netdev - RE: [PATCH] qlcnic: dma address align check

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Message-ID: <99737F4847ED0A48AECC9F4A1974A4B80F871A8182@MNEXMB2.qlogic.org>
Date:	Tue, 26 Oct 2010 05:52:13 -0500
From:	Amit Salecha <amit.salecha@...gic.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Ameen Rahman <ameen.rahman@...gic.com>,
	Anirban Chakraborty <anirban.chakraborty@...gic.com>
Subject: RE: [PATCH] qlcnic: dma address align check

> > Is pci_alloc_consistent guarantee to give PAGE align dma address ?
> 
> I believe so
> 
> By the way, you should use dma_alloc_coherent() instead of
> pci_alloc_consistent() so that you can use GFP_KERNEL allocations
> instead of GFP_ATOMIC, it might help in low memory conditions (if you
> dont hold a spinlock at this point)
> 
> 
> If TX_DESC_RINGSIZE(tx_ring) is not a power of two, then yes you could
> probably add 64 bytes and avoid allocating a full page only for the u32
> field ;)
> 
> 

TX_DESC_RINGSIZE is power of two.

If pci_alloc_consistent guarantee to give PAGE align dma address, then this patch is not required.
>