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Date: Sat, 5 Jun 2021 18:37:19 +0800
From: "huangguangbin (A)" <huangguangbin2@...wei.com>
To: Richard Cochran <richardcochran@...il.com>
CC: <davem@...emloft.net>, <kuba@...nel.org>, <netdev@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <salil.mehta@...wei.com>,
<lipeng321@...wei.com>, <tanhuazhong@...wei.com>
Subject: Re: [RESEND net-next 1/2] net: hns3: add support for PTP
On 2021/6/3 21:22, Richard Cochran wrote:
> On Wed, Jun 02, 2021 at 10:57:43AM +0800, Guangbin Huang wrote:
>
>> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_ptp.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_ptp.c
>> new file mode 100644
>> index 000000000000..b133b5984584
>> --- /dev/null
>> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_ptp.c
>> @@ -0,0 +1,520 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +// Copyright (c) 2021 Hisilicon Limited.
>> +
>> +#include <linux/skbuff.h>
>> +#include "hclge_main.h"
>> +#include "hnae3.h"
>> +
>> +static int hclge_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
>> +{
>> + struct hclge_dev *hdev = hclge_ptp_get_hdev(ptp);
>> + u64 adj_val, adj_base, diff;
>> + bool is_neg = false;
>> + u32 quo, numerator;
>> +
>> + if (ppb < 0) {
>> + ppb = -ppb;
>> + is_neg = true;
>> + }
>> +
>> + adj_base = HCLGE_PTP_CYCLE_ADJ_BASE * HCLGE_PTP_CYCLE_ADJ_UNIT;
>> + adj_val = adj_base * ppb;
>> + diff = div_u64(adj_val, 1000000000ULL);
>> +
>> + if (is_neg)
>> + adj_val = adj_base - diff;
>> + else
>> + adj_val = adj_base + diff;
>> +
>> + /* This clock cycle is defined by three part: quotient, numerator
>> + * and denominator. For example, 2.5ns, the quotient is 2,
>> + * denominator is fixed to HCLGE_PTP_CYCLE_ADJ_UNIT, and numerator
>> + * is 0.5 * HCLGE_PTP_CYCLE_ADJ_UNIT.
>> + */
>> + quo = div_u64_rem(adj_val, HCLGE_PTP_CYCLE_ADJ_UNIT, &numerator);
>> + writel(quo, hdev->ptp->io_base + HCLGE_PTP_CYCLE_QUO_REG);
>> + writel(numerator, hdev->ptp->io_base + HCLGE_PTP_CYCLE_NUM_REG);
>> + writel(HCLGE_PTP_CYCLE_ADJ_UNIT,
>> + hdev->ptp->io_base + HCLGE_PTP_CYCLE_DEN_REG);
>> + writel(HCLGE_PTP_CYCLE_ADJ_EN,
>> + hdev->ptp->io_base + HCLGE_PTP_CYCLE_CFG_REG);
>
> Need mutex or spinlock to protest against concurrent access.
>
Ok, thank you. Is it better to add mutex or spinlock in the public place, like ptp_clock_adjtime()?
Then there's no need to add mutex or spinlock in all the drives.
>> +
>> + return 0;
>> +}
>> +
>> +bool hclge_ptp_set_tx_info(struct hnae3_handle *handle, struct sk_buff *skb)
>> +{
>> + struct hclge_vport *vport = hclge_get_vport(handle);
>> + struct hclge_dev *hdev = vport->back;
>> + struct hclge_ptp *ptp = hdev->ptp;
>> +
>> + if (!test_bit(HCLGE_PTP_FLAG_TX_EN, &ptp->flags) ||
>> + test_and_set_bit(HCLGE_STATE_PTP_TX_HANDLING, &hdev->state)) {
>> + ptp->tx_skipped++;
>> + return false;
>> + }
>> +
>> + ptp->tx_start = jiffies;
>> + ptp->tx_skb = skb_get(skb);
>> + ptp->tx_cnt++;
>> +
>> + return true;
>> +}
>> +
>> +void hclge_ptp_clean_tx_hwts(struct hclge_dev *hdev)
>> +{
>> + struct sk_buff *skb = hdev->ptp->tx_skb;
>> + struct skb_shared_hwtstamps hwts;
>> + u32 hi, lo;
>> + u64 ns;
>> +
>> + ns = readl(hdev->ptp->io_base + HCLGE_PTP_TX_TS_NSEC_REG) &
>> + HCLGE_PTP_TX_TS_NSEC_MASK;
>> + lo = readl(hdev->ptp->io_base + HCLGE_PTP_TX_TS_SEC_L_REG);
>> + hi = readl(hdev->ptp->io_base + HCLGE_PTP_TX_TS_SEC_H_REG) &
>> + HCLGE_PTP_TX_TS_SEC_H_MASK;
>> + hdev->ptp->last_tx_seqid = readl(hdev->ptp->io_base +
>> + HCLGE_PTP_TX_TS_SEQID_REG);
>> +
>> + if (skb) {
>> + hdev->ptp->tx_skb = NULL;
>> + hdev->ptp->tx_cleaned++;
>> +
>> + ns += (((u64)hi) << 32 | lo) * NSEC_PER_SEC;
>> + hwts.hwtstamp = ns_to_ktime(ns);
>> + skb_tstamp_tx(skb, &hwts);
>> + dev_kfree_skb_any(skb);
>> + }
>> +
>> + clear_bit(HCLGE_STATE_PTP_TX_HANDLING, &hdev->state);
>> +}
>> +
>> +void hclge_ptp_get_rx_hwts(struct hnae3_handle *handle, struct sk_buff *skb,
>> + u32 nsec, u32 sec)
>> +{
>> + struct hclge_vport *vport = hclge_get_vport(handle);
>> + struct hclge_dev *hdev = vport->back;
>> + u64 ns = nsec;
>> + u32 sec_h;
>> +
>> + if (!test_bit(HCLGE_PTP_FLAG_RX_EN, &hdev->ptp->flags))
>> + return;
>> +
>> + /* Since the BD does not have enough space for the higher 16 bits of
>> + * second, and this part will not change frequently, so read it
>> + * from register.
>> + */
>> + sec_h = readl(hdev->ptp->io_base + HCLGE_PTP_CUR_TIME_SEC_H_REG);
>
> Need mutex or spinlock to protest against concurrent acces. >
Same above.
>> + ns += (((u64)sec_h) << HCLGE_PTP_SEC_H_OFFSET | sec) * NSEC_PER_SEC;
>> + skb_hwtstamps(skb)->hwtstamp = ns_to_ktime(ns);
>> + hdev->ptp->last_rx = jiffies;
>> + hdev->ptp->rx_cnt++;
>> +}
>> +
>> +static int hclge_ptp_gettimex(struct ptp_clock_info *ptp, struct timespec64 *ts,
>> + struct ptp_system_timestamp *sts)
>> +{
>> + struct hclge_dev *hdev = hclge_ptp_get_hdev(ptp);
>> + u32 hi, lo;
>> + u64 ns;
>> +
>> + ns = readl(hdev->ptp->io_base + HCLGE_PTP_CUR_TIME_NSEC_REG);
>> + hi = readl(hdev->ptp->io_base + HCLGE_PTP_CUR_TIME_SEC_H_REG);
>> + lo = readl(hdev->ptp->io_base + HCLGE_PTP_CUR_TIME_SEC_L_REG);
>
> Need mutex or spinlock to protest against concurrent access.
>
Same above.
>> + ns += (((u64)hi) << HCLGE_PTP_SEC_H_OFFSET | lo) * NSEC_PER_SEC;
>> + *ts = ns_to_timespec64(ns);
>> +
>> + return 0;
>> +}
>> +
>> +static int hclge_ptp_settime(struct ptp_clock_info *ptp,
>> + const struct timespec64 *ts)
>> +{
>> + struct hclge_dev *hdev = hclge_ptp_get_hdev(ptp);
>> +
>> + writel(ts->tv_nsec, hdev->ptp->io_base + HCLGE_PTP_TIME_NSEC_REG);
>> + writel(ts->tv_sec >> HCLGE_PTP_SEC_H_OFFSET,
>> + hdev->ptp->io_base + HCLGE_PTP_TIME_SEC_H_REG);
>> + writel(ts->tv_sec & HCLGE_PTP_SEC_L_MASK,
>> + hdev->ptp->io_base + HCLGE_PTP_TIME_SEC_L_REG);
>> + /* synchronize the time of phc */
>> + writel(HCLGE_PTP_TIME_SYNC_EN,
>> + hdev->ptp->io_base + HCLGE_PTP_TIME_SYNC_REG);
>
> Need mutex or spinlock to protest against concurrent access.
>
Same above.
>> + return 0;
>> +}
>> +
>> +static int hclge_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
>> +{
>> + struct hclge_dev *hdev = hclge_ptp_get_hdev(ptp);
>> + bool is_neg = false;
>> + u32 adj_val = 0;
>> +
>> + if (delta < 0) {
>> + adj_val |= HCLGE_PTP_TIME_NSEC_NEG;
>> + delta = -delta;
>> + is_neg = true;
>> + }
>> +
>> + if (delta > HCLGE_PTP_TIME_NSEC_MASK) {
>> + struct timespec64 ts;
>> + s64 ns;
>> +
>> + hclge_ptp_gettimex(ptp, &ts, NULL);
>> + ns = timespec64_to_ns(&ts);
>> + ns = is_neg ? ns - delta : ns + delta;
>> + ts = ns_to_timespec64(ns);
>> + return hclge_ptp_settime(ptp, &ts);
>> + }
>> +
>> + adj_val |= delta & HCLGE_PTP_TIME_NSEC_MASK;
>> + writel(adj_val, hdev->ptp->io_base + HCLGE_PTP_TIME_NSEC_REG);
>> + writel(HCLGE_PTP_TIME_ADJ_EN,
>> + hdev->ptp->io_base + HCLGE_PTP_TIME_ADJ_REG);
>
> Need mutex or spinlock to protest against concurrent access.
>
Same above.
>> +
>> + return 0;
>> +}
>
> Thanks,
> Richard
>
> .
>
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