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Re: [PATCH v4 net-next 8/9] net: add a hardware buffer management helper API

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Hi Gregory,


> +int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num, gfp_t gfp)
> +{
> +       int err, i;
> +       unsigned long flags;
> +
> +       spin_lock_irqsave(&bm_pool->lock, flags);
> +       if (bm_pool->buf_num == bm_pool->size) {

'size' field is used as a 'frag_size' but here it means pool capacity.
I think it's better to keep 'size' for pool capacity and add
'buf_size' field to struct hwbm_pool.

> +               pr_warn("pool already filled\n");
> +               return bm_pool->buf_num;
> +       }
> +
> +       if (buf_num + bm_pool->buf_num > bm_pool->size) {
> +               pr_warn("cannot allocate %d buffers for pool\n",
> +                       buf_num);
> +               return 0;
> +       }
> +
> +       if ((buf_num + bm_pool->buf_num) < bm_pool->buf_num) {

What is a point of this condition? How possibly after checking if
capacity of pool is not exceeded, this one would ever be true?

> +               pr_warn("Adding %d buffers to the %d current buffers will overflow\n",
> +                       buf_num,  bm_pool->buf_num);
> +               return 0;
> +       }
> +

Best regards,
Marcin

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[PATCH v4 net-next 0/9] API set for HW Buffer management Gregory CLEMENT <gregory.clement@free-electrons.com> - 2016-03-05 23:40 +0100
  [PATCH v4 net-next 9/9] net: mvneta: Use the new hwbm framework Gregory CLEMENT <gregory.clement@free-electrons.com> - 2016-03-05 23:40 +0100
  [PATCH v4 net-next 4/9] ARM: dts: armada-xp: enable buffer manager support on Armada XP boards Gregory CLEMENT <gregory.clement@free-electrons.com> - 2016-03-05 23:40 +0100
  [PATCH v4 net-next 3/9] ARM: dts: armada-xp: add buffer manager nodes Gregory CLEMENT <gregory.clement@free-electrons.com> - 2016-03-05 23:40 +0100
  [PATCH v4 net-next 2/9] ARM: dts: armada-38x: enable buffer manager support on Armada 38x boards Gregory CLEMENT <gregory.clement@free-electrons.com> - 2016-03-05 23:40 +0100
    Re: [PATCH v4 net-next 2/9] ARM: dts: armada-38x: enable buffer  manager support on Armada 38x boards Russell King - ARM Linux <linux@arm.linux.org.uk> - 2016-03-06 21:40 +0100
  [PATCH v4 net-next 8/9] net: add a hardware buffer management helper API Gregory CLEMENT <gregory.clement@free-electrons.com> - 2016-03-05 23:40 +0100
    Re: [PATCH v4 net-next 8/9] net: add a hardware buffer management  helper API Marcin Wojtas <mw@semihalf.com> - 2016-03-06 20:30 +0100
      Re: [PATCH v4 net-next 8/9] net: add a hardware buffer management helper API Gregory CLEMENT <gregory.clement@free-electrons.com> - 2016-03-07 09:20 +0100
  [PATCH v4 net-next 5/9] ARM: dts: armada-xp-openblocks-ax3-4: Add BM support Gregory CLEMENT <gregory.clement@free-electrons.com> - 2016-03-05 23:50 +0100
  [PATCH v4 net-next 1/9] ARM: dts: armada-38x: add buffer manager nodes Gregory CLEMENT <gregory.clement@free-electrons.com> - 2016-03-05 23:50 +0100
  [PATCH v4 net-next 6/9] bus: mvebu-mbus: provide api for obtaining IO and DRAM window information Gregory CLEMENT <gregory.clement@free-electrons.com> - 2016-03-05 23:50 +0100

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