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Date: Mon, 06 Aug 2012 16:52:36 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: Andy Cress <andy.cress@...kontron.com> Cc: netdev@...r.kernel.org Subject: RE: pch_gbe: dont-copy-payload (was [PATCH 1/4] ...) On Mon, 2012-08-06 at 07:19 -0700, Andy Cress wrote: > I found out why the proposed dont-copy-payload patch didn't work with > this pch_gbe NIC. > This NIC PHY requires 64-byte-aligned DMA, and the transmit buffers > won't be transferred if skb->data is not 64-byte-aligned. Apparently > the data copy has a by-product of aligning the buffers. > > I tried using skb_reserve(skb,64) in pch_gbe_alloc_tx_buffers and > pch-gbe_alloc_rx_buffers, but that didn't seem to resolve it. > > How can I make sure that the transmit data buffers are > 64-byte-aligned? > There is no support for such requirement in linux stacks. Only solution for the driver is to copy all frames to 64-byte-aligned bounce buffers. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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