diff options
| author |   Florin Coras <fcoras@cisco.com> | 2017-11-27 04:34:14 -0500 |
|---|---|---|
| committer |   Dave Barach <openvpp@barachs.net> | 2017-11-28 13:21:26 +0000 |
| commit | f988e696149f42828444c69762c036d9684b6bb0 (patch) | |
| tree | 8e62fbd53a713e64be7c0441f0399aa023a949d8 /src/vnet/tcp/tcp_debug.h | |
| parent | af6f93a4eb4740ac13b1d65eb44da442976fa809 (diff) | |
tcp: fix retransmissions under buffer shortage
- add debugging scaffolding for simulating buffer shortage
Change-Id: Ice519d74f9c4e4094c4586c548185135b7bb5f2d
Signed-off-by: Florin Coras <fcoras@cisco.com>
Diffstat (limited to 'src/vnet/tcp/tcp_debug.h')
| -rwxr-xr-x | src/vnet/tcp/tcp_debug.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/vnet/tcp/tcp_debug.h b/src/vnet/tcp/tcp_debug.h index eb318cde4b9..5d4f7d6879d 100755 --- a/src/vnet/tcp/tcp_debug.h +++ b/src/vnet/tcp/tcp_debug.h @@ -22,6 +22,7 @@ #define TCP_DEBUG_SM (0) #define TCP_DEBUG_CC (0) #define TCP_DEBUG_CC_STAT (1) +#define TCP_DEBUG_BUFFER_ALLOCATION (0) #define foreach_tcp_dbg_evt \ _(INIT, "") \ @@ -747,6 +748,39 @@ if (_tc->c_cc_stat_tstamp + STATS_INTERVAL < tcp_time_now()) \ } \ } +/* + * Buffer allocation + */ +#if TCP_DEBUG_BUFFER_ALLOCATION + +#define TCP_DBG_BUFFER_ALLOC_MAYBE_FAIL(thread_index) \ +{ \ + static u32 *buffer_fail_counters; \ + if (PREDICT_FALSE (buffer_fail_counters == 0)) \ + { \ + u32 num_threads; \ + vlib_thread_main_t *vtm = vlib_get_thread_main (); \ + num_threads = 1 /* main thread */ + vtm->n_threads; \ + vec_validate (buffer_fail_counters, num_threads - 1); \ + } \ + if (PREDICT_FALSE (tcp_main.buffer_fail_fraction != 0.0)) \ + { \ + if (PREDICT_TRUE (buffer_fail_counters[thread_index] > 0)) \ + { \ + if ((1.0 / (f32) (buffer_fail_counters[thread_index])) \ + < tcp_main.buffer_fail_fraction) \ + { \ + buffer_fail_counters[thread_index] = 0.0000001; \ + return -1; \ + } \ + } \ + buffer_fail_counters[thread_index] ++; \ + } \ +} +#else +#define TCP_DBG_BUFFER_ALLOC_MAYBE_FAIL(thread_index) +#endif + #else #define TCP_EVT_CC_STAT_HANDLER(_tc, ...) #endif |