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authorKlement Sekera <ksekera@cisco.com>2017-02-02 06:58:07 +0100
committerKlement Sekera <ksekera@cisco.com>2017-02-08 07:47:00 +0100
commita57a970952be2c3403c57dd7a16cd3d73660ef79 (patch)
tree89c0aab21b2c5f15d3b3cd355fb54c2c7ae7c66d /src/vnet/bfd/bfd_main.c
parent8ea6d7153b053f1b9bf837ef3a927136f44b41fd (diff)
BFD: modify session parameters
Change-Id: I666e5c0cc71a3693640960c93cdd1907f84fbe23 Signed-off-by: Klement Sekera <ksekera@cisco.com>
Diffstat (limited to 'src/vnet/bfd/bfd_main.c')
-rw-r--r--src/vnet/bfd/bfd_main.c296
1 files changed, 222 insertions, 74 deletions
diff --git a/src/vnet/bfd/bfd_main.c b/src/vnet/bfd/bfd_main.c
index 8f2fae2b795..798d0631dd7 100644
--- a/src/vnet/bfd/bfd_main.c
+++ b/src/vnet/bfd/bfd_main.c
@@ -30,11 +30,16 @@
#endif
static u64
-bfd_us_to_clocks (bfd_main_t * bm, u64 us)
+bfd_usec_to_clocks (const bfd_main_t * bm, u64 us)
{
return bm->cpu_cps * ((f64) us / USEC_PER_SECOND);
}
+// static u64 bfd_clocks_to_usec (const bfd_main_t *bm, u64 clocks)
+//{
+// return (clocks / bm->cpu_cps) * USEC_PER_SECOND;
+//}
+
static vlib_node_registration_t bfd_process_node;
/* set to 0 here, real values filled at startup */
@@ -83,9 +88,11 @@ bfd_set_defaults (bfd_main_t * bm, bfd_session_t * bs)
bs->remote_state = BFD_STATE_down;
bs->local_demand = 0;
bs->remote_discr = 0;
- bs->desired_min_tx_us = BFD_DEFAULT_DESIRED_MIN_TX_US;
- bs->desired_min_tx_clocks = bfd_us_to_clocks (bm, bs->desired_min_tx_us);
- bs->remote_min_rx_us = 1;
+ bs->config_desired_min_tx_usec = BFD_DEFAULT_DESIRED_MIN_TX_US;
+ bs->config_desired_min_tx_clocks = bm->default_desired_min_tx_clocks;
+ bs->effective_desired_min_tx_clocks = bm->default_desired_min_tx_clocks;
+ bs->remote_min_rx_usec = 1;
+ bs->remote_min_rx_clocks = bfd_usec_to_clocks (bm, bs->remote_min_rx_usec);
bs->remote_demand = 0;
bs->auth.remote_seq_number = 0;
bs->auth.remote_seq_number_known = 0;
@@ -123,7 +130,8 @@ bfd_recalc_tx_interval (bfd_main_t * bm, bfd_session_t * bs)
if (!bs->local_demand)
{
bs->transmit_interval_clocks =
- clib_max (bs->desired_min_tx_clocks, bs->remote_min_rx_clocks);
+ clib_max (bs->effective_desired_min_tx_clocks,
+ bs->remote_min_rx_clocks);
}
else
{
@@ -193,18 +201,18 @@ bfd_recalc_detection_time (bfd_main_t * bm, bfd_session_t * bs)
{
if (!bs->local_demand)
{
+ /* asynchronous mode */
bs->detection_time_clocks =
bs->remote_detect_mult *
- bfd_us_to_clocks (bm, clib_max (bs->required_min_rx_us,
- bs->remote_desired_min_tx_us));
+ clib_max (bs->effective_required_min_rx_clocks,
+ bs->remote_desired_min_tx_clocks);
}
else
{
+ /* demand mode */
bs->detection_time_clocks =
- bs->local_detect_mult *
- bfd_us_to_clocks (bm,
- clib_max (bs->desired_min_tx_us,
- bs->remote_min_rx_us));
+ bs->local_detect_mult * clib_max (bs->config_desired_min_tx_clocks,
+ bs->remote_min_rx_clocks);
}
BFD_DBG ("Recalculated detection time %lu clocks/%.2fs",
bs->detection_time_clocks,
@@ -259,14 +267,14 @@ bfd_set_timer (bfd_main_t * bm, bfd_session_t * bs, u64 now,
}
static void
-bfd_set_desired_min_tx (bfd_main_t * bm, bfd_session_t * bs, u64 now,
- u32 desired_min_tx_us, int handling_wakeup)
+bfd_set_effective_desired_min_tx (bfd_main_t * bm,
+ bfd_session_t * bs, u64 now,
+ u64 desired_min_tx_clocks,
+ int handling_wakeup)
{
- bs->desired_min_tx_us = desired_min_tx_us;
- bs->desired_min_tx_clocks = bfd_us_to_clocks (bm, bs->desired_min_tx_us);
- BFD_DBG ("Set desired min tx to %uus/%lu clocks/%.2fs",
- bs->desired_min_tx_us, bs->desired_min_tx_clocks,
- bs->desired_min_tx_clocks / bm->cpu_cps);
+ bs->effective_desired_min_tx_clocks = desired_min_tx_clocks;
+ BFD_DBG ("Set effective desired min tx to " BFD_CLK_FMT,
+ BFD_CLK_PRN (bs->effective_desired_min_tx_clocks));
bfd_recalc_detection_time (bm, bs);
bfd_recalc_tx_interval (bm, bs);
bfd_calc_next_tx (bm, bs, now);
@@ -274,15 +282,29 @@ bfd_set_desired_min_tx (bfd_main_t * bm, bfd_session_t * bs, u64 now,
}
static void
+bfd_set_effective_required_min_rx (bfd_main_t * bm,
+ bfd_session_t * bs, u64 now,
+ u64 required_min_rx_clocks,
+ int handling_wakeup)
+{
+ bs->effective_required_min_rx_clocks = required_min_rx_clocks;
+ BFD_DBG ("Set effective required min rx to " BFD_CLK_FMT,
+ BFD_CLK_PRN (bs->effective_required_min_rx_clocks));
+ bfd_recalc_detection_time (bm, bs);
+ bfd_set_timer (bm, bs, now, handling_wakeup);
+}
+
+static void
bfd_set_remote_required_min_rx (bfd_main_t * bm, bfd_session_t * bs,
u64 now,
- u32 remote_required_min_rx_us,
+ u32 remote_required_min_rx_usec,
int handling_wakeup)
{
- bs->remote_min_rx_us = remote_required_min_rx_us;
- bs->remote_min_rx_clocks = bfd_us_to_clocks (bm, bs->remote_min_rx_us);
- BFD_DBG ("Set remote min rx to %uus/%lu clocks/%.2fs", bs->remote_min_rx_us,
- bs->remote_min_rx_clocks, bs->remote_min_rx_clocks / bm->cpu_cps);
+ bs->remote_min_rx_usec = remote_required_min_rx_usec;
+ bs->remote_min_rx_clocks =
+ bfd_usec_to_clocks (bm, remote_required_min_rx_usec);
+ BFD_DBG ("Set remote min rx to " BFD_CLK_FMT,
+ BFD_CLK_PRN (bs->remote_min_rx_clocks));
bfd_recalc_detection_time (bm, bs);
bfd_recalc_tx_interval (bm, bs);
bfd_calc_next_tx (bm, bs, now);
@@ -316,32 +338,6 @@ bfd_del_session (uword bs_idx)
return 0;
}
-const char *
-bfd_diag_code_string (bfd_diag_code_e diag)
-{
-#define F(n, t, s) \
- case BFD_DIAG_CODE_NAME (t): \
- return s;
- switch (diag)
- {
- foreach_bfd_diag_code (F)}
- return "UNKNOWN";
-#undef F
-}
-
-const char *
-bfd_state_string (bfd_state_e state)
-{
-#define F(n, t, s) \
- case BFD_STATE_NAME (t): \
- return s;
- switch (state)
- {
- foreach_bfd_state (F)}
- return "UNKNOWN";
-#undef F
-}
-
void
bfd_session_set_flags (bfd_session_t * bs, u8 admin_up_down)
{
@@ -404,31 +400,63 @@ bfd_on_state_change (bfd_main_t * bm, bfd_session_t * bs, u64 now,
switch (bs->local_state)
{
case BFD_STATE_admin_down:
- bfd_set_desired_min_tx (bm, bs, now,
- clib_max (bs->config_desired_min_tx_us,
- BFD_DEFAULT_DESIRED_MIN_TX_US),
- handling_wakeup);
+ bfd_set_effective_required_min_rx (bm, bs, now,
+ bs->config_required_min_rx_clocks,
+ handling_wakeup);
+ bfd_set_effective_desired_min_tx (bm, bs, now,
+ clib_max
+ (bs->config_desired_min_tx_clocks,
+ bm->default_desired_min_tx_clocks),
+ handling_wakeup);
break;
case BFD_STATE_down:
- bfd_set_desired_min_tx (bm, bs, now,
- clib_max (bs->config_desired_min_tx_us,
- BFD_DEFAULT_DESIRED_MIN_TX_US),
- handling_wakeup);
+ bfd_set_effective_required_min_rx (bm, bs, now,
+ bs->config_required_min_rx_clocks,
+ handling_wakeup);
+ bfd_set_effective_desired_min_tx (bm, bs, now,
+ clib_max
+ (bs->config_desired_min_tx_clocks,
+ bm->default_desired_min_tx_clocks),
+ handling_wakeup);
break;
case BFD_STATE_init:
- bfd_set_desired_min_tx (bm, bs, now,
- clib_max (bs->config_desired_min_tx_us,
- BFD_DEFAULT_DESIRED_MIN_TX_US),
- handling_wakeup);
+ bfd_set_effective_desired_min_tx (bm, bs, now,
+ clib_max
+ (bs->config_desired_min_tx_clocks,
+ bm->default_desired_min_tx_clocks),
+ handling_wakeup);
break;
case BFD_STATE_up:
- bfd_set_desired_min_tx (bm, bs, now, bs->config_desired_min_tx_us,
- handling_wakeup);
+ if (POLL_NOT_NEEDED == bs->poll_state)
+ {
+ bfd_set_effective_required_min_rx (bm, bs, now,
+ bs->config_required_min_rx_clocks,
+ handling_wakeup);
+ }
+ bfd_set_effective_desired_min_tx (bm, bs, now,
+ bs->config_desired_min_tx_clocks,
+ handling_wakeup);
break;
}
}
static void
+bfd_on_config_change (vlib_main_t * vm, vlib_node_runtime_t * rt,
+ bfd_main_t * bm, bfd_session_t * bs, u64 now)
+{
+ if (bs->remote_demand)
+ {
+ /* TODO - initiate poll sequence here */
+ }
+ else
+ {
+ /* asynchronous - poll is part of periodic - nothing to do here */
+ }
+ bfd_recalc_detection_time (bm, bs);
+ bfd_set_timer (bm, bs, now, 0);
+}
+
+static void
bfd_add_transport_layer (vlib_main_t * vm, vlib_buffer_t * b,
bfd_session_t * bs)
{
@@ -557,11 +585,10 @@ bfd_init_control_frame (vlib_buffer_t * b, bfd_session_t * bs)
pkt->head.length = clib_host_to_net_u32 (bfd_length);
pkt->my_disc = bs->local_discr;
pkt->your_disc = bs->remote_discr;
- pkt->des_min_tx = clib_host_to_net_u32 (bs->desired_min_tx_us);
- pkt->req_min_rx = clib_host_to_net_u32 (bs->required_min_rx_us);
- pkt->req_min_echo_rx = clib_host_to_net_u32 (bs->required_min_echo_rx_us);
+ pkt->des_min_tx = clib_host_to_net_u32 (bs->config_desired_min_tx_usec);
+ pkt->req_min_rx = clib_host_to_net_u32 (bs->config_required_min_rx_usec);
+ pkt->req_min_echo_rx = clib_host_to_net_u32 (1);
b->current_length = bfd_length;
- bfd_add_auth_section (b, bs);
}
static void
@@ -569,7 +596,7 @@ bfd_send_periodic (vlib_main_t * vm, vlib_node_runtime_t * rt,
bfd_main_t * bm, bfd_session_t * bs, u64 now,
int handling_wakeup)
{
- if (!bs->remote_min_rx_us)
+ if (!bs->remote_min_rx_usec)
{
BFD_DBG
("bfd.RemoteMinRxInterval is zero, not sending periodic control "
@@ -593,6 +620,14 @@ bfd_send_periodic (vlib_main_t * vm, vlib_node_runtime_t * rt,
return;
}
bfd_init_control_frame (b, bs);
+ if (POLL_NOT_NEEDED != bs->poll_state)
+ {
+ /* here we are either beginning a new poll sequence or retrying .. */
+ bfd_pkt_set_poll (vlib_buffer_get_current (b));
+ bs->poll_state = POLL_IN_PROGRESS;
+ BFD_DBG ("Setting poll bit in packet, bs_idx=%u", bs->bs_idx);
+ }
+ bfd_add_auth_section (b, bs);
bfd_add_transport_layer (vm, b, bs);
bs->last_tx_clocks = now;
bfd_calc_next_tx (bm, bs, now);
@@ -613,8 +648,14 @@ bfd_init_final_control_frame (vlib_main_t * vm, vlib_buffer_t * b,
BFD_DBG ("Send final control frame for bs_idx=%lu", bs->bs_idx);
bfd_init_control_frame (b, bs);
bfd_pkt_set_final (vlib_buffer_get_current (b));
+ bfd_add_auth_section (b, bs);
bfd_add_transport_layer (vm, b, bs);
bs->last_tx_clocks = clib_cpu_time_now ();
+ /*
+ * RFC allows to include changes in final frame, so if there were any
+ * pending, we already did that, thus we can clear any pending poll needs
+ */
+ bs->poll_state = POLL_NOT_NEEDED;
}
static void
@@ -629,6 +670,14 @@ bfd_check_rx_timeout (bfd_main_t * bm, bfd_session_t * bs, u64 now,
BFD_DBG ("Rx timeout, session goes down");
bfd_set_diag (bs, BFD_DIAG_CODE_det_time_exp);
bfd_set_state (bm, bs, BFD_STATE_down, handling_wakeup);
+ /*
+ * If the remote system does not receive any
+ * BFD Control packets for a Detection Time, it SHOULD reset
+ * bfd.RemoteMinRxInterval to its initial value of 1 (per section 6.8.1,
+ * since it is no longer required to maintain previous session state)
+ * and then can transmit at its own rate.
+ */
+ bfd_set_remote_required_min_rx (bm, bs, now, 1, handling_wakeup);
}
}
@@ -722,6 +771,19 @@ bfd_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
(u32) * event_data);
}
break;
+ case BFD_EVENT_CONFIG_CHANGED:
+ if (!pool_is_free_index (bm->sessions, *event_data))
+ {
+ bfd_session_t *bs =
+ pool_elt_at_index (bm->sessions, *event_data);
+ bfd_on_config_change (vm, rt, bm, bs, now);
+ }
+ else
+ {
+ BFD_DBG ("Ignoring event for non-existent session index %u",
+ (u32) * event_data);
+ }
+ break;
default:
clib_warning ("BUG: event type 0x%wx", event_type);
break;
@@ -810,6 +872,8 @@ bfd_main_init (vlib_main_t * vm)
memset (&bm->wheel, 0, sizeof (bm->wheel));
bm->cpu_cps = vm->clib_time.clocks_per_second;
BFD_DBG ("cps is %.2f", bm->cpu_cps);
+ bm->default_desired_min_tx_clocks =
+ bfd_usec_to_clocks (bm, BFD_DEFAULT_DESIRED_MIN_TX_US);
const u64 now = clib_cpu_time_now ();
timing_wheel_init (&bm->wheel, now, bm->cpu_cps);
bm->wheel_inaccuracy = 2 << bm->wheel.log2_clocks_per_bin;
@@ -1283,7 +1347,8 @@ bfd_consume_pkt (bfd_main_t * bm, const bfd_pkt_t * pkt, u32 bs_idx)
while (0);
}
}
- bs->remote_desired_min_tx_us = clib_net_to_host_u32 (pkt->des_min_tx);
+ bs->remote_desired_min_tx_clocks =
+ bfd_usec_to_clocks (bm, clib_net_to_host_u32 (pkt->des_min_tx));
bs->remote_detect_mult = pkt->head.detect_mult;
bfd_set_remote_required_min_rx (bm, bs, now,
clib_net_to_host_u32 (pkt->req_min_rx), 0);
@@ -1297,6 +1362,18 @@ bfd_consume_pkt (bfd_main_t * bm, const bfd_pkt_t * pkt, u32 bs_idx)
*/
/* FIXME 6.8.2 */
/* FIXME 6.8.4 */
+ if (bs->poll_state == POLL_IN_PROGRESS && bfd_pkt_get_final (pkt))
+ {
+ bs->poll_state = POLL_NOT_NEEDED;
+ BFD_DBG ("Poll sequence terminated, bs_idx=%u", bs->bs_idx);
+ if (BFD_STATE_up == bs->local_state)
+ {
+ bfd_set_effective_required_min_rx (bm, bs, now,
+ bs->config_required_min_rx_clocks,
+ 0);
+ bfd_recalc_detection_time (bm, bs);
+ }
+ }
if (BFD_STATE_admin_down == bs->local_state)
return;
if (BFD_STATE_admin_down == bs->remote_state)
@@ -1333,6 +1410,20 @@ bfd_consume_pkt (bfd_main_t * bm, const bfd_pkt_t * pkt, u32 bs_idx)
}
}
+static const char *
+bfd_poll_state_string (bfd_poll_state_e state)
+{
+ switch (state)
+ {
+#define F(x) \
+ case POLL_##x: \
+ return "POLL_" #x;
+ foreach_bfd_poll_state (F)
+#undef F
+ }
+ return "UNKNOWN";
+}
+
u8 *
format_bfd_session (u8 * s, va_list * args)
{
@@ -1353,17 +1444,18 @@ format_bfd_session (u8 * s, va_list * args)
"remote-seq-num=%u, "
"is-delayed=%s, "
"curr-key=%U, "
- "next-key=%U}",
+ "next-key=%U},"
+ "poll-state: %s",
bs->bs_idx, bfd_state_string (bs->local_state),
bfd_state_string (bs->remote_state), bs->local_discr,
bs->remote_discr, bfd_diag_code_string (bs->local_diag),
- bs->desired_min_tx_us, bs->required_min_rx_us,
- bs->required_min_echo_rx_us, bs->remote_min_rx_us,
- (bs->local_demand ? "yes" : "no"),
+ bs->config_desired_min_tx_usec, bs->config_required_min_rx_usec,
+ 1, bs->remote_min_rx_usec, (bs->local_demand ? "yes" : "no"),
(bs->remote_demand ? "yes" : "no"), bs->local_detect_mult,
bs->auth.local_seq_number, bs->auth.remote_seq_number,
(bs->auth.is_delayed ? "yes" : "no"), format_bfd_auth_key,
- bs->auth.curr_key, format_bfd_auth_key, bs->auth.next_key);
+ bs->auth.curr_key, format_bfd_auth_key, bs->auth.next_key,
+ bfd_poll_state_string (bs->poll_state));
return s;
}
@@ -1462,6 +1554,62 @@ bfd_auth_deactivate (bfd_session_t * bs, u8 is_delayed)
#endif
}
+vnet_api_error_t
+bfd_session_set_params (bfd_main_t * bm, bfd_session_t * bs,
+ u32 desired_min_tx_usec,
+ u32 required_min_rx_usec, u8 detect_mult)
+{
+ if (bs->local_detect_mult != detect_mult ||
+ bs->config_desired_min_tx_usec != desired_min_tx_usec ||
+ bs->config_required_min_rx_usec != required_min_rx_usec)
+ {
+ BFD_DBG ("Changing session params: %U", format_bfd_session, bs);
+ switch (bs->poll_state)
+ {
+ case POLL_NOT_NEEDED:
+ if (BFD_STATE_up == bs->local_state ||
+ BFD_STATE_init == bs->local_state)
+ {
+ /* poll sequence is not needed for detect multiplier change */
+ if (bs->config_desired_min_tx_usec != desired_min_tx_usec ||
+ bs->config_required_min_rx_usec != required_min_rx_usec)
+ {
+ bs->poll_state = POLL_NEEDED;
+ BFD_DBG ("Set poll state=%s, bs_idx=%u",
+ bfd_poll_state_string (bs->poll_state),
+ bs->bs_idx);
+ }
+ }
+ break;
+ case POLL_NEEDED:
+ /* nothing to do */
+ break;
+ case POLL_IN_PROGRESS:
+ /* can't change params now ... */
+ BFD_ERR ("Poll in progress, cannot change params for session with "
+ "bs_idx=%u", bs->bs_idx);
+ return VNET_API_ERROR_BFD_EAGAIN;
+ }
+
+ bs->local_detect_mult = detect_mult;
+ bs->config_desired_min_tx_usec = desired_min_tx_usec;
+ bs->config_desired_min_tx_clocks =
+ bfd_usec_to_clocks (bm, desired_min_tx_usec);
+ bs->config_required_min_rx_usec = required_min_rx_usec;
+ bs->config_required_min_rx_clocks =
+ bfd_usec_to_clocks (bm, required_min_rx_usec);
+ BFD_DBG ("Changed session params: %U", format_bfd_session, bs);
+
+ vlib_process_signal_event (bm->vlib_main, bm->bfd_process_node_index,
+ BFD_EVENT_CONFIG_CHANGED, bs->bs_idx);
+ }
+ else
+ {
+ BFD_DBG ("Ignore parameter change - no change, bs_idx=%u", bs->bs_idx);
+ }
+ return 0;
+}
+
bfd_main_t bfd_main;
/*