mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-30 16:07:39 +00:00
Code Issues Releases Wiki Activity

tg3: Add workaround to restrict 5762 MRRS to 2048

Browse source 
One of AMD based server with 5762 hangs with jumbo frame traffic.
This AMD platform has southbridge limitation which is restricting MRRS
to 4000. As a work around, driver to restricts the MRRS to 2048 for
this particular 5762 NX1 card.

Signed-off-by: Siva Reddy Kallam <siva.kallam@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Siva Reddy Kallam 2017-12-22 16:05:28 +05:30 committed by David S. Miller
parent 5a8bae9761
commit 4419bb1ced
2 changed files with 14 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
drivers/net/ethernet/broadcom/tg3.c
View file

@ -10054,6 +10054,16 @@ static int tg3_reset_hw(struct tg3 *tp, bool reset_phy)
tw32(GRC_MODE, tp->grc_mode | val);
/* On one of the AMD platform, MRRS is restricted to 4000 because of
* south bridge limitation. As a workaround, Driver is setting MRRS
* to 2048 instead of default 4096.
*/
if (tp->pdev->subsystem_vendor == PCI_VENDOR_ID_DELL &&
tp->pdev->subsystem_device == TG3PCI_SUBDEVICE_ID_DELL_5762) {
val = tr32(TG3PCI_DEV_STATUS_CTRL) & ~MAX_READ_REQ_MASK;
tw32(TG3PCI_DEV_STATUS_CTRL, val | MAX_READ_REQ_SIZE_2048);
}
/* Setup the timer prescalar register. Clock is always 66Mhz. */
val = tr32(GRC_MISC_CFG);
val &= ~0xff;

4
drivers/net/ethernet/broadcom/tg3.h
View file

@ -97,6 +97,7 @@
#define TG3PCI_SUBDEVICE_ID_DELL_JAGUAR 0x0106
#define TG3PCI_SUBDEVICE_ID_DELL_MERLOT 0x0109
#define TG3PCI_SUBDEVICE_ID_DELL_SLIM_MERLOT 0x010a
#define TG3PCI_SUBDEVICE_ID_DELL_5762 0x07f0
#define TG3PCI_SUBVENDOR_ID_COMPAQ PCI_VENDOR_ID_COMPAQ
#define TG3PCI_SUBDEVICE_ID_COMPAQ_BANSHEE 0x007c
#define TG3PCI_SUBDEVICE_ID_COMPAQ_BANSHEE_2 0x009a
@ -282,6 +283,9 @@
#define TG3PCI_STD_RING_PROD_IDX 0x00000098 /* 64-bit */
#define TG3PCI_RCV_RET_RING_CON_IDX 0x000000a0 /* 64-bit */
/* 0xa8 --> 0xb8 unused */
#define TG3PCI_DEV_STATUS_CTRL 0x000000b4
#define MAX_READ_REQ_SIZE_2048 0x00004000
#define MAX_READ_REQ_MASK 0x00007000
#define TG3PCI_DUAL_MAC_CTRL 0x000000b8
#define DUAL_MAC_CTRL_CH_MASK 0x00000003
#define DUAL_MAC_CTRL_ID 0x00000004