Primary process broadcasts vdevs during each secondary's vdev scan

https://bugs.dpdk.org/show_bug.cgi?id=84

Bug ID: 84
Summary: Primary process broadcasts vdevs during each
secondary's vdev scan
Product: DPDK
Version: unspecified
Hardware: All
OS: All
Status: CONFIRMED
Severity: minor
Priority: Normal
Component: core
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---

A secondary process running vdev_scan() (drivers/bus/vdev/vdev.c) requests the primary to send the vdevs that the primary was given in its EAL args*. The primary process then receives this request and calls rte_mp_sendmsg() (once per vdev) to send the vdev information back to the secondary process.

The problem is that rte_mp_sendmsg() broadcasts this information to all secondaries, so any existing secondary processes will attempt to re-insert the vdev with insert_vdev(), fail, then report the error message "failed to add vdev, <vdev name>". This is harmless, as far as I can tell, but the message makes its seem as though a serious error has occurred.

Ideally the primary would send a unicast message to the requesting secondary.

*Introduced in commit cdb068f031c6 ("bus/vdev: scan by multi-process channel").

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