Hello,
DESCRIPTION
This patchset fixes old problem with hungup of both rx/tx sides and adds
test for it. This happens due to non-default SO_RCVLOWAT value and
deferred credit update in virtio/vsock. Link to previous old patchset:
https://lore.kernel.org/netdev/39b2e9fd-601b-189d-39a9-914e5574524c@xxxxxxxxxxxxxx/
Here is what happens step by step:
TEST
INITIAL CONDITIONS
1) Vsock buffer size is 128KB.
2) Maximum packet size is also 64KB as defined in header (yes it is
hardcoded, just to remind about that value).
3) SO_RCVLOWAT is default, e.g. 1 byte.
STEPS
SENDER RECEIVER
1) sends 128KB + 1 byte in a
single buffer. 128KB will
be sent, but for 1 byte
sender will wait for free
space at peer. Sender goes
to sleep.
2) reads 64KB, credit update not sent
3) sets SO_RCVLOWAT to 64KB + 1
4) poll() -> wait forever, there is
only 64KB available to read.
So in step 4) receiver also goes to sleep, waiting for enough data or
connection shutdown message from the sender. Idea to fix it is that rx
kicks tx side to continue transmission (and may be close connection)
when rx changes number of bytes to be woken up (e.g. SO_RCVLOWAT) and
this value is bigger than number of available bytes to read.
I've added small test for this, but not sure as it uses hardcoded value
for maximum packet length, this value is defined in kernel header and
used to control deferred credit update. And as this is not available to
userspace, I can't control test parameters correctly (if one day this
define will be changed - test may become useless).
Head for this patchset is:
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=18de1e517ed37ebaf33e771e46faf052e966e163
Link to v1:
https://lore.kernel.org/netdev/20231108072004.1045669-1-avkrasnov@xxxxxxxxxxxxxxxxx/
Link to v2:
https://lore.kernel.org/netdev/20231119204922.2251912-1-avkrasnov@xxxxxxxxxxxxxxxxx/
Changelog:
v1 -> v2:
* Patchset rebased and tested on new HEAD of net-next (see hash above).
* New patch is added as 0001 - it removes return from SO_RCVLOWAT set
callback in 'af_vsock.c' when transport callback is set - with that
we can set 'sk_rcvlowat' only once in 'af_vsock.c' and in future do
not copy-paste it to every transport. It was discussed in v1.
* See per-patch changelog after ---.
v2 -> v3:
* See changelog after --- in 0003 only (0001 and 0002 still same).
Arseniy Krasnov (3):
vsock: update SO_RCVLOWAT setting callback
virtio/vsock: send credit update during setting SO_RCVLOWAT
vsock/test: SO_RCVLOWAT + deferred credit update test
drivers/vhost/vsock.c | 2 +
include/linux/virtio_vsock.h | 1 +
net/vmw_vsock/af_vsock.c | 9 +-
net/vmw_vsock/virtio_transport.c | 2 +
net/vmw_vsock/virtio_transport_common.c | 28 +++++
net/vmw_vsock/vsock_loopback.c | 2 +
tools/testing/vsock/vsock_test.c | 142 ++++++++++++++++++++++++
7 files changed, 184 insertions(+), 2 deletions(-)
--
2.25.1
