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-rw-r--r--include/net/nexthop.h18
-rw-r--r--include/uapi/linux/nexthop.h9
-rw-r--r--net/ipv4/nexthop.c130
3 files changed, 149 insertions, 8 deletions
diff --git a/include/net/nexthop.h b/include/net/nexthop.h
index 1ba6d3668518..7ec9cc80f11c 100644
--- a/include/net/nexthop.h
+++ b/include/net/nexthop.h
@@ -122,6 +122,7 @@ struct nh_grp_entry {
struct list_head nh_list;
struct nexthop *nh_parent; /* nexthop of group with this entry */
+ u64 packets_hw;
};
struct nh_group {
@@ -166,6 +167,7 @@ enum nexthop_event_type {
NEXTHOP_EVENT_REPLACE,
NEXTHOP_EVENT_RES_TABLE_PRE_REPLACE,
NEXTHOP_EVENT_BUCKET_REPLACE,
+ NEXTHOP_EVENT_HW_STATS_REPORT_DELTA,
};
enum nh_notifier_info_type {
@@ -173,6 +175,7 @@ enum nh_notifier_info_type {
NH_NOTIFIER_INFO_TYPE_GRP,
NH_NOTIFIER_INFO_TYPE_RES_TABLE,
NH_NOTIFIER_INFO_TYPE_RES_BUCKET,
+ NH_NOTIFIER_INFO_TYPE_GRP_HW_STATS,
};
struct nh_notifier_single_info {
@@ -214,6 +217,17 @@ struct nh_notifier_res_table_info {
struct nh_notifier_single_info nhs[] __counted_by(num_nh_buckets);
};
+struct nh_notifier_grp_hw_stats_entry_info {
+ u32 id;
+ u64 packets;
+};
+
+struct nh_notifier_grp_hw_stats_info {
+ u16 num_nh;
+ bool hw_stats_used;
+ struct nh_notifier_grp_hw_stats_entry_info stats[] __counted_by(num_nh);
+};
+
struct nh_notifier_info {
struct net *net;
struct netlink_ext_ack *extack;
@@ -224,6 +238,7 @@ struct nh_notifier_info {
struct nh_notifier_grp_info *nh_grp;
struct nh_notifier_res_table_info *nh_res_table;
struct nh_notifier_res_bucket_info *nh_res_bucket;
+ struct nh_notifier_grp_hw_stats_info *nh_grp_hw_stats;
};
};
@@ -236,6 +251,9 @@ void nexthop_bucket_set_hw_flags(struct net *net, u32 id, u16 bucket_index,
bool offload, bool trap);
void nexthop_res_grp_activity_update(struct net *net, u32 id, u16 num_buckets,
unsigned long *activity);
+void nh_grp_hw_stats_report_delta(struct nh_notifier_grp_hw_stats_info *info,
+ unsigned int nh_idx,
+ u64 delta_packets);
/* caller is holding rcu or rtnl; no reference taken to nexthop */
struct nexthop *nexthop_find_by_id(struct net *net, u32 id);
diff --git a/include/uapi/linux/nexthop.h b/include/uapi/linux/nexthop.h
index b86af80d4e09..dd8787f9cf39 100644
--- a/include/uapi/linux/nexthop.h
+++ b/include/uapi/linux/nexthop.h
@@ -31,6 +31,7 @@ enum {
#define NEXTHOP_GRP_TYPE_MAX (__NEXTHOP_GRP_TYPE_MAX - 1)
#define NHA_OP_FLAG_DUMP_STATS BIT(0)
+#define NHA_OP_FLAG_DUMP_HW_STATS BIT(1)
enum {
NHA_UNSPEC,
@@ -71,6 +72,9 @@ enum {
/* u32; nexthop hardware stats enable */
NHA_HW_STATS_ENABLE,
+ /* u32; read-only; whether any driver collects HW stats */
+ NHA_HW_STATS_USED,
+
__NHA_MAX,
};
@@ -132,6 +136,11 @@ enum {
/* uint; number of packets forwarded via the nexthop group entry */
NHA_GROUP_STATS_ENTRY_PACKETS,
+ /* uint; number of packets forwarded via the nexthop group entry in
+ * hardware
+ */
+ NHA_GROUP_STATS_ENTRY_PACKETS_HW,
+
__NHA_GROUP_STATS_ENTRY_MAX,
};
diff --git a/net/ipv4/nexthop.c b/net/ipv4/nexthop.c
index e75b1aae5a81..e34466751d7b 100644
--- a/net/ipv4/nexthop.c
+++ b/net/ipv4/nexthop.c
@@ -26,7 +26,8 @@ static void remove_nexthop(struct net *net, struct nexthop *nh,
#define NH_DEV_HASHBITS 8
#define NH_DEV_HASHSIZE (1U << NH_DEV_HASHBITS)
-#define NHA_OP_FLAGS_DUMP_ALL (NHA_OP_FLAG_DUMP_STATS)
+#define NHA_OP_FLAGS_DUMP_ALL (NHA_OP_FLAG_DUMP_STATS | \
+ NHA_OP_FLAG_DUMP_HW_STATS)
static const struct nla_policy rtm_nh_policy_new[] = {
[NHA_ID] = { .type = NLA_U32 },
@@ -700,8 +701,95 @@ static void nh_grp_entry_stats_read(struct nh_grp_entry *nhge,
}
}
+static int nh_notifier_grp_hw_stats_init(struct nh_notifier_info *info,
+ const struct nexthop *nh)
+{
+ struct nh_group *nhg;
+ int i;
+
+ ASSERT_RTNL();
+ nhg = rtnl_dereference(nh->nh_grp);
+
+ info->id = nh->id;
+ info->type = NH_NOTIFIER_INFO_TYPE_GRP_HW_STATS;
+ info->nh_grp_hw_stats = kzalloc(struct_size(info->nh_grp_hw_stats,
+ stats, nhg->num_nh),
+ GFP_KERNEL);
+ if (!info->nh_grp_hw_stats)
+ return -ENOMEM;
+
+ info->nh_grp_hw_stats->num_nh = nhg->num_nh;
+ for (i = 0; i < nhg->num_nh; i++) {
+ struct nh_grp_entry *nhge = &nhg->nh_entries[i];
+
+ info->nh_grp_hw_stats->stats[i].id = nhge->nh->id;
+ }
+
+ return 0;
+}
+
+static void nh_notifier_grp_hw_stats_fini(struct nh_notifier_info *info)
+{
+ kfree(info->nh_grp_hw_stats);
+}
+
+void nh_grp_hw_stats_report_delta(struct nh_notifier_grp_hw_stats_info *info,
+ unsigned int nh_idx,
+ u64 delta_packets)
+{
+ info->hw_stats_used = true;
+ info->stats[nh_idx].packets += delta_packets;
+}
+EXPORT_SYMBOL(nh_grp_hw_stats_report_delta);
+
+static void nh_grp_hw_stats_apply_update(struct nexthop *nh,
+ struct nh_notifier_info *info)
+{
+ struct nh_group *nhg;
+ int i;
+
+ ASSERT_RTNL();
+ nhg = rtnl_dereference(nh->nh_grp);
+
+ for (i = 0; i < nhg->num_nh; i++) {
+ struct nh_grp_entry *nhge = &nhg->nh_entries[i];
+
+ nhge->packets_hw += info->nh_grp_hw_stats->stats[i].packets;
+ }
+}
+
+static int nh_grp_hw_stats_update(struct nexthop *nh, bool *hw_stats_used)
+{
+ struct nh_notifier_info info = {
+ .net = nh->net,
+ };
+ struct net *net = nh->net;
+ int err;
+
+ if (nexthop_notifiers_is_empty(net))
+ return 0;
+
+ err = nh_notifier_grp_hw_stats_init(&info, nh);
+ if (err)
+ return err;
+
+ err = blocking_notifier_call_chain(&net->nexthop.notifier_chain,
+ NEXTHOP_EVENT_HW_STATS_REPORT_DELTA,
+ &info);
+
+ /* Cache whatever we got, even if there was an error, otherwise the
+ * successful stats retrievals would get lost.
+ */
+ nh_grp_hw_stats_apply_update(nh, &info);
+ *hw_stats_used = info.nh_grp_hw_stats->hw_stats_used;
+
+ nh_notifier_grp_hw_stats_fini(&info);
+ return notifier_to_errno(err);
+}
+
static int nla_put_nh_group_stats_entry(struct sk_buff *skb,
- struct nh_grp_entry *nhge)
+ struct nh_grp_entry *nhge,
+ u32 op_flags)
{
struct nlattr *nest;
u64 packets;
@@ -713,7 +801,13 @@ static int nla_put_nh_group_stats_entry(struct sk_buff *skb,
return -EMSGSIZE;
if (nla_put_u32(skb, NHA_GROUP_STATS_ENTRY_ID, nhge->nh->id) ||
- nla_put_uint(skb, NHA_GROUP_STATS_ENTRY_PACKETS, packets))
+ nla_put_uint(skb, NHA_GROUP_STATS_ENTRY_PACKETS,
+ packets + nhge->packets_hw))
+ goto nla_put_failure;
+
+ if (op_flags & NHA_OP_FLAG_DUMP_HW_STATS &&
+ nla_put_uint(skb, NHA_GROUP_STATS_ENTRY_PACKETS_HW,
+ nhge->packets_hw))
goto nla_put_failure;
nla_nest_end(skb, nest);
@@ -724,18 +818,35 @@ nla_put_failure:
return -EMSGSIZE;
}
-static int nla_put_nh_group_stats(struct sk_buff *skb, struct nexthop *nh)
+static int nla_put_nh_group_stats(struct sk_buff *skb, struct nexthop *nh,
+ u32 op_flags)
{
struct nh_group *nhg = rtnl_dereference(nh->nh_grp);
struct nlattr *nest;
+ bool hw_stats_used;
+ int err;
int i;
+ if (nla_put_u32(skb, NHA_HW_STATS_ENABLE, nhg->hw_stats))
+ goto err_out;
+
+ if (op_flags & NHA_OP_FLAG_DUMP_HW_STATS &&
+ nhg->hw_stats) {
+ err = nh_grp_hw_stats_update(nh, &hw_stats_used);
+ if (err)
+ goto out;
+
+ if (nla_put_u32(skb, NHA_HW_STATS_USED, hw_stats_used))
+ goto err_out;
+ }
+
nest = nla_nest_start(skb, NHA_GROUP_STATS);
if (!nest)
- return -EMSGSIZE;
+ goto err_out;
for (i = 0; i < nhg->num_nh; i++)
- if (nla_put_nh_group_stats_entry(skb, &nhg->nh_entries[i]))
+ if (nla_put_nh_group_stats_entry(skb, &nhg->nh_entries[i],
+ op_flags))
goto cancel_out;
nla_nest_end(skb, nest);
@@ -743,7 +854,10 @@ static int nla_put_nh_group_stats(struct sk_buff *skb, struct nexthop *nh)
cancel_out:
nla_nest_cancel(skb, nest);
- return -EMSGSIZE;
+err_out:
+ err = -EMSGSIZE;
+out:
+ return err;
}
static int nla_put_nh_group(struct sk_buff *skb, struct nexthop *nh,
@@ -780,7 +894,7 @@ static int nla_put_nh_group(struct sk_buff *skb, struct nexthop *nh,
if (op_flags & NHA_OP_FLAG_DUMP_STATS &&
(nla_put_u32(skb, NHA_HW_STATS_ENABLE, nhg->hw_stats) ||
- nla_put_nh_group_stats(skb, nh)))
+ nla_put_nh_group_stats(skb, nh, op_flags)))
goto nla_put_failure;
return 0;
generated by cgit (git 2.34.1) at 2024-05-28 06:13:49 +0000