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tg3: Allow DMAs to cross cacheline boundaries 

By default, the 5717 (and future chips) break up PCIe DMA packets across
cacheline boundaries.  This isn't necessary on x86.  This patch
selectively loosens the restriction.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Matt Carlson 2009-11-13 13:03:40 +00:00 committed by David S. Miller
parent 615774fe59
commit cbf9ca6cf8
2 changed files with 16 additions and 7 deletions
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20
drivers/net/tg3.c
View File

@ -7294,9 +7294,12 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy)
if (err)
return err;
if (GET_ASIC_REV(tp->pci_chip_rev_id) != ASIC_REV_5784 &&
GET_ASIC_REV(tp->pci_chip_rev_id) != ASIC_REV_5761 &&
GET_ASIC_REV(tp->pci_chip_rev_id) != ASIC_REV_5717) {
if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5717) {
val = tr32(TG3PCI_DMA_RW_CTRL) &
~DMA_RWCTRL_DIS_CACHE_ALIGNMENT;
tw32(TG3PCI_DMA_RW_CTRL, val | tp->dma_rwctrl);
} else if (GET_ASIC_REV(tp->pci_chip_rev_id) != ASIC_REV_5784 &&
GET_ASIC_REV(tp->pci_chip_rev_id) != ASIC_REV_5761) {
/* This value is determined during the probe time DMA
* engine test, tg3_test_dma.
*/
@ -13329,6 +13332,11 @@ static u32 __devinit tg3_calc_dma_bndry(struct tg3 *tp, u32 val)
#endif
#endif
if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5717) {
val = goal ? 0 : DMA_RWCTRL_DIS_CACHE_ALIGNMENT;
goto out;
}
if (!goal)
goto out;
@ -13523,7 +13531,7 @@ static int __devinit tg3_test_dma(struct tg3 *tp)
{
dma_addr_t buf_dma;
u32 *buf, saved_dma_rwctrl;
int ret;
int ret = 0;
buf = pci_alloc_consistent(tp->pdev, TEST_BUFFER_SIZE, &buf_dma);
if (!buf) {
@ -13536,6 +13544,9 @@ static int __devinit tg3_test_dma(struct tg3 *tp)
tp->dma_rwctrl = tg3_calc_dma_bndry(tp, tp->dma_rwctrl);
if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5717)
goto out;
if (tp->tg3_flags2 & TG3_FLG2_PCI_EXPRESS) {
/* DMA read watermark not used on PCIE */
tp->dma_rwctrl |= 0x00180000;
@ -13608,7 +13619,6 @@ static int __devinit tg3_test_dma(struct tg3 *tp)
tg3_switch_clocks(tp);
#endif
ret = 0;
if (GET_ASIC_REV(tp->pci_chip_rev_id) != ASIC_REV_5700 &&
GET_ASIC_REV(tp->pci_chip_rev_id) != ASIC_REV_5701)
goto out;

3
drivers/net/tg3.h
View File

@ -142,8 +142,7 @@
#define METAL_REV_B1 0x01
#define METAL_REV_B2 0x02
#define TG3PCI_DMA_RW_CTRL 0x0000006c
#define DMA_RWCTRL_MIN_DMA 0x000000ff
#define DMA_RWCTRL_MIN_DMA_SHIFT 0
#define DMA_RWCTRL_DIS_CACHE_ALIGNMENT 0x00000001
#define DMA_RWCTRL_READ_BNDRY_MASK 0x00000700
#define DMA_RWCTRL_READ_BNDRY_DISAB 0x00000000
#define DMA_RWCTRL_READ_BNDRY_16 0x00000100