From: Stephen Hemminger <step...@networkplumber.org>
Date: Wed, 20 Sep 2017 11:17:35 -0700
> From: Alex Ng <ale...@microsoft.com>
>
> If MTU is changed the host would reject the send buffer change.
> This problem is result of recent change to allow changing send
> buffer size.
>
> Every time we change the MTU, we store the previous net_device section
> count before destroying the buffer, but we don’t store the previous
> section size. When we reinitialize the buffer, its size is calculated
> by multiplying the previous count and previous size. Since we
> continuously increase the MTU, the host returns us a decreasing count
> value while the section size is reinitialized to 1728 bytes every
> time.
>
> This eventually leads to a condition where the calculated buf_size is
> so small that the host rejects it.
>
> Fixes: 8b5327975ae1 ("netvsc: allow controlling send/recv buffer size")
> Signed-off-by: Alex Ng <ale...@microsoft.com>
> Signed-off-by: Stephen Hemminger <sthem...@microsoft.com>
Applied, thank you.
