From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: tiwei.bie@intel.com, zhihong.wang@intel.com,
jfreimann@redhat.com, dev@dpdk.org
Cc: mst@redhat.com, jasowang@redhat.com, wexu@redhat.com,
Maxime Coquelin <maxime.coquelin@redhat.com>
Subject: [dpdk-dev] [PATCH v5 14/15] vhost: add notification for packed ring
Date: Fri, 22 Jun 2018 15:43:26 +0200 [thread overview]
Message-ID: <20180622134327.18973-15-maxime.coquelin@redhat.com> (raw)
In-Reply-To: <20180622134327.18973-1-maxime.coquelin@redhat.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
lib/librte_vhost/vhost.c | 55 +++++++++++++++++++++++++++----
lib/librte_vhost/vhost.h | 71 ++++++++++++++++++++++++++++++++++++----
lib/librte_vhost/vhost_user.c | 29 +++++++++++++---
lib/librte_vhost/virtio-packed.h | 11 +++++++
lib/librte_vhost/virtio_net.c | 12 +++----
5 files changed, 154 insertions(+), 24 deletions(-)
diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
index 7cbf1eded..c26162542 100644
--- a/lib/librte_vhost/vhost.c
+++ b/lib/librte_vhost/vhost.c
@@ -595,7 +595,11 @@ rte_vhost_vring_call(int vid, uint16_t vring_idx)
if (!vq)
return -1;
- vhost_vring_call(dev, vq);
+ if (vq_is_packed(dev))
+ vhost_vring_call_packed(dev, vq);
+ else
+ vhost_vring_call_split(dev, vq);
+
return 0;
}
@@ -616,20 +620,59 @@ rte_vhost_avail_entries(int vid, uint16_t queue_id)
return *(volatile uint16_t *)&vq->avail->idx - vq->last_used_idx;
}
+static inline int
+vhost_enable_notify_split(struct vhost_virtqueue *vq, int enable)
+{
+ if (enable)
+ vq->used->flags &= ~VRING_USED_F_NO_NOTIFY;
+ else
+ vq->used->flags |= VRING_USED_F_NO_NOTIFY;
+
+ return 0;
+}
+
+static inline int
+vhost_enable_notify_packed(struct virtio_net *dev,
+ struct vhost_virtqueue *vq, int enable)
+{
+ uint16_t flags;
+
+ if (!enable) {
+ vq->device_event->desc_event_flags = RING_EVENT_FLAGS_DISABLE;
+ return 0;
+ }
+
+ flags = RING_EVENT_FLAGS_DISABLE;
+ if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX)) {
+ flags = RING_EVENT_FLAGS_DESC;
+ vq->device_event->desc_event_off_wrap = vq->last_avail_idx |
+ vq->avail_wrap_counter << 15;
+ }
+
+ rte_smp_wmb();
+
+ vq->device_event->desc_event_flags = flags;
+
+ rte_smp_wmb();
+
+ return 0;
+}
+
int
rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable)
{
struct virtio_net *dev = get_device(vid);
+ struct vhost_virtqueue *vq;
if (!dev)
return -1;
- if (enable)
- dev->virtqueue[queue_id]->used->flags &=
- ~VRING_USED_F_NO_NOTIFY;
+ vq = dev->virtqueue[queue_id];
+
+ if (vq_is_packed(dev))
+ return vhost_enable_notify_packed(dev, vq, enable);
else
- dev->virtqueue[queue_id]->used->flags |= VRING_USED_F_NO_NOTIFY;
- return 0;
+ return vhost_enable_notify_split(vq, enable);
}
void
diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index 5dcb61c71..99db688a8 100644
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -21,6 +21,7 @@
#include "rte_vhost.h"
#include "rte_vdpa.h"
+#include "virtio-packed.h"
/* Used to indicate that the device is running on a data core */
#define VIRTIO_DEV_RUNNING 1
@@ -95,8 +96,14 @@ struct vhost_virtqueue {
struct vring_desc *desc;
struct vring_desc_packed *desc_packed;
};
- struct vring_avail *avail;
- struct vring_used *used;
+ union {
+ struct vring_avail *avail;
+ struct vring_packed_desc_event *driver_event;
+ };
+ union {
+ struct vring_used *used;
+ struct vring_packed_desc_event *device_event;
+ };
uint32_t size;
uint16_t last_avail_idx;
@@ -614,7 +621,7 @@ vhost_need_event(uint16_t event_idx, uint16_t new_idx, uint16_t old)
}
static __rte_always_inline void
-vhost_vring_call(struct virtio_net *dev, struct vhost_virtqueue *vq)
+vhost_vring_call_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
{
/* Flush used->idx update before we read avail->flags. */
rte_mb();
@@ -625,11 +632,11 @@ vhost_vring_call(struct virtio_net *dev, struct vhost_virtqueue *vq)
uint16_t new = vq->last_used_idx;
VHOST_LOG_DEBUG(VHOST_DATA, "%s: used_event_idx=%d, old=%d, new=%d\n",
- __func__,
- vhost_used_event(vq),
- old, new);
+ __func__,
+ vhost_used_event(vq),
+ old, new);
if (vhost_need_event(vhost_used_event(vq), new, old)
- && (vq->callfd >= 0)) {
+ && (vq->callfd >= 0)) {
vq->signalled_used = vq->last_used_idx;
eventfd_write(vq->callfd, (eventfd_t) 1);
}
@@ -641,4 +648,54 @@ vhost_vring_call(struct virtio_net *dev, struct vhost_virtqueue *vq)
}
}
+static __rte_always_inline void
+vhost_vring_call_packed(struct virtio_net *dev, struct vhost_virtqueue *vq)
+{
+ uint16_t old, new, off, off_wrap, wrap;
+ bool kick = false;
+
+
+ /* Flush used desc update. */
+ rte_smp_mb();
+
+ if (!(dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))) {
+ if (vq->driver_event->desc_event_flags !=
+ RING_EVENT_FLAGS_DISABLE)
+ kick = true;
+ goto kick;
+ }
+
+ old = vq->signalled_used;
+ new = vq->last_used_idx;
+ vq->signalled_used = new;
+
+ if (vq->driver_event->desc_event_flags != RING_EVENT_FLAGS_DESC) {
+ if (vq->driver_event->desc_event_flags !=
+ RING_EVENT_FLAGS_DISABLE)
+ kick = true;
+ goto kick;
+ }
+
+ rte_smp_rmb();
+
+ off_wrap = vq->driver_event->desc_event_off_wrap;
+ off = off_wrap & ~(1 << 15);
+ wrap = vq->used_wrap_counter;
+
+ if (new < old) {
+ new += vq->size;
+ wrap ^= 1;
+ }
+
+ if (wrap != off_wrap >> 15)
+ off += vq->size;
+
+ if (vhost_need_event(off, new, old))
+ kick = true;
+
+kick:
+ if (kick)
+ eventfd_write(vq->callfd, (eventfd_t)1);
+}
+
#endif /* _VHOST_NET_CDEV_H_ */
diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index a08d99314..c74924564 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -509,9 +509,6 @@ translate_ring_addresses(struct virtio_net *dev, int vq_index)
len = sizeof(struct vring_desc_packed) * vq->size;
vq->desc_packed = (struct vring_desc_packed *) ring_addr_to_vva
(dev, vq, addr->desc_user_addr, &len);
- vq->desc = NULL;
- vq->avail = NULL;
- vq->used = NULL;
vq->log_guest_addr = 0;
if (vq->desc_packed == 0 ||
len != sizeof(struct vring_desc_packed) *
@@ -526,6 +523,30 @@ translate_ring_addresses(struct virtio_net *dev, int vq_index)
vq = dev->virtqueue[vq_index];
addr = &vq->ring_addrs;
+ len = sizeof(struct vring_packed_desc_event);
+ vq->driver_event = (struct vring_packed_desc_event *)
+ (uintptr_t)ring_addr_to_vva(dev,
+ vq, addr->avail_user_addr, &len);
+ if (vq->driver_event == 0 ||
+ len != sizeof(struct vring_packed_desc_event)) {
+ RTE_LOG(DEBUG, VHOST_CONFIG,
+ "(%d) failed to find driver area address.\n",
+ dev->vid);
+ return dev;
+ }
+
+ len = sizeof(struct vring_packed_desc_event);
+ vq->device_event = (struct vring_packed_desc_event *)
+ (uintptr_t)ring_addr_to_vva(dev,
+ vq, addr->used_user_addr, &len);
+ if (vq->device_event == 0 ||
+ len != sizeof(struct vring_packed_desc_event)) {
+ RTE_LOG(DEBUG, VHOST_CONFIG,
+ "(%d) failed to find device area address.\n",
+ dev->vid);
+ return dev;
+ }
+
return dev;
}
@@ -542,8 +563,6 @@ translate_ring_addresses(struct virtio_net *dev, int vq_index)
dev->vid);
return dev;
}
- vq->desc_packed = NULL;
-
dev = numa_realloc(dev, vq_index);
vq = dev->virtqueue[vq_index];
addr = &vq->ring_addrs;
diff --git a/lib/librte_vhost/virtio-packed.h b/lib/librte_vhost/virtio-packed.h
index 21fe5045b..f271249d8 100644
--- a/lib/librte_vhost/virtio-packed.h
+++ b/lib/librte_vhost/virtio-packed.h
@@ -19,6 +19,17 @@ struct vring_desc_packed {
uint16_t flags;
};
+#define RING_EVENT_FLAGS_ENABLE 0x0
+#define RING_EVENT_FLAGS_DISABLE 0x1
+#define RING_EVENT_FLAGS_DESC 0x2
+#define RING_EVENT_FLAGS_MASK 0xFFFC
+#define RING_EVENT_WRAP_MASK 0x8000
+#define RING_EVENT_OFF_MASK 0x7FFF
+
+struct vring_packed_desc_event {
+ uint16_t desc_event_off_wrap;
+ uint16_t desc_event_flags;
+};
static inline int
desc_is_avail(struct vring_desc_packed *desc, uint16_t wrap_counter)
diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index b9f49175c..9e8c9969b 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -822,7 +822,7 @@ virtio_dev_rx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
if (likely(vq->shadow_used_idx)) {
flush_shadow_used_ring_split(dev, vq);
- vhost_vring_call(dev, vq);
+ vhost_vring_call_split(dev, vq);
}
return pkt_idx;
@@ -875,7 +875,7 @@ virtio_dev_rx_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
if (likely(vq->shadow_used_idx)) {
flush_shadow_used_ring_packed(dev, vq);
- vhost_vring_call(dev, vq);
+ vhost_vring_call_packed(dev, vq);
}
return pkt_idx;
@@ -1358,7 +1358,7 @@ virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
}
flush_shadow_used_ring_split(dev, vq);
- vhost_vring_call(dev, vq);
+ vhost_vring_call_split(dev, vq);
}
rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
@@ -1437,7 +1437,7 @@ virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
if (unlikely(i < count))
vq->shadow_used_idx = i;
flush_shadow_used_ring_split(dev, vq);
- vhost_vring_call(dev, vq);
+ vhost_vring_call_split(dev, vq);
}
return i;
@@ -1475,7 +1475,7 @@ virtio_dev_tx_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
}
flush_shadow_used_ring_packed(dev, vq);
- vhost_vring_call(dev, vq);
+ vhost_vring_call_packed(dev, vq);
}
VHOST_LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__);
@@ -1553,7 +1553,7 @@ virtio_dev_tx_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
if (unlikely(i < count))
vq->shadow_used_idx = i;
flush_shadow_used_ring_packed(dev, vq);
- vhost_vring_call(dev, vq);
+ vhost_vring_call_packed(dev, vq);
}
return i;
--
2.14.4
next prev parent reply other threads:[~2018-06-22 13:44 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-22 13:43 [dpdk-dev] [PATCH v5 00/15] Vhost: add support to packed ring layout Maxime Coquelin
2018-06-22 13:43 ` [dpdk-dev] [PATCH v5 01/15] vhost: add virtio packed virtqueue defines Maxime Coquelin
2018-06-29 15:47 ` Tiwei Bie
2018-06-29 16:20 ` Maxime Coquelin
2018-06-22 13:43 ` [dpdk-dev] [PATCH v5 02/15] vhost: add helpers for packed virtqueues Maxime Coquelin
2018-06-29 15:51 ` Tiwei Bie
2018-06-29 16:21 ` Maxime Coquelin
2018-06-22 13:43 ` [dpdk-dev] [PATCH v5 03/15] vhost: vring address setup for packed queues Maxime Coquelin
2018-06-29 15:59 ` Tiwei Bie
2018-06-29 16:34 ` Maxime Coquelin
2018-06-30 2:18 ` Tiwei Bie
2018-07-01 9:58 ` Maxime Coquelin
2018-06-22 13:43 ` [dpdk-dev] [PATCH v5 04/15] vhost: clear shadow used table index at flush time Maxime Coquelin
2018-06-22 13:43 ` [dpdk-dev] [PATCH v5 05/15] vhost: make indirect desc table copy desc type agnostic Maxime Coquelin
2018-06-22 13:43 ` [dpdk-dev] [PATCH v5 06/15] vhost: clear batch copy index at copy time Maxime Coquelin
2018-06-22 13:43 ` [dpdk-dev] [PATCH v5 07/15] vhost: extract split ring handling from Rx and Tx functions Maxime Coquelin
2018-06-22 13:43 ` [dpdk-dev] [PATCH v5 08/15] vhost: append shadow used ring function names with split Maxime Coquelin
2018-06-22 13:43 ` [dpdk-dev] [PATCH v5 09/15] vhost: add shadow used ring support for packed rings Maxime Coquelin
2018-06-29 16:08 ` Tiwei Bie
2018-06-22 13:43 ` [dpdk-dev] [PATCH v5 10/15] vhost: create descriptor mapping function Maxime Coquelin
2018-06-22 13:43 ` [dpdk-dev] [PATCH v5 11/15] vhost: add vector filling support for packed ring Maxime Coquelin
2018-06-22 13:43 ` [dpdk-dev] [PATCH v5 12/15] vhost: add Rx " Maxime Coquelin
2018-06-22 13:43 ` [dpdk-dev] [PATCH v5 13/15] vhost: add Tx " Maxime Coquelin
2018-06-22 13:43 ` Maxime Coquelin [this message]
2018-06-29 16:22 ` [dpdk-dev] [PATCH v5 14/15] vhost: add notification " Tiwei Bie
2018-06-22 13:43 ` [dpdk-dev] [PATCH v5 15/15] vhost: advertize packed ring layout support Maxime Coquelin
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