1 files changed, 8 insertions, 1 deletions

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 6eab63363e59..e5ae0c50fa9c 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -683,13 +683,19 @@ struct psched_ratecfg {
         u64     rate_bytes_ps; /* bytes per second */
         u32     mult;
         u16     overhead;
+        u8      linklayer;
         u8      shift;
 };
 
 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
                                 unsigned int len)
 {
-        return ((u64)(len + r->overhead) * r->mult) >> r->shift;
+        len += r->overhead;
+
+        if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
+                return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
+
+        return ((u64)len * r->mult) >> r->shift;
 }
 
 extern void psched_ratecfg_precompute(struct psched_ratecfg *r, const struct tc_ratespec *conf);
@@ -700,6 +706,7 @@ static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
         memset(res, 0, sizeof(*res));
         res->rate = r->rate_bytes_ps;
         res->overhead = r->overhead;
+        res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
 }
 
 #endif