[dpdk-dev] [PATCH] app: fix refcnt in mbuf allocation
Thomas Monjalon
thomas.monjalon at 6wind.com
Mon May 6 14:47:50 CEST 2013
Hi Dongsu Han,
I think your fix is right.
I've just removed tx_mbuf_alloc() and directly called rte_pktmbuf_alloc() instead.
Is it OK for you ?
Could you also review this (modified) description ?
Thank you
---
From: Dongsu Han <dongsuh at cs.cmu.edu>
test-pmd txonly leaks mbuf from the pool.
The function tx_mbuf_alloc() does not change the refcnt
and the refcnt is 0 when it is first allocated.
However, rte_pktmbuf_free_seg called by the driver's xmit code decrements
reference count to -1. So mbuf never goes back to the pool.
As a result, txonly can't send packets after it exhausts the mempool.
The function tx_mbuf_alloc() was getting mbuf directly from mempool and so
was bypassing mbuf API.
By using the right API, refcnt is correctly handled among other
initializations.
Signed-off-by: Dongsu Han <dongsuh at cs.cmu.edu>
Signed-off-by: Thomas Monjalon <thomas.monjalon at 6wind.com>
---
app/test-pmd/txonly.c | 17 ++---------------
1 file changed, 2 insertions(+), 15 deletions(-)
diff --git a/app/test-pmd/txonly.c b/app/test-pmd/txonly.c
index d7c8c31..53f7138 100644
--- a/app/test-pmd/txonly.c
+++ b/app/test-pmd/txonly.c
@@ -89,19 +89,6 @@
static struct ipv4_hdr pkt_ip_hdr; /**< IP header of transmitted packets. */
static struct udp_hdr pkt_udp_hdr; /**< UDP header of transmitted packets. */
-static inline struct rte_mbuf *
-tx_mbuf_alloc(struct rte_mempool *mp)
-{
- struct rte_mbuf *m;
- void *mb;
-
- if (rte_mempool_get(mp, &mb) < 0)
- return NULL;
- m = (struct rte_mbuf *)mb;
- __rte_mbuf_sanity_check(m, RTE_MBUF_PKT, 1);
- return m;
-}
-
static void
copy_buf_to_pkt_segs(void* buf, unsigned len, struct rte_mbuf *pkt,
unsigned offset)
@@ -223,7 +210,7 @@ pkt_burst_transmit(struct fwd_stream *fs)
vlan_tci = ports[fs->tx_port].tx_vlan_id;
ol_flags = ports[fs->tx_port].tx_ol_flags;
for (nb_pkt = 0; nb_pkt < nb_pkt_per_burst; nb_pkt++) {
- pkt = tx_mbuf_alloc(mbp);
+ pkt = rte_pktmbuf_alloc(mbp);
if (pkt == NULL) {
nomore_mbuf:
if (nb_pkt == 0)
@@ -233,7 +220,7 @@ pkt_burst_transmit(struct fwd_stream *fs)
pkt->pkt.data_len = tx_pkt_seg_lengths[0];
pkt_seg = pkt;
for (i = 1; i < tx_pkt_nb_segs; i++) {
- pkt_seg->pkt.next = tx_mbuf_alloc(mbp);
+ pkt_seg->pkt.next = rte_pktmbuf_alloc(mbp);
if (pkt_seg->pkt.next == NULL) {
pkt->pkt.nb_segs = i;
rte_pktmbuf_free(pkt);
--
1.7.10.4
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