eventdev/eth_rx: use timestamp as dynamic mbuf field

Add support to register timestamp dynamic field in mbuf.

Update the timestamp in mbuf for each packet before enqueuing
to event device if the timestamp is not already set.

Adding the timestamp in Rx adapter avoids additional latency
due to the event device.

Signed-off-by: Ganapati Kundapura <ganapati.kundapura@intel.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>

diff --git a/lib/eventdev/rte_event_eth_rx_adapter.c b/lib/eventdev/rte_event_eth_rx_adapter.c
index cc93fcc..25595af 100644 (file)
--- a/lib/eventdev/rte_event_eth_rx_adapter.c
+++ b/lib/eventdev/rte_event_eth_rx_adapter.c
@@ -17,6 +17,7 @@
 #include <rte_service_component.h>
 #include <rte_thash.h>
 #include <rte_interrupts.h>
+#include <rte_mbuf_dyn.h>
 
 #include "rte_eventdev.h"
 #include "eventdev_pmd.h"
@@ -240,6 +241,17 @@ struct eth_rx_queue_info {
 
 static struct rte_event_eth_rx_adapter **event_eth_rx_adapter;
 
+/* Enable dynamic timestamp field in mbuf */
+static uint64_t event_eth_rx_timestamp_dynflag;
+static int event_eth_rx_timestamp_dynfield_offset = -1;
+
+static inline rte_mbuf_timestamp_t *
+rxa_timestamp_dynfield(struct rte_mbuf *mbuf)
+{
+       return RTE_MBUF_DYNFIELD(mbuf,
+               event_eth_rx_timestamp_dynfield_offset, rte_mbuf_timestamp_t *);
+}
+
 static inline int
 rxa_validate_id(uint8_t id)
 {
@@ -890,8 +902,18 @@ rxa_buffer_mbufs(struct rte_event_eth_rx_adapter *rx_adapter,
        int do_rss;
        uint16_t nb_cb;
        uint16_t dropped;
+       uint64_t ts, ts_mask;
 
        if (!eth_rx_queue_info->ena_vector) {
+               ts = m->ol_flags & event_eth_rx_timestamp_dynflag ?
+                                               0 : rte_get_tsc_cycles();
+
+               /* 0xffff ffff ffff ffff if PKT_RX_TIMESTAMP is set,
+                * otherwise 0
+                */
+               ts_mask = (uint64_t)(!(m->ol_flags &
+                                      event_eth_rx_timestamp_dynflag)) - 1ULL;
+
                /* 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;
@@ -899,6 +921,9 @@ rxa_buffer_mbufs(struct rte_event_eth_rx_adapter *rx_adapter,
                        struct rte_event *ev;
 
                        m = mbufs[i];
+                       *rxa_timestamp_dynfield(m) = ts |
+                                       (*rxa_timestamp_dynfield(m) & ts_mask);
+
                        ev = &buf->events[new_tail];
 
                        rss = do_rss ? rxa_do_softrss(m, rx_adapter->rss_key_be)
@@ -2238,6 +2263,14 @@ rte_event_eth_rx_adapter_create_ext(uint8_t id, uint8_t dev_id,
        event_eth_rx_adapter[id] = rx_adapter;
        if (conf_cb == rxa_default_conf_cb)
                rx_adapter->default_cb_arg = 1;
+
+       if (rte_mbuf_dyn_rx_timestamp_register(
+                       &event_eth_rx_timestamp_dynfield_offset,
+                       &event_eth_rx_timestamp_dynflag) != 0) {
+               RTE_EDEV_LOG_ERR("Error registering timestamp field in mbuf\n");
+               return -rte_errno;
+       }
+
        rte_eventdev_trace_eth_rx_adapter_create(id, dev_id, conf_cb,
                conf_arg);
        return 0;