* [dpdk-dev] [PATCH v8 0/8] implement packed virtqueues
@ 2018-10-16 9:01 Jens Freimann
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 1/8] net/virtio: vring init for packed queues Jens Freimann
` (7 more replies)
0 siblings, 8 replies; 10+ messages in thread
From: Jens Freimann @ 2018-10-16 9:01 UTC (permalink / raw)
To: dev; +Cc: tiwei.bie, maxime.coquelin, Gavin.Hu
This is a basic implementation of packed virtqueues as specified in the
Virtio 1.1 draft. A compiled version of the current draft is available
at https://github.com/oasis-tcs/virtio-docs.git (or as .pdf at
https://github.com/oasis-tcs/virtio-docs/blob/master/virtio-v1.1-packed-wd10.pdf
A packed virtqueue is different from a split virtqueue in that it
consists of only a single descriptor ring that replaces available and
used ring, index and descriptor pointers.
Each descriptor is readable and writable and has a flags field. These flags
will mark if a descriptor is available or used. To detect new available descriptors
even after the ring has wrapped, device and driver each have a
single-bit wrap counter that is flipped from 0 to 1 and vice versa every time
the last descriptor in the ring is used/made available.
v7->v8:
* move desc_is_used change to correct patch
* remove trailing newline
* correct xmit code, flags update and memory barrier
* move packed desc init to dedicated function, split
and packed variant
Jens Freimann (8):
net/virtio: vring init for packed queues
net/virtio: add packed virtqueue defines
net/virtio: add packed virtqueue helpers
net/virtio: dump packed virtqueue data
net/virtio: implement transmit path for packed queues
net/virtio: implement receive path for packed queues
net/virtio: add virtio send command packed queue support
net/virtio: enable packed virtqueues by default
drivers/net/virtio/virtio_ethdev.c | 154 ++++++--
drivers/net/virtio/virtio_ethdev.h | 5 +
drivers/net/virtio/virtio_pci.h | 7 +
drivers/net/virtio/virtio_ring.h | 110 +++++-
drivers/net/virtio/virtio_rxtx.c | 545 +++++++++++++++++++++++++++--
drivers/net/virtio/virtqueue.c | 23 ++
drivers/net/virtio/virtqueue.h | 42 ++-
7 files changed, 832 insertions(+), 54 deletions(-)
--
2.17.1
^ permalink raw reply [flat|nested] 10+ messages in thread
* [dpdk-dev] [PATCH v8 1/8] net/virtio: vring init for packed queues
2018-10-16 9:01 [dpdk-dev] [PATCH v8 0/8] implement packed virtqueues Jens Freimann
@ 2018-10-16 9:01 ` Jens Freimann
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 2/8] net/virtio: add packed virtqueue defines Jens Freimann
` (6 subsequent siblings)
7 siblings, 0 replies; 10+ messages in thread
From: Jens Freimann @ 2018-10-16 9:01 UTC (permalink / raw)
To: dev; +Cc: tiwei.bie, maxime.coquelin, Gavin.Hu
Add and initialize descriptor data structures.
Signed-off-by: Jens Freimann <jfreimann@redhat.com>
---
drivers/net/virtio/virtio_ethdev.c | 18 ++++----
drivers/net/virtio/virtio_pci.h | 7 +++
drivers/net/virtio/virtio_ring.h | 74 ++++++++++++++++++++++++++----
drivers/net/virtio/virtqueue.h | 15 +++++-
4 files changed, 95 insertions(+), 19 deletions(-)
diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index b81df0a99..873b345b3 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -299,19 +299,21 @@ virtio_init_vring(struct virtqueue *vq)
PMD_INIT_FUNC_TRACE();
- /*
- * Reinitialise since virtio port might have been stopped and restarted
- */
memset(ring_mem, 0, vq->vq_ring_size);
- vring_init(vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN);
+ vring_init(vq->hw, vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN);
+
vq->vq_used_cons_idx = 0;
vq->vq_desc_head_idx = 0;
vq->vq_avail_idx = 0;
vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1);
vq->vq_free_cnt = vq->vq_nentries;
memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries);
-
- vring_desc_init(vr->desc, size);
+ if (vtpci_packed_queue(vq->hw)) {
+ if (!vtpci_with_feature(vq->hw, VIRTIO_F_IN_ORDER))
+ vring_desc_init_packed(vq, size);
+ } else {
+ vring_desc_init_split(vr->desc, size);
+ }
/*
* Disable device(host) interrupting guest
@@ -386,7 +388,7 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t vtpci_queue_idx)
/*
* Reserve a memzone for vring elements
*/
- size = vring_size(vq_size, VIRTIO_PCI_VRING_ALIGN);
+ size = vring_size(hw, vq_size, VIRTIO_PCI_VRING_ALIGN);
vq->vq_ring_size = RTE_ALIGN_CEIL(size, VIRTIO_PCI_VRING_ALIGN);
PMD_INIT_LOG(DEBUG, "vring_size: %d, rounded_vring_size: %d",
size, vq->vq_ring_size);
@@ -489,7 +491,7 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t vtpci_queue_idx)
for (i = 0; i < vq_size; i++) {
struct vring_desc *start_dp = txr[i].tx_indir;
- vring_desc_init(start_dp, RTE_DIM(txr[i].tx_indir));
+ vring_desc_init_split(start_dp, RTE_DIM(txr[i].tx_indir));
/* first indirect descriptor is always the tx header */
start_dp->addr = txvq->virtio_net_hdr_mem
diff --git a/drivers/net/virtio/virtio_pci.h b/drivers/net/virtio/virtio_pci.h
index 58fdd3d45..c487d2be0 100644
--- a/drivers/net/virtio/virtio_pci.h
+++ b/drivers/net/virtio/virtio_pci.h
@@ -113,6 +113,7 @@ struct virtnet_ctl;
#define VIRTIO_F_VERSION_1 32
#define VIRTIO_F_IOMMU_PLATFORM 33
+#define VIRTIO_F_RING_PACKED 34
/*
* Some VirtIO feature bits (currently bits 28 through 31) are
@@ -314,6 +315,12 @@ vtpci_with_feature(struct virtio_hw *hw, uint64_t bit)
return (hw->guest_features & (1ULL << bit)) != 0;
}
+static inline int
+vtpci_packed_queue(struct virtio_hw *hw)
+{
+ return vtpci_with_feature(hw, VIRTIO_F_RING_PACKED);
+}
+
/*
* Function declaration from virtio_pci.c
*/
diff --git a/drivers/net/virtio/virtio_ring.h b/drivers/net/virtio/virtio_ring.h
index 9e3c2a015..e65da100b 100644
--- a/drivers/net/virtio/virtio_ring.h
+++ b/drivers/net/virtio/virtio_ring.h
@@ -54,11 +54,38 @@ struct vring_used {
struct vring_used_elem ring[0];
};
+/* For support of packed virtqueues in Virtio 1.1 the format of descriptors
+ * looks like this.
+ */
+struct vring_desc_packed {
+ uint64_t addr;
+ uint32_t len;
+ uint16_t index;
+ uint16_t flags;
+} __attribute__ ((aligned(16)));
+
+#define RING_EVENT_FLAGS_ENABLE 0x0
+#define RING_EVENT_FLAGS_DISABLE 0x1
+#define RING_EVENT_FLAGS_DESC 0x2
+struct vring_packed_desc_event {
+ uint16_t desc_event_off_wrap;
+ uint16_t desc_event_flags;
+};
+
struct vring {
unsigned int num;
- struct vring_desc *desc;
- struct vring_avail *avail;
- struct vring_used *used;
+ union {
+ struct vring_desc_packed *desc_packed;
+ struct vring_desc *desc;
+ };
+ union {
+ struct vring_avail *avail;
+ struct vring_packed_desc_event *driver_event;
+ };
+ union {
+ struct vring_used *used;
+ struct vring_packed_desc_event *device_event;
+ };
};
/* The standard layout for the ring is a continuous chunk of memory which
@@ -95,10 +122,18 @@ struct vring {
#define vring_avail_event(vr) (*(uint16_t *)&(vr)->used->ring[(vr)->num])
static inline size_t
-vring_size(unsigned int num, unsigned long align)
+vring_size(struct virtio_hw *hw, unsigned int num, unsigned long align)
{
size_t size;
+ if (vtpci_packed_queue(hw)) {
+ size = num * sizeof(struct vring_desc_packed);
+ size += sizeof(struct vring_packed_desc_event);
+ size = RTE_ALIGN_CEIL(size, align);
+ size += sizeof(struct vring_packed_desc_event);
+ return size;
+ }
+
size = num * sizeof(struct vring_desc);
size += sizeof(struct vring_avail) + (num * sizeof(uint16_t));
size = RTE_ALIGN_CEIL(size, align);
@@ -106,17 +141,36 @@ vring_size(unsigned int num, unsigned long align)
(num * sizeof(struct vring_used_elem));
return size;
}
-
static inline void
-vring_init(struct vring *vr, unsigned int num, uint8_t *p,
- unsigned long align)
+vring_init_split(struct vring *vr, uint8_t *p, unsigned long align)
{
- vr->num = num;
vr->desc = (struct vring_desc *) p;
vr->avail = (struct vring_avail *) (p +
- num * sizeof(struct vring_desc));
+ vr->num * sizeof(struct vring_desc));
vr->used = (void *)
- RTE_ALIGN_CEIL((uintptr_t)(&vr->avail->ring[num]), align);
+ RTE_ALIGN_CEIL((uintptr_t)(&vr->avail->ring[vr->num]), align);
+}
+
+static inline void
+vring_init_packed(struct vring *vr, uint8_t *p, unsigned long align)
+{
+ vr->desc_packed = (struct vring_desc_packed *)p;
+ vr->driver_event = (struct vring_packed_desc_event *)(p +
+ vr->num * sizeof(struct vring_desc_packed));
+ vr->device_event = (struct vring_packed_desc_event *)
+ RTE_ALIGN_CEIL((uintptr_t)(vr->driver_event +
+ sizeof(struct vring_packed_desc_event)), align);
+}
+
+static inline void
+vring_init(struct virtio_hw *hw, struct vring *vr, unsigned int num, uint8_t *p,
+ unsigned long align)
+{
+ vr->num = num;
+ if (vtpci_packed_queue(hw))
+ vring_init_packed(vr, p, align);
+ else
+ vring_init_split(vr, p, align);
}
/*
diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
index 26518ed98..3d512fe30 100644
--- a/drivers/net/virtio/virtqueue.h
+++ b/drivers/net/virtio/virtqueue.h
@@ -161,6 +161,7 @@ struct virtio_pmd_ctrl {
struct vq_desc_extra {
void *cookie;
uint16_t ndescs;
+ uint16_t next;
};
struct virtqueue {
@@ -245,9 +246,21 @@ struct virtio_tx_region {
__attribute__((__aligned__(16)));
};
+static inline void
+vring_desc_init_packed(struct virtqueue *vq, int n)
+{
+ int i;
+ for (i = 0; i < n - 1; i++) {
+ vq->vq_ring.desc_packed[i].index = i;
+ vq->vq_descx[i].next = i + 1;
+ }
+ vq->vq_ring.desc_packed[i].index = i;
+ vq->vq_descx[i].next = VQ_RING_DESC_CHAIN_END;
+}
+
/* Chain all the descriptors in the ring with an END */
static inline void
-vring_desc_init(struct vring_desc *dp, uint16_t n)
+vring_desc_init_split(struct vring_desc *dp, uint16_t n)
{
uint16_t i;
--
2.17.1
^ permalink raw reply [flat|nested] 10+ messages in thread
* [dpdk-dev] [PATCH v8 2/8] net/virtio: add packed virtqueue defines
2018-10-16 9:01 [dpdk-dev] [PATCH v8 0/8] implement packed virtqueues Jens Freimann
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 1/8] net/virtio: vring init for packed queues Jens Freimann
@ 2018-10-16 9:01 ` Jens Freimann
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 3/8] net/virtio: add packed virtqueue helpers Jens Freimann
` (5 subsequent siblings)
7 siblings, 0 replies; 10+ messages in thread
From: Jens Freimann @ 2018-10-16 9:01 UTC (permalink / raw)
To: dev; +Cc: tiwei.bie, maxime.coquelin, Gavin.Hu
Signed-off-by: Jens Freimann <jfreimann@redhat.com>
---
drivers/net/virtio/virtio_ring.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/net/virtio/virtio_ring.h b/drivers/net/virtio/virtio_ring.h
index e65da100b..f84ab5e34 100644
--- a/drivers/net/virtio/virtio_ring.h
+++ b/drivers/net/virtio/virtio_ring.h
@@ -15,7 +15,10 @@
#define VRING_DESC_F_WRITE 2
/* This means the buffer contains a list of buffer descriptors. */
#define VRING_DESC_F_INDIRECT 4
-
+/* This flag means the descriptor was made available by the driver */
+#define VRING_DESC_F_AVAIL(b) ((uint16_t)(b) << 7)
+/* This flag means the descriptor was used by the device */
+#define VRING_DESC_F_USED(b) ((uint16_t)(b) << 15)
/* The Host uses this in used->flags to advise the Guest: don't kick me
* when you add a buffer. It's unreliable, so it's simply an
* optimization. Guest will still kick if it's out of buffers. */
--
2.17.1
^ permalink raw reply [flat|nested] 10+ messages in thread
* [dpdk-dev] [PATCH v8 3/8] net/virtio: add packed virtqueue helpers
2018-10-16 9:01 [dpdk-dev] [PATCH v8 0/8] implement packed virtqueues Jens Freimann
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 1/8] net/virtio: vring init for packed queues Jens Freimann
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 2/8] net/virtio: add packed virtqueue defines Jens Freimann
@ 2018-10-16 9:01 ` Jens Freimann
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 4/8] net/virtio: dump packed virtqueue data Jens Freimann
` (4 subsequent siblings)
7 siblings, 0 replies; 10+ messages in thread
From: Jens Freimann @ 2018-10-16 9:01 UTC (permalink / raw)
To: dev; +Cc: tiwei.bie, maxime.coquelin, Gavin.Hu
Add helper functions to set/clear and check descriptor flags.
Signed-off-by: Jens Freimann <jfreimann@redhat.com>
---
drivers/net/virtio/virtio_ring.h | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/drivers/net/virtio/virtio_ring.h b/drivers/net/virtio/virtio_ring.h
index f84ab5e34..44cb6eb04 100644
--- a/drivers/net/virtio/virtio_ring.h
+++ b/drivers/net/virtio/virtio_ring.h
@@ -77,6 +77,8 @@ struct vring_packed_desc_event {
struct vring {
unsigned int num;
+ unsigned int avail_wrap_counter;
+ unsigned int used_wrap_counter;
union {
struct vring_desc_packed *desc_packed;
struct vring_desc *desc;
@@ -91,6 +93,35 @@ struct vring {
};
};
+static inline void
+_set_desc_avail(struct vring_desc_packed *desc, int wrap_counter)
+{
+ desc->flags |= VRING_DESC_F_AVAIL(wrap_counter) |
+ VRING_DESC_F_USED(!wrap_counter);
+}
+
+static inline void
+set_desc_avail(struct vring *vr, struct vring_desc_packed *desc)
+{
+ _set_desc_avail(desc, vr->avail_wrap_counter);
+}
+
+static inline int
+desc_is_used(struct vring_desc_packed *desc, struct vring *vr)
+{
+ uint16_t used, avail, flags;
+ bool is_used;
+
+ rte_smp_mb();
+ flags = desc->flags;
+ avail = !!(flags & VRING_DESC_F_AVAIL(1));
+ used = !!(flags & VRING_DESC_F_USED(1));
+ is_used = used == avail && used == vr->used_wrap_counter;
+ rte_smp_rmb();
+
+ return is_used;
+}
+
/* The standard layout for the ring is a continuous chunk of memory which
* looks like this. We assume num is a power of 2.
*
--
2.17.1
^ permalink raw reply [flat|nested] 10+ messages in thread
* [dpdk-dev] [PATCH v8 4/8] net/virtio: dump packed virtqueue data
2018-10-16 9:01 [dpdk-dev] [PATCH v8 0/8] implement packed virtqueues Jens Freimann
` (2 preceding siblings ...)
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 3/8] net/virtio: add packed virtqueue helpers Jens Freimann
@ 2018-10-16 9:01 ` Jens Freimann
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 5/8] net/virtio: implement transmit path for packed queues Jens Freimann
` (3 subsequent siblings)
7 siblings, 0 replies; 10+ messages in thread
From: Jens Freimann @ 2018-10-16 9:01 UTC (permalink / raw)
To: dev; +Cc: tiwei.bie, maxime.coquelin, Gavin.Hu
Add support to dump packed virtqueue data to the
VIRTQUEUE_DUMP() macro.
Signed-off-by: Jens Freimann <jfreimann@redhat.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
drivers/net/virtio/virtqueue.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
index 3d512fe30..2af1bc259 100644
--- a/drivers/net/virtio/virtqueue.h
+++ b/drivers/net/virtio/virtqueue.h
@@ -368,6 +368,15 @@ virtqueue_notify(struct virtqueue *vq)
uint16_t used_idx, nused; \
used_idx = (vq)->vq_ring.used->idx; \
nused = (uint16_t)(used_idx - (vq)->vq_used_cons_idx); \
+ if (vtpci_packed_queue((vq)->hw)) { \
+ PMD_INIT_LOG(DEBUG, \
+ "VQ: - size=%d; free=%d; used_cons_idx=%d; avail_idx=%d;" \
+ "VQ: - avail_wrap_counter=%d; used_wrap_counter=%d", \
+ (vq)->vq_nentries, (vq)->vq_free_cnt, (vq)->vq_used_cons_idx, \
+ (vq)->vq_avail_idx, (vq)->vq_ring.avail_wrap_counter, \
+ (vq)->vq_ring.used_wrap_counter); \
+ break; \
+ } \
PMD_INIT_LOG(DEBUG, \
"VQ: - size=%d; free=%d; used=%d; desc_head_idx=%d;" \
" avail.idx=%d; used_cons_idx=%d; used.idx=%d;" \
--
2.17.1
^ permalink raw reply [flat|nested] 10+ messages in thread
* [dpdk-dev] [PATCH v8 5/8] net/virtio: implement transmit path for packed queues
2018-10-16 9:01 [dpdk-dev] [PATCH v8 0/8] implement packed virtqueues Jens Freimann
` (3 preceding siblings ...)
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 4/8] net/virtio: dump packed virtqueue data Jens Freimann
@ 2018-10-16 9:01 ` Jens Freimann
2018-10-18 4:43 ` Tiwei Bie
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 6/8] net/virtio: implement receive " Jens Freimann
` (2 subsequent siblings)
7 siblings, 1 reply; 10+ messages in thread
From: Jens Freimann @ 2018-10-16 9:01 UTC (permalink / raw)
To: dev; +Cc: tiwei.bie, maxime.coquelin, Gavin.Hu
This implements the transmit path for devices with
support for packed virtqueues.
Signed-off-by: Jens Freiman <jfreimann@redhat.com>
---
drivers/net/virtio/virtio_ethdev.c | 32 ++--
drivers/net/virtio/virtio_ethdev.h | 2 +
drivers/net/virtio/virtio_rxtx.c | 276 +++++++++++++++++++++++++++++
drivers/net/virtio/virtqueue.h | 18 +-
4 files changed, 316 insertions(+), 12 deletions(-)
diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 873b345b3..14cf3657e 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -384,6 +384,8 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t vtpci_queue_idx)
vq->hw = hw;
vq->vq_queue_index = vtpci_queue_idx;
vq->vq_nentries = vq_size;
+ if (vtpci_packed_queue(hw))
+ vq->vq_ring.avail_wrap_counter = 1;
/*
* Reserve a memzone for vring elements
@@ -490,16 +492,22 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t vtpci_queue_idx)
memset(txr, 0, vq_size * sizeof(*txr));
for (i = 0; i < vq_size; i++) {
struct vring_desc *start_dp = txr[i].tx_indir;
-
- vring_desc_init_split(start_dp, RTE_DIM(txr[i].tx_indir));
-
+ struct vring_desc_packed*start_dp_packed = txr[i].tx_indir_pq;
+
/* first indirect descriptor is always the tx header */
- start_dp->addr = txvq->virtio_net_hdr_mem
- + i * sizeof(*txr)
- + offsetof(struct virtio_tx_region, tx_hdr);
-
- start_dp->len = hw->vtnet_hdr_size;
- start_dp->flags = VRING_DESC_F_NEXT;
+ if (vtpci_packed_queue(hw)) {
+ start_dp_packed->addr = txvq->virtio_net_hdr_mem
+ + i * sizeof(*txr)
+ + offsetof(struct virtio_tx_region, tx_hdr);
+ start_dp_packed->len = hw->vtnet_hdr_size;
+ } else {
+ vring_desc_init_split(start_dp, RTE_DIM(txr[i].tx_indir));
+ start_dp->addr = txvq->virtio_net_hdr_mem
+ + i * sizeof(*txr)
+ + offsetof(struct virtio_tx_region, tx_hdr);
+ start_dp->len = hw->vtnet_hdr_size;
+ start_dp->flags = VRING_DESC_F_NEXT;
+ }
}
}
@@ -1338,7 +1346,11 @@ set_rxtx_funcs(struct rte_eth_dev *eth_dev)
eth_dev->rx_pkt_burst = &virtio_recv_pkts;
}
- if (hw->use_inorder_tx) {
+ if (vtpci_packed_queue(hw)) {
+ PMD_INIT_LOG(INFO, "virtio: using virtio 1.1 Tx path on port %u",
+ eth_dev->data->port_id);
+ eth_dev->tx_pkt_burst = virtio_xmit_pkts_packed;
+ } else if (hw->use_inorder_tx) {
PMD_INIT_LOG(INFO, "virtio: using inorder Tx path on port %u",
eth_dev->data->port_id);
eth_dev->tx_pkt_burst = virtio_xmit_pkts_inorder;
diff --git a/drivers/net/virtio/virtio_ethdev.h b/drivers/net/virtio/virtio_ethdev.h
index e0f80e5a4..05d355180 100644
--- a/drivers/net/virtio/virtio_ethdev.h
+++ b/drivers/net/virtio/virtio_ethdev.h
@@ -82,6 +82,8 @@ uint16_t virtio_recv_mergeable_pkts_inorder(void *rx_queue,
uint16_t virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
uint16_t nb_pkts);
+uint16_t virtio_xmit_pkts_packed(void *tx_queue, struct rte_mbuf **tx_pkts,
+ uint16_t nb_pkts);
uint16_t virtio_xmit_pkts_inorder(void *tx_queue, struct rte_mbuf **tx_pkts,
uint16_t nb_pkts);
diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c
index eb891433e..0c17102c3 100644
--- a/drivers/net/virtio/virtio_rxtx.c
+++ b/drivers/net/virtio/virtio_rxtx.c
@@ -88,6 +88,41 @@ vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
dp->next = VQ_RING_DESC_CHAIN_END;
}
+void
+vq_ring_free_chain_packed(struct virtqueue *vq, uint16_t desc_idx)
+{
+ struct vring_desc_packed *dp;
+ struct vq_desc_extra *dxp = NULL, *dxp_tail = NULL;
+ uint16_t desc_idx_last = desc_idx;
+
+ dp = &vq->vq_ring.desc_packed[desc_idx];
+ dxp = &vq->vq_descx[desc_idx];
+ vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs);
+ if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) {
+ while (dp->flags & VRING_DESC_F_NEXT) {
+ desc_idx_last = dxp->next;
+ dp = &vq->vq_ring.desc_packed[dxp->next];
+ dxp = &vq->vq_descx[dxp->next];
+ }
+ }
+
+ /*
+ * We must append the existing free chain, if any, to the end of
+ * newly freed chain. If the virtqueue was completely used, then
+ * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above).
+ */
+ if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) {
+ vq->vq_desc_head_idx = desc_idx;
+ }
+ else {
+ dxp_tail = &vq->vq_descx[vq->vq_desc_tail_idx];
+ dxp_tail->next = desc_idx;
+ }
+
+ vq->vq_desc_tail_idx = desc_idx_last;
+ dxp->next = VQ_RING_DESC_CHAIN_END;
+}
+
static uint16_t
virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
uint32_t *len, uint16_t num)
@@ -165,6 +200,33 @@ virtqueue_dequeue_rx_inorder(struct virtqueue *vq,
#endif
/* Cleanup from completed transmits. */
+static void
+virtio_xmit_cleanup_packed(struct virtqueue *vq)
+{
+ uint16_t used_idx, id;
+ uint16_t size = vq->vq_nentries;
+ struct vring_desc_packed *desc = vq->vq_ring.desc_packed;
+ struct vq_desc_extra *dxp;
+
+ used_idx = vq->vq_used_cons_idx;
+ while (desc_is_used(&desc[used_idx], &vq->vq_ring) &&
+ vq->vq_free_cnt < size) {
+ used_idx = vq->vq_used_cons_idx;
+ id = desc[used_idx].index;
+ dxp = &vq->vq_descx[id];
+ if (++vq->vq_used_cons_idx >= size) {
+ vq->vq_used_cons_idx -= size;
+ vq->vq_ring.used_wrap_counter ^= 1;
+ }
+ vq_ring_free_chain_packed(vq, id);
+ if (dxp->cookie != NULL) {
+ rte_pktmbuf_free(dxp->cookie);
+ dxp->cookie = NULL;
+ }
+ used_idx = vq->vq_used_cons_idx;
+ }
+}
+
static void
virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num)
{
@@ -456,6 +518,129 @@ virtqueue_enqueue_xmit_inorder(struct virtnet_tx *txvq,
vq->vq_desc_head_idx = idx & (vq->vq_nentries - 1);
}
+static inline void
+virtqueue_enqueue_xmit_packed(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
+ uint16_t needed, int use_indirect, int can_push,
+ int in_order)
+{
+ struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
+ struct vq_desc_extra *dxp, *head_dxp;
+ struct virtqueue *vq = txvq->vq;
+ struct vring_desc_packed *start_dp, *head_dp;
+ uint16_t seg_num = cookie->nb_segs;
+ uint16_t idx, head_id, head_flags;
+ uint16_t head_size = vq->hw->vtnet_hdr_size;
+ struct virtio_net_hdr *hdr;
+
+ head_id = vq->vq_desc_head_idx;
+ idx = head_id;
+ start_dp = vq->vq_ring.desc_packed;
+ dxp = &vq->vq_descx[idx];
+ dxp->ndescs = needed;
+
+ head_dp = &vq->vq_ring.desc_packed[head_id];
+ head_dxp = &vq->vq_descx[head_id];
+ head_dxp->cookie = (void *) cookie;
+ head_flags = cookie->next ? VRING_DESC_F_NEXT: 0;
+ head_flags = VRING_DESC_F_AVAIL(vq->vq_ring.avail_wrap_counter) |
+ VRING_DESC_F_USED(!vq->vq_ring.avail_wrap_counter);
+
+ if (can_push) {
+ /* prepend cannot fail, checked by caller */
+ hdr = (struct virtio_net_hdr *)
+ rte_pktmbuf_prepend(cookie, head_size);
+ /* rte_pktmbuf_prepend() counts the hdr size to the pkt length,
+ * which is wrong. Below subtract restores correct pkt size.
+ */
+ cookie->pkt_len -= head_size;
+
+ /* if offload disabled, it is not zeroed below, do it now */
+ if (!vq->hw->has_tx_offload) {
+ ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
+ ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
+ ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
+ ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
+ ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
+ ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
+ }
+ } else if (use_indirect) {
+ /* setup tx ring slot to point to indirect
+ * descriptor list stored in reserved region.
+ *
+ * the first slot in indirect ring is already preset
+ * to point to the header in reserved region
+ */
+ start_dp[idx].addr = txvq->virtio_net_hdr_mem +
+ RTE_PTR_DIFF(&txr[idx].tx_indir_pq, txr);
+ start_dp[idx].len = (seg_num + 1) * sizeof(struct vring_desc_packed);
+ start_dp[idx].flags = VRING_DESC_F_INDIRECT;
+ hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
+
+ /* loop below will fill in rest of the indirect elements */
+ start_dp = txr[idx].tx_indir_pq;
+ idx = 1;
+ } else {
+ /* setup first tx ring slot to point to header
+ * stored in reserved region.
+ */
+ start_dp[idx].addr = txvq->virtio_net_hdr_mem +
+ RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
+ start_dp[idx].len = vq->hw->vtnet_hdr_size;
+ hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
+ idx = dxp->next;
+ }
+
+ virtqueue_xmit_offload(hdr, cookie, vq->hw->has_tx_offload);
+
+ do {
+ uint16_t flags;
+ if (idx >= vq->vq_nentries) {
+ idx = 0;
+ vq->vq_ring.avail_wrap_counter ^= 1;
+ }
+ start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
+ start_dp[idx].len = cookie->data_len;
+ if (likely(idx != head_id)) {
+ flags = cookie->next ? VRING_DESC_F_NEXT : 0;
+ flags |= VRING_DESC_F_AVAIL(vq->vq_ring.avail_wrap_counter) |
+ VRING_DESC_F_USED(!vq->vq_ring.avail_wrap_counter);
+ start_dp[idx].flags = flags;
+ }
+ if (use_indirect) {
+ if (++idx >= (seg_num + 1))
+ break;
+ } else {
+ dxp = &vq->vq_descx[idx];
+ if (idx == (vq->vq_nentries -1) && dxp->next == 0)
+ vq->vq_ring.avail_wrap_counter ^= 1;
+ idx = dxp->next;
+ }
+ } while ((cookie = cookie->next) != NULL);
+
+ if (use_indirect)
+ idx = vq->vq_ring.desc_packed[head_id].index;
+
+ vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
+
+ if (!in_order) {
+ if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
+ vq->vq_desc_tail_idx = idx;
+ }
+ vq->vq_avail_idx += needed;
+ if (idx==VQ_RING_DESC_CHAIN_END)
+ idx = vq->vq_avail_idx;
+ if (vq->vq_avail_idx >= vq->vq_nentries) {
+ vq->vq_avail_idx -= vq->vq_nentries;
+ idx = vq->vq_avail_idx;
+ vq->vq_ring.avail_wrap_counter ^= 1;
+ }
+ vq->vq_desc_head_idx = idx;
+
+ rte_smp_wmb();
+ head_dp->flags = head_flags;
+}
+
+
static inline void
virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
uint16_t needed, int use_indirect, int can_push,
@@ -1346,6 +1531,97 @@ virtio_recv_mergeable_pkts(void *rx_queue,
return nb_rx;
}
+uint16_t
+virtio_xmit_pkts_packed(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
+{
+ struct virtnet_tx *txvq = tx_queue;
+ struct virtqueue *vq = txvq->vq;
+ struct virtio_hw *hw = vq->hw;
+ uint16_t hdr_size = hw->vtnet_hdr_size;
+ uint16_t nb_tx = 0;
+ int error;
+
+ if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
+ return nb_tx;
+
+ if (unlikely(nb_pkts < 1))
+ return nb_pkts;
+
+ PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
+
+ virtio_rmb();
+ if (likely(nb_pkts > vq->vq_nentries - vq->vq_free_thresh))
+ virtio_xmit_cleanup_packed(vq);
+
+ for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
+ struct rte_mbuf *txm = tx_pkts[nb_tx];
+ int can_push = 0, use_indirect = 0, slots, need;
+
+ /* Do VLAN tag insertion */
+ if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
+ error = rte_vlan_insert(&txm);
+ if (unlikely(error)) {
+ rte_pktmbuf_free(txm);
+ continue;
+ }
+ }
+
+ /* optimize ring usage */
+ if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
+ vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
+ rte_mbuf_refcnt_read(txm) == 1 &&
+ RTE_MBUF_DIRECT(txm) &&
+ txm->nb_segs == 1 &&
+ rte_pktmbuf_headroom(txm) >= hdr_size &&
+ rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
+ __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
+ can_push = 1;
+ else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
+ txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
+ use_indirect = 1;
+
+ /* How many main ring entries are needed to this Tx?
+ * any_layout => number of segments
+ * indirect => 1
+ * default => number of segments + 1
+ */
+ slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
+ need = slots - vq->vq_free_cnt;
+
+ /* Positive value indicates it need free vring descriptors */
+ if (unlikely(need > 0)) {
+ virtio_rmb();
+ need = RTE_MIN(need, (int)nb_pkts);
+
+ virtio_xmit_cleanup_packed(vq);
+ need = slots - vq->vq_free_cnt;
+ if (unlikely(need > 0)) {
+ PMD_TX_LOG(ERR,
+ "No free tx descriptors to transmit");
+ break;
+ }
+ }
+
+ /* Enqueue Packet buffers */
+ virtqueue_enqueue_xmit_packed(txvq, txm, slots, use_indirect,
+ can_push, 0);
+
+ txvq->stats.bytes += txm->pkt_len;
+ virtio_update_packet_stats(&txvq->stats, txm);
+ }
+
+ txvq->stats.packets += nb_tx;
+
+ if (likely(nb_tx)) {
+ if (unlikely(virtqueue_kick_prepare_packed(vq))) {
+ virtqueue_notify(vq);
+ PMD_TX_LOG(DEBUG, "Notified backend after xmit");
+ }
+ }
+
+ return nb_tx;
+}
+
uint16_t
virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
{
diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
index 2af1bc259..9debbc3f9 100644
--- a/drivers/net/virtio/virtqueue.h
+++ b/drivers/net/virtio/virtqueue.h
@@ -242,8 +242,12 @@ struct virtio_net_hdr_mrg_rxbuf {
#define VIRTIO_MAX_TX_INDIRECT 8
struct virtio_tx_region {
struct virtio_net_hdr_mrg_rxbuf tx_hdr;
- struct vring_desc tx_indir[VIRTIO_MAX_TX_INDIRECT]
- __attribute__((__aligned__(16)));
+ union {
+ struct vring_desc tx_indir[VIRTIO_MAX_TX_INDIRECT]
+ __attribute__((__aligned__(16)));
+ struct vring_desc_packed tx_indir_pq[VIRTIO_MAX_TX_INDIRECT]
+ __attribute__((__aligned__(16)));
+ };
};
static inline void
@@ -319,6 +323,7 @@ virtio_get_queue_type(struct virtio_hw *hw, uint16_t vtpci_queue_idx)
#define VIRTQUEUE_NUSED(vq) ((uint16_t)((vq)->vq_ring.used->idx - (vq)->vq_used_cons_idx))
void vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx);
+void vq_ring_free_chain_packed(struct virtqueue *vq, uint16_t desc_idx);
void vq_ring_free_inorder(struct virtqueue *vq, uint16_t desc_idx,
uint16_t num);
@@ -352,6 +357,15 @@ virtqueue_kick_prepare(struct virtqueue *vq)
return !(vq->vq_ring.used->flags & VRING_USED_F_NO_NOTIFY);
}
+static inline int
+virtqueue_kick_prepare_packed(struct virtqueue *vq)
+{
+ uint16_t flags;
+
+ flags = vq->vq_ring.device_event->desc_event_flags & RING_EVENT_FLAGS_DESC;
+ return (flags != RING_EVENT_FLAGS_DISABLE);
+}
+
static inline void
virtqueue_notify(struct virtqueue *vq)
{
--
2.17.1
^ permalink raw reply [flat|nested] 10+ messages in thread
* [dpdk-dev] [PATCH v8 6/8] net/virtio: implement receive path for packed queues
2018-10-16 9:01 [dpdk-dev] [PATCH v8 0/8] implement packed virtqueues Jens Freimann
` (4 preceding siblings ...)
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 5/8] net/virtio: implement transmit path for packed queues Jens Freimann
@ 2018-10-16 9:01 ` Jens Freimann
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 7/8] net/virtio: add virtio send command packed queue support Jens Freimann
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 8/8] net/virtio: enable packed virtqueues by default Jens Freimann
7 siblings, 0 replies; 10+ messages in thread
From: Jens Freimann @ 2018-10-16 9:01 UTC (permalink / raw)
To: dev; +Cc: tiwei.bie, maxime.coquelin, Gavin.Hu
Implement the receive part.
Signed-off-by: Jens Freimann <jfreimann@redhat.com>
---
drivers/net/virtio/virtio_ethdev.c | 18 +-
drivers/net/virtio/virtio_ethdev.h | 2 +
drivers/net/virtio/virtio_rxtx.c | 269 ++++++++++++++++++++++++++---
drivers/net/virtio/virtqueue.c | 23 +++
4 files changed, 288 insertions(+), 24 deletions(-)
diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 14cf3657e..5a1c4b3e8 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -384,8 +384,10 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t vtpci_queue_idx)
vq->hw = hw;
vq->vq_queue_index = vtpci_queue_idx;
vq->vq_nentries = vq_size;
- if (vtpci_packed_queue(hw))
+ if (vtpci_packed_queue(hw)) {
vq->vq_ring.avail_wrap_counter = 1;
+ vq->vq_ring.used_wrap_counter = 1;
+ }
/*
* Reserve a memzone for vring elements
@@ -1326,7 +1328,13 @@ set_rxtx_funcs(struct rte_eth_dev *eth_dev)
{
struct virtio_hw *hw = eth_dev->data->dev_private;
- if (hw->use_simple_rx) {
+ if (vtpci_packed_queue(hw)) {
+ if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
+ eth_dev->rx_pkt_burst = &virtio_recv_mergeable_pkts;
+ } else {
+ eth_dev->rx_pkt_burst = &virtio_recv_pkts_packed;
+ }
+ } else if (hw->use_simple_rx) {
PMD_INIT_LOG(INFO, "virtio: using simple Rx path on port %u",
eth_dev->data->port_id);
eth_dev->rx_pkt_burst = virtio_recv_pkts_vec;
@@ -1490,7 +1498,8 @@ virtio_init_device(struct rte_eth_dev *eth_dev, uint64_t req_features)
/* Setting up rx_header size for the device */
if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF) ||
- vtpci_with_feature(hw, VIRTIO_F_VERSION_1))
+ vtpci_with_feature(hw, VIRTIO_F_VERSION_1) ||
+ vtpci_with_feature(hw, VIRTIO_F_RING_PACKED))
hw->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf);
else
hw->vtnet_hdr_size = sizeof(struct virtio_net_hdr);
@@ -1918,7 +1927,8 @@ virtio_dev_configure(struct rte_eth_dev *dev)
rte_spinlock_init(&hw->state_lock);
- hw->use_simple_rx = 1;
+ if (!vtpci_packed_queue(hw))
+ hw->use_simple_rx = 1;
if (vtpci_with_feature(hw, VIRTIO_F_IN_ORDER)) {
hw->use_inorder_tx = 1;
diff --git a/drivers/net/virtio/virtio_ethdev.h b/drivers/net/virtio/virtio_ethdev.h
index 05d355180..6c9247639 100644
--- a/drivers/net/virtio/virtio_ethdev.h
+++ b/drivers/net/virtio/virtio_ethdev.h
@@ -73,6 +73,8 @@ int virtio_dev_tx_queue_setup_finish(struct rte_eth_dev *dev,
uint16_t virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
uint16_t nb_pkts);
+uint16_t virtio_recv_pkts_packed(void *rx_queue, struct rte_mbuf **rx_pkts,
+ uint16_t nb_pkts);
uint16_t virtio_recv_mergeable_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
uint16_t nb_pkts);
diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c
index 0c17102c3..cfa896db0 100644
--- a/drivers/net/virtio/virtio_rxtx.c
+++ b/drivers/net/virtio/virtio_rxtx.c
@@ -31,6 +31,7 @@
#include "virtqueue.h"
#include "virtio_rxtx.h"
#include "virtio_rxtx_simple.h"
+#include "virtio_ring.h"
#ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
#define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(stdout, m, len)
@@ -123,6 +124,47 @@ vq_ring_free_chain_packed(struct virtqueue *vq, uint16_t desc_idx)
dxp->next = VQ_RING_DESC_CHAIN_END;
}
+static uint16_t
+virtqueue_dequeue_burst_rx_packed(struct virtqueue *vq,
+ struct rte_mbuf **rx_pkts,
+ uint32_t *len,
+ uint16_t num)
+{
+ struct rte_mbuf *cookie;
+ uint16_t used_idx;
+ uint16_t id;
+ struct vring_desc_packed *desc;
+ uint16_t i;
+
+ for (i = 0; i < num; i++) {
+ used_idx = vq->vq_used_cons_idx;
+ desc = (struct vring_desc_packed *) vq->vq_ring.desc_packed;
+ if (!desc_is_used(&desc[used_idx], &vq->vq_ring))
+ return i;
+ len[i] = desc[used_idx].len;
+ id = desc[used_idx].index;
+ cookie = (struct rte_mbuf *)vq->vq_descx[id].cookie;
+
+ if (unlikely(cookie == NULL)) {
+ PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
+ vq->vq_used_cons_idx);
+ break;
+ }
+ rte_prefetch0(cookie);
+ rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
+ rx_pkts[i] = cookie;
+ vq_ring_free_chain_packed(vq, id);
+
+
+ if (++vq->vq_used_cons_idx >= vq->vq_nentries) {
+ vq->vq_used_cons_idx = 0;
+ vq->vq_ring.used_wrap_counter ^= 1;
+ }
+ }
+
+ return i;
+}
+
static uint16_t
virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
uint32_t *len, uint16_t num)
@@ -368,6 +410,55 @@ virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie)
return 0;
}
+static inline int
+virtqueue_enqueue_recv_refill_packed(struct virtqueue *vq, struct rte_mbuf *cookie)
+{
+ struct vq_desc_extra *dxp;
+ struct virtio_hw *hw = vq->hw;
+ struct vring_desc_packed *start_dp;
+ uint16_t needed = 1;
+ uint16_t head_idx, idx;
+ uint16_t flags;
+
+ if (unlikely(vq->vq_free_cnt == 0))
+ return -ENOSPC;
+ if (unlikely(vq->vq_free_cnt < needed))
+ return -EMSGSIZE;
+
+ head_idx = vq->vq_desc_head_idx;
+ if (unlikely(head_idx >= vq->vq_nentries))
+ return -EFAULT;
+
+ idx = head_idx;
+ dxp = &vq->vq_descx[idx];
+ dxp->cookie = (void *)cookie;
+ dxp->ndescs = needed;
+
+ start_dp = vq->vq_ring.desc_packed;
+ start_dp[idx].addr =
+ VIRTIO_MBUF_ADDR(cookie, vq) +
+ RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
+ start_dp[idx].len =
+ cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size;
+ flags = VRING_DESC_F_WRITE;
+ flags |= VRING_DESC_F_AVAIL(vq->vq_ring.avail_wrap_counter) |
+ VRING_DESC_F_USED(!vq->vq_ring.avail_wrap_counter);
+ rte_smp_wmb();
+ start_dp[idx].flags = flags;
+ idx = dxp->next;
+ vq->vq_desc_head_idx = idx;
+ if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
+ vq->vq_desc_tail_idx = idx;
+ vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
+
+ vq->vq_avail_idx += needed;
+ if (vq->vq_avail_idx >= vq->vq_nentries) {
+ vq->vq_avail_idx = 0;
+ vq->vq_ring.avail_wrap_counter ^= 1;
+ }
+
+ return 0;
+}
/* When doing TSO, the IP length is not included in the pseudo header
* checksum of the packet given to the PMD, but for virtio it is
* expected.
@@ -841,7 +932,10 @@ virtio_dev_rx_queue_setup_finish(struct rte_eth_dev *dev, uint16_t queue_idx)
break;
/* Enqueue allocated buffers */
- error = virtqueue_enqueue_recv_refill(vq, m);
+ if (vtpci_packed_queue(vq->hw))
+ error = virtqueue_enqueue_recv_refill_packed(vq, m);
+ else
+ error = virtqueue_enqueue_recv_refill(vq, m);
if (error) {
rte_pktmbuf_free(m);
break;
@@ -849,7 +943,8 @@ virtio_dev_rx_queue_setup_finish(struct rte_eth_dev *dev, uint16_t queue_idx)
nbufs++;
}
- vq_update_avail_idx(vq);
+ if (!vtpci_packed_queue(vq->hw))
+ vq_update_avail_idx(vq);
}
PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
@@ -1173,6 +1268,109 @@ virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
return nb_rx;
}
+uint16_t
+virtio_recv_pkts_packed(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
+{
+ struct virtnet_rx *rxvq = rx_queue;
+ struct virtqueue *vq = rxvq->vq;
+ struct virtio_hw *hw = vq->hw;
+ struct rte_mbuf *rxm, *new_mbuf;
+ uint16_t nb_used, num, nb_rx;
+ uint32_t len[VIRTIO_MBUF_BURST_SZ];
+ struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
+ int error;
+ uint32_t i, nb_enqueued;
+ uint32_t hdr_size;
+ struct virtio_net_hdr *hdr;
+
+ nb_rx = 0;
+ if (unlikely(hw->started == 0))
+ return nb_rx;
+
+ nb_used = VIRTIO_MBUF_BURST_SZ;
+
+ virtio_rmb();
+
+ num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
+ if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
+ num = VIRTIO_MBUF_BURST_SZ;
+ if (likely(num > DESC_PER_CACHELINE))
+ num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
+
+ num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts, len, num);
+ PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
+
+ nb_enqueued = 0;
+ hdr_size = hw->vtnet_hdr_size;
+
+ for (i = 0; i < num ; i++) {
+ rxm = rcv_pkts[i];
+
+ PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
+
+ if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
+ PMD_RX_LOG(ERR, "Packet drop");
+ nb_enqueued++;
+ virtio_discard_rxbuf(vq, rxm);
+ rxvq->stats.errors++;
+ continue;
+ }
+
+ rxm->port = rxvq->port_id;
+ rxm->data_off = RTE_PKTMBUF_HEADROOM;
+ rxm->ol_flags = 0;
+ rxm->vlan_tci = 0;
+
+ rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
+ rxm->data_len = (uint16_t)(len[i] - hdr_size);
+
+ hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
+ RTE_PKTMBUF_HEADROOM - hdr_size);
+
+ if (hw->vlan_strip)
+ rte_vlan_strip(rxm);
+
+ if (hw->has_rx_offload && virtio_rx_offload(rxm, hdr) < 0) {
+ virtio_discard_rxbuf(vq, rxm);
+ rxvq->stats.errors++;
+ continue;
+ }
+
+ virtio_rx_stats_updated(rxvq, rxm);
+
+ rx_pkts[nb_rx++] = rxm;
+ }
+
+ rxvq->stats.packets += nb_rx;
+
+ /* Allocate new mbuf for the used descriptor */
+ while (likely(!virtqueue_full(vq))) {
+ new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
+ if (unlikely(new_mbuf == NULL)) {
+ struct rte_eth_dev *dev
+ = &rte_eth_devices[rxvq->port_id];
+ dev->data->rx_mbuf_alloc_failed++;
+ break;
+ }
+ error = virtqueue_enqueue_recv_refill_packed(vq, new_mbuf);
+ if (unlikely(error)) {
+ rte_pktmbuf_free(new_mbuf);
+ break;
+ }
+ nb_enqueued++;
+ }
+
+ if (likely(nb_enqueued)) {
+ if (unlikely(virtqueue_kick_prepare_packed(vq))) {
+ virtqueue_notify(vq);
+ PMD_RX_LOG(DEBUG, "Notified");
+ }
+ }
+
+ return nb_rx;
+}
+
+
uint16_t
virtio_recv_mergeable_pkts_inorder(void *rx_queue,
struct rte_mbuf **rx_pkts,
@@ -1379,12 +1577,16 @@ virtio_recv_mergeable_pkts(void *rx_queue,
uint16_t extra_idx;
uint32_t seg_res;
uint32_t hdr_size;
+ uint32_t rx_num = 0;
nb_rx = 0;
if (unlikely(hw->started == 0))
return nb_rx;
- nb_used = VIRTQUEUE_NUSED(vq);
+ if (vtpci_packed_queue(vq->hw))
+ nb_used = VIRTIO_MBUF_BURST_SZ;
+ else
+ nb_used = VIRTQUEUE_NUSED(vq);
virtio_rmb();
@@ -1397,13 +1599,20 @@ virtio_recv_mergeable_pkts(void *rx_queue,
seg_res = 0;
hdr_size = hw->vtnet_hdr_size;
+
while (i < nb_used) {
struct virtio_net_hdr_mrg_rxbuf *header;
if (nb_rx == nb_pkts)
break;
- num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1);
+ if (vtpci_packed_queue(vq->hw))
+ num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts,
+ len, 1);
+ else
+ num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1);
+ if (num == 0)
+ return nb_rx;
if (num != 1)
continue;
@@ -1455,20 +1664,33 @@ virtio_recv_mergeable_pkts(void *rx_queue,
*/
uint16_t rcv_cnt =
RTE_MIN(seg_res, RTE_DIM(rcv_pkts));
- if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
- uint32_t rx_num =
- virtqueue_dequeue_burst_rx(vq,
- rcv_pkts, len, rcv_cnt);
- i += rx_num;
- rcv_cnt = rx_num;
+ if (vtpci_packed_queue(vq->hw)) {
+ if (likely(vq->vq_free_cnt >= rcv_cnt)) {
+ rx_num = virtqueue_dequeue_burst_rx_packed(vq,
+ rcv_pkts, len, rcv_cnt);
+ } else {
+ PMD_RX_LOG(ERR,
+ "No enough segments for packet.");
+ nb_enqueued++;
+ virtio_discard_rxbuf(vq, rxm);
+ rxvq->stats.errors++;
+ break;
+ }
} else {
- PMD_RX_LOG(ERR,
- "No enough segments for packet.");
- nb_enqueued++;
- virtio_discard_rxbuf(vq, rxm);
- rxvq->stats.errors++;
- break;
+ if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
+ rx_num = virtqueue_dequeue_burst_rx(vq,
+ rcv_pkts, len, rcv_cnt);
+ } else {
+ PMD_RX_LOG(ERR,
+ "No enough segments for packet.");
+ nb_enqueued++;
+ virtio_discard_rxbuf(vq, rxm);
+ rxvq->stats.errors++;
+ break;
+ }
}
+ i += rx_num;
+ rcv_cnt = rx_num;
extra_idx = 0;
@@ -1511,7 +1733,10 @@ virtio_recv_mergeable_pkts(void *rx_queue,
dev->data->rx_mbuf_alloc_failed++;
break;
}
- error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
+ if (vtpci_packed_queue(vq->hw))
+ error = virtqueue_enqueue_recv_refill_packed(vq, new_mbuf);
+ else
+ error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
if (unlikely(error)) {
rte_pktmbuf_free(new_mbuf);
break;
@@ -1520,9 +1745,13 @@ virtio_recv_mergeable_pkts(void *rx_queue,
}
if (likely(nb_enqueued)) {
- vq_update_avail_idx(vq);
-
- if (unlikely(virtqueue_kick_prepare(vq))) {
+ if (likely(!vtpci_packed_queue(vq->hw))) {
+ vq_update_avail_idx(vq);
+ if (unlikely(virtqueue_kick_prepare(vq))) {
+ virtqueue_notify(vq);
+ PMD_RX_LOG(DEBUG, "Notified");
+ }
+ } else if (virtqueue_kick_prepare_packed(vq)) {
virtqueue_notify(vq);
PMD_RX_LOG(DEBUG, "Notified");
}
diff --git a/drivers/net/virtio/virtqueue.c b/drivers/net/virtio/virtqueue.c
index 56a77cc71..6b541d789 100644
--- a/drivers/net/virtio/virtqueue.c
+++ b/drivers/net/virtio/virtqueue.c
@@ -58,12 +58,35 @@ virtqueue_detach_unused(struct virtqueue *vq)
void
virtqueue_rxvq_flush(struct virtqueue *vq)
{
+ struct vring_desc_packed *descs = vq->vq_ring.desc_packed;
struct virtnet_rx *rxq = &vq->rxq;
struct virtio_hw *hw = vq->hw;
struct vring_used_elem *uep;
struct vq_desc_extra *dxp;
uint16_t used_idx, desc_idx;
uint16_t nb_used, i;
+ uint16_t size = vq->vq_nentries;
+
+ if (vtpci_packed_queue(vq->hw)) {
+ return;
+ i = vq->vq_used_cons_idx;
+ if (i > size) {
+ PMD_INIT_LOG(ERR, "vq_used_cons_idx out of range, %d", vq->vq_used_cons_idx);
+ return;
+ }
+ while (desc_is_used(&descs[i], &vq->vq_ring) &&
+ i < size) {
+ dxp = &vq->vq_descx[descs[i].index];
+ if (dxp->cookie != NULL) {
+ rte_pktmbuf_free(dxp->cookie);
+ dxp->cookie = NULL;
+ }
+ vq_ring_free_chain_packed(vq, i);
+ i = dxp->next;
+ vq->vq_used_cons_idx++;
+ }
+ return;
+ }
nb_used = VIRTQUEUE_NUSED(vq);
--
2.17.1
^ permalink raw reply [flat|nested] 10+ messages in thread
* [dpdk-dev] [PATCH v8 7/8] net/virtio: add virtio send command packed queue support
2018-10-16 9:01 [dpdk-dev] [PATCH v8 0/8] implement packed virtqueues Jens Freimann
` (5 preceding siblings ...)
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 6/8] net/virtio: implement receive " Jens Freimann
@ 2018-10-16 9:01 ` Jens Freimann
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 8/8] net/virtio: enable packed virtqueues by default Jens Freimann
7 siblings, 0 replies; 10+ messages in thread
From: Jens Freimann @ 2018-10-16 9:01 UTC (permalink / raw)
To: dev; +Cc: tiwei.bie, maxime.coquelin, Gavin.Hu
Use packed virtqueue format when reading and writing descriptors
to/from the ring.
Signed-off-by: Jens Freimann <jfreimann@redhat.com>
---
drivers/net/virtio/virtio_ethdev.c | 90 ++++++++++++++++++++++++++++++
1 file changed, 90 insertions(+)
diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 5a1c4b3e8..751316c2c 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -141,6 +141,90 @@ static const struct rte_virtio_xstats_name_off rte_virtio_txq_stat_strings[] = {
struct virtio_hw_internal virtio_hw_internal[RTE_MAX_ETHPORTS];
+static struct virtio_pmd_ctrl *
+virtio_pq_send_command(struct virtnet_ctl *cvq, struct virtio_pmd_ctrl *ctrl,
+ int *dlen, int pkt_num)
+{
+ struct virtqueue *vq = cvq->vq;
+ int head;
+ struct vring_desc_packed *desc = vq->vq_ring.desc_packed;
+ struct virtio_pmd_ctrl *result;
+ int wrap_counter;
+ int sum = 0;
+ int k;
+
+ /*
+ * Format is enforced in qemu code:
+ * One TX packet for header;
+ * At least one TX packet per argument;
+ * One RX packet for ACK.
+ */
+ head = vq->vq_avail_idx;
+ wrap_counter = vq->vq_ring.avail_wrap_counter;
+ desc[head].flags = VRING_DESC_F_NEXT;
+ desc[head].addr = cvq->virtio_net_hdr_mem;
+ desc[head].len = sizeof(struct virtio_net_ctrl_hdr);
+ vq->vq_free_cnt--;
+ if (++vq->vq_avail_idx >= vq->vq_nentries) {
+ vq->vq_avail_idx -= vq->vq_nentries;
+ vq->vq_ring.avail_wrap_counter ^= 1;
+ }
+
+ for (k = 0; k < pkt_num; k++) {
+ desc[vq->vq_avail_idx].addr = cvq->virtio_net_hdr_mem
+ + sizeof(struct virtio_net_ctrl_hdr)
+ + sizeof(ctrl->status) + sizeof(uint8_t) * sum;
+ desc[vq->vq_avail_idx].len = dlen[k];
+ desc[vq->vq_avail_idx].flags = VRING_DESC_F_NEXT;
+ sum += dlen[k];
+ vq->vq_free_cnt--;
+ _set_desc_avail(&desc[vq->vq_avail_idx],
+ vq->vq_ring.avail_wrap_counter);
+ rte_smp_wmb();
+ vq->vq_free_cnt--;
+ if (++vq->vq_avail_idx >= vq->vq_nentries) {
+ vq->vq_avail_idx -= vq->vq_nentries;
+ vq->vq_ring.avail_wrap_counter ^= 1;
+ }
+ }
+
+
+ desc[vq->vq_avail_idx].addr = cvq->virtio_net_hdr_mem
+ + sizeof(struct virtio_net_ctrl_hdr);
+ desc[vq->vq_avail_idx].len = sizeof(ctrl->status);
+ desc[vq->vq_avail_idx].flags = VRING_DESC_F_WRITE;
+ _set_desc_avail(&desc[vq->vq_avail_idx],
+ vq->vq_ring.avail_wrap_counter);
+ _set_desc_avail(&desc[head], wrap_counter);
+ rte_smp_wmb();
+
+ vq->vq_free_cnt--;
+ if (++vq->vq_avail_idx >= vq->vq_nentries) {
+ vq->vq_avail_idx -= vq->vq_nentries;
+ vq->vq_ring.avail_wrap_counter ^= 1;
+ }
+
+ virtqueue_notify(vq);
+
+ /* wait for used descriptors in virtqueue */
+ do {
+ rte_rmb();
+ usleep(100);
+ } while (!desc_is_used(&desc[head], &vq->vq_ring));
+
+ /* now get used descriptors */
+ while(desc_is_used(&desc[vq->vq_used_cons_idx], &vq->vq_ring)) {
+ vq->vq_free_cnt++;
+ if (++vq->vq_used_cons_idx >= vq->vq_nentries) {
+ vq->vq_used_cons_idx -= vq->vq_nentries;
+ vq->vq_ring.used_wrap_counter ^= 1;
+ }
+ }
+
+ result = cvq->virtio_net_hdr_mz->addr;
+ return result;
+}
+
static int
virtio_send_command(struct virtnet_ctl *cvq, struct virtio_pmd_ctrl *ctrl,
int *dlen, int pkt_num)
@@ -174,6 +258,11 @@ virtio_send_command(struct virtnet_ctl *cvq, struct virtio_pmd_ctrl *ctrl,
memcpy(cvq->virtio_net_hdr_mz->addr, ctrl,
sizeof(struct virtio_pmd_ctrl));
+ if (vtpci_packed_queue(vq->hw)) {
+ result = virtio_pq_send_command(cvq, ctrl, dlen, pkt_num);
+ goto out_unlock;
+ }
+
/*
* Format is enforced in qemu code:
* One TX packet for header;
@@ -245,6 +334,7 @@ virtio_send_command(struct virtnet_ctl *cvq, struct virtio_pmd_ctrl *ctrl,
result = cvq->virtio_net_hdr_mz->addr;
+out_unlock:
rte_spinlock_unlock(&cvq->lock);
return result->status;
}
--
2.17.1
^ permalink raw reply [flat|nested] 10+ messages in thread
* [dpdk-dev] [PATCH v8 8/8] net/virtio: enable packed virtqueues by default
2018-10-16 9:01 [dpdk-dev] [PATCH v8 0/8] implement packed virtqueues Jens Freimann
` (6 preceding siblings ...)
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 7/8] net/virtio: add virtio send command packed queue support Jens Freimann
@ 2018-10-16 9:01 ` Jens Freimann
7 siblings, 0 replies; 10+ messages in thread
From: Jens Freimann @ 2018-10-16 9:01 UTC (permalink / raw)
To: dev; +Cc: tiwei.bie, maxime.coquelin, Gavin.Hu
Signed-off-by: Jens Freimann <jfreimann@redhat.com>
---
drivers/net/virtio/virtio_ethdev.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/net/virtio/virtio_ethdev.h b/drivers/net/virtio/virtio_ethdev.h
index 6c9247639..d9b4feee2 100644
--- a/drivers/net/virtio/virtio_ethdev.h
+++ b/drivers/net/virtio/virtio_ethdev.h
@@ -34,6 +34,7 @@
1u << VIRTIO_RING_F_INDIRECT_DESC | \
1ULL << VIRTIO_F_VERSION_1 | \
1ULL << VIRTIO_F_IN_ORDER | \
+ 1ULL << VIRTIO_F_RING_PACKED | \
1ULL << VIRTIO_F_IOMMU_PLATFORM)
#define VIRTIO_PMD_SUPPORTED_GUEST_FEATURES \
--
2.17.1
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [dpdk-dev] [PATCH v8 5/8] net/virtio: implement transmit path for packed queues
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 5/8] net/virtio: implement transmit path for packed queues Jens Freimann
@ 2018-10-18 4:43 ` Tiwei Bie
0 siblings, 0 replies; 10+ messages in thread
From: Tiwei Bie @ 2018-10-18 4:43 UTC (permalink / raw)
To: Jens Freimann; +Cc: dev, maxime.coquelin, Gavin.Hu, zhihong.wang
On Tue, Oct 16, 2018 at 11:01:31AM +0200, Jens Freimann wrote:
[...]
> +void
> +vq_ring_free_chain_packed(struct virtqueue *vq, uint16_t desc_idx)
> +{
> + struct vring_desc_packed *dp;
> + struct vq_desc_extra *dxp = NULL, *dxp_tail = NULL;
> + uint16_t desc_idx_last = desc_idx;
> +
> + dp = &vq->vq_ring.desc_packed[desc_idx];
> + dxp = &vq->vq_descx[desc_idx];
In the out-of-order case, we can't assume the desc and desc_extra
have the same index.
> + vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs);
> + if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) {
> + while (dp->flags & VRING_DESC_F_NEXT) {
https://github.com/oasis-tcs/virtio-spec/blob/89dd55f5e606/packed-ring.tex#L222-L226
The device only writes out a single used descriptor for the whole
list. It then skips forward according to the number of
descriptors in the list. The driver needs to keep track of the size
of the list corresponding to each buffer ID, to be able to skip
to where the next used descriptor is written by the device.
IOW, we can't use the VRING_DESC_F_NEXT here.
> + desc_idx_last = dxp->next;
> + dp = &vq->vq_ring.desc_packed[dxp->next];
> + dxp = &vq->vq_descx[dxp->next];
> + }
> + }
^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2018-10-18 4:44 UTC | newest]
Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-10-16 9:01 [dpdk-dev] [PATCH v8 0/8] implement packed virtqueues Jens Freimann
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 1/8] net/virtio: vring init for packed queues Jens Freimann
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 2/8] net/virtio: add packed virtqueue defines Jens Freimann
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 3/8] net/virtio: add packed virtqueue helpers Jens Freimann
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 4/8] net/virtio: dump packed virtqueue data Jens Freimann
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 5/8] net/virtio: implement transmit path for packed queues Jens Freimann
2018-10-18 4:43 ` Tiwei Bie
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 6/8] net/virtio: implement receive " Jens Freimann
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 7/8] net/virtio: add virtio send command packed queue support Jens Freimann
2018-10-16 9:01 ` [dpdk-dev] [PATCH v8 8/8] net/virtio: enable packed virtqueues by default Jens Freimann
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