[PATCH 5/9] tg3: Turn off multiple DMA reads for 5717
From: Matt Carlson <hidden>
Date: 2010-02-13 00:47:33
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
The 5717's DMA read engine has a bug when initiating multiple DMA reads across the PCIe bus. This patch disables the feature. Signed-off-by: Matt Carlson <redacted> Reviewed-by: Michael Chan <mchan@broadcom.com> Reviewed-by: Benjamin Li <redacted> --- drivers/net/tg3.c | 3 +++ drivers/net/tg3.h | 1 + 2 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index d1452d3..1c545a8 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c@@ -7915,6 +7915,9 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy) RDMAC_MODE_FIFOURUN_ENAB | RDMAC_MODE_FIFOOREAD_ENAB | RDMAC_MODE_LNGREAD_ENAB); + if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5717) + rdmac_mode |= RDMAC_MODE_MULT_DMA_RD_DIS; + if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5784 || GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5785 || GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_57780)
diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index 46db4ad..a8fb53a 100644
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h@@ -1258,6 +1258,7 @@ #define RDMAC_MODE_MBUF_SBD_CRPT_ENAB 0x00002000 #define RDMAC_MODE_FIFO_SIZE_128 0x00020000 #define RDMAC_MODE_FIFO_LONG_BURST 0x00030000 +#define RDMAC_MODE_MULT_DMA_RD_DIS 0x01000000 #define RDMAC_MODE_IPV4_LSO_EN 0x08000000 #define RDMAC_MODE_IPV6_LSO_EN 0x10000000 #define RDMAC_STATUS 0x00004804
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1.6.4.4