When debugging TSO and other checksum offloads, dumping the various l*_len fields and TSO segmentation size can be helpful.
Example in OVS that dumps a mbuf on rte_eth_tx_prepare failure: Before: netdev_dpdk(pmd-c30/id:11)|DBG|dpdk0: First invalid packet: dump mbuf at 0x2201a916c0, iova=0x2200800580, buf_len=6864 pkt_len=6804, ol_flags=0x3114800000000102, nb_segs=1, port=65535, ptype=0 segment at 0x2201a916c0, data=0x22008005b2, len=6804, off=50, refcnt=1 Dump data at [0x22008005b2], len=6804 ... After: netdev_dpdk(pmd-c30/id:11)|DBG|dpdk0: First invalid packet: dump mbuf at 0x2201a916c0, iova=0x2200800580, buf_len=6864, pkt_len=6804 outer_l2_len=14, outer_l3_len=40, l2_len=38, l3_len=40, l4_len=32, tso_segsz=0 ol_flags=0x3114800000000102, nb_segs=1, port=65535, ptype=0 segment at 0x2201a916c0, data=0x22008005b2, len=6804, off=50, refcnt=1 Dump data at [0x22008005b2], len=6804 ... Signed-off-by: David Marchand <[email protected]> --- lib/mbuf/rte_mbuf.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/lib/mbuf/rte_mbuf.c b/lib/mbuf/rte_mbuf.c index 0d931c7a15..74dcb6c934 100644 --- a/lib/mbuf/rte_mbuf.c +++ b/lib/mbuf/rte_mbuf.c @@ -750,10 +750,12 @@ rte_pktmbuf_dump(FILE *f, const struct rte_mbuf *m, unsigned dump_len) __rte_mbuf_sanity_check(m, 1); - fprintf(f, "dump mbuf at %p, iova=%#" PRIx64 ", buf_len=%u\n", m, rte_mbuf_iova_get(m), - m->buf_len); - fprintf(f, " pkt_len=%u, ol_flags=%#"PRIx64", nb_segs=%u, port=%u", - m->pkt_len, m->ol_flags, m->nb_segs, m->port); + fprintf(f, "dump mbuf at %p, iova=%#" PRIx64 ", buf_len=%u, pkt_len=%u\n", + m, rte_mbuf_iova_get(m), m->buf_len, m->pkt_len); + fprintf(f, " outer_l2_len=%u, outer_l3_len=%u, l2_len=%u, l3_len=%u, l4_len=%u, tso_segsz=%u\n", + m->outer_l2_len, m->outer_l3_len, m->l2_len, m->l3_len, m->l4_len, m->tso_segsz); + fprintf(f, " ol_flags=%#"PRIx64", nb_segs=%u, port=%u", + m->ol_flags, m->nb_segs, m->port); if (m->ol_flags & (RTE_MBUF_F_RX_QINQ | RTE_MBUF_F_TX_QINQ)) fprintf(f, ", vlan_tci_outer=%u", m->vlan_tci_outer); -- 2.51.0
