IB/hfi1: Fix output trace issues from 16B change

The 16B changes to the output side of the header trace introduced
two issues:

1. An uninitialized field "l4" for 9B packets

   This field needs to be given a value of 0 for 9B
   packets to insure a correct 9B trace.

   The fix adds a new define to insure that there is a dummy
   default for 9B packets to insure the correct string
   is decoded.

2. Use of entry vs. __entry in field references

Fixes: Commit 863cf89d ("IB/hfi1: Add 16B trace support")
Reported-by: Kaike Wan <kaike.wan@intel.com>
Reviewed-by: Don Hiatt <don.hiatt@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/hfi1/hfi.h

@@ -390,6 +390,7 @@ struct hfi1_packet {
 /*
  * OPA 16B L2/L4 Encodings
  */
+#define OPA_16B_L4_9B		0x00
 #define OPA_16B_L2_TYPE		0x02
 #define OPA_16B_L4_IB_LOCAL	0x09
 #define OPA_16B_L4_IB_GLOBAL	0x0A

drivers/infiniband/hw/hfi1/trace_ibhdrs.h

@@ -334,7 +334,7 @@ DECLARE_EVENT_CLASS(hfi1_output_ibhdr_template,
 							 &__entry->dlid,
 							 &__entry->slid);
 
-				if (entry->l4 == OPA_16B_L4_IB_LOCAL)
+				if (__entry->l4 == OPA_16B_L4_IB_LOCAL)
 					ohdr = &opah->opah.u.oth;
 				else
 					ohdr = &opah->opah.u.l.oth;
@@ -348,6 +348,7 @@ DECLARE_EVENT_CLASS(hfi1_output_ibhdr_template,
 							 &__entry->psn,
 							 &__entry->qpn);
 			} else {
+				__entry->l4 = OPA_16B_L4_9B;
 				hfi1_trace_parse_9b_hdr(&opah->ibh, sc5,
 							&__entry->lnh,
 							&__entry->lver,
@@ -356,7 +357,7 @@ DECLARE_EVENT_CLASS(hfi1_output_ibhdr_template,
 							&__entry->len,
 							&__entry->dlid,
 							&__entry->slid);
-				if (entry->lnh == HFI1_LRH_BTH)
+				if (__entry->lnh == HFI1_LRH_BTH)
 					ohdr = &opah->ibh.u.oth;
 				else
 					ohdr = &opah->ibh.u.l.oth;