On Wed, 2017-02-15 at 10:24 +0200, Yuval Mintz wrote:
> From: Sudarsana Reddy Kalluru <sudarsana.kall...@cavium.com>
>
> This patch adds the driver support for,
> - Registering the ptp clock functionality with the OS.
> - Timestamping the Rx/Tx PTP packets.
> - Ethtool callbacks related to PTP.
> +void qede_ptp_tx_ts(struct qede_dev *edev, struct sk_buff *skb)
> +{
> + struct qede_ptp *ptp;
> +
> + ptp = edev->ptp;
> + if (!ptp)
> + return;
> +
> + if (unlikely(!(edev->flags & QEDE_TX_TIMESTAMPING_EN))) {
> + DP_NOTICE(edev,
> + "Tx timestamping was not enabled, this packet will
> not be timestamped\n");
> + } else if (unlikely(ptp->tx_skb)) {
> + DP_NOTICE(edev,
> + "The device supports only a single outstanding packet
> to timestamp, this packet will not be timestamped\n");
> + } else {
> + skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
> + /* schedule check for Tx timestamp */
> + ptp->tx_skb = skb_get(skb);
> + schedule_work(&ptp->work);
> + }
> +}
This is a multi queue device.
Therefore multiple cpus could call this function at the same time.
ptp->tx_skb needs some kind of SMP protection.
