On Fri, Jan 4, 2013 at 5:12 AM, Jason Wang <jasowang@xxxxxxxxxx> wrote:
> On 12/29/2012 01:52 AM, Blue Swirl wrote:
>> On Fri, Dec 28, 2012 at 10:32 AM, Jason Wang <jasowang@xxxxxxxxxx> wrote:
>>> This patch implements both userspace and vhost support for multiple queue
>>> virtio-net (VIRTIO_NET_F_MQ). This is done by introducing an array of
>>> VirtIONetQueue to VirtIONet.
>>>
>>> Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
>>> ---
>>> hw/virtio-net.c | 318 ++++++++++++++++++++++++++++++++++++++++++-------------
>>> hw/virtio-net.h | 27 +++++-
>>> 2 files changed, 271 insertions(+), 74 deletions(-)
> [...]
>>> static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
>>> {
>>> VirtIONet *n = to_virtio_net(vdev);
>>> @@ -464,6 +578,8 @@ static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
>>> status = virtio_net_handle_mac(n, ctrl.cmd, &elem);
>>> else if (ctrl.class == VIRTIO_NET_CTRL_VLAN)
>>> status = virtio_net_handle_vlan_table(n, ctrl.cmd, &elem);
>>> + else if (ctrl.class == VIRTIO_NET_CTRL_MQ)
>> Please add braces.
>
> Sure.
>>
>>> + status = virtio_net_handle_mq(n, ctrl.cmd, &elem);
>>>
>>> stb_p(elem.in_sg[elem.in_num - 1].iov_base, status);
>>>
>>> @@ -477,19 +593,24 @@ static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
>>> static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
>>> {
>>> VirtIONet *n = to_virtio_net(vdev);
>>> + int queue_index = vq2q(virtio_get_queue_index(vq));
>>>
>>> - qemu_flush_queued_packets(qemu_get_queue(n->nic));
>>> + qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index));
>>> }
>>>
>>>
> [...]
>>>
>>> +static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue, int ctrl)
>>> +{
>>> + VirtIODevice *vdev = &n->vdev;
>>> + int i;
>>> +
>>> + n->multiqueue = multiqueue;
>>> +
>>> + if (!multiqueue)
>>> + n->curr_queues = 1;
>> Ditto. Didn't checkpatch.pl catch these or did you not check?
>
> Sorry, will add braces here. I run checkpatch.pl but finally find that
> some or lots of the existed codes (such as this file) does not obey the
> rules. So I'm not sure whether I need to correct my own codes, or left
> them as this file does and correct them all in the future.
The goal is to make QEMU codebase conform to CODING_STYLE. Currently
this is not the case for some amounts of code, but we should use
opportunities like this to advance towards that goal.
>>
> [...]
>>> } QEMU_PACKED;
>>>
>>> /* This is the first element of the scatter-gather list. If you don't
>>> @@ -168,6 +172,26 @@ struct virtio_net_ctrl_mac {
>>> #define VIRTIO_NET_CTRL_VLAN_ADD 0
>>> #define VIRTIO_NET_CTRL_VLAN_DEL 1
>>>
>>> +/*
>>> + * Control Multiqueue
>>> + *
>>> + * The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET
>>> + * enables multiqueue, specifying the number of the transmit and
>>> + * receive queues that will be used. After the command is consumed and acked by
>>> + * the device, the device will not steer new packets on receive virtqueues
>>> + * other than specified nor read from transmit virtqueues other than specified.
>>> + * Accordingly, driver should not transmit new packets on virtqueues other than
>>> + * specified.
>>> + */
>>> +struct virtio_net_ctrl_mq {
>> VirtIONetCtrlMQ and please don't forget the typedef.
>
> Sure, but the same question as above. (See other structures in this file).
>>
>>> + uint16_t virtqueue_pairs;
>>> +};
>>> +
>>> +#define VIRTIO_NET_CTRL_MQ 4
>>> + #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 0
>>> + #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN 1
>>> + #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX 0x8000
>>> +
>>> #define DEFINE_VIRTIO_NET_FEATURES(_state, _field) \
>>> DEFINE_VIRTIO_COMMON_FEATURES(_state, _field), \
>>> DEFINE_PROP_BIT("csum", _state, _field, VIRTIO_NET_F_CSUM, true), \
>>> @@ -186,5 +210,6 @@ struct virtio_net_ctrl_mac {
>>> DEFINE_PROP_BIT("ctrl_vq", _state, _field, VIRTIO_NET_F_CTRL_VQ, true), \
>>> DEFINE_PROP_BIT("ctrl_rx", _state, _field, VIRTIO_NET_F_CTRL_RX, true), \
>>> DEFINE_PROP_BIT("ctrl_vlan", _state, _field, VIRTIO_NET_F_CTRL_VLAN, true), \
>>> - DEFINE_PROP_BIT("ctrl_rx_extra", _state, _field, VIRTIO_NET_F_CTRL_RX_EXTRA, true)
>>> + DEFINE_PROP_BIT("ctrl_rx_extra", _state, _field, VIRTIO_NET_F_CTRL_RX_EXTRA, true), \
>>> + DEFINE_PROP_BIT("mq", _state, _field, VIRTIO_NET_F_MQ, true)
>>> #endif
>>> --
>>> 1.7.1
>>>
>>>
>
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