diff options
| author |   Vince Bridgers <vbridger@altera.com> | 2014-04-24 16:58:08 -0500 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2014-04-26 12:26:26 -0400 |
| commit | 37c0ffaad21401eacc6618a121cc2c501131026f (patch) | |
| tree | d76882b5f858e65c591d3e10f82ef19167d045f6 /drivers/net/ethernet/altera/altera_tse.h | |
| parent | Merge branch 'bnx2x-net' (diff) | |
| download | linux-dev-37c0ffaad21401eacc6618a121cc2c501131026f.tar.xz linux-dev-37c0ffaad21401eacc6618a121cc2c501131026f.zip | |
Altera TSE: Work around unaligned DMA receive packet issue with Altera SGDMA
This patch works around a recently discovered unaligned receive dma problem
with the Altera SGMDA. The Altera SGDMA component cannot be configured to
DMA data to unaligned addresses for receive packet operations from the
Triple Speed Ethernet component because of a potential data transfer
corruption that can occur. This patch addresses this issue by
utilizing the shift 16 bits feature of the Altera Triple Speed Ethernet
component and modifying the receive buffer physical addresses accordingly
such that the target receive DMA address is always aligned on a 32-bit
boundary.
Signed-off-by: Vince Bridgers <vbridgers2013@gmail.com>
Tested-by: Matthew Gerlach <mgerlach@altera.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/altera/altera_tse.h')
| -rw-r--r-- | drivers/net/ethernet/altera/altera_tse.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/net/ethernet/altera/altera_tse.h b/drivers/net/ethernet/altera/altera_tse.h index 8feeed05de0e..6059a09bb8ae 100644 --- a/drivers/net/ethernet/altera/altera_tse.h +++ b/drivers/net/ethernet/altera/altera_tse.h @@ -390,10 +390,11 @@ struct altera_dmaops { void (*clear_rxirq)(struct altera_tse_private *); int (*tx_buffer)(struct altera_tse_private *, struct tse_buffer *); u32 (*tx_completions)(struct altera_tse_private *); - int (*add_rx_desc)(struct altera_tse_private *, struct tse_buffer *); + void (*add_rx_desc)(struct altera_tse_private *, struct tse_buffer *); u32 (*get_rx_status)(struct altera_tse_private *); int (*init_dma)(struct altera_tse_private *); void (*uninit_dma)(struct altera_tse_private *); + void (*start_rxdma)(struct altera_tse_private *); }; /* This structure is private to each device. @@ -453,6 +454,7 @@ struct altera_tse_private { u32 rxctrlreg; dma_addr_t rxdescphys; dma_addr_t txdescphys; + size_t sgdmadesclen; struct list_head txlisthd; struct list_head rxlisthd; |