Add a new padding mode to the txonly forwarding engine, which allows sending packets with configurable small sizes without standard L2/L3 headers. This is useful for testing NIC padding logic.
When padding mode is enabled via --tx-pkt-pad-mode flag: - l2_len and l3_len are set to 0 instead of standard header lengths - Packet data is filled with a static pattern instead of Ethernet/IP/UDP headers - Minimum packet length validation is bypassed to allow small packet sizes (e.g., set txpkts 14) Signed-off-by: Xingui Yang <[email protected]> Signed-off-by: Huisong Li <[email protected]> --- v2: Fix compilation exception of unterminated-string-initialization --- app/test-pmd/config.c | 2 +- app/test-pmd/parameters.c | 7 +++++++ app/test-pmd/testpmd.c | 3 +++ app/test-pmd/testpmd.h | 1 + app/test-pmd/txonly.c | 18 ++++++++++++++++-- 5 files changed, 28 insertions(+), 3 deletions(-) diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c index 9d457ca88e..36b9b023e2 100644 --- a/app/test-pmd/config.c +++ b/app/test-pmd/config.c @@ -6341,7 +6341,7 @@ set_tx_pkt_segments(unsigned int *seg_lengths, unsigned int nb_segs) } tx_pkt_len = (uint16_t)(tx_pkt_len + seg_lengths[i]); } - if (tx_pkt_len < (sizeof(struct rte_ether_hdr) + 20 + 8)) { + if (tx_pkt_len < (sizeof(struct rte_ether_hdr) + 20 + 8) && !tx_pkt_pad_mode) { fprintf(stderr, "total packet length=%u < %d - give up\n", (unsigned) tx_pkt_len, (int)(sizeof(struct rte_ether_hdr) + 20 + 8)); diff --git a/app/test-pmd/parameters.c b/app/test-pmd/parameters.c index 337d8fc8ac..8c3b1244e7 100644 --- a/app/test-pmd/parameters.c +++ b/app/test-pmd/parameters.c @@ -195,6 +195,8 @@ enum { TESTPMD_OPT_TXONLY_MULTI_FLOW_NUM, #define TESTPMD_OPT_TXONLY_FLOWS "txonly-flows" TESTPMD_OPT_TXONLY_FLOWS_NUM, +#define TESTPMD_OPT_TX_PKT_PAD_MODE "tx-pkt-pad-mode" + TESTPMD_OPT_TX_PKT_PAD_MODE_NUM, #define TESTPMD_OPT_RXQ_SHARE "rxq-share" TESTPMD_OPT_RXQ_SHARE_NUM, #define TESTPMD_OPT_ETH_LINK_SPEED "eth-link-speed" @@ -351,6 +353,7 @@ static const struct option long_options[] = { NO_ARG(TESTPMD_OPT_MULTI_RX_MEMPOOL), NO_ARG(TESTPMD_OPT_TXONLY_MULTI_FLOW), REQUIRED_ARG(TESTPMD_OPT_TXONLY_FLOWS), + NO_ARG(TESTPMD_OPT_TX_PKT_PAD_MODE), NO_ARG(TESTPMD_OPT_RXQ_SHARE), REQUIRED_ARG(TESTPMD_OPT_ETH_LINK_SPEED), NO_ARG(TESTPMD_OPT_DISABLE_LINK_CHECK), @@ -504,6 +507,7 @@ usage(char* progname) printf(" --txonly-multi-flow: generate multiple flows in txonly mode\n"); printf(" --txonly-nb-flows=N: number of flows per lcore in txonly" " multi-flow mode (1-64, default 64)\n"); + printf(" --tx-pkt-pad-mode: enable padding mode in txonly mode\n"); printf(" --tx-ip=src,dst: IP addresses in Tx-only mode\n"); printf(" --tx-udp=src[,dst]: UDP ports in Tx-only mode\n"); printf(" --eth-link-speed: force link speed.\n"); @@ -1577,6 +1581,9 @@ launch_args_parse(int argc, char** argv) else rte_exit(EXIT_FAILURE, "txonly-flows must be >= 1 and <= 64\n"); break; + case TESTPMD_OPT_TX_PKT_PAD_MODE_NUM: + tx_pkt_pad_mode = 1; + break; case TESTPMD_OPT_RXQ_SHARE_NUM: rxq_share = 1; break; diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c index fcd8a90967..457bb6d3fe 100644 --- a/app/test-pmd/testpmd.c +++ b/app/test-pmd/testpmd.c @@ -296,6 +296,9 @@ uint32_t tx_pkt_times_inter; uint32_t tx_pkt_times_intra; /**< Timings for send scheduling in TXONLY mode, time between packets. */ +uint8_t tx_pkt_pad_mode; +/**< Whether packet padding mode is enabled. */ + uint16_t nb_pkt_per_burst = DEF_PKT_BURST; /**< Number of packets per burst. */ uint16_t nb_pkt_flowgen_clones; /**< Number of Tx packet clones to send in flowgen mode. */ int nb_flows_flowgen = 1024; /**< Number of flows in flowgen mode. */ diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h index 3d4b36d668..04fdc2db42 100644 --- a/app/test-pmd/testpmd.h +++ b/app/test-pmd/testpmd.h @@ -663,6 +663,7 @@ extern uint16_t tx_pkt_seg_lengths[RTE_MAX_SEGS_PER_PKT]; /**< Seg. lengths */ extern uint8_t tx_pkt_nb_segs; /**< Number of segments in TX packets */ extern uint32_t tx_pkt_times_intra; extern uint32_t tx_pkt_times_inter; +extern uint8_t tx_pkt_pad_mode; enum tx_pkt_split { TX_PKT_SPLIT_OFF, diff --git a/app/test-pmd/txonly.c b/app/test-pmd/txonly.c index 64893fa205..2ddc100f21 100644 --- a/app/test-pmd/txonly.c +++ b/app/test-pmd/txonly.c @@ -192,8 +192,8 @@ pkt_burst_prepare(struct rte_mbuf *pkt, struct rte_mempool *mbp, pkt->ol_flags |= ol_flags; pkt->vlan_tci = vlan_tci; pkt->vlan_tci_outer = vlan_tci_outer; - pkt->l2_len = sizeof(struct rte_ether_hdr); - pkt->l3_len = sizeof(struct rte_ipv4_hdr); + pkt->l2_len = tx_pkt_pad_mode ? 0 : sizeof(struct rte_ether_hdr); + pkt->l3_len = tx_pkt_pad_mode ? 0 : sizeof(struct rte_ipv4_hdr); pkt_len = pkt->data_len; pkt_seg = pkt; @@ -204,6 +204,19 @@ pkt_burst_prepare(struct rte_mbuf *pkt, struct rte_mempool *mbp, pkt_len += pkt_seg->data_len; } pkt_seg->next = NULL; /* Last segment of packet. */ + + if (tx_pkt_pad_mode) { + static const char pad_pattern[] = "0123456789abcdef"; + uint32_t j; + char *pad; + + pad = rte_pktmbuf_mtod(pkt, char *); + for (j = 0; j < pkt->data_len; j++) + pad[j] = pad_pattern[j % 16]; + + goto out; + } + /* * Copy headers in first packet segment(s). */ @@ -295,6 +308,7 @@ pkt_burst_prepare(struct rte_mbuf *pkt, struct rte_mempool *mbp, sizeof(struct rte_ipv4_hdr) + sizeof(pkt_udp_hdr)); } +out: /* * Complete first mbuf of packet and append it to the * burst of packets to be transmitted. -- 2.43.0
