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sfc: Replace some literal constants with EFX_PAGE_SIZE/EFX_BUF_SIZE

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The 'page size' for PCIe DMA, i.e. the alignment of boundaries at
which DMA must be broken, is 4KB.  Name this value as EFX_PAGE_SIZE
and use it in efx_max_tx_len().  Redefine EFX_BUF_SIZE as
EFX_PAGE_SIZE since its value is also a result of that requirement,
and use it in efx_init_special_buffer().

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Ben Hutchings
2012-02-02 21:21:15 +00:00
parent fadac6aae1
commit 5b6262d0cc
3 changed files with 7 additions and 5 deletions
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2
drivers/net/ethernet/sfc/tx.c
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@@ -110,7 +110,7 @@ efx_max_tx_len(struct efx_nic *efx, dma_addr_t dma_addr)
* little benefit from using descriptors that cross those
* boundaries and we keep things simple by not doing so.
*/
unsigned len = (~dma_addr & 0xfff) + 1;
unsigned len = (~dma_addr & (EFX_PAGE_SIZE - 1)) + 1;
/* Work around hardware bug for unaligned buffers. */
if (EFX_WORKAROUND_5391(efx) && (dma_addr & 0xf))