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Date: Wed, 5 Dec 2018 01:25:36 +0000
From: Saeed Mahameed <saeedm@...lanox.com>
To: "mlichvar@...hat.com" <mlichvar@...hat.com>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"haliu@...hat.com" <haliu@...hat.com>,
"richardcochran@...il.com" <richardcochran@...il.com>
Subject: Re: [PATCH mlx5-next 2/2] mlx5: extend PTP gettime function to read
system clock
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@...il.com>
> Cc: Saeed Mahameed <saeedm@...lanox.com>
> Signed-off-by: Miroslav Lichvar <mlichvar@...hat.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);
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