[PATCH] mbuf: fix API to copy mbuf dynamic fields

[PATCH] mbuf: fix API to copy mbuf dynamic fields

[Shijith Thotton]

Fixed rte_mbuf_dynfield_copy() API to copy dynamic fields from one mbuf
to another. When RTE_IOVA_AS_PA is not defined during the build, an
additional dynamic field (dynfield2) becomes available. This field
should be conditionally copied to ensure the complete duplication of
dynamic fields between mbufs. This patch fixes the same.

see https://bugs.dpdk.org/show_bug.cgi?id=1472

Bugzilla ID: 1472
Fixes: 03b57eb7ab9a ("mbuf: add second dynamic field member")
Cc: stable@dpdk.org

Signed-off-by: Shijith Thotton <sthotton@marvell.com>
---
 lib/mbuf/rte_mbuf.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/mbuf/rte_mbuf.h b/lib/mbuf/rte_mbuf.h
index 4c4722e002..dc6d1237ac 100644
--- a/lib/mbuf/rte_mbuf.h
+++ b/lib/mbuf/rte_mbuf.h
@@ -1120,6 +1120,9 @@ static inline void
 rte_mbuf_dynfield_copy(struct rte_mbuf *mdst, const struct rte_mbuf *msrc)
 {
 	memcpy(&mdst->dynfield1, msrc->dynfield1, sizeof(mdst->dynfield1));
+#if !RTE_IOVA_IN_MBUF
+	mdst->dynfield2 = msrc->dynfield2;
+#endif
 }
 
 /* internal */
-- 
2.25.1

RE: [PATCH] mbuf: fix API to copy mbuf dynamic fields

[Morten Brørup]

> From: Shijith Thotton [mailto:sthotton@marvell.com]
> Sent: Wednesday, 26 June 2024 14.08
> 
> Fixed rte_mbuf_dynfield_copy() API to copy dynamic fields from one mbuf
> to another. When RTE_IOVA_AS_PA is not defined during the build, an
> additional dynamic field (dynfield2) becomes available. This field
> should be conditionally copied to ensure the complete duplication of
> dynamic fields between mbufs. This patch fixes the same.
> 
> see https://bugs.dpdk.org/show_bug.cgi?id=1472
> 
> Bugzilla ID: 1472
> Fixes: 03b57eb7ab9a ("mbuf: add second dynamic field member")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Shijith Thotton <sthotton@marvell.com>

Thank you for fixing this bug.

> ---
>  lib/mbuf/rte_mbuf.h | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/lib/mbuf/rte_mbuf.h b/lib/mbuf/rte_mbuf.h
> index 4c4722e002..dc6d1237ac 100644
> --- a/lib/mbuf/rte_mbuf.h
> +++ b/lib/mbuf/rte_mbuf.h
> @@ -1120,6 +1120,9 @@ static inline void
>  rte_mbuf_dynfield_copy(struct rte_mbuf *mdst, const struct rte_mbuf *msrc)
>  {
>  	memcpy(&mdst->dynfield1, msrc->dynfield1, sizeof(mdst->dynfield1));
> +#if !RTE_IOVA_IN_MBUF
> +	mdst->dynfield2 = msrc->dynfield2;
> +#endif

dynfield2 is located before dynfield1 in the mbuf struct; suggest copy dynfield2 before dynfield1.

>  }
> 
>  /* internal */
> --
> 2.25.1

With or without suggested change,

Reviewed-by: Morten Brørup <mb@smartsharesystems.com>

Re: [PATCH] mbuf: fix API to copy mbuf dynamic fields

[Stephen Hemminger]

On Wed, 26 Jun 2024 17:38:02 +0530
Shijith Thotton <sthotton@marvell.com> wrote:

> Fixed rte_mbuf_dynfield_copy() API to copy dynamic fields from one mbuf
> to another. When RTE_IOVA_AS_PA is not defined during the build, an
> additional dynamic field (dynfield2) becomes available. This field
> should be conditionally copied to ensure the complete duplication of
> dynamic fields between mbufs. This patch fixes the same.
> 
> see https://bugs.dpdk.org/show_bug.cgi?id=1472
> 
> Bugzilla ID: 1472
> Fixes: 03b57eb7ab9a ("mbuf: add second dynamic field member")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Shijith Thotton <sthotton@marvell.com>

Acked-by: Stephen Hemminger <stephen@networkplumber.org>

[PATCH v2] mbuf: fix API to copy mbuf dynamic fields

[Shijith Thotton]

Fixed rte_mbuf_dynfield_copy() API to copy dynamic fields from one mbuf
to another. When RTE_IOVA_AS_PA is not defined during the build, an
additional dynamic field (dynfield2) becomes available. This field
should be conditionally copied to ensure the complete duplication of
dynamic fields between mbufs. This patch fixes the same.

see https://bugs.dpdk.org/show_bug.cgi?id=1472

Bugzilla ID: 1472
Fixes: 03b57eb7ab9a ("mbuf: add second dynamic field member")
Cc: stable@dpdk.org

Signed-off-by: Shijith Thotton <sthotton@marvell.com>
Reviewed-by: Morten Brørup <mb@smartsharesystems.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
---
v2:
- Moved copy of dynfield2 before dynfield1.
- Added Reviewed-by and Acked-by tags.

 lib/mbuf/rte_mbuf.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/mbuf/rte_mbuf.h b/lib/mbuf/rte_mbuf.h
index 4c4722e002..babe16c72c 100644
--- a/lib/mbuf/rte_mbuf.h
+++ b/lib/mbuf/rte_mbuf.h
@@ -1119,6 +1119,9 @@ rte_pktmbuf_attach_extbuf(struct rte_mbuf *m, void *buf_addr,
 static inline void
 rte_mbuf_dynfield_copy(struct rte_mbuf *mdst, const struct rte_mbuf *msrc)
 {
+#if !RTE_IOVA_IN_MBUF
+	mdst->dynfield2 = msrc->dynfield2;
+#endif
 	memcpy(&mdst->dynfield1, msrc->dynfield1, sizeof(mdst->dynfield1));
 }
 
-- 
2.25.1