[xdp-hints] [PATCH RFC bpf-next 1/9] i40e: Refactor i40e_ptp_rx_hwtstamp

[Jesper Dangaard Brouer <brouer@redhat.com>]

No functional change, this is in preparation for later patches.

Introduce i40e_ptp_rx_hwtstamp_raw() that doesn't depend on skb pointer
as input. Keep i40e_ptp_rx_hwtstamp with same semantics as before.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
---
 drivers/net/ethernet/intel/i40e/i40e.h     |    1 +
 drivers/net/ethernet/intel/i40e/i40e_ptp.c |   36 +++++++++++++++++++++-------
 2 files changed, 28 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
index 57f4ec4f8d2f..9eb6ea92eafe 100644
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -1246,6 +1246,7 @@ void i40e_ptp_rx_hang(struct i40e_pf *pf);
 void i40e_ptp_tx_hang(struct i40e_pf *pf);
 void i40e_ptp_tx_hwtstamp(struct i40e_pf *pf);
 void i40e_ptp_rx_hwtstamp(struct i40e_pf *pf, struct sk_buff *skb, u8 index);
+u64  i40e_ptp_rx_hwtstamp_raw(struct i40e_pf *pf, u8 index);
 void i40e_ptp_set_increment(struct i40e_pf *pf);
 int i40e_ptp_set_ts_config(struct i40e_pf *pf, struct ifreq *ifr);
 int i40e_ptp_get_ts_config(struct i40e_pf *pf, struct ifreq *ifr);
diff --git a/drivers/net/ethernet/intel/i40e/i40e_ptp.c b/drivers/net/ethernet/intel/i40e/i40e_ptp.c
index 61e5789d78db..8906e4bbf291 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ptp.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ptp.c
@@ -816,18 +816,16 @@ void i40e_ptp_tx_hwtstamp(struct i40e_pf *pf)
 }
 
 /**
- * i40e_ptp_rx_hwtstamp - Utility function which checks for an Rx timestamp
+ * i40e_ptp_rx_hwtstamp_raw - Utility function which checks for an Rx timestamp
  * @pf: Board private structure
- * @skb: Particular skb to send timestamp with
  * @index: Index into the receive timestamp registers for the timestamp
  *
  * The XL710 receives a notification in the receive descriptor with an offset
- * into the set of RXTIME registers where the timestamp is for that skb. This
+ * into the set of RXTIME registers where the timestamp is for that pkt. This
  * function goes and fetches the receive timestamp from that offset, if a valid
- * one exists. The RXTIME registers are in ns, so we must convert the result
- * first.
+ * one exists, else zero is returned.
  **/
-void i40e_ptp_rx_hwtstamp(struct i40e_pf *pf, struct sk_buff *skb, u8 index)
+u64 i40e_ptp_rx_hwtstamp_raw(struct i40e_pf *pf, u8 index)
 {
 	u32 prttsyn_stat, hi, lo;
 	struct i40e_hw *hw;
@@ -837,7 +835,7 @@ void i40e_ptp_rx_hwtstamp(struct i40e_pf *pf, struct sk_buff *skb, u8 index)
 	 * doing Tx timestamping, check if Rx timestamping is configured.
 	 */
 	if (!(pf->flags & I40E_FLAG_PTP) || !pf->ptp_rx)
-		return;
+		return 0;
 
 	hw = &pf->hw;
 
@@ -849,7 +847,7 @@ void i40e_ptp_rx_hwtstamp(struct i40e_pf *pf, struct sk_buff *skb, u8 index)
 	/* TODO: Should we warn about missing Rx timestamp event? */
 	if (!(prttsyn_stat & BIT(index))) {
 		spin_unlock_bh(&pf->ptp_rx_lock);
-		return;
+		return 0;
 	}
 
 	/* Clear the latched event since we're about to read its register */
@@ -862,7 +860,27 @@ void i40e_ptp_rx_hwtstamp(struct i40e_pf *pf, struct sk_buff *skb, u8 index)
 
 	ns = (((u64)hi) << 32) | lo;
 
-	i40e_ptp_convert_to_hwtstamp(skb_hwtstamps(skb), ns);
+	return ns;
+}
+
+/**
+ * i40e_ptp_rx_hwtstamp - Utility function which checks for an Rx timestamp
+ * @pf: Board private structure
+ * @skb: Particular skb to send timestamp with
+ * @index: Index into the receive timestamp registers for the timestamp
+ *
+ * The XL710 receives a notification in the receive descriptor with an offset
+ * into the set of RXTIME registers where the timestamp is for that skb. This
+ * function goes and fetches the receive timestamp from that offset, if a valid
+ * one exists. The RXTIME registers are in ns, so we must convert the result
+ * first.
+ **/
+void i40e_ptp_rx_hwtstamp(struct i40e_pf *pf, struct sk_buff *skb, u8 index)
+{
+	u64 ns = i40e_ptp_rx_hwtstamp_raw(pf, index);
+
+	if (ns)
+		i40e_ptp_convert_to_hwtstamp(skb_hwtstamps(skb), ns);
 }
 
 /**