examples/rxtx_callbacks: switch TSC to dynamic field

The example used the deprecated mbuf field udata64.
It is moved to a dynamic field in order to allow removal of udata64.

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>

diff --git a/doc/guides/sample_app_ug/rxtx_callbacks.rst b/doc/guides/sample_app_ug/rxtx_callbacks.rst
index 62d1f39..3444462 100644 (file)
--- a/doc/guides/sample_app_ug/rxtx_callbacks.rst
+++ b/doc/guides/sample_app_ug/rxtx_callbacks.rst
@@ -152,7 +152,7 @@ all packets received:
         uint64_t now = rte_rdtsc();
 
         for (i = 0; i < nb_pkts; i++)
-            pkts[i]->udata64 = now;
+            *tsc_field(pkts[i]) = now;
 
         return nb_pkts;
     }
@@ -179,7 +179,7 @@ packets prior to transmission:
         unsigned i;
 
         for (i = 0; i < nb_pkts; i++)
-            cycles += now - pkts[i]->udata64;
+            cycles += now - *tsc_field(pkts[i]);
 
         latency_numbers.total_cycles += cycles;
         latency_numbers.total_pkts   += nb_pkts;

diff --git a/examples/rxtx_callbacks/main.c b/examples/rxtx_callbacks/main.c
index 6fe3954..1a8e7d4 100644 (file)
--- a/examples/rxtx_callbacks/main.c
+++ b/examples/rxtx_callbacks/main.c
@@ -10,6 +10,7 @@
 #include <rte_cycles.h>
 #include <rte_lcore.h>
 #include <rte_mbuf.h>
+#include <rte_mbuf_dyn.h>
 
 #define RX_RING_SIZE 1024
 #define TX_RING_SIZE 1024
@@ -18,6 +19,15 @@
 #define MBUF_CACHE_SIZE 250
 #define BURST_SIZE 32
 
+typedef uint64_t tsc_t;
+static int tsc_dynfield_offset = -1;
+
+static inline tsc_t *
+tsc_field(struct rte_mbuf *mbuf)
+{
+       return RTE_MBUF_DYNFIELD(mbuf, tsc_dynfield_offset, tsc_t *);
+}
+
 static const char usage[] =
        "%s EAL_ARGS -- [-t]\n";
 
@@ -47,7 +57,7 @@ add_timestamps(uint16_t port __rte_unused, uint16_t qidx __rte_unused,
        uint64_t now = rte_rdtsc();
 
        for (i = 0; i < nb_pkts; i++)
-               pkts[i]->udata64 = now;
+               *tsc_field(pkts[i]) = now;
        return nb_pkts;
 }
 
@@ -65,7 +75,7 @@ calc_latency(uint16_t port, uint16_t qidx __rte_unused,
                rte_eth_read_clock(port, &ticks);
 
        for (i = 0; i < nb_pkts; i++) {
-               cycles += now - pkts[i]->udata64;
+               cycles += now - *tsc_field(pkts[i]);
                if (hw_timestamping)
                        queue_ticks += ticks - pkts[i]->timestamp;
        }
@@ -261,6 +271,11 @@ main(int argc, char *argv[])
        };
        int opt, option_index;
 
+       static const struct rte_mbuf_dynfield tsc_dynfield_desc = {
+               .name = "example_bbdev_dynfield_tsc",
+               .size = sizeof(tsc_t),
+               .align = __alignof__(tsc_t),
+       };
 
        /* init EAL */
        int ret = rte_eal_init(argc, argv);
@@ -292,6 +307,11 @@ main(int argc, char *argv[])
        if (mbuf_pool == NULL)
                rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n");
 
+       tsc_dynfield_offset =
+               rte_mbuf_dynfield_register(&tsc_dynfield_desc);
+       if (tsc_dynfield_offset < 0)
+               rte_exit(EXIT_FAILURE, "Cannot register mbuf field\n");
+
        /* initialize all ports */
        RTE_ETH_FOREACH_DEV(portid)
                if (port_init(portid, mbuf_pool) != 0)