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authorSteven <sluong@cisco.com>2017-04-04 16:56:54 -0700
committerDamjan Marion <dmarion.lists@gmail.com>2017-04-11 14:52:11 +0000
commite4dcba801ae7abeea7d8a9f5d0784a540a3c2bd8 (patch)
tree7db97685af23ffdbdccaa75ed6a45f8da98183fb /src/vnet/devices/virtio
parentecba903bcfc5046b0d8aee18433ab9fc09c6a68f (diff)
vhost: interrupt mode enhancements
- Add cpu index to the vring structure for quick lookup - Reduce the code that needs to be protected by vlib_worker_thread_barrier_sync - Set minimum timer no less than 1 ms Change-Id: Iafef4bf6879a8efb350abf4e0f517e38f7ff7a8b Signed-off-by: Steven <sluong@cisco.com>
Diffstat (limited to 'src/vnet/devices/virtio')
-rw-r--r--src/vnet/devices/virtio/vhost-user.c59
-rw-r--r--src/vnet/devices/virtio/vhost-user.h1
2 files changed, 26 insertions, 34 deletions
diff --git a/src/vnet/devices/virtio/vhost-user.c b/src/vnet/devices/virtio/vhost-user.c
index 5e720f6510a..cce9705e45b 100644
--- a/src/vnet/devices/virtio/vhost-user.c
+++ b/src/vnet/devices/virtio/vhost-user.c
@@ -404,6 +404,7 @@ vhost_user_rx_thread_placement ()
thread_index = vui_workers[i];
i++;
vhc = &vum->cpus[thread_index];
+ txvq->interrupt_thread_index = thread_index;
iaq.qid = qid;
iaq.vhost_iface_index = vui - vum->vhost_user_interfaces;
@@ -534,45 +535,33 @@ vhost_user_set_interrupt_pending (vhost_user_intf_t * vui, u32 ifq)
vhost_user_main_t *vum = &vhost_user_main;
vhost_cpu_t *vhc;
u32 thread_index;
- vhost_iface_and_queue_t *vhiq;
vlib_main_t *vm;
- u32 ifq2;
- u8 done = 0;
+ u32 ifq2, qid;
+ vhost_user_vring_t *txvq;
+
+ qid = ifq & 0xff;
+ if ((qid % 2) == 0)
+ /* Only care about the odd number virtqueue which is TX */
+ return;
if (vhost_user_intf_ready (vui))
{
- vec_foreach (vhc, vum->cpus)
- {
- if (vhc->operation_mode == VHOST_USER_POLLING_MODE)
- continue;
-
- vec_foreach (vhiq, vhc->rx_queues)
+ txvq = &vui->vrings[qid];
+ thread_index = txvq->interrupt_thread_index;
+ vhc = &vum->cpus[thread_index];
+ if (vhc->operation_mode == VHOST_USER_INTERRUPT_MODE)
{
+ vm = vlib_mains ? vlib_mains[thread_index] : &vlib_global_main;
/*
- * Match the interface and the virtqueue number
+ * Convert virtqueue number in the lower byte to vring
+ * queue index for the input node process. Top bytes contain
+ * the interface, lower byte contains the queue index.
*/
- if ((vhiq->vhost_iface_index == (ifq >> 8)) &&
- (VHOST_VRING_IDX_TX (vhiq->qid) == (ifq & 0xff)))
- {
- thread_index = vhc - vum->cpus;
- vm = vlib_mains ? vlib_mains[thread_index] : &vlib_global_main;
- /*
- * Convert RX virtqueue number in the lower byte to vring
- * queue index for the input node process. Top bytes contain
- * the interface, lower byte contains the queue index.
- */
- ifq2 = ((ifq >> 8) << 8) | vhiq->qid;
- vhc->pending_input_bitmap =
- clib_bitmap_set (vhc->pending_input_bitmap, ifq2, 1);
- vlib_node_set_interrupt_pending (vm,
- vhost_user_input_node.index);
- done = 1;
- break;
- }
+ ifq2 = ((ifq >> 8) << 8) | qid / 2;
+ vhc->pending_input_bitmap =
+ clib_bitmap_set (vhc->pending_input_bitmap, ifq2, 1);
+ vlib_node_set_interrupt_pending (vm, vhost_user_input_node.index);
}
- if (done)
- break;
- }
}
}
@@ -605,15 +594,14 @@ vhost_user_kickfd_read_ready (unix_file_t * uf)
n = read (uf->file_descriptor, ((char *) &buff), 8);
DBG_SOCK ("if %d KICK queue %d", uf->private_data >> 8, qid);
-
- vlib_worker_thread_barrier_sync (vlib_get_main ());
if (!vui->vrings[qid].started ||
(vhost_user_intf_ready (vui) != vui->is_up))
{
+ vlib_worker_thread_barrier_sync (vlib_get_main ());
vui->vrings[qid].started = 1;
vhost_user_update_iface_state (vui);
+ vlib_worker_thread_barrier_release (vlib_get_main ());
}
- vlib_worker_thread_barrier_release (vlib_get_main ());
vhost_user_set_interrupt_pending (vui, uf->private_data);
return 0;
@@ -2814,6 +2802,9 @@ vhost_user_send_interrupt_process (vlib_main_t * vm,
clib_warning ("BUG: unhandled event type %d", event_type);
break;
}
+ /* No less than 1 millisecond */
+ if (timeout < 1e-3)
+ timeout = 1e-3;
}
return 0;
}
diff --git a/src/vnet/devices/virtio/vhost-user.h b/src/vnet/devices/virtio/vhost-user.h
index 67f18b8ed8e..80f58a20018 100644
--- a/src/vnet/devices/virtio/vhost-user.h
+++ b/src/vnet/devices/virtio/vhost-user.h
@@ -210,6 +210,7 @@ typedef struct
u32 callfd_idx;
u32 kickfd_idx;
u64 log_guest_addr;
+ u32 interrupt_thread_index;
} vhost_user_vring_t;
#define VHOST_USER_POLLING_MODE 0