[realtek] Allow extra space in RX buffers

Some hardware (observed with an onboard RTL8168) will erroneously report a buffer overflow error if the received packet exactly fills the receive buffer. Fix by adding an extra four bytes of padding to each receive buffer. Debugged-by: Thomas Miletich <thomas.miletich@gmail.com> Signed-off-by: Michael Brown <mcb30@ipxe.org>
ipxe · Jul 15, 2013 · 918fb43 · 918fb43
1 parent 75bd5b5
commit 918fb43
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/drivers/net/realtek.h b/src/drivers/net/realtek.h
@@ -226,7 +226,8 @@ enum realtek_legacy_status {
 #define RTL_NUM_RX_DESC 4
 
 /** Receive buffer length */
-#define RTL_RX_MAX_LEN ( ETH_FRAME_LEN + 4 /* VLAN */ + 4 /* CRC */ )
+#define RTL_RX_MAX_LEN \
+	( ETH_FRAME_LEN + 4 /* VLAN */ + 4 /* CRC */ + 4 /* extra space */ )
 
 /** A Realtek descriptor ring */
 struct realtek_ring {