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platform: track refresh-all actions that are in progress

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We aim to keep the platform cache up-to-date only via the netlink
events. However, due to kernel shortcomings we often have to resync
by re-requesting the data, which especially for routes and addresses
means a full dump (as you cannot request only specific route/address
information).

Thus it makes sense to avoid expensive dumps whenever we can.

We schedule dumps via "delayed-actions" and that is already smart
so that muliple schedulings are combined. However, before requesting
a new dump, we clear the flag that indicates that a dump is scheduled.
Thus, while processing the result of of a dump, we would re-schedule
anew which can be necessary in some cases.

In certain cases, we don't require a full resync, when we are in the
middle of processing a dump, because that one dump will provide us
with the full picture. Thus, we can avoid scheduling a new dump if
  - we already scheduled a delayed action
  - we are in the middle or processing a dump.
This can now be checked via delayed_action_refresh_all_in_progress().
This commit is contained in:
Thomas Haller
2016-04-07 19:02:19 +02:00
parent 8bf635af0e
commit ff8c82e7e1
1 changed files with 117 additions and 14 deletions
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131
src/platform/nm-linux-platform.c
View File

@@ -176,13 +176,22 @@
* Forward declarations and enums
******************************************************************/
enum {
DELAYED_ACTION_IDX_REFRESH_ALL_LINKS,
DELAYED_ACTION_IDX_REFRESH_ALL_IP4_ADDRESSES,
DELAYED_ACTION_IDX_REFRESH_ALL_IP6_ADDRESSES,
DELAYED_ACTION_IDX_REFRESH_ALL_IP4_ROUTES,
DELAYED_ACTION_IDX_REFRESH_ALL_IP6_ROUTES,
_DELAYED_ACTION_IDX_REFRESH_ALL_NUM,
};
typedef enum {
DELAYED_ACTION_TYPE_NONE = 0,
DELAYED_ACTION_TYPE_REFRESH_ALL_LINKS = (1LL << 0),
DELAYED_ACTION_TYPE_REFRESH_ALL_IP4_ADDRESSES = (1LL << 1),
DELAYED_ACTION_TYPE_REFRESH_ALL_IP6_ADDRESSES = (1LL << 2),
DELAYED_ACTION_TYPE_REFRESH_ALL_IP4_ROUTES = (1LL << 3),
DELAYED_ACTION_TYPE_REFRESH_ALL_IP6_ROUTES = (1LL << 4),
DELAYED_ACTION_TYPE_REFRESH_ALL_LINKS = (1LL << DELAYED_ACTION_IDX_REFRESH_ALL_LINKS),
DELAYED_ACTION_TYPE_REFRESH_ALL_IP4_ADDRESSES = (1LL << DELAYED_ACTION_IDX_REFRESH_ALL_IP4_ADDRESSES),
DELAYED_ACTION_TYPE_REFRESH_ALL_IP6_ADDRESSES = (1LL << DELAYED_ACTION_IDX_REFRESH_ALL_IP6_ADDRESSES),
DELAYED_ACTION_TYPE_REFRESH_ALL_IP4_ROUTES = (1LL << DELAYED_ACTION_IDX_REFRESH_ALL_IP4_ROUTES),
DELAYED_ACTION_TYPE_REFRESH_ALL_IP6_ROUTES = (1LL << DELAYED_ACTION_IDX_REFRESH_ALL_IP6_ROUTES),
DELAYED_ACTION_TYPE_REFRESH_LINK = (1LL << 5),
DELAYED_ACTION_TYPE_MASTER_CONNECTED = (1LL << 6),
DELAYED_ACTION_TYPE_READ_NETLINK = (1LL << 7),
@@ -2342,6 +2351,7 @@ typedef struct {
WaitForNlResponseResult seq_result;
gint64 timeout_abs_ns;
WaitForNlResponseResult *out_seq_result;
gint *out_refresh_all_in_progess;
} DelayedActionWaitForNlResponseData;
typedef struct _NMLinuxPlatformPrivate NMLinuxPlatformPrivate;
@@ -2352,6 +2362,7 @@ struct _NMLinuxPlatformPrivate {
#ifdef NM_MORE_LOGGING
guint32 nlh_seq_last_handled;
#endif
guint32 nlh_seq_last_seen;
NMPCache *cache;
GIOChannel *event_channel;
guint event_id;
@@ -2362,10 +2373,18 @@ struct _NMLinuxPlatformPrivate {
GUdevClient *udev_client;
struct {
/* which delayed actions are scheduled, as marked in @flags.
* Some types have additional arguments in the fields below. */
DelayedActionType flags;
/* counter that a refresh all action is in progress, separated
* by type. */
gint refresh_all_in_progess[_DELAYED_ACTION_IDX_REFRESH_ALL_NUM];
GPtrArray *list_master_connected;
GPtrArray *list_refresh_link;
GArray *list_wait_for_nl_response;
gint is_handling;
} delayed_action;
@@ -2740,6 +2759,16 @@ delayed_action_refresh_to_object_type (DelayedActionType action_type)
}
}
_NM_UTILS_LOOKUP_DEFINE (static, delayed_action_refresh_all_to_idx, DelayedActionType, guint,
NM_UTILS_LOOKUP_DEFAULT_NM_ASSERT (0),
NM_UTILS_LOOKUP_ITEM (DELAYED_ACTION_TYPE_REFRESH_ALL_LINKS, DELAYED_ACTION_IDX_REFRESH_ALL_LINKS),
NM_UTILS_LOOKUP_ITEM (DELAYED_ACTION_TYPE_REFRESH_ALL_IP4_ADDRESSES, DELAYED_ACTION_IDX_REFRESH_ALL_IP4_ADDRESSES),
NM_UTILS_LOOKUP_ITEM (DELAYED_ACTION_TYPE_REFRESH_ALL_IP6_ADDRESSES, DELAYED_ACTION_IDX_REFRESH_ALL_IP6_ADDRESSES),
NM_UTILS_LOOKUP_ITEM (DELAYED_ACTION_TYPE_REFRESH_ALL_IP4_ROUTES, DELAYED_ACTION_IDX_REFRESH_ALL_IP4_ROUTES),
NM_UTILS_LOOKUP_ITEM (DELAYED_ACTION_TYPE_REFRESH_ALL_IP6_ROUTES, DELAYED_ACTION_IDX_REFRESH_ALL_IP6_ROUTES),
NM_UTILS_LOOKUP_ITEM_IGNORE_OTHER (),
);
static const char *
delayed_action_to_string (DelayedActionType action_type)
{
@@ -2807,6 +2836,24 @@ delayed_action_to_string_full (DelayedActionType action_type, gpointer user_data
/*****************************************************************************/
static gboolean
delayed_action_refresh_all_in_progress (NMPlatform *platform, DelayedActionType action_type)
{
NMLinuxPlatformPrivate *priv = NM_LINUX_PLATFORM_GET_PRIVATE (platform);
nm_assert (nm_utils_is_power_of_two (action_type));
nm_assert (NM_FLAGS_ANY (action_type, DELAYED_ACTION_TYPE_REFRESH_ALL));
nm_assert (!NM_FLAGS_ANY (action_type, ~DELAYED_ACTION_TYPE_REFRESH_ALL));
if (NM_FLAGS_ANY (priv->delayed_action.flags, action_type))
return TRUE;
if (priv->delayed_action.refresh_all_in_progess[delayed_action_refresh_all_to_idx (action_type)] > 0)
return TRUE;
return FALSE;
}
static void
delayed_action_wait_for_nl_response_complete (NMPlatform *platform,
guint idx,
@@ -2827,6 +2874,10 @@ delayed_action_wait_for_nl_response_complete (NMPlatform *platform,
priv->delayed_action.flags &= ~DELAYED_ACTION_TYPE_WAIT_FOR_NL_RESPONSE;
if (data->out_seq_result)
*data->out_seq_result = seq_result;
if (data->out_refresh_all_in_progess) {
nm_assert (*data->out_refresh_all_in_progess > 0);
*data->out_refresh_all_in_progess -= 1;
}
g_array_remove_index_fast (priv->delayed_action.list_wait_for_nl_response, idx);
}
@@ -3032,12 +3083,14 @@ delayed_action_schedule (NMPlatform *platform, DelayedActionType action_type, gp
static void
delayed_action_schedule_WAIT_FOR_NL_RESPONSE (NMPlatform *platform,
guint32 seq_number,
WaitForNlResponseResult *out_seq_result)
WaitForNlResponseResult *out_seq_result,
gint *out_refresh_all_in_progess)
{
DelayedActionWaitForNlResponseData data = {
.seq_number = seq_number,
.timeout_abs_ns = nm_utils_get_monotonic_timestamp_ns () + (200 * (NM_UTILS_NS_PER_SECOND / 1000)),
.out_seq_result = out_seq_result,
.out_refresh_all_in_progess = out_refresh_all_in_progess,
};
delayed_action_schedule (platform,
@@ -3352,7 +3405,8 @@ cache_pre_hook (NMPCache *cache, const NMPObject *old, const NMPObject *new, NMP
static int
_nl_send_auto_with_seq (NMPlatform *platform,
struct nl_msg *nlmsg,
WaitForNlResponseResult *out_seq_result)
WaitForNlResponseResult *out_seq_result,
gint *out_refresh_all_in_progess)
{
NMLinuxPlatformPrivate *priv = NM_LINUX_PLATFORM_GET_PRIVATE (platform);
guint32 seq;
@@ -3367,7 +3421,7 @@ _nl_send_auto_with_seq (NMPlatform *platform,
if (nle >= 0) {
nle = 0;
delayed_action_schedule_WAIT_FOR_NL_RESPONSE (platform, seq, out_seq_result);
delayed_action_schedule_WAIT_FOR_NL_RESPONSE (platform, seq, out_seq_result, out_refresh_all_in_progess);
} else
_LOGD ("netlink: send: failed sending message: %s (%d)", nl_geterror (nle), nle);
@@ -3401,7 +3455,7 @@ do_request_link_no_delayed_actions (NMPlatform *platform, int ifindex, const cha
0,
0);
if (nlmsg)
_nl_send_auto_with_seq (platform, nlmsg, NULL);
_nl_send_auto_with_seq (platform, nlmsg, NULL, NULL);
}
static void
@@ -3432,6 +3486,11 @@ do_request_all_no_delayed_actions (NMPlatform *platform, DelayedActionType actio
.rtgen_family = klass->addr_family,
};
int nle;
gint *out_refresh_all_in_progess;
out_refresh_all_in_progess = &priv->delayed_action.refresh_all_in_progess[delayed_action_refresh_all_to_idx (iflags)];
nm_assert (*out_refresh_all_in_progess >= 0);
*out_refresh_all_in_progess += 1;
/* clear any delayed action that request a refresh of this object type. */
priv->delayed_action.flags &= ~iflags;
@@ -3456,7 +3515,10 @@ do_request_all_no_delayed_actions (NMPlatform *platform, DelayedActionType actio
if (nle < 0)
continue;
_nl_send_auto_with_seq (platform, nlmsg, NULL);
if (_nl_send_auto_with_seq (platform, nlmsg, NULL, out_refresh_all_in_progess) < 0) {
nm_assert (*out_refresh_all_in_progess > 0);
*out_refresh_all_in_progess -= 1;
}
}
}
@@ -3467,6 +3529,38 @@ do_request_one_type (NMPlatform *platform, NMPObjectType obj_type)
delayed_action_handle_all (platform, FALSE);
}
static void
event_seq_check_refresh_all (NMPlatform *platform, guint32 seq_number)
{
NMLinuxPlatformPrivate *priv = NM_LINUX_PLATFORM_GET_PRIVATE (platform);
DelayedActionWaitForNlResponseData *data;
guint i;
(void) delayed_action_refresh_all_in_progress;
if (NM_IN_SET (seq_number, 0, priv->nlh_seq_last_seen))
return;
if (NM_FLAGS_HAS (priv->delayed_action.flags, DELAYED_ACTION_TYPE_WAIT_FOR_NL_RESPONSE)) {
nm_assert (priv->delayed_action.list_wait_for_nl_response->len > 0);
for (i = 0; i < priv->delayed_action.list_wait_for_nl_response->len; i++) {
data = &g_array_index (priv->delayed_action.list_wait_for_nl_response, DelayedActionWaitForNlResponseData, i);
if (data->seq_number == priv->nlh_seq_last_seen) {
if (data->out_refresh_all_in_progess) {
nm_assert (*data->out_refresh_all_in_progess > 0);
*data->out_refresh_all_in_progess -= 1;
data->out_refresh_all_in_progess = NULL;
break;
}
}
}
}
priv->nlh_seq_last_seen = seq_number;
}
static void
event_seq_check (NMPlatform *platform, guint32 seq_number, WaitForNlResponseResult seq_result)
{
@@ -3698,7 +3792,7 @@ do_add_link_with_lookup (NMPlatform *platform,
}
}
nle = _nl_send_auto_with_seq (platform, nlmsg, &seq_result);
nle = _nl_send_auto_with_seq (platform, nlmsg, &seq_result, NULL);
if (nle < 0) {
_LOGE ("do-add-link[%s/%s]: failed sending netlink request \"%s\" (%d)",
name,
@@ -3749,7 +3843,7 @@ do_add_addrroute (NMPlatform *platform, const NMPObject *obj_id, struct nl_msg *
event_handler_read_netlink (platform, FALSE);
nle = _nl_send_auto_with_seq (platform, nlmsg, &seq_result);
nle = _nl_send_auto_with_seq (platform, nlmsg, &seq_result, NULL);
if (nle < 0) {
_LOGE ("do-add-%s[%s]: failure sending netlink request \"%s\" (%d)",
NMP_OBJECT_GET_CLASS (obj_id)->obj_type_name,
@@ -3802,7 +3896,7 @@ do_delete_object (NMPlatform *platform, const NMPObject *obj_id, struct nl_msg *
event_handler_read_netlink (platform, FALSE);
nle = _nl_send_auto_with_seq (platform, nlmsg, &seq_result);
nle = _nl_send_auto_with_seq (platform, nlmsg, &seq_result, NULL);
if (nle < 0) {
_LOGE ("do-delete-%s[%s]: failure sending netlink request \"%s\" (%d)",
NMP_OBJECT_GET_CLASS (obj_id)->obj_type_name,
@@ -3863,7 +3957,7 @@ do_change_link (NMPlatform *platform,
return NM_PLATFORM_ERROR_UNSPECIFIED;
retry:
nle = _nl_send_auto_with_seq (platform, nlmsg, &seq_result);
nle = _nl_send_auto_with_seq (platform, nlmsg, &seq_result, NULL);
if (nle < 0) {
_LOGE ("do-change-link[%d]: failure sending netlink request \"%s\" (%d)",
ifindex,
@@ -5743,6 +5837,15 @@ continue_reading:
seq_number = nlmsg_hdr (msg)->nlmsg_seq;
/* check whether the seq number is different from before, and
* whether the previous number (@nlh_seq_last_seen) is a pending
* refresh-all request. In that case, the pending request is thereby
* completed.
*
* We must do that before processing the message with event_valid_msg(),
* because we must track the completion of the pending request before that. */
event_seq_check_refresh_all (platform, seq_number);
if (process_valid_msg) {
/* Valid message (not checking for MULTIPART bit to
* get along with broken kernels. NL_SKIP has no