Resubmitting this series that I did not finish in my previous life (6WIND people are okay with this).
Here is a little series which helped me identify a multi segment issue. Hope it can help others. The difference since the RFC patches I sent some time ago is that, rather than force the user to build the dpdk with CONFIG_RTE_LIBRTE_MBUF_DEBUG enabled, it uses rx/tx callbacks to apply checks on the mbufs. Changelog since v1: - dropped unnecessary casts in patch 1, - rewrote patch 3: reused the existing rx/tx callbacks and left the invalid mbufs in rx bulk Example (with [1] that generates invalid mbufs): ./testpmd --no-huge -l 2,3 -m 512 --log-level *:debug --vdev=eth_ring0 --vdev=eth_ring1 -- -i --total-num-mbufs 2048 [...] testpmd> set verbose 1 testpmd> set burst 4 Number of packets per burst set to 4 testpmd> start tx_first port 0/queue 0: received 4 packets src=00:00:00:00:00:00 - dst=02:00:00:00:00:00 - type=0x0800 - length=64 - nb_segs=2 - sw ptype: L2_ETHER L3_IPV4 L4_UDP - l2_len=14 - l3_len=20 - l4_len=8 - Receive queue=0x0 ol_flags: PKT_RX_L4_CKSUM_UNKNOWN PKT_RX_IP_CKSUM_UNKNOWN PKT_RX_OUTER_L4_CKSUM_UNKNOWN INVALID mbuf: bad nb_segs src=00:00:00:00:00:00 - dst=02:00:00:00:00:00 - type=0x0800 - length=64 - nb_segs=1 - sw ptype: L2_ETHER L3_IPV4 L4_UDP - l2_len=14 - l3_len=20 - l4_len=8 - Receive queue=0x0 ol_flags: PKT_RX_L4_CKSUM_UNKNOWN PKT_RX_IP_CKSUM_UNKNOWN PKT_RX_OUTER_L4_CKSUM_UNKNOWN INVALID mbuf: bad pkt_len src=00:00:00:00:00:00 - dst=02:00:00:00:00:00 - type=0x0800 - length=64 - nb_segs=1 - sw ptype: L2_ETHER L3_IPV4 L4_UDP - l2_len=14 - l3_len=20 - l4_len=8 - Receive queue=0x0 ol_flags: PKT_RX_L4_CKSUM_UNKNOWN PKT_RX_IP_CKSUM_UNKNOWN PKT_RX_OUTER_L4_CKSUM_UNKNOWN INVALID mbuf: bad nb_segs src=00:00:00:00:00:00 - dst=02:00:00:00:00:00 - type=0x0800 - length=64 - nb_segs=2 - sw ptype: L2_ETHER L3_IPV4 L4_UDP - l2_len=14 - l3_len=20 - l4_len=8 - Receive queue=0x0 ol_flags: PKT_RX_L4_CKSUM_UNKNOWN PKT_RX_IP_CKSUM_UNKNOWN PKT_RX_OUTER_L4_CKSUM_UNKNOWN INVALID mbuf: bad nb_segs port 1/queue 0: received 4 packets [...] testpmd> stop 1: https://github.com/david-marchand/dpdk/commit/601630d8db0e -- David Marchand David Marchand (3): mbuf: add sanity checks on segment metadata mbuf: add a non fatal sanity check helper app/testpmd: check mbufs in verbose mode app/test-pmd/util.c | 3 ++ lib/librte_mbuf/Makefile | 2 ++ lib/librte_mbuf/meson.build | 2 ++ lib/librte_mbuf/rte_mbuf.c | 70 +++++++++++++++++++++++++++--------- lib/librte_mbuf/rte_mbuf.h | 23 ++++++++++++ lib/librte_mbuf/rte_mbuf_version.map | 6 ++++ 6 files changed, 89 insertions(+), 17 deletions(-) -- 1.8.3.1
