1 files changed, 27 insertions, 0 deletions

diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index 70ab2f716f83..66afa086ae72 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -543,6 +543,33 @@ out:
         return rc ? rc : local_contact;
 }
 
+/* convert the RMB size into the compressed notation - minimum 16K.
+ * In contrast to plain ilog2, this rounds towards the next power of 2,
+ * so the socket application gets at least its desired sndbuf / rcvbuf size.
+ */
+static u8 smc_compress_bufsize(int size)
+{
+        u8 compressed;
+
+        if (size <= SMC_BUF_MIN_SIZE)
+                return 0;
+
+        size = (size - 1) >> 14;
+        compressed = ilog2(size) + 1;
+        if (compressed >= SMC_RMBE_SIZES)
+                compressed = SMC_RMBE_SIZES - 1;
+        return compressed;
+}
+
+/* convert the RMB size from compressed notation into integer */
+int smc_uncompress_bufsize(u8 compressed)
+{
+        u32 size;
+
+        size = 0x00000001 << (((int)compressed) + 14);
+        return (int)size;
+}
+
 /* try to reuse a sndbuf or rmb description slot for a certain
  * buffer size; if not available, return NULL
  */