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authorSteven Luong <sluong@cisco.com>2021-04-21 09:54:34 -0700
committerBeno�t Ganne <bganne@cisco.com>2021-08-18 12:25:34 +0000
commit38071b1331b44746679997f6e66081c4936d087c (patch)
tree2c25d05051510603a21528a7d7fcd15754a0ae09
parent91144fbf54764feb005a33419d0129febd2365d4 (diff)
vhost: interrupt mode support with mq
vhost interrupt mode support with mq does not work when coalesce frame is not configured to 0. When packed-ring is configured, we were also setting the wrong flag for want-interrupt. No need to trigger an interrupt to RX infra if there is at least one queue in the same thread that is doing polling. Type: fix Signed-off-by: Steven Luong <sluong@cisco.com> Change-Id: I8e64250f2aa6bf611a777a53e4d2c1076d83305f
-rw-r--r--src/vnet/devices/virtio/vhost_user.c299
-rw-r--r--src/vnet/devices/virtio/vhost_user.h10
-rw-r--r--src/vnet/devices/virtio/vhost_user_output.c38
3 files changed, 209 insertions, 138 deletions
diff --git a/src/vnet/devices/virtio/vhost_user.c b/src/vnet/devices/virtio/vhost_user.c
index 3217c72f95d..7ea7cbef995 100644
--- a/src/vnet/devices/virtio/vhost_user.c
+++ b/src/vnet/devices/virtio/vhost_user.c
@@ -106,13 +106,13 @@ unmap_all_mem_regions (vhost_user_intf_t * vui)
}
vui->nregions = 0;
- for (q = 0; q < vui->num_qid; q++)
- {
- vq = &vui->vrings[q];
- vq->avail = 0;
- vq->used = 0;
- vq->desc = 0;
- }
+ FOR_ALL_VHOST_RX_TXQ (q, vui)
+ {
+ vq = &vui->vrings[q];
+ vq->avail = 0;
+ vq->used = 0;
+ vq->desc = 0;
+ }
}
static_always_inline void
@@ -163,16 +163,28 @@ vhost_user_rx_thread_placement (vhost_user_intf_t * vui, u32 qid)
vnet_main_t *vnm = vnet_get_main ();
int rv;
u32 q = qid >> 1;
+ vhost_user_main_t *vum = &vhost_user_main;
ASSERT ((qid & 1) == 1); // should be odd
// Assign new queue mappings for the interface
+ if (txvq->queue_index != ~0)
+ return;
vnet_hw_if_set_input_node (vnm, vui->hw_if_index,
vhost_user_input_node.index);
txvq->queue_index = vnet_hw_if_register_rx_queue (vnm, vui->hw_if_index, q,
VNET_HW_IF_RXQ_THREAD_ANY);
+ txvq->thread_index =
+ vnet_hw_if_get_rx_queue_thread_index (vnm, txvq->queue_index);
+
if (txvq->mode == VNET_HW_IF_RX_MODE_UNKNOWN)
/* Set polling as the default */
txvq->mode = VNET_HW_IF_RX_MODE_POLLING;
+ if (txvq->mode == VNET_HW_IF_RX_MODE_POLLING)
+ {
+ vhost_cpu_t *cpu = vec_elt_at_index (vum->cpus, txvq->thread_index);
+ /* Keep a polling queue count for each thread */
+ cpu->polling_q_count++;
+ }
txvq->qid = q;
rv = vnet_hw_if_set_rx_queue_mode (vnm, txvq->queue_index, txvq->mode);
if (rv)
@@ -227,7 +239,7 @@ vhost_user_thread_placement (vhost_user_intf_t * vui, u32 qid)
{
if (qid & 1) // RX is odd, TX is even
{
- if (vui->vrings[qid].qid == -1)
+ if (vui->vrings[qid].queue_index == ~0)
vhost_user_rx_thread_placement (vui, qid);
}
else
@@ -258,10 +270,17 @@ vhost_user_kickfd_read_ready (clib_file_t * uf)
vq->kickfd_idx);
}
- if (is_txq && (vhost_user_intf_ready (vui) &&
- ((vq->mode == VNET_HW_IF_RX_MODE_ADAPTIVE) ||
- (vq->mode == VNET_HW_IF_RX_MODE_INTERRUPT))))
- vnet_hw_if_rx_queue_set_int_pending (vnm, vq->queue_index);
+ if (is_txq && (vq->mode != VNET_HW_IF_RX_MODE_POLLING) &&
+ vhost_user_intf_ready (vui))
+ {
+ vhost_cpu_t *cpu = vec_elt_at_index (vum->cpus, vq->thread_index);
+ /*
+ * If the thread has more than 1 queue and the other queue is in polling
+ * mode, there is no need to trigger an interrupt
+ */
+ if (cpu->polling_q_count == 0)
+ vnet_hw_if_rx_queue_set_int_pending (vnm, vq->queue_index);
+ }
return 0;
}
@@ -276,6 +295,9 @@ vhost_user_vring_init (vhost_user_intf_t * vui, u32 qid)
vring->callfd_idx = ~0;
vring->errfd = -1;
vring->qid = -1;
+ vring->queue_index = ~0;
+ vring->thread_index = ~0;
+ vring->mode = VNET_HW_IF_RX_MODE_POLLING;
clib_spinlock_init (&vring->vring_lock);
@@ -319,11 +341,16 @@ vhost_user_vring_close (vhost_user_intf_t * vui, u32 qid)
clib_spinlock_free (&vring->vring_lock);
- // save the qid so that we don't need to unassign and assign_rx_thread
- // when the interface comes back up. They are expensive calls.
+ // save the needed information in vrings prior to being wiped out
u16 q = vui->vrings[qid].qid;
+ u32 queue_index = vui->vrings[qid].queue_index;
+ u32 mode = vui->vrings[qid].mode;
+ u32 thread_index = vui->vrings[qid].thread_index;
vhost_user_vring_init (vui, qid);
vui->vrings[qid].qid = q;
+ vui->vrings[qid].queue_index = queue_index;
+ vui->vrings[qid].mode = mode;
+ vui->vrings[qid].thread_index = thread_index;
}
static_always_inline void
@@ -342,13 +369,38 @@ vhost_user_if_disconnect (vhost_user_intf_t * vui)
vui->is_ready = 0;
- for (q = 0; q < vui->num_qid; q++)
- vhost_user_vring_close (vui, q);
+ FOR_ALL_VHOST_RX_TXQ (q, vui) { vhost_user_vring_close (vui, q); }
unmap_all_mem_regions (vui);
vu_log_debug (vui, "interface ifindex %d disconnected", vui->sw_if_index);
}
+void
+vhost_user_set_operation_mode (vhost_user_intf_t *vui,
+ vhost_user_vring_t *txvq)
+{
+ if (vhost_user_is_packed_ring_supported (vui))
+ {
+ if (txvq->used_event)
+ {
+ if (txvq->mode == VNET_HW_IF_RX_MODE_POLLING)
+ txvq->used_event->flags = VRING_EVENT_F_DISABLE;
+ else
+ txvq->used_event->flags = 0;
+ }
+ }
+ else
+ {
+ if (txvq->used)
+ {
+ if (txvq->mode == VNET_HW_IF_RX_MODE_POLLING)
+ txvq->used->flags = VRING_USED_F_NO_NOTIFY;
+ else
+ txvq->used->flags = 0;
+ }
+ }
+}
+
static clib_error_t *
vhost_user_socket_read (clib_file_t * uf)
{
@@ -579,19 +631,19 @@ vhost_user_socket_read (clib_file_t * uf)
* Re-compute desc, used, and avail descriptor table if vring address
* is set.
*/
- for (q = 0; q < vui->num_qid; q++)
- {
- if (vui->vrings[q].desc_user_addr &&
- vui->vrings[q].used_user_addr && vui->vrings[q].avail_user_addr)
- {
- vui->vrings[q].desc =
- map_user_mem (vui, vui->vrings[q].desc_user_addr);
- vui->vrings[q].used =
- map_user_mem (vui, vui->vrings[q].used_user_addr);
- vui->vrings[q].avail =
- map_user_mem (vui, vui->vrings[q].avail_user_addr);
- }
- }
+ FOR_ALL_VHOST_RX_TXQ (q, vui)
+ {
+ if (vui->vrings[q].desc_user_addr && vui->vrings[q].used_user_addr &&
+ vui->vrings[q].avail_user_addr)
+ {
+ vui->vrings[q].desc =
+ map_user_mem (vui, vui->vrings[q].desc_user_addr);
+ vui->vrings[q].used =
+ map_user_mem (vui, vui->vrings[q].used_user_addr);
+ vui->vrings[q].avail =
+ map_user_mem (vui, vui->vrings[q].avail_user_addr);
+ }
+ }
vlib_worker_thread_barrier_release (vm);
break;
@@ -665,12 +717,8 @@ vhost_user_socket_read (clib_file_t * uf)
vui->vrings[msg.state.index].last_kick =
vui->vrings[msg.state.index].last_used_idx;
- /* tell driver that we don't want interrupts */
- if (vhost_user_is_packed_ring_supported (vui))
- vui->vrings[msg.state.index].used_event->flags =
- VRING_EVENT_F_DISABLE;
- else
- vui->vrings[msg.state.index].used->flags = VRING_USED_F_NO_NOTIFY;
+ /* tell driver that we want interrupts or not */
+ vhost_user_set_operation_mode (vui, &vui->vrings[msg.state.index]);
vlib_worker_thread_barrier_release (vm);
vhost_user_update_iface_state (vui);
break;
@@ -1180,6 +1228,7 @@ vhost_user_send_interrupt_process (vlib_main_t * vm,
case VHOST_USER_EVENT_START_TIMER:
stop_timer = 0;
+ timeout = 1e-3;
if (!vlib_process_suspend_time_is_zero (poll_time_remaining))
break;
/* fall through */
@@ -1188,32 +1237,23 @@ vhost_user_send_interrupt_process (vlib_main_t * vm,
/* *INDENT-OFF* */
pool_foreach (vui, vum->vhost_user_interfaces) {
next_timeout = timeout;
- for (qid = 0; qid < vui->num_qid / 2; qid += 2)
- {
- vhost_user_vring_t *rxvq = &vui->vrings[qid];
- vhost_user_vring_t *txvq = &vui->vrings[qid + 1];
-
- if (txvq->qid == -1)
- continue;
- if (txvq->n_since_last_int)
- {
- if (now >= txvq->int_deadline)
- vhost_user_send_call (vm, vui, txvq);
- else
- next_timeout = txvq->int_deadline - now;
- }
-
- if (rxvq->n_since_last_int)
- {
- if (now >= rxvq->int_deadline)
- vhost_user_send_call (vm, vui, rxvq);
- else
- next_timeout = rxvq->int_deadline - now;
- }
-
- if ((next_timeout < timeout) && (next_timeout > 0.0))
- timeout = next_timeout;
- }
+ FOR_ALL_VHOST_RX_TXQ (qid, vui)
+ {
+ vhost_user_vring_t *vq = &vui->vrings[qid];
+
+ if (vq->started == 0)
+ continue;
+ if (vq->n_since_last_int)
+ {
+ if (now >= vq->int_deadline)
+ vhost_user_send_call (vm, vui, vq);
+ else
+ next_timeout = vq->int_deadline - now;
+ }
+
+ if ((next_timeout < timeout) && (next_timeout > 0.0))
+ timeout = next_timeout;
+ }
}
/* *INDENT-ON* */
break;
@@ -1364,10 +1404,10 @@ vhost_user_term_if (vhost_user_intf_t * vui)
vhost_user_update_gso_interface_count (vui, 0 /* delete */ );
vhost_user_update_iface_state (vui);
- for (q = 0; q < vui->num_qid; q++)
- {
- clib_spinlock_free (&vui->vrings[q].vring_lock);
- }
+ FOR_ALL_VHOST_RX_TXQ (q, vui)
+ {
+ clib_spinlock_free (&vui->vrings[q].vring_lock);
+ }
if (vui->unix_server_index != ~0)
{
@@ -1403,28 +1443,33 @@ vhost_user_delete_if (vnet_main_t * vnm, vlib_main_t * vm, u32 sw_if_index)
vu_log_debug (vui, "Deleting vhost-user interface %s (instance %d)",
hwif->name, hwif->dev_instance);
- for (qid = 1; qid < vui->num_qid / 2; qid += 2)
- {
- vhost_user_vring_t *txvq = &vui->vrings[qid];
+ FOR_ALL_VHOST_TXQ (qid, vui)
+ {
+ vhost_user_vring_t *txvq = &vui->vrings[qid];
- if (txvq->qid == -1)
- continue;
- if ((vum->ifq_count > 0) &&
- ((txvq->mode == VNET_HW_IF_RX_MODE_INTERRUPT) ||
- (txvq->mode == VNET_HW_IF_RX_MODE_ADAPTIVE)))
- {
- vum->ifq_count--;
- // Stop the timer if there is no more interrupt interface/queue
- if ((vum->ifq_count == 0) &&
- (vum->coalesce_time > 0.0) && (vum->coalesce_frames > 0))
- {
- vlib_process_signal_event (vm,
- vhost_user_send_interrupt_node.index,
- VHOST_USER_EVENT_STOP_TIMER, 0);
- break;
- }
- }
- }
+ if ((txvq->mode == VNET_HW_IF_RX_MODE_POLLING) &&
+ (txvq->thread_index != ~0))
+ {
+ vhost_cpu_t *cpu = vec_elt_at_index (vum->cpus, txvq->thread_index);
+ ASSERT (cpu->polling_q_count != 0);
+ cpu->polling_q_count--;
+ }
+
+ if ((vum->ifq_count > 0) &&
+ ((txvq->mode == VNET_HW_IF_RX_MODE_INTERRUPT) ||
+ (txvq->mode == VNET_HW_IF_RX_MODE_ADAPTIVE)))
+ {
+ vum->ifq_count--;
+ // Stop the timer if there is no more interrupt interface/queue
+ if (vum->ifq_count == 0)
+ {
+ vlib_process_signal_event (vm,
+ vhost_user_send_interrupt_node.index,
+ VHOST_USER_EVENT_STOP_TIMER, 0);
+ break;
+ }
+ }
+ }
// Disable and reset interface
vhost_user_term_if (vui);
@@ -1922,9 +1967,11 @@ vhost_user_show_desc (vlib_main_t * vm, vhost_user_intf_t * vui, int q,
vhost_user_vring_t *vq = &vui->vrings[q];
if (vq->avail && vq->used)
- vlib_cli_output (vm, " avail.flags %x avail event idx %u avail.idx %d "
- "used event idx %u used.idx %d\n", vq->avail->flags,
- vhost_user_avail_event_idx (vq), vq->avail->idx,
+ vlib_cli_output (vm,
+ " avail.flags %x avail event idx %u avail.idx %d "
+ "used.flags %x used event idx %u used.idx %d\n",
+ vq->avail->flags, vhost_user_avail_event_idx (vq),
+ vq->avail->idx, vq->used->flags,
vhost_user_used_event_idx (vq), vq->used->idx);
vhost_user_show_fds (vm, vq);
@@ -2148,6 +2195,12 @@ show_vhost_user_command_fn (vlib_main_t * vm,
vlib_cli_output (vm, " Number of rx virtqueues in interrupt mode: %d",
vum->ifq_count);
vlib_cli_output (vm, " Number of GSO interfaces: %d", vum->gso_count);
+ for (u32 tid = 0; tid <= vlib_num_workers (); tid++)
+ {
+ vhost_cpu_t *cpu = vec_elt_at_index (vum->cpus, tid);
+ vlib_cli_output (vm, " Thread %u: Polling queue count %u", tid,
+ cpu->polling_q_count);
+ }
for (i = 0; i < vec_len (hw_if_indices); i++)
{
@@ -2199,19 +2252,16 @@ show_vhost_user_command_fn (vlib_main_t * vm,
vlib_cli_output (vm, " rx placement: ");
- for (qid = 1; qid < vui->num_qid / 2; qid += 2)
- {
- vnet_main_t *vnm = vnet_get_main ();
- uword thread_index;
- vhost_user_vring_t *txvq = &vui->vrings[qid];
+ FOR_ALL_VHOST_TXQ (qid, vui)
+ {
+ vhost_user_vring_t *txvq = &vui->vrings[qid];
- if (txvq->qid == -1)
- continue;
- thread_index =
- vnet_hw_if_get_rx_queue_thread_index (vnm, txvq->queue_index);
- vlib_cli_output (vm, " thread %d on vring %d, %U\n", thread_index,
- qid, format_vnet_hw_if_rx_mode, txvq->mode);
- }
+ if (txvq->qid == -1)
+ continue;
+ vlib_cli_output (vm, " thread %d on vring %d, %U\n",
+ txvq->thread_index, qid, format_vnet_hw_if_rx_mode,
+ txvq->mode);
+ }
vlib_cli_output (vm, " tx placement: %s\n",
vui->use_tx_spinlock ? "spin-lock" : "lock-free");
@@ -2244,29 +2294,30 @@ show_vhost_user_command_fn (vlib_main_t * vm,
vui->regions[j].mmap_offset,
pointer_to_uword (vui->region_mmap_addr[j]));
}
- for (q = 0; q < vui->num_qid; q++)
- {
- if (!vui->vrings[q].started)
- continue;
-
- vlib_cli_output (vm, "\n Virtqueue %d (%s%s)\n", q,
- (q & 1) ? "RX" : "TX",
- vui->vrings[q].enabled ? "" : " disabled");
-
- vlib_cli_output (vm,
- " qsz %d last_avail_idx %d last_used_idx %d"
- " last_kick %u\n",
- vui->vrings[q].qsz_mask + 1,
- vui->vrings[q].last_avail_idx,
- vui->vrings[q].last_used_idx,
- vui->vrings[q].last_kick);
-
- if (vhost_user_is_packed_ring_supported (vui))
- vhost_user_show_desc_packed (vm, vui, q, show_descr,
- show_verbose);
- else
- vhost_user_show_desc (vm, vui, q, show_descr, show_verbose);
- }
+ FOR_ALL_VHOST_RX_TXQ (q, vui)
+ {
+ if (!vui->vrings[q].started)
+ continue;
+
+ vlib_cli_output (vm, "\n Virtqueue %d (%s%s)\n", q,
+ (q & 1) ? "RX" : "TX",
+ vui->vrings[q].enabled ? "" : " disabled");
+ if (q & 1)
+ vlib_cli_output (vm, " global RX queue index %u\n",
+ vui->vrings[q].queue_index);
+
+ vlib_cli_output (
+ vm,
+ " qsz %d last_avail_idx %d last_used_idx %d"
+ " last_kick %u\n",
+ vui->vrings[q].qsz_mask + 1, vui->vrings[q].last_avail_idx,
+ vui->vrings[q].last_used_idx, vui->vrings[q].last_kick);
+
+ if (vhost_user_is_packed_ring_supported (vui))
+ vhost_user_show_desc_packed (vm, vui, q, show_descr, show_verbose);
+ else
+ vhost_user_show_desc (vm, vui, q, show_descr, show_verbose);
+ }
vlib_cli_output (vm, "\n");
}
done:
diff --git a/src/vnet/devices/virtio/vhost_user.h b/src/vnet/devices/virtio/vhost_user.h
index 63a0bc0da48..8ecf4a3aca7 100644
--- a/src/vnet/devices/virtio/vhost_user.h
+++ b/src/vnet/devices/virtio/vhost_user.h
@@ -231,6 +231,7 @@ typedef struct
u16 last_kick;
u8 first_kick;
u32 queue_index;
+ u32 thread_index;
} vhost_user_vring_t;
#define VHOST_USER_EVENT_START_TIMER 1
@@ -290,6 +291,12 @@ typedef struct
u8 enable_event_idx;
} vhost_user_intf_t;
+#define FOR_ALL_VHOST_TXQ(qid, vui) for (qid = 1; qid < vui->num_qid; qid += 2)
+
+#define FOR_ALL_VHOST_RXQ(qid, vui) for (qid = 0; qid < vui->num_qid; qid += 2)
+
+#define FOR_ALL_VHOST_RX_TXQ(qid, vui) for (qid = 0; qid < vui->num_qid; qid++)
+
typedef struct
{
uword dst;
@@ -323,6 +330,7 @@ typedef struct
u32 *to_next_list;
vlib_buffer_t **rx_buffers_pdesc;
+ u32 polling_q_count;
} vhost_cpu_t;
typedef struct
@@ -365,6 +373,8 @@ typedef struct
int vhost_user_dump_ifs (vnet_main_t * vnm, vlib_main_t * vm,
vhost_user_intf_details_t ** out_vuids);
+void vhost_user_set_operation_mode (vhost_user_intf_t *vui,
+ vhost_user_vring_t *txvq);
extern vlib_node_registration_t vhost_user_send_interrupt_node;
extern vnet_device_class_t vhost_user_device_class;
diff --git a/src/vnet/devices/virtio/vhost_user_output.c b/src/vnet/devices/virtio/vhost_user_output.c
index 40faefadb42..d3e38bfa04e 100644
--- a/src/vnet/devices/virtio/vhost_user_output.c
+++ b/src/vnet/devices/virtio/vhost_user_output.c
@@ -1046,7 +1046,24 @@ vhost_user_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index,
vhost_user_intf_t *vui =
pool_elt_at_index (vum->vhost_user_interfaces, hif->dev_instance);
vhost_user_vring_t *txvq = &vui->vrings[VHOST_VRING_IDX_TX (qid)];
+ vhost_cpu_t *cpu;
+ if (mode == txvq->mode)
+ return 0;
+
+ if ((mode != VNET_HW_IF_RX_MODE_POLLING) &&
+ (mode != VNET_HW_IF_RX_MODE_ADAPTIVE) &&
+ (mode != VNET_HW_IF_RX_MODE_INTERRUPT))
+ {
+ vu_log_err (vui, "unhandled mode %d changed for if %d queue %d", mode,
+ hw_if_index, qid);
+ return clib_error_return (0, "unsupported");
+ }
+
+ if (txvq->thread_index == ~0)
+ return clib_error_return (0, "Queue initialization is not finished yet");
+
+ cpu = vec_elt_at_index (vum->cpus, txvq->thread_index);
if ((mode == VNET_HW_IF_RX_MODE_INTERRUPT) ||
(mode == VNET_HW_IF_RX_MODE_ADAPTIVE))
{
@@ -1057,11 +1074,14 @@ vhost_user_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index,
}
if (txvq->mode == VNET_HW_IF_RX_MODE_POLLING)
{
+ ASSERT (cpu->polling_q_count != 0);
+ if (cpu->polling_q_count)
+ cpu->polling_q_count--;
vum->ifq_count++;
// Start the timer if this is the first encounter on interrupt
// interface/queue
if ((vum->ifq_count == 1) &&
- (vum->coalesce_time > 0.0) && (vum->coalesce_frames > 0))
+ ((vum->coalesce_time > 0.0) || (vum->coalesce_frames > 0)))
vlib_process_signal_event (vm,
vhost_user_send_interrupt_node.index,
VHOST_USER_EVENT_START_TIMER, 0);
@@ -1072,10 +1092,10 @@ vhost_user_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index,
if (((txvq->mode == VNET_HW_IF_RX_MODE_INTERRUPT) ||
(txvq->mode == VNET_HW_IF_RX_MODE_ADAPTIVE)) && vum->ifq_count)
{
+ cpu->polling_q_count++;
vum->ifq_count--;
// Stop the timer if there is no more interrupt interface/queue
- if ((vum->ifq_count == 0) &&
- (vum->coalesce_time > 0.0) && (vum->coalesce_frames > 0))
+ if (vum->ifq_count == 0)
vlib_process_signal_event (vm,
vhost_user_send_interrupt_node.index,
VHOST_USER_EVENT_STOP_TIMER, 0);
@@ -1083,17 +1103,7 @@ vhost_user_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index,
}
txvq->mode = mode;
- if (mode == VNET_HW_IF_RX_MODE_POLLING)
- txvq->used->flags = VRING_USED_F_NO_NOTIFY;
- else if ((mode == VNET_HW_IF_RX_MODE_ADAPTIVE) ||
- (mode == VNET_HW_IF_RX_MODE_INTERRUPT))
- txvq->used->flags = 0;
- else
- {
- vu_log_err (vui, "unhandled mode %d changed for if %d queue %d", mode,
- hw_if_index, qid);
- return clib_error_return (0, "unsupported");
- }
+ vhost_user_set_operation_mode (vui, txvq);
return 0;
}