[019/141] tg3: Fix data corruption on 5725 with TSO

[Steven Rostedt]

3.6.11.6 stable review patch.
If anyone has any objections, please let me know.

------------------

From: Michael Chan <mchan@xxxxxxxxxxxx>

[ Upstream commit 0f0d15100a8ac875bdd408324c473e16d73d3557 ]

The 5725 family of devices (asic rev 5762), corrupts TSO packets where
the buffer is within MSS bytes of a 4G boundary (4G, 8G etc.). Detect
this condition and trigger the workaround path.

Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Michael Chan <mchan@xxxxxxxxxxxx>
Signed-off-by: Nithin Nayak Sujir <nsujir@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
 drivers/net/ethernet/broadcom/tg3.c |   17 +++++++++++++++++
 drivers/net/ethernet/broadcom/tg3.h |    1 +
 2 files changed, 18 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index f0f26b0..1e7f1a8 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -6772,6 +6772,20 @@ static inline int tg3_4g_overflow_test(dma_addr_t mapping, int len)
 	return (base > 0xffffdcc0) && (base + len + 8 < base);
 }
 
+/* Test for TSO DMA buffers that cross into regions which are within MSS bytes
+ * of any 4GB boundaries: 4G, 8G, etc
+ */
+static inline int tg3_4g_tso_overflow_test(struct tg3 *tp, dma_addr_t mapping,
+					   u32 len, u32 mss)
+{
+	if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5762 && mss) {
+		u32 base = (u32) mapping & 0xffffffff;
+
+		return ((base + len + (mss & 0x3fff)) < base);
+	}
+	return 0;
+}
+
 /* Test for DMA addresses > 40-bit */
 static inline int tg3_40bit_overflow_test(struct tg3 *tp, dma_addr_t mapping,
 					  int len)
@@ -6808,6 +6822,9 @@ static bool tg3_tx_frag_set(struct tg3_napi *tnapi, u32 *entry, u32 *budget,
 	if (tg3_4g_overflow_test(map, len))
 		hwbug = true;
 
+	if (tg3_4g_tso_overflow_test(tp, map, len, mss))
+		hwbug = true;
+
 	if (tg3_40bit_overflow_test(tp, map, len))
 		hwbug = true;
 
diff --git a/drivers/net/ethernet/broadcom/tg3.h b/drivers/net/ethernet/broadcom/tg3.h
index 3a58339..0f8e583 100644
--- a/drivers/net/ethernet/broadcom/tg3.h
+++ b/drivers/net/ethernet/broadcom/tg3.h
@@ -168,6 +168,7 @@
 #define   ASIC_REV_USE_PROD_ID_REG	 0x0f
 #define   ASIC_REV_5784			 0x5784
 #define   ASIC_REV_5761			 0x5761
+#define   ASIC_REV_5762			 0x5762
 #define   ASIC_REV_5785			 0x5785
 #define   ASIC_REV_57780		 0x57780
 #define   ASIC_REV_5717			 0x5717
-- 
1.7.10.4


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