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authorMatt Carlson <mcarlson@broadcom.com>2011-12-14 15:09:58 +0400
committerDavid S. Miller <davem@davemloft.net>2011-12-15 22:09:10 +0400
commita4cb428d31e11af1662e19c6fab9133c0f7a0eda (patch)
treefcf4cf8bf9f007549510f2d508b61c4c39ea7f7e /drivers/net/ethernet
parent4f272096054b6154e31e850f192eef5782f156c6 (diff)
downloadlinux-a4cb428d31e11af1662e19c6fab9133c0f7a0eda.tar.xz
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/ethernet')
-rw-r--r--drivers/net/ethernet/broadcom/tg3.c16
-rw-r--r--drivers/net/ethernet/broadcom/tg3.h1
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];