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sfc: Move all TX DMA length limiting into tx.c

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Replace the duplicated logic in efx_enqueue_skb() and
efx_tx_queue_insert() with an inline function, efx_max_tx_len().

Remove the failed attempt at abstracting hardware-specifics and put
all the magic numbers in efx_max_tx_len().

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2009-10-23 08:31:20 +00:00 committed by David S. Miller
parent 6d51d30750
commit 63f1988419
4 changed files with 25 additions and 25 deletions
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7
drivers/net/sfc/falcon.c
View file

@ -127,9 +127,6 @@ MODULE_PARM_DESC(rx_xon_thresh_bytes, "RX fifo XON threshold");
**************************************************************************
*/
/* TX DMA length mask (13-bit) */
#define FALCON_TX_DMA_MASK (4096 - 1)
/* Size and alignment of special buffers (4KB) */
#define FALCON_BUF_SIZE 4096
@ -3146,8 +3143,6 @@ struct efx_nic_type falcon_a_nic_type = {
.evq_ptr_tbl_base = FR_AA_EVQ_PTR_TBL_KER,
.evq_rptr_tbl_base = FR_AA_EVQ_RPTR_KER,
.max_dma_mask = DMA_BIT_MASK(FSF_AZ_TX_KER_BUF_ADDR_WIDTH),
.tx_dma_mask = FALCON_TX_DMA_MASK,
.bug5391_mask = 0xf,
.rx_buffer_padding = 0x24,
.max_interrupt_mode = EFX_INT_MODE_MSI,
.phys_addr_channels = 4,
@ -3167,8 +3162,6 @@ struct efx_nic_type falcon_b_nic_type = {
.evq_ptr_tbl_base = FR_BZ_EVQ_PTR_TBL,
.evq_rptr_tbl_base = FR_BZ_EVQ_RPTR,
.max_dma_mask = DMA_BIT_MASK(FSF_AZ_TX_KER_BUF_ADDR_WIDTH),
.tx_dma_mask = FALCON_TX_DMA_MASK,
.bug5391_mask = 0,
.rx_buffer_padding = 0,
.max_interrupt_mode = EFX_INT_MODE_MSIX,
.phys_addr_channels = 32, /* Hardware limit is 64, but the legacy

4
drivers/net/sfc/net_driver.h
View file

@ -870,8 +870,6 @@ static inline const char *efx_dev_name(struct efx_nic *efx)
* @evq_ptr_tbl_base: Event queue pointer table base address
* @evq_rptr_tbl_base: Event queue read-pointer table base address
* @max_dma_mask: Maximum possible DMA mask
* @tx_dma_mask: TX DMA mask
* @bug5391_mask: Address mask for bug 5391 workaround
* @rx_buffer_padding: Padding added to each RX buffer
* @max_interrupt_mode: Highest capability interrupt mode supported
* from &enum efx_init_mode.
@ -888,8 +886,6 @@ struct efx_nic_type {
unsigned int evq_rptr_tbl_base;
u64 max_dma_mask;
unsigned int tx_dma_mask;
unsigned bug5391_mask;
unsigned int rx_buffer_padding;
unsigned int max_interrupt_mode;

37
drivers/net/sfc/tx.c
View file

@ -124,6 +124,24 @@ static void efx_tsoh_free(struct efx_tx_queue *tx_queue,
}
static inline unsigned
efx_max_tx_len(struct efx_nic *efx, dma_addr_t dma_addr)
{
/* Depending on the NIC revision, we can use descriptor
* lengths up to 8K or 8K-1. However, since PCI Express
* devices must split read requests at 4K boundaries, there is
* little benefit from using descriptors that cross those
* boundaries and we keep things simple by not doing so.
*/
unsigned len = (~dma_addr & 0xfff) + 1;
/* Work around hardware bug for unaligned buffers. */
if (EFX_WORKAROUND_5391(efx) && (dma_addr & 0xf))
len = min_t(unsigned, len, 512 - (dma_addr & 0xf));
return len;
}
/*
* Add a socket buffer to a TX queue
*
@ -146,7 +164,7 @@ static netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue,
skb_frag_t *fragment;
struct page *page;
int page_offset;
unsigned int len, unmap_len = 0, fill_level, insert_ptr, misalign;
unsigned int len, unmap_len = 0, fill_level, insert_ptr;
dma_addr_t dma_addr, unmap_addr = 0;
unsigned int dma_len;
bool unmap_single;
@ -223,14 +241,10 @@ static netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue,
EFX_BUG_ON_PARANOID(!buffer->continuation);
EFX_BUG_ON_PARANOID(buffer->unmap_len);
dma_len = (((~dma_addr) & efx->type->tx_dma_mask) + 1);
if (likely(dma_len > len))
dma_len = efx_max_tx_len(efx, dma_addr);
if (likely(dma_len >= len))
dma_len = len;
misalign = (unsigned)dma_addr & efx->type->bug5391_mask;
if (misalign && dma_len + misalign > 512)
dma_len = 512 - misalign;
/* Fill out per descriptor fields */
buffer->len = dma_len;
buffer->dma_addr = dma_addr;
@ -703,7 +717,7 @@ static int efx_tx_queue_insert(struct efx_tx_queue *tx_queue,
{
struct efx_tx_buffer *buffer;
struct efx_nic *efx = tx_queue->efx;
unsigned dma_len, fill_level, insert_ptr, misalign;
unsigned dma_len, fill_level, insert_ptr;
int q_space;
EFX_BUG_ON_PARANOID(len <= 0);
@ -752,12 +766,7 @@ static int efx_tx_queue_insert(struct efx_tx_queue *tx_queue,
buffer->dma_addr = dma_addr;
/* Ensure we do not cross a boundary unsupported by H/W */
dma_len = (~dma_addr & efx->type->tx_dma_mask) + 1;
misalign = (unsigned)dma_addr & efx->type->bug5391_mask;
if (misalign && dma_len + misalign > 512)
dma_len = 512 - misalign;
dma_len = efx_max_tx_len(efx, dma_addr);
/* If there is enough space to send then do so */
if (dma_len >= len)

2
drivers/net/sfc/workarounds.h
View file

@ -41,6 +41,8 @@
/* Spurious parity errors in TSORT buffers */
#define EFX_WORKAROUND_5129 EFX_WORKAROUND_FALCON_A
/* Unaligned read request >512 bytes after aligning may break TSORT */
#define EFX_WORKAROUND_5391 EFX_WORKAROUND_FALCON_A
/* iSCSI parsing errors */
#define EFX_WORKAROUND_5583 EFX_WORKAROUND_FALCON_A
/* RX events go missing */