[Differential] [Commented On] D1986: Teach lagg(4) to change MTU

[rpokala-panasas.com (Ravi Pokala)]

rpokala-panasas.com added a comment.

>>! In D1986#4, @ae wrote:
> Just a thought. Imagine two interfaces, one has maximum MTU 2200, another 1500. lagg0 has MTU 1400.
> Two threads invokes changing MTU in the same time. One wants to change it to 2000, another - to 1500.
> It is possible, that when both threads will finish its job, one interface will have MTU 1400, but another - 1500.
> I mean, that such changes should be done exclusively without possibility of races in the ioctl code.

Don't the calls to LAGG_RLOCK() / LAGG_RUNLOCK() prevent that by enforcing serialization?

REVISION DETAIL
  https://reviews.freebsd.org/D1986

To: rpokala-panasas.com, rstone
Cc: ae, freebsd-net