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netdev-dpdk: Add Flow Control support.

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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=true'

Similarly to enable rx flow control,
 'ovs-vsctl add-port br0 dpdk0 -- \
  set Interface dpdk0 type=dpdk options:rx-flow-ctrl=true'

And to enable the flow control auto-negotiation,
 'ovs-vsctl add-port br0 dpdk0 -- \
  set Interface dpdk0 type=dpdk options:flow-ctrl-autoneg=true'

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=true'

The flow control parameters can be turned off by setting 'false' to the
respective parameter. To dsiable the flow control at tx side,
 'ovs-vsctl set Interface dpdk0 options:tx-flow-ctrl=false'

Signed-off-by: Sugesh Chandran <sugesh.chandran@intel.com>
Acked-by: Bhanuprakash Bodireddy <Bhanuprakash.bodireddy@intel.com>
Signed-off-by: Daniele Di Proietto <diproiettod@vmware.com>
This commit is contained in:
Sugesh Chandran
2016-07-28 16:30:12 +01:00
committed by Daniele Di Proietto
parent 5a27991d1a
commit 9fd39370c1
4 changed files with 98 additions and 2 deletions
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36
lib/netdev-dpdk.c
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@@ -375,6 +375,9 @@ struct netdev_dpdk {
OVSRCU_TYPE(struct ingress_policer *) ingress_policer;
uint32_t policer_rate;
uint32_t policer_burst;
/* DPDK-ETH Flow control */
struct rte_eth_fc_conf fc_conf;
};
struct netdev_rxq_dpdk {
@@ -628,6 +631,13 @@ dpdk_eth_dev_queue_setup(struct netdev_dpdk *dev, int n_rxq, int n_txq)
return diag;
}
static void
dpdk_eth_flow_ctrl_setup(struct netdev_dpdk *dev) OVS_REQUIRES(dev->mutex)
{
if (rte_eth_dev_flow_ctrl_set(dev->port_id, &dev->fc_conf)) {
VLOG_WARN("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)
@@ -676,6 +686,14 @@ dpdk_eth_dev_init(struct netdev_dpdk *dev) OVS_REQUIRES(dpdk_mutex)
dev->buf_size = mbp_priv->mbuf_data_room_size - RTE_PKTMBUF_HEADROOM;
dev->flags = NETDEV_UP | NETDEV_PROMISC;
/* Get the Flow control configuration for DPDK-ETH */
diag = rte_eth_dev_flow_ctrl_get(dev->port_id, &dev->fc_conf);
if (diag) {
VLOG_DBG("cannot get flow control parameters on port=%d, err=%d",
dev->port_id, diag);
}
return 0;
}
@@ -765,6 +783,8 @@ netdev_dpdk_init(struct netdev *netdev, unsigned int port_no,
dev->requested_n_rxq = netdev->n_rxq;
dev->requested_n_txq = netdev->n_txq;
/* Initialize the flow control to NULL */
memset(&dev->fc_conf, 0, sizeof dev->fc_conf);
if (type == DPDK_DEV_ETH) {
err = dpdk_eth_dev_init(dev);
if (err) {
@@ -983,6 +1003,22 @@ 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) {
bool rx_fc_en = false;
bool tx_fc_en = false;
enum rte_eth_fc_mode fc_mode_set[2][2] =
{{RTE_FC_NONE, RTE_FC_TX_PAUSE},
{RTE_FC_RX_PAUSE, RTE_FC_FULL}
};
rx_fc_en = smap_get_bool(args, "rx-flow-ctrl", false);
tx_fc_en = smap_get_bool(args, "tx-flow-ctrl", false);
dev->fc_conf.autoneg = smap_get_bool(args, "flow-ctrl-autoneg", false);
dev->fc_conf.mode = fc_mode_set[tx_fc_en][rx_fc_en];
dpdk_eth_flow_ctrl_setup(dev);
}
ovs_mutex_unlock(&dev->mutex);
return 0;