[PATCH v2 4/9] mlxsw: spectrum_ptp: Use generic helper function

[Kurt Kanzenbach]

In order to reduce code duplication between ptp drivers, generic helper
functions were introduced. Use them.

Signed-off-by: Kurt Kanzenbach <k...@linutronix.de>
---
 .../ethernet/mellanox/mlxsw/spectrum_ptp.c    | 32 ++++---------------
 1 file changed, 7 insertions(+), 25 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c 
b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c
index 9650562fc0ef..ca8090a28dec 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c
@@ -314,11 +314,9 @@ static int mlxsw_sp_ptp_parse(struct sk_buff *skb,
                              u8 *p_message_type,
                              u16 *p_sequence_id)
 {
-       unsigned int offset = 0;
        unsigned int ptp_class;
-       u8 *data;
+       struct ptp_header *hdr;
 
-       data = skb_mac_header(skb);
        ptp_class = ptp_classify_raw(skb);
 
        switch (ptp_class & PTP_CLASS_VMASK) {
@@ -329,30 +327,14 @@ static int mlxsw_sp_ptp_parse(struct sk_buff *skb,
                return -ERANGE;
        }
 
-       if (ptp_class & PTP_CLASS_VLAN)
-               offset += VLAN_HLEN;
-
-       switch (ptp_class & PTP_CLASS_PMASK) {
-       case PTP_CLASS_IPV4:
-               offset += ETH_HLEN + IPV4_HLEN(data + offset) + UDP_HLEN;
-               break;
-       case PTP_CLASS_IPV6:
-               offset += ETH_HLEN + IP6_HLEN + UDP_HLEN;
-               break;
-       case PTP_CLASS_L2:
-               offset += ETH_HLEN;
-               break;
-       default:
-               return -ERANGE;
-       }
-
-       /* PTP header is 34 bytes. */
-       if (skb->len < offset + 34)
+       hdr = ptp_parse_header(skb, ptp_class);
+       if (!hdr)
                return -EINVAL;
 
-       *p_message_type = data[offset] & 0x0f;
-       *p_domain_number = data[offset + 4];
-       *p_sequence_id = (u16)(data[offset + 30]) << 8 | data[offset + 31];
+       *p_message_type  = ptp_get_msgtype(hdr, ptp_class);
+       *p_domain_number = hdr->domain_number;
+       *p_sequence_id   = be16_to_cpu(hdr->sequence_id);
+
        return 0;
 }
 
-- 
2.20.1