[VPP-1865] dpdk { num-rx-queues N } - N should be power of 2

[vvalderrv]

Description

In startup.conf, when configuring

{{dpdk { num-rx-queues N }}}

using a value of N that is not a power of 2 will cause VPP to abort.

The following backtrace is seen with N=3:

Thread 1 "vpp_main" received signal SIGSEGV, Segmentation fault.

0x00007fffb3a44200 in ?? () from /usr/lib/x86_64-linux-gnu/vpp_plugins/dpdk_plugin.so

(gdb)

(gdb) bt

#0 0x00007fffb3a44200 in ?? () from /usr/lib/x86_64-linux-gnu/vpp_plugins/dpdk_plugin.so

#1 0x00007fffb3a44679 in ?? () from /usr/lib/x86_64-linux-gnu/vpp_plugins/dpdk_plugin.so

#2 0x00007fffb3a44f2e in ?? () from /usr/lib/x86_64-linux-gnu/vpp_plugins/dpdk_plugin.so

#3 0x00007fffb3177fb3 in rte_eth_stats_get () from /usr/lib/x86_64-linux-gnu/vpp_plugins/dpdk_plugin.so

#4 0x00007fffb427b90f in ?? () from /usr/lib/x86_64-linux-gnu/vpp_plugins/dpdk_plugin.so

#5 0x00007fffb42847f0 in ?? () from /usr/lib/x86_64-linux-gnu/vpp_plugins/dpdk_plugin.so

#6 0x00007ffff6408a4b in ?? () from /usr/lib/x86_64-linux-gnu/libvlib.so.0.0.10

#7 0x00007ffff5ea8d40 in clib_calljmp () from /usr/lib/x86_64-linux-gnu/libvppinfra.so.0.0.10

#8 0x00007fffb51c8bb0 in ?? ()

#9 0x00007ffff6408b53 in ?? () from /usr/lib/x86_64-linux-gnu/libvlib.so.0.0.10

Backtrace stopped: previous frame inner to this frame (corrupt stack?)

(gdb) frame 3

#3 0x00007fffb3177fb3 in rte_eth_stats_get () from /usr/lib/x86_64-linux-gnu/vpp_plugins/dpdk_plugin.so

 

Enforcing N to be a power of 2 would be good (or at least mentioning it somewhere in the documentation).

Assignee

Unassigned

Reporter

Ajit Thyagarajan

Comments

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Original issue: https://jira.fd.io/browse/VPP-1865