Commit d67214a2 authored by Sowmini Varadhan's avatar Sowmini Varadhan Committed by David S. Miller

Documentation: RDS: updates for SO_RDS_TRANSPORT socket option

Update the documentation to describe the changes added by
commit 8ba38460 ("net/rds Add getsockopt support for SO_RDS_TRANSPORT")
Acked-by: default avatarSantosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: default avatarSowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5916e2c1
...@@ -85,7 +85,8 @@ Socket Interface ...@@ -85,7 +85,8 @@ Socket Interface
bind(fd, &sockaddr_in, ...) bind(fd, &sockaddr_in, ...)
This binds the socket to a local IP address and port, and a 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, ...) sendmsg(fd, ...)
Sends a message to the indicated recipient. The kernel will Sends a message to the indicated recipient. The kernel will
...@@ -146,6 +147,20 @@ Socket Interface ...@@ -146,6 +147,20 @@ Socket Interface
operation. In this case, it would use RDS_CANCEL_SENT_TO to operation. In this case, it would use RDS_CANCEL_SENT_TO to
nuke any pending messages. 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 RDMA for RDS
============ ============
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