[PATCH rdma-next 6/9] RDMA/ucma: Deliver ECE parameters through UCMA events

[Leon Romanovsky <leon@kernel.org>]

From: Leon Romanovsky <leonro@mellanox.com>

Passive side of CMID connection receives ECE request through
REQ message and needs to respond with relevant REP message which
will be forwarded to active side.

The UCMA events interface is responsible for such communication
with the user space (librdmacm). Extend it to provide ECE wire
data.

Reviewed-by: Mark Zhang <markz@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
---
 drivers/infiniband/core/ucma.c | 6 +++++-
 include/rdma/rdma_cm.h         | 1 +
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index c06394350fed..d2aeb23e6a3c 100644
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -360,6 +360,9 @@ static int ucma_event_handler(struct rdma_cm_id *cm_id,
 		ucma_copy_conn_event(&uevent->resp.param.conn,
 				     &event->param.conn);

+	uevent->resp.ece.vendor_id = event->ece.vendor_id;
+	uevent->resp.ece.attr_mod = event->ece.attr_mod;
+
 	if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
 		if (!ctx->backlog) {
 			ret = -ENOMEM;
@@ -404,7 +407,8 @@ static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
 	 * Old 32 bit user space does not send the 4 byte padding in the
 	 * reserved field. We don't care, allow it to keep working.
 	 */
-	if (out_len < sizeof(uevent->resp) - sizeof(uevent->resp.reserved))
+	if (out_len < sizeof(uevent->resp) - sizeof(uevent->resp.reserved) -
+			      sizeof(uevent->resp.ece))
 		return -ENOSPC;

 	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
diff --git a/include/rdma/rdma_cm.h b/include/rdma/rdma_cm.h
index 86a849214c84..761168c41848 100644
--- a/include/rdma/rdma_cm.h
+++ b/include/rdma/rdma_cm.h
@@ -111,6 +111,7 @@ struct rdma_cm_event {
 		struct rdma_conn_param	conn;
 		struct rdma_ud_param	ud;
 	} param;
+	struct rdma_ucm_ece ece;
 };

 struct rdma_cm_id;
--
2.24.1