History log of /vpp/src/vnet/devices/virtio/vhost_user_inline.h
Revision Date Author Comments
# bc0d9ff6 23-Mar-2020 Steven Luong <sluong@cisco.com>

virtio: support virtio 1.1 packed ring in vhost

virtio 1.1 defines a number of new features. Packed ring is among the most
notable and important one. It combines used, available, and descripptor rings
into one.

This patch provides experimental support for packed ring. To avoid
regression, when packed ring is configured for the interface, it is branched
to a separate RX and TX driver. Non packed ring should continue to perform
as it was before.

Packed ring is tested using qemu4.2 and ubuntu focal fossa (kernel 5.4.0-12)
on the guess VM which supports packed ring.

To configure VPP with packed ring, just add the optional keyword "packed"
when creating the vhost interface. To bring up the guest VM with packed ring,
add "packed=on" in the qemu launch command.

To facilitate troubleshooting, also added "verbose" option in
show vhost desc CLI to include displaying the indirect descriptors.

Known qemu reconnect issue -
If VPP is restarted, guest VMs also need to be restarted. The problem
is kernel virtio-net-pci keeps track of the previous available and used
indices. For virtio 1.0, these indices are in shared memory and qemu can
easily copy them to pass to the backend for reconnect. For virio 1.1, these
indices are no longer in shared memory. Qemu needs a new mechanism to retrieve
them and it is not currently implemented. So when the protocol reconnects,
qemu does not have the correct available and used indices to pass to the
backend. As a result, after the reconnect, virtio-net-pci is reading the TX
ring from the wrong position in the ring, not the same position which the
backend is writing. Similar problem exists also in the RX.

Type: feature

Signed-off-by: Steven Luong <sluong@cisco.com>
Change-Id: I5afc50b0bafab5a1de7a6dd10f399db3fafd144c

# 3f5594d8 03-Dec-2019 Mohsin Kazmi <sykazmi@cisco.com>

gso: remove the interface count

Type: refactor

Change-Id: I51405b9d09fb6fb03d08569369fdd4e11c647908
Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>

# 5cd987dd 15-Aug-2019 Steven Luong <sluong@cisco.com>

devices: vhost-user crashes displaying show trace for deleted interface

After the trace is collected and if the interface is then deleted, show
trace may crash for the debug image. This is due to the additional check
in pool_elt_at_index() to make sure that the block is not free.

The fix is to do the check in vhost format trace and return "interface deleted"

Type: fix

Signed-off-by: Steven Luong <sluong@cisco.com>
Change-Id: I0744f913ba6146609663443f408d784067880f93

# 4208a4ce 06-May-2019 Steven Luong <sluong@cisco.com>

devices interface tests: vhosst GSO support

Add gso option in create vhost interface to support gso and checksum

Tested with the following startup options in qemu:

Type: feature

Change-Id: I9ba1ee33677a694c4a0dfe66e745b098995902b8
Signed-off-by: Steven Luong <sluong@cisco.com>

# b0789106 24-Jan-2019 Steven Luong <sluong@cisco.com>

vhoat: potential crash in map_guest_mem using debug image

map_guest_mem may be called from worker-thread/dataplane. It has a call
to vlib_log and may crash inside vlib_log's ASSERT statement

/* make sure we are running on the main thread to avoid use in dataplane
code, for dataplane logging consider use of event-logger */
ASSERT (vlib_get_thread_index () == 0);

The fix is to convert the vlib_log call in map_guest_map to event logger

Change-Id: Iaaf6d86782aa8a18d25e0209f22dc31f04668d56
Signed-off-by: Steven Luong <sluong@cisco.com>

# 2f54c27f 02-Oct-2018 Jerome Tollet <jtollet@cisco.com>

vhost-user: add support for vlib_log API

Change-Id: I0af68f6b41d0024aa64b93a8b18e2d179bf939b0
Signed-off-by: Jerome Tollet <jtollet@cisco.com>
Signed-off-by: Damjan Marion <damarion@cisco.com>

# b192feba 30-Sep-2018 Juraj Sloboda <jsloboda@cisco.com>

vhost-user: Interface state updates

Fix inconsistencies between admin and link interface states
Admin down should imply link down:
link_up = admin_up && link_ready

Change-Id: I4d668d82d035b5d2ae508727f34f1722a0c3e677
Signed-off-by: Juraj Sloboda <jsloboda@cisco.com>

# e7cde313 26-Jun-2018 Mohsin Kazmi <sykazmi@cisco.com>

vhost: Add multi-versioning support

It also refactors the vhost code which was in one big file vhost-user.c.
Receive side code is in vhost_user_input.c and
Transmit side code is in vhost_user_output.c

Change-Id: I1b539b5008685889723e228265786a2a3e9f3a78
Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>