netdev - Re: [PATCH iproute2 2/3] utils: ll_map: Update name and type for existing entry

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Date:   Thu, 28 Dec 2017 20:22:53 +0200
From:   Serhey Popovych <serhe.popovych@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH iproute2 2/3] utils: ll_map: Update name and type for
 existing entry

Stephen Hemminger wrote:
> On Wed, 20 Dec 2017 09:37:30 +0200
> Serhey Popovych <serhe.popovych@...il.com> wrote:
> 
>> In case of we update existing entry we need not only rehash
>> but also update name in existing entry.
>>
>> Need to update device type too since cached interface might
>> be deleted and new with same index, but different type
>> added (e.g. eth0 and ppp0).
>>
>> Reuse new entry initialization path to avoid duplications.
>>
>> Signed-off-by: Serhey Popovych <serhe.popovych@...il.com>
> 
> Can you provide an example where this is an observed bug?
> I suspect that unless you use a batch mode command the reload
> of the cache on next invocation is solving this.
> 
From my side example from description is pretty clear: eth0 -> ppp0
or rename eth0 -> eth1, etc.

According to ll_remember_index() code we might be called with
non-empty cache. If ll_get_by_index() returns an entry with
name that differs from current we need:

  1. Rehash in ->name_hash (done with current code)
  2. Update entry name     (not done with current code)

That's my point of view.

Thanks.




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