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Olivier Matz efc6f9104c mbuf: fix reset on mbuf free 
m->nb_seg must be reset on mbuf free whatever the value of m->next,
because it can happen that m->nb_seg is != 1. For instance in this
case:

  m1 = rte_pktmbuf_alloc(mp);
  rte_pktmbuf_append(m1, 500);
  m2 = rte_pktmbuf_alloc(mp);
  rte_pktmbuf_append(m2, 500);
  rte_pktmbuf_chain(m1, m2);
  m0 = rte_pktmbuf_alloc(mp);
  rte_pktmbuf_append(m0, 500);
  rte_pktmbuf_chain(m0, m1);

As rte_pktmbuf_chain() does not reset nb_seg in the initial m1
segment (this is not required), after this code the mbuf chain
have 3 segments:
  - m0: next=m1, nb_seg=3
  - m1: next=m2, nb_seg=2
  - m2: next=NULL, nb_seg=1

Then split this chain between m1 and m2, it would result in 2 packets:
  - first packet
    - m0: next=m1, nb_seg=2
    - m1: next=NULL, nb_seg=2
  - second packet
    - m2: next=NULL, nb_seg=1

Freeing the first packet will not restore nb_seg=1 in the second
segment. This is an issue because it is expected that mbufs stored
in pool have their nb_seg field set to 1.

Fixes: 8f094a9ac5 ("mbuf: set mbuf fields while in pool")
Cc: stable@dpdk.org

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
Acked-by: Morten Brørup <mb@smartsharesystems.com>
Acked-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Tested-by: Ali Alnubani <alialnu@nvidia.com>
2021-10-21 11:18:54 +02:00
.ci build: update minimum required Meson version 2021-04-16 18:51:51 +02:00
.github/workflows version: 21.11-rc0 2021-08-17 08:37:52 +02:00
app mbuf: fix reset on mbuf free 2021-10-21 11:18:54 +02:00
buildtools buildtools: enable header includes check on Windows 2021-10-11 21:17:21 +02:00
config config/cn10k: disable octeontx2 drivers 2021-10-08 11:07:47 +02:00
devtools net/bnxt: support tunnel offload 2021-09-21 06:26:00 +02:00
doc app/testpmd: add flex item commands 2021-10-20 19:00:26 +02:00
drivers net/ice: fix sideband queue initialization 2021-10-20 03:37:37 +02:00
examples examples/ip_reassembly: remove unused option 2021-10-18 19:20:21 +02:00
kernel kni: fix crash on userspace VA for segmented packets 2021-06-24 10:04:25 +02:00
lib mbuf: fix reset on mbuf free 2021-10-21 11:18:54 +02:00
license lib: remove librte_ prefix from directory names 2021-04-21 14:04:09 +02:00
usertools usertools/telemetry: list file-prefixes 2021-10-19 17:15:10 +02:00
.editorconfig doc: add Meson coding style to contributors guide 2021-04-21 14:04:09 +02:00
.gitattributes improve git diff 2016-11-13 15:25:12 +01:00
.gitignore doc: add flow API features tables 2021-05-18 19:06:56 +02:00
.travis.yml version: 21.11-rc0 2021-08-17 08:37:52 +02:00
ABI_VERSION version: 21.11-rc0 2021-08-17 08:37:52 +02:00
MAINTAINERS baseband/la12xx: introduce NXP LA12xx driver 2021-10-18 20:11:23 +02:00
Makefile build: create dummy Makefile 2020-09-07 23:51:57 +02:00
meson_options.txt build: add optional NUMA and CPU counts detection 2021-09-16 09:43:28 +02:00
meson.build lib: remove librte_ prefix from directory names 2021-04-21 14:04:09 +02:00
README license: introduce SPDX identifiers 2018-01-04 22:41:38 +01:00
VERSION version: 21.11-rc0 2021-08-17 08:37:52 +02:00

README 

DPDK is a set of libraries and drivers for fast packet processing.
It supports many processor architectures and both FreeBSD and Linux.

The DPDK uses the Open Source BSD-3-Clause license for the core libraries
and drivers. The kernel components are GPL-2.0 licensed.

Please check the doc directory for release notes,
API documentation, and sample application information.

For questions and usage discussions, subscribe to: users@dpdk.org
Report bugs and issues to the development mailing list: dev@dpdk.org