netdev - RE: [PATCH 02/25 v2] mlx4_core: add support for arbitrary bitmap sizes

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Date:	Thu, 4 Feb 2010 16:15:31 +0200
From:	Yevgeny Petrilin <yevgenyp@...lanox.co.il>
To:	Roland Dreier <rdreier@...co.com>
CC:	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Liran Liss <liranl@...lanox.co.il>,
	Tziporet Koren <tziporet@...lanox.co.il>
Subject: RE: [PATCH 02/25 v2] mlx4_core: add support for arbitrary bitmap
 sizes

>> +int mlx4_bitmap_init_no_mask(struct mlx4_bitmap *bitmap, u32 num,
>> +			     u32 reserved_bot, u32 reserved_top)
>> +{
>> +	u32 num_rounded = roundup_pow_of_two(num);
>> +	return mlx4_bitmap_init(bitmap, num_rounded, num_rounded - 1,
>> +				reserved_bot, num_rounded - num + reserved_top);
>> +}
>
> I think I would really prefer things if we got rid of this wrapper.  The mlx4_bitmap stuff is really there to handle the case where we want to have a 
> mask and have the non-used bits cycle to avoid reusing QPN etc.
> If we have a bitmap with no mask that's no a power of 2 in size, there's really no value in the mlx4 wrapper -- we might as well just allocate a bitmap > directly.
>
> And since this is only used in one place (for the EQ tables) I think it makes sense to just open-code everything in the EQ code.

I am preparing a new set of patches for SRIOV support, this change will be included--
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