Add support for flow-control(mac control frame) to DPDK enabled physical
port types. By default, the flow-control is OFF on both rx and tx side.
The flow control can be enabled/disabled either when adding a port to OVS
or at run time.
For eg:
To enable flow control support at tx side while adding a port, add the
'tx-flow-ctrl' option to the 'ovs-vsctl add-port' command-line as below.
'ovs-vsctl add-port br0 dpdk0 -- \
set Interface dpdk0 type=dpdk options:tx-flow-ctrl=on'
Similarly to enable rx flow control,
'ovs-vsctl add-port br0 dpdk0 -- \
set Interface dpdk0 type=dpdk options:rx-flow-ctrl=on'
And to enable the flow control auto-negotiation,
'ovs-vsctl add-port br0 dpdk0 -- \
set Interface dpdk0 type=dpdk options:flow-ctrl-autoneg=on'
To turn ON the tx flow control at run time(After the port is being added
to OVS), the command-line input will be,
'ovs-vsctl set Interface dpdk0 options:tx-flow-ctrl=on'
The flow control parameters can be turned off by setting 'off' to the
respective parameter. To turn off the flow control at tx side,
'ovs-vsctl set Interface dpdk0 options:tx-flow-ctrl=off'
Signed-off-by: Sugesh Chandran <sugesh.chand...@intel.com>
---
lib/netdev-dpdk.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 68 insertions(+)
diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c
index 85b18fd..74efd25 100644
--- a/lib/netdev-dpdk.c
+++ b/lib/netdev-dpdk.c
@@ -634,6 +634,67 @@ dpdk_eth_dev_queue_setup(struct netdev_dpdk *dev, int
n_rxq, int n_txq)
return diag;
}
+static void
+dpdk_eth_parse_flow_ctrl(struct netdev_dpdk *dev,
+ const struct smap *args,
+ struct rte_eth_fc_conf *fc_conf)
+ OVS_REQUIRES(dev->mutex)
+{
+ int ret = 0;
+ int rx_fc_en = 0;
+ int tx_fc_en = 0;
+ const char *rx_flow_mode;
+ const char *tx_flow_mode;
+ const char *flow_autoneg;
+ enum rte_eth_fc_mode fc_mode_set[2][2] = {{RTE_FC_NONE, RTE_FC_TX_PAUSE},
+ {RTE_FC_RX_PAUSE, RTE_FC_FULL}
+ };
+
+ ret = rte_eth_dev_flow_ctrl_get(dev->port_id, fc_conf);
+ if (ret != 0) {
+ VLOG_DBG("cannot get flow control parameters on port=%d, err=%s",
+ dev->port_id, rte_strerror(ret));
+ return;
+ }
+ rx_flow_mode = smap_get(args, "rx-flow-ctrl");
+ tx_flow_mode = smap_get(args, "tx-flow-ctrl");
+ flow_autoneg = smap_get(args, "flow-ctrl-autoneg");
+ if (rx_flow_mode) {
+ if (!strcmp(rx_flow_mode, "on")) {
+ rx_fc_en = 1;
+ }
+ else if (!strcmp(rx_flow_mode, "off")) {
+ rx_fc_en = 0;
+ }
+ }
+ if (tx_flow_mode) {
+ if (!strcmp(tx_flow_mode, "on")) {
+ tx_fc_en =1;
+ }
+ else if (!strcmp(tx_flow_mode, "off")) {
+ tx_fc_en =0;
+ }
+ }
+ if (flow_autoneg) {
+ if (!strcmp(flow_autoneg, "on")) {
+ fc_conf->autoneg = 1;
+ }
+ else if (!strcmp(flow_autoneg, "off")) {
+ fc_conf->autoneg = 0;
+ }
+ }
+ fc_conf->mode = fc_mode_set[tx_fc_en][rx_fc_en];
+}
+
+static void
+dpdk_eth_flow_ctrl_config(struct netdev_dpdk *dev,
+ struct rte_eth_fc_conf *fc_conf)
+ OVS_REQUIRES(dev->mutex)
+{
+ if (rte_eth_dev_flow_ctrl_set(dev->port_id, fc_conf) != 0) {
+ VLOG_ERR("Failed to enable flow control on device %d", dev->port_id);
+ }
+}
static int
dpdk_eth_dev_init(struct netdev_dpdk *dev) OVS_REQUIRES(dpdk_mutex)
@@ -991,6 +1052,13 @@ netdev_dpdk_set_config(struct netdev *netdev, const
struct smap *args)
dev->requested_n_rxq = new_n_rxq;
netdev_request_reconfigure(netdev);
}
+
+ /* Flow control configuration for DPDK Ethernet ports. */
+ if (dev->type == DPDK_DEV_ETH) {
+ struct rte_eth_fc_conf fc_conf = {0};
+ dpdk_eth_parse_flow_ctrl(dev, args, &fc_conf);
+ dpdk_eth_flow_ctrl_config(dev, &fc_conf);
+ }
ovs_mutex_unlock(&dev->mutex);
return 0;
--
2.5.0
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