md: support bitmaps on RAID10 arrays larger then 2 terabytes

[safe/jmp/linux-2.6] / Documentation / infiniband / ipoib.txt

diff --git a/Documentation/infiniband/ipoib.txt b/Documentation/infiniband/ipoib.txt
index 5c5a4cc..6d40f00 100644 (file)
--- a/Documentation/infiniband/ipoib.txt
+++ b/Documentation/infiniband/ipoib.txt
@@ -1,10 +1,10 @@
 IP OVER INFINIBAND
 
   The ib_ipoib driver is an implementation of the IP over InfiniBand
-  protocol as specified by the latest Internet-Drafts issued by the
-  IETF ipoib working group.  It is a "native" implementation in the
-  sense of setting the interface type to ARPHRD_INFINIBAND and the
-  hardware address length to 20 (earlier proprietary implementations
+  protocol as specified by RFC 4391 and 4392, issued by the IETF ipoib
+  working group.  It is a "native" implementation in the sense of
+  setting the interface type to ARPHRD_INFINIBAND and the hardware
+  address length to 20 (earlier proprietary implementations
   masqueraded to the kernel as ethernet interfaces).
 
 Partitions and P_Keys
@@ -24,6 +24,49 @@ Partitions and P_Keys
   The P_Key for any interface is given by the "pkey" file, and the
   main interface for a subinterface is in "parent."
 
+Datagram vs Connected modes
+
+  The IPoIB driver supports two modes of operation: datagram and
+  connected.  The mode is set and read through an interface's
+  /sys/class/net/<intf name>/mode file.
+
+  In datagram mode, the IB UD (Unreliable Datagram) transport is used
+  and so the interface MTU has is equal to the IB L2 MTU minus the
+  IPoIB encapsulation header (4 bytes).  For example, in a typical IB
+  fabric with a 2K MTU, the IPoIB MTU will be 2048 - 4 = 2044 bytes.
+
+  In connected mode, the IB RC (Reliable Connected) transport is used.
+  Connected mode is to takes advantage of the connected nature of the
+  IB transport and allows an MTU up to the maximal IP packet size of
+  64K, which reduces the number of IP packets needed for handling
+  large UDP datagrams, TCP segments, etc and increases the performance
+  for large messages.
+
+  In connected mode, the interface's UD QP is still used for multicast
+  and communication with peers that don't support connected mode. In
+  this case, RX emulation of ICMP PMTU packets is used to cause the
+  networking stack to use the smaller UD MTU for these neighbours.
+
+Stateless offloads
+
+  If the IB HW supports IPoIB stateless offloads, IPoIB advertises
+  TCP/IP checksum and/or Large Send (LSO) offloading capability to the
+  network stack.
+
+  Large Receive (LRO) offloading is also implemented and may be turned
+  on/off using ethtool calls.  Currently LRO is supported only for
+  checksum offload capable devices.
+
+  Stateless offloads are supported only in datagram mode.  
+
+Interrupt moderation
+
+  If the underlying IB device supports CQ event moderation, one can
+  use ethtool to set interrupt mitigation parameters and thus reduce
+  the overhead incurred by handling interrupts.  The main code path of
+  IPoIB doesn't use events for TX completion signaling so only RX
+  moderation is supported.
+
 Debugging Information
 
   By compiling the IPoIB driver with CONFIG_INFINIBAND_IPOIB_DEBUG set
@@ -51,5 +94,9 @@ Debugging Information
 
 References
 
-  IETF IP over InfiniBand (ipoib) Working Group
-    http://ietf.org/html.charters/ipoib-charter.html
+  Transmission of IP over InfiniBand (IPoIB) (RFC 4391)
+    http://ietf.org/rfc/rfc4391.txt 
+  IP over InfiniBand (IPoIB) Architecture (RFC 4392)
+    http://ietf.org/rfc/rfc4392.txt 
+  IP over InfiniBand: Connected Mode (RFC 4755)
+    http://ietf.org/rfc/rfc4755.txt