[PATCH v1] net/ice: fix incorrect reading of PHY timestamp

[Singh, Aman Deep]

On 25-10-2024 15:56, Soumyadeep Hore wrote:
> In ICE PMD, previously the ready bitmap checking before reading
> PHY timestamp was not present. This caused incorrect Tx
> timestamping.
>
> The ready bitmap checking is enabled and PHY timestamp is read once
> the ready bitmap gives positive value.
>
> Fixes: 881169950d80 ("net/ice/base: implement initial PTP support for E830")
> Cc:stable at dpdk.org
>
> Signed-off-by: Soumyadeep Hore<soumyadeep.hore at intel.com>

Acked-by: Aman Singh<aman.deep.singh at intel.com>

> ---
>   drivers/net/ice/ice_ethdev.c | 18 +++++++++++++++++-
>   1 file changed, 17 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ice/ice_ethdev.c b/drivers/net/ice/ice_ethdev.c
> index 70298ac330..efc6db4346 100644
> --- a/drivers/net/ice/ice_ethdev.c
> +++ b/drivers/net/ice/ice_ethdev.c
> @@ -6597,10 +6597,26 @@ ice_timesync_read_tx_timestamp(struct rte_eth_dev *dev,
>   	struct ice_hw *hw = ICE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
>   	struct ice_adapter *ad =
>   			ICE_DEV_PRIVATE_TO_ADAPTER(dev->data->dev_private);
> -	uint64_t ts_ns, tstamp;
> +	uint64_t ts_ns, tstamp, tstamp_ready = 0;
> +	uint64_t start_time, curr_time;
>   	const uint64_t mask = 0xFFFFFFFF;
>   	int ret;
>   
> +	start_time = rte_get_timer_cycles() / (rte_get_timer_hz() / 1000);
> +
> +	while (!(tstamp_ready & BIT_ULL(0))) {
> +		ret = ice_get_phy_tx_tstamp_ready(hw, ad->ptp_tx_block, &tstamp_ready);
> +		if (ret) {
> +			PMD_DRV_LOG(ERR, "Failed to get phy ready for timestamp");
> +			return -1;
> +		}
> +		curr_time = rte_get_timer_cycles() / (rte_get_timer_hz() / 1000);
> +		if (curr_time - start_time > 1000) {
> +			PMD_DRV_LOG(ERR, "Timeout to get phy ready for timestamp");
> +			return -1;
> +		}
> +	}
> +
>   	ret = ice_read_phy_tstamp(hw, ad->ptp_tx_block, ad->ptp_tx_index, &tstamp);
>   	if (ret || tstamp == 0) {
>   		PMD_DRV_LOG(ERR, "Failed to read phy timestamp");
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