[for-next,2/9] IB/hfi1: Add fast and slow handlers for receive context

Commit Message

Dennis Dalessandro Jan. 6, 2020, 1:41 p.m. UTC

From: Mike Marciniszyn <[e-mail]>

This patch eliminate special cases by adding a fast_handler member to
the receive context and changes to the fast handler as specified in the
new variable. Initialize the variable as soon as the setting for dma
tail is known when the context is created.

Setting fast path is called every time when any context has entered
slow path. Add function to check if contexts is using fast path and do
not set fast path when it is already done to improve RCD fastpath
setting.

Reviewed-by: Dennis Dalessandro <[e-mail]>
Reviewed-by: Michael J. Ruhl <[e-mail]>
Signed-off-by: Grzegorz Andrejczuk <[e-mail]>
Signed-off-by: Sadanand Warrier <[e-mail]>
Signed-off-by: Mike Marciniszyn <[e-mail]>
Signed-off-by: Kaike Wan <[e-mail]>
Signed-off-by: Dennis Dalessandro <[e-mail]>
---
 drivers/infiniband/hw/hfi1/driver.c   |   66 ++++++---------------------------
 drivers/infiniband/hw/hfi1/hfi.h      |   41 ++++++++++++++++++++-
 drivers/infiniband/hw/hfi1/init.c     |    5 +++
 drivers/infiniband/hw/hfi1/trace_rx.h |    6 +--
 4 files changed, 58 insertions(+), 60 deletions(-)

Patch

diff --git a/drivers/infiniband/hw/hfi1/driver.c b/drivers/infiniband/hw/hfi1/driver.c
index 8374922..3671191 100644
--- a/drivers/infiniband/hw/hfi1/driver.c
+++ b/drivers/infiniband/hw/hfi1/driver.c
@@ -883,9 +883,8 @@  int handle_receive_interrupt_dma_rtail(struct hfi1_ctxtdata *rcd, int thread)
 	return last;
 }
 
-static inline void set_nodma_rtail(struct hfi1_devdata *dd, u16 ctxt)
+static void set_all_fastpath(struct hfi1_devdata *dd, struct hfi1_ctxtdata *rcd)
 {
-	struct hfi1_ctxtdata *rcd;
 	u16 i;
 
 	/*
@@ -893,50 +892,17 @@  static inline void set_nodma_rtail(struct hfi1_devdata *dd, u16 ctxt)
 	 * interrupt handler only for that context. Otherwise, switch
 	 * interrupt handler for all statically allocated kernel contexts.
 	 */
-	if (ctxt >= dd->first_dyn_alloc_ctxt) {
-		rcd = hfi1_rcd_get_by_index_safe(dd, ctxt);
-		if (rcd) {
-			rcd->do_interrupt =
-				&handle_receive_interrupt_nodma_rtail;
-			hfi1_rcd_put(rcd);
-		}
-		return;
-	}
-
-	for (i = HFI1_CTRL_CTXT + 1; i < dd->first_dyn_alloc_ctxt; i++) {
-		rcd = hfi1_rcd_get_by_index(dd, i);
-		if (rcd)
-			rcd->do_interrupt =
-				&handle_receive_interrupt_nodma_rtail;
+	if (rcd->ctxt >= dd->first_dyn_alloc_ctxt && !rcd->is_vnic) {
+		hfi1_rcd_get(rcd);
+		hfi1_set_fast(rcd);
 		hfi1_rcd_put(rcd);
-	}
-}
-
-static inline void set_dma_rtail(struct hfi1_devdata *dd, u16 ctxt)
-{
-	struct hfi1_ctxtdata *rcd;
-	u16 i;
-
-	/*
-	 * For dynamically allocated kernel contexts (like vnic) switch
-	 * interrupt handler only for that context. Otherwise, switch
-	 * interrupt handler for all statically allocated kernel contexts.
-	 */
-	if (ctxt >= dd->first_dyn_alloc_ctxt) {
-		rcd = hfi1_rcd_get_by_index_safe(dd, ctxt);
-		if (rcd) {
-			rcd->do_interrupt =
-				&handle_receive_interrupt_dma_rtail;
-			hfi1_rcd_put(rcd);
-		}
 		return;
 	}
 
-	for (i = HFI1_CTRL_CTXT + 1; i < dd->first_dyn_alloc_ctxt; i++) {
+	for (i = HFI1_CTRL_CTXT + 1; i < dd->num_rcv_contexts; i++) {
 		rcd = hfi1_rcd_get_by_index(dd, i);
-		if (rcd)
-			rcd->do_interrupt =
-				&handle_receive_interrupt_dma_rtail;
+		if (rcd && (i < dd->first_dyn_alloc_ctxt || rcd->is_vnic))
+			hfi1_set_fast(rcd);
 		hfi1_rcd_put(rcd);
 	}
 }
@@ -952,7 +918,7 @@  void set_all_slowpath(struct hfi1_devdata *dd)
 		if (!rcd)
 			continue;
 		if (i < dd->first_dyn_alloc_ctxt || rcd->is_vnic)
-			rcd->do_interrupt = &handle_receive_interrupt;
+			rcd->do_interrupt = rcd->slow_handler;
 
 		hfi1_rcd_put(rcd);
 	}
@@ -1065,11 +1031,6 @@  int handle_receive_interrupt(struct hfi1_ctxtdata *rcd, int thread)
 		if (!get_dma_rtail_setting(rcd)) {
 			if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf)))
 				last = RCV_PKT_DONE;
-			if (needset) {
-				dd_dev_info(dd, "Switching to NO_DMA_RTAIL\n");
-				set_nodma_rtail(dd, rcd->ctxt);
-				needset = 0;
-			}
 		} else {
 			if (packet.rhqoff == hdrqtail)
 				last = RCV_PKT_DONE;
@@ -1085,15 +1046,12 @@  int handle_receive_interrupt(struct hfi1_ctxtdata *rcd, int thread)
 				if (!last && lseq)
 					skip_pkt = 1;
 			}
-
-			if (needset) {
-				dd_dev_info(dd,
-					    "Switching to DMA_RTAIL\n");
-				set_dma_rtail(dd, rcd->ctxt);
-				needset = 0;
-			}
 		}
 
+		if (needset) {
+			needset = false;
+			set_all_fastpath(dd, rcd);
+		}
 		process_rcv_update(last, &packet);
 	}
 
diff --git a/drivers/infiniband/hw/hfi1/hfi.h b/drivers/infiniband/hw/hfi1/hfi.h
index d662fcc..0c643bc 100644
--- a/drivers/infiniband/hw/hfi1/hfi.h
+++ b/drivers/infiniband/hw/hfi1/hfi.h
@@ -197,6 +197,8 @@  struct exp_tid_set {
 	u32 count;
 };
 
+struct hfi1_ctxtdata;
+typedef int (*intr_handler)(struct hfi1_ctxtdata *rcd, int data);
 typedef int (*rhf_rcv_function_ptr)(struct hfi1_packet *packet);
 
 struct tid_queue {
@@ -226,7 +228,11 @@  struct hfi1_ctxtdata {
 	 * be valid. Worst case is we process an extra interrupt and up to 64
 	 * packets with the wrong interrupt handler.
 	 */
-	int (*do_interrupt)(struct hfi1_ctxtdata *rcd, int threaded);
+	intr_handler do_interrupt;
+	/** fast handler after autoactive */
+	intr_handler fast_handler;
+	/** slow handler */
+	intr_handler slow_handler;
 	/* verbs rx_stats per rcd */
 	struct hfi1_opcode_stats_perctx *opstats;
 	/* clear interrupt mask */
@@ -1616,6 +1622,39 @@  static inline u16 get_hdrq_cnt(struct hfi1_ctxtdata *rcd)
 	return rcd->rcvhdrq_cnt;
 }
 
+/**
+ * hfi1_is_slowpath - check if this context is slow path
+ * @rcd: the receive context
+ */
+static inline bool hfi1_is_slowpath(struct hfi1_ctxtdata *rcd)
+{
+	return rcd->do_interrupt == rcd->slow_handler;
+}
+
+/**
+ * hfi1_is_fastpath - check if this context is fast path
+ * @rcd: the receive context
+ */
+static inline bool hfi1_is_fastpath(struct hfi1_ctxtdata *rcd)
+{
+	if (rcd->ctxt == HFI1_CTRL_CTXT)
+		return false;
+
+	return rcd->do_interrupt == rcd->fast_handler;
+}
+
+/**
+ * hfi1_set_fast - change to the fast handler
+ * @rcd: the receive context
+ */
+static inline void hfi1_set_fast(struct hfi1_ctxtdata *rcd)
+{
+	if (unlikely(!rcd))
+		return;
+	if (unlikely(!hfi1_is_fastpath(rcd)))
+		rcd->do_interrupt = rcd->fast_handler;
+}
+
 int hfi1_reset_device(int);
 
 void receive_interrupt_work(struct work_struct *work);
diff --git a/drivers/infiniband/hw/hfi1/init.c b/drivers/infiniband/hw/hfi1/init.c
index 81c3551..925f75f9 100644
--- a/drivers/infiniband/hw/hfi1/init.c
+++ b/drivers/infiniband/hw/hfi1/init.c
@@ -150,6 +150,11 @@  static int hfi1_create_kctxt(struct hfi1_devdata *dd,
 	/* Control context must use DMA_RTAIL */
 	if (rcd->ctxt == HFI1_CTRL_CTXT)
 		rcd->flags |= HFI1_CAP_DMA_RTAIL;
+	rcd->fast_handler = get_dma_rtail_setting(rcd) ?
+				handle_receive_interrupt_dma_rtail :
+				handle_receive_interrupt_nodma_rtail;
+	rcd->slow_handler = handle_receive_interrupt;
+
 	hfi1_set_seq_cnt(rcd, 1);
 
 	rcd->sc = sc_alloc(dd, SC_ACK, rcd->rcvhdrqentsize, dd->node);
diff --git a/drivers/infiniband/hw/hfi1/trace_rx.h b/drivers/infiniband/hw/hfi1/trace_rx.h
index ebce81c..168079e 100644
--- a/drivers/infiniband/hw/hfi1/trace_rx.h
+++ b/drivers/infiniband/hw/hfi1/trace_rx.h
@@ -106,11 +106,7 @@ 
 			     ),
 	    TP_fast_assign(DD_DEV_ASSIGN(dd);
 			__entry->ctxt = rcd->ctxt;
-			if (rcd->do_interrupt ==
-			    &handle_receive_interrupt)
-				__entry->slow_path = 1;
-			else
-				__entry->slow_path = 0;
+			__entry->slow_path = hfi1_is_slowpath(rcd);
 			__entry->dma_rtail = get_dma_rtail_setting(rcd);
 			),
 	    TP_printk("[%s] ctxt %d SlowPath: %d DmaRtail: %d",