Allow zero rx/tx queues to be passed to rte_eth_dev_configure(). This
way PF might be used only for configuration purpose when no receive
and/or transmit functionality is needed.
Rationale:
in SRIOV mode PF use first free VF to RX/TX (at least ixgbe based NICs).
For example: if using 82599EB based NIC and VF count is 16, 32 or 64 all
recources are assigned to VFs so PF might be used only for configuration
purpose.
Signed-off-by: Pawel Wodkowski <pawelx.wodkowski at intel.com>
---
lib/librte_ether/rte_ethdev.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 077d430..62d7f6e 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -333,7 +333,7 @@ rte_eth_dev_rx_queue_config(struct rte_eth_dev *dev,
uint16_t nb_queues)
dev->data->rx_queues = rte_zmalloc("ethdev->rx_queues",
sizeof(dev->data->rx_queues[0]) * nb_queues,
RTE_CACHE_LINE_SIZE);
- if (dev->data->rx_queues == NULL) {
+ if (dev->data->rx_queues == NULL && nb_queues > 0) {
dev->data->nb_rx_queues = 0;
return -(ENOMEM);
}
@@ -475,7 +475,7 @@ rte_eth_dev_tx_queue_config(struct rte_eth_dev *dev,
uint16_t nb_queues)
dev->data->tx_queues = rte_zmalloc("ethdev->tx_queues",
sizeof(dev->data->tx_queues[0]) * nb_queues,
RTE_CACHE_LINE_SIZE);
- if (dev->data->tx_queues == NULL) {
+ if (dev->data->tx_queues == NULL && nb_queues > 0) {
dev->data->nb_tx_queues = 0;
return -(ENOMEM);
}
@@ -731,7 +731,10 @@ rte_eth_dev_configure(uint8_t port_id, uint16_t nb_rx_q,
uint16_t nb_tx_q,
}
if (nb_rx_q == 0) {
PMD_DEBUG_TRACE("ethdev port_id=%d nb_rx_q == 0\n", port_id);
- return (-EINVAL);
+ /* In SRIOV there can be no free resource for PF. So permit use
only
+ * for configuration. */
+ if (RTE_ETH_DEV_SRIOV(dev).active == 0)
+ return (-EINVAL);
}
if (nb_tx_q > dev_info.max_tx_queues) {
@@ -739,9 +742,13 @@ rte_eth_dev_configure(uint8_t port_id, uint16_t nb_rx_q,
uint16_t nb_tx_q,
port_id, nb_tx_q, dev_info.max_tx_queues);
return (-EINVAL);
}
+
if (nb_tx_q == 0) {
PMD_DEBUG_TRACE("ethdev port_id=%d nb_tx_q == 0\n", port_id);
- return (-EINVAL);
+ /* In SRIOV there can be no free resource for PF. So permit use
only
+ * for configuration. */
+ if (RTE_ETH_DEV_SRIOV(dev).active == 0)
+ return (-EINVAL);
}
/* Copy the dev_conf parameter into the dev structure */
--
1.7.9.5
