* [PATCH mlx5-next 0/2] Improvements for PTP clock in mlx5 driver
@ 2018-12-03 12:59 Miroslav Lichvar
2018-12-03 12:59 ` [PATCH mlx5-next 1/2] mlx5: update timecounter at least twice per counter overflow Miroslav Lichvar
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: Miroslav Lichvar @ 2018-12-03 12:59 UTC (permalink / raw)
To: Saeed Mahameed; +Cc: netdev, Richard Cochran, Hangbin Liu, Miroslav Lichvar
This is a pair of patches for the mlx5 driver related to the PTP clock.
The first patch fixes a potential issue causing backward jumps due to a
late update of the PHC timecounter.
The second patch adds support for the PTP_SYS_OFFSET_EXTENDED ioctl.
Miroslav Lichvar (2):
mlx5: update timecounter at least twice per counter overflow
mlx5: extend PTP gettime function to read system clock
.../ethernet/mellanox/mlx5/core/lib/clock.c | 24 +++++++++++--------
.../net/ethernet/mellanox/mlx5/core/main.c | 11 +++++++--
.../ethernet/mellanox/mlx5/core/mlx5_core.h | 4 +++-
3 files changed, 26 insertions(+), 13 deletions(-)
--
2.17.2
^ permalink raw reply [flat|nested] 5+ messages in thread* [PATCH mlx5-next 1/2] mlx5: update timecounter at least twice per counter overflow 2018-12-03 12:59 [PATCH mlx5-next 0/2] Improvements for PTP clock in mlx5 driver Miroslav Lichvar @ 2018-12-03 12:59 ` Miroslav Lichvar 2018-12-03 12:59 ` [PATCH mlx5-next 2/2] mlx5: extend PTP gettime function to read system clock Miroslav Lichvar 2018-12-12 3:41 ` [PATCH mlx5-next 0/2] Improvements for PTP clock in mlx5 driver Saeed Mahameed 2 siblings, 0 replies; 5+ messages in thread From: Miroslav Lichvar @ 2018-12-03 12:59 UTC (permalink / raw) To: Saeed Mahameed Cc: netdev, Richard Cochran, Hangbin Liu, Miroslav Lichvar, Ariel Levkovich The timecounter needs to be updated at least once in half of the cyclecounter interval to prevent timecounter_cyc2time() interpreting a new timestamp as an old value and causing a backward jump. This would be an issue if the timecounter multiplier was so small that the update interval would not be limited by the 64-bit overflow in multiplication. Shorten the calculated interval to make sure the timecounter is updated in time even when the system clock is slowed down by up to 10%, the multiplier is increased by up to 10%, and the scheduled overflow check is late by 15%. Cc: Richard Cochran <richardcochran@gmail.com> Cc: Ariel Levkovich <lariel@mellanox.com> Cc: Saeed Mahameed <saeedm@mellanox.com> Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com> --- drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c index 0d90b1b4a3d3..2d6168ee99e8 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c @@ -511,14 +511,14 @@ void mlx5_init_clock(struct mlx5_core_dev *mdev) ktime_to_ns(ktime_get_real())); /* Calculate period in seconds to call the overflow watchdog - to make - * sure counter is checked at least once every wrap around. + * sure counter is checked at least twice every wrap around. * The period is calculated as the minimum between max HW cycles count * (The clock source mask) and max amount of cycles that can be * multiplied by clock multiplier where the result doesn't exceed * 64bits. */ overflow_cycles = div64_u64(~0ULL >> 1, clock->cycles.mult); - overflow_cycles = min(overflow_cycles, clock->cycles.mask >> 1); + overflow_cycles = min(overflow_cycles, div_u64(clock->cycles.mask, 3)); ns = cyclecounter_cyc2ns(&clock->cycles, overflow_cycles, frac, &frac); -- 2.17.2 ^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH mlx5-next 2/2] mlx5: extend PTP gettime function to read system clock 2018-12-03 12:59 [PATCH mlx5-next 0/2] Improvements for PTP clock in mlx5 driver Miroslav Lichvar 2018-12-03 12:59 ` [PATCH mlx5-next 1/2] mlx5: update timecounter at least twice per counter overflow Miroslav Lichvar @ 2018-12-03 12:59 ` Miroslav Lichvar 2018-12-05 1:25 ` Saeed Mahameed 2018-12-12 3:41 ` [PATCH mlx5-next 0/2] Improvements for PTP clock in mlx5 driver Saeed Mahameed 2 siblings, 1 reply; 5+ messages in thread From: Miroslav Lichvar @ 2018-12-03 12:59 UTC (permalink / raw) To: Saeed Mahameed; +Cc: netdev, Richard Cochran, Hangbin Liu, Miroslav Lichvar Read the system time right before and immediately after reading the low register of the internal timer. This adds support for the PTP_SYS_OFFSET_EXTENDED ioctl. Cc: Richard Cochran <richardcochran@gmail.com> Cc: Saeed Mahameed <saeedm@mellanox.com> Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com> --- .../ethernet/mellanox/mlx5/core/lib/clock.c | 20 +++++++++++-------- .../net/ethernet/mellanox/mlx5/core/main.c | 11 ++++++++-- .../ethernet/mellanox/mlx5/core/mlx5_core.h | 4 +++- 3 files changed, 24 insertions(+), 11 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c index 2d6168ee99e8..f9618047c16a 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c @@ -71,7 +71,7 @@ static u64 read_internal_timer(const struct cyclecounter *cc) struct mlx5_core_dev *mdev = container_of(clock, struct mlx5_core_dev, clock); - return mlx5_read_internal_timer(mdev) & cc->mask; + return mlx5_read_internal_timer(mdev, NULL) & cc->mask; } static void mlx5_update_clock_info_page(struct mlx5_core_dev *mdev) @@ -155,15 +155,19 @@ static int mlx5_ptp_settime(struct ptp_clock_info *ptp, return 0; } -static int mlx5_ptp_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts) +static int mlx5_ptp_gettimex(struct ptp_clock_info *ptp, struct timespec64 *ts, + struct ptp_system_timestamp *sts) { struct mlx5_clock *clock = container_of(ptp, struct mlx5_clock, ptp_info); - u64 ns; + struct mlx5_core_dev *mdev = container_of(clock, struct mlx5_core_dev, + clock); unsigned long flags; + u64 cycles, ns; write_seqlock_irqsave(&clock->lock, flags); - ns = timecounter_read(&clock->tc); + cycles = mlx5_read_internal_timer(mdev, sts); + ns = timecounter_cyc2time(&clock->tc, cycles); write_sequnlock_irqrestore(&clock->lock, flags); *ts = ns_to_timespec64(ns); @@ -306,7 +310,7 @@ static int mlx5_perout_configure(struct ptp_clock_info *ptp, ts.tv_sec = rq->perout.start.sec; ts.tv_nsec = rq->perout.start.nsec; ns = timespec64_to_ns(&ts); - cycles_now = mlx5_read_internal_timer(mdev); + cycles_now = mlx5_read_internal_timer(mdev, NULL); write_seqlock_irqsave(&clock->lock, flags); nsec_now = timecounter_cyc2time(&clock->tc, cycles_now); nsec_delta = ns - nsec_now; @@ -383,7 +387,7 @@ static const struct ptp_clock_info mlx5_ptp_clock_info = { .pps = 0, .adjfreq = mlx5_ptp_adjfreq, .adjtime = mlx5_ptp_adjtime, - .gettime64 = mlx5_ptp_gettime, + .gettimex64 = mlx5_ptp_gettimex, .settime64 = mlx5_ptp_settime, .enable = NULL, .verify = NULL, @@ -466,8 +470,8 @@ void mlx5_pps_event(struct mlx5_core_dev *mdev, ptp_clock_event(clock->ptp, &ptp_event); break; case PTP_PF_PEROUT: - mlx5_ptp_gettime(&clock->ptp_info, &ts); - cycles_now = mlx5_read_internal_timer(mdev); + mlx5_ptp_gettimex(&clock->ptp_info, &ts, NULL); + cycles_now = mlx5_read_internal_timer(mdev, NULL); ts.tv_sec += 1; ts.tv_nsec = 0; ns = timespec64_to_ns(&ts); diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c index 28132c7dc05f..6f1cf291df7e 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/main.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c @@ -624,15 +624,22 @@ int mlx5_core_disable_hca(struct mlx5_core_dev *dev, u16 func_id) return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out)); } -u64 mlx5_read_internal_timer(struct mlx5_core_dev *dev) +u64 mlx5_read_internal_timer(struct mlx5_core_dev *dev, + struct ptp_system_timestamp *sts) { u32 timer_h, timer_h1, timer_l; timer_h = ioread32be(&dev->iseg->internal_timer_h); + ptp_read_system_prets(sts); timer_l = ioread32be(&dev->iseg->internal_timer_l); + ptp_read_system_postts(sts); timer_h1 = ioread32be(&dev->iseg->internal_timer_h); - if (timer_h != timer_h1) /* wrap around */ + if (timer_h != timer_h1) { + /* wrap around */ + ptp_read_system_prets(sts); timer_l = ioread32be(&dev->iseg->internal_timer_l); + ptp_read_system_postts(sts); + } return (u64)timer_l | (u64)timer_h1 << 32; } diff --git a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h index 0594d0961cb3..3d66afc9b7a5 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h +++ b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h @@ -38,6 +38,7 @@ #include <linux/sched.h> #include <linux/if_link.h> #include <linux/firmware.h> +#include <linux/ptp_clock_kernel.h> #include <linux/mlx5/cq.h> #include <linux/mlx5/fs.h> @@ -122,7 +123,8 @@ int mlx5_modify_scheduling_element_cmd(struct mlx5_core_dev *dev, u8 hierarchy, int mlx5_destroy_scheduling_element_cmd(struct mlx5_core_dev *dev, u8 hierarchy, u32 element_id); int mlx5_wait_for_vf_pages(struct mlx5_core_dev *dev); -u64 mlx5_read_internal_timer(struct mlx5_core_dev *dev); +u64 mlx5_read_internal_timer(struct mlx5_core_dev *dev, + struct ptp_system_timestamp *sts); int mlx5_eq_init(struct mlx5_core_dev *dev); void mlx5_eq_cleanup(struct mlx5_core_dev *dev); -- 2.17.2 ^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH mlx5-next 2/2] mlx5: extend PTP gettime function to read system clock 2018-12-03 12:59 ` [PATCH mlx5-next 2/2] mlx5: extend PTP gettime function to read system clock Miroslav Lichvar @ 2018-12-05 1:25 ` Saeed Mahameed 0 siblings, 0 replies; 5+ messages in thread From: Saeed Mahameed @ 2018-12-05 1:25 UTC (permalink / raw) To: mlichvar; +Cc: netdev, haliu, richardcochran On Mon, 2018-12-03 at 13:59 +0100, Miroslav Lichvar wrote: > Read the system time right before and immediately after reading the > low > register of the internal timer. This adds support for the > PTP_SYS_OFFSET_EXTENDED ioctl. > > Cc: Richard Cochran <richardcochran@gmail.com> > Cc: Saeed Mahameed <saeedm@mellanox.com> > Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com> Hi Miroslav, the two patches look good to me, i am waiting for Ariel's feedback on the first patch and then i am going to merge them to mlx5-next branch then send them later to netdev (net-next). > --- > .../ethernet/mellanox/mlx5/core/lib/clock.c | 20 +++++++++++---- > ---- > .../net/ethernet/mellanox/mlx5/core/main.c | 11 ++++++++-- > .../ethernet/mellanox/mlx5/core/mlx5_core.h | 4 +++- > 3 files changed, 24 insertions(+), 11 deletions(-) > > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c > b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c > index 2d6168ee99e8..f9618047c16a 100644 > --- a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c > +++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c > @@ -71,7 +71,7 @@ static u64 read_internal_timer(const struct > cyclecounter *cc) > struct mlx5_core_dev *mdev = container_of(clock, struct > mlx5_core_dev, > clock); > > - return mlx5_read_internal_timer(mdev) & cc->mask; > + return mlx5_read_internal_timer(mdev, NULL) & cc->mask; > } > > static void mlx5_update_clock_info_page(struct mlx5_core_dev *mdev) > @@ -155,15 +155,19 @@ static int mlx5_ptp_settime(struct > ptp_clock_info *ptp, > return 0; > } > > -static int mlx5_ptp_gettime(struct ptp_clock_info *ptp, struct > timespec64 *ts) > +static int mlx5_ptp_gettimex(struct ptp_clock_info *ptp, struct > timespec64 *ts, > + struct ptp_system_timestamp *sts) > { > struct mlx5_clock *clock = container_of(ptp, struct mlx5_clock, > ptp_info); > - u64 ns; > + struct mlx5_core_dev *mdev = container_of(clock, struct > mlx5_core_dev, > + clock); > unsigned long flags; > + u64 cycles, ns; > > write_seqlock_irqsave(&clock->lock, flags); > - ns = timecounter_read(&clock->tc); > + cycles = mlx5_read_internal_timer(mdev, sts); > + ns = timecounter_cyc2time(&clock->tc, cycles); > write_sequnlock_irqrestore(&clock->lock, flags); > > *ts = ns_to_timespec64(ns); > @@ -306,7 +310,7 @@ static int mlx5_perout_configure(struct > ptp_clock_info *ptp, > ts.tv_sec = rq->perout.start.sec; > ts.tv_nsec = rq->perout.start.nsec; > ns = timespec64_to_ns(&ts); > - cycles_now = mlx5_read_internal_timer(mdev); > + cycles_now = mlx5_read_internal_timer(mdev, NULL); > write_seqlock_irqsave(&clock->lock, flags); > nsec_now = timecounter_cyc2time(&clock->tc, > cycles_now); > nsec_delta = ns - nsec_now; > @@ -383,7 +387,7 @@ static const struct ptp_clock_info > mlx5_ptp_clock_info = { > .pps = 0, > .adjfreq = mlx5_ptp_adjfreq, > .adjtime = mlx5_ptp_adjtime, > - .gettime64 = mlx5_ptp_gettime, > + .gettimex64 = mlx5_ptp_gettimex, > .settime64 = mlx5_ptp_settime, > .enable = NULL, > .verify = NULL, > @@ -466,8 +470,8 @@ void mlx5_pps_event(struct mlx5_core_dev *mdev, > ptp_clock_event(clock->ptp, &ptp_event); > break; > case PTP_PF_PEROUT: > - mlx5_ptp_gettime(&clock->ptp_info, &ts); > - cycles_now = mlx5_read_internal_timer(mdev); > + mlx5_ptp_gettimex(&clock->ptp_info, &ts, NULL); > + cycles_now = mlx5_read_internal_timer(mdev, NULL); > ts.tv_sec += 1; > ts.tv_nsec = 0; > ns = timespec64_to_ns(&ts); > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c > b/drivers/net/ethernet/mellanox/mlx5/core/main.c > index 28132c7dc05f..6f1cf291df7e 100644 > --- a/drivers/net/ethernet/mellanox/mlx5/core/main.c > +++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c > @@ -624,15 +624,22 @@ int mlx5_core_disable_hca(struct mlx5_core_dev > *dev, u16 func_id) > return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out)); > } > > -u64 mlx5_read_internal_timer(struct mlx5_core_dev *dev) > +u64 mlx5_read_internal_timer(struct mlx5_core_dev *dev, > + struct ptp_system_timestamp *sts) > { > u32 timer_h, timer_h1, timer_l; > > timer_h = ioread32be(&dev->iseg->internal_timer_h); > + ptp_read_system_prets(sts); > timer_l = ioread32be(&dev->iseg->internal_timer_l); > + ptp_read_system_postts(sts); > timer_h1 = ioread32be(&dev->iseg->internal_timer_h); > - if (timer_h != timer_h1) /* wrap around */ > + if (timer_h != timer_h1) { > + /* wrap around */ > + ptp_read_system_prets(sts); > timer_l = ioread32be(&dev->iseg->internal_timer_l); > + ptp_read_system_postts(sts); > + } > > return (u64)timer_l | (u64)timer_h1 << 32; > } > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h > b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h > index 0594d0961cb3..3d66afc9b7a5 100644 > --- a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h > +++ b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h > @@ -38,6 +38,7 @@ > #include <linux/sched.h> > #include <linux/if_link.h> > #include <linux/firmware.h> > +#include <linux/ptp_clock_kernel.h> > #include <linux/mlx5/cq.h> > #include <linux/mlx5/fs.h> > > @@ -122,7 +123,8 @@ int mlx5_modify_scheduling_element_cmd(struct > mlx5_core_dev *dev, u8 hierarchy, > int mlx5_destroy_scheduling_element_cmd(struct mlx5_core_dev *dev, > u8 hierarchy, > u32 element_id); > int mlx5_wait_for_vf_pages(struct mlx5_core_dev *dev); > -u64 mlx5_read_internal_timer(struct mlx5_core_dev *dev); > +u64 mlx5_read_internal_timer(struct mlx5_core_dev *dev, > + struct ptp_system_timestamp *sts); > > int mlx5_eq_init(struct mlx5_core_dev *dev); > void mlx5_eq_cleanup(struct mlx5_core_dev *dev); ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH mlx5-next 0/2] Improvements for PTP clock in mlx5 driver 2018-12-03 12:59 [PATCH mlx5-next 0/2] Improvements for PTP clock in mlx5 driver Miroslav Lichvar 2018-12-03 12:59 ` [PATCH mlx5-next 1/2] mlx5: update timecounter at least twice per counter overflow Miroslav Lichvar 2018-12-03 12:59 ` [PATCH mlx5-next 2/2] mlx5: extend PTP gettime function to read system clock Miroslav Lichvar @ 2018-12-12 3:41 ` Saeed Mahameed 2 siblings, 0 replies; 5+ messages in thread From: Saeed Mahameed @ 2018-12-12 3:41 UTC (permalink / raw) To: mlichvar; +Cc: Saeed Mahameed, Linux Netdev List, Richard Cochran, haliu On Mon, Dec 3, 2018 at 4:59 AM Miroslav Lichvar <mlichvar@redhat.com> wrote: > > This is a pair of patches for the mlx5 driver related to the PTP clock. > > The first patch fixes a potential issue causing backward jumps due to a > late update of the PHC timecounter. > > The second patch adds support for the PTP_SYS_OFFSET_EXTENDED ioctl. > > Miroslav Lichvar (2): > mlx5: update timecounter at least twice per counter overflow > mlx5: extend PTP gettime function to read system clock Applied to mlx5-next, will be sent to net-next soon. Thanks! ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2018-12-12 3:41 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2018-12-03 12:59 [PATCH mlx5-next 0/2] Improvements for PTP clock in mlx5 driver Miroslav Lichvar 2018-12-03 12:59 ` [PATCH mlx5-next 1/2] mlx5: update timecounter at least twice per counter overflow Miroslav Lichvar 2018-12-03 12:59 ` [PATCH mlx5-next 2/2] mlx5: extend PTP gettime function to read system clock Miroslav Lichvar 2018-12-05 1:25 ` Saeed Mahameed 2018-12-12 3:41 ` [PATCH mlx5-next 0/2] Improvements for PTP clock in mlx5 driver Saeed Mahameed
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