mirror of https://gitee.com/openkylin/linux.git
docs: infiniband: convert docs to ReST and rename to *.rst
The InfiniBand docs are plain text with no markups. So, all we needed to do were to add the title markups and some markup sequences in order to properly parse tables, lists and literal blocks. At its new index.rst, let's add a :orphan: while this is not linked to the main index.rst file, in order to avoid build warnings. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Mauro Carvalho Chehab
Jason Gunthorpe
parent
b417c0879d
commit
97162a1ee8
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@ -1,4 +1,6 @@
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INFINIBAND MIDLAYER LOCKING
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===========================
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InfiniBand Midlayer Locking
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===========================
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This guide is an attempt to make explicit the locking assumptions
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made by the InfiniBand midlayer. It describes the requirements on
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@ -6,45 +8,47 @@ INFINIBAND MIDLAYER LOCKING
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protocols that use the midlayer.
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Sleeping and interrupt context
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==============================
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With the following exceptions, a low-level driver implementation of
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all of the methods in struct ib_device may sleep. The exceptions
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are any methods from the list:
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create_ah
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modify_ah
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query_ah
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destroy_ah
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post_send
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post_recv
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poll_cq
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req_notify_cq
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map_phys_fmr
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- create_ah
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- modify_ah
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- query_ah
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- destroy_ah
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- post_send
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- post_recv
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- poll_cq
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- req_notify_cq
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- map_phys_fmr
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which may not sleep and must be callable from any context.
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The corresponding functions exported to upper level protocol
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consumers:
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ib_create_ah
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ib_modify_ah
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ib_query_ah
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ib_destroy_ah
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ib_post_send
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ib_post_recv
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ib_req_notify_cq
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ib_map_phys_fmr
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- ib_create_ah
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- ib_modify_ah
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- ib_query_ah
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- ib_destroy_ah
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- ib_post_send
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- ib_post_recv
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- ib_req_notify_cq
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- ib_map_phys_fmr
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are therefore safe to call from any context.
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In addition, the function
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ib_dispatch_event
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- ib_dispatch_event
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used by low-level drivers to dispatch asynchronous events through
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the midlayer is also safe to call from any context.
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Reentrancy
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----------
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All of the methods in struct ib_device exported by a low-level
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driver must be fully reentrant. The low-level driver is required to
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@ -62,6 +66,7 @@ Reentrancy
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information between different calls of ib_poll_cq() is not defined.
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Callbacks
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---------
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A low-level driver must not perform a callback directly from the
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same callchain as an ib_device method call. For example, it is not
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@ -74,18 +79,18 @@ Callbacks
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completion event handlers for the same CQ are not called
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simultaneously. The driver must guarantee that only one CQ event
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handler for a given CQ is running at a time. In other words, the
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following situation is not allowed:
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following situation is not allowed::
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CPU1 CPU2
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CPU1 CPU2
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low-level driver ->
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consumer CQ event callback:
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/* ... */
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ib_req_notify_cq(cq, ...);
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low-level driver ->
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/* ... */ consumer CQ event callback:
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/* ... */
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return from CQ event handler
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low-level driver ->
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consumer CQ event callback:
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/* ... */
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ib_req_notify_cq(cq, ...);
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low-level driver ->
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/* ... */ consumer CQ event callback:
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/* ... */
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return from CQ event handler
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The context in which completion event and asynchronous event
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callbacks run is not defined. Depending on the low-level driver, it
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@ -93,6 +98,7 @@ Callbacks
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Upper level protocol consumers may not sleep in a callback.
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Hot-plug
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--------
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A low-level driver announces that a device is ready for use by
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consumers when it calls ib_register_device(), all initialization
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@ -0,0 +1,23 @@
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:orphan:
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==========
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InfiniBand
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==========
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.. toctree::
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:maxdepth: 1
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core_locking
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ipoib
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opa_vnic
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sysfs
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tag_matching
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user_mad
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user_verbs
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.. only:: subproject and html
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Indices
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=======
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* :ref:`genindex`
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@ -1,4 +1,6 @@
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IP OVER INFINIBAND
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==================
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IP over InfiniBand
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==================
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The ib_ipoib driver is an implementation of the IP over InfiniBand
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protocol as specified by RFC 4391 and 4392, issued by the IETF ipoib
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@ -8,16 +10,17 @@ IP OVER INFINIBAND
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masqueraded to the kernel as ethernet interfaces).
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Partitions and P_Keys
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=====================
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When the IPoIB driver is loaded, it creates one interface for each
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port using the P_Key at index 0. To create an interface with a
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different P_Key, write the desired P_Key into the main interface's
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/sys/class/net/<intf name>/create_child file. For example:
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/sys/class/net/<intf name>/create_child file. For example::
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echo 0x8001 > /sys/class/net/ib0/create_child
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This will create an interface named ib0.8001 with P_Key 0x8001. To
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remove a subinterface, use the "delete_child" file:
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remove a subinterface, use the "delete_child" file::
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echo 0x8001 > /sys/class/net/ib0/delete_child
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@ -28,6 +31,7 @@ Partitions and P_Keys
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rtnl_link_ops, where children created using either way behave the same.
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Datagram vs Connected modes
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===========================
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The IPoIB driver supports two modes of operation: datagram and
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connected. The mode is set and read through an interface's
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@ -51,6 +55,7 @@ Datagram vs Connected modes
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networking stack to use the smaller UD MTU for these neighbours.
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Stateless offloads
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==================
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If the IB HW supports IPoIB stateless offloads, IPoIB advertises
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TCP/IP checksum and/or Large Send (LSO) offloading capability to the
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@ -60,9 +65,10 @@ Stateless offloads
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on/off using ethtool calls. Currently LRO is supported only for
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checksum offload capable devices.
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Stateless offloads are supported only in datagram mode.
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Stateless offloads are supported only in datagram mode.
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Interrupt moderation
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====================
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If the underlying IB device supports CQ event moderation, one can
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use ethtool to set interrupt mitigation parameters and thus reduce
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@ -71,6 +77,7 @@ Interrupt moderation
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moderation is supported.
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Debugging Information
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=====================
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By compiling the IPoIB driver with CONFIG_INFINIBAND_IPOIB_DEBUG set
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to 'y', tracing messages are compiled into the driver. They are
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@ -79,7 +86,7 @@ Debugging Information
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runtime through files in /sys/module/ib_ipoib/.
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CONFIG_INFINIBAND_IPOIB_DEBUG also enables files in the debugfs
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virtual filesystem. By mounting this filesystem, for example with
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virtual filesystem. By mounting this filesystem, for example with::
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mount -t debugfs none /sys/kernel/debug
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@ -96,10 +103,13 @@ Debugging Information
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performance, because it adds tests to the fast path.
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References
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==========
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Transmission of IP over InfiniBand (IPoIB) (RFC 4391)
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http://ietf.org/rfc/rfc4391.txt
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http://ietf.org/rfc/rfc4391.txt
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IP over InfiniBand (IPoIB) Architecture (RFC 4392)
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http://ietf.org/rfc/rfc4392.txt
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http://ietf.org/rfc/rfc4392.txt
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IP over InfiniBand: Connected Mode (RFC 4755)
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http://ietf.org/rfc/rfc4755.txt
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@ -1,3 +1,7 @@
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=================================================================
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Intel Omni-Path (OPA) Virtual Network Interface Controller (VNIC)
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=================================================================
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Intel Omni-Path (OPA) Virtual Network Interface Controller (VNIC) feature
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supports Ethernet functionality over Omni-Path fabric by encapsulating
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the Ethernet packets between HFI nodes.
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@ -17,70 +21,72 @@ an independent Ethernet network. The configuration is performed by an
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Ethernet Manager (EM) which is part of the trusted Fabric Manager (FM)
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application. HFI nodes can have multiple VNICs each connected to a
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different virtual Ethernet switch. The below diagram presents a case
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of two virtual Ethernet switches with two HFI nodes.
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of two virtual Ethernet switches with two HFI nodes::
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+-------------------+
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| Subnet/ |
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| Ethernet |
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| Manager |
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+-------------------+
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/ /
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/ /
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/ /
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/ /
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+-----------------------------+ +------------------------------+
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| Virtual Ethernet Switch | | Virtual Ethernet Switch |
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| +---------+ +---------+ | | +---------+ +---------+ |
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| | VPORT | | VPORT | | | | VPORT | | VPORT | |
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+--+---------+----+---------+-+ +-+---------+----+---------+---+
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| \ / |
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| \ / |
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| \/ |
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| / \ |
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| / \ |
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+-----------+------------+ +-----------+------------+
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| VNIC | VNIC | | VNIC | VNIC |
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+-----------+------------+ +-----------+------------+
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| HFI | | HFI |
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+------------------------+ +------------------------+
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+-------------------+
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| Subnet/ |
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| Ethernet |
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| Manager |
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+-------------------+
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/ /
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/ /
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/ /
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/ /
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+-----------------------------+ +------------------------------+
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| Virtual Ethernet Switch | | Virtual Ethernet Switch |
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| +---------+ +---------+ | | +---------+ +---------+ |
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| | VPORT | | VPORT | | | | VPORT | | VPORT | |
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+--+---------+----+---------+-+ +-+---------+----+---------+---+
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| \ / |
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| \ / |
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| \/ |
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| / \ |
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| / \ |
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+-----------+------------+ +-----------+------------+
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| VNIC | VNIC | | VNIC | VNIC |
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+-----------+------------+ +-----------+------------+
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| HFI | | HFI |
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+------------------------+ +------------------------+
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The Omni-Path encapsulated Ethernet packet format is as described below.
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Bits Field
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------------------------------------
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==================== ================================
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Bits Field
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==================== ================================
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Quad Word 0:
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0-19 SLID (lower 20 bits)
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20-30 Length (in Quad Words)
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31 BECN bit
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32-51 DLID (lower 20 bits)
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52-56 SC (Service Class)
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57-59 RC (Routing Control)
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60 FECN bit
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61-62 L2 (=10, 16B format)
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63 LT (=1, Link Transfer Head Flit)
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0-19 SLID (lower 20 bits)
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20-30 Length (in Quad Words)
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31 BECN bit
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32-51 DLID (lower 20 bits)
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52-56 SC (Service Class)
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57-59 RC (Routing Control)
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60 FECN bit
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61-62 L2 (=10, 16B format)
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63 LT (=1, Link Transfer Head Flit)
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Quad Word 1:
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0-7 L4 type (=0x78 ETHERNET)
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8-11 SLID[23:20]
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12-15 DLID[23:20]
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16-31 PKEY
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32-47 Entropy
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48-63 Reserved
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0-7 L4 type (=0x78 ETHERNET)
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8-11 SLID[23:20]
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12-15 DLID[23:20]
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16-31 PKEY
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32-47 Entropy
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48-63 Reserved
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Quad Word 2:
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0-15 Reserved
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16-31 L4 header
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32-63 Ethernet Packet
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0-15 Reserved
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16-31 L4 header
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32-63 Ethernet Packet
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Quad Words 3 to N-1:
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0-63 Ethernet packet (pad extended)
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0-63 Ethernet packet (pad extended)
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Quad Word N (last):
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0-23 Ethernet packet (pad extended)
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24-55 ICRC
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56-61 Tail
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62-63 LT (=01, Link Transfer Tail Flit)
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0-23 Ethernet packet (pad extended)
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24-55 ICRC
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56-61 Tail
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62-63 LT (=01, Link Transfer Tail Flit)
|
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==================== ================================
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|
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Ethernet packet is padded on the transmit side to ensure that the VNIC OPA
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packet is quad word aligned. The 'Tail' field contains the number of bytes
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|
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@ -123,7 +129,7 @@ operation. It also handles the encapsulation of Ethernet packets with an
|
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Omni-Path header in the transmit path. For each VNIC interface, the
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information required for encapsulation is configured by the EM via VEMA MAD
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interface. It also passes any control information to the HW dependent driver
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by invoking the RDMA netdev control operations.
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by invoking the RDMA netdev control operations::
|
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|
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+-------------------+ +----------------------+
|
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| | | Linux |
|
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|
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@ -1,4 +1,6 @@
|
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SYSFS FILES
|
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===========
|
||||
Sysfs files
|
||||
===========
|
||||
|
||||
The sysfs interface has moved to
|
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Documentation/ABI/stable/sysfs-class-infiniband.
|
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|
|
@ -1,12 +1,16 @@
|
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==================
|
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Tag matching logic
|
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==================
|
||||
|
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The MPI standard defines a set of rules, known as tag-matching, for matching
|
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source send operations to destination receives. The following parameters must
|
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match the following source and destination parameters:
|
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|
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* Communicator
|
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* User tag - wild card may be specified by the receiver
|
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* Source rank – wild car may be specified by the receiver
|
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* Destination rank – wild
|
||||
|
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The ordering rules require that when more than one pair of send and receive
|
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message envelopes may match, the pair that includes the earliest posted-send
|
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and the earliest posted-receive is the pair that must be used to satisfy the
|
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|
|
@ -35,6 +39,7 @@ the header to initiate an RDMA READ operation directly to the matching buffer.
|
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A fin message needs to be received in order for the buffer to be reused.
|
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|
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Tag matching implementation
|
||||
===========================
|
||||
|
||||
There are two types of matching objects used, the posted receive list and the
|
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unexpected message list. The application posts receive buffers through calls
|
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|
|
@ -1,6 +1,9 @@
|
|||
USERSPACE MAD ACCESS
|
||||
====================
|
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Userspace MAD access
|
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====================
|
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|
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Device files
|
||||
============
|
||||
|
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Each port of each InfiniBand device has a "umad" device and an
|
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"issm" device attached. For example, a two-port HCA will have two
|
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|
|
@ -8,12 +11,13 @@ Device files
|
|||
device of each type (for switch port 0).
|
||||
|
||||
Creating MAD agents
|
||||
===================
|
||||
|
||||
A MAD agent can be created by filling in a struct ib_user_mad_reg_req
|
||||
and then calling the IB_USER_MAD_REGISTER_AGENT ioctl on a file
|
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descriptor for the appropriate device file. If the registration
|
||||
request succeeds, a 32-bit id will be returned in the structure.
|
||||
For example:
|
||||
For example::
|
||||
|
||||
struct ib_user_mad_reg_req req = { /* ... */ };
|
||||
ret = ioctl(fd, IB_USER_MAD_REGISTER_AGENT, (char *) &req);
|
||||
|
|
@ -26,12 +30,14 @@ Creating MAD agents
|
|||
ioctl. Also, all agents registered through a file descriptor will
|
||||
be unregistered when the descriptor is closed.
|
||||
|
||||
2014 -- a new registration ioctl is now provided which allows additional
|
||||
2014
|
||||
a new registration ioctl is now provided which allows additional
|
||||
fields to be provided during registration.
|
||||
Users of this registration call are implicitly setting the use of
|
||||
pkey_index (see below).
|
||||
|
||||
Receiving MADs
|
||||
==============
|
||||
|
||||
MADs are received using read(). The receive side now supports
|
||||
RMPP. The buffer passed to read() must be at least one
|
||||
|
|
@ -41,7 +47,8 @@ Receiving MADs
|
|||
MAD (RMPP), the errno is set to ENOSPC and the length of the
|
||||
buffer needed is set in mad.length.
|
||||
|
||||
Example for normal MAD (non RMPP) reads:
|
||||
Example for normal MAD (non RMPP) reads::
|
||||
|
||||
struct ib_user_mad *mad;
|
||||
mad = malloc(sizeof *mad + 256);
|
||||
ret = read(fd, mad, sizeof *mad + 256);
|
||||
|
|
@ -50,7 +57,8 @@ Receiving MADs
|
|||
free(mad);
|
||||
}
|
||||
|
||||
Example for RMPP reads:
|
||||
Example for RMPP reads::
|
||||
|
||||
struct ib_user_mad *mad;
|
||||
mad = malloc(sizeof *mad + 256);
|
||||
ret = read(fd, mad, sizeof *mad + 256);
|
||||
|
|
@ -76,11 +84,12 @@ Receiving MADs
|
|||
poll()/select() may be used to wait until a MAD can be read.
|
||||
|
||||
Sending MADs
|
||||
============
|
||||
|
||||
MADs are sent using write(). The agent ID for sending should be
|
||||
filled into the id field of the MAD, the destination LID should be
|
||||
filled into the lid field, and so on. The send side does support
|
||||
RMPP so arbitrary length MAD can be sent. For example:
|
||||
RMPP so arbitrary length MAD can be sent. For example::
|
||||
|
||||
struct ib_user_mad *mad;
|
||||
|
||||
|
|
@ -97,6 +106,7 @@ Sending MADs
|
|||
perror("write");
|
||||
|
||||
Transaction IDs
|
||||
===============
|
||||
|
||||
Users of the umad devices can use the lower 32 bits of the
|
||||
transaction ID field (that is, the least significant half of the
|
||||
|
|
@ -105,6 +115,7 @@ Transaction IDs
|
|||
the kernel and will be overwritten before a MAD is sent.
|
||||
|
||||
P_Key Index Handling
|
||||
====================
|
||||
|
||||
The old ib_umad interface did not allow setting the P_Key index for
|
||||
MADs that are sent and did not provide a way for obtaining the P_Key
|
||||
|
|
@ -119,6 +130,7 @@ P_Key Index Handling
|
|||
default, and the IB_USER_MAD_ENABLE_PKEY ioctl will be removed.
|
||||
|
||||
Setting IsSM Capability Bit
|
||||
===========================
|
||||
|
||||
To set the IsSM capability bit for a port, simply open the
|
||||
corresponding issm device file. If the IsSM bit is already set,
|
||||
|
|
@ -129,25 +141,26 @@ Setting IsSM Capability Bit
|
|||
the issm file.
|
||||
|
||||
/dev files
|
||||
==========
|
||||
|
||||
To create the appropriate character device files automatically with
|
||||
udev, a rule like
|
||||
udev, a rule like::
|
||||
|
||||
KERNEL=="umad*", NAME="infiniband/%k"
|
||||
KERNEL=="issm*", NAME="infiniband/%k"
|
||||
|
||||
can be used. This will create device nodes named
|
||||
can be used. This will create device nodes named::
|
||||
|
||||
/dev/infiniband/umad0
|
||||
/dev/infiniband/issm0
|
||||
|
||||
for the first port, and so on. The InfiniBand device and port
|
||||
associated with these devices can be determined from the files
|
||||
associated with these devices can be determined from the files::
|
||||
|
||||
/sys/class/infiniband_mad/umad0/ibdev
|
||||
/sys/class/infiniband_mad/umad0/port
|
||||
|
||||
and
|
||||
and::
|
||||
|
||||
/sys/class/infiniband_mad/issm0/ibdev
|
||||
/sys/class/infiniband_mad/issm0/port
|
||||
|
|
@ -1,4 +1,6 @@
|
|||
USERSPACE VERBS ACCESS
|
||||
======================
|
||||
Userspace verbs access
|
||||
======================
|
||||
|
||||
The ib_uverbs module, built by enabling CONFIG_INFINIBAND_USER_VERBS,
|
||||
enables direct userspace access to IB hardware via "verbs," as
|
||||
|
|
@ -13,6 +15,7 @@ USERSPACE VERBS ACCESS
|
|||
libmthca userspace driver be installed.
|
||||
|
||||
User-kernel communication
|
||||
=========================
|
||||
|
||||
Userspace communicates with the kernel for slow path, resource
|
||||
management operations via the /dev/infiniband/uverbsN character
|
||||
|
|
@ -28,6 +31,7 @@ User-kernel communication
|
|||
system call.
|
||||
|
||||
Resource management
|
||||
===================
|
||||
|
||||
Since creation and destruction of all IB resources is done by
|
||||
commands passed through a file descriptor, the kernel can keep track
|
||||
|
|
@ -41,6 +45,7 @@ Resource management
|
|||
prevent one process from touching another process's resources.
|
||||
|
||||
Memory pinning
|
||||
==============
|
||||
|
||||
Direct userspace I/O requires that memory regions that are potential
|
||||
I/O targets be kept resident at the same physical address. The
|
||||
|
|
@ -54,13 +59,14 @@ Memory pinning
|
|||
number of pages pinned by a process.
|
||||
|
||||
/dev files
|
||||
==========
|
||||
|
||||
To create the appropriate character device files automatically with
|
||||
udev, a rule like
|
||||
udev, a rule like::
|
||||
|
||||
KERNEL=="uverbs*", NAME="infiniband/%k"
|
||||
|
||||
can be used. This will create device nodes named
|
||||
can be used. This will create device nodes named::
|
||||
|
||||
/dev/infiniband/uverbs0
|
||||
|
||||
|
|
@ -745,7 +745,7 @@ static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
|
|||
"process %s did not enable P_Key index support.\n",
|
||||
current->comm);
|
||||
dev_warn(&file->port->dev,
|
||||
" Documentation/infiniband/user_mad.txt has info on the new ABI.\n");
|
||||
" Documentation/infiniband/user_mad.rst has info on the new ABI.\n");
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -6,7 +6,7 @@ config INFINIBAND_IPOIB
|
|||
transports IP packets over InfiniBand so you can use your IB
|
||||
device as a fancy NIC.
|
||||
|
||||
See Documentation/infiniband/ipoib.txt for more information
|
||||
See Documentation/infiniband/ipoib.rst for more information
|
||||
|
||||
config INFINIBAND_IPOIB_CM
|
||||
bool "IP-over-InfiniBand Connected Mode support"
|
||||
|
|
|
|||
Loading…
Reference in New Issue