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ab63a2387c
The ethtool-nl family does a good job exposing various protocol related and IEEE/IETF statistics which used to get dumped under ethtool -S, with creative names. Queue stats don't have a netlink API, yet, and remain a lion's share of ethtool -S output for new drivers. Not only is that bad because the names differ driver to driver but it's also bug-prone. Intuitively drivers try to report only the stats for active queues, but querying ethtool stats involves multiple system calls, and the number of stats is read separately from the stats themselves. Worse still when user space asks for values of the stats, it doesn't inform the kernel how big the buffer is. If number of stats increases in the meantime kernel will overflow user buffer. Add a netlink API for dumping queue stats. Queue information is exposed via the netdev-genl family, so add the stats there. Support per-queue and sum-for-device dumps. Latter will be useful when subsequent patches add more interesting common stats than just bytes and packets. The API does not currently distinguish between HW and SW stats. The expectation is that the source of the stats will either not matter much (good packets) or be obvious (skb alloc errors). Acked-by: Stanislav Fomichev <sdf@google.com> Reviewed-by: Amritha Nambiar <amritha.nambiar@intel.com> Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> Link: https://lore.kernel.org/r/20240306195509.1502746-2-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
41 lines
1.5 KiB
C
41 lines
1.5 KiB
C
/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
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/* Do not edit directly, auto-generated from: */
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/* Documentation/netlink/specs/netdev.yaml */
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/* YNL-GEN kernel header */
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#ifndef _LINUX_NETDEV_GEN_H
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#define _LINUX_NETDEV_GEN_H
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#include <net/netlink.h>
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#include <net/genetlink.h>
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#include <uapi/linux/netdev.h>
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/* Common nested types */
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extern const struct nla_policy netdev_page_pool_info_nl_policy[NETDEV_A_PAGE_POOL_IFINDEX + 1];
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int netdev_nl_dev_get_doit(struct sk_buff *skb, struct genl_info *info);
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int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb);
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int netdev_nl_page_pool_get_doit(struct sk_buff *skb, struct genl_info *info);
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int netdev_nl_page_pool_get_dumpit(struct sk_buff *skb,
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struct netlink_callback *cb);
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int netdev_nl_page_pool_stats_get_doit(struct sk_buff *skb,
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struct genl_info *info);
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int netdev_nl_page_pool_stats_get_dumpit(struct sk_buff *skb,
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struct netlink_callback *cb);
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int netdev_nl_queue_get_doit(struct sk_buff *skb, struct genl_info *info);
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int netdev_nl_queue_get_dumpit(struct sk_buff *skb,
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struct netlink_callback *cb);
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int netdev_nl_napi_get_doit(struct sk_buff *skb, struct genl_info *info);
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int netdev_nl_napi_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb);
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int netdev_nl_qstats_get_dumpit(struct sk_buff *skb,
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struct netlink_callback *cb);
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enum {
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NETDEV_NLGRP_MGMT,
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NETDEV_NLGRP_PAGE_POOL,
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};
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extern struct genl_family netdev_nl_family;
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#endif /* _LINUX_NETDEV_GEN_H */
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