[dpdk-dev] olflags in SRIOV VF environment
Prashant Upadhyaya
prashant.upadhyaya at aricent.com
Tue Nov 12 14:44:18 CET 2013
Hi guys,
I am facing a peculiar issue with the usage of struct rte_mbuf-> ol_flags field in the rte_mbuf when I receive the packets with the rte_eth_rx_burst function.
I use the ol_flags field to identify whether is an IPv4 or IPv6 packet or not thus -
if ((pkts_burst->ol_flags & PKT_RX_IPV4_HDR) ||
(pkts_burst->ol_flags & PKT_RX_IPV6_HDR))
[pkts_burst is my rte_mbuf pointer]
Now here are the observations -
1. This works mighty fine when my app is working on the native machine
2. This works good when I run this in a VM and use one VF over SRIOV from one NIC port
3. This works good when I run this in two VM's and use one VF from 2 different NIC ports (one VF from each) and use these VF's in these 2 VM's (VF1 from NIC port1 in VM1 and VF2 from NIC port2 in VM2)
4. However the ol_flags fails to classify the packets when I use 2 VM's and use 2 VF's from the 'same' NIC port and expose one each to the 2 VM's I have
There is no bug in my 'own' application, because when I stopped inspecting the ol_flags for classification of IPv4 and V6 packets and wrote a mini logic of my own by inspecting the ether type of the packets (the packets themselves come proper in all the cases, thankfully), my entire usecase passes (it is a rather significant usecase, so it can't be luck)
Any idea guys why it works and doesn't work ?
Regards
-Prashant
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