[dpdk-dev] [PATCH v3 13/13] testpmd: add a verbose mode csum forward engine

[Olivier Matz <olivier.matz@6wind.com>]

If the user specifies 'set verbose 1' in testpmd command line,
the csum forward engine will dump some informations about received
and transmitted packets, especially which flags are set and what
values are assigned to l2_len, l3_len, l4_len and tso_segsz.

This can help someone implementing TSO or hardware checksum offload to
understand how to configure the mbufs.

Example of output for one packet:

 --------------
 rx: l2_len=14 ethertype=800 l3_len=20 l4_proto=6 l4_len=20
 tx: m->l2_len=14 m->l3_len=20 m->l4_len=20
 tx: m->tso_segsz=800
 tx: flags=PKT_TX_IP_CKSUM PKT_TX_TCP_SEG
 --------------

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
---
 app/test-pmd/csumonly.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/app/test-pmd/csumonly.c b/app/test-pmd/csumonly.c
index ec9555f..72b984c 100644
--- a/app/test-pmd/csumonly.c
+++ b/app/test-pmd/csumonly.c
@@ -467,6 +467,57 @@ pkt_burst_checksum_forward(struct fwd_stream *fs)
 		m->tso_segsz = tso_segsz;
 		m->ol_flags = ol_flags;
 
+		/* if verbose mode is enabled, dump debug info */
+		if (verbose_level > 0) {
+			struct {
+				uint64_t flag;
+				uint64_t mask;
+			} tx_flags[] = {
+				{ PKT_TX_IP_CKSUM, PKT_TX_IP_CKSUM },
+				{ PKT_TX_UDP_CKSUM, PKT_TX_L4_MASK },
+				{ PKT_TX_TCP_CKSUM, PKT_TX_L4_MASK },
+				{ PKT_TX_SCTP_CKSUM, PKT_TX_L4_MASK },
+				{ PKT_TX_VXLAN_CKSUM, PKT_TX_VXLAN_CKSUM },
+				{ PKT_TX_TCP_SEG, PKT_TX_TCP_SEG },
+			};
+			unsigned j;
+			const char *name;
+
+			printf("-----------------\n");
+			/* dump rx parsed packet info */
+			printf("rx: l2_len=%d ethertype=%x l3_len=%d "
+				"l4_proto=%d l4_len=%d\n",
+				l2_len, rte_be_to_cpu_16(ethertype),
+				l3_len, l4_proto, l4_len);
+			if (tunnel == 1)
+				printf("rx: outer_l2_len=%d outer_ethertype=%x "
+					"outer_l3_len=%d\n", outer_l2_len,
+					rte_be_to_cpu_16(outer_ethertype),
+					outer_l3_len);
+			/* dump tx packet info */
+			if ((testpmd_ol_flags & (TESTPMD_TX_OFFLOAD_IP_CKSUM |
+						TESTPMD_TX_OFFLOAD_UDP_CKSUM |
+						TESTPMD_TX_OFFLOAD_TCP_CKSUM |
+						TESTPMD_TX_OFFLOAD_SCTP_CKSUM)) ||
+				tso_segsz != 0)
+				printf("tx: m->l2_len=%d m->l3_len=%d "
+					"m->l4_len=%d\n",
+					m->l2_len, m->l3_len, m->l4_len);
+			if ((tunnel == 1) &&
+				(testpmd_ol_flags & TESTPMD_TX_OFFLOAD_VXLAN_CKSUM))
+				printf("tx: m->inner_l2_len=%d m->inner_l3_len=%d\n",
+					m->inner_l2_len, m->inner_l3_len);
+			if (tso_segsz != 0)
+				printf("tx: m->tso_segsz=%d\n", m->tso_segsz);
+			printf("tx: flags=");
+			for (j = 0; j < sizeof(tx_flags)/sizeof(*tx_flags); j++) {
+				name = rte_get_tx_ol_flag_name(tx_flags[j].flag);
+				if ((m->ol_flags & tx_flags[j].mask) ==
+					tx_flags[j].flag)
+					printf("%s ", name);
+			}
+			printf("\n");
+		}
 	}
 	nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue, pkts_burst, nb_rx);
 	fs->tx_packets += nb_tx;
-- 
2.1.0