netdev - Re: [PATCH net 2/4] qed: fix handling of concurrent ramrods

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Date:	Fri, 04 Dec 2015 14:34:15 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	manish.chopra@...gic.com
Cc:	netdev@...r.kernel.org, Ariel.Elior@...gic.com,
	Yuval.Mintz@...gic.com, Tomer.Tayar@...gic.com
Subject: Re: [PATCH net 2/4] qed: fix handling of concurrent ramrods

From: Manish Chopra <manish.chopra@...gic.com>
Date: Thu, 3 Dec 2015 05:59:14 -0500

> @@ -124,8 +124,19 @@ struct qed_spq {
>  	dma_addr_t		p_phys;
>  	struct qed_spq_entry	*p_virt;
>  
> -	/* Used as index for completions (returns on EQ by FW) */
> -	u16			echo_idx;
> +	/* Bitmap for handling out-of-order completions */
> +#define SPQ_RING_SIZE \
> +	(CORE_SPQE_PAGE_SIZE_BYTES / sizeof(struct slow_path_element))
> +#define SPQ_COMP_BMAP_SIZE	(SPQ_RING_SIZE / BITS_PER_LONG)
> +	unsigned long		p_comp_bitmap[SPQ_COMP_BMAP_SIZE];
> +	u8			comp_bitmap_idx;
> +
> +#define SPQ_COMP_BMAP_SET_BIT(p_spq, idx)	\
> +	__set_bit((idx) % SPQ_RING_SIZE, (p_spq)->p_comp_bitmap)
> +#define SPQ_COMP_BMAP_CLEAR_BIT(p_spq, idx)	\
> +	__clear_bit((idx) % SPQ_RING_SIZE, (p_spq)->p_comp_bitmap)
> +#define SPQ_COMP_BMAP_TEST_BIT(p_spq, idx)	\
> +	test_bit((idx) % SPQ_RING_SIZE, (p_spq)->p_comp_bitmap)
>  

Don't invent stuff we already have ifrastructure for.

Use DECLARE_BITMAP(), and the helpers, as necessary, in linux/bitmap.h
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