[ovs-dev] [PATCH v1 03/14] dp-packet: Fix allocated size on DPDK init.

Tiago Lam tiago.lam at intel.com
Thu Jun 28 15:41:40 UTC 2018

When enabled with DPDK OvS deals with two types of packets, the ones
coming from the mempool and the ones locally created by OvS - which are
copied to mempool mbufs before output. In the latter, the space is
allocated from the system, while in the former the mbufs are allocated
from a mempool, which takes care of initialising them appropriately.

In the current implementation, during mempool's initialisation of mbufs,
dp_packet_set_allocated() is called from dp_packet_init_dpdk() without
considering that the allocated space, in the case of multi-segment
mbufs, might be greater than a single mbuf.  Furthermore, given that
dp_packet_init_dpdk() is on the code path that's called upon mempool's
initialisation, a call to dp_packet_set_allocated() is redundant, since
mempool takes care of initialising it.

To fix this, dp_packet_set_allocated() is no longer called after
initialisation of a mempool, only in dp_packet_init__(), which is still
called by OvS when initialising locally created packets.

Signed-off-by: Tiago Lam <tiago.lam at intel.com>
Acked-by: Eelco Chaudron <echaudro at redhat.com>
 lib/dp-packet.c   | 3 +--
 lib/dp-packet.h   | 2 +-
 lib/netdev-dpdk.c | 2 +-
 3 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/lib/dp-packet.c b/lib/dp-packet.c
index 443c225..782e7c2 100644
--- a/lib/dp-packet.c
+++ b/lib/dp-packet.c
@@ -99,9 +99,8 @@ dp_packet_use_const(struct dp_packet *b, const void *data, size_t size)
  * buffer.  Here, non-transient ovs dp-packet fields are initialized for
  * packets that are part of a DPDK memory pool. */
-dp_packet_init_dpdk(struct dp_packet *b, size_t allocated)
+dp_packet_init_dpdk(struct dp_packet *b)
-    dp_packet_set_allocated(b, allocated);
     b->source = DPBUF_DPDK;
diff --git a/lib/dp-packet.h b/lib/dp-packet.h
index cfe0824..c612ad4 100644
--- a/lib/dp-packet.h
+++ b/lib/dp-packet.h
@@ -114,7 +114,7 @@ void dp_packet_use(struct dp_packet *, void *, size_t);
 void dp_packet_use_stub(struct dp_packet *, void *, size_t);
 void dp_packet_use_const(struct dp_packet *, const void *, size_t);
-void dp_packet_init_dpdk(struct dp_packet *, size_t allocated);
+void dp_packet_init_dpdk(struct dp_packet *);
 void dp_packet_init(struct dp_packet *, size_t);
 void dp_packet_uninit(struct dp_packet *);
diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c
index ed894d8..c5c6aab 100644
--- a/lib/netdev-dpdk.c
+++ b/lib/netdev-dpdk.c
@@ -520,7 +520,7 @@ ovs_rte_pktmbuf_init(struct rte_mempool *mp OVS_UNUSED,
     struct rte_mbuf *pkt = _p;
-    dp_packet_init_dpdk((struct dp_packet *) pkt, pkt->buf_len);
+    dp_packet_init_dpdk((struct dp_packet *) pkt);
 static int

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