From 02a6a2592e41d27644d647f3bce23598649961bc Mon Sep 17 00:00:00 2001 From: Andy Grover Date: Fri, 17 Jul 2009 13:13:24 +0000 Subject: RDS/IB: Handle connections using RDS 3.0 wire protocol The big differences between RDS 3.0 and 3.1 are protocol-level flow control, and with 3.1 the header is in front of the data. The header always ends up in the header buffer, and the data goes in the data page. In 3.0 our "header" is a trailer, and will end up either in the data page, the header buffer, or split across the two. Since 3.1 is backwards- compatible with 3.0, we need to continue to support these cases. This patch does that -- if using RDS 3.0 wire protocol, it will copy the header from wherever it ended up into the header buffer. Signed-off-by: Andy Grover Signed-off-by: David S. Miller --- net/rds/ib_cm.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'net/rds/ib_cm.c') diff --git a/net/rds/ib_cm.c b/net/rds/ib_cm.c index 0964ac533ec8..1eb0c291a0b4 100644 --- a/net/rds/ib_cm.c +++ b/net/rds/ib_cm.c @@ -101,10 +101,13 @@ void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_even if (event->param.conn.private_data_len >= sizeof(*dp)) { dp = event->param.conn.private_data; - rds_ib_set_protocol(conn, + /* make sure it isn't empty data */ + if (dp->dp_protocol_major) { + rds_ib_set_protocol(conn, RDS_PROTOCOL(dp->dp_protocol_major, - dp->dp_protocol_minor)); - rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); + dp->dp_protocol_minor)); + rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); + } } printk(KERN_NOTICE "RDS/IB: connected to %pI4 version %u.%u%s\n", -- cgit v1.2.3