diff options
| author | Ben Hutchings <bhutchings@solarflare.com> | 2012-02-03 01:21:15 +0400 |
|---|---|---|
| committer | Ben Hutchings <bhutchings@solarflare.com> | 2012-02-14 03:40:49 +0400 |
| commit | 5b6262d0ccf759a16fabe11d904a2531125a4b71 (patch) | |
| tree | 812b2cab8bbeb0569909d8646ec864bef11c40c7 /drivers/net/ethernet | |
| parent | fadac6aae1b8d9344beaa18aa9035869d773fd98 (diff) | |
| download | linux-5b6262d0ccf759a16fabe11d904a2531125a4b71.tar.xz | |
sfc: Replace some literal constants with EFX_PAGE_SIZE/EFX_BUF_SIZE
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>
Diffstat (limited to 'drivers/net/ethernet')
| -rw-r--r-- | drivers/net/ethernet/sfc/nic.c | 5 | ||||
| -rw-r--r-- | drivers/net/ethernet/sfc/nic.h | 5 | ||||
| -rw-r--r-- | drivers/net/ethernet/sfc/tx.c | 2 |
3 files changed, 7 insertions, 5 deletions
diff --git a/drivers/net/ethernet/sfc/nic.c b/drivers/net/ethernet/sfc/nic.c index a43d1ca270c0..dd50c4f73a9d 100644 --- a/drivers/net/ethernet/sfc/nic.c +++ b/drivers/net/ethernet/sfc/nic.c @@ -54,9 +54,6 @@ #define EFX_FLUSH_INTERVAL 10 #define EFX_FLUSH_POLL_COUNT 100 -/* Size and alignment of special buffers (4KB) */ -#define EFX_BUF_SIZE 4096 - /* Depth of RX flush request fifo */ #define EFX_RX_FLUSH_COUNT 4 @@ -196,7 +193,7 @@ efx_init_special_buffer(struct efx_nic *efx, struct efx_special_buffer *buffer) /* Write buffer descriptors to NIC */ for (i = 0; i < buffer->entries; i++) { index = buffer->index + i; - dma_addr = buffer->dma_addr + (i * 4096); + dma_addr = buffer->dma_addr + (i * EFX_BUF_SIZE); netif_dbg(efx, probe, efx->net_dev, "mapping special buffer %d at %llx\n", index, (unsigned long long)dma_addr); diff --git a/drivers/net/ethernet/sfc/nic.h b/drivers/net/ethernet/sfc/nic.h index 905a1877d603..4f9d18ac92fe 100644 --- a/drivers/net/ethernet/sfc/nic.h +++ b/drivers/net/ethernet/sfc/nic.h @@ -65,6 +65,11 @@ enum { #define FALCON_GMAC_LOOPBACKS \ (1 << LOOPBACK_GMAC) +/* Alignment of PCIe DMA boundaries (4KB) */ +#define EFX_PAGE_SIZE 4096 +/* Size and alignment of buffer table entries (same) */ +#define EFX_BUF_SIZE EFX_PAGE_SIZE + /** * struct falcon_board_type - board operations and type information * @id: Board type id, as found in NVRAM diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c index 5cb81fa3fcbd..a096e287e95f 100644 --- a/drivers/net/ethernet/sfc/tx.c +++ b/drivers/net/ethernet/sfc/tx.c @@ -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)) |