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Message-ID: <0f62faa4-608f-4e8e-98e5-7e6e50e20308@kernel.org>
Date: Mon, 26 Feb 2024 14:49:12 +0200
From: Roger Quadros <rogerq@...nel.org>
To: Chintan Vankar <c-vankar@...com>, Dan Carpenter
<dan.carpenter@...aro.org>, Siddharth Vadapalli <s-vadapalli@...com>,
Richard Cochran <richardcochran@...il.com>, Paolo Abeni <pabeni@...hat.com>,
Jakub Kicinski <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>,
"David S. Miller" <davem@...emloft.net>
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 1/2] net: ethernet: ti: am65-cpts: Enable PTP RX
HW timestamp using CPTS FIFO
On 26/02/2024 11:08, Chintan Vankar wrote:
>
> On 19/02/24 16:54, Roger Quadros wrote:
>>
>> On 15/02/2024 13:09, Chintan Vankar wrote:
>>> CPTS module supports capturing timestamp for every packet it receives,
>>> add a new function named "am65_cpts_rx_find_ts()" to get the timestamp
>>> of received packets from CPTS FIFO.
>>>
>>> Add another function named "am65_cpts_rx_timestamp()" which internally
>>> calls "am65_cpts_rx_find_ts()" function and timestamps the received
>>> PTP packets.
>>>
>>> Signed-off-by: Chintan Vankar <c-vankar@...com>
>>> ---
>>> drivers/net/ethernet/ti/am65-cpts.c | 84 +++++++++++++++++++++--------
>>> drivers/net/ethernet/ti/am65-cpts.h | 11 ++--
>>> 2 files changed, 67 insertions(+), 28 deletions(-)
>>>
>>> diff --git a/drivers/net/ethernet/ti/am65-cpts.c b/drivers/net/ethernet/ti/am65-cpts.c
>>> index c66618d91c28..92a3b40e60d6 100644
>>> --- a/drivers/net/ethernet/ti/am65-cpts.c
>>> +++ b/drivers/net/ethernet/ti/am65-cpts.c
>>> @@ -859,29 +859,6 @@ static long am65_cpts_ts_work(struct ptp_clock_info *ptp)
>>> return delay;
>>> }
>>> -/**
>>> - * am65_cpts_rx_enable - enable rx timestamping
>>> - * @cpts: cpts handle
>>> - * @en: enable
>>> - *
>>> - * This functions enables rx packets timestamping. The CPTS can timestamp all
>>> - * rx packets.
>>> - */
>>> -void am65_cpts_rx_enable(struct am65_cpts *cpts, bool en)
>>> -{
>>> - u32 val;
>>> -
>>> - mutex_lock(&cpts->ptp_clk_lock);
>>> - val = am65_cpts_read32(cpts, control);
>>> - if (en)
>>> - val |= AM65_CPTS_CONTROL_TSTAMP_EN;
>>> - else
>>> - val &= ~AM65_CPTS_CONTROL_TSTAMP_EN;
>>> - am65_cpts_write32(cpts, val, control);
>>> - mutex_unlock(&cpts->ptp_clk_lock);
>>> -}
>>> -EXPORT_SYMBOL_GPL(am65_cpts_rx_enable);
>>> -
>>> static int am65_skb_get_mtype_seqid(struct sk_buff *skb, u32 *mtype_seqid)
>>> {
>>> unsigned int ptp_class = ptp_classify_raw(skb);
>>> @@ -906,6 +883,67 @@ static int am65_skb_get_mtype_seqid(struct sk_buff *skb, u32 *mtype_seqid)
>>> return 1;
>>> }
>>> +static u64 am65_cpts_find_rx_ts(struct am65_cpts *cpts, struct sk_buff *skb,
>>> + int ev_type, u32 skb_mtype_seqid)
>>> +{
>>> + struct list_head *this, *next;
>>> + struct am65_cpts_event *event;
>>> + unsigned long flags;
>>> + u32 mtype_seqid;
>>> + u64 ns = 0;
>>> +
>>> + am65_cpts_fifo_read(cpts);
>> am65_cpts_fifo_read() is called from the CPTS interrupt handler and the
>> event is popped out of the FIFO and pushed into an event list.
>>
>> Doesn't this race with that interrupt handler?
> Could you clarify why there be a race condition ?
I'm not sure so was asking. The question is, do you have to call
am65_cpts_fifo_read() here? If yes, could you please add a comment why.
>> Can't you use that event list instead of reading cpts_fifo directly?
>>
>> Something like am65_cpts_match_tx_ts()?
>>
>>> + spin_lock_irqsave(&cpts->lock, flags);
>>> + list_for_each_safe(this, next, &cpts->events) {
>>> + event = list_entry(this, struct am65_cpts_event, list);
>>> + if (time_after(jiffies, event->tmo)) {
>>> + list_del_init(&event->list);
>>> + list_add(&event->list, &cpts->pool);
>>> + continue;
>>> + }
>>> +
>>> + mtype_seqid = event->event1 &
>>> + (AM65_CPTS_EVENT_1_MESSAGE_TYPE_MASK |
>>> + AM65_CPTS_EVENT_1_SEQUENCE_ID_MASK |
>>> + AM65_CPTS_EVENT_1_EVENT_TYPE_MASK);
>>> +
>>> + if (mtype_seqid == skb_mtype_seqid) {
>>> + ns = event->timestamp;
>>> + list_del_init(&event->list);
>>> + list_add(&event->list, &cpts->pool);
>>> + break;
>>> + }
>>> + }
>>> + spin_unlock_irqrestore(&cpts->lock, flags);
>>> +
>>> + return ns;
>>> +}
>>> +
>>> +void am65_cpts_rx_timestamp(struct am65_cpts *cpts, struct sk_buff *skb)
>>> +{
>>> + struct am65_cpts_skb_cb_data *skb_cb = (struct am65_cpts_skb_cb_data *)skb->cb;
>>> + struct skb_shared_hwtstamps *ssh;
>>> + int ret;
>>> + u64 ns;
>>> +
>>> + ret = am65_skb_get_mtype_seqid(skb, &skb_cb->skb_mtype_seqid);
>>> + if (!ret)
>>> + return; /* if not PTP class packet */
>>> +
>>> + skb_cb->skb_mtype_seqid |= (AM65_CPTS_EV_RX << AM65_CPTS_EVENT_1_EVENT_TYPE_SHIFT);
>>> +
>>> + dev_dbg(cpts->dev, "%s mtype seqid %08x\n", __func__, skb_cb->skb_mtype_seqid);
>>> +
>>> + ns = am65_cpts_find_rx_ts(cpts, skb, AM65_CPTS_EV_RX, skb_cb->skb_mtype_seqid);
>>> + if (!ns)
>>> + return;
>>> +
>>> + ssh = skb_hwtstamps(skb);
>>> + memset(ssh, 0, sizeof(*ssh));
>>> + ssh->hwtstamp = ns_to_ktime(ns);
>>> +}
>>> +EXPORT_SYMBOL_GPL(am65_cpts_rx_timestamp);
>>> +
>>> /**
>>> * am65_cpts_tx_timestamp - save tx packet for timestamping
>>> * @cpts: cpts handle
>>> diff --git a/drivers/net/ethernet/ti/am65-cpts.h b/drivers/net/ethernet/ti/am65-cpts.h
>>> index 6e14df0be113..6099d772799d 100644
>>> --- a/drivers/net/ethernet/ti/am65-cpts.h
>>> +++ b/drivers/net/ethernet/ti/am65-cpts.h
>>> @@ -22,9 +22,9 @@ void am65_cpts_release(struct am65_cpts *cpts);
>>> struct am65_cpts *am65_cpts_create(struct device *dev, void __iomem *regs,
>>> struct device_node *node);
>>> int am65_cpts_phc_index(struct am65_cpts *cpts);
>>> +void am65_cpts_rx_timestamp(struct am65_cpts *cpts, struct sk_buff *skb);
>>> void am65_cpts_tx_timestamp(struct am65_cpts *cpts, struct sk_buff *skb);
>>> void am65_cpts_prep_tx_timestamp(struct am65_cpts *cpts, struct sk_buff *skb);
>>> -void am65_cpts_rx_enable(struct am65_cpts *cpts, bool en);
>>> u64 am65_cpts_ns_gettime(struct am65_cpts *cpts);
>>> int am65_cpts_estf_enable(struct am65_cpts *cpts, int idx,
>>> struct am65_cpts_estf_cfg *cfg);
>>> @@ -48,17 +48,18 @@ static inline int am65_cpts_phc_index(struct am65_cpts *cpts)
>>> return -1;
>>> }
>>> -static inline void am65_cpts_tx_timestamp(struct am65_cpts *cpts,
>>> +static inline void am65_cpts_rx_timestamp(struct am65_cpts *cpts,
>>> struct sk_buff *skb)
>>> {
>>> }
>>> -static inline void am65_cpts_prep_tx_timestamp(struct am65_cpts *cpts,
>>> - struct sk_buff *skb)
>>> +static inline void am65_cpts_tx_timestamp(struct am65_cpts *cpts,
>>> + struct sk_buff *skb)
>>> {
>>> }
>>> -static inline void am65_cpts_rx_enable(struct am65_cpts *cpts, bool en)
>>> +static inline void am65_cpts_prep_tx_timestamp(struct am65_cpts *cpts,
>>> + struct sk_buff *skb)
>>> {
>>> }
>>>
--
cheers,
-roger
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