[dpdk-dev] [PATCH] vhost: Fix retrieval of numa information in PMD

[Ciara Loftus <ciara.loftus@intel.com>]

After some testing, it was found that retrieving numa information
about a vhost device via a call to get_mempolicy is more
accurate when performed during the new_device callback versus
the vring_state_changed callback, in particular upon initial boot
of the VM.  Performing this check during new_device is also
potentially more efficient as this callback is only triggered once
during device initialisation, compared with vring_state_changed
which may be called multiple times depending on the number of
queues assigned to the device.

Reorganise the code to perform this check and assign the correct
socket_id to the device during the new_device callback.

Signed-off-by: Ciara Loftus <ciara.loftus@intel.com>
---
 drivers/net/vhost/rte_eth_vhost.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c
index 4cc6bec..b1eb082 100644
--- a/drivers/net/vhost/rte_eth_vhost.c
+++ b/drivers/net/vhost/rte_eth_vhost.c
@@ -229,6 +229,9 @@ new_device(struct virtio_net *dev)
 	struct pmd_internal *internal;
 	struct vhost_queue *vq;
 	unsigned i;
+#ifdef RTE_LIBRTE_VHOST_NUMA
+	int newnode, ret;
+#endif
 
 	if (dev == NULL) {
 		RTE_LOG(INFO, PMD, "Invalid argument\n");
@@ -244,6 +247,17 @@ new_device(struct virtio_net *dev)
 	eth_dev = list->eth_dev;
 	internal = eth_dev->data->dev_private;
 
+#ifdef RTE_LIBRTE_VHOST_NUMA
+	ret  = get_mempolicy(&newnode, NULL, 0, dev,
+			MPOL_F_NODE | MPOL_F_ADDR);
+	if (ret < 0) {
+		RTE_LOG(ERR, PMD, "Unknown numa node\n");
+		return -1;
+	}
+
+	eth_dev->data->numa_node = newnode;
+#endif
+
 	for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
 		vq = eth_dev->data->rx_queues[i];
 		if (vq == NULL)
@@ -352,9 +366,6 @@ vring_state_changed(struct virtio_net *dev, uint16_t vring, int enable)
 	struct rte_vhost_vring_state *state;
 	struct rte_eth_dev *eth_dev;
 	struct internal_list *list;
-#ifdef RTE_LIBRTE_VHOST_NUMA
-	int newnode, ret;
-#endif
 
 	if (dev == NULL) {
 		RTE_LOG(ERR, PMD, "Invalid argument\n");
@@ -370,17 +381,6 @@ vring_state_changed(struct virtio_net *dev, uint16_t vring, int enable)
 	eth_dev = list->eth_dev;
 	/* won't be NULL */
 	state = vring_states[eth_dev->data->port_id];
-
-#ifdef RTE_LIBRTE_VHOST_NUMA
-	ret  = get_mempolicy(&newnode, NULL, 0, dev,
-			MPOL_F_NODE | MPOL_F_ADDR);
-	if (ret < 0) {
-		RTE_LOG(ERR, PMD, "Unknown numa node\n");
-		return -1;
-	}
-
-	eth_dev->data->numa_node = newnode;
-#endif
 	rte_spinlock_lock(&state->lock);
 	state->cur[vring] = enable;
 	state->max_vring = RTE_MAX(vring, state->max_vring);
-- 
2.4.3