From: Nikhil Rao Date: Tue, 20 Feb 2018 11:30:54 +0000 (-0500) Subject: eventdev: add Rx timestamp X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=569758758dcd9bece5f2cc079f7e427a227040cd;p=dpdk.git eventdev: add Rx timestamp Add timestamp to received packets before enqueuing to event device if the timestamp is not already set. Adding timestamp in the Rx adapter avoids additional latency due to the event device. Signed-off-by: Nikhil Rao Acked-by: Jerin Jacob --- diff --git a/doc/guides/prog_guide/event_ethernet_rx_adapter.rst b/doc/guides/prog_guide/event_ethernet_rx_adapter.rst index 4ab87a37e4..319e4f0557 100644 --- a/doc/guides/prog_guide/event_ethernet_rx_adapter.rst +++ b/doc/guides/prog_guide/event_ethernet_rx_adapter.rst @@ -12,7 +12,11 @@ be supported in hardware or require a software thread to receive packets from the ethdev port using ethdev poll mode APIs and enqueue these as events to the event device using the eventdev API. Both transfer mechanisms may be present on the same platform depending on the particular combination of the ethdev and -the event device. +the event device. For SW based packet transfer, if the mbuf does not have a +timestamp set, the adapter adds a timestamp to the mbuf using +rte_get_tsc_cycles(), this provides a more accurate timestamp as compared to +if the application were to set the timestamp since it avoids event device +schedule latency. The Event Ethernet Rx Adapter library is intended for the application code to configure both transfer mechanisms using a common API. A capability API allows diff --git a/lib/librte_eventdev/rte_event_eth_rx_adapter.c b/lib/librte_eventdev/rte_event_eth_rx_adapter.c index 9aece9f8c3..9cda9607b1 100644 --- a/lib/librte_eventdev/rte_event_eth_rx_adapter.c +++ b/lib/librte_eventdev/rte_event_eth_rx_adapter.c @@ -434,11 +434,22 @@ fill_event_buffer(struct rte_event_eth_rx_adapter *rx_adapter, uint32_t rss_mask; uint32_t rss; int do_rss; + uint64_t ts; /* 0xffff ffff if PKT_RX_RSS_HASH is set, otherwise 0 */ rss_mask = ~(((m->ol_flags & PKT_RX_RSS_HASH) != 0) - 1); do_rss = !rss_mask && !eth_rx_queue_info->flow_id_mask; + if ((m->ol_flags & PKT_RX_TIMESTAMP) == 0) { + ts = rte_get_tsc_cycles(); + for (i = 0; i < num; i++) { + m = mbufs[i]; + + m->timestamp = ts; + m->ol_flags |= PKT_RX_TIMESTAMP; + } + } + for (i = 0; i < num; i++) { m = mbufs[i]; struct rte_event *ev = &events[i]; @@ -449,7 +460,6 @@ fill_event_buffer(struct rte_event_eth_rx_adapter *rx_adapter, eth_rx_queue_info->flow_id & eth_rx_queue_info->flow_id_mask; flow_id |= rss & ~eth_rx_queue_info->flow_id_mask; - ev->flow_id = flow_id; ev->op = RTE_EVENT_OP_NEW; ev->sched_type = sched_type; diff --git a/lib/librte_eventdev/rte_event_eth_rx_adapter.h b/lib/librte_eventdev/rte_event_eth_rx_adapter.h index c20507b23f..fc9da147f5 100644 --- a/lib/librte_eventdev/rte_event_eth_rx_adapter.h +++ b/lib/librte_eventdev/rte_event_eth_rx_adapter.h @@ -47,7 +47,11 @@ * * The adapter uses a EAL service core function for SW based packet transfer * and uses the eventdev PMD functions to configure HW based packet transfer - * between the ethernet device and the event device. + * between the ethernet device and the event device. For SW based packet + * transfer, if the mbuf does not have a timestamp set, the adapter adds a + * timestamp to the mbuf using rte_get_tsc_cycles(), this provides a more + * accurate timestamp as compared to if the application were to set the time + * stamp since it avoids event device schedule latency. * * The ethernet Rx event adapter's functions are: * - rte_event_eth_rx_adapter_create_ext()