1 files changed, 6 insertions, 2 deletions

diff --git a/include/linux/tfrc.h b/include/linux/tfrc.h
index 31a9b25276fe..8a8462b4a4dd 100644
--- a/include/linux/tfrc.h
+++ b/include/linux/tfrc.h
@@ -37,10 +37,14 @@ struct tfrc_rx_info {
  *      @tfrctx_p:      current loss event rate (5.4)
  *      @tfrctx_rto:    estimate of RTO, equals 4*RTT (4.3)
  *      @tfrctx_ipi:    inter-packet interval (4.6)
+ *
+ *  Note: X and X_recv are both maintained in units of 64 * bytes/second. This
+ *        enables a finer resolution of sending rates and avoids problems with
+ *        integer arithmetic; u32 is not sufficient as scaling consumes 6 bits.
  */
 struct tfrc_tx_info {
-        __u32 tfrctx_x;
-        __u32 tfrctx_x_recv;
+        __u64 tfrctx_x;
+        __u64 tfrctx_x_recv;
         __u32 tfrctx_x_calc;
         __u32 tfrctx_rtt;
         __u32 tfrctx_p;