Documentation/ABI: update infiniband sysfs interfaces

Add documentation for core and hardware specific infiniband interfaces.
The descriptions have been collected from git commit logs, reading
through code and data sheets. Some drivers have incomplete doc and are
annotated with the comment '[to be documented]'.
Signed-off-by: Aishwarya Pant <aishpant@gmail.com>
Reviewed-by: Hal Rosenstock <hal@mellanox.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/ABI/testing/sysfs-class-infiniband

-What:		/sys/class/infiniband/<hca>/ports/<port-number>/gid_attrs/ndevs/<gid-index>
-Date:		November 29, 2015
-KernelVersion:	4.4.0
-Contact:	linux-rdma@vger.kernel.org
-Description: 	The net-device's name associated with the GID resides
-		at index <gid-index>.
-
-What:		/sys/class/infiniband/<hca>/ports/<port-number>/gid_attrs/types/<gid-index>
-Date:		November 29, 2015
-KernelVersion:	4.4.0
-Contact:	linux-rdma@vger.kernel.org
-Description: 	The RoCE type of the associated GID resides at index <gid-index>.
-		This could either be "IB/RoCE v1" for IB and RoCE v1 based GODs
-		or "RoCE v2" for RoCE v2 based GIDs.
-
-

Documentation/infiniband/sysfs.txt

 SYSFS FILES
 
-  For each InfiniBand device, the InfiniBand drivers create the
-  following files under /sys/class/infiniband/<device name>:
-
-    node_type      - Node type (CA, switch or router)
-    node_guid      - Node GUID
-    sys_image_guid - System image GUID
-
-  In addition, there is a "ports" subdirectory, with one subdirectory
-  for each port.  For example, if mthca0 is a 2-port HCA, there will
-  be two directories:
-
-    /sys/class/infiniband/mthca0/ports/1
-    /sys/class/infiniband/mthca0/ports/2
-
-  (A switch will only have a single "0" subdirectory for switch port
-  0; no subdirectory is created for normal switch ports)
-
-  In each port subdirectory, the following files are created:
-
-    cap_mask       - Port capability mask
-    lid            - Port LID
-    lid_mask_count - Port LID mask count
-    rate           - Port data rate (active width * active speed)
-    sm_lid         - Subnet manager LID for port's subnet
-    sm_sl          - Subnet manager SL for port's subnet
-    state          - Port state (DOWN, INIT, ARMED, ACTIVE or ACTIVE_DEFER)
-    phys_state     - Port physical state (Sleep, Polling, LinkUp, etc)
-
-  There is also a "counters" subdirectory, with files
-
-    VL15_dropped
-    excessive_buffer_overrun_errors
-    link_downed
-    link_error_recovery
-    local_link_integrity_errors
-    port_rcv_constraint_errors
-    port_rcv_data
-    port_rcv_errors
-    port_rcv_packets
-    port_rcv_remote_physical_errors
-    port_rcv_switch_relay_errors
-    port_xmit_constraint_errors
-    port_xmit_data
-    port_xmit_discards
-    port_xmit_packets
-    symbol_error
-
-  Each of these files contains the corresponding value from the port's
-  Performance Management PortCounters attribute, as described in
-  section 16.1.3.5 of the InfiniBand Architecture Specification.
-
-  The "pkeys" and "gids" subdirectories contain one file for each
-  entry in the port's P_Key or GID table respectively.  For example,
-  ports/1/pkeys/10 contains the value at index 10 in port 1's P_Key
-  table.
-
-  There is an optional "hw_counters" subdirectory that may be under either
-  the parent device or the port subdirectories or both.  If present,
-  there are a list of counters provided by the hardware.  They may match
-  some of the counters in the counters directory, but they often include
-  many other counters.  In addition to the various counters, there will
-  be a file named "lifespan" that configures how frequently the core
-  should update the counters when they are being accessed (counters are
-  not updated if they are not being accessed).  The lifespan is in milli-
-  seconds and defaults to 10 unless set to something else by the driver.
-  Users may echo a value between 0 - 10000 to the lifespan file to set
-  the length of time between updates in milliseconds.
-
-MTHCA
-
-  The Mellanox HCA driver also creates the files:
-
-    hw_rev   - Hardware revision number
-    fw_ver   - Firmware version
-    hca_type - HCA type: "MT23108", "MT25208 (MT23108 compat mode)",
-               or "MT25208"
-
-HFI1
-
-  The hfi1 driver also creates these additional files:
-
-   hw_rev - hardware revision
-   board_id - manufacturing board id
-   tempsense - thermal sense information
-   serial - board serial number
-   nfreectxts - number of free user contexts
-   nctxts - number of allowed contexts (PSM2)
-   chip_reset - diagnostic (root only)
-   boardversion - board version
-
-   sdma<N>/ - one directory per sdma engine (0 - 15)
-	sdma<N>/cpu_list - read-write, list of cpus for user-process to sdma
-			   engine assignment.
-	sdma<N>/vl - read-only, vl the sdma engine maps to.
-
-	The new interface will give the user control on the affinity settings
-	for the hfi1 device.
-	As an example, to set an sdma engine irq affinity and thread affinity
-	of a user processes to use the sdma engine, which is "near" in terms
-	of NUMA configuration, or physical cpu location, the user will do:
-
-	echo "3" > /proc/irq/<N>/smp_affinity_list
-	echo "4-7" > /sys/devices/.../sdma3/cpu_list
-	cat /sys/devices/.../sdma3/vl
-	0
-	echo "8" > /proc/irq/<M>/smp_affinity_list
-	echo "9-12" > /sys/devices/.../sdma4/cpu_list
-	cat /sys/devices/.../sdma4/vl
-	1
-
-	to make sure that when a process runs on cpus 4,5,6, or 7,
-	and uses vl=0, then sdma engine 3 is selected by the driver,
-	and also the interrupt of the sdma engine 3 is steered to cpu 3.
-	Similarly, when a process runs on cpus 9,10,11, or 12 and sets vl=1,
-	then engine 4 will be selected and the irq of the sdma engine 4 is
-	steered to cpu 8.
-	This assumes that in the above N is the irq number of "sdma3",
-	and M is irq number of "sdma4" in the /proc/interrupts file.
-
-   ports/1/
-          CCMgtA/
-               cc_settings_bin - CCA tables used by PSM2
-               cc_table_bin
-               cc_prescan - enable prescaning for faster BECN response
-          sc2v/ - 32 files (0 - 31) used to translate sl->vl
-          sl2sc/ - 32 files (0 - 31) used to translate sl->sc
-          vl2mtu/ - 16 (0 - 15) files used to determine MTU for vl
+The sysfs interface has moved to
+Documentation/ABI/stable/sysfs-class-infiniband.