diff mbox series

[2/5] vhost: implement rte_power_monitor API

Message ID 20210918132206.166694-3-miao.li@intel.com (mailing list archive)
State Superseded, archived
Delegated to: Maxime Coquelin
Headers show
Series Implement rte_power_monitor API in virtio/vhost PMD | expand

Checks

Context Check Description
ci/checkpatch warning coding style issues

Commit Message

Li, Miao Sept. 18, 2021, 1:22 p.m. UTC
This patch defines rte_vhost_power_monitor_cond which is used to pass
some information to vhost driver. The information is including the address
to monitor, the expected value, the mask to extract value read from 'addr',
the value size of monitor address, the match flag used to distinguish the
value used to match something or not match someting. Vhost driver can use
these information to fill rte_power_monitor_cond.

Signed-off-by: Miao Li <miao.li@intel.com>
---
 lib/vhost/rte_vhost.h | 41 +++++++++++++++++++++++++++++++++++++++++
 lib/vhost/version.map |  3 +++
 lib/vhost/vhost.c     | 38 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 82 insertions(+)
diff mbox series

Patch

diff --git a/lib/vhost/rte_vhost.h b/lib/vhost/rte_vhost.h
index 8d875e9322..4e1f2de12f 100644
--- a/lib/vhost/rte_vhost.h
+++ b/lib/vhost/rte_vhost.h
@@ -292,6 +292,30 @@  struct vhost_device_ops {
 	void *reserved[1]; /**< Reserved for future extension */
 };
 
+/**
+ * Power monitor condition.
+ */
+struct rte_vhost_power_monitor_cond {
+	volatile void *addr;  /**< Address to monitor for changes */
+	/**< If the `mask` is non-zero, location pointed
+	 *   to by `addr` will be read and compared
+	 *   against this value.
+	 */
+	uint64_t val;
+	uint64_t mask; /**< 64-bit mask to extract value read from `addr` */
+	/**< Data size (in bytes) that will be read from the
+	 *   monitored memory location (`addr`). Can be 1, 2,
+	 *   4, or 8. Supplying any other value will result in
+	 *   an error.
+	 */
+	uint8_t size;
+	/**< If 1, checking if `val` matches something.
+	 *  If 0, checking if `val` *doesn't* match a
+	 *  particular value.
+	 */
+	uint8_t match;
+};
+
 /**
  * Convert guest physical address to host virtual address
  *
@@ -914,6 +938,23 @@  int rte_vhost_vring_call(int vid, uint16_t vring_idx);
  */
 uint32_t rte_vhost_rx_queue_count(int vid, uint16_t qid);
 
+/**
+ * Get power monitor address of the vhost device
+ *
+ * @param vid
+ *  vhost device ID
+ * @param queue_id
+ *  vhost queue ID
+ * @param pmc
+ *  power monitor condition
+ * @return
+ *  0 on success, -1 on failure
+ */
+__rte_experimental
+int
+rte_vhost_get_monitor_addr(int vid, uint16_t queue_id,
+		struct rte_vhost_power_monitor_cond *pmc);
+
 /**
  * Get log base and log size of the vhost device
  *
diff --git a/lib/vhost/version.map b/lib/vhost/version.map
index c92a9d4962..0a9667ef1e 100644
--- a/lib/vhost/version.map
+++ b/lib/vhost/version.map
@@ -85,4 +85,7 @@  EXPERIMENTAL {
 	rte_vhost_async_channel_register_thread_unsafe;
 	rte_vhost_async_channel_unregister_thread_unsafe;
 	rte_vhost_clear_queue_thread_unsafe;
+
+	# added in 21.11
+	rte_vhost_get_monitor_addr;
 };
diff --git a/lib/vhost/vhost.c b/lib/vhost/vhost.c
index 355ff37651..92a9f8bb90 100644
--- a/lib/vhost/vhost.c
+++ b/lib/vhost/vhost.c
@@ -1886,5 +1886,43 @@  int rte_vhost_async_get_inflight(int vid, uint16_t queue_id)
 	return ret;
 }
 
+int
+rte_vhost_get_monitor_addr(int vid, uint16_t queue_id,
+		struct rte_vhost_power_monitor_cond *pmc)
+{
+	struct virtio_net *dev = get_device(vid);
+
+	if (dev == NULL)
+		return -1;
+	if (queue_id >= VHOST_MAX_VRING)
+		return -1;
+
+	struct vhost_virtqueue *vq = dev->virtqueue[queue_id];
+
+	if (vq == NULL)
+		return -1;
+
+	if (vq_is_packed(dev)) {
+		struct vring_packed_desc *desc;
+		desc = vq->desc_packed;
+		pmc->addr = &desc[vq->last_avail_idx].flags;
+		if (vq->avail_wrap_counter)
+			pmc->val = VRING_DESC_F_AVAIL;
+		else
+			pmc->val = VRING_DESC_F_USED;
+		pmc->mask = VRING_DESC_F_AVAIL | VRING_DESC_F_USED;
+		pmc->size = sizeof(desc[vq->last_avail_idx].flags);
+		pmc->match = 1;
+	} else {
+		pmc->addr = &vq->avail->idx;
+		pmc->val = vq->last_avail_idx & (vq->size - 1);
+		pmc->mask = vq->size - 1;
+		pmc->size = sizeof(vq->avail->idx);
+		pmc->match = 0;
+	}
+
+	return 0;
+}
+
 RTE_LOG_REGISTER_SUFFIX(vhost_config_log_level, config, INFO);
 RTE_LOG_REGISTER_SUFFIX(vhost_data_log_level, data, WARNING);