tg3: Fix data corruption on 5725 with TSO

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@vger.kernel.org>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: Nithin Nayak Sujir <nsujir@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 781be76..e285d76 100644 (file)
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -7448,6 +7448,20 @@ 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 (tg3_asic_rev(tp) == 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)
@@ -7484,6 +7498,9 @@ 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;