[Intel-wired-lan] [next-queue v2 2/4] i40e: Record number TXes cleaned during NAPI

[Joe Damato <jdamato@fastly.com>]

Update i40e_clean_tx_irq to take an out parameter (tx_cleaned) which stores
the number TXs cleaned.

Likewise, update i40e_clean_xdp_tx_irq and i40e_xmit_zc to do the same.

Care has been taken to avoid changing the control flow of any functions
involved.

Signed-off-by: Joe Damato <jdamato@fastly.com>
---
 drivers/net/ethernet/intel/i40e/i40e_txrx.c | 16 +++++++++++-----
 drivers/net/ethernet/intel/i40e/i40e_xsk.c  | 15 +++++++++++----
 drivers/net/ethernet/intel/i40e/i40e_xsk.h  |  3 ++-
 3 files changed, 24 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index b97c95f..a2cc98e 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -923,11 +923,13 @@ void i40e_detect_recover_hung(struct i40e_vsi *vsi)
  * @vsi: the VSI we care about
  * @tx_ring: Tx ring to clean
  * @napi_budget: Used to determine if we are in netpoll
+ * @tx_cleaned: Out parameter set to the number of TXes cleaned
  *
  * Returns true if there's any budget left (e.g. the clean is finished)
  **/
 static bool i40e_clean_tx_irq(struct i40e_vsi *vsi,
-			      struct i40e_ring *tx_ring, int napi_budget)
+			      struct i40e_ring *tx_ring, int napi_budget,
+			      unsigned int *tx_cleaned)
 {
 	int i = tx_ring->next_to_clean;
 	struct i40e_tx_buffer *tx_buf;
@@ -1026,7 +1028,7 @@ static bool i40e_clean_tx_irq(struct i40e_vsi *vsi,
 	i40e_arm_wb(tx_ring, vsi, budget);
 
 	if (ring_is_xdp(tx_ring))
-		return !!budget;
+		goto out;
 
 	/* notify netdev of completed buffers */
 	netdev_tx_completed_queue(txring_txq(tx_ring),
@@ -1048,6 +1050,8 @@ static bool i40e_clean_tx_irq(struct i40e_vsi *vsi,
 		}
 	}
 
+out:
+	*tx_cleaned = total_packets;
 	return !!budget;
 }
 
@@ -2689,10 +2693,12 @@ int i40e_napi_poll(struct napi_struct *napi, int budget)
 			       container_of(napi, struct i40e_q_vector, napi);
 	struct i40e_vsi *vsi = q_vector->vsi;
 	struct i40e_ring *ring;
+	bool tx_clean_complete = true;
 	bool clean_complete = true;
 	bool arm_wb = false;
 	int budget_per_ring;
 	int work_done = 0;
+	unsigned int tx_cleaned = 0;
 
 	if (test_bit(__I40E_VSI_DOWN, vsi->state)) {
 		napi_complete(napi);
@@ -2704,11 +2710,11 @@ int i40e_napi_poll(struct napi_struct *napi, int budget)
 	 */
 	i40e_for_each_ring(ring, q_vector->tx) {
 		bool wd = ring->xsk_pool ?
-			  i40e_clean_xdp_tx_irq(vsi, ring) :
-			  i40e_clean_tx_irq(vsi, ring, budget);
+			  i40e_clean_xdp_tx_irq(vsi, ring, &tx_cleaned) :
+			  i40e_clean_tx_irq(vsi, ring, budget, &tx_cleaned);
 
 		if (!wd) {
-			clean_complete = false;
+			clean_complete = tx_clean_complete = false;
 			continue;
 		}
 		arm_wb |= ring->arm_wb;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
index 790aaeff..f98ce7e4 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
@@ -530,18 +530,22 @@ static void i40e_set_rs_bit(struct i40e_ring *xdp_ring)
  * i40e_xmit_zc - Performs zero-copy Tx AF_XDP
  * @xdp_ring: XDP Tx ring
  * @budget: NAPI budget
+ * @tx_cleaned: Out parameter of the TX packets processed
  *
  * Returns true if the work is finished.
  **/
-static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget)
+static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget,
+			 unsigned int *tx_cleaned)
 {
 	struct xdp_desc *descs = xdp_ring->xsk_pool->tx_descs;
 	u32 nb_pkts, nb_processed = 0;
 	unsigned int total_bytes = 0;
 
 	nb_pkts = xsk_tx_peek_release_desc_batch(xdp_ring->xsk_pool, budget);
-	if (!nb_pkts)
+	if (!nb_pkts) {
+		*tx_cleaned = 0;
 		return true;
+	}
 
 	if (xdp_ring->next_to_use + nb_pkts >= xdp_ring->count) {
 		nb_processed = xdp_ring->count - xdp_ring->next_to_use;
@@ -558,6 +562,7 @@ static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget)
 
 	i40e_update_tx_stats(xdp_ring, nb_pkts, total_bytes);
 
+	*tx_cleaned = nb_pkts;
 	return nb_pkts < budget;
 }
 
@@ -581,10 +586,12 @@ static void i40e_clean_xdp_tx_buffer(struct i40e_ring *tx_ring,
  * i40e_clean_xdp_tx_irq - Completes AF_XDP entries, and cleans XDP entries
  * @vsi: Current VSI
  * @tx_ring: XDP Tx ring
+ * @tx_cleaned: out parameter of number of TXes cleaned
  *
  * Returns true if cleanup/tranmission is done.
  **/
-bool i40e_clean_xdp_tx_irq(struct i40e_vsi *vsi, struct i40e_ring *tx_ring)
+bool i40e_clean_xdp_tx_irq(struct i40e_vsi *vsi, struct i40e_ring *tx_ring,
+			   unsigned int *tx_cleaned)
 {
 	struct xsk_buff_pool *bp = tx_ring->xsk_pool;
 	u32 i, completed_frames, xsk_frames = 0;
@@ -634,7 +641,7 @@ bool i40e_clean_xdp_tx_irq(struct i40e_vsi *vsi, struct i40e_ring *tx_ring)
 	if (xsk_uses_need_wakeup(tx_ring->xsk_pool))
 		xsk_set_tx_need_wakeup(tx_ring->xsk_pool);
 
-	return i40e_xmit_zc(tx_ring, I40E_DESC_UNUSED(tx_ring));
+	return i40e_xmit_zc(tx_ring, I40E_DESC_UNUSED(tx_ring), tx_cleaned);
 }
 
 /**
diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.h b/drivers/net/ethernet/intel/i40e/i40e_xsk.h
index 821df24..396ed11 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_xsk.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.h
@@ -30,7 +30,8 @@ int i40e_xsk_pool_setup(struct i40e_vsi *vsi, struct xsk_buff_pool *pool,
 bool i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 cleaned_count);
 int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget);
 
-bool i40e_clean_xdp_tx_irq(struct i40e_vsi *vsi, struct i40e_ring *tx_ring);
+bool i40e_clean_xdp_tx_irq(struct i40e_vsi *vsi, struct i40e_ring *tx_ring,
+			   unsigned int *tx_cleaned);
 int i40e_xsk_wakeup(struct net_device *dev, u32 queue_id, u32 flags);
 int i40e_realloc_rx_bi_zc(struct i40e_vsi *vsi, bool zc);
 void i40e_clear_rx_bi_zc(struct i40e_ring *rx_ring);
-- 
2.7.4

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