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virtio, vhost, pc fixes for 2.4

Browse Source 
The only notable thing here is vhost-user multiqueue
 revert. We'll work on making it stable in 2.5,
 reverting now means we won't have to maintain
 bug for bug compability forever.
 
 Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

virtio, vhost, pc fixes for 2.4

The only notable thing here is vhost-user multiqueue
revert. We'll work on making it stable in 2.5,
reverting now means we won't have to maintain
bug for bug compability forever.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

# gpg: Signature made Mon Jul 20 12:24:00 2015 BST using RSA key ID D28D5469
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>"
# gpg:                 aka "Michael S. Tsirkin <mst@redhat.com>"

* remotes/mst/tags/for_upstream:
  virtio-net: remove virtio queues if the guest doesn't support multiqueue
  virtio-net: Flush incoming queues when DRIVER_OK is being set
  pci_add_capability: remove duplicate comments
  virtio-net: unbreak any layout
  Revert "vhost-user: add multi queue support"
  ich9: fix skipped vmstate_memhp_state subsection

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2015-07-20 13:25:28 +01:00
commit f73ca73634
10 changed files with 138 additions and 90 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
docs/specs/vhost-user.txt
View File

@ -127,11 +127,6 @@ in the ancillary data:
If Master is unable to send the full message or receives a wrong reply it will
close the connection. An optional reconnection mechanism can be implemented.
Multi queue support
-------------------
The protocol supports multiple queues by setting all index fields in the sent
messages to a properly calculated value.
Message types
-------------

3
hw/acpi/ich9.c
View File

@ -206,9 +206,6 @@ const VMStateDescription vmstate_ich9_pm = {
},
.subsections = (const VMStateDescription*[]) {
&vmstate_memhp_state,
NULL
},
.subsections = (const VMStateDescription*[]) {
&vmstate_tco_io_state,
NULL
}

3
hw/net/vhost_net.c
View File

@ -160,7 +160,6 @@ struct vhost_net *vhost_net_init(VhostNetOptions *options)
net->dev.nvqs = 2;
net->dev.vqs = net->vqs;
net->dev.vq_index = net->nc->queue_index;
r = vhost_dev_init(&net->dev, options->opaque,
options->backend_type);
@ -287,7 +286,7 @@ static void vhost_net_stop_one(struct vhost_net *net,
for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
const VhostOps *vhost_ops = net->dev.vhost_ops;
int r = vhost_ops->vhost_call(&net->dev, VHOST_RESET_OWNER,
&file);
NULL);
assert(r >= 0);
}
}

143
hw/net/virtio-net.c
View File

@ -162,6 +162,8 @@ static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
virtio_net_vhost_status(n, status);
for (i = 0; i < n->max_queues; i++) {
NetClientState *ncs = qemu_get_subqueue(n->nic, i);
bool queue_started;
q = &n->vqs[i];
if ((!n->multiqueue && i != 0) || i >= n->curr_queues) {
@ -169,12 +171,18 @@ static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
} else {
queue_status = status;
}
queue_started =
virtio_net_started(n, queue_status) && !n->vhost_started;
if (queue_started) {
qemu_flush_queued_packets(ncs);
}
if (!q->tx_waiting) {
continue;
}
if (virtio_net_started(n, queue_status) && !n->vhost_started) {
if (queue_started) {
if (q->tx_timer) {
timer_mod(q->tx_timer,
qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
@ -1142,7 +1150,8 @@ static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
ssize_t ret, len;
unsigned int out_num = elem.out_num;
struct iovec *out_sg = &elem.out_sg[0];
struct iovec sg[VIRTQUEUE_MAX_SIZE];
struct iovec sg[VIRTQUEUE_MAX_SIZE], sg2[VIRTQUEUE_MAX_SIZE + 1];
struct virtio_net_hdr_mrg_rxbuf mhdr;
if (out_num < 1) {
error_report("virtio-net header not in first element");
@ -1150,13 +1159,25 @@ static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
}
if (n->has_vnet_hdr) {
if (out_sg[0].iov_len < n->guest_hdr_len) {
if (iov_to_buf(out_sg, out_num, 0, &mhdr, n->guest_hdr_len) <
n->guest_hdr_len) {
error_report("virtio-net header incorrect");
exit(1);
}
virtio_net_hdr_swap(vdev, (void *) out_sg[0].iov_base);
if (virtio_needs_swap(vdev)) {
virtio_net_hdr_swap(vdev, (void *) &mhdr);
sg2[0].iov_base = &mhdr;
sg2[0].iov_len = n->guest_hdr_len;
out_num = iov_copy(&sg2[1], ARRAY_SIZE(sg2) - 1,
out_sg, out_num,
n->guest_hdr_len, -1);
if (out_num == VIRTQUEUE_MAX_SIZE) {
goto drop;
}
out_num += 1;
out_sg = sg2;
}
}
/*
* If host wants to see the guest header as is, we can
* pass it on unchanged. Otherwise, copy just the parts
@ -1186,7 +1207,7 @@ static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
}
len += ret;
drop:
virtqueue_push(q->tx_vq, &elem, 0);
virtio_notify(vdev, q->tx_vq);
@ -1306,9 +1327,86 @@ static void virtio_net_tx_bh(void *opaque)
}
}
static void virtio_net_add_queue(VirtIONet *n, int index)
{
VirtIODevice *vdev = VIRTIO_DEVICE(n);
n->vqs[index].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx);
if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) {
n->vqs[index].tx_vq =
virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer);
n->vqs[index].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
virtio_net_tx_timer,
&n->vqs[index]);
} else {
n->vqs[index].tx_vq =
virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh);
n->vqs[index].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[index]);
}
n->vqs[index].tx_waiting = 0;
n->vqs[index].n = n;
}
static void virtio_net_del_queue(VirtIONet *n, int index)
{
VirtIODevice *vdev = VIRTIO_DEVICE(n);
VirtIONetQueue *q = &n->vqs[index];
NetClientState *nc = qemu_get_subqueue(n->nic, index);
qemu_purge_queued_packets(nc);
virtio_del_queue(vdev, index * 2);
if (q->tx_timer) {
timer_del(q->tx_timer);
timer_free(q->tx_timer);
} else {
qemu_bh_delete(q->tx_bh);
}
virtio_del_queue(vdev, index * 2 + 1);
}
static void virtio_net_change_num_queues(VirtIONet *n, int new_max_queues)
{
VirtIODevice *vdev = VIRTIO_DEVICE(n);
int old_num_queues = virtio_get_num_queues(vdev);
int new_num_queues = new_max_queues * 2 + 1;
int i;
assert(old_num_queues >= 3);
assert(old_num_queues % 2 == 1);
if (old_num_queues == new_num_queues) {
return;
}
/*
* We always need to remove and add ctrl vq if
* old_num_queues != new_num_queues. Remove ctrl_vq first,
* and then we only enter one of the following too loops.
*/
virtio_del_queue(vdev, old_num_queues - 1);
for (i = new_num_queues - 1; i < old_num_queues - 1; i += 2) {
/* new_num_queues < old_num_queues */
virtio_net_del_queue(n, i / 2);
}
for (i = old_num_queues - 1; i < new_num_queues - 1; i += 2) {
/* new_num_queues > old_num_queues */
virtio_net_add_queue(n, i / 2);
}
/* add ctrl_vq last */
n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
}
static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue)
{
int max = multiqueue ? n->max_queues : 1;
n->multiqueue = multiqueue;
virtio_net_change_num_queues(n, max);
virtio_net_set_queues(n);
}
@ -1583,21 +1681,7 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
}
for (i = 0; i < n->max_queues; i++) {
n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx);
if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) {
n->vqs[i].tx_vq =
virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer);
n->vqs[i].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
virtio_net_tx_timer,
&n->vqs[i]);
} else {
n->vqs[i].tx_vq =
virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh);
n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]);
}
n->vqs[i].tx_waiting = 0;
n->vqs[i].n = n;
virtio_net_add_queue(n, i);
}
n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
@ -1651,7 +1735,7 @@ static void virtio_net_device_unrealize(DeviceState *dev, Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VirtIONet *n = VIRTIO_NET(dev);
int i;
int i, max_queues;
/* This will stop vhost backend if appropriate. */
virtio_net_set_status(vdev, 0);
@ -1666,18 +1750,9 @@ static void virtio_net_device_unrealize(DeviceState *dev, Error **errp)
g_free(n->mac_table.macs);
g_free(n->vlans);
for (i = 0; i < n->max_queues; i++) {
VirtIONetQueue *q = &n->vqs[i];
NetClientState *nc = qemu_get_subqueue(n->nic, i);
qemu_purge_queued_packets(nc);
if (q->tx_timer) {
timer_del(q->tx_timer);
timer_free(q->tx_timer);
} else if (q->tx_bh) {
qemu_bh_delete(q->tx_bh);
}
max_queues = n->multiqueue ? n->max_queues : 1;
for (i = 0; i < max_queues; i++) {
virtio_net_del_queue(n, i);
}
timer_del(n->announce_timer);

6
hw/pci/pci.c
View File

@ -2101,12 +2101,10 @@ static void pci_del_option_rom(PCIDevice *pdev)
}
/*
* if !offset
* Reserve space and add capability to the linked list in pci config space
*
* if offset = 0,
* Find and reserve space and add capability to the linked list
* in pci config space */
* in pci config space
*/
int pci_add_capability(PCIDevice *pdev, uint8_t cap_id,
uint8_t offset, uint8_t size)
{

11
hw/virtio/vhost-user.c
View File

@ -210,12 +210,7 @@ static int vhost_user_call(struct vhost_dev *dev, unsigned long int request,
break;
case VHOST_SET_OWNER:
break;
case VHOST_RESET_OWNER:
memcpy(&msg.state, arg, sizeof(struct vhost_vring_state));
msg.state.index += dev->vq_index;
msg.size = sizeof(m.state);
break;
case VHOST_SET_MEM_TABLE:
@ -258,20 +253,17 @@ static int vhost_user_call(struct vhost_dev *dev, unsigned long int request,
case VHOST_SET_VRING_NUM:
case VHOST_SET_VRING_BASE:
memcpy(&msg.state, arg, sizeof(struct vhost_vring_state));
msg.state.index += dev->vq_index;
msg.size = sizeof(m.state);
break;
case VHOST_GET_VRING_BASE:
memcpy(&msg.state, arg, sizeof(struct vhost_vring_state));
msg.state.index += dev->vq_index;
msg.size = sizeof(m.state);
need_reply = 1;
break;
case VHOST_SET_VRING_ADDR:
memcpy(&msg.addr, arg, sizeof(struct vhost_vring_addr));
msg.addr.index += dev->vq_index;
msg.size = sizeof(m.addr);
break;
@ -279,7 +271,7 @@ static int vhost_user_call(struct vhost_dev *dev, unsigned long int request,
case VHOST_SET_VRING_CALL:
case VHOST_SET_VRING_ERR:
file = arg;
msg.u64 = (file->index + dev->vq_index) & VHOST_USER_VRING_IDX_MASK;
msg.u64 = file->index & VHOST_USER_VRING_IDX_MASK;
msg.size = sizeof(m.u64);
if (ioeventfd_enabled() && file->fd > 0) {
fds[fd_num++] = file->fd;
@ -321,7 +313,6 @@ static int vhost_user_call(struct vhost_dev *dev, unsigned long int request,
error_report("Received bad msg size.");
return -1;
}
msg.state.index -= dev->vq_index;
memcpy(arg, &msg.state, sizeof(struct vhost_vring_state));
break;
default:

9
include/hw/virtio/virtio-access.h
View File

@ -143,6 +143,15 @@ static inline uint64_t virtio_ldq_p(VirtIODevice *vdev, const void *ptr)
}
}
static inline bool virtio_needs_swap(VirtIODevice *vdev)
{
#ifdef HOST_WORDS_BIGENDIAN
return virtio_access_is_big_endian(vdev) ? false : true;
#else
return virtio_access_is_big_endian(vdev) ? true : false;
#endif
}
static inline uint16_t virtio_tswap16(VirtIODevice *vdev, uint16_t s)
{
#ifdef HOST_WORDS_BIGENDIAN

25
net/vhost-user.c
View File

@ -120,39 +120,35 @@ static void net_vhost_user_event(void *opaque, int event)
case CHR_EVENT_OPENED:
vhost_user_start(s);
net_vhost_link_down(s, false);
error_report("chardev \"%s\" went up", s->nc.info_str);
error_report("chardev \"%s\" went up", s->chr->label);
break;
case CHR_EVENT_CLOSED:
net_vhost_link_down(s, true);
vhost_user_stop(s);
error_report("chardev \"%s\" went down", s->nc.info_str);
error_report("chardev \"%s\" went down", s->chr->label);
break;
}
}
static int net_vhost_user_init(NetClientState *peer, const char *device,
const char *name, CharDriverState *chr,
uint32_t queues)
const char *name, CharDriverState *chr)
{
NetClientState *nc;
VhostUserState *s;
int i;
for (i = 0; i < queues; i++) {
nc = qemu_new_net_client(&net_vhost_user_info, peer, device, name);
snprintf(nc->info_str, sizeof(nc->info_str), "vhost-user%d to %s",
i, chr->label);
snprintf(nc->info_str, sizeof(nc->info_str), "vhost-user to %s",
chr->label);
s = DO_UPCAST(VhostUserState, nc, nc);
/* We don't provide a receive callback */
s->nc.receive_disabled = 1;
s->chr = chr;
s->nc.queue_index = i;
qemu_chr_add_handlers(s->chr, NULL, NULL, net_vhost_user_event, s);
}
return 0;
}
@ -230,7 +226,6 @@ static int net_vhost_check_net(void *opaque, QemuOpts *opts, Error **errp)
int net_init_vhost_user(const NetClientOptions *opts, const char *name,
NetClientState *peer, Error **errp)
{
uint32_t queues;
const NetdevVhostUserOptions *vhost_user_opts;
CharDriverState *chr;
@ -248,12 +243,6 @@ int net_init_vhost_user(const NetClientOptions *opts, const char *name,
return -1;
}
/* number of queues for multiqueue */
if (vhost_user_opts->has_queues) {
queues = vhost_user_opts->queues;
} else {
queues = 1;
}
return net_vhost_user_init(peer, "vhost_user", name, chr, queues);
return net_vhost_user_init(peer, "vhost_user", name, chr);
}

6
qapi-schema.json
View File

@ -2466,16 +2466,12 @@
#
# @vhostforce: #optional vhost on for non-MSIX virtio guests (default: false).
#
# @queues: #optional number of queues to be created for multiqueue vhost-user
# (default: 1) (Since 2.4)
#
# Since 2.1
##
{ 'struct': 'NetdevVhostUserOptions',
'data': {
'chardev': 'str',
'*vhostforce': 'bool',
'*queues': 'uint32' } }
'*vhostforce': 'bool' } }
##
# @NetClientOptions

5
qemu-options.hx
View File

@ -1963,14 +1963,13 @@ The hubport netdev lets you connect a NIC to a QEMU "vlan" instead of a single
netdev. @code{-net} and @code{-device} with parameter @option{vlan} create the
required hub automatically.
@item -netdev vhost-user,chardev=@var{id}[,vhostforce=on|off][,queues=n]
@item -netdev vhost-user,chardev=@var{id}[,vhostforce=on|off]
Establish a vhost-user netdev, backed by a chardev @var{id}. The chardev should
be a unix domain socket backed one. The vhost-user uses a specifically defined
protocol to pass vhost ioctl replacement messages to an application on the other
end of the socket. On non-MSIX guests, the feature can be forced with
@var{vhostforce}. Use 'queues=@var{n}' to specify the number of queues to
be created for multiqueue vhost-user.
@var{vhostforce}.
Example:
@example