summaryrefslogtreecommitdiffstats
path: root/drivers/net/tulip/tulip.h
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/net/tulip/tulip.h')
-rw-r--r--drivers/net/tulip/tulip.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/net/tulip/tulip.h b/drivers/net/tulip/tulip.h
index 3f69f53d7768..908422f2f320 100644
--- a/drivers/net/tulip/tulip.h
+++ b/drivers/net/tulip/tulip.h
@@ -268,7 +268,12 @@ enum t21143_csr6_bits {
#define RX_RING_SIZE 128
#define MEDIA_MASK 31
-#define PKT_BUF_SZ 1536 /* Size of each temporary Rx buffer. */
+/* The receiver on the DC21143 rev 65 can fail to close the last
+ * receive descriptor in certain circumstances (see errata) when
+ * using MWI. This can only occur if the receive buffer ends on
+ * a cache line boundary, so the "+ 4" below ensures it doesn't.
+ */
+#define PKT_BUF_SZ (1536 + 4) /* Size of each temporary Rx buffer. */
#define TULIP_MIN_CACHE_LINE 8 /* in units of 32-bit words */