* [dpdk-dev] [Bug 399] ixgbe X540 PMD RSS is zero for NFSv3 NULL reply
@ 2020-02-13 22:34 bugzilla
0 siblings, 0 replies; only message in thread
From: bugzilla @ 2020-02-13 22:34 UTC (permalink / raw)
Bug ID: 399
Summary: ixgbe X540 PMD RSS is zero for NFSv3 NULL reply
Target Milestone: ---
Created attachment 84
tcpdump -i eth3 -w /tmp/client80.mount.pcap host 10.240.160.1
We see packets with rte_mbuf.hash.rss == 0 for NFSv3 NULL reply packets, and
NFSv3 NFSACL reply packets, but all other packets appear correct.
Attached is a pcap, which when replayed through DPDK 18.11.3 having a copper
X540-based 10GbE NIC should show the zero RSS hashes for a restricted set of
packets. It is okay on others, but an NFSv3 mount command will have its frames
directed to the wrong core due to rte_mbuf.hash.rss == 0.
This problem does NOT exhibit with the 82599 ixgbe PMD.
If you open this pcap with wireshark, this filter expression will limit your
view to only those packets that get a zero RSS hash. All other packets in this
pcap had correct RSS values in rte_mbuf.hash.rss.
rpc.procedure == 0 and rpc.msgtyp == 1 and (tcp.port == 2049)
This will select packets: 20, 44, 71, 91, 118, 138, 165, 185, 211, 230, 256,
275, 301, 320, 346, 365, 391, 410, 436, 455. Each of these packets had
rte_mbuf.hash.rss == 0. All other packets had valid hash.rss values.
The attached pcap holds the traffic as seen by the client, generated by this
seq 10 | while read a; do sudo time mount -t nfs -o vers=3 10.240.160.1:/jot
/mnt/daveb; sudo umount /mnt/daveb; done
Our application is a bump-on-the-wire between client and server. All packets
flow through our box (and DPDK 18.11.3) both directions. The only packets with
a bad RSS are those indicated above. The NIC in our box is (from kern.log):
Feb 7 16:43:06 firefly kernel: PE310G4BPi40T found, firmware version: 0xac
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2020-02-13 22:34 [dpdk-dev] [Bug 399] ixgbe X540 PMD RSS is zero for NFSv3 NULL reply bugzilla
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