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, 9 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
index e9e9edb32c6f..a63d5916ebb0 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
@@ -10,6 +10,7 @@
 #include "ice_txrx_lib.h"
 #include "ice_lib.h"
 #include "ice.h"
+#include "ice_trace.h"
 #include "ice_dcb_lib.h"
 #include "ice_xsk.h"
 
@@ -224,6 +225,7 @@ static bool ice_clean_tx_irq(struct ice_ring *tx_ring, int napi_budget)
 
 		smp_rmb();	/* prevent any other reads prior to eop_desc */
 
+		ice_trace(clean_tx_irq, tx_ring, tx_desc, tx_buf);
 		/* if the descriptor isn't done, no work yet to do */
 		if (!(eop_desc->cmd_type_offset_bsz &
 		      cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE)))
@@ -254,6 +256,7 @@ static bool ice_clean_tx_irq(struct ice_ring *tx_ring, int napi_budget)
 
 		/* unmap remaining buffers */
 		while (tx_desc != eop_desc) {
+			ice_trace(clean_tx_irq_unmap, tx_ring, tx_desc, tx_buf);
 			tx_buf++;
 			tx_desc++;
 			i++;
@@ -272,6 +275,7 @@ static bool ice_clean_tx_irq(struct ice_ring *tx_ring, int napi_budget)
 				dma_unmap_len_set(tx_buf, len, 0);
 			}
 		}
+		ice_trace(clean_tx_irq_unmap_eop, tx_ring, tx_desc, tx_buf);
 
 		/* move us one more past the eop_desc for start of next pkt */
 		tx_buf++;
@@ -1102,6 +1106,7 @@ int ice_clean_rx_irq(struct ice_ring *rx_ring, int budget)
 		 */
 		dma_rmb();
 
+		ice_trace(clean_rx_irq, rx_ring, rx_desc);
 		if (rx_desc->wb.rxdid == FDIR_DESC_RXDID || !rx_ring->netdev) {
 			struct ice_vsi *ctrl_vsi = rx_ring->vsi;
 
@@ -1207,6 +1212,7 @@ construct_skb:
 
 		ice_process_skb_fields(rx_ring, rx_desc, skb, rx_ptype);
 
+		ice_trace(clean_rx_irq_indicate, rx_ring, rx_desc, skb);
 		/* send completed skb up the stack */
 		ice_receive_skb(rx_ring, skb, vlan_tag);
 		skb = NULL;
@@ -2188,6 +2194,8 @@ ice_xmit_frame_ring(struct sk_buff *skb, struct ice_ring *tx_ring)
 	unsigned int count;
 	int tso, csum;
 
+	ice_trace(xmit_frame_ring, tx_ring, skb);
+
 	count = ice_xmit_desc_count(skb);
 	if (ice_chk_linearize(skb, count)) {
 		if (__skb_linearize(skb))
@@ -2262,6 +2270,7 @@ ice_xmit_frame_ring(struct sk_buff *skb, struct ice_ring *tx_ring)
 	return NETDEV_TX_OK;
 
 out_drop:
+	ice_trace(xmit_frame_ring_drop, tx_ring, skb);
 	dev_kfree_skb_any(skb);
 	return NETDEV_TX_OK;
 }