[dpdk-dev] [PATCH v8 3/5] net/vhost: support power monitor

[Miao Li <miao.li@intel.com>]

According to current semantics of power monitor, this commit adds a
callback function to decide whether aborts the sleep by checking
current value against the expected value and vhost_get_monitor_addr
to provide address to monitor. When no packet come in, the value of
address will not be changed and the running core will sleep. Once
packets arrive, the value of address will be changed and the running
core will wakeup.

Signed-off-by: Miao Li <miao.li@intel.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
Acked-by: David Hunt <david.hunt@intel.com>
---
 doc/guides/rel_notes/release_21_11.rst |  4 +++
 drivers/net/vhost/rte_eth_vhost.c      | 40 ++++++++++++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/doc/guides/rel_notes/release_21_11.rst b/doc/guides/rel_notes/release_21_11.rst
index 4cbf82e38e..d60854b7ca 100644
--- a/doc/guides/rel_notes/release_21_11.rst
+++ b/doc/guides/rel_notes/release_21_11.rst
@@ -201,6 +201,10 @@ New Features
 
   Added an API to support power monitor in vhost library.
 
+* **Updated vhost PMD.**
+
+  Add power monitor support in vhost PMD.
+
 * **Updated virtio PMD.**
 
   Add power monitor support in virtio PMD.
diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c
index beb4b8de2d..55bc92664f 100644
--- a/drivers/net/vhost/rte_eth_vhost.c
+++ b/drivers/net/vhost/rte_eth_vhost.c
@@ -1380,6 +1380,45 @@ eth_rx_queue_count(void *rx_queue)
 	return rte_vhost_rx_queue_count(vq->vid, vq->virtqueue_id);
 }
 
+#define CLB_VAL_IDX 0
+#define CLB_MSK_IDX 1
+#define CLB_MATCH_IDX 2
+static int
+vhost_monitor_callback(const uint64_t value,
+		const uint64_t opaque[RTE_POWER_MONITOR_OPAQUE_SZ])
+{
+	const uint64_t m = opaque[CLB_MSK_IDX];
+	const uint64_t v = opaque[CLB_VAL_IDX];
+	const uint64_t c = opaque[CLB_MATCH_IDX];
+
+	if (c)
+		return (value & m) == v ? -1 : 0;
+	else
+		return (value & m) == v ? 0 : -1;
+}
+
+static int
+vhost_get_monitor_addr(void *rx_queue, struct rte_power_monitor_cond *pmc)
+{
+	struct vhost_queue *vq = rx_queue;
+	struct rte_vhost_power_monitor_cond vhost_pmc;
+	int ret;
+	if (vq == NULL)
+		return -EINVAL;
+	ret = rte_vhost_get_monitor_addr(vq->vid, vq->virtqueue_id,
+			&vhost_pmc);
+	if (ret < 0)
+		return -EINVAL;
+	pmc->addr = vhost_pmc.addr;
+	pmc->opaque[CLB_VAL_IDX] = vhost_pmc.val;
+	pmc->opaque[CLB_MSK_IDX] = vhost_pmc.mask;
+	pmc->opaque[CLB_MATCH_IDX] = vhost_pmc.match;
+	pmc->size = vhost_pmc.size;
+	pmc->fn = vhost_monitor_callback;
+
+	return 0;
+}
+
 static const struct eth_dev_ops ops = {
 	.dev_start = eth_dev_start,
 	.dev_stop = eth_dev_stop,
@@ -1399,6 +1438,7 @@ static const struct eth_dev_ops ops = {
 	.xstats_get_names = vhost_dev_xstats_get_names,
 	.rx_queue_intr_enable = eth_rxq_intr_enable,
 	.rx_queue_intr_disable = eth_rxq_intr_disable,
+	.get_monitor_addr = vhost_get_monitor_addr,
 };
 
 static int
-- 
2.25.1