From 0eb89ba9f49f3f5979a974b9208100eed36c382e Mon Sep 17 00:00:00 2001 From: Viacheslav Ovsiienko Date: Sun, 9 Feb 2020 17:02:39 +0000 Subject: [PATCH] app/testpmd: fix txonly flow generation entropy The testpmd application in txonly forwarding mode has an option to generate the packet flows by varying the destination IP address. The patch increments the IP for each packet sent, this improves the entropy and RSS distribution on the peer receiving size is getting more uniform. Fixes: 01b645dcff7f ("app/testpmd: move txonly prepare in separate function") Cc: stable@dpdk.org Signed-off-by: Viacheslav Ovsiienko Reviewed-by: Ferruh Yigit --- app/test-pmd/txonly.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/app/test-pmd/txonly.c b/app/test-pmd/txonly.c index 4b5bec443b..8a1989fc96 100644 --- a/app/test-pmd/txonly.c +++ b/app/test-pmd/txonly.c @@ -153,7 +153,6 @@ pkt_burst_prepare(struct rte_mbuf *pkt, struct rte_mempool *mbp, const uint16_t vlan_tci_outer, const uint64_t ol_flags) { struct rte_mbuf *pkt_segs[RTE_MAX_SEGS_PER_PKT]; - uint8_t ip_var = RTE_PER_LCORE(_ip_var); struct rte_mbuf *pkt_seg; uint32_t nb_segs, pkt_len; uint8_t i; @@ -193,6 +192,7 @@ pkt_burst_prepare(struct rte_mbuf *pkt, struct rte_mempool *mbp, copy_buf_to_pkt(&pkt_ip_hdr, sizeof(pkt_ip_hdr), pkt, sizeof(struct rte_ether_hdr)); if (txonly_multi_flow) { + uint8_t ip_var = RTE_PER_LCORE(_ip_var); struct rte_ipv4_hdr *ip_hdr; uint32_t addr; @@ -208,6 +208,7 @@ pkt_burst_prepare(struct rte_mbuf *pkt, struct rte_mempool *mbp, */ addr = (tx_ip_dst_addr | (ip_var++ << 8)) + rte_lcore_id(); ip_hdr->src_addr = rte_cpu_to_be_32(addr); + RTE_PER_LCORE(_ip_var) = ip_var; } copy_buf_to_pkt(&pkt_udp_hdr, sizeof(pkt_udp_hdr), pkt, sizeof(struct rte_ether_hdr) + @@ -315,7 +316,7 @@ pkt_burst_transmit(struct fwd_stream *fs) fs->tx_packets += nb_tx; if (txonly_multi_flow) - RTE_PER_LCORE(_ip_var) += nb_tx; + RTE_PER_LCORE(_ip_var) -= nb_pkt - nb_tx; #ifdef RTE_TEST_PMD_RECORD_BURST_STATS fs->tx_burst_stats.pkt_burst_spread[nb_tx]++; -- 2.20.1