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From: Grygorii Strashko <grygorii.strashko@ti.com>
To: "David S . Miller" <davem@davemloft.net>,
	Richard Cochran <richardcochran@gmail.com>,
	Lokesh Vutla <lokeshvutla@ti.com>,
	Tony Lindgren <tony@atomide.com>
Cc: Sekhar Nori <nsekhar@ti.com>,
	Murali Karicheri <m-karicheri2@ti.com>,
	netdev <netdev@vger.kernel.org>, <linux-omap@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>,
	Grygorii Strashko <grygorii.strashko@ti.com>
Subject: [PATCH net-next v3 08/11] net: ethernet: ti: cpts: move rx timestamp processing to ptp worker only
Date: Fri, 20 Mar 2020 21:42:41 +0200	[thread overview]
Message-ID: <20200320194244.4703-9-grygorii.strashko@ti.com> (raw)
In-Reply-To: <20200320194244.4703-1-grygorii.strashko@ti.com>

Once CPTS IRQ will be enabled the CPTS irq handler may compete with netif
RX sofirq path and so RX timestamp might not be ready at the moment packet
is processed. As result, packet has to be deferred and processed later.

This patch moves RX timestamp processing tx timestamp processing to PTP
worker always the same way as it's been done for TX timestamps.

  napi_rx->cpts_rx_timestamp
   if ptp_packet then
      push to rxq
      ptp_schedule_worker()

  do_aux_work->cpts_overflow_check
    cpts_process_events()

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
---
 drivers/net/ethernet/ti/cpsw.c     |  14 +--
 drivers/net/ethernet/ti/cpsw_new.c |  13 ++-
 drivers/net/ethernet/ti/cpts.c     | 132 ++++++++++++++++++-----------
 drivers/net/ethernet/ti/cpts.h     |   6 +-
 4 files changed, 106 insertions(+), 59 deletions(-)

diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index c2c5bf87da01..ce2155394830 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -433,17 +433,21 @@ static void cpsw_rx_handler(void *token, int len, int status)
 	skb->dev = ndev;
 	if (status & CPDMA_RX_VLAN_ENCAP)
 		cpsw_rx_vlan_encap(skb);
-	if (priv->rx_ts_enabled)
-		cpts_rx_timestamp(cpsw->cpts, skb);
-	skb->protocol = eth_type_trans(skb, ndev);
 
 	/* unmap page as no netstack skb page recycling */
 	page_pool_release_page(pool, page);
-	netif_receive_skb(skb);
-
 	ndev->stats.rx_bytes += len;
 	ndev->stats.rx_packets++;
 
+	ret = 0;
+	if (priv->rx_ts_enabled)
+		ret = cpts_rx_timestamp(cpsw->cpts, skb);
+
+	if (!ret) {
+		skb->protocol = eth_type_trans(skb, ndev);
+		netif_receive_skb(skb);
+	}
+
 requeue:
 	xmeta = page_address(new_page) + CPSW_XMETA_OFFSET;
 	xmeta->ndev = ndev;
diff --git a/drivers/net/ethernet/ti/cpsw_new.c b/drivers/net/ethernet/ti/cpsw_new.c
index 9209e613257d..8561f0e3b769 100644
--- a/drivers/net/ethernet/ti/cpsw_new.c
+++ b/drivers/net/ethernet/ti/cpsw_new.c
@@ -375,17 +375,22 @@ static void cpsw_rx_handler(void *token, int len, int status)
 	skb->dev = ndev;
 	if (status & CPDMA_RX_VLAN_ENCAP)
 		cpsw_rx_vlan_encap(skb);
-	if (priv->rx_ts_enabled)
-		cpts_rx_timestamp(cpsw->cpts, skb);
-	skb->protocol = eth_type_trans(skb, ndev);
 
 	/* unmap page as no netstack skb page recycling */
 	page_pool_release_page(pool, page);
-	netif_receive_skb(skb);
 
 	ndev->stats.rx_bytes += len;
 	ndev->stats.rx_packets++;
 
+	ret = 0;
+	if (priv->rx_ts_enabled)
+		ret = cpts_rx_timestamp(cpsw->cpts, skb);
+
+	if (!ret) {
+		skb->protocol = eth_type_trans(skb, ndev);
+		netif_receive_skb(skb);
+	}
+
 requeue:
 	xmeta = page_address(new_page) + CPSW_XMETA_OFFSET;
 	xmeta->ndev = ndev;
diff --git a/drivers/net/ethernet/ti/cpts.c b/drivers/net/ethernet/ti/cpts.c
index 3cfa0f78287b..fe70eb677b88 100644
--- a/drivers/net/ethernet/ti/cpts.c
+++ b/drivers/net/ethernet/ti/cpts.c
@@ -311,6 +311,66 @@ static bool cpts_match_tx_ts(struct cpts *cpts, struct cpts_event *event)
 	return found;
 }
 
+static bool cpts_match_rx_ts(struct cpts *cpts, struct cpts_event *event)
+{
+	struct sk_buff_head rxq_list;
+	struct sk_buff_head tempq;
+	struct sk_buff *skb, *tmp;
+	unsigned long flags;
+	bool found = false;
+	u32 mtype_seqid;
+
+	mtype_seqid = event->high &
+		      ((MESSAGE_TYPE_MASK << MESSAGE_TYPE_SHIFT) |
+		       (SEQUENCE_ID_MASK << SEQUENCE_ID_SHIFT) |
+		       (EVENT_TYPE_MASK << EVENT_TYPE_SHIFT));
+
+	__skb_queue_head_init(&rxq_list);
+	__skb_queue_head_init(&tempq);
+
+	spin_lock_irqsave(&cpts->rxq.lock, flags);
+	skb_queue_splice_init(&cpts->rxq, &rxq_list);
+	spin_unlock_irqrestore(&cpts->rxq.lock, flags);
+
+	skb_queue_walk_safe(&rxq_list, skb, tmp) {
+		struct skb_shared_hwtstamps *ssh;
+		struct cpts_skb_cb_data *skb_cb =
+					(struct cpts_skb_cb_data *)skb->cb;
+
+		if (mtype_seqid == skb_cb->skb_mtype_seqid) {
+			__skb_unlink(skb, &rxq_list);
+			ssh = skb_hwtstamps(skb);
+			memset(ssh, 0, sizeof(*ssh));
+			ssh->hwtstamp = ns_to_ktime(event->timestamp);
+			found = true;
+			dev_dbg(cpts->dev, "match rx timestamp mtype_seqid %08x\n",
+				mtype_seqid);
+			__skb_queue_tail(&tempq, skb);
+			break;
+		}
+
+		if (time_after(jiffies, skb_cb->tmo)) {
+			/* timeout any expired skbs */
+			dev_dbg(cpts->dev, "expiring rx timestamp\n");
+			__skb_unlink(skb, &rxq_list);
+			__skb_queue_tail(&tempq, skb);
+		}
+	}
+
+	spin_lock_irqsave(&cpts->rxq.lock, flags);
+	skb_queue_splice(&rxq_list, &cpts->rxq);
+	spin_unlock_irqrestore(&cpts->rxq.lock, flags);
+
+	local_bh_disable();
+	while ((skb = __skb_dequeue(&tempq))) {
+		skb->protocol = eth_type_trans(skb, skb->dev);
+		netif_receive_skb(skb);
+	}
+	local_bh_enable();
+
+	return found;
+}
+
 static void cpts_process_events(struct cpts *cpts)
 {
 	struct list_head *this, *next;
@@ -318,6 +378,7 @@ static void cpts_process_events(struct cpts *cpts)
 	LIST_HEAD(events_free);
 	unsigned long flags;
 	LIST_HEAD(events);
+	int type;
 
 	spin_lock_irqsave(&cpts->lock, flags);
 	list_splice_init(&cpts->events, &events);
@@ -325,8 +386,18 @@ static void cpts_process_events(struct cpts *cpts)
 
 	list_for_each_safe(this, next, &events) {
 		event = list_entry(this, struct cpts_event, list);
-		if (cpts_match_tx_ts(cpts, event) ||
-		    time_after(jiffies, event->tmo)) {
+		type = event_type(event);
+
+		if (type == CPTS_EV_TX &&
+		    (cpts_match_tx_ts(cpts, event) ||
+		     time_after(jiffies, event->tmo))) {
+			list_del_init(&event->list);
+			list_add(&event->list, &events_free);
+		}
+
+		if (type == CPTS_EV_RX &&
+		    (cpts_match_rx_ts(cpts, event) ||
+		     time_after(jiffies, event->tmo))) {
 			list_del_init(&event->list);
 			list_add(&event->list, &events_free);
 		}
@@ -422,64 +493,27 @@ static int cpts_skb_get_mtype_seqid(struct sk_buff *skb, u32 *mtype_seqid)
 	return 1;
 }
 
-static u64 cpts_find_ts(struct cpts *cpts, struct sk_buff *skb,
-			int ev_type, u32 skb_mtype_seqid)
-{
-	struct list_head *this, *next;
-	struct cpts_event *event;
-	unsigned long flags;
-	u32 mtype_seqid;
-	u64 ns = 0;
-
-	cpts_fifo_read(cpts, -1);
-	spin_lock_irqsave(&cpts->lock, flags);
-	list_for_each_safe(this, next, &cpts->events) {
-		event = list_entry(this, struct cpts_event, list);
-		if (event_expired(event)) {
-			list_del_init(&event->list);
-			list_add(&event->list, &cpts->pool);
-			continue;
-		}
-
-		mtype_seqid = event->high &
-			      ((MESSAGE_TYPE_MASK << MESSAGE_TYPE_SHIFT) |
-			       (SEQUENCE_ID_MASK << SEQUENCE_ID_SHIFT) |
-			       (EVENT_TYPE_MASK << EVENT_TYPE_SHIFT));
-
-		if (mtype_seqid == skb_mtype_seqid) {
-			ns = event->timestamp;
-			list_del_init(&event->list);
-			list_add(&event->list, &cpts->pool);
-			break;
-		}
-	}
-	spin_unlock_irqrestore(&cpts->lock, flags);
-
-	return ns;
-}
-
-void cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb)
+int cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb)
 {
 	struct cpts_skb_cb_data *skb_cb = (struct cpts_skb_cb_data *)skb->cb;
-	struct skb_shared_hwtstamps *ssh;
 	int ret;
-	u64 ns;
 
 	ret = cpts_skb_get_mtype_seqid(skb, &skb_cb->skb_mtype_seqid);
 	if (!ret)
-		return;
+		return 0;
 
 	skb_cb->skb_mtype_seqid |= (CPTS_EV_RX << EVENT_TYPE_SHIFT);
 
 	dev_dbg(cpts->dev, "%s mtype seqid %08x\n",
 		__func__, skb_cb->skb_mtype_seqid);
 
-	ns = cpts_find_ts(cpts, skb, CPTS_EV_RX, skb_cb->skb_mtype_seqid);
-	if (!ns)
-		return;
-	ssh = skb_hwtstamps(skb);
-	memset(ssh, 0, sizeof(*ssh));
-	ssh->hwtstamp = ns_to_ktime(ns);
+	/* Always defer RX TS processing to PTP worker */
+	/* get the timestamp for timeouts */
+	skb_cb->tmo = jiffies + msecs_to_jiffies(CPTS_SKB_RX_TX_TMO);
+	skb_queue_tail(&cpts->rxq, skb);
+	ptp_schedule_worker(cpts->clock, 0);
+
+	return 1;
 }
 EXPORT_SYMBOL_GPL(cpts_rx_timestamp);
 
@@ -514,6 +548,7 @@ int cpts_register(struct cpts *cpts)
 	int err, i;
 
 	skb_queue_head_init(&cpts->txq);
+	skb_queue_head_init(&cpts->rxq);
 	INIT_LIST_HEAD(&cpts->events);
 	INIT_LIST_HEAD(&cpts->pool);
 	for (i = 0; i < CPTS_MAX_EVENTS; i++)
@@ -556,6 +591,7 @@ void cpts_unregister(struct cpts *cpts)
 
 	/* Drop all packet */
 	skb_queue_purge(&cpts->txq);
+	skb_queue_purge(&cpts->rxq);
 
 	clk_disable(cpts->refclk);
 }
diff --git a/drivers/net/ethernet/ti/cpts.h b/drivers/net/ethernet/ti/cpts.h
index f16e14d67f5f..d6069198e059 100644
--- a/drivers/net/ethernet/ti/cpts.h
+++ b/drivers/net/ethernet/ti/cpts.h
@@ -115,12 +115,13 @@ struct cpts {
 	struct cpts_event pool_data[CPTS_MAX_EVENTS];
 	unsigned long ov_check_period;
 	struct sk_buff_head txq;
+	struct sk_buff_head rxq;
 	u64 cur_timestamp;
 	u32 mult_new;
 	struct mutex ptp_clk_mutex; /* sync PTP interface and worker */
 };
 
-void cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb);
+int cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb);
 void cpts_tx_timestamp(struct cpts *cpts, struct sk_buff *skb);
 int cpts_register(struct cpts *cpts);
 void cpts_unregister(struct cpts *cpts);
@@ -141,8 +142,9 @@ static inline bool cpts_can_timestamp(struct cpts *cpts, struct sk_buff *skb)
 #else
 struct cpts;
 
-static inline void cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb)
+static inline int cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb)
 {
+	return 0;
 }
 static inline void cpts_tx_timestamp(struct cpts *cpts, struct sk_buff *skb)
 {
-- 
2.17.1


  parent reply	other threads:[~2020-03-20 19:43 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-20 19:42 [PATCH net-next v3 00/11] net: ethernet: ti: cpts: add irq and HW_TS_PUSH events Grygorii Strashko
2020-03-20 19:42 ` [PATCH net-next v3 01/11] net: ethernet: ti: cpts: use dev_yy() api for logs Grygorii Strashko
2020-03-26 14:03   ` Richard Cochran
2020-03-20 19:42 ` [PATCH net-next v3 02/11] net: ethernet: ti: cpts: separate hw counter read from timecounter Grygorii Strashko
2020-03-26 14:18   ` Richard Cochran
2020-03-26 20:14     ` Grygorii Strashko
2020-03-20 19:42 ` [PATCH net-next v3 03/11] net: ethernet: ti: cpts: move tc mult update in cpts_fifo_read() Grygorii Strashko
2020-03-26 14:20   ` Richard Cochran
2020-03-26 20:18     ` Grygorii Strashko
2020-03-27  1:26       ` Richard Cochran
2020-03-20 19:42 ` [PATCH net-next v3 04/11] net: ethernet: ti: cpts: switch to use new .gettimex64() interface Grygorii Strashko
2020-03-20 19:42 ` [PATCH net-next v3 05/11] net: ethernet: ti: cpts: optimize packet to event matching Grygorii Strashko
2020-03-20 19:42 ` [PATCH net-next v3 06/11] net: ethernet: ti: cpts: move tx timestamp processing to ptp worker only Grygorii Strashko
2020-03-26 14:29   ` Richard Cochran
2020-03-26 20:17     ` Grygorii Strashko
2020-03-20 19:42 ` [PATCH net-next v3 07/11] net: ethernet: ti: cpts: rework locking Grygorii Strashko
2020-03-27  1:28   ` Richard Cochran
2020-03-20 19:42 ` Grygorii Strashko [this message]
2020-03-24 13:43   ` [PATCH net-next v3 08/11] net: ethernet: ti: cpts: move rx timestamp processing to ptp worker only Richard Cochran
2020-03-24 15:34     ` Grygorii Strashko
2020-03-24 16:54       ` Richard Cochran
2020-03-26 11:15         ` Grygorii Strashko
2020-03-27  1:37           ` Richard Cochran
2020-03-20 19:42 ` [PATCH net-next v3 09/11] net: ethernet: ti: cpts: add irq support Grygorii Strashko
2020-03-20 19:42 ` [PATCH net-next v3 10/11] net: ethernet: ti: cpts: add support for HW_TS_PUSH events Grygorii Strashko
2020-03-27  1:34   ` Richard Cochran
2020-03-20 19:42 ` [PATCH net-next v3 11/11] net: ethernet: ti: cpsw: enable cpts irq Grygorii Strashko
2020-03-24  4:17 ` [PATCH net-next v3 00/11] net: ethernet: ti: cpts: add irq and HW_TS_PUSH events David Miller
2020-03-24 13:38 ` Richard Cochran

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