netdev - [PATCH net-next v2 4/7] bnxt_en: Get the full 48-bit hardware timestamp periodically

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Date:   Sun, 27 Jun 2021 13:19:47 -0400
From:   Michael Chan <michael.chan@...adcom.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, kuba@...nel.org, gospo@...adcom.com,
        richardcochran@...il.com, pavan.chebbi@...adcom.com,
        edwin.peer@...adcom.com
Subject: [PATCH net-next v2 4/7] bnxt_en: Get the full 48-bit hardware timestamp periodically

From: Pavan Chebbi <pavan.chebbi@...adcom.com>

>From the bnxt_timer(), read the 48-bit hardware running clock
periodically and store it in ptp->current_time.  The previous snapshot
of the clock will be stored in ptp->old_time.  The old_time snapshot
will be used in the next patches to compute the RX packet timestamps.

v2: Use .do_aux_work() to read the timer periodically.

Reviewed-by: Edwin Peer <edwin.peer@...adcom.com>
Signed-off-by: Pavan Chebbi <pavan.chebbi@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c     |  1 +
 drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c | 39 +++++++++++++++++++
 drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h |  1 +
 3 files changed, 41 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 1250a5b50b50..23eddde7bf12 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -10075,6 +10075,7 @@ static int __bnxt_open_nic(struct bnxt *bp, bool irq_re_init, bool link_re_init)
 		}
 	}
 
+	bnxt_ptp_start(bp);
 	rc = bnxt_init_nic(bp, irq_re_init);
 	if (rc) {
 		netdev_err(bp->dev, "bnxt_init_nic err: %x\n", rc);
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
index 47f1f9c3380c..b0563c7761ff 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
@@ -45,6 +45,18 @@ static u64 bnxt_refclk_read(struct bnxt *bp, struct ptp_system_timestamp *sts)
 	return ns;
 }
 
+static void bnxt_ptp_get_current_time(struct bnxt *bp)
+{
+	struct bnxt_ptp_cfg *ptp = bp->ptp_cfg;
+
+	if (!ptp)
+		return;
+	spin_lock_bh(&ptp->ptp_lock);
+	WRITE_ONCE(ptp->old_time, ptp->current_time);
+	ptp->current_time = bnxt_refclk_read(bp, NULL);
+	spin_unlock_bh(&ptp->ptp_lock);
+}
+
 static int bnxt_ptp_gettimex(struct ptp_clock_info *ptp_info,
 			     struct timespec64 *ts,
 			     struct ptp_system_timestamp *sts)
@@ -257,6 +269,32 @@ static u64 bnxt_cc_read(const struct cyclecounter *cc)
 	return bnxt_refclk_read(ptp->bp, NULL);
 }
 
+static long bnxt_ptp_ts_aux_work(struct ptp_clock_info *ptp_info)
+{
+	struct bnxt_ptp_cfg *ptp = container_of(ptp_info, struct bnxt_ptp_cfg,
+						ptp_info);
+	struct bnxt *bp = ptp->bp;
+
+	bnxt_ptp_get_current_time(bp);
+	return HZ;
+}
+
+void bnxt_ptp_start(struct bnxt *bp)
+{
+	struct bnxt_ptp_cfg *ptp = bp->ptp_cfg;
+
+	if (!ptp)
+		return;
+
+	if (bp->flags & BNXT_FLAG_CHIP_P5) {
+		spin_lock_bh(&ptp->ptp_lock);
+		ptp->current_time = bnxt_refclk_read(bp, NULL);
+		WRITE_ONCE(ptp->old_time, ptp->current_time);
+		spin_unlock_bh(&ptp->ptp_lock);
+		ptp_schedule_worker(ptp->ptp_clock, 0);
+	}
+}
+
 static const struct ptp_clock_info bnxt_ptp_caps = {
 	.owner		= THIS_MODULE,
 	.name		= "bnxt clock",
@@ -268,6 +306,7 @@ static const struct ptp_clock_info bnxt_ptp_caps = {
 	.pps		= 0,
 	.adjfreq	= bnxt_ptp_adjfreq,
 	.adjtime	= bnxt_ptp_adjtime,
+	.do_aux_work	= bnxt_ptp_ts_aux_work,
 	.gettimex64	= bnxt_ptp_gettimex,
 	.settime64	= bnxt_ptp_settime,
 	.enable		= bnxt_ptp_enable,
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h
index 93a9921a8b46..61a67055c812 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h
@@ -60,6 +60,7 @@ struct bnxt_ptp_cfg {
 
 int bnxt_hwtstamp_set(struct net_device *dev, struct ifreq *ifr);
 int bnxt_hwtstamp_get(struct net_device *dev, struct ifreq *ifr);
+void bnxt_ptp_start(struct bnxt *bp);
 int bnxt_ptp_init(struct bnxt *bp);
 void bnxt_ptp_clear(struct bnxt *bp);
 #endif
-- 
2.18.1


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