RDMA/core: Add iWARP protocol statistics attributes in sysfs

This patch adds a sysfs attribute group called "proto_stats" under
/sys/class/infiniband/$device/ and populates this group with protocol
statistics if they exist for a given device.  Currently, only iWARP
stats are defined, but the code is designed to allow InfiniBand
protocol stats if they become available.  These stats are per-device
and more importantly -not- per port.

Details:

- Add union rdma_protocol_stats in ib_verbs.h.  This union allows
  defining transport-specific stats.  Currently only iwarp stats are
  defined.

- Add struct iw_protocol_stats to define the current set of iwarp
  protocol stats.

- Add new ib_device method called get_proto_stats() to return protocol
  statistics.

- Add logic in core/sysfs.c to create iwarp protocol stats attributes
  if the device is an RNIC and has a get_proto_stats() method.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 74c24b908908..10ebaaae0161 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -226,6 +226,57 @@ static inline int ib_width_enum_to_int(enum ib_port_width width)
         }
 }
 
+struct ib_protocol_stats {
+        /* TBD... */
+};
+
+struct iw_protocol_stats {
+        u64     ipInReceives;
+        u64     ipInHdrErrors;
+        u64     ipInTooBigErrors;
+        u64     ipInNoRoutes;
+        u64     ipInAddrErrors;
+        u64     ipInUnknownProtos;
+        u64     ipInTruncatedPkts;
+        u64     ipInDiscards;
+        u64     ipInDelivers;
+        u64     ipOutForwDatagrams;
+        u64     ipOutRequests;
+        u64     ipOutDiscards;
+        u64     ipOutNoRoutes;
+        u64     ipReasmTimeout;
+        u64     ipReasmReqds;
+        u64     ipReasmOKs;
+        u64     ipReasmFails;
+        u64     ipFragOKs;
+        u64     ipFragFails;
+        u64     ipFragCreates;
+        u64     ipInMcastPkts;
+        u64     ipOutMcastPkts;
+        u64     ipInBcastPkts;
+        u64     ipOutBcastPkts;
+
+        u64     tcpRtoAlgorithm;
+        u64     tcpRtoMin;
+        u64     tcpRtoMax;
+        u64     tcpMaxConn;
+        u64     tcpActiveOpens;
+        u64     tcpPassiveOpens;
+        u64     tcpAttemptFails;
+        u64     tcpEstabResets;
+        u64     tcpCurrEstab;
+        u64     tcpInSegs;
+        u64     tcpOutSegs;
+        u64     tcpRetransSegs;
+        u64     tcpInErrs;
+        u64     tcpOutRsts;
+};
+
+union rdma_protocol_stats {
+        struct ib_protocol_stats        ib;
+        struct iw_protocol_stats        iw;
+};
+
 struct ib_port_attr {
         enum ib_port_state      state;
         enum ib_mtu             max_mtu;
@@ -943,6 +994,8 @@ struct ib_device {
 
         struct iw_cm_verbs           *iwcm;
 
+        int                        (*get_protocol_stats)(struct ib_device *device,
+                                                         union rdma_protocol_stats *stats);
         int                        (*query_device)(struct ib_device *device,
                                                    struct ib_device_attr *device_attr);
         int                        (*query_port)(struct ib_device *device,