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authorSowmini Varadhan <sowmini.varadhan@oracle.com>2016-07-14 03:51:04 -0700
committerDavid S. Miller <davem@davemloft.net>2016-07-15 11:36:58 -0700
commitd67214a29bc8be3216849215aa4fdca057bd8119 (patch)
tree2a02e645b68e47e6a74028b132f3afe7051ed5b5 /Documentation/networking
parent5916e2c1554f3e36f770401c989c3c7fadf619ca (diff)
Documentation: RDS: updates for SO_RDS_TRANSPORT socket option
Update the documentation to describe the changes added by commit 8ba38460f363 ("net/rds Add getsockopt support for SO_RDS_TRANSPORT") Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com> Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking')
-rw-r--r--Documentation/networking/rds.txt17
1 files changed, 16 insertions, 1 deletions
diff --git a/Documentation/networking/rds.txt b/Documentation/networking/rds.txt
index 9d219d856d46..1366e1114d55 100644
--- a/Documentation/networking/rds.txt
+++ b/Documentation/networking/rds.txt
@@ -85,7 +85,8 @@ Socket Interface
bind(fd, &sockaddr_in, ...)
This binds the socket to a local IP address and port, and a
- transport.
+ transport, if one has not already been selected via the
+ SO_RDS_TRANSPORT socket option
sendmsg(fd, ...)
Sends a message to the indicated recipient. The kernel will
@@ -146,6 +147,20 @@ Socket Interface
operation. In this case, it would use RDS_CANCEL_SENT_TO to
nuke any pending messages.
+ setsockopt(fd, SOL_RDS, SO_RDS_TRANSPORT, (int *)&transport ..)
+ getsockopt(fd, SOL_RDS, SO_RDS_TRANSPORT, (int *)&transport ..)
+ Set or read an integer defining the underlying
+ encapsulating transport to be used for RDS packets on the
+ socket. When setting the option, integer argument may be
+ one of RDS_TRANS_TCP or RDS_TRANS_IB. When retrieving the
+ value, RDS_TRANS_NONE will be returned on an unbound socket.
+ This socket option may only be set exactly once on the socket,
+ prior to binding it via the bind(2) system call. Attempts to
+ set SO_RDS_TRANSPORT on a socket for which the transport has
+ been previously attached explicitly (by SO_RDS_TRANSPORT) or
+ implicitly (via bind(2)) will return an error of EOPNOTSUPP.
+ An attempt to set SO_RDS_TRANSPPORT to RDS_TRANS_NONE will
+ always return EINVAL.
RDMA for RDS
============