diff options
| author | Matt Carlson <mcarlson@broadcom.com> | 2011-12-14 11:09:58 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-12-15 13:09:10 -0500 |
| commit | a4cb428d31e11af1662e19c6fab9133c0f7a0eda (patch) | |
| tree | fcf4cf8bf9f007549510f2d508b61c4c39ea7f7e /drivers/net | |
| parent | 4f272096054b6154e31e850f192eef5782f156c6 (diff) | |
| download | lwn-a4cb428d31e11af1662e19c6fab9133c0f7a0eda.tar.gz lwn-a4cb428d31e11af1662e19c6fab9133c0f7a0eda.zip | |
tg3: Make the TX BD DMA limit configurable
The 57766 ASIC rev will impose a new TX BD DMA limit on the driver.
This patch prepares for 57766 support by making the tx BD DMA limit
tunable.
Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Reviewed-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/ethernet/broadcom/tg3.c | 16 | ||||
| -rw-r--r-- | drivers/net/ethernet/broadcom/tg3.h | 1 |
2 files changed, 9 insertions, 8 deletions
diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c index 8a6ea1970ea7..9c9a4b4a9f69 100644 --- a/drivers/net/ethernet/broadcom/tg3.c +++ b/drivers/net/ethernet/broadcom/tg3.c @@ -199,7 +199,7 @@ static inline void _tg3_flag_clear(enum TG3_FLAGS flag, unsigned long *bits) /* minimum number of free TX descriptors required to wake up TX process */ #define TG3_TX_WAKEUP_THRESH(tnapi) ((tnapi)->tx_pending / 4) -#define TG3_TX_BD_DMA_MAX 4096 +#define TG3_TX_BD_DMA_MAX_4K 4096 #define TG3_RAW_IP_ALIGN 2 @@ -6449,17 +6449,17 @@ static bool tg3_tx_frag_set(struct tg3_napi *tnapi, u32 *entry, u32 *budget, if (tg3_40bit_overflow_test(tp, map, len)) hwbug = 1; - if (tg3_flag(tp, 4K_FIFO_LIMIT)) { + if (tp->dma_limit) { u32 prvidx = *entry; u32 tmp_flag = flags & ~TXD_FLAG_END; - while (len > TG3_TX_BD_DMA_MAX && *budget) { - u32 frag_len = TG3_TX_BD_DMA_MAX; - len -= TG3_TX_BD_DMA_MAX; + while (len > tp->dma_limit && *budget) { + u32 frag_len = tp->dma_limit; + len -= tp->dma_limit; /* Avoid the 8byte DMA problem */ if (len <= 8) { - len += TG3_TX_BD_DMA_MAX / 2; - frag_len = TG3_TX_BD_DMA_MAX / 2; + len += tp->dma_limit / 2; + frag_len = tp->dma_limit / 2; } tnapi->tx_buffers[*entry].fragmented = true; @@ -14041,7 +14041,7 @@ static int __devinit tg3_get_invariants(struct tg3 *tp) tg3_flag_set(tp, SHORT_DMA_BUG); if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5719) - tg3_flag_set(tp, 4K_FIFO_LIMIT); + tp->dma_limit = TG3_TX_BD_DMA_MAX_4K; if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5717 || GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5719 || diff --git a/drivers/net/ethernet/broadcom/tg3.h b/drivers/net/ethernet/broadcom/tg3.h index 9d9f6349cb8c..2ba5be16575b 100644 --- a/drivers/net/ethernet/broadcom/tg3.h +++ b/drivers/net/ethernet/broadcom/tg3.h @@ -2994,6 +2994,7 @@ struct tg3 { /* begin "tx thread" cacheline section */ void (*write32_tx_mbox) (struct tg3 *, u32, u32); + u32 dma_limit; /* begin "rx thread" cacheline section */ struct tg3_napi napi[TG3_IRQ_MAX_VECS]; |