IB/hfi1: Optimize process_receive_ib()

The arguments for trace_hfi1_rcvhdr() get computed every
time in the hot path regardless of the whether the trace
is on or off. This is seen to be costly with a profile.
The handling of fault inject isolates the verbs device for
all packets regardless of the presence of a RHF_DC_ERR error.

Fix the first by computing trace_hfi1_rcvhdr() arguments within
the trace itself, so that when the trace is off, the argument
data isn't computed. Fix the second by moving the error check to
handle_eflags() when an RHF error occurs and by testing for
RHF_DC_ERR before executing the reset of handle_eflags().

Reviewed-by: Don Hiatt <don.hiatt@intel.com>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Sebastian Sanchez <sebastian.sanchez@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

1 files changed, 7 insertions, 14 deletions

diff --git a/drivers/infiniband/hw/hfi1/driver.c b/drivers/infiniband/hw/hfi1/driver.c
index 0a9bc1875d53..98703f1ce7ac 100644
--- a/drivers/infiniband/hw/hfi1/driver.c
+++ b/drivers/infiniband/hw/hfi1/driver.c
@@ -256,7 +256,12 @@ static void rcv_hdrerr(struct hfi1_ctxtdata *rcd, struct hfi1_pportdata *ppd,
 	u32 mlid_base;
 	struct hfi1_ibport *ibp = rcd_to_iport(rcd);
 	struct hfi1_devdata *dd = ppd->dd;
-	struct rvt_dev_info *rdi = &dd->verbs_dev.rdi;
+	struct hfi1_ibdev *verbs_dev = &dd->verbs_dev;
+	struct rvt_dev_info *rdi = &verbs_dev->rdi;
+
+	if ((packet->rhf & RHF_DC_ERR) &&
+	    hfi1_dbg_fault_suppress_err(verbs_dev))
+		return;
 
 	if (packet->rhf & (RHF_VCRC_ERR | RHF_ICRC_ERR))
 		return;
@@ -1552,19 +1557,7 @@ int process_receive_ib(struct hfi1_packet *packet)
 	if (hfi1_setup_9B_packet(packet))
 		return RHF_RCV_CONTINUE;
 
-	trace_hfi1_rcvhdr(packet->rcd->ppd->dd,
-			  packet->rcd->ctxt,
-			  rhf_err_flags(packet->rhf),
-			  RHF_RCV_TYPE_IB,
-			  packet->hlen,
-			  packet->tlen,
-			  packet->updegr,
-			  rhf_egr_index(packet->rhf));
-
-	if (unlikely(
-		 (hfi1_dbg_fault_suppress_err(&packet->rcd->dd->verbs_dev) &&
-		 (packet->rhf & RHF_DC_ERR))))
-		return RHF_RCV_CONTINUE;
+	trace_hfi1_rcvhdr(packet, RHF_RCV_TYPE_IB);
 
 	if (unlikely(rhf_err_flags(packet->rhf))) {
 		handle_eflags(packet);