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Date: Tue, 27 Feb 2024 19:17:28 +0100
From: Petr Machata <petrm@...dia.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
<pabeni@...hat.com>, <netdev@...r.kernel.org>
CC: Ido Schimmel <idosch@...dia.com>, Petr Machata <petrm@...dia.com>, "David
Ahern" <dsahern@...nel.org>, <mlxsw@...dia.com>
Subject: [PATCH net-next 3/7] net: nexthop: Add nexthop group entry stats
From: Ido Schimmel <idosch@...dia.com>
Add nexthop group entry stats to count the number of packets forwarded
via each nexthop in the group. The stats will be exposed to user space
for better data path observability in the next patch.
The per-CPU stats pointer is placed at the beginning of 'struct
nh_grp_entry', so that all the fields accessed for the data path reside
on the same cache line:
struct nh_grp_entry {
struct nexthop * nh; /* 0 8 */
struct nh_grp_entry_stats * stats; /* 8 8 */
u8 weight; /* 16 1 */
/* XXX 7 bytes hole, try to pack */
union {
struct {
atomic_t upper_bound; /* 24 4 */
} hthr; /* 24 4 */
struct {
struct list_head uw_nh_entry; /* 24 16 */
u16 count_buckets; /* 40 2 */
u16 wants_buckets; /* 42 2 */
} res; /* 24 24 */
}; /* 24 24 */
struct list_head nh_list; /* 48 16 */
/* --- cacheline 1 boundary (64 bytes) --- */
struct nexthop * nh_parent; /* 64 8 */
/* size: 72, cachelines: 2, members: 6 */
/* sum members: 65, holes: 1, sum holes: 7 */
/* last cacheline: 8 bytes */
};
Signed-off-by: Ido Schimmel <idosch@...dia.com>
Signed-off-by: Petr Machata <petrm@...dia.com>
---
include/net/nexthop.h | 6 ++++++
net/ipv4/nexthop.c | 24 ++++++++++++++++++++----
2 files changed, 26 insertions(+), 4 deletions(-)
diff --git a/include/net/nexthop.h b/include/net/nexthop.h
index 77e99cba60ad..4bf1875445d8 100644
--- a/include/net/nexthop.h
+++ b/include/net/nexthop.h
@@ -95,8 +95,14 @@ struct nh_res_table {
struct nh_res_bucket nh_buckets[] __counted_by(num_nh_buckets);
};
+struct nh_grp_entry_stats {
+ u64 packets;
+ struct u64_stats_sync syncp;
+};
+
struct nh_grp_entry {
struct nexthop *nh;
+ struct nh_grp_entry_stats __percpu *stats;
u8 weight;
union {
diff --git a/net/ipv4/nexthop.c b/net/ipv4/nexthop.c
index e41e4ac69aee..29d0ed049b91 100644
--- a/net/ipv4/nexthop.c
+++ b/net/ipv4/nexthop.c
@@ -480,6 +480,7 @@ static void nexthop_free_group(struct nexthop *nh)
struct nh_grp_entry *nhge = &nhg->nh_entries[i];
WARN_ON(!list_empty(&nhge->nh_list));
+ free_percpu(nhge->stats);
nexthop_put(nhge->nh);
}
@@ -1182,6 +1183,7 @@ static struct nexthop *nexthop_select_path_fdb(struct nh_group *nhg, int hash)
if (hash > atomic_read(&nhge->hthr.upper_bound))
continue;
+ this_cpu_inc(nhge->stats->packets);
return nhge->nh;
}
@@ -1191,7 +1193,7 @@ static struct nexthop *nexthop_select_path_fdb(struct nh_group *nhg, int hash)
static struct nexthop *nexthop_select_path_hthr(struct nh_group *nhg, int hash)
{
- struct nexthop *rc = NULL;
+ struct nh_grp_entry *nhge0 = NULL;
int i;
if (nhg->fdb_nh)
@@ -1206,16 +1208,20 @@ static struct nexthop *nexthop_select_path_hthr(struct nh_group *nhg, int hash)
if (!nexthop_is_good_nh(nhge->nh))
continue;
- if (!rc)
- rc = nhge->nh;
+ if (!nhge0)
+ nhge0 = nhge;
if (hash > atomic_read(&nhge->hthr.upper_bound))
continue;
+ this_cpu_inc(nhge->stats->packets);
return nhge->nh;
}
- return rc ? : nhg->nh_entries[0].nh;
+ if (!nhge0)
+ nhge0 = &nhg->nh_entries[0];
+ this_cpu_inc(nhge0->stats->packets);
+ return nhge0->nh;
}
static struct nexthop *nexthop_select_path_res(struct nh_group *nhg, int hash)
@@ -1231,6 +1237,7 @@ static struct nexthop *nexthop_select_path_res(struct nh_group *nhg, int hash)
bucket = &res_table->nh_buckets[bucket_index];
nh_res_bucket_set_busy(bucket);
nhge = rcu_dereference(bucket->nh_entry);
+ this_cpu_inc(nhge->stats->packets);
return nhge->nh;
}
@@ -1804,6 +1811,7 @@ static void remove_nh_grp_entry(struct net *net, struct nh_grp_entry *nhge,
newg->has_v4 = true;
list_del(&nhges[i].nh_list);
+ new_nhges[j].stats = nhges[i].stats;
new_nhges[j].nh_parent = nhges[i].nh_parent;
new_nhges[j].nh = nhges[i].nh;
new_nhges[j].weight = nhges[i].weight;
@@ -1819,6 +1827,7 @@ static void remove_nh_grp_entry(struct net *net, struct nh_grp_entry *nhge,
rcu_assign_pointer(nhp->nh_grp, newg);
list_del(&nhge->nh_list);
+ free_percpu(nhge->stats);
nexthop_put(nhge->nh);
/* Removal of a NH from a resilient group is notified through
@@ -2483,6 +2492,12 @@ static struct nexthop *nexthop_create_group(struct net *net,
if (nhi->family == AF_INET)
nhg->has_v4 = true;
+ nhg->nh_entries[i].stats =
+ netdev_alloc_pcpu_stats(struct nh_grp_entry_stats);
+ if (!nhg->nh_entries[i].stats) {
+ nexthop_put(nhe);
+ goto out_no_nh;
+ }
nhg->nh_entries[i].nh = nhe;
nhg->nh_entries[i].weight = entry[i].weight + 1;
list_add(&nhg->nh_entries[i].nh_list, &nhe->grp_list);
@@ -2522,6 +2537,7 @@ static struct nexthop *nexthop_create_group(struct net *net,
out_no_nh:
for (i--; i >= 0; --i) {
list_del(&nhg->nh_entries[i].nh_list);
+ free_percpu(nhg->nh_entries[i].stats);
nexthop_put(nhg->nh_entries[i].nh);
}
--
2.43.0
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