f1267798c9
The packet is VXLAN packet over IPsec transport mode tunnel which has the following format: [IP1 | ESP | UDP | VXLAN | IP2 | TCP] NVIDIA ConnectX card cannot do checksum offload for two L4 headers. The solution is using the checksum partial offload similar to VXLAN | TCP packet. Hardware calculates IP1, IP2 and TCP checksums and software calculates UDP checksum. However, unlike VXLAN | TCP case, IPsec's mlx5 driver cannot access the inner plaintext IP protocol type. Therefore, inner_ipproto is added in the sec_path structure to provide this information. Also, utilize the skb's csum_start to program L4 inner checksum offset. While at it, remove the call to mlx5e_set_eseg_swp and setup software parser fields directly in mlx5e_ipsec_set_swp. mlx5e_set_eseg_swp is not needed as the two features (GENEVE and IPsec) are different and adding this sharing layer creates unnecessary complexity and affect performance. For the case VXLAN packet over IPsec tunnel mode tunnel, checksum offload is disabled because the hardware does not support checksum offload for three L3 (IP) headers. Signed-off-by: Raed Salem <raeds@nvidia.com> Signed-off-by: Huy Nguyen <huyn@nvidia.com> Cc: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.