kernel/net/smc/Makefile, branch linux-5.1.y

net/smc: add base infrastructure for SMC-D and ISM

2018-06-30T11:42:25Z

SMC supports two variants: SMC-R and SMC-D. For data transport, SMC-R uses RDMA devices, SMC-D uses so-called Internal Shared Memory (ISM) devices. An ISM device only allows shared memory communication between SMC instances on the same machine. For example, this allows virtual machines on the same host to communicate via SMC without RDMA devices. This patch adds the base infrastructure for SMC-D and ISM devices to the existing SMC code. It contains the following: * ISM driver interface: This interface allows an ISM driver to register ISM devices in SMC. In the process, the driver provides a set of device ops for each device. SMC uses these ops to execute SMC specific operations on or transfer data over the device. * Core SMC-D link group, connection, and buffer support: Link groups, SMC connections and SMC buffers (in smc_core) are extended to support SMC-D. * SMC type checks: Some type checks are added to prevent using SMC-R specific code for SMC-D and vice versa. To actually use SMC-D, additional changes to pnetid, CLC, CDC, etc. are required. These are added in follow-up patches. Signed-off-by: Hans Wippel Signed-off-by: Ursula Braun Suggested-by: Thomas Richter Signed-off-by: David S. Miller

smc: netlink interface for SMC sockets

2017-01-09T21:07:41Z

Support for SMC socket monitoring via netlink sockets of protocol NETLINK_SOCK_DIAG. Signed-off-by: Ursula Braun Signed-off-by: David S. Miller

smc: socket closing and linkgroup cleanup

2017-01-09T21:07:40Z

smc_shutdown() and smc_release() handling delayed linkgroup cleanup for linkgroups without connections Signed-off-by: Ursula Braun Signed-off-by: David S. Miller

smc: receive data from RMBE

2017-01-09T21:07:40Z

move RMBE data into user space buffer and update managing cursors Signed-off-by: Ursula Braun Signed-off-by: David S. Miller

smc: send data (through RDMA)

2017-01-09T21:07:40Z

copy data to kernel send buffer, and trigger RDMA write Signed-off-by: Ursula Braun Signed-off-by: David S. Miller

smc: connection data control (CDC)

2017-01-09T21:07:40Z

send and receive CDC messages (via IB message send and CQE) Signed-off-by: Ursula Braun Signed-off-by: David S. Miller

smc: link layer control (LLC)

2017-01-09T21:07:40Z

send and receive LLC messages CONFIRM_LINK (via IB message send and CQE) Signed-off-by: Ursula Braun Signed-off-by: David S. Miller

smc: work request (WR) base for use by LLC and CDC

2017-01-09T21:07:39Z

The base containers for RDMA transport are work requests and completion queue entries processed through Infiniband verbs: * allocate and initialize these areas * map these areas to DMA * implement the basic communication consisting of work request posting and receival of completion queue events Signed-off-by: Ursula Braun Signed-off-by: David S. Miller

smc: connection and link group creation

2017-01-09T21:07:39Z

* create smc_connection for SMC-sockets * determine suitable link group for a connection * create a new link group if necessary Signed-off-by: Ursula Braun Signed-off-by: David S. Miller

smc: CLC handshake (incl. preparation steps)

2017-01-09T21:07:39Z

* CLC (Connection Layer Control) handshake Signed-off-by: Ursula Braun Signed-off-by: David S. Miller