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misc: mic: SCIF messaging and node enumeration APIs

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SCIF messaging APIs which allow sending messages between the SCIF
endpoints via a byte stream based ring buffer which has been
optimized to avoid reads across PCIe. The SCIF messaging APIs
are typically used for short < 1024 byte messages for best
performance while the RDMA APIs which will be submitted in a future
patch series is recommended for larger transfers. The node
enumeration API enables a user to query for the number of nodes
online in the SCIF network and their node ids.

Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Nikhil Rao <nikhil.rao@intel.com>
Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sudeep Dutt
2015-04-29 05:32:37 -07:00
committed by Greg Kroah-Hartman
parent 76371c7c0d
commit fdd9fd5c38
6 changed files with 583 additions and 1 deletions
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17
drivers/misc/mic/scif/scif_nm.c
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@@ -218,3 +218,20 @@ void scif_disconnect_node(u32 node_id, bool mgmt_initiated)
(atomic_read(&scifdev->disconn_rescnt) == 1),
SCIF_NODE_ALIVE_TIMEOUT);
}
void scif_get_node_info(void)
{
struct scifmsg msg;
DECLARE_COMPLETION_ONSTACK(node_info);
msg.uop = SCIF_GET_NODE_INFO;
msg.src.node = scif_info.nodeid;
msg.dst.node = SCIF_MGMT_NODE;
msg.payload[3] = (u64)&node_info;
if ((scif_nodeqp_send(&scif_dev[SCIF_MGMT_NODE], &msg)))
return;
/* Wait for a response with SCIF_GET_NODE_INFO */
wait_for_completion(&node_info);
}