mlxsw: Fixes

In this patchset:

- Tx header should be pushed for each packet which is transmitted via Spectrum ASICs. Patch #1 adds a 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.

- Commit b5b60bb491b2 ("mlxsw: pci: Use page pool for Rx buffers allocation") converted mlxsw to use page pool for Rx buffers allocation. Sync for CPU and for device should be done for Rx pages. In patches #2 and #3, add the missing calls to sync pages for, respectively, CPU and the device.

- Patch #4 then fixes a bug to IPv6 GRE forwarding offload. Patch #5 adds a generic forwarding test that fails with mlxsw ports prior to the fix.

Amit Cohen (3):
mlxsw: spectrum_ptp: Add missing verification before pushing Tx header
mlxsw: pci: Sync Rx buffers for CPU
mlxsw: pci: Sync Rx buffers for device

Ido Schimmel (2):
mlxsw: spectrum_ipip: Fix memory leak when changing remote IPv6
address
selftests: forwarding: Add IPv6 GRE remote change tests

 drivers/net/ethernet/mellanox/mlxsw/pci.c     | 25 ++++--
 .../ethernet/mellanox/mlxsw/spectrum_ipip.c   | 26 +++++-
 .../ethernet/mellanox/mlxsw/spectrum_ptp.c    |  7 ++
 .../selftests/net/forwarding/ip6gre_flat.sh   | 14 ++++
 .../net/forwarding/ip6gre_flat_key.sh         | 14 ++++
 .../net/forwarding/ip6gre_flat_keys.sh        | 14 ++++
 .../selftests/net/forwarding/ip6gre_hier.sh   | 14 ++++
 .../net/forwarding/ip6gre_hier_key.sh         | 14 ++++
 .../net/forwarding/ip6gre_hier_keys.sh        | 14 ++++
 .../selftests/net/forwarding/ip6gre_lib.sh    | 80 +++++++++++++++++++
 10 files changed, 212 insertions(+), 10 deletions(-)

2.45.0