From d67214a29bc8be3216849215aa4fdca057bd8119 Mon Sep 17 00:00:00 2001 From: Sowmini Varadhan Date: Thu, 14 Jul 2016 03:51:04 -0700 Subject: [PATCH] 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 Signed-off-by: Sowmini Varadhan Signed-off-by: David S. Miller --- Documentation/networking/rds.txt | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) 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 ============ -- 2.20.1