Commit 390862f4 authored by Pavan Chebbi's avatar Pavan Chebbi Committed by David S. Miller
Browse files

bnxt_en: Get the full 48-bit hardware timestamp periodically 



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: default avatarEdwin Peer <edwin.peer@broadcom.com>
Signed-off-by: default avatarPavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: default avatarMichael Chan <michael.chan@broadcom.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 118612d5

drivers/net/ethernet/broadcom/bnxt/bnxt.c

+1 −0
Original line number Diff line number Diff line
@@ -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);

drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c

+39 −0
Original line number Diff line number Diff line
@@ -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,

drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h

+1 −0
Original line number Diff line number Diff line
@@ -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