diff options
| author |   Xavier Simonart <xavier.simonart@intel.com> | 2018-04-11 16:15:55 +0200 |
|---|---|---|
| committer |   Patrice Buriez <patrice.buriez@intel.com> | 2018-04-17 16:28:09 +0000 |
| commit | 4a65cd849c252ac401e22debe2012d3cf48701fc (patch) | |
| tree | f0bbc50f533aba6c6afe23684e07fd8516c7d86e /VNFs/DPPD-PROX/handle_lat.c | |
| parent | 3981ce6fed44db09af235100526ab8bc1666e38e (diff) | |
Fix link speed when link is down at startup.
When link is down at startup, the link_speed returned by DPDK
is 0. This results in un-optimized latency estimates in gen and lat.
With this fix, lat and gen do nothing until link_speed is
properly initialized, and use the right link speed in the fast path.
Change-Id: Id2d14b6966ccfac7cc78db3c5a74e704b42edae7
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
Diffstat (limited to 'VNFs/DPPD-PROX/handle_lat.c')
| -rw-r--r-- | VNFs/DPPD-PROX/handle_lat.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/VNFs/DPPD-PROX/handle_lat.c b/VNFs/DPPD-PROX/handle_lat.c index 1fa44137..8cc5c32b 100644 --- a/VNFs/DPPD-PROX/handle_lat.c +++ b/VNFs/DPPD-PROX/handle_lat.c @@ -520,6 +520,16 @@ static int handle_lat_bulk(struct task_base *tbase, struct rte_mbuf **mbufs, uin uint32_t pkt_rx_time, pkt_tx_time; + // If link is down, link_speed is 0 + if (unlikely(task->link_speed == 0)) { + if (task->port && task->port->link_speed != 0) { + task->link_speed = task->port->link_speed * 125000L; + plog_info("\tPort %u: link speed is %ld Mbps\n", + (uint8_t)(task->port - prox_port_cfg), 8 * task->link_speed / 1000000); + } else + return 0; + } + if (n_pkts == 0) { task->begin = tbase->aux->tsc_rx.before; return 0; @@ -688,11 +698,17 @@ static void lat_start(struct task_base *tbase) { struct task_lat *task = (struct task_lat *)tbase; - if (task->port && task->port->link_speed) { - // task->port->link->speed reports the link speed in Mbps e.g. 40k for a 40 Gbps NIC - // task->link_speed reported link speed in Bytes per sec. + if (task->port) { + // task->port->link_speed reports the link speed in Mbps e.g. 40k for a 40 Gbps NIC. + // task->link_speed reports link speed in Bytes per sec. + // It can be 0 if link is down, and must hence be updated in fast path. task->link_speed = task->port->link_speed * 125000L; - plog_info("\tReceiving at %lu Mbps\n", 8 * task->link_speed / 1000000); + if (task->link_speed) + plog_info("\tPort %u: link speed is %ld Mbps\n", + (uint8_t)(task->port - prox_port_cfg), 8 * task->link_speed / 1000000); + else + plog_info("\tPort %u: link speed is %ld Mbps - link might be down\n", + (uint8_t)(task->port - prox_port_cfg), 8 * task->link_speed / 1000000); } } |