e4e74c3a "dpif-netdev: Purge all ukeys when reconfigure pmd." introduced a new
dp_purge_cb function, which calls udpif_pause_revalidators() and that tries to
block on pause_barrier.
But if OVS was started with flow-restore-wait="true" (e.g. through ovs-ctl),
type_run() will have backer->recv_set_enable == false, and udpif_set_threads
won't initialize the barrier, which leads to a segfault like this:
#0 seq_read (seq=0x0) at lib/seq.c:121
#1 0x00000000004f33a2 in ovs_barrier_block (barrier=barrier@entry=0x9304a0) at
lib/ovs-thread.c:291
#2 0x0000000000445a01 in udpif_pause_revalidators (udpif=0x930410) at
ofproto/ofproto-dpif-upcall.c:526
#3 dp_purge_cb (aux=0x930410, pmd_id=4294967295) at
ofproto/ofproto-dpif-upcall.c:2271
#4 0x0000000000471552 in dp_netdev_del_pmd (pmd=pmd@entry=0x961f10,
dp=<optimised out>, dp=<optimised out>) at lib/dpif-netdev.c:2891
#5 0x00000000004716d9 in dp_netdev_destroy_all_pmds (dp=0x948550) at
lib/dpif-netdev.c:2904
#6 dpif_netdev_pmd_set (dpif=<optimised out>, n_rxqs=1, cmask=0x946250 "2") at
lib/dpif-netdev.c:2385
#7 0x000000000047873a in dpif_poll_threads_set (dpif=0x95ed10,
n_rxqs=<optimised out>, cmask=<optimised out>) at lib/dpif.c:1411
#8 0x000000000043897f in type_run (type=<optimised out>) at
ofproto/ofproto-dpif.c:558
#9 0x000000000042b195 in ofproto_type_run (datapath_type=<optimised out>,
datapath_type@entry=0xcf23e0 "netdev") at ofproto/ofproto.c:1655
#10 0x000000000040f395 in bridge_run__ () at vswitchd/bridge.c:2875
#11 0x00000000004155b3 in bridge_reconfigure (ovs_cfg=ovs_cfg@entry=0x961db0)
at vswitchd/bridge.c:700
#12 0x0000000000418439 in bridge_run () at vswitchd/bridge.c:2984
#13 0x000000000040d025 in main (argc=11, argv=0x7fffffffe9a8) at
vswitchd/ovs-vswitchd.c:120
This patch introduces ofproto_dpif_backer_enabled(), which checks
recv_set_enable before touching the latch and blocking on pause_barrier.
Signed-off-by: Zoltan Kiss <zoltan.k...@linaro.org>
---
v2:
- ofproto_dpif_backer_enabled() to check recv_set_enable
- do not touch the latch
v3:
- rebase to latest master
- don't touch control chars
diff --git a/ofproto/ofproto-dpif-upcall.c b/ofproto/ofproto-dpif-upcall.c
index 8a43bbf..3b897e0 100644
--- a/ofproto/ofproto-dpif-upcall.c
+++ b/ofproto/ofproto-dpif-upcall.c
@@ -522,8 +522,10 @@ udpif_start_threads(struct udpif *udpif, size_t n_handlers,
static void
udpif_pause_revalidators(struct udpif *udpif)
{
- latch_set(&udpif->pause_latch);
- ovs_barrier_block(&udpif->pause_barrier);
+ if (ofproto_dpif_backer_enabled(udpif->backer)) {
+ latch_set(&udpif->pause_latch);
+ ovs_barrier_block(&udpif->pause_barrier);
+ }
}
/* Resumes the pausing of revalidators. Should only be called by the
@@ -531,8 +533,10 @@ udpif_pause_revalidators(struct udpif *udpif)
static void
udpif_resume_revalidators(struct udpif *udpif)
{
- latch_poll(&udpif->pause_latch);
- ovs_barrier_block(&udpif->pause_barrier);
+ if (ofproto_dpif_backer_enabled(udpif->backer)) {
+ latch_poll(&udpif->pause_latch);
+ ovs_barrier_block(&udpif->pause_barrier);
+ }
}
/* Tells 'udpif' how many threads it should use to handle upcalls.
diff --git a/ofproto/ofproto-dpif.c b/ofproto/ofproto-dpif.c
index cffedb9..ef1ad18 100644
--- a/ofproto/ofproto-dpif.c
+++ b/ofproto/ofproto-dpif.c
@@ -515,6 +515,12 @@ lookup_ofproto_dpif_by_port_name(const char *name)
return NULL;
}
+bool
+ofproto_dpif_backer_enabled(struct dpif_backer* backer)
+{
+ return backer->recv_set_enable;
+}
+
static int
type_run(const char *type)
{
diff --git a/ofproto/ofproto-dpif.h b/ofproto/ofproto-dpif.h
index 2397fb4..dab422a 100644
--- a/ofproto/ofproto-dpif.h
+++ b/ofproto/ofproto-dpif.h
@@ -169,6 +169,8 @@ struct ofport_dpif *odp_port_to_ofport(const struct
dpif_backer *, odp_port_t);
struct ofport_dpif *ofp_port_to_ofport(const struct ofproto_dpif *,
ofp_port_t);
+bool ofproto_dpif_backer_enabled(struct dpif_backer* backer);
+
int ofproto_dpif_add_internal_flow(struct ofproto_dpif *,
const struct match *, int priority,
uint16_t idle_timeout,
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