diff mbox series

[v3] net/virtio: packed ring notification data feature support

Message ID 20191223051543.41579-1-Cheng1.jiang@intel.com (mailing list archive)
State Superseded, archived
Delegated to: Maxime Coquelin
Headers
Series [v3] net/virtio: packed ring notification data feature support |

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/iol-intel-Performance success Performance Testing PASS
ci/iol-testing success Testing PASS
ci/iol-mellanox-Performance success Performance Testing PASS
ci/travis-robot success Travis build: passed
ci/Intel-compilation success Compilation OK

Commit Message

Jiang, Cheng1 Dec. 23, 2019, 5:15 a.m. UTC 
  This patch supports the feature that the driver passes extra data
(besides identifying the virtqueue) in its device notifications,
expanding the notifications to include the avail index and avail
wrap counter.

Signed-off-by: Cheng Jiang <Cheng1.jiang@intel.com>
---

v3:
* Modified the commit log to make it more detailed.
* Modified the shift mode of notify_data to make it more intuitive.

v2:
* Removed rte_unused attribute in *hw.
* Added some comments on notify_data.

 drivers/net/virtio/virtio_ethdev.h |  3 ++-
 drivers/net/virtio/virtio_pci.c    | 28 ++++++++++++++++++++++++++--
 drivers/net/virtio/virtio_pci.h    |  6 ++++++
 3 files changed, 34 insertions(+), 3 deletions(-)

Comments

Gavin Hu Dec. 23, 2019, 6:49 a.m. UTC | #1 
Reviewed-by: Gavin Hu <gavin.hu@arm.com>
diff mbox series

Patch

diff --git a/drivers/net/virtio/virtio_ethdev.h b/drivers/net/virtio/virtio_ethdev.h
index a10111758..cd8947656 100644
--- a/drivers/net/virtio/virtio_ethdev.h
+++ b/drivers/net/virtio/virtio_ethdev.h
@@ -36,7 +36,8 @@ 
 	 1ULL << VIRTIO_F_IN_ORDER        |	\
 	 1ULL << VIRTIO_F_RING_PACKED	  |	\
 	 1ULL << VIRTIO_F_IOMMU_PLATFORM  |	\
-	 1ULL << VIRTIO_F_ORDER_PLATFORM)
+	 1ULL << VIRTIO_F_ORDER_PLATFORM  |	\
+	 1ULL << VIRTIO_F_NOTIFICATION_DATA)
 
 #define VIRTIO_PMD_SUPPORTED_GUEST_FEATURES	\
 	(VIRTIO_PMD_DEFAULT_GUEST_FEATURES |	\
diff --git a/drivers/net/virtio/virtio_pci.c b/drivers/net/virtio/virtio_pci.c
index 4468e89cb..dedd6bdda 100644
--- a/drivers/net/virtio/virtio_pci.c
+++ b/drivers/net/virtio/virtio_pci.c
@@ -416,9 +416,33 @@  modern_del_queue(struct virtio_hw *hw, struct virtqueue *vq)
 }
 
 static void
-modern_notify_queue(struct virtio_hw *hw __rte_unused, struct virtqueue *vq)
+modern_notify_queue(struct virtio_hw *hw, struct virtqueue *vq)
 {
-	rte_write16(vq->vq_queue_index, vq->notify_addr);
+	uint32_t notify_data;
+
+	if (!vtpci_with_feature(hw, VIRTIO_F_NOTIFICATION_DATA)) {
+		rte_write16(vq->vq_queue_index, vq->notify_addr);
+		return;
+	}
+
+	if (vtpci_with_feature(hw, VIRTIO_F_RING_PACKED)) {
+		/*
+		 * Bit[0:15]: vq queue index
+		 * Bit[16:30]: avail index
+		 * Bit[31]: avail wrap counter
+		 */
+		notify_data = ((uint32_t)vq->vq_packed.used_wrap_counter << 31) |
+				((uint32_t)vq->vq_avail_idx << 16) |
+				vq->vq_queue_index;
+	} else {
+		/*
+		 * Bit[0:15]: vq queue index
+		 * Bit[16:31]: avail index
+		 */
+		notify_data = ((uint32_t)vq->vq_avail_idx << 16) |
+				vq->vq_queue_index;
+	}
+	rte_write32(notify_data, vq->notify_addr);
 }
 
 const struct virtio_pci_ops modern_ops = {
diff --git a/drivers/net/virtio/virtio_pci.h b/drivers/net/virtio/virtio_pci.h
index a38cb45ad..7433d2f08 100644
--- a/drivers/net/virtio/virtio_pci.h
+++ b/drivers/net/virtio/virtio_pci.h
@@ -135,6 +135,12 @@  struct virtnet_ctl;
  */
 #define VIRTIO_F_ORDER_PLATFORM 36
 
+/*
+ * This feature indicates that the driver passes extra data (besides
+ * identifying the virtqueue) in its device notifications.
+ */
+#define VIRTIO_F_NOTIFICATION_DATA 38
+
 /* The Guest publishes the used index for which it expects an interrupt
  * at the end of the avail ring. Host should ignore the avail->flags field. */
 /* The Host publishes the avail index for which it expects a kick