#include <nat/nat44/ed_inlines.h>
#include <nat/lib/nat_inlines.h>
+/* number of attempts to get a port for ED overloading algorithm, if rolling
+ * a dice this many times doesn't produce a free port, it's treated
+ * as if there were no free ports available to conserve resources */
+#define ED_PORT_ALLOC_ATTEMPTS (10)
+
static char *nat_in2out_ed_error_strings[] = {
#define _(sym,string) string,
foreach_nat_in2out_ed_error
if (a->fib_index == rx_fib_index) \
{ \
/* first try port suggested by caller */ \
- u16 port = clib_net_to_host_u16 (*outside_port); \
+ u16 port = clib_net_to_host_u16 (*outside_port); \
u16 port_offset = port - port_thread_offset; \
if (port <= port_thread_offset || \
port > port_thread_offset + port_per_thread) \
{ \
/* need to pick a different port, suggested port doesn't fit in \
* this thread's port range */ \
- port_offset = snat_random_port (1, port_per_thread); \
+ port_offset = snat_random_port (0, port_per_thread - 1); \
port = port_thread_offset + port_offset; \
} \
- u16 attempts = port_per_thread; \
+ u16 attempts = ED_PORT_ALLOC_ATTEMPTS; \
do \
{ \
init_ed_kv (out2in_ed_kv, a->addr, clib_host_to_net_u16 (port), \
++a->busy_##n##_port_refcounts[port]; \
a->busy_##n##_ports_per_thread[thread_index]++; \
a->busy_##n##_ports++; \
- *outside_addr = a->addr; \
- *outside_port = clib_host_to_net_u16 (port); \
+ *outside_addr = a->addr; \
+ *outside_port = clib_host_to_net_u16 (port); \
return 0; \
} \
- port_offset = (port_offset + 1) % port_per_thread; \
+ port_offset = snat_random_port (0, port_per_thread - 1); \
port = port_thread_offset + port_offset; \
--attempts; \
} \
ip_csum_t sum0;
b0 = *b;
+ b++;
+
+ /* Prefetch next iteration. */
+ if (PREDICT_TRUE (n_left_from >= 2))
+ {
+ vlib_buffer_t *p2;
+
+ p2 = *b;
+
+ vlib_prefetch_buffer_header (p2, LOAD);
+
+ CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, LOAD);
+ }
if (is_output_feature)
{
n_left_from--;
next++;
- b++;
}
vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,