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Message-Id: <20220224133335.599529-8-idosch@nvidia.com>
Date: Thu, 24 Feb 2022 15:33:28 +0200
From: Ido Schimmel <idosch@...dia.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org, petrm@...dia.com,
jiri@...dia.com, razor@...ckwall.org, roopa@...dia.com,
dsahern@...il.com, andrew@...n.ch, mlxsw@...dia.com,
Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 07/14] net: rtnetlink: Add UAPI for obtaining L3 offload xstats
From: Petr Machata <petrm@...dia.com>
Add a new IFLA_STATS_LINK_OFFLOAD_XSTATS child attribute,
IFLA_OFFLOAD_XSTATS_L3_STATS, to carry statistics for traffic that takes
place in a HW router.
The offloaded HW stats are designed to allow per-netdevice enablement and
disablement. Additionally, as a netdevice is configured, it may become or
cease being suitable for binding of a HW counter. Both of these aspects
need to be communicated to the userspace. To that end, add another child
attribute, IFLA_OFFLOAD_XSTATS_HW_S_INFO:
- attr nest IFLA_OFFLOAD_XSTATS_HW_S_INFO
- attr nest IFLA_OFFLOAD_XSTATS_L3_STATS
- attr IFLA_OFFLOAD_XSTATS_HW_S_INFO_REQUEST
- {0,1} as u8
- attr IFLA_OFFLOAD_XSTATS_HW_S_INFO_USED
- {0,1} as u8
Thus this one attribute is a nest that can be used to carry information
about various types of HW statistics, and indexing is very simply done by
wrapping the information for a given statistics suite into the attribute
that carries the suite is the RTM_GETSTATS query. At the same time, because
_HW_S_INFO is nested directly below IFLA_STATS_LINK_OFFLOAD_XSTATS, it is
possible through filtering to request only the metadata about individual
statistics suites, without having to hit the HW to get the actual counters.
Signed-off-by: Petr Machata <petrm@...dia.com>
Signed-off-by: Ido Schimmel <idosch@...dia.com>
---
include/uapi/linux/if_link.h | 11 +++
net/core/rtnetlink.c | 170 +++++++++++++++++++++++++++++++++++
2 files changed, 181 insertions(+)
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index f5d88a7b1c36..704e32bbf160 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -1186,10 +1186,21 @@ enum {
enum {
IFLA_OFFLOAD_XSTATS_UNSPEC,
IFLA_OFFLOAD_XSTATS_CPU_HIT, /* struct rtnl_link_stats64 */
+ IFLA_OFFLOAD_XSTATS_HW_S_INFO, /* HW stats info. A nest */
+ IFLA_OFFLOAD_XSTATS_L3_STATS, /* struct rtnl_link_stats64 */
__IFLA_OFFLOAD_XSTATS_MAX
};
#define IFLA_OFFLOAD_XSTATS_MAX (__IFLA_OFFLOAD_XSTATS_MAX - 1)
+enum {
+ IFLA_OFFLOAD_XSTATS_HW_S_INFO_UNSPEC,
+ IFLA_OFFLOAD_XSTATS_HW_S_INFO_REQUEST, /* u8 */
+ IFLA_OFFLOAD_XSTATS_HW_S_INFO_USED, /* u8 */
+ __IFLA_OFFLOAD_XSTATS_HW_S_INFO_MAX,
+};
+#define IFLA_OFFLOAD_XSTATS_HW_S_INFO_MAX \
+ (__IFLA_OFFLOAD_XSTATS_HW_S_INFO_MAX - 1)
+
/* XDP section */
#define XDP_FLAGS_UPDATE_IF_NOEXIST (1U << 0)
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index d79e2c26b494..0db745cc3f11 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -5091,10 +5091,110 @@ rtnl_offload_xstats_fill_ndo(struct net_device *dev, int attr_id,
return 0;
}
+static unsigned int
+rtnl_offload_xstats_get_size_stats(const struct net_device *dev,
+ enum netdev_offload_xstats_type type)
+{
+ bool enabled = netdev_offload_xstats_enabled(dev, type);
+
+ return enabled ? sizeof(struct rtnl_link_stats64) : 0;
+}
+
+struct rtnl_offload_xstats_request_used {
+ bool request;
+ bool used;
+};
+
+static int
+rtnl_offload_xstats_get_stats(struct net_device *dev,
+ enum netdev_offload_xstats_type type,
+ struct rtnl_offload_xstats_request_used *ru,
+ struct rtnl_link_stats64 *stats,
+ struct netlink_ext_ack *extack)
+{
+ bool request;
+ bool used;
+ int err;
+
+ request = netdev_offload_xstats_enabled(dev, type);
+ if (!request) {
+ used = false;
+ goto out;
+ }
+
+ err = netdev_offload_xstats_get(dev, type, stats, &used, extack);
+ if (err)
+ return err;
+
+out:
+ if (ru) {
+ ru->request = request;
+ ru->used = used;
+ }
+ return 0;
+}
+
+static int
+rtnl_offload_xstats_fill_hw_s_info_one(struct sk_buff *skb, int attr_id,
+ struct rtnl_offload_xstats_request_used *ru)
+{
+ struct nlattr *nest;
+
+ nest = nla_nest_start(skb, attr_id);
+ if (!nest)
+ return -EMSGSIZE;
+
+ if (nla_put_u8(skb, IFLA_OFFLOAD_XSTATS_HW_S_INFO_REQUEST, ru->request))
+ goto nla_put_failure;
+
+ if (nla_put_u8(skb, IFLA_OFFLOAD_XSTATS_HW_S_INFO_USED, ru->used))
+ goto nla_put_failure;
+
+ nla_nest_end(skb, nest);
+ return 0;
+
+nla_put_failure:
+ nla_nest_cancel(skb, nest);
+ return -EMSGSIZE;
+}
+
+static int
+rtnl_offload_xstats_fill_hw_s_info(struct sk_buff *skb, struct net_device *dev,
+ struct netlink_ext_ack *extack)
+{
+ enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
+ struct rtnl_offload_xstats_request_used ru_l3;
+ struct nlattr *nest;
+ int err;
+
+ err = rtnl_offload_xstats_get_stats(dev, t_l3, &ru_l3, NULL, extack);
+ if (err)
+ return err;
+
+ nest = nla_nest_start(skb, IFLA_OFFLOAD_XSTATS_HW_S_INFO);
+ if (!nest)
+ return -EMSGSIZE;
+
+ if (rtnl_offload_xstats_fill_hw_s_info_one(skb,
+ IFLA_OFFLOAD_XSTATS_L3_STATS,
+ &ru_l3))
+ goto nla_put_failure;
+
+ nla_nest_end(skb, nest);
+ return 0;
+
+nla_put_failure:
+ nla_nest_cancel(skb, nest);
+ return -EMSGSIZE;
+}
+
static int rtnl_offload_xstats_fill(struct sk_buff *skb, struct net_device *dev,
int *prividx, u32 off_filter_mask,
struct netlink_ext_ack *extack)
{
+ enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
+ int attr_id_hw_s_info = IFLA_OFFLOAD_XSTATS_HW_S_INFO;
+ int attr_id_l3_stats = IFLA_OFFLOAD_XSTATS_L3_STATS;
int attr_id_cpu_hit = IFLA_OFFLOAD_XSTATS_CPU_HIT;
bool have_data = false;
int err;
@@ -5111,6 +5211,40 @@ static int rtnl_offload_xstats_fill(struct sk_buff *skb, struct net_device *dev,
}
}
+ if (*prividx <= attr_id_hw_s_info &&
+ (off_filter_mask & IFLA_STATS_FILTER_BIT(attr_id_hw_s_info))) {
+ *prividx = attr_id_hw_s_info;
+
+ err = rtnl_offload_xstats_fill_hw_s_info(skb, dev, extack);
+ if (err)
+ return err;
+
+ have_data = true;
+ *prividx = 0;
+ }
+
+ if (*prividx <= attr_id_l3_stats &&
+ (off_filter_mask & IFLA_STATS_FILTER_BIT(attr_id_l3_stats))) {
+ unsigned int size_l3;
+ struct nlattr *attr;
+
+ *prividx = attr_id_l3_stats;
+
+ size_l3 = rtnl_offload_xstats_get_size_stats(dev, t_l3);
+ attr = nla_reserve_64bit(skb, attr_id_l3_stats, size_l3,
+ IFLA_OFFLOAD_XSTATS_UNSPEC);
+ if (!attr)
+ return -EMSGSIZE;
+
+ err = rtnl_offload_xstats_get_stats(dev, t_l3, NULL,
+ nla_data(attr), extack);
+ if (err)
+ return err;
+
+ have_data = true;
+ *prividx = 0;
+ }
+
if (!have_data)
return -ENODATA;
@@ -5118,9 +5252,35 @@ static int rtnl_offload_xstats_fill(struct sk_buff *skb, struct net_device *dev,
return 0;
}
+static unsigned int
+rtnl_offload_xstats_get_size_hw_s_info_one(const struct net_device *dev,
+ enum netdev_offload_xstats_type type)
+{
+ bool enabled = netdev_offload_xstats_enabled(dev, type);
+
+ return nla_total_size(0) +
+ /* IFLA_OFFLOAD_XSTATS_HW_S_INFO_REQUEST */
+ nla_total_size(sizeof(u8)) +
+ /* IFLA_OFFLOAD_XSTATS_HW_S_INFO_USED */
+ (enabled ? nla_total_size(sizeof(u8)) : 0) +
+ 0;
+}
+
+static unsigned int
+rtnl_offload_xstats_get_size_hw_s_info(const struct net_device *dev)
+{
+ enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
+
+ return nla_total_size(0) +
+ /* IFLA_OFFLOAD_XSTATS_L3_STATS */
+ rtnl_offload_xstats_get_size_hw_s_info_one(dev, t_l3) +
+ 0;
+}
+
static int rtnl_offload_xstats_get_size(const struct net_device *dev,
u32 off_filter_mask)
{
+ enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
int attr_id_cpu_hit = IFLA_OFFLOAD_XSTATS_CPU_HIT;
int nla_size = 0;
int size;
@@ -5131,6 +5291,16 @@ static int rtnl_offload_xstats_get_size(const struct net_device *dev,
nla_size += nla_total_size_64bit(size);
}
+ if (off_filter_mask &
+ IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_HW_S_INFO))
+ nla_size += rtnl_offload_xstats_get_size_hw_s_info(dev);
+
+ if (off_filter_mask &
+ IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_L3_STATS)) {
+ size = rtnl_offload_xstats_get_size_stats(dev, t_l3);
+ nla_size += nla_total_size_64bit(size);
+ }
+
if (nla_size != 0)
nla_size += nla_total_size(0);
--
2.33.1
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