43c9fc509f
This patch fixes RDMA/rxe over 802.1q VLAN devices. Without it, I observed the following behavior: a) adding a VLAN device to RXE via rxe_net_add() creates a non-functional RDMA device. This is caused by the logic in enum_all_gids_of_dev_cb() / is_eth_port_of_netdev(), which only considers networks connected to "upper devices" of the configured network device, resulting in an empty set of gids for a VLAN interface that is an "upper device" itself. Later attempts to connect via this rdma device fail in cma_acuire_dev() because no gids can be resolved. b) adding the master device of the VLAN device instead seems to work initially, target addresses via VLAN devices are resolved successfully. But the connection times out because no 802.1q VLAN headers are inserted in the ethernet packets, which are therefore never received. This happens because the RXE layer sends the packets via the master device rather than the VLAN device. The problem could be solved by changing either a) or b). My thinking was that the logic in a) was created deliberately, thus I decided to work on b). It turns out that the information about the VLAN interface for the gid at hand is available in the AV information. My patch converts the RXE code to use this netdev instead of rxe->ndev. With this change, RXE over vlan works on my test system. Signed-off-by: Martin Wilck <mwilck@suse.com> Reviewed-by: Moni Shoua <monis@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.