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Subject: [PATCH net-next v4 3/3] net: dropreason: reformat the comment fo skb drop reasons
Date:   Mon,  6 Jun 2022 10:24:36 +0800
Message-Id: <20220606022436.331005-4-imagedong@tencent.com>
In-Reply-To: <20220606022436.331005-1-imagedong@tencent.com>
References: <20220606022436.331005-1-imagedong@tencent.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Menglong Dong <imagedong@tencent.com>

To make the code clear, reformat the comment in dropreason.h to k-doc
style.

Now, the comment can pass the check of kernel-doc without warnning:

$ ./scripts/kernel-doc -v -none include/linux/dropreason.h
include/linux/dropreason.h:7: info: Scanning doc for enum skb_drop_reason

Signed-off-by: Menglong Dong <imagedong@tencent.com>
---
v4:
- remove some useless comment (Jakub Kicinski)
v2:
- make the comment inline (Jakub Kicinski)
---
 include/net/dropreason.h | 382 +++++++++++++++++++++++----------------
 1 file changed, 226 insertions(+), 156 deletions(-)

diff --git a/include/net/dropreason.h b/include/net/dropreason.h
index 013ff0f2543e..fae9b40e54fa 100644
--- a/include/net/dropreason.h
+++ b/include/net/dropreason.h
@@ -3,168 +3,238 @@
 #ifndef _LINUX_DROPREASON_H
 #define _LINUX_DROPREASON_H
 
-/* The reason of skb drop, which is used in kfree_skb_reason().
- * en...maybe they should be splited by group?
+/**
+ * enum skb_drop_reason - the reasons of skb drops
  *
- * Each item here should also be in 'TRACE_SKB_DROP_REASON', which is
- * used to translate the reason to string.
+ * The reason of skb drop, which is used in kfree_skb_reason().
  */
 enum skb_drop_reason {
+	/**
+	 * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case)
+	 */
 	SKB_NOT_DROPPED_YET = 0,
-	SKB_DROP_REASON_NOT_SPECIFIED,	/* drop reason is not specified */
-	SKB_DROP_REASON_NO_SOCKET,	/* socket not found */
-	SKB_DROP_REASON_PKT_TOO_SMALL,	/* packet size is too small */
-	SKB_DROP_REASON_TCP_CSUM,	/* TCP checksum error */
-	SKB_DROP_REASON_SOCKET_FILTER,	/* dropped by socket filter */
-	SKB_DROP_REASON_UDP_CSUM,	/* UDP checksum error */
-	SKB_DROP_REASON_NETFILTER_DROP,	/* dropped by netfilter */
-	SKB_DROP_REASON_OTHERHOST,	/* packet don't belong to current
-					 * host (interface is in promisc
-					 * mode)
-					 */
-	SKB_DROP_REASON_IP_CSUM,	/* IP checksum error */
-	SKB_DROP_REASON_IP_INHDR,	/* there is something wrong with
-					 * IP header (see
-					 * IPSTATS_MIB_INHDRERRORS)
-					 */
-	SKB_DROP_REASON_IP_RPFILTER,	/* IP rpfilter validate failed.
-					 * see the document for rp_filter
-					 * in ip-sysctl.rst for more
-					 * information
-					 */
-	SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST, /* destination address of L2
-						  * is multicast, but L3 is
-						  * unicast.
-						  */
-	SKB_DROP_REASON_XFRM_POLICY,	/* xfrm policy check failed */
-	SKB_DROP_REASON_IP_NOPROTO,	/* no support for IP protocol */
-	SKB_DROP_REASON_SOCKET_RCVBUFF,	/* socket receive buff is full */
-	SKB_DROP_REASON_PROTO_MEM,	/* proto memory limition, such as
-					 * udp packet drop out of
-					 * udp_memory_allocated.
-					 */
-	SKB_DROP_REASON_TCP_MD5NOTFOUND,	/* no MD5 hash and one
-						 * expected, corresponding
-						 * to LINUX_MIB_TCPMD5NOTFOUND
-						 */
-	SKB_DROP_REASON_TCP_MD5UNEXPECTED,	/* MD5 hash and we're not
-						 * expecting one, corresponding
-						 * to LINUX_MIB_TCPMD5UNEXPECTED
-						 */
-	SKB_DROP_REASON_TCP_MD5FAILURE,	/* MD5 hash and its wrong,
-					 * corresponding to
-					 * LINUX_MIB_TCPMD5FAILURE
-					 */
-	SKB_DROP_REASON_SOCKET_BACKLOG,	/* failed to add skb to socket
-					 * backlog (see
-					 * LINUX_MIB_TCPBACKLOGDROP)
-					 */
-	SKB_DROP_REASON_TCP_FLAGS,	/* TCP flags invalid */
-	SKB_DROP_REASON_TCP_ZEROWINDOW,	/* TCP receive window size is zero,
-					 * see LINUX_MIB_TCPZEROWINDOWDROP
-					 */
-	SKB_DROP_REASON_TCP_OLD_DATA,	/* the TCP data reveived is already
-					 * received before (spurious retrans
-					 * may happened), see
-					 * LINUX_MIB_DELAYEDACKLOST
-					 */
-	SKB_DROP_REASON_TCP_OVERWINDOW,	/* the TCP data is out of window,
-					 * the seq of the first byte exceed
-					 * the right edges of receive
-					 * window
-					 */
-	SKB_DROP_REASON_TCP_OFOMERGE,	/* the data of skb is already in
-					 * the ofo queue, corresponding to
-					 * LINUX_MIB_TCPOFOMERGE
-					 */
-	SKB_DROP_REASON_TCP_RFC7323_PAWS, /* PAWS check, corresponding to
-					   * LINUX_MIB_PAWSESTABREJECTED
-					   */
-	SKB_DROP_REASON_TCP_INVALID_SEQUENCE, /* Not acceptable SEQ field */
-	SKB_DROP_REASON_TCP_RESET,	/* Invalid RST packet */
-	SKB_DROP_REASON_TCP_INVALID_SYN, /* Incoming packet has unexpected SYN flag */
-	SKB_DROP_REASON_TCP_CLOSE,	/* TCP socket in CLOSE state */
-	SKB_DROP_REASON_TCP_FASTOPEN,	/* dropped by FASTOPEN request socket */
-	SKB_DROP_REASON_TCP_OLD_ACK,	/* TCP ACK is old, but in window */
-	SKB_DROP_REASON_TCP_TOO_OLD_ACK, /* TCP ACK is too old */
-	SKB_DROP_REASON_TCP_ACK_UNSENT_DATA, /* TCP ACK for data we haven't sent yet */
-	SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE, /* pruned from TCP OFO queue */
-	SKB_DROP_REASON_TCP_OFO_DROP,	/* data already in receive queue */
-	SKB_DROP_REASON_IP_OUTNOROUTES,	/* route lookup failed */
-	SKB_DROP_REASON_BPF_CGROUP_EGRESS,	/* dropped by
-						 * BPF_PROG_TYPE_CGROUP_SKB
-						 * eBPF program
-						 */
-	SKB_DROP_REASON_IPV6DISABLED,	/* IPv6 is disabled on the device */
-	SKB_DROP_REASON_NEIGH_CREATEFAIL,	/* failed to create neigh
-						 * entry
-						 */
-	SKB_DROP_REASON_NEIGH_FAILED,	/* neigh entry in failed state */
-	SKB_DROP_REASON_NEIGH_QUEUEFULL,	/* arp_queue for neigh
-						 * entry is full
-						 */
-	SKB_DROP_REASON_NEIGH_DEAD,	/* neigh entry is dead */
-	SKB_DROP_REASON_TC_EGRESS,	/* dropped in TC egress HOOK */
-	SKB_DROP_REASON_QDISC_DROP,	/* dropped by qdisc when packet
-					 * outputting (failed to enqueue to
-					 * current qdisc)
-					 */
-	SKB_DROP_REASON_CPU_BACKLOG,	/* failed to enqueue the skb to
-					 * the per CPU backlog queue. This
-					 * can be caused by backlog queue
-					 * full (see netdev_max_backlog in
-					 * net.rst) or RPS flow limit
-					 */
-	SKB_DROP_REASON_XDP,		/* dropped by XDP in input path */
-	SKB_DROP_REASON_TC_INGRESS,	/* dropped in TC ingress HOOK */
-	SKB_DROP_REASON_UNHANDLED_PROTO,	/* protocol not implemented
-						 * or not supported
-						 */
-	SKB_DROP_REASON_SKB_CSUM,	/* sk_buff checksum computation
-					 * error
-					 */
-	SKB_DROP_REASON_SKB_GSO_SEG,	/* gso segmentation error */
-	SKB_DROP_REASON_SKB_UCOPY_FAULT,	/* failed to copy data from
-						 * user space, e.g., via
-						 * zerocopy_sg_from_iter()
-						 * or skb_orphan_frags_rx()
-						 */
-	SKB_DROP_REASON_DEV_HDR,	/* device driver specific
-					 * header/metadata is invalid
-					 */
-	/* the device is not ready to xmit/recv due to any of its data
-	 * structure that is not up/ready/initialized, e.g., the IFF_UP is
-	 * not set, or driver specific tun->tfiles[txq] is not initialized
+	/** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */
+	SKB_DROP_REASON_NOT_SPECIFIED,
+	/** @SKB_DROP_REASON_NO_SOCKET: socket not found */
+	SKB_DROP_REASON_NO_SOCKET,
+	/** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */
+	SKB_DROP_REASON_PKT_TOO_SMALL,
+	/** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */
+	SKB_DROP_REASON_TCP_CSUM,
+	/** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */
+	SKB_DROP_REASON_SOCKET_FILTER,
+	/** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */
+	SKB_DROP_REASON_UDP_CSUM,
+	/** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */
+	SKB_DROP_REASON_NETFILTER_DROP,
+	/**
+	 * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host
+	 * (interface is in promisc mode)
+	 */
+	SKB_DROP_REASON_OTHERHOST,
+	/** @SKB_DROP_REASON_IP_CSUM: IP checksum error */
+	SKB_DROP_REASON_IP_CSUM,
+	/**
+	 * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see
+	 * IPSTATS_MIB_INHDRERRORS)
+	 */
+	SKB_DROP_REASON_IP_INHDR,
+	/**
+	 * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the
+	 * document for rp_filter in ip-sysctl.rst for more information
+	 */
+	SKB_DROP_REASON_IP_RPFILTER,
+	/**
+	 * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is
+	 * multicast, but L3 is unicast.
+	 */
+	SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST,
+	/** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */
+	SKB_DROP_REASON_XFRM_POLICY,
+	/** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */
+	SKB_DROP_REASON_IP_NOPROTO,
+	/** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */
+	SKB_DROP_REASON_SOCKET_RCVBUFF,
+	/**
+	 * @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet
+	 * drop out of udp_memory_allocated.
+	 */
+	SKB_DROP_REASON_PROTO_MEM,
+	/**
+	 * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected,
+	 * corresponding to LINUX_MIB_TCPMD5NOTFOUND
+	 */
+	SKB_DROP_REASON_TCP_MD5NOTFOUND,
+	/**
+	 * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting
+	 * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED
+	 */
+	SKB_DROP_REASON_TCP_MD5UNEXPECTED,
+	/**
+	 * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding
+	 * to LINUX_MIB_TCPMD5FAILURE
+	 */
+	SKB_DROP_REASON_TCP_MD5FAILURE,
+	/**
+	 * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog (
+	 * see LINUX_MIB_TCPBACKLOGDROP)
+	 */
+	SKB_DROP_REASON_SOCKET_BACKLOG,
+	/** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */
+	SKB_DROP_REASON_TCP_FLAGS,
+	/**
+	 * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,
+	 * see LINUX_MIB_TCPZEROWINDOWDROP
+	 */
+	SKB_DROP_REASON_TCP_ZEROWINDOW,
+	/**
+	 * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already
+	 * received before (spurious retrans may happened), see
+	 * LINUX_MIB_DELAYEDACKLOST
+	 */
+	SKB_DROP_REASON_TCP_OLD_DATA,
+	/**
+	 * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window,
+	 * the seq of the first byte exceed the right edges of receive
+	 * window
+	 */
+	SKB_DROP_REASON_TCP_OVERWINDOW,
+	/**
+	 * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo
+	 * queue, corresponding to LINUX_MIB_TCPOFOMERGE
+	 */
+	SKB_DROP_REASON_TCP_OFOMERGE,
+	/**
+	 * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
+	 * LINUX_MIB_PAWSESTABREJECTED
+	 */
+	SKB_DROP_REASON_TCP_RFC7323_PAWS,
+	/** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */
+	SKB_DROP_REASON_TCP_INVALID_SEQUENCE,
+	/** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */
+	SKB_DROP_REASON_TCP_RESET,
+	/**
+	 * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected
+	 * SYN flag
+	 */
+	SKB_DROP_REASON_TCP_INVALID_SYN,
+	/** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */
+	SKB_DROP_REASON_TCP_CLOSE,
+	/** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */
+	SKB_DROP_REASON_TCP_FASTOPEN,
+	/** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */
+	SKB_DROP_REASON_TCP_OLD_ACK,
+	/** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */
+	SKB_DROP_REASON_TCP_TOO_OLD_ACK,
+	/**
+	 * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't
+	 * sent yet
+	 */
+	SKB_DROP_REASON_TCP_ACK_UNSENT_DATA,
+	/** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */
+	SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE,
+	/** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */
+	SKB_DROP_REASON_TCP_OFO_DROP,
+	/** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */
+	SKB_DROP_REASON_IP_OUTNOROUTES,
+	/**
+	 * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB
+	 * eBPF program
+	 */
+	SKB_DROP_REASON_BPF_CGROUP_EGRESS,
+	/** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */
+	SKB_DROP_REASON_IPV6DISABLED,
+	/** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */
+	SKB_DROP_REASON_NEIGH_CREATEFAIL,
+	/** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */
+	SKB_DROP_REASON_NEIGH_FAILED,
+	/** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */
+	SKB_DROP_REASON_NEIGH_QUEUEFULL,
+	/** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */
+	SKB_DROP_REASON_NEIGH_DEAD,
+	/** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */
+	SKB_DROP_REASON_TC_EGRESS,
+	/**
+	 * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting (
+	 * failed to enqueue to current qdisc)
+	 */
+	SKB_DROP_REASON_QDISC_DROP,
+	/**
+	 * @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU
+	 * backlog queue. This can be caused by backlog queue full (see
+	 * netdev_max_backlog in net.rst) or RPS flow limit
+	 */
+	SKB_DROP_REASON_CPU_BACKLOG,
+	/** @SKB_DROP_REASON_XDP: dropped by XDP in input path */
+	SKB_DROP_REASON_XDP,
+	/** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */
+	SKB_DROP_REASON_TC_INGRESS,
+	/** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */
+	SKB_DROP_REASON_UNHANDLED_PROTO,
+	/** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */
+	SKB_DROP_REASON_SKB_CSUM,
+	/** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */
+	SKB_DROP_REASON_SKB_GSO_SEG,
+	/**
+	 * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space,
+	 * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx()
+	 */
+	SKB_DROP_REASON_SKB_UCOPY_FAULT,
+	/** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */
+	SKB_DROP_REASON_DEV_HDR,
+	/**
+	 * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to
+	 * any of its data structure that is not up/ready/initialized,
+	 * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq]
+	 * is not initialized
 	 */
 	SKB_DROP_REASON_DEV_READY,
-	SKB_DROP_REASON_FULL_RING,	/* ring buffer is full */
-	SKB_DROP_REASON_NOMEM,		/* error due to OOM */
-	SKB_DROP_REASON_HDR_TRUNC,      /* failed to trunc/extract the header
-					 * from networking data, e.g., failed
-					 * to pull the protocol header from
-					 * frags via pskb_may_pull()
-					 */
-	SKB_DROP_REASON_TAP_FILTER,     /* dropped by (ebpf) filter directly
-					 * attached to tun/tap, e.g., via
-					 * TUNSETFILTEREBPF
-					 */
-	SKB_DROP_REASON_TAP_TXFILTER,	/* dropped by tx filter implemented
-					 * at tun/tap, e.g., check_filter()
-					 */
-	SKB_DROP_REASON_ICMP_CSUM,	/* ICMP checksum error */
-	SKB_DROP_REASON_INVALID_PROTO,	/* the packet doesn't follow RFC
-					 * 2211, such as a broadcasts
-					 * ICMP_TIMESTAMP
-					 */
-	SKB_DROP_REASON_IP_INADDRERRORS,	/* host unreachable, corresponding
-						 * to IPSTATS_MIB_INADDRERRORS
-						 */
-	SKB_DROP_REASON_IP_INNOROUTES,	/* network unreachable, corresponding
-					 * to IPSTATS_MIB_INADDRERRORS
-					 */
-	SKB_DROP_REASON_PKT_TOO_BIG,	/* packet size is too big (maybe exceed
-					 * the MTU)
-					 */
+	/** @SKB_DROP_REASON_FULL_RING: ring buffer is full */
+	SKB_DROP_REASON_FULL_RING,
+	/** @SKB_DROP_REASON_NOMEM: error due to OOM */
+	SKB_DROP_REASON_NOMEM,
+	/**
+	 * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from
+	 * networking data, e.g., failed to pull the protocol header from
+	 * frags via pskb_may_pull()
+	 */
+	SKB_DROP_REASON_HDR_TRUNC,
+	/**
+	 * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached
+	 * to tun/tap, e.g., via TUNSETFILTEREBPF
+	 */
+	SKB_DROP_REASON_TAP_FILTER,
+	/**
+	 * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at
+	 * tun/tap, e.g., check_filter()
+	 */
+	SKB_DROP_REASON_TAP_TXFILTER,
+	/** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */
+	SKB_DROP_REASON_ICMP_CSUM,
+	/**
+	 * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211,
+	 * such as a broadcasts ICMP_TIMESTAMP
+	 */
+	SKB_DROP_REASON_INVALID_PROTO,
+	/**
+	 * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to
+	 * IPSTATS_MIB_INADDRERRORS
+	 */
+	SKB_DROP_REASON_IP_INADDRERRORS,
+	/**
+	 * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to
+	 * IPSTATS_MIB_INADDRERRORS
+	 */
+	SKB_DROP_REASON_IP_INNOROUTES,
+	/**
+	 * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the
+	 * MTU)
+	 */
+	SKB_DROP_REASON_PKT_TOO_BIG,
+	/**
+	 * @SKB_DROP_REASON_MAX: the maximum of drop reason, which shouldn't be
+	 * used as a real 'reason'
+	 */
 	SKB_DROP_REASON_MAX,
 };
 
-- 
2.36.1