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>

2 files changed, 28 insertions, 28 deletions

diff --git a/include/rdma/ib_sa.h b/include/rdma/ib_sa.h
index f404fe21cc21..ad63c215efe5 100644
--- a/include/rdma/ib_sa.h
+++ b/include/rdma/ib_sa.h
@@ -91,34 +91,6 @@ enum ib_sa_selector {
         IB_SA_BEST = 3
 };
 
-enum ib_sa_rate {
-        IB_SA_RATE_2_5_GBPS = 2,
-        IB_SA_RATE_5_GBPS   = 5,
-        IB_SA_RATE_10_GBPS  = 3,
-        IB_SA_RATE_20_GBPS  = 6,
-        IB_SA_RATE_30_GBPS  = 4,
-        IB_SA_RATE_40_GBPS  = 7,
-        IB_SA_RATE_60_GBPS  = 8,
-        IB_SA_RATE_80_GBPS  = 9,
-        IB_SA_RATE_120_GBPS = 10
-};
-
-static inline int ib_sa_rate_enum_to_int(enum ib_sa_rate rate)
-{
-        switch (rate) {
-        case IB_SA_RATE_2_5_GBPS: return  1;
-        case IB_SA_RATE_5_GBPS:   return  2;
-        case IB_SA_RATE_10_GBPS:  return  4;
-        case IB_SA_RATE_20_GBPS:  return  8;
-        case IB_SA_RATE_30_GBPS:  return 12;
-        case IB_SA_RATE_40_GBPS:  return 16;
-        case IB_SA_RATE_60_GBPS:  return 24;
-        case IB_SA_RATE_80_GBPS:  return 32;
-        case IB_SA_RATE_120_GBPS: return 48;
-        default:                  return -1;
-        }
-}
-
 /*
  * Structures for SA records are named "struct ib_sa_xxx_rec."  No
  * attempt is made to pack structures to match the physical layout of
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index c1ad6273ac6c..6bbf1b364400 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -314,6 +314,34 @@ enum ib_ah_flags {
         IB_AH_GRH       = 1
 };
 
+enum ib_rate {
+        IB_RATE_PORT_CURRENT = 0,
+        IB_RATE_2_5_GBPS = 2,
+        IB_RATE_5_GBPS   = 5,
+        IB_RATE_10_GBPS  = 3,
+        IB_RATE_20_GBPS  = 6,
+        IB_RATE_30_GBPS  = 4,
+        IB_RATE_40_GBPS  = 7,
+        IB_RATE_60_GBPS  = 8,
+        IB_RATE_80_GBPS  = 9,
+        IB_RATE_120_GBPS = 10
+};
+
+/**
+ * ib_rate_to_mult - Convert the IB rate enum to a multiple of the
+ * base rate of 2.5 Gbit/sec.  For example, IB_RATE_5_GBPS will be
+ * converted to 2, since 5 Gbit/sec is 2 * 2.5 Gbit/sec.
+ * @rate: rate to convert.
+ */
+int ib_rate_to_mult(enum ib_rate rate) __attribute_const__;
+
+/**
+ * mult_to_ib_rate - Convert a multiple of 2.5 Gbit/sec to an IB rate
+ * enum.
+ * @mult: multiple to convert.
+ */
+enum ib_rate mult_to_ib_rate(int mult) __attribute_const__;
+
 struct ib_ah_attr {
         struct ib_global_route  grh;
         u16                     dlid;