BMC/Intel-BMC/linux.git/net/rds/send.c, branch dev-4.10

RDS: TCP: Track peer's connection generation number

2016-11-17T18:35:18+00:00

The RDS transport has to be able to distinguish between two types of failure events: (a) when the transport fails (e.g., TCP connection reset) but the RDS socket/connection layer on both sides stays the same (b) when the peer's RDS layer itself resets (e.g., due to module reload or machine reboot at the peer) In case (a) both sides must reconnect and continue the RDS messaging without any message loss or disruption to the message sequence numbers, and this is achieved by rds_send_path_reset(). In case (b) we should reset all rds_connection state to the new incarnation of the peer. Examples of state that needs to be reset are next expected rx sequence number from, or messages to be retransmitted to, the new incarnation of the peer. To achieve this, the RDS handshake probe added as part of commit 5916e2c1554f ("RDS: TCP: Enable multipath RDS for TCP") is enhanced so that sender and receiver of the RDS ping-probe will add a generation number as part of the RDS_EXTHDR_GEN_NUM extension header. Each peer stores local and remote generation numbers as part of each rds_connection. Changes in generation number will be detected via incoming handshake probe ping request or response and will allow the receiver to reset rds_connection state. Signed-off-by: Sowmini Varadhan Acked-by: Santosh Shilimkar Signed-off-by: David S. Miller

RDS: TCP: Enable multipath RDS for TCP

2016-07-15T18:36:58+00:00

Use RDS probe-ping to compute how many paths may be used with the peer, and to synchronously start the multiple paths. If mprds is supported, hash outgoing traffic to one of multiple paths in rds_sendmsg() when multipath RDS is supported by the transport. CC: Santosh Shilimkar Signed-off-by: Sowmini Varadhan Acked-by: Santosh Shilimkar Signed-off-by: David S. Miller

RDS: Rework path specific indirections

2016-07-01T20:45:17+00:00

Refactor code to avoid separate indirections for single-path and multipath transports. All transports (both single and mp-capable) will get a pointer to the rds_conn_path, and can trivially derive the rds_connection from the ->cp_conn. Acked-by: Santosh Shilimkar Signed-off-by: Sowmini Varadhan Signed-off-by: David S. Miller

RDS: Update rds_conn_shutdown to work with rds_conn_path

2016-06-15T06:50:44+00:00

This commit changes rds_conn_shutdown to take a rds_conn_path * argument, allowing it to shutdown paths other than c_path[0] for MP-capable transports. Signed-off-by: Sowmini Varadhan Signed-off-by: David S. Miller

RDS: Add rds_conn_path_connect_if_down() for MP-aware callers

2016-06-15T06:50:43+00:00

rds_conn_path_connect_if_down() works on the rds_conn_path that it is passed. Callers who are not t_m_capable may continue calling rds_conn_connect_if_down, which will invoke rds_conn_path_connect_if_down() with the default c_path[0]. Signed-off-by: Sowmini Varadhan Signed-off-by: David S. Miller

RDS: Make rds_send_pong() take a rds_conn_path argument

2016-06-15T06:50:43+00:00

This commit allows rds_send_pong() callers to send back the rds pong message on some path other than c_path[0] by passing in a struct rds_conn_path * argument. It also removes the last dependency on the #defines in rds_single.h from send.c Signed-off-by: Sowmini Varadhan Signed-off-by: David S. Miller

RDS: Extract rds_conn_path from i_conn_path in rds_send_drop_to() for MP-capable transports

2016-06-15T06:50:43+00:00

Explicitly set up rds_conn_path, either from i_conn_path (for MP capable transpots) or as c_path[0], and use this in rds_send_drop_to() Signed-off-by: Sowmini Varadhan Signed-off-by: David S. Miller

RDS: Pass rds_conn_path to rds_send_xmit()

2016-06-15T06:50:43+00:00

Pass a struct rds_conn_path to rds_send_xmit so that MP capable transports can transmit packets on something other than c_path[0]. The eventual goal for MP capable transports is to hash the rds socket to a path based on the bound local address/port, and use this path as the argument to rds_send_xmit() Signed-off-by: Sowmini Varadhan Signed-off-by: David S. Miller

RDS: Make rds_send_queue_rm() rds_conn_path aware

2016-06-15T06:50:42+00:00

Pass the rds_conn_path to rds_send_queue_rm, and use it to initialize the i_conn_path field in struct rds_incoming. This commit also makes rds_send_queue_rm() MP capable, because it now takes locks specific to the rds_conn_path passed in, instead of defaulting to the c_path[0] based defines from rds_single_path.h Signed-off-by: Sowmini Varadhan Signed-off-by: David S. Miller

RDS: Remove stale function rds_send_get_message()

2016-06-15T06:50:42+00:00

The only caller of rds_send_get_message() was rds_iw_send_cq_comp_handler() which was removed as part of commit dcdede0406d3 ("RDS: Drop stale iWARP RDMA transport"), so remove rds_send_get_message() for the same reason. Signed-off-by: Sowmini Varadhan Signed-off-by: David S. Miller