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netdev-dpdk: Fix flow control not configuring.

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Currently OVS is unable to change flow control configuration in DPDK
because new settings are being overwritten by current settings with
rte_eth_dev_flow_ctrl_get(). The fix restores correct order of
operations and at the same time does not trigger error on devices
without flow control support when flow control not requested.

Fixes: 7e1de65e8dfb ("netdev-dpdk: Fix failure to configure flow control at netdev-init.")
Signed-off-by: Tomasz Konieczny <tomaszx.konieczny@intel.com>
Co-authored-by: Ilya Maximets <i.maximets@ovn.org>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
This commit is contained in:
Tomasz Konieczny 2019-09-12 12:43:20 +02:00 committed by Ilya Maximets
parent 13ede8c112
commit c2c84474d4
1 changed files with 26 additions and 6 deletions
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32
lib/netdev-dpdk.c
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@ -1774,6 +1774,7 @@ netdev_dpdk_set_config(struct netdev *netdev, const struct smap *args,
{
struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
bool rx_fc_en, tx_fc_en, autoneg, lsc_interrupt_mode;
bool flow_control_requested = true;
enum rte_eth_fc_mode fc_mode;
static const enum rte_eth_fc_mode fc_mode_set[2][2] = {
{RTE_FC_NONE, RTE_FC_TX_PAUSE},
@ -1861,15 +1862,34 @@ netdev_dpdk_set_config(struct netdev *netdev, const struct smap *args,
autoneg = smap_get_bool(args, "flow-ctrl-autoneg", false);
fc_mode = fc_mode_set[tx_fc_en][rx_fc_en];
if (!smap_get(args, "rx-flow-ctrl") && !smap_get(args, "tx-flow-ctrl")
&& !smap_get(args, "flow-ctrl-autoneg")) {
/* FIXME: User didn't ask for flow control configuration.
* For now we'll not print a warning if flow control is not
* supported by the DPDK port. */
flow_control_requested = false;
}
/* Get the Flow control configuration. */
err = -rte_eth_dev_flow_ctrl_get(dev->port_id, &dev->fc_conf);
if (err) {
if (err == ENOTSUP) {
if (flow_control_requested) {
VLOG_WARN("%s: Flow control is not supported.",
netdev_get_name(netdev));
}
err = 0; /* Not fatal. */
} else {
VLOG_WARN("%s: Cannot get flow control parameters: %s",
netdev_get_name(netdev), rte_strerror(err));
}
goto out;
}
if (dev->fc_conf.mode != fc_mode || autoneg != dev->fc_conf.autoneg) {
dev->fc_conf.mode = fc_mode;
dev->fc_conf.autoneg = autoneg;
/* Get the Flow control configuration for DPDK-ETH */
err = rte_eth_dev_flow_ctrl_get(dev->port_id, &dev->fc_conf);
if (err) {
VLOG_WARN("Cannot get flow control parameters on port "
DPDK_PORT_ID_FMT", err=%d", dev->port_id, err);
}
dpdk_eth_flow_ctrl_setup(dev);
}