IB: simplify static rate encoding

Push translation of static rate to HCA format into low-level drivers,
where it belongs.  For static rate encoding, use encoding of rate
field from IB standard PathRecord, with addition of value 0, for
backwards compatibility with current usage.  The changes are:

 - Add enum ib_rate to midlayer includes.
 - Get rid of static rate translation in IPoIB; just use static rate
   directly from Path and MulticastGroup records.
 - Update mthca driver to translate absolute static rate into the
   format used by hardware.  This also fixes mthca's static rate
   handling for HCAs that are capable of 4X DDR.

Signed-off-by: Jack Morgenstein <jackm@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

3 files changed, 4 insertions, 19 deletions

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_fs.c b/drivers/infiniband/ulp/ipoib/ipoib_fs.c
index 685258e34034..5dde380e8dbe 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_fs.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_fs.c
@@ -213,7 +213,7 @@ static int ipoib_path_seq_show(struct seq_file *file, void *iter_ptr)
                    gid_buf, path.pathrec.dlid ? "yes" : "no");
 
         if (path.pathrec.dlid) {
-                rate = ib_sa_rate_enum_to_int(path.pathrec.rate) * 25;
+                rate = ib_rate_to_mult(path.pathrec.rate) * 25;
 
                 seq_printf(file,
                            "  DLID:     0x%04x\n"
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 8f6607bf4261..9cb9e430aaaf 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -373,16 +373,9 @@ static void path_rec_completion(int status,
                 struct ib_ah_attr av = {
                         .dlid          = be16_to_cpu(pathrec->dlid),
                         .sl            = pathrec->sl,
-                        .port_num      = priv->port
+                        .port_num      = priv->port,
+                        .static_rate   = pathrec->rate
                 };
-                int path_rate = ib_sa_rate_enum_to_int(pathrec->rate);
-
-                if (path_rate > 0 && priv->local_rate > path_rate)
-                        av.static_rate = (priv->local_rate - 1) / path_rate;
-
-                ipoib_dbg(priv, "static_rate %d for local port %dX, path %dX\n",
-                          av.static_rate, priv->local_rate,
-                          ib_sa_rate_enum_to_int(pathrec->rate));
 
                 ah = ipoib_create_ah(dev, priv->pd, &av);
         }
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
index a8395ef06c17..07b9826b5193 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
@@ -250,6 +250,7 @@ static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
                         .port_num      = priv->port,
                         .sl            = mcast->mcmember.sl,
                         .ah_flags      = IB_AH_GRH,
+                        .static_rate   = mcast->mcmember.rate,
                         .grh           = {
                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
                                 .hop_limit     = mcast->mcmember.hop_limit,
@@ -257,17 +258,8 @@ static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
                                 .traffic_class = mcast->mcmember.traffic_class
                         }
                 };
-                int path_rate = ib_sa_rate_enum_to_int(mcast->mcmember.rate);
-
                 av.grh.dgid = mcast->mcmember.mgid;
 
-                if (path_rate > 0 && priv->local_rate > path_rate)
-                        av.static_rate = (priv->local_rate - 1) / path_rate;
-
-                ipoib_dbg_mcast(priv, "static_rate %d for local port %dX, mcmember %dX\n",
-                                av.static_rate, priv->local_rate,
-                                ib_sa_rate_enum_to_int(mcast->mcmember.rate));
-
                 ah = ipoib_create_ah(dev, priv->pd, &av);
                 if (!ah) {
                         ipoib_warn(priv, "ib_address_create failed\n");