be2net: fix a Tx stall bug caused by a specific ipv6 packet

The ASIC could lockup in the transmit path when it tries
to insert VLAN in a specific ipv6 packet.
1) Identify the packet which can cause this.
2) Check if the firmware provides a workaround to prevent this.
3) If workaround is not present, drop the packet.
4) If the firmware provides a workaround, insert the VLAN tag in the
packet and inform the firmware to skip further VLAN insertions.

Signed-off-by: Ajit Khaparde <ajit.khaparde@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/net/ethernet/emulex/benet/be_cmds.h b/drivers/net/ethernet/emulex/benet/be_cmds.h
index 96970860c915..07fd9277d3cb 100644
--- a/drivers/net/ethernet/emulex/benet/be_cmds.h
+++ b/drivers/net/ethernet/emulex/benet/be_cmds.h
@@ -84,6 +84,9 @@ struct be_mcc_compl {
 #define ASYNC_EVENT_QOS_SPEED		0x1
 #define ASYNC_EVENT_COS_PRIORITY	0x2
 #define ASYNC_EVENT_PVID_STATE		0x3
+#define ASYNC_EVENT_CODE_QNQ		0x6
+#define ASYNC_DEBUG_EVENT_TYPE_QNQ	1
+
 struct be_async_event_trailer {
 	u32 code;
 };
@@ -144,6 +147,16 @@ struct be_async_event_grp5_pvid_state {
 	struct be_async_event_trailer trailer;
 } __packed;
 
+/* async event indicating outer VLAN tag in QnQ */
+struct be_async_event_qnq {
+	u8 valid;	/* Indicates if outer VLAN is valid */
+	u8 rsvd0;
+	u16 vlan_tag;
+	u32 event_tag;
+	u8 rsvd1[4];
+	struct be_async_event_trailer trailer;
+} __packed;
+
 struct be_mcc_mailbox {
 	struct be_mcc_wrb wrb;
 	struct be_mcc_compl compl;