Messages in this thread | | | Subject | Re: [PATCH 3/3 v2] net/macb: Try to optimize struct macb layout | From | Ben Hutchings <> | Date | Mon, 17 Dec 2012 13:52:25 +0000 |
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On Mon, 2012-12-17 at 14:01 +0100, Nicolas Ferre wrote: > From: Havard Skinnemoen <havard@skinnemoen.net> > > Move TX-related fields to the top of the struct so that they end up on > the same cache line. Move the NAPI struct below that since it is used > from the interrupt handler. RX-related fields go below those.
> Move the spinlock before regs since they are usually used together. > > Signed-off-by: Havard Skinnemoen <havard@skinnemoen.net> > [nicolas.ferre@atmel.com: adapt to newer kernel] > Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> > --- > drivers/net/ethernet/cadence/macb.h | 25 +++++++++++++------------ > 1 file changed, 13 insertions(+), 12 deletions(-) > > diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h > index cef146f..aeeb729 100644 > --- a/drivers/net/ethernet/cadence/macb.h > +++ b/drivers/net/ethernet/cadence/macb.h > @@ -548,38 +548,39 @@ struct macb_or_gem_ops { > }; > > struct macb { > + spinlock_t lock; > void __iomem *regs; > > + unsigned int tx_head; > + unsigned int tx_tail; > + struct macb_dma_desc *tx_ring; > + struct macb_tx_skb *tx_skb; > + dma_addr_t tx_ring_dma; > + struct work_struct tx_error_task; > + > + struct napi_struct napi; [...]
If this driver may be used on SMP systems them 'napi' should be declared with the suffix ___cacheline_aligned_in_smp.
Ben.
-- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked.
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