it
as easy as possible to backport. Brien tested it by backporting it to
6.12.y, which now contains the backport of the 059b7dbd20a6
("vsock/virtio: fix potential unbounded skb queue").

This patch primarily fixes STREAM sockets, but also partially fixes
SEQPACKET (with the exception of EOMs, which are kept in separate skbs to
avoid overcomplicating the code).

The rest of the work, I feel, is more net-next material and still needs
some work to be completed.

v1: https://lore.kernel.org/netdev/20260626134823.206676-1-sgarzare@redhat.com/
====================

Link: https://patch.msgid.link/20260708102904.50732-1-sgarzare@redhat.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>