From: Pavan Nikhilesh <pbhagavat...@marvell.com>
Optimize testpmd txonly mode by
1. Moving per packet ethernet header copy above the loop.
2. Use bulk ops for allocating segments instead of having a inner loop
for every segment.
Also, move the packet prepare logic into a separate function so that it
can be reused later.
Signed-off-by: Pavan Nikhilesh <pbhagavat...@marvell.com>
---
v3 Changes:
- Split the patches for easier review. (Thomas)
- Remove unnecessary assignments to 0. (Bernard)
v2 Changes:
- Use bulk ops for fetching segments. (Andrew Rybchenko)
- Fallback to rte_mbuf_raw_alloc if bulk get fails. (Andrew Rybchenko)
- Fix mbufs not being freed when there is no more mbufs available for
segments. (Andrew Rybchenko)
app/test-pmd/txonly.c | 140 +++++++++++++++++++++++-------------------
1 file changed, 76 insertions(+), 64 deletions(-)
diff --git a/app/test-pmd/txonly.c b/app/test-pmd/txonly.c
index 1f08b6ed3..5610e0e42 100644
--- a/app/test-pmd/txonly.c
+++ b/app/test-pmd/txonly.c
@@ -147,6 +147,62 @@ setup_pkt_udp_ip_headers(struct ipv4_hdr *ip_hdr,
ip_hdr->hdr_checksum = (uint16_t) ip_cksum;
}
+static inline bool
+pkt_burst_prepare(struct rte_mbuf *pkt, struct rte_mempool *mbp,
+ struct ether_hdr *eth_hdr, const uint16_t vlan_tci,
+ const uint16_t vlan_tci_outer, const uint64_t ol_flags)
+{
+ struct rte_mbuf *pkt_segs[RTE_MAX_SEGS_PER_PKT];
+ struct rte_mbuf *pkt_seg;
+ uint32_t nb_segs, pkt_len;
+ uint8_t i;
+
+ if (unlikely(tx_pkt_split == TX_PKT_SPLIT_RND))
+ nb_segs = random() % tx_pkt_nb_segs + 1;
+ else
+ nb_segs = tx_pkt_nb_segs;
+
+ if (nb_segs > 1) {
+ if (rte_mempool_get_bulk(mbp, (void **)pkt_segs, nb_segs))
+ return false;
+ }
+
+ rte_pktmbuf_reset_headroom(pkt);
+ pkt->data_len = tx_pkt_seg_lengths[0];
+ pkt->ol_flags = ol_flags;
+ pkt->vlan_tci = vlan_tci;
+ pkt->vlan_tci_outer = vlan_tci_outer;
+ pkt->l2_len = sizeof(struct ether_hdr);
+ pkt->l3_len = sizeof(struct ipv4_hdr);
+
+ pkt_seg = pkt;
+ for (i = 1; i < nb_segs; i++) {
+ pkt_seg->next = pkt_segs[i - 1];
+ pkt_seg = pkt_seg->next;
+ pkt_seg->data_len = tx_pkt_seg_lengths[i];
+ pkt_len += pkt_seg->data_len;
+ }
+ pkt_seg->next = NULL; /* Last segment of packet. */
+ /*
+ * Copy headers in first packet segment(s).
+ */
+ copy_buf_to_pkt(eth_hdr, sizeof(eth_hdr), pkt, 0);
+ copy_buf_to_pkt(&pkt_ip_hdr, sizeof(pkt_ip_hdr), pkt,
+ sizeof(struct ether_hdr));
+ copy_buf_to_pkt(&pkt_udp_hdr, sizeof(pkt_udp_hdr), pkt,
+ sizeof(struct ether_hdr) +
+ sizeof(struct ipv4_hdr));
+
+ /*
+ * Complete first mbuf of packet and append it to the
+ * burst of packets to be transmitted.
+ */
+ pkt->nb_segs = nb_segs;
+ pkt->pkt_len += pkt_len;
+
+ return true;
+}
+
/*
* Transmit a burst of multi-segments packets.
*/
@@ -154,9 +210,8 @@ static void
pkt_burst_transmit(struct fwd_stream *fs)
{
struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
- struct rte_port *txp;
struct rte_mbuf *pkt;
- struct rte_mbuf *pkt_seg;
+ struct rte_port *txp;
struct rte_mempool *mbp;
struct ether_hdr eth_hdr;
uint16_t nb_tx;
@@ -164,14 +219,12 @@ pkt_burst_transmit(struct fwd_stream *fs)
uint16_t vlan_tci, vlan_tci_outer;
uint32_t retry;
uint64_t ol_flags = 0;
- uint8_t i;
uint64_t tx_offloads;
#ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
uint64_t start_tsc;
uint64_t end_tsc;
uint64_t core_cycles;
#endif
- uint32_t nb_segs, pkt_len;
#ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
start_tsc = rte_rdtsc();
@@ -188,72 +241,31 @@ pkt_burst_transmit(struct fwd_stream *fs)
ol_flags |= PKT_TX_QINQ_PKT;
if (tx_offloads & DEV_TX_OFFLOAD_MACSEC_INSERT)
ol_flags |= PKT_TX_MACSEC;
+
+ /*
+ * Initialize Ethernet header.
+ */
+ ether_addr_copy(&peer_eth_addrs[fs->peer_addr], ð_hdr.d_addr);
+ ether_addr_copy(&ports[fs->tx_port].eth_addr, ð_hdr.s_addr);
+ eth_hdr.ether_type = rte_cpu_to_be_16(ETHER_TYPE_IPv4);
+
for (nb_pkt = 0; nb_pkt < nb_pkt_per_burst; nb_pkt++) {
pkt = rte_mbuf_raw_alloc(mbp);
- if (pkt == NULL) {
- nomore_mbuf:
- if (nb_pkt == 0)
- return;
+ if (pkt == NULL)
+ break;
+ if (unlikely(!pkt_burst_prepare(pkt, mbp,
+ ð_hdr, vlan_tci,
+ vlan_tci_outer,
+ ol_flags))) {
+ rte_mempool_put(mbp, pkt);
break;
}
-
- /*
- * Using raw alloc is good to improve performance,
- * but some consumers may use the headroom and so
- * decrement data_off. We need to make sure it is
- * reset to default value.
- */
- rte_pktmbuf_reset_headroom(pkt);
- pkt->data_len = tx_pkt_seg_lengths[0];
- pkt_seg = pkt;
- if (tx_pkt_split == TX_PKT_SPLIT_RND)
- nb_segs = random() % tx_pkt_nb_segs + 1;
- else
- nb_segs = tx_pkt_nb_segs;
- pkt_len = pkt->data_len;
- for (i = 1; i < nb_segs; i++) {
- pkt_seg->next = rte_mbuf_raw_alloc(mbp);
- if (pkt_seg->next == NULL) {
- pkt->nb_segs = i;
- rte_pktmbuf_free(pkt);
- goto nomore_mbuf;
- }
- pkt_seg = pkt_seg->next;
- pkt_seg->data_len = tx_pkt_seg_lengths[i];
- pkt_len += pkt_seg->data_len;
- }
- pkt_seg->next = NULL; /* Last segment of packet. */
-
- /*
- * Initialize Ethernet header.
- */
- ether_addr_copy(&peer_eth_addrs[fs->peer_addr],ð_hdr.d_addr);
- ether_addr_copy(&ports[fs->tx_port].eth_addr, ð_hdr.s_addr);
- eth_hdr.ether_type = rte_cpu_to_be_16(ETHER_TYPE_IPv4);
-
- /*
- * Copy headers in first packet segment(s).
- */
- copy_buf_to_pkt(ð_hdr, sizeof(eth_hdr), pkt, 0);
- copy_buf_to_pkt(&pkt_ip_hdr, sizeof(pkt_ip_hdr), pkt,
- sizeof(struct ether_hdr));
- copy_buf_to_pkt(&pkt_udp_hdr, sizeof(pkt_udp_hdr), pkt,
- sizeof(struct ether_hdr) +
- sizeof(struct ipv4_hdr));
-
- /*
- * Complete first mbuf of packet and append it to the
- * burst of packets to be transmitted.
- */
- pkt->nb_segs = nb_segs;
- pkt->pkt_len = pkt_len;
- pkt->ol_flags = ol_flags;
- pkt->vlan_tci = vlan_tci;
- pkt->vlan_tci_outer = vlan_tci_outer;
- pkt->l2_len = sizeof(struct ether_hdr);
- pkt->l3_len = sizeof(struct ipv4_hdr);
pkts_burst[nb_pkt] = pkt;
}
+
+ if (nb_pkt == 0)
+ return;
+
nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue, pkts_burst, nb_pkt);
/*
* Retry if necessary
--
2.20.1
