Re: [PATCH v3 for-next 01/33] IB/core: Add RoCE GID cache

[Or Gerlitz <gerlitz.or-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

On Thu, Mar 26, 2015 at 12:19 AM, Somnath Kotur
<somnath.kotur-laKkSmNT4hbQT0dZR+AlfA@public.gmane.org> wrote:
> From: Matan Barak <matanb-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
>
> In order to manage multiple types, vlans and MACs per GID, we
> need to store them along the GID itself. We store the net device
> as well, as sometimes GIDs should be handled according to the
> net device they came from. Since populating the GID table should
> be identical for every RoCE provider, the GIDs table should be
> handled in ib_core.
>
> Adding a GID cache table that supports a lockless find, add and
> delete gids. The lockless nature comes from using a unique
> sequence number per table entry and detecting that while reading/
> writing this sequence wasn't changed.

Matan, please use existing mechanism which fits the problem you are
trying to solve, I guess one of RCU or seqlock should do the job.

Or.
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