IB/ipath: Add ability to set the LMC via the sysfs debugging interface

This patch adds the ability to set the LMC via a sysfs file as if the SM
sent a SubnSet(PortInfo) MAD.  It is useful for debugging when no SM is
running.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 39 insertions, 1 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_sysfs.c b/drivers/infiniband/hw/ipath/ipath_sysfs.c
index 16238cd3a036..e1ad7cfc21fd 100644
--- a/drivers/infiniband/hw/ipath/ipath_sysfs.c
+++ b/drivers/infiniband/hw/ipath/ipath_sysfs.c
@@ -163,6 +163,42 @@ static ssize_t show_boardversion(struct device *dev,
         return scnprintf(buf, PAGE_SIZE, "%s", dd->ipath_boardversion);
 }
 
+static ssize_t show_lmc(struct device *dev,
+                        struct device_attribute *attr,
+                        char *buf)
+{
+        struct ipath_devdata *dd = dev_get_drvdata(dev);
+
+        return scnprintf(buf, PAGE_SIZE, "%u\n", dd->ipath_lmc);
+}
+
+static ssize_t store_lmc(struct device *dev,
+                         struct device_attribute *attr,
+                         const char *buf,
+                         size_t count)
+{
+        struct ipath_devdata *dd = dev_get_drvdata(dev);
+        u16 lmc = 0;
+        int ret;
+
+        ret = ipath_parse_ushort(buf, &lmc);
+        if (ret < 0)
+                goto invalid;
+
+        if (lmc > 7) {
+                ret = -EINVAL;
+                goto invalid;
+        }
+
+        ipath_set_lid(dd, dd->ipath_lid, lmc);
+
+        goto bail;
+invalid:
+        ipath_dev_err(dd, "attempt to set invalid LMC %u\n", lmc);
+bail:
+        return ret;
+}
+
 static ssize_t show_lid(struct device *dev,
                         struct device_attribute *attr,
                         char *buf)
@@ -190,7 +226,7 @@ static ssize_t store_lid(struct device *dev,
                 goto invalid;
         }
 
-        ipath_set_lid(dd, lid, 0);
+        ipath_set_lid(dd, lid, dd->ipath_lmc);
 
         goto bail;
 invalid:
@@ -648,6 +684,7 @@ static struct attribute_group driver_attr_group = {
 };
 
 static DEVICE_ATTR(guid, S_IWUSR | S_IRUGO, show_guid, store_guid);
+static DEVICE_ATTR(lmc, S_IWUSR | S_IRUGO, show_lmc, store_lmc);
 static DEVICE_ATTR(lid, S_IWUSR | S_IRUGO, show_lid, store_lid);
 static DEVICE_ATTR(link_state, S_IWUSR, NULL, store_link_state);
 static DEVICE_ATTR(mlid, S_IWUSR | S_IRUGO, show_mlid, store_mlid);
@@ -667,6 +704,7 @@ static DEVICE_ATTR(logged_errors, S_IRUGO, show_logged_errs, NULL);
 
 static struct attribute *dev_attributes[] = {
         &dev_attr_guid.attr,
+        &dev_attr_lmc.attr,
         &dev_attr_lid.attr,
         &dev_attr_link_state.attr,
         &dev_attr_mlid.attr,