IB/srp: Export sgid to sysfs

On an initiator system with multiple IB ports it is not yet possible
to figure out what the originating port of an SRP connection is. Hence
make the source GID available in sysfs.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: David Dillow <dillowda@ornl.gov>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index ebbe01bdd306..62e1f2a1c522 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -1965,6 +1965,14 @@ static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
         return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
 }
 
+static ssize_t show_sgid(struct device *dev, struct device_attribute *attr,
+                         char *buf)
+{
+        struct srp_target_port *target = host_to_target(class_to_shost(dev));
+
+        return sprintf(buf, "%pI6\n", target->path.sgid.raw);
+}
+
 static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
                          char *buf)
 {
@@ -2049,6 +2057,7 @@ static DEVICE_ATTR(id_ext,	    S_IRUGO, show_id_ext,	   NULL);
 static DEVICE_ATTR(ioc_guid,        S_IRUGO, show_ioc_guid,        NULL);
 static DEVICE_ATTR(service_id,      S_IRUGO, show_service_id,      NULL);
 static DEVICE_ATTR(pkey,            S_IRUGO, show_pkey,            NULL);
+static DEVICE_ATTR(sgid,            S_IRUGO, show_sgid,            NULL);
 static DEVICE_ATTR(dgid,            S_IRUGO, show_dgid,            NULL);
 static DEVICE_ATTR(orig_dgid,       S_IRUGO, show_orig_dgid,       NULL);
 static DEVICE_ATTR(req_lim,         S_IRUGO, show_req_lim,         NULL);
@@ -2065,6 +2074,7 @@ static struct device_attribute *srp_host_attrs[] = {
         &dev_attr_ioc_guid,
         &dev_attr_service_id,
         &dev_attr_pkey,
+        &dev_attr_sgid,
         &dev_attr_dgid,
         &dev_attr_orig_dgid,
         &dev_attr_req_lim,