ice: add tracepoints

This patch is modeled after one by Scott Peterson for i40e.

Add tracepoints to the driver, via a new file ice_trace.h and some new
trace calls added in interesting places in the driver. Add some tracing
for DIMLIB to help debug interrupt moderation problems.

Performance should not be affected, and this can be very useful
for debugging and adding new trace events to paths in the future.

Note eBPF programs can attach to these events, as well as perf
can count them since we're attaching to the events subsystem
in the kernel.

Co-developed-by: Ben Shelton <benjamin.h.shelton@intel.com>
Signed-off-by: Ben Shelton <benjamin.h.shelton@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 5c3ea504770a..b72ab9e97e79 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -13,6 +13,12 @@
 #include "ice_dcb_lib.h"
 #include "ice_dcb_nl.h"
 #include "ice_devlink.h"
+/* Including ice_trace.h with CREATE_TRACE_POINTS defined will generate the
+ * ice tracepoint functions. This must be done exactly once across the
+ * ice driver.
+ */
+#define CREATE_TRACE_POINTS
+#include "ice_trace.h"
 
 #define DRV_SUMMARY	"Intel(R) Ethernet Connection E800 Series Linux Driver"
 static const char ice_driver_string[] = DRV_SUMMARY;
@@ -5477,6 +5483,7 @@ static void ice_tx_dim_work(struct work_struct *work)
 	itr = tx_profile[dim->profile_ix].itr;
 	intrl = tx_profile[dim->profile_ix].intrl;
 
+	ice_trace(tx_dim_work, q_vector, dim);
 	ice_write_itr(rc, itr);
 	ice_write_intrl(q_vector, intrl);
 
@@ -5501,6 +5508,7 @@ static void ice_rx_dim_work(struct work_struct *work)
 	itr = rx_profile[dim->profile_ix].itr;
 	intrl = rx_profile[dim->profile_ix].intrl;
 
+	ice_trace(rx_dim_work, q_vector, dim);
 	ice_write_itr(rc, itr);
 	ice_write_intrl(q_vector, intrl);