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authorSowmini Varadhan <sowmini.varadhan@oracle.com>2015-05-29 17:28:08 -0400
committerDavid S. Miller <davem@davemloft.net>2015-05-31 21:47:23 -0700
commitd97dac54bf83b2a3df85fba37595e355627e0f2b (patch)
tree7a28dad3c812ffa56b8001ee1759c6493a30d3e0 /net/rds/transport.c
parenta28c257c9eb0bd76a4adcac97c07e34044ec71fb (diff)
downloadlinux-d97dac54bf83b2a3df85fba37595e355627e0f2b.tar.gz
net/rds: Add setsockopt support for SO_RDS_TRANSPORT
An application may deterministically attach the underlying transport for a PF_RDS socket by invoking setsockopt(2) with the SO_RDS_TRANSPORT option at the SOL_RDS level. The integer argument to setsockopt must be one of the RDS_TRANS_* transport types, e.g., RDS_TRANS_TCP. The option must be specified before invoking bind(2) on the socket, and may only be used once on the socket. An attempt to set the option on a bound socket, or to invoke the option after a successful SO_RDS_TRANSPORT attachment, will return EOPNOTSUPP. Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds/transport.c')
-rw-r--r--net/rds/transport.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/net/rds/transport.c b/net/rds/transport.c
index 7f2ac4fec367..8b4a6cd2c3a7 100644
--- a/net/rds/transport.c
+++ b/net/rds/transport.c
@@ -101,6 +101,27 @@ struct rds_transport *rds_trans_get_preferred(__be32 addr)
return ret;
}
+struct rds_transport *rds_trans_get(int t_type)
+{
+ struct rds_transport *ret = NULL;
+ struct rds_transport *trans;
+ unsigned int i;
+
+ down_read(&rds_trans_sem);
+ for (i = 0; i < RDS_TRANS_COUNT; i++) {
+ trans = transports[i];
+
+ if (trans && trans->t_type == t_type &&
+ (!trans->t_owner || try_module_get(trans->t_owner))) {
+ ret = trans;
+ break;
+ }
+ }
+ up_read(&rds_trans_sem);
+
+ return ret;
+}
+
/*
* This returns the number of stats entries in the snapshot and only
* copies them using the iter if there is enough space for them. The