What: /sys/class/rtrs-client Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> Description: When a user of RTRS API creates a new session, a directory entry with the name of that session is created under /sys/class/rtrs-client/<session-name>/ What: /sys/class/rtrs-client/<session-name>/add_path Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> Description: RW, adds a new path (connection) to an existing session. Expected format is the following:: <[source addr,]destination addr> *addr ::= [ ip:<ipv4|ipv6> | gid:<gid> ] What: /sys/class/rtrs-client/<session-name>/max_reconnect_attempts Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> Description: Maximum number reconnect attempts the client should make before giving up after connection breaks unexpectedly. What: /sys/class/rtrs-client/<session-name>/mp_policy Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> Description: Multipath policy specifies which path should be selected on each IO: round-robin (0): select path in per CPU round-robin manner. min-inflight (1): select path with minimum inflights. min-latency (2): select path with minimum latency. What: /sys/class/rtrs-client/<session-name>/paths/ Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> Description: Each path belonging to a given session is listed here by its source and destination address. When a new path is added to a session by writing to the "add_path" entry, a directory <src@dst> is created. What: /sys/class/rtrs-client/<session-name>/paths/<src@dst>/state Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> Description: RO, Contains "connected" if the session is connected to the peer and fully functional. Otherwise the file contains "disconnected" What: /sys/class/rtrs-client/<session-name>/paths/<src@dst>/reconnect Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> Description: Write "1" to the file in order to reconnect the path. Operation is blocking and returns 0 if reconnect was successful. What: /sys/class/rtrs-client/<session-name>/paths/<src@dst>/disconnect Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> Description: Write "1" to the file in order to disconnect the path. Operation blocks until RTRS path is disconnected. What: /sys/class/rtrs-client/<session-name>/paths/<src@dst>/remove_path Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> Description: Write "1" to the file in order to disconnected and remove the path from the session. Operation blocks until the path is disconnected and removed from the session. What: /sys/class/rtrs-client/<session-name>/paths/<src@dst>/hca_name Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> Description: RO, Contains the name of HCA the connection established on. What: /sys/class/rtrs-client/<session-name>/paths/<src@dst>/hca_port Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> Description: RO, Contains the port number of active port traffic is going through. What: /sys/class/rtrs-client/<session-name>/paths/<src@dst>/src_addr Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> Description: RO, Contains the source address of the path What: /sys/class/rtrs-client/<session-name>/paths/<src@dst>/dst_addr Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> Description: RO, Contains the destination address of the path What: /sys/class/rtrs-client/<session-name>/paths/<src@dst>/cur_latency Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> Description: RO, Contains the latency time calculated by the heart-beat messages. Whenever the client sends heart-beat message, it checks the time gap between sending the heart-beat message and receiving the ACK. This value can be changed regularly. What: /sys/class/rtrs-client/<session-name>/paths/<src@dst>/stats/reset_all Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> Description: RW, Read will return usage help, write 0 will clear all the statistics. What: /sys/class/rtrs-client/<session-name>/paths/<src@dst>/stats/cpu_migration Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> Description: RTRS expects that each HCA IRQ is pinned to a separate CPU. If it's not the case, the processing of an I/O response could be processed on a different CPU than where it was originally submitted. This file shows how many interrupts where generated on a non expected CPU. "from:" is the CPU on which the IRQ was expected, but not generated. "to:" is the CPU on which the IRQ was generated, but not expected. What: /sys/class/rtrs-client/<session-name>/paths/<src@dst>/stats/reconnects Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> Description: Contains 2 unsigned int values, the first one records number of successful reconnects in the path lifetime, the second one records number of failed reconnects in the path lifetime. What: /sys/class/rtrs-client/<session-name>/paths/<src@dst>/stats/rdma Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> Description: Contains statistics regarding rdma operations and inflight operations. The output consists of 6 values:: <read-count> <read-total-size> <write-count> \ <write-total-size> <inflights> <failovered>