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, 120 insertions, 0 deletions

diff --git a/drivers/infiniband/core/sysfs.c b/drivers/infiniband/core/sysfs.c
index 36a0ef97c6a5..4d1042115598 100644
--- a/drivers/infiniband/core/sysfs.c
+++ b/drivers/infiniband/core/sysfs.c
@@ -663,6 +663,120 @@ static struct class ib_class = {
         .dev_uevent = ib_device_uevent,
 };
 
+/* Show a given an attribute in the statistics group */
+static ssize_t show_protocol_stat(const struct device *device,
+                            struct device_attribute *attr, char *buf,
+                            unsigned offset)
+{
+        struct ib_device *dev = container_of(device, struct ib_device, dev);
+        union rdma_protocol_stats stats;
+        ssize_t ret;
+
+        ret = dev->get_protocol_stats(dev, &stats);
+        if (ret)
+                return ret;
+
+        return sprintf(buf, "%llu\n",
+                       (unsigned long long) ((u64 *) &stats)[offset]);
+}
+
+/* generate a read-only iwarp statistics attribute */
+#define IW_STATS_ENTRY(name)                                            \
+static ssize_t show_##name(struct device *device,                       \
+                           struct device_attribute *attr, char *buf)    \
+{                                                                       \
+        return show_protocol_stat(device, attr, buf,                    \
+                                  offsetof(struct iw_protocol_stats, name) / \
+                                  sizeof (u64));                        \
+}                                                                       \
+static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
+
+IW_STATS_ENTRY(ipInReceives);
+IW_STATS_ENTRY(ipInHdrErrors);
+IW_STATS_ENTRY(ipInTooBigErrors);
+IW_STATS_ENTRY(ipInNoRoutes);
+IW_STATS_ENTRY(ipInAddrErrors);
+IW_STATS_ENTRY(ipInUnknownProtos);
+IW_STATS_ENTRY(ipInTruncatedPkts);
+IW_STATS_ENTRY(ipInDiscards);
+IW_STATS_ENTRY(ipInDelivers);
+IW_STATS_ENTRY(ipOutForwDatagrams);
+IW_STATS_ENTRY(ipOutRequests);
+IW_STATS_ENTRY(ipOutDiscards);
+IW_STATS_ENTRY(ipOutNoRoutes);
+IW_STATS_ENTRY(ipReasmTimeout);
+IW_STATS_ENTRY(ipReasmReqds);
+IW_STATS_ENTRY(ipReasmOKs);
+IW_STATS_ENTRY(ipReasmFails);
+IW_STATS_ENTRY(ipFragOKs);
+IW_STATS_ENTRY(ipFragFails);
+IW_STATS_ENTRY(ipFragCreates);
+IW_STATS_ENTRY(ipInMcastPkts);
+IW_STATS_ENTRY(ipOutMcastPkts);
+IW_STATS_ENTRY(ipInBcastPkts);
+IW_STATS_ENTRY(ipOutBcastPkts);
+IW_STATS_ENTRY(tcpRtoAlgorithm);
+IW_STATS_ENTRY(tcpRtoMin);
+IW_STATS_ENTRY(tcpRtoMax);
+IW_STATS_ENTRY(tcpMaxConn);
+IW_STATS_ENTRY(tcpActiveOpens);
+IW_STATS_ENTRY(tcpPassiveOpens);
+IW_STATS_ENTRY(tcpAttemptFails);
+IW_STATS_ENTRY(tcpEstabResets);
+IW_STATS_ENTRY(tcpCurrEstab);
+IW_STATS_ENTRY(tcpInSegs);
+IW_STATS_ENTRY(tcpOutSegs);
+IW_STATS_ENTRY(tcpRetransSegs);
+IW_STATS_ENTRY(tcpInErrs);
+IW_STATS_ENTRY(tcpOutRsts);
+
+static struct attribute *iw_proto_stats_attrs[] = {
+        &dev_attr_ipInReceives.attr,
+        &dev_attr_ipInHdrErrors.attr,
+        &dev_attr_ipInTooBigErrors.attr,
+        &dev_attr_ipInNoRoutes.attr,
+        &dev_attr_ipInAddrErrors.attr,
+        &dev_attr_ipInUnknownProtos.attr,
+        &dev_attr_ipInTruncatedPkts.attr,
+        &dev_attr_ipInDiscards.attr,
+        &dev_attr_ipInDelivers.attr,
+        &dev_attr_ipOutForwDatagrams.attr,
+        &dev_attr_ipOutRequests.attr,
+        &dev_attr_ipOutDiscards.attr,
+        &dev_attr_ipOutNoRoutes.attr,
+        &dev_attr_ipReasmTimeout.attr,
+        &dev_attr_ipReasmReqds.attr,
+        &dev_attr_ipReasmOKs.attr,
+        &dev_attr_ipReasmFails.attr,
+        &dev_attr_ipFragOKs.attr,
+        &dev_attr_ipFragFails.attr,
+        &dev_attr_ipFragCreates.attr,
+        &dev_attr_ipInMcastPkts.attr,
+        &dev_attr_ipOutMcastPkts.attr,
+        &dev_attr_ipInBcastPkts.attr,
+        &dev_attr_ipOutBcastPkts.attr,
+        &dev_attr_tcpRtoAlgorithm.attr,
+        &dev_attr_tcpRtoMin.attr,
+        &dev_attr_tcpRtoMax.attr,
+        &dev_attr_tcpMaxConn.attr,
+        &dev_attr_tcpActiveOpens.attr,
+        &dev_attr_tcpPassiveOpens.attr,
+        &dev_attr_tcpAttemptFails.attr,
+        &dev_attr_tcpEstabResets.attr,
+        &dev_attr_tcpCurrEstab.attr,
+        &dev_attr_tcpInSegs.attr,
+        &dev_attr_tcpOutSegs.attr,
+        &dev_attr_tcpRetransSegs.attr,
+        &dev_attr_tcpInErrs.attr,
+        &dev_attr_tcpOutRsts.attr,
+        NULL
+};
+
+static struct attribute_group iw_stats_group = {
+        .name   = "proto_stats",
+        .attrs  = iw_proto_stats_attrs,
+};
+
 int ib_device_register_sysfs(struct ib_device *device)
 {
         struct device *class_dev = &device->dev;
@@ -705,6 +819,12 @@ int ib_device_register_sysfs(struct ib_device *device)
                 }
         }
 
+        if (device->node_type == RDMA_NODE_RNIC && device->get_protocol_stats) {
+                ret = sysfs_create_group(&class_dev->kobj, &iw_stats_group);
+                if (ret)
+                        goto err_put;
+        }
+
         return 0;
 
 err_put: