Occasionally, the amount of packets to free from the work queue ends
perfectly on a boundary to have nb_free = 0 and pool = 0. This causes
a segfault as follows:
(gdb) bt
#0 rte_mempool_default_cache (mp=<optimized out>, mp=<optimized out>,
lcore_id=<optimized out>)
at
/usr/src/debug/openvswitch-2.6.1/dpdk-16.11/x86_64-native-linuxapp-gcc/include/rte_mempool.h:1017
#1 rte_mempool_put_bulk (n=0, obj_table=0x7f10deff2530, mp=0x0)
at
/usr/src/debug/openvswitch-2.6.1/dpdk-16.11/x86_64-native-linuxapp-gcc/include/rte_mempool.h:1174
#2 enic_free_wq_bufs (wq=wq@entry=0x7efabffcd5b0,
completed_index=completed_index@entry=33)
at
/usr/src/debug/openvswitch-2.6.1/dpdk-16.11/drivers/net/enic/enic_rxtx.c:429
#3 0x00007f11e9c86e17 in enic_cleanup_wq (enic=<optimized out>,
wq=wq@entry=0x7efabffcd5b0)
at
/usr/src/debug/openvswitch-2.6.1/dpdk-16.11/drivers/net/enic/enic_rxtx.c:442
#4 0x00007f11e9c86e5f in enic_xmit_pkts (tx_queue=0x7efabffcd5b0,
tx_pkts=0x7f10deffb1a8, nb_pkts=<optimized out>)
at
/usr/src/debug/openvswitch-2.6.1/dpdk-16.11/drivers/net/enic/enic_rxtx.c:470
#5 0x00007f11e9e147ad in rte_eth_tx_burst (nb_pkts=<optimized out>,
tx_pkts=0x7f10deffb1a8, queue_id=0, port_id=<optimized out>)
This commit makes the enic wq driver match other drivers who call the
bulk free, by checking that there are actual packets to free.
Fixes: 36935afbc53c ("net/enic: refactor Tx mbuf recycling")
CC: sta...@dpdk.org
Reported-by: Vincent S. Cojot <vco...@redhat.com>
Reported-at: https://bugzilla.redhat.com/show_bug.cgi?id=1468631
Signed-off-by: Aaron Conole <acon...@redhat.com>
---
drivers/net/enic/enic_rxtx.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/enic/enic_rxtx.c b/drivers/net/enic/enic_rxtx.c
index 5867acf..a39172f 100644
--- a/drivers/net/enic/enic_rxtx.c
+++ b/drivers/net/enic/enic_rxtx.c
@@ -503,7 +503,8 @@ static inline void enic_free_wq_bufs(struct vnic_wq *wq,
u16 completed_index)
tail_idx = enic_ring_incr(desc_count, tail_idx);
}
- rte_mempool_put_bulk(pool, (void **)free, nb_free);
+ if (nb_free > 0)
+ rte_mempool_put_bulk(pool, (void **)free, nb_free);
wq->tail_idx = tail_idx;
wq->ring.desc_avail += nb_to_free;
--
2.9.4
