The current initialization is to something like 5 bit words, which truncates
everything to control characters on VMware.  QEMU somehow ignores the word
size.

Fix to initialize the serial port to 8N1, yielding useful output.

Signed-off-by: Avi Kivity <avi@cloudius-systems.com>

Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Start using tprintf as in drivers/pci.cc, for example, and switch to
'error' severity to disable early boot ACPI messages.

Eventually, core/debug.cc needs to be more dynamically configured but
for now it's good enough to use a standardized API and make the output
silent by default.

Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Indicate to the virtual hardware that our stack supports UDP fragmentation
offload.

This improves performance by a factor of about 3.3 (from ~20Gbps to ~66Gbps)
running the netperf UDP STREAM test.

Signed-off-by: Avi Kivity <avi@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

We reported the size of the last buffer in the packet, rather than the size
of the complete packet.

Fix to report the total size.

Signed-off-by: Avi Kivity <avi@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

With indirect descriptor, we can queue more buffers in the queue.
Indirect descriptor helps block device by making the large request does
not consume the entire ring and making the queue depth deeper. Indirect
descriptor does not help net device because it makes the queue longer so
it adds latency. The tests show that indirect descriptor makes blk
faster and there is no real measurable degradation on net. Also the
indirect will turn on only when we are short of descriptors.

This patch only enables indirect descriptor for vblk and vscsi. vnet is
not enabled.

1) vblk
Before: 340MB/s
After:  350MB/s

2) vscsi
Before: 320MB/s
After:  410MB/s

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

VIRTIO_RING_F_INDIRECT_DESC belongs to the base features bits. No need
to specify it in net driver.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Reviewed-by: Dor Laor <dor@cloudius-systems.com>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>

Helps making bsd header changes that xen includes.

Signed-off-by: Avi Kivity <avi@cloudius-systems.com>

Replace divides by variables and by the hard constants with masks and
divides by easy constants.

Improves netperf by about 1.6%.

Noted by Vlad.

Reviewed-by: Dor Laor <dor@cloudius-systems.com>
Reviewed-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>

We are under the virtio namespace, it makes no sense to repeat the
virtio prefix again in the virito_rng driver.

Change the naming from virtio::virtio_rng to virtio::rng.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

if_getinfo is shorter and more consistent all the other if_ functions
name, e.g., if_init, if_ioctl.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Rename it to txq_stats and rxq_stats which are more consistent with
struct txq and struct rxq.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

We are under virtio namespace, no need to repeat the virtio prefix.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

We are under the virtio namespace, it makes no sense to repeat the
virtio prefix again in the virito_net driver.

Change the naming from virtio::virtio_net to virtio::net.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

It's better not to indent after the namespace specifier.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Now, virtio-scsi disks use the same name as virtio-blk, e.g., vblk0,
vlbk1. If both scsi and blk are added to guest, they share the global disk
index number.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Added ifnet->if_get_if_info() method to collect the
internally gathered statistics into the standard if_data struct.

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
Reviewed-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
Reviewed-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Introducing rxq and txq structs representing the Rx and
Tx queues data correspondingly.

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
Reviewed-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

The add_buf_wait will sleep if there is not enough buf in the avail
ring.

When there is more space available, it can be woke up by wakeup_waiter.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

The name is shorter and clearer and more consistent with the name used
in virtio-scsi.

Signed-off-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Signed-off-by: Asias He <asias.hejun@gmail.com>
[ penberg: keep comments vertically aligned ]
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

bio is already signalled in all cases. No need to do it in destructor.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

It's better not to indent after the namespace specifier.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Change from blk::make_virtio_request to blk::make_request.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

We are under the virtio namespace, it makes no sense to repeat the
virtio prefix again in the virito_blk driver.

Change the naming from virtio::virtio_blk to virtio::blk.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

The check is moved to bdev_read and bdev_write.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

The check is moved to bdev_read and bdev_write.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

The check is moved to bdev_read and bdev_write.

Sigaed-off-by: Asias He <asias@cloudius-systems.com>

Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

This adds initial virtio-scsi support. We have no scsi layer in osv, in
this implementation virtio-scsi works directly with the bio layer. It
translates BIO_READ, BIO_WRITE and BIO_FLUSH to SCSI CMD.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

The lock used to protect _waiting_request_thread can go away.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>