[PATCH net-next 1/7] gve: Switch to use napi_complete_done

* [PATCH net-next 1/7] gve: Switch to use napi_complete_done
@ 2021-10-07 16:25 Jeroen de Borst
  2021-10-07 16:25 ` [PATCH net-next 2/7] gve: Add rx buffer pagecnt bias Jeroen de Borst
                   ` (6 more replies)
  0 siblings, 7 replies; 10+ messages in thread
From: Jeroen de Borst @ 2021-10-07 16:25 UTC (permalink / raw)
  To: netdev; +Cc: davem, kuba, Yangchun Fu, Catherine Sullivan, David Awogbemila

From: Yangchun Fu <yangchun@google.com>

Use napi_complete_done to allow for the use of gro_flush_timeout.

Fixes: f5cedc84a30d2 ("gve: Add transmit and receive support")
Signed-off-by: Yangchun Fu <yangchun@google.com>
Signed-off-by: Catherine Sullivan <csully@google.com>
Signed-off-by: David Awogbemila <awogbemila@google.com>
---
 drivers/net/ethernet/google/gve/gve.h      |  5 ++-
 drivers/net/ethernet/google/gve/gve_main.c | 38 +++++++++++++---------
 drivers/net/ethernet/google/gve/gve_rx.c   | 37 +++++++++++----------
 3 files changed, 43 insertions(+), 37 deletions(-)

diff --git a/drivers/net/ethernet/google/gve/gve.h b/drivers/net/ethernet/google/gve/gve.h
index 85bf825606e8..59c525800e5d 100644
--- a/drivers/net/ethernet/google/gve/gve.h
+++ b/drivers/net/ethernet/google/gve/gve.h
@@ -825,11 +825,10 @@ __be32 gve_tx_load_event_counter(struct gve_priv *priv,
 				 struct gve_tx_ring *tx);
 /* rx handling */
 void gve_rx_write_doorbell(struct gve_priv *priv, struct gve_rx_ring *rx);
-bool gve_rx_poll(struct gve_notify_block *block, int budget);
+int gve_rx_poll(struct gve_notify_block *block, int budget);
+bool gve_rx_work_pending(struct gve_rx_ring *rx);
 int gve_rx_alloc_rings(struct gve_priv *priv);
 void gve_rx_free_rings_gqi(struct gve_priv *priv);
-bool gve_clean_rx_done(struct gve_rx_ring *rx, int budget,
-		       netdev_features_t feat);
 /* Reset */
 void gve_schedule_reset(struct gve_priv *priv);
 int gve_reset(struct gve_priv *priv, bool attempt_teardown);
diff --git a/drivers/net/ethernet/google/gve/gve_main.c b/drivers/net/ethernet/google/gve/gve_main.c
index cd9df68cc01e..388262c61b8d 100644
--- a/drivers/net/ethernet/google/gve/gve_main.c
+++ b/drivers/net/ethernet/google/gve/gve_main.c
@@ -181,34 +181,40 @@ static int gve_napi_poll(struct napi_struct *napi, int budget)
 	__be32 __iomem *irq_doorbell;
 	bool reschedule = false;
 	struct gve_priv *priv;
+	int work_done = 0;
 
 	block = container_of(napi, struct gve_notify_block, napi);
 	priv = block->priv;
 
 	if (block->tx)
 		reschedule |= gve_tx_poll(block, budget);
-	if (block->rx)
-		reschedule |= gve_rx_poll(block, budget);
+	if (block->rx) {
+		work_done = gve_rx_poll(block, budget);
+		reschedule |= work_done == budget;
+	}
 
 	if (reschedule)
 		return budget;
 
-	napi_complete(napi);
-	irq_doorbell = gve_irq_doorbell(priv, block);
-	iowrite32be(GVE_IRQ_ACK | GVE_IRQ_EVENT, irq_doorbell);
+       /* Complete processing - don't unmask irq if busy polling is enabled */
+	if (likely(napi_complete_done(napi, work_done))) {
+		irq_doorbell = gve_irq_doorbell(priv, block);
+		iowrite32be(GVE_IRQ_ACK | GVE_IRQ_EVENT, irq_doorbell);
 
-	/* Double check we have no extra work.
-	 * Ensure unmask synchronizes with checking for work.
-	 */
-	mb();
-	if (block->tx)
-		reschedule |= gve_tx_poll(block, -1);
-	if (block->rx)
-		reschedule |= gve_rx_poll(block, -1);
-	if (reschedule && napi_reschedule(napi))
-		iowrite32be(GVE_IRQ_MASK, irq_doorbell);
+		/* Double check we have no extra work.
+		 * Ensure unmask synchronizes with checking for work.
+		 */
+		mb();
 
-	return 0;
+		if (block->tx)
+			reschedule |= gve_tx_poll(block, -1);
+		if (block->rx)
+			reschedule |= gve_rx_work_pending(block->rx);
+
+		if (reschedule && napi_reschedule(napi))
+			iowrite32be(GVE_IRQ_MASK, irq_doorbell);
+	}
+	return work_done;
 }
 
 static int gve_napi_poll_dqo(struct napi_struct *napi, int budget)
diff --git a/drivers/net/ethernet/google/gve/gve_rx.c b/drivers/net/ethernet/google/gve/gve_rx.c
index bb8261368250..bb9fc456416b 100644
--- a/drivers/net/ethernet/google/gve/gve_rx.c
+++ b/drivers/net/ethernet/google/gve/gve_rx.c
@@ -450,7 +450,7 @@ static bool gve_rx(struct gve_rx_ring *rx, struct gve_rx_desc *rx_desc,
 	return true;
 }
 
-static bool gve_rx_work_pending(struct gve_rx_ring *rx)
+bool gve_rx_work_pending(struct gve_rx_ring *rx)
 {
 	struct gve_rx_desc *desc;
 	__be16 flags_seq;
@@ -518,8 +518,8 @@ static bool gve_rx_refill_buffers(struct gve_priv *priv, struct gve_rx_ring *rx)
 	return true;
 }
 
-bool gve_clean_rx_done(struct gve_rx_ring *rx, int budget,
-		       netdev_features_t feat)
+int gve_clean_rx_done(struct gve_rx_ring *rx, int budget,
+		      netdev_features_t feat)
 {
 	struct gve_priv *priv = rx->gve;
 	u32 work_done = 0, packets = 0;
@@ -553,13 +553,15 @@ bool gve_clean_rx_done(struct gve_rx_ring *rx, int budget,
 	}
 
 	if (!work_done && rx->fill_cnt - cnt > rx->db_threshold)
-		return false;
+		return 0;
 
-	u64_stats_update_begin(&rx->statss);
-	rx->rpackets += packets;
-	rx->rbytes += bytes;
-	u64_stats_update_end(&rx->statss);
-	rx->cnt = cnt;
+	if (work_done) {
+		u64_stats_update_begin(&rx->statss);
+		rx->rpackets += packets;
+		rx->rbytes += bytes;
+		u64_stats_update_end(&rx->statss);
+		rx->cnt = cnt;
+	}
 
 	/* restock ring slots */
 	if (!rx->data.raw_addressing) {
@@ -570,26 +572,26 @@ bool gve_clean_rx_done(struct gve_rx_ring *rx, int budget,
 		 * falls below a threshold.
 		 */
 		if (!gve_rx_refill_buffers(priv, rx))
-			return false;
+			return 0;
 
 		/* If we were not able to completely refill buffers, we'll want
 		 * to schedule this queue for work again to refill buffers.
 		 */
 		if (rx->fill_cnt - cnt <= rx->db_threshold) {
 			gve_rx_write_doorbell(priv, rx);
-			return true;
+			return budget;
 		}
 	}
 
 	gve_rx_write_doorbell(priv, rx);
-	return gve_rx_work_pending(rx);
+	return work_done;
 }
 
-bool gve_rx_poll(struct gve_notify_block *block, int budget)
+int gve_rx_poll(struct gve_notify_block *block, int budget)
 {
 	struct gve_rx_ring *rx = block->rx;
 	netdev_features_t feat;
-	bool repoll = false;
+	int work_done = 0;
 
 	feat = block->napi.dev->features;
 
@@ -598,8 +600,7 @@ bool gve_rx_poll(struct gve_notify_block *block, int budget)
 		budget = INT_MAX;
 
 	if (budget > 0)
-		repoll |= gve_clean_rx_done(rx, budget, feat);
-	else
-		repoll |= gve_rx_work_pending(rx);
-	return repoll;
+		work_done = gve_clean_rx_done(rx, budget, feat);
+
+	return work_done;
 }
-- 
2.33.0.800.g4c38ced690-goog


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