linux-kernel - [PATCH v2 2/2] net: thunderx: Support for byte queue limits

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Message-Id: <1474621948-9172-3-git-send-email-sunil.kovvuri@gmail.com>
Date:   Fri, 23 Sep 2016 14:42:28 +0530
From:   sunil.kovvuri@...il.com
To:     netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Sunil Goutham <sgoutham@...ium.com>
Subject: [PATCH v2 2/2] net: thunderx: Support for byte queue limits

From: Sunil Goutham <sgoutham@...ium.com>

This patch adds support for byte queue limits

Signed-off-by: Sunil Goutham <sgoutham@...ium.com>
---
 drivers/net/ethernet/cavium/thunder/nicvf_main.c   | 14 ++++++++--
 drivers/net/ethernet/cavium/thunder/nicvf_queues.c | 30 ++++++++++++++--------
 2 files changed, 32 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_main.c b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
index 7d00162..45a13f7 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_main.c
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
@@ -516,7 +516,8 @@ static int nicvf_init_resources(struct nicvf *nic)
 static void nicvf_snd_pkt_handler(struct net_device *netdev,
 				  struct cmp_queue *cq,
 				  struct cqe_send_t *cqe_tx,
-				  int cqe_type, int budget)
+				  int cqe_type, int budget,
+				  unsigned int *tx_pkts, unsigned int *tx_bytes)
 {
 	struct sk_buff *skb = NULL;
 	struct nicvf *nic = netdev_priv(netdev);
@@ -547,6 +548,8 @@ static void nicvf_snd_pkt_handler(struct net_device *netdev,
 		}
 		nicvf_put_sq_desc(sq, hdr->subdesc_cnt + 1);
 		prefetch(skb);
+		(*tx_pkts)++;
+		*tx_bytes += skb->len;
 		napi_consume_skb(skb, budget);
 		sq->skbuff[cqe_tx->sqe_ptr] = (u64)NULL;
 	} else {
@@ -662,6 +665,7 @@ static int nicvf_cq_intr_handler(struct net_device *netdev, u8 cq_idx,
 	struct cmp_queue *cq = &qs->cq[cq_idx];
 	struct cqe_rx_t *cq_desc;
 	struct netdev_queue *txq;
+	unsigned int tx_pkts = 0, tx_bytes = 0;
 
 	spin_lock_bh(&cq->lock);
 loop:
@@ -701,7 +705,7 @@ loop:
 		case CQE_TYPE_SEND:
 			nicvf_snd_pkt_handler(netdev, cq,
 					      (void *)cq_desc, CQE_TYPE_SEND,
-					      budget);
+					      budget, &tx_pkts, &tx_bytes);
 			tx_done++;
 		break;
 		case CQE_TYPE_INVALID:
@@ -730,6 +734,9 @@ done:
 		netdev = nic->pnicvf->netdev;
 		txq = netdev_get_tx_queue(netdev,
 					  nicvf_netdev_qidx(nic, cq_idx));
+		if (tx_pkts)
+			netdev_tx_completed_queue(txq, tx_pkts, tx_bytes);
+
 		nic = nic->pnicvf;
 		if (netif_tx_queue_stopped(txq) && netif_carrier_ok(netdev)) {
 			netif_tx_start_queue(txq);
@@ -1160,6 +1167,9 @@ int nicvf_stop(struct net_device *netdev)
 
 	netif_tx_disable(netdev);
 
+	for (qidx = 0; qidx < netdev->num_tx_queues; qidx++)
+		netdev_tx_reset_queue(netdev_get_tx_queue(netdev, qidx));
+
 	/* Free resources */
 	nicvf_config_data_transfer(nic, false);
 
diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
index 178c5c7..a4fc501 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
@@ -1082,6 +1082,24 @@ static inline void nicvf_sq_add_cqe_subdesc(struct snd_queue *sq, int qentry,
 	imm->len = 1;
 }
 
+static inline void nicvf_sq_doorbell(struct nicvf *nic, struct sk_buff *skb,
+				     int sq_num, int desc_cnt)
+{
+	struct netdev_queue *txq;
+
+	txq = netdev_get_tx_queue(nic->pnicvf->netdev,
+				  skb_get_queue_mapping(skb));
+
+	netdev_tx_sent_queue(txq, skb->len);
+
+	/* make sure all memory stores are done before ringing doorbell */
+	smp_wmb();
+
+	/* Inform HW to xmit all TSO segments */
+	nicvf_queue_reg_write(nic, NIC_QSET_SQ_0_7_DOOR,
+			      sq_num, desc_cnt);
+}
+
 /* Segment a TSO packet into 'gso_size' segments and append
  * them to SQ for transfer
  */
@@ -1141,12 +1159,8 @@ static int nicvf_sq_append_tso(struct nicvf *nic, struct snd_queue *sq,
 	/* Save SKB in the last segment for freeing */
 	sq->skbuff[hdr_qentry] = (u64)skb;
 
-	/* make sure all memory stores are done before ringing doorbell */
-	smp_wmb();
+	nicvf_sq_doorbell(nic, skb, sq_num, desc_cnt);
 
-	/* Inform HW to xmit all TSO segments */
-	nicvf_queue_reg_write(nic, NIC_QSET_SQ_0_7_DOOR,
-			      sq_num, desc_cnt);
 	nic->drv_stats.tx_tso++;
 	return 1;
 }
@@ -1219,12 +1233,8 @@ doorbell:
 		nicvf_sq_add_cqe_subdesc(sq, qentry, tso_sqe, skb);
 	}
 
-	/* make sure all memory stores are done before ringing doorbell */
-	smp_wmb();
+	nicvf_sq_doorbell(nic, skb, sq_num, subdesc_cnt);
 
-	/* Inform HW to xmit new packet */
-	nicvf_queue_reg_write(nic, NIC_QSET_SQ_0_7_DOOR,
-			      sq_num, subdesc_cnt);
 	return 1;
 
 append_fail:
-- 
2.7.4