Prepare to receive an RDMA-CM private message when handling a new
connection attempt, and send a similar message as part of connection
acceptance.
Both sides can communicate their various implementation limits.
Implementations that don't support this sideband protocol ignore it.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Reviewed-by: Sagi Grimberg <sagi@xxxxxxxxxxx>
---
net/sunrpc/xprtrdma/svc_rdma_transport.c | 34 ++++++++++++++++++++++++++----
1 file changed, 30 insertions(+), 4 deletions(-)
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index 924271c..f51e98a 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -648,6 +648,21 @@ int svc_rdma_repost_recv(struct svcxprt_rdma *xprt, gfp_t flags)
return ret;
}
+static void
+svc_rdma_parse_connect_private(struct svcxprt_rdma *newxprt,
+ struct rdma_conn_param *param)
+{
+ const struct rpcrdma_connect_private *pmsg = param->private_data;
+
+ if (pmsg &&
+ pmsg->cp_magic == rpcrdma_cmp_magic &&
+ pmsg->cp_version == RPCRDMA_CMP_VERSION) {
+ dprintk("svcrdma: client send_size %u, recv_size %u\n",
+ rpcrdma_decode_buffer_size(pmsg->cp_send_size),
+ rpcrdma_decode_buffer_size(pmsg->cp_recv_size));
+ }
+}
+
/*
* This function handles the CONNECT_REQUEST event on a listening
* endpoint. It is passed the cma_id for the _new_ connection. The context in
@@ -659,7 +674,8 @@ int svc_rdma_repost_recv(struct svcxprt_rdma *xprt, gfp_t flags)
* will call the recvfrom method on the listen xprt which will accept the new
* connection.
*/
-static void handle_connect_req(struct rdma_cm_id *new_cma_id, size_t client_ird)
+static void handle_connect_req(struct rdma_cm_id *new_cma_id,
+ struct rdma_conn_param *param)
{
struct svcxprt_rdma *listen_xprt = new_cma_id->context;
struct svcxprt_rdma *newxprt;
@@ -675,9 +691,10 @@ static void handle_connect_req(struct rdma_cm_id *new_cma_id, size_t client_ird)
new_cma_id->context = newxprt;
dprintk("svcrdma: Creating newxprt=%p, cm_id=%p, listenxprt=%p\n",
newxprt, newxprt->sc_cm_id, listen_xprt);
+ svc_rdma_parse_connect_private(newxprt, param);
/* Save client advertised inbound read limit for use later in accept. */
- newxprt->sc_ord = client_ird;
+ newxprt->sc_ord = param->initiator_depth;
/* Set the local and remote addresses in the transport */
sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr;
@@ -712,8 +729,7 @@ static int rdma_listen_handler(struct rdma_cm_id *cma_id,
dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, "
"event = %s (%d)\n", cma_id, cma_id->context,
rdma_event_msg(event->event), event->event);
- handle_connect_req(cma_id,
- event->param.conn.initiator_depth);
+ handle_connect_req(cma_id, &event->param.conn);
break;
case RDMA_CM_EVENT_ESTABLISHED:
@@ -947,6 +963,7 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
struct svcxprt_rdma *listen_rdma;
struct svcxprt_rdma *newxprt = NULL;
struct rdma_conn_param conn_param;
+ struct rpcrdma_connect_private pmsg;
struct ib_qp_init_attr qp_attr;
struct ib_device *dev;
unsigned int i;
@@ -1100,11 +1117,20 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
/* Swap out the handler */
newxprt->sc_cm_id->event_handler = rdma_cma_handler;
+ /* Construct RDMA-CM private message */
+ pmsg.cp_magic = rpcrdma_cmp_magic;
+ pmsg.cp_version = RPCRDMA_CMP_VERSION;
+ pmsg.cp_flags = 0;
+ pmsg.cp_send_size = pmsg.cp_recv_size =
+ rpcrdma_encode_buffer_size(newxprt->sc_max_req_size);
+
/* Accept Connection */
set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags);
memset(&conn_param, 0, sizeof conn_param);
conn_param.responder_resources = 0;
conn_param.initiator_depth = newxprt->sc_ord;
+ conn_param.private_data = &pmsg;
+ conn_param.private_data_len = sizeof(pmsg);
ret = rdma_accept(newxprt->sc_cm_id, &conn_param);
if (ret) {
dprintk("svcrdma: failed to accept new connection, ret=%d\n",
--
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