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bnxt_en: Get the full 48-bit hardware timestamp periodically

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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@broadcom.com>
Signed-off-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavan Chebbi 2021-06-27 13:19:47 -04:00 committed by David S. Miller
parent 118612d519
commit 390862f45c
3 changed files with 41 additions and 0 deletions
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1
drivers/net/ethernet/broadcom/bnxt/bnxt.c
View File

@ -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);

39
drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
View File

@ -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,

1
drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h
View File

@ -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