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tg3: 5701 DMA corruption fix 

Herbert Xu's commit fb93134dfc, entitled
"[TCP]: Fix size calculation in sk_stream_alloc_pskb", has triggered a
bug in the 5701 where the 5701 DMA engine will corrupt outgoing
packets.  This problem only happens when the starting address of the
packet matches a certain range of offsets and only when the 5701 is
placed downstream of a particular Intel bridge.

This patch detects the problematic bridge and if present, readjusts the
starting address of the packet data to a dword aligned boundary.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Matt Carlson 2008-04-19 18:12:33 -07:00 committed by David S. Miller
parent 36ef408061
commit 41588ba1ae
2 changed files with 49 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
drivers/net/tg3.c
View File

@ -64,8 +64,8 @@
#define DRV_MODULE_NAME "tg3"
#define PFX DRV_MODULE_NAME ": "
#define DRV_MODULE_VERSION "3.90"
#define DRV_MODULE_RELDATE "April 12, 2008"
#define DRV_MODULE_VERSION "3.91"
#define DRV_MODULE_RELDATE "April 18, 2008"
#define TG3_DEF_MAC_MODE 0
#define TG3_DEF_RX_MODE 0
@ -4135,11 +4135,21 @@ static int tigon3_dma_hwbug_workaround(struct tg3 *tp, struct sk_buff *skb,
u32 last_plus_one, u32 *start,
u32 base_flags, u32 mss)
{
struct sk_buff *new_skb = skb_copy(skb, GFP_ATOMIC);
struct sk_buff *new_skb;
dma_addr_t new_addr = 0;
u32 entry = *start;
int i, ret = 0;
if (GET_ASIC_REV(tp->pci_chip_rev_id) != ASIC_REV_5701)
new_skb = skb_copy(skb, GFP_ATOMIC);
else {
int more_headroom = 4 - ((unsigned long)skb->data & 3);
new_skb = skb_copy_expand(skb,
skb_headroom(skb) + more_headroom,
skb_tailroom(skb), GFP_ATOMIC);
}
if (!new_skb) {
ret = -1;
} else {
@ -4462,7 +4472,9 @@ static int tg3_start_xmit_dma_bug(struct sk_buff *skb, struct net_device *dev)
would_hit_hwbug = 0;
if (tg3_4g_overflow_test(mapping, len))
if (tp->tg3_flags3 & TG3_FLG3_5701_DMA_BUG)
would_hit_hwbug = 1;
else if (tg3_4g_overflow_test(mapping, len))
would_hit_hwbug = 1;
tg3_set_txd(tp, entry, mapping, len, base_flags,
@ -11339,6 +11351,38 @@ static int __devinit tg3_get_invariants(struct tg3 *tp)
}
}
if ((GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5701)) {
static struct tg3_dev_id {
u32 vendor;
u32 device;
} bridge_chipsets[] = {
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PXH_0 },
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PXH_1 },
{ },
};
struct tg3_dev_id *pci_id = &bridge_chipsets[0];
struct pci_dev *bridge = NULL;
while (pci_id->vendor != 0) {
bridge = pci_get_device(pci_id->vendor,
pci_id->device,
bridge);
if (!bridge) {
pci_id++;
continue;
}
if (bridge->subordinate &&
(bridge->subordinate->number <=
tp->pdev->bus->number) &&
(bridge->subordinate->subordinate >=
tp->pdev->bus->number)) {
tp->tg3_flags3 |= TG3_FLG3_5701_DMA_BUG;
pci_dev_put(bridge);
break;
}
}
}
/* The EPB bridge inside 5714, 5715, and 5780 cannot support
* DMA addresses > 40-bit. This bridge may have other additional
* 57xx devices behind it in some 4-port NIC designs for example.

1
drivers/net/tg3.h
View File

@ -2476,6 +2476,7 @@ struct tg3 {
#define TG3_FLG3_NO_NVRAM_ADDR_TRANS 0x00000001
#define TG3_FLG3_ENABLE_APE 0x00000002
#define TG3_FLG3_5761_5784_AX_FIXES 0x00000004
#define TG3_FLG3_5701_DMA_BUG 0x00000008
struct timer_list timer;
u16 timer_counter;