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bgpd: update atomic memory orders

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Use best-performing memory orders where appropriate.
Also update some style and add missing comments.

Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>
This commit is contained in:
Quentin Young 2017-07-05 11:38:57 -04:00
parent 152456fe23
commit 1588f6f441
No known key found for this signature in database
GPG Key ID: DAF48E0F57E0834F
2 changed files with 77 additions and 65 deletions
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70
bgpd/bgp_io.c
View File

@ -61,10 +61,8 @@ void bgp_io_init()
bgp_io_thread_started = false;
}
static int bgp_io_dummy(struct thread *thread)
{
return 0;
}
/* Unused callback for thread_add_read() */
static int bgp_io_dummy(struct thread *thread) { return 0; }
void *bgp_io_start(void *arg)
{
@ -81,9 +79,9 @@ void *bgp_io_start(void *arg)
struct thread task;
atomic_store_explicit(&bgp_io_thread_run, true, memory_order_relaxed);
atomic_store_explicit(&bgp_io_thread_run, true, memory_order_seq_cst);
atomic_store_explicit(&bgp_io_thread_started, true,
memory_order_relaxed);
memory_order_seq_cst);
while (bgp_io_thread_run) {
if (thread_fetch(fpt->master, &task)) {
@ -99,7 +97,7 @@ void *bgp_io_start(void *arg)
static int bgp_io_finish(struct thread *thread)
{
atomic_store_explicit(&bgp_io_thread_run, false, memory_order_relaxed);
atomic_store_explicit(&bgp_io_thread_run, false, memory_order_seq_cst);
return 0;
}
@ -114,8 +112,8 @@ int bgp_io_stop(void **result, struct frr_pthread *fpt)
void bgp_writes_on(struct peer *peer)
{
while (!atomic_load_explicit(&bgp_io_thread_started,
memory_order_relaxed))
while (
!atomic_load_explicit(&bgp_io_thread_started, memory_order_seq_cst))
;
assert(peer->status != Deleted);
@ -134,8 +132,8 @@ void bgp_writes_on(struct peer *peer)
void bgp_writes_off(struct peer *peer)
{
while (!atomic_load_explicit(&bgp_io_thread_started,
memory_order_relaxed))
while (
!atomic_load_explicit(&bgp_io_thread_started, memory_order_seq_cst))
;
struct frr_pthread *fpt = frr_pthread_get(PTHREAD_IO);
@ -148,8 +146,8 @@ void bgp_writes_off(struct peer *peer)
void bgp_reads_on(struct peer *peer)
{
while (!atomic_load_explicit(&bgp_io_thread_started,
memory_order_relaxed))
while (
!atomic_load_explicit(&bgp_io_thread_started, memory_order_seq_cst))
;
assert(peer->status != Deleted);
@ -171,8 +169,8 @@ void bgp_reads_on(struct peer *peer)
void bgp_reads_off(struct peer *peer)
{
while (!atomic_load_explicit(&bgp_io_thread_started,
memory_order_relaxed))
while (
!atomic_load_explicit(&bgp_io_thread_started, memory_order_seq_cst))
;
struct frr_pthread *fpt = frr_pthread_get(PTHREAD_IO);
@ -376,8 +374,8 @@ static uint16_t bgp_write(struct peer *peer)
uint32_t wpkt_quanta_old;
// cache current write quanta
wpkt_quanta_old = atomic_load_explicit(&peer->bgp->wpkt_quanta,
memory_order_relaxed);
wpkt_quanta_old =
atomic_load_explicit(&peer->bgp->wpkt_quanta, memory_order_relaxed);
while (count < wpkt_quanta_old && (s = stream_fifo_head(peer->obuf))) {
int writenum;
@ -405,13 +403,16 @@ static uint16_t bgp_write(struct peer *peer)
switch (type) {
case BGP_MSG_OPEN:
peer->open_out++;
atomic_fetch_add_explicit(&peer->open_out, 1,
memory_order_relaxed);
break;
case BGP_MSG_UPDATE:
peer->update_out++;
atomic_fetch_add_explicit(&peer->update_out, 1,
memory_order_relaxed);
break;
case BGP_MSG_NOTIFY:
peer->notify_out++;
atomic_fetch_add_explicit(&peer->notify_out, 1,
memory_order_relaxed);
/* Double start timer. */
peer->v_start *= 2;
@ -427,14 +428,17 @@ static uint16_t bgp_write(struct peer *peer)
goto done;
case BGP_MSG_KEEPALIVE:
peer->keepalive_out++;
atomic_fetch_add_explicit(&peer->keepalive_out, 1,
memory_order_relaxed);
break;
case BGP_MSG_ROUTE_REFRESH_NEW:
case BGP_MSG_ROUTE_REFRESH_OLD:
peer->refresh_out++;
atomic_fetch_add_explicit(&peer->refresh_out, 1,
memory_order_relaxed);
break;
case BGP_MSG_CAPABILITY:
peer->dynamic_cap_out++;
atomic_fetch_add_explicit(&peer->dynamic_cap_out, 1,
memory_order_relaxed);
break;
}
@ -447,11 +451,13 @@ static uint16_t bgp_write(struct peer *peer)
done : {
/* Update last_update if UPDATEs were written. */
if (peer->update_out > oc)
peer->last_update = bgp_clock();
atomic_store_explicit(&peer->last_update, bgp_clock(),
memory_order_relaxed);
/* If we TXed any flavor of packet update last_write */
if (update_last_write)
peer->last_write = bgp_clock();
atomic_store_explicit(&peer->last_write, bgp_clock(),
memory_order_relaxed);
}
return status;
@ -560,13 +566,15 @@ static bool validate_header(struct peer *peer)
&& type != BGP_MSG_ROUTE_REFRESH_NEW
&& type != BGP_MSG_ROUTE_REFRESH_OLD
&& type != BGP_MSG_CAPABILITY) {
if (bgp_debug_neighbor_events(peer))
if (bgp_debug_neighbor_events(peer)) {
// XXX: zlog is not MT-safe
zlog_debug("%s unknown message type 0x%02x", peer->host,
type);
}
bgp_notify_send_with_data(peer, BGP_NOTIFY_HEADER_ERR,
BGP_NOTIFY_HEADER_BAD_MESTYPE,
(u_char *)&type, 1);
(u_char *) &type, 1);
return false;
}
@ -582,15 +590,17 @@ static bool validate_header(struct peer *peer)
&& size < BGP_MSG_ROUTE_REFRESH_MIN_SIZE)
|| (type == BGP_MSG_CAPABILITY
&& size < BGP_MSG_CAPABILITY_MIN_SIZE)) {
if (bgp_debug_neighbor_events(peer))
if (bgp_debug_neighbor_events(peer)) {
// XXX: zlog is not MT-safe
zlog_debug("%s bad message length - %d for %s",
peer->host, size,
type == 128 ? "ROUTE-REFRESH"
: bgp_type_str[(int)type]);
: bgp_type_str[(int) type]);
}
bgp_notify_send_with_data(peer, BGP_NOTIFY_HEADER_ERR,
BGP_NOTIFY_HEADER_BAD_MESLEN,
(u_char *)&size, 2);
(u_char *) &size, 2);
return false;
}

56
bgpd/bgpd.h
View File

@ -789,19 +789,19 @@ struct peer {
(CHECK_FLAG(peer->config, PEER_CONFIG_TIMER) \
|| CHECK_FLAG(peer->config, PEER_GROUP_CONFIG_TIMER))
u_int32_t holdtime;
u_int32_t keepalive;
u_int32_t connect;
u_int32_t routeadv;
_Atomic uint32_t holdtime;
_Atomic uint32_t keepalive;
_Atomic uint32_t connect;
_Atomic uint32_t routeadv;
/* Timer values. */
u_int32_t v_start;
u_int32_t v_connect;
u_int32_t v_holdtime;
u_int32_t v_keepalive;
u_int32_t v_routeadv;
u_int32_t v_pmax_restart;
u_int32_t v_gr_restart;
_Atomic uint32_t v_start;
_Atomic uint32_t v_connect;
_Atomic uint32_t v_holdtime;
_Atomic uint32_t v_keepalive;
_Atomic uint32_t v_routeadv;
_Atomic uint32_t v_pmax_restart;
_Atomic uint32_t v_gr_restart;
/* Threads. */
struct thread *t_read;
@ -818,7 +818,7 @@ struct peer {
struct thread *t_process_packet;
/* Thread flags. */
u_int16_t thread_flags;
_Atomic uint16_t thread_flags;
#define PEER_THREAD_WRITES_ON (1 << 0)
#define PEER_THREAD_READS_ON (1 << 1)
#define PEER_THREAD_KEEPALIVES_ON (1 << 2)
@ -826,19 +826,19 @@ struct peer {
struct work_queue *clear_node_queue;
/* Statistics field */
u_int32_t open_in; /* Open message input count */
u_int32_t open_out; /* Open message output count */
u_int32_t update_in; /* Update message input count */
u_int32_t update_out; /* Update message ouput count */
time_t update_time; /* Update message received time. */
u_int32_t keepalive_in; /* Keepalive input count */
u_int32_t keepalive_out; /* Keepalive output count */
u_int32_t notify_in; /* Notify input count */
u_int32_t notify_out; /* Notify output count */
u_int32_t refresh_in; /* Route Refresh input count */
u_int32_t refresh_out; /* Route Refresh output count */
u_int32_t dynamic_cap_in; /* Dynamic Capability input count. */
u_int32_t dynamic_cap_out; /* Dynamic Capability output count. */
_Atomic uint32_t open_in; /* Open message input count */
_Atomic uint32_t open_out; /* Open message output count */
_Atomic uint32_t update_in; /* Update message input count */
_Atomic uint32_t update_out; /* Update message ouput count */
_Atomic time_t update_time; /* Update message received time. */
_Atomic uint32_t keepalive_in; /* Keepalive input count */
_Atomic uint32_t keepalive_out; /* Keepalive output count */
_Atomic uint32_t notify_in; /* Notify input count */
_Atomic uint32_t notify_out; /* Notify output count */
_Atomic uint32_t refresh_in; /* Route Refresh input count */
_Atomic uint32_t refresh_out; /* Route Refresh output count */
_Atomic uint32_t dynamic_cap_in; /* Dynamic Capability input count. */
_Atomic uint32_t dynamic_cap_out; /* Dynamic Capability output count. */
/* BGP state count */
u_int32_t established; /* Established */
@ -851,8 +851,10 @@ struct peer {
/* Syncronization list and time. */
struct bgp_synchronize *sync[AFI_MAX][SAFI_MAX];
time_t synctime;
time_t last_write; /* timestamp when the last msg was written */
time_t last_update; /* timestamp when the last UPDATE msg was written */
/* timestamp when the last UPDATE msg was written */
_Atomic time_t last_write;
/* timestamp when the last msg was written */
_Atomic time_t last_update;
/* Send prefix count. */
unsigned long scount[AFI_MAX][SAFI_MAX];