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authorMichal Soltys <soltys@ziu.info>2016-06-30 02:26:47 +0200
committerDavid S. Miller <davem@davemloft.net>2016-07-01 05:03:43 -0400
commitab12cb4742cf608cfee43c84fe07fa56bd473dcb (patch)
tree00a960cf56b56a0387e63af15e921ae0168bc6ef /net/sched/sch_hfsc.c
parent2354f056f6847125a95b42732ab481730389c099 (diff)
downloadlinux-ab12cb4742cf608cfee43c84fe07fa56bd473dcb.tar.bz2
net/sched/sch_hfsc.c: go passive after vt update
When a class is going passive, it should update its cl_vt first to be consistent with the last dequeue operation. Otherwise its cl_vt will be one packet behind and parent's cvtmax might not be updated as well. One possible side effect is if some class goes passive and subsequently goes active /without/ its parent going passive - with cl_vt lagging one packet behind - comparison made in init_vf() will be affected (same period). Signed-off-by: Michal Soltys <soltys@ziu.info> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_hfsc.c')
-rw-r--r--net/sched/sch_hfsc.c31
1 files changed, 15 insertions, 16 deletions
diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
index df07f060c0e9..4eef857bac4d 100644
--- a/net/sched/sch_hfsc.c
+++ b/net/sched/sch_hfsc.c
@@ -778,6 +778,20 @@ update_vf(struct hfsc_class *cl, unsigned int len, u64 cur_time)
else
go_passive = 0;
+ /* update vt */
+ cl->cl_vt = rtsc_y2x(&cl->cl_virtual, cl->cl_total)
+ - cl->cl_vtoff + cl->cl_vtadj;
+
+ /*
+ * if vt of the class is smaller than cvtmin,
+ * the class was skipped in the past due to non-fit.
+ * if so, we need to adjust vtadj.
+ */
+ if (cl->cl_vt < cl->cl_parent->cl_cvtmin) {
+ cl->cl_vtadj += cl->cl_parent->cl_cvtmin - cl->cl_vt;
+ cl->cl_vt = cl->cl_parent->cl_cvtmin;
+ }
+
if (go_passive) {
/* no more active child, going passive */
@@ -794,25 +808,10 @@ update_vf(struct hfsc_class *cl, unsigned int len, u64 cur_time)
continue;
}
- /*
- * update vt and f
- */
- cl->cl_vt = rtsc_y2x(&cl->cl_virtual, cl->cl_total)
- - cl->cl_vtoff + cl->cl_vtadj;
-
- /*
- * if vt of the class is smaller than cvtmin,
- * the class was skipped in the past due to non-fit.
- * if so, we need to adjust vtadj.
- */
- if (cl->cl_vt < cl->cl_parent->cl_cvtmin) {
- cl->cl_vtadj += cl->cl_parent->cl_cvtmin - cl->cl_vt;
- cl->cl_vt = cl->cl_parent->cl_cvtmin;
- }
-
/* update the vt tree */
vttree_update(cl);
+ /* update f */
if (cl->cl_flags & HFSC_USC) {
cl->cl_myf = cl->cl_myfadj + rtsc_y2x(&cl->cl_ulimit,
cl->cl_total);