diff mbox series

[v5] mbuf: allow dynamic flags to be used by secondary process

Message ID 20201104162000.9419-1-stephen@networkplumber.org (mailing list archive)
State Accepted, archived
Delegated to: David Marchand
Headers
Series [v5] mbuf: allow dynamic flags to be used by secondary process |

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation success Compilation OK
ci/travis-robot success Travis build: passed

Commit Message

Stephen Hemminger Nov. 4, 2020, 4:20 p.m. UTC 
  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>
---
v5 - fix additional rte_errno overwrite

 lib/librte_mbuf/rte_mbuf_dyn.c | 30 +++++++++++-------------------
 1 file changed, 11 insertions(+), 19 deletions(-)

Comments

Olivier Matz Nov. 4, 2020, 4:26 p.m. UTC | #1 
On Wed, Nov 04, 2020 at 08:20:00AM -0800, Stephen Hemminger wrote:
> 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>

Acked-by: Olivier Matz <olivier.matz@6wind.com>

Thanks!
David Marchand Nov. 4, 2020, 5:41 p.m. UTC | #2 
On Wed, Nov 4, 2020 at 5:27 PM Olivier Matz <olivier.matz@6wind.com> wrote:
> On Wed, Nov 04, 2020 at 08:20:00AM -0800, Stephen Hemminger wrote:
> > 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: stable@dpdk.org

> > Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> Acked-by: Olivier Matz <olivier.matz@6wind.com>

Applied, thanks.
diff mbox series

Patch

diff --git a/lib/librte_mbuf/rte_mbuf_dyn.c b/lib/librte_mbuf/rte_mbuf_dyn.c
index 538a43f6959f..c2f7220e7ba3 100644
--- a/lib/librte_mbuf/rte_mbuf_dyn.c
+++ b/lib/librte_mbuf/rte_mbuf_dyn.c
@@ -172,7 +172,7 @@  __mbuf_dynfield_lookup(const char *name)
 			break;
 	}
 
-	if (te == NULL) {
+	if (te == NULL || mbuf_dynfield == NULL) {
 		rte_errno = ENOENT;
 		return NULL;
 	}
@@ -185,19 +185,15 @@  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) {
-		rte_errno = ENOENT;
+	if (mbuf_dynfield == NULL)
 		return -1;
-	}
 
 	if (params != NULL)
 		memcpy(params, &mbuf_dynfield->params, sizeof(*params));
@@ -384,19 +380,15 @@  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) {
-		rte_errno = ENOENT;
+	if (mbuf_dynflag == NULL)
 		return -1;
-	}
 
 	if (params != NULL)
 		memcpy(params, &mbuf_dynflag->params, sizeof(*params));