[ovs-dev] [PATCHv3] netdev-dpdk: Fix failure to configure flow control at netdev-init.

Sugesh Chandran sugesh.chandran at intel.com
Tue Jul 31 11:04:32 UTC 2018


Configuring flow control at ixgbe netdev-init is throwing error in port
start.

For eg: without this fix, user cannot configure flow control on ixgbe dpdk
port as below,

"
    ovs-vsctl add-port br0 dpdk0 -- set Interface dpdk0 type=dpdk \
        options:dpdk-devargs=0000:05:00.1 options:rx-flow-ctrl=true
"

Instead,  it must be configured as two different commands,

"
    ovs-vsctl add-port br0 dpdk0 -- set Interface dpdk0 type=dpdk \
               options:dpdk-devargs=0000:05:00.1
    ovs-vsctl set Interface dpdk0 options:rx-flow-ctrl=true
"

The DPDK ixgbe driver is now validating all the 'rte_eth_fc_conf' fields before
trying to configuring the dpdk ethdev. Hence OVS can no longer set the
'dont care' fields to just '0' as before. This commit make sure all the
'rte_eth_fc_conf' fields are populated with default values before the dev
init.
Also to avoid read error on unsupported ports, the flow control parameters
are now read only when user is trying to configure/update it.

Signed-off-by: Sugesh Chandran <sugesh.chandran at intel.com>
---
V1 -> V2
Read DPDK port flow-control parameters only when reconfiguration is required.
This will avoid flow control read error on unsupported ports.

V2 -> V3
 Minor modifications to incorporate review comments from Ian.
 Merged to latest master.

---
 lib/netdev-dpdk.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c
index 9bf2185..e40b03a 100644
--- a/lib/netdev-dpdk.c
+++ b/lib/netdev-dpdk.c
@@ -1065,14 +1065,6 @@ dpdk_eth_dev_init(struct netdev_dpdk *dev)
 
     mbp_priv = rte_mempool_get_priv(dev->dpdk_mp->mp);
     dev->buf_size = mbp_priv->mbuf_data_room_size - RTE_PKTMBUF_HEADROOM;
-
-    /* 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 "DPDK_PORT_ID_FMT
-                 ", err=%d", dev->port_id, diag);
-    }
-
     return 0;
 }
 
@@ -1776,6 +1768,12 @@ netdev_dpdk_set_config(struct netdev *netdev, const struct smap *args,
     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);
     }
 
-- 
2.7.4



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