From 33505e164e24a660a3ffd406111de3b215b78ccc Mon Sep 17 00:00:00 2001 From: Marcel Apfelbaum Date: Thu, 24 Sep 2015 17:04:05 +0200 Subject: [PATCH 10/13] vhost-user: add VHOST_USER_GET_QUEUE_NUM message Message-id: <1443114248-18614-9-git-send-email-marcel@redhat.com> Patchwork-id: 67940 O-Subject: [RHEL-7.2 qemu-kvm-rhev PATCH 08/11] vhost-user: add VHOST_USER_GET_QUEUE_NUM message Bugzilla: 1207687 RH-Acked-by: Victor Kaplansky RH-Acked-by: Xiao Wang RH-Acked-by: Michael S. Tsirkin From: Yuanhan Liu This is for querying how many queues the backend supports if it has mq support(when VHOST_USER_PROTOCOL_F_MQ flag is set from the quried protocol features). vhost_net_get_max_queues() is the interface to export that value, and to tell if the backend supports # of queues user requested, which is done in the following patch. Signed-off-by: Yuanhan Liu Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin Signed-off-by: Yuanhan Liu Tested-by: Marcel Apfelbaum (cherry picked from commit e2051e9e004649b53af4db34f78c689fb44e075b) Signed-off-by: Marcel Apfelbaum Signed-off-by: Miroslav Rezanina --- docs/specs/vhost-user.txt | 11 +++++++++++ hw/net/vhost_net.c | 12 ++++++++++++ hw/virtio/vhost-user.c | 15 ++++++++++++++- include/hw/virtio/vhost.h | 1 + include/net/vhost_net.h | 1 + 5 files changed, 39 insertions(+), 1 deletion(-) diff --git a/docs/specs/vhost-user.txt b/docs/specs/vhost-user.txt index ccbbcbb..43db9b4 100644 --- a/docs/specs/vhost-user.txt +++ b/docs/specs/vhost-user.txt @@ -301,3 +301,14 @@ Message types Bits (0-7) of the payload contain the vring index. Bit 8 is the invalid FD flag. This flag is set when there is no file descriptor in the ancillary data. + + * VHOST_USER_GET_QUEUE_NUM + + Id: 17 + Equivalent ioctl: N/A + Master payload: N/A + Slave payload: u64 + + Query how many queues the backend supports. This request should be + sent only when VHOST_USER_PROTOCOL_F_MQ is set in quried protocol + features by VHOST_USER_GET_PROTOCOL_FEATURES. diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c index b7d29b7..f663e5a 100644 --- a/hw/net/vhost_net.c +++ b/hw/net/vhost_net.c @@ -122,6 +122,11 @@ void vhost_net_ack_features(struct vhost_net *net, uint64_t features) vhost_ack_features(&net->dev, vhost_net_get_feature_bits(net), features); } +uint64_t vhost_net_get_max_queues(VHostNetState *net) +{ + return net->dev.max_queues; +} + static int vhost_net_get_fd(NetClientState *backend) { switch (backend->info->type) { @@ -144,6 +149,8 @@ struct vhost_net *vhost_net_init(VhostNetOptions *options) goto fail; } + net->dev.max_queues = 1; + if (backend_kernel) { r = vhost_net_get_fd(options->net_backend); if (r < 0) { @@ -414,6 +421,11 @@ VHostNetState *get_vhost_net(NetClientState *nc) return vhost_net; } #else +uint64_t vhost_net_get_max_queues(VHostNetState *net) +{ + return 1; +} + struct vhost_net *vhost_net_init(VhostNetOptions *options) { error_report("vhost-net support is not compiled in"); diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 708951c..30b9852 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -25,7 +25,9 @@ #define VHOST_MEMORY_MAX_NREGIONS 8 #define VHOST_USER_F_PROTOCOL_FEATURES 30 -#define VHOST_USER_PROTOCOL_FEATURE_MASK 0x0ULL +#define VHOST_USER_PROTOCOL_FEATURE_MASK 0x1ULL + +#define VHOST_USER_PROTOCOL_F_MQ 0 typedef enum VhostUserRequest { VHOST_USER_NONE = 0, @@ -45,6 +47,7 @@ typedef enum VhostUserRequest { VHOST_USER_SET_VRING_ERR = 14, VHOST_USER_GET_PROTOCOL_FEATURES = 15, VHOST_USER_SET_PROTOCOL_FEATURES = 16, + VHOST_USER_GET_QUEUE_NUM = 17, VHOST_USER_MAX } VhostUserRequest; @@ -211,6 +214,7 @@ static int vhost_user_call(struct vhost_dev *dev, unsigned long int request, switch (msg_request) { case VHOST_USER_GET_FEATURES: case VHOST_USER_GET_PROTOCOL_FEATURES: + case VHOST_USER_GET_QUEUE_NUM: need_reply = 1; break; @@ -315,6 +319,7 @@ static int vhost_user_call(struct vhost_dev *dev, unsigned long int request, switch (msg_request) { case VHOST_USER_GET_FEATURES: case VHOST_USER_GET_PROTOCOL_FEATURES: + case VHOST_USER_GET_QUEUE_NUM: if (msg.size != sizeof(m.u64)) { error_report("Received bad msg size.\n"); return -1; @@ -366,6 +371,14 @@ static int vhost_user_init(struct vhost_dev *dev, void *opaque) if (err < 0) { return err; } + + /* query the max queues we support if backend supports Multiple Queue */ + if (dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_MQ)) { + err = vhost_user_call(dev, VHOST_USER_GET_QUEUE_NUM, &dev->max_queues); + if (err < 0) { + return err; + } + } } return 0; diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h index 798c8cc..9593f63 100644 --- a/include/hw/virtio/vhost.h +++ b/include/hw/virtio/vhost.h @@ -42,6 +42,7 @@ struct vhost_dev { unsigned long long acked_features; unsigned long long backend_features; unsigned long long protocol_features; + unsigned long long max_queues; bool started; bool log_enabled; vhost_log_chunk_t *log; diff --git a/include/net/vhost_net.h b/include/net/vhost_net.h index 840d4b1..8db723e 100644 --- a/include/net/vhost_net.h +++ b/include/net/vhost_net.h @@ -13,6 +13,7 @@ typedef struct VhostNetOptions { void *opaque; } VhostNetOptions; +uint64_t vhost_net_get_max_queues(VHostNetState *net); struct vhost_net *vhost_net_init(VhostNetOptions *options); int vhost_net_start(VirtIODevice *dev, NetClientState *ncs, int total_queues); -- 1.8.3.1