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Message-Id: <20200311124524.4777-1-jiri@resnulli.us>
Date: Wed, 11 Mar 2020 13:45:24 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: netdev@...r.kernel.org
Cc: dsahern@...il.com, stephen@...workplumber.org, mlxsw@...lanox.com
Subject: [patch iproute2/net-next v3] tc: m_action: introduce support for hw stats type
From: Jiri Pirko <jiri@...lanox.com>
Introduce support for per-action hw stats type config.
This patch allows user to specify one of the following types of HW
stats for added action:
immediate - queried during dump time
delayed - polled from HW periodically or sent by HW in async manner
disabled - no stats needed
Note that if "hw_stats" option is not passed, user does not care about
the type, just expects any type of stats.
Examples:
$ tc filter add dev enp0s16np28 ingress proto ip handle 1 pref 1 flower skip_sw dst_ip 192.168.1.1 action drop hw_stats disabled
$ tc -s filter show dev enp0s16np28 ingress
filter protocol ip pref 1 flower chain 0
filter protocol ip pref 1 flower chain 0 handle 0x1
eth_type ipv4
dst_ip 192.168.1.1
skip_sw
in_hw in_hw_count 2
action order 1: gact action drop
random type none pass val 0
index 1 ref 1 bind 1 installed 7 sec used 2 sec
Action statistics:
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
hw_stats disabled
$ tc filter add dev enp0s16np28 ingress proto ip handle 1 pref 1 flower skip_sw dst_ip 192.168.1.1 action drop hw_stats immediate
$ tc -s filter show dev enp0s16np28 ingress
filter protocol ip pref 1 flower chain 0
filter protocol ip pref 1 flower chain 0 handle 0x1
eth_type ipv4
dst_ip 192.168.1.1
skip_sw
in_hw in_hw_count 2
action order 1: gact action drop
random type none pass val 0
index 1 ref 1 bind 1 installed 11 sec used 4 sec
Action statistics:
Sent 102 bytes 1 pkt (dropped 1, overlimits 0 requeues 0)
Sent software 0 bytes 0 pkt
Sent hardware 102 bytes 1 pkt
backlog 0b 0p requeues 0
hw_stats immediate
Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
v2->v3:
- adjusted hw_stats_type_bf struct initialization
- added comment to "disable"
v1->v2:
- added more description and examples
---
include/uapi/linux/pkt_cls.h | 22 +++++++++++++
man/man8/tc-actions.8 | 31 ++++++++++++++++++
tc/m_action.c | 63 ++++++++++++++++++++++++++++++++++++
3 files changed, 116 insertions(+)
diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index 449a63971451..81cc1a869588 100644
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -17,6 +17,7 @@ enum {
TCA_ACT_PAD,
TCA_ACT_COOKIE,
TCA_ACT_FLAGS,
+ TCA_ACT_HW_STATS_TYPE,
__TCA_ACT_MAX
};
@@ -24,6 +25,27 @@ enum {
* actions stats.
*/
+/* tca HW stats type
+ * When user does not pass the attribute, he does not care.
+ * It is the same as if he would pass the attribute with
+ * all supported bits set.
+ * In case no bits are set, user is not interested in getting any HW statistics.
+ */
+#define TCA_ACT_HW_STATS_TYPE_IMMEDIATE (1 << 0) /* Means that in dump, user
+ * gets the current HW stats
+ * state from the device
+ * queried at the dump time.
+ */
+#define TCA_ACT_HW_STATS_TYPE_DELAYED (1 << 1) /* Means that in dump, user gets
+ * HW stats that might be out
+ * of date for some time, maybe
+ * couple of seconds. This is
+ * the case when driver polls
+ * stats updates periodically
+ * or when it gets async stats update
+ * from the device.
+ */
+
#define TCA_ACT_MAX __TCA_ACT_MAX
#define TCA_OLD_COMPAT (TCA_ACT_MAX+1)
#define TCA_ACT_MAX_PRIO 32
diff --git a/man/man8/tc-actions.8 b/man/man8/tc-actions.8
index bee59f7247fa..7d7df00013c6 100644
--- a/man/man8/tc-actions.8
+++ b/man/man8/tc-actions.8
@@ -49,6 +49,8 @@ actions \- independently defined actions in tc
] [
.I FLAGS
] [
+.I HWSTATSSPEC
+] [
.I CONTROL
]
@@ -77,6 +79,12 @@ ACTNAME
:=
.I no_percpu
+.I HWSTATSSPEC
+:=
+.BR hw_stats " {"
+.IR immediate " | " delayed " | " disabled
+.R }
+
.I ACTDETAIL
:=
.I ACTNAME ACTPARAMS
@@ -200,6 +208,29 @@ which indicates that action is expected to have minimal software data-path
traffic and doesn't need to allocate stat counters with percpu allocator.
This option is intended to be used by hardware-offloaded actions.
+.TP
+.BI hw_stats " HW_STATS"
+Speficies the type of HW stats of new action. If omitted, any stats counter type
+is going to be used, according to driver and its resources.
+The
+.I HW_STATS
+indicates the type. Any of the following are valid:
+.RS
+.TP
+.B immediate
+Means that in dump, user gets the current HW stats state from the device
+queried at the dump time.
+.TP
+.B delayed
+Means that in dump, user gets HW stats that might be out of date for
+some time, maybe couple of seconds. This is the case when driver polls
+stats updates periodically or when it gets async stats update
+from the device.
+.TP
+.B disabled
+No HW stats are going to be available in dump.
+.RE
+
.TP
.BI since " MSTIME"
When dumping large number of actions, a millisecond time-filter can be
diff --git a/tc/m_action.c b/tc/m_action.c
index 4da810c8c0aa..849a3de4aa4d 100644
--- a/tc/m_action.c
+++ b/tc/m_action.c
@@ -149,6 +149,59 @@ new_cmd(char **argv)
(matches(*argv, "add") == 0);
}
+static const struct hw_stats_type_item {
+ const char *str;
+ __u8 type;
+} hw_stats_type_items[] = {
+ { "immediate", TCA_ACT_HW_STATS_TYPE_IMMEDIATE },
+ { "delayed", TCA_ACT_HW_STATS_TYPE_DELAYED },
+ { "disabled", 0 }, /* no bit set */
+};
+
+static void print_hw_stats(const struct rtattr *arg)
+{
+ struct nla_bitfield32 *hw_stats_type_bf = RTA_DATA(arg);
+ __u8 hw_stats_type;
+ int i;
+
+ hw_stats_type = hw_stats_type_bf->value & hw_stats_type_bf->selector;
+ print_string(PRINT_FP, NULL, "\t", NULL);
+ open_json_array(PRINT_ANY, "hw_stats");
+
+ for (i = 0; i < ARRAY_SIZE(hw_stats_type_items); i++) {
+ const struct hw_stats_type_item *item;
+
+ item = &hw_stats_type_items[i];
+ if ((!hw_stats_type && !item->type) ||
+ hw_stats_type & item->type)
+ print_string(PRINT_ANY, NULL, " %s", item->str);
+ }
+ close_json_array(PRINT_JSON, NULL);
+}
+
+static int parse_hw_stats(const char *str, struct nlmsghdr *n)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(hw_stats_type_items); i++) {
+ const struct hw_stats_type_item *item;
+
+ item = &hw_stats_type_items[i];
+ if (matches(str, item->str) == 0) {
+ struct nla_bitfield32 hw_stats_type_bf = {
+ .value = item->type,
+ .selector = item->type
+ };
+
+ addattr_l(n, MAX_MSG, TCA_ACT_HW_STATS_TYPE,
+ &hw_stats_type_bf, sizeof(hw_stats_type_bf));
+ return 0;
+ }
+
+ }
+ return -1;
+}
+
int parse_action(int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
{
int argc = *argc_p;
@@ -250,6 +303,14 @@ done0:
addattr_l(n, MAX_MSG, TCA_ACT_COOKIE,
&act_ck, act_ck_len);
+ if (*argv && matches(*argv, "hw_stats") == 0) {
+ NEXT_ARG();
+ ret = parse_hw_stats(*argv, n);
+ if (ret < 0)
+ invarg("value is invalid\n", *argv);
+ NEXT_ARG_FWD();
+ }
+
if (*argv && strcmp(*argv, "no_percpu") == 0) {
struct nla_bitfield32 flags =
{ TCA_ACT_FLAGS_NO_PERCPU_STATS,
@@ -337,6 +398,8 @@ static int tc_print_one_action(FILE *f, struct rtattr *arg)
TCA_ACT_FLAGS_NO_PERCPU_STATS);
print_string(PRINT_FP, NULL, "%s", _SL_);
}
+ if (tb[TCA_ACT_HW_STATS_TYPE])
+ print_hw_stats(tb[TCA_ACT_HW_STATS_TYPE]);
return 0;
}
--
2.21.1
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