mlxsw: spectrum_ptp: Add missing verification before pushing Tx header

[ Upstream commit 0a66e558 ]

Tx header should be pushed for each packet which is transmitted via
Spectrum ASICs. The cited commit moved the call to skb_cow_head() from
mlxsw_sp_port_xmit() to functions which handle Tx header.

In case that mlxsw_sp->ptp_ops->txhdr_construct() is used to handle Tx
header, and txhdr_construct() is mlxsw_sp_ptp_txhdr_construct(), there is
no call for skb_cow_head() before pushing Tx header size to SKB. This flow
is relevant for Spectrum-1 and Spectrum-4, for PTP packets.

Add the missing call to skb_cow_head() to make sure that there is both
enough room to push the Tx header and that the SKB header is not cloned and
can be modified.

An additional set will be sent to net-next to centralize the handling of
the Tx header by pushing it to every packet just before transmission.

Cc: Richard Cochran <richardcochran@gmail.com>
Fixes: 24157bc6 ("mlxsw: Send PTP packets as data packets to overcome a limitation")
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Link: https://patch.msgid.link/5145780b07ebbb5d3b3570f311254a3a2d554a44.1729866134.git.petrm@nvidia.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>