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From: Stephen Hemminger <stephen@networkplumber.org>
To: dev@dpdk.org
Cc: stable@dpdk.org, Stephen Hemminger <stephen@networkplumber.org>,
	olivier.matz@6wind.com
Subject: [dpdk-dev] [PATCH v2] mbuf: allow dynamic flags to be used by secondary process
Date: Tue, 20 Oct 2020 13:58:05 -0700	[thread overview]
Message-ID: <20201020205805.24311-1-stephen@networkplumber.org> (raw)
In-Reply-To: <20201015172019.3181-1-stephen@networkplumber.org>

The dynamic flag management is broken if rte_mbuf_dynflag_lookup()
is done in a secondary process because the local pointer to
the memzone is not ever initialized.

Fix it by using the same checks as dynfield_register().
I.e if shared memory zone has not been looked up already,
then discover it.

Fixes: 4958ca3a443a ("mbuf: support dynamic fields and flags")
Cc: olivier.matz@6wind.com
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
v2 - move check to inside locked region

 lib/librte_mbuf/rte_mbuf_dyn.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/lib/librte_mbuf/rte_mbuf_dyn.c b/lib/librte_mbuf/rte_mbuf_dyn.c
index 538a43f6959f..717898c0df02 100644
--- a/lib/librte_mbuf/rte_mbuf_dyn.c
+++ b/lib/librte_mbuf/rte_mbuf_dyn.c
@@ -185,13 +185,11 @@ rte_mbuf_dynfield_lookup(const char *name, struct rte_mbuf_dynfield *params)
 {
 	struct mbuf_dynfield_elt *mbuf_dynfield;
 
-	if (shm == NULL) {
-		rte_errno = ENOENT;
-		return -1;
-	}
-
 	rte_mcfg_tailq_read_lock();
-	mbuf_dynfield = __mbuf_dynfield_lookup(name);
+	if (shm == NULL && init_shared_mem() < 0)
+		mbuf_dynfield = NULL;
+	else
+		mbuf_dynfield = __mbuf_dynfield_lookup(name);
 	rte_mcfg_tailq_read_unlock();
 
 	if (mbuf_dynfield == NULL) {
@@ -384,13 +382,11 @@ rte_mbuf_dynflag_lookup(const char *name,
 {
 	struct mbuf_dynflag_elt *mbuf_dynflag;
 
-	if (shm == NULL) {
-		rte_errno = ENOENT;
-		return -1;
-	}
-
 	rte_mcfg_tailq_read_lock();
-	mbuf_dynflag = __mbuf_dynflag_lookup(name);
+	if (shm == NULL && init_shared_mem() < 0)
+		mbuf_dynflag = NULL;
+	else 
+		mbuf_dynflag = __mbuf_dynflag_lookup(name);
 	rte_mcfg_tailq_read_unlock();
 
 	if (mbuf_dynflag == NULL) {
-- 
2.27.0


  parent reply	other threads:[~2020-10-20 20:58 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-15 17:20 [dpdk-dev] [PATCH] " Stephen Hemminger
2020-10-20 12:18 ` Olivier Matz
2020-10-20 20:58 ` Stephen Hemminger [this message]
2020-10-24  0:43 ` [dpdk-dev] [PATCH v3] mbuf: fix dynamic flags lookup from " Stephen Hemminger
2020-10-26 10:39   ` Olivier Matz
2020-10-26 14:49     ` Stephen Hemminger
2020-11-03 21:02       ` Thomas Monjalon
2020-11-04  5:53   ` [dpdk-dev] [PATCH v4] mbuf: allow dynamic flags to be used by " Stephen Hemminger
2020-11-04  8:17     ` Olivier Matz
2020-11-04 16:20   ` [dpdk-dev] [PATCH v5] " Stephen Hemminger
2020-11-04 16:26     ` Olivier Matz
2020-11-04 17:41       ` David Marchand

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