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tcp: Avoid preprocessor directives in tracepoint macro args
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Using a preprocessor directive to check for CONFIG_IPV6 in the middle of
a DECLARE_EVENT_CLASS macro's arg list causes sparse to report a series
of errors:

./include/trace/events/tcp.h:68:1: error: directive in argument list
./include/trace/events/tcp.h:75:1: error: directive in argument list
./include/trace/events/tcp.h:144:1: error: directive in argument list
./include/trace/events/tcp.h:151:1: error: directive in argument list
./include/trace/events/tcp.h:216:1: error: directive in argument list
./include/trace/events/tcp.h:223:1: error: directive in argument list
./include/trace/events/tcp.h:274:1: error: directive in argument list
./include/trace/events/tcp.h:281:1: error: directive in argument list

Once sparse finds an error, it stops printing warnings for the file it
is checking. This masks any sparse warnings that would normally be
reported for the core TCP code.

Instead, handle the preprocessor conditionals in a couple of auxiliary
macros. This also has the benefit of reducing duplicate code.

Cc: David Ahern <dsahern@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Mat Martineau authored and David S. Miller committed Dec 26, 2017
1 parent 3a33a19 commit 6a6b0b9
Showing 1 changed file with 37 additions and 60 deletions.
97 changes: 37 additions & 60 deletions include/trace/events/tcp.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,35 @@
tcp_state_name(TCP_CLOSING), \
tcp_state_name(TCP_NEW_SYN_RECV))

#define TP_STORE_V4MAPPED(__entry, saddr, daddr) \
do { \
struct in6_addr *pin6; \
\
pin6 = (struct in6_addr *)__entry->saddr_v6; \
ipv6_addr_set_v4mapped(saddr, pin6); \
pin6 = (struct in6_addr *)__entry->daddr_v6; \
ipv6_addr_set_v4mapped(daddr, pin6); \
} while (0)

#if IS_ENABLED(CONFIG_IPV6)
#define TP_STORE_ADDRS(__entry, saddr, daddr, saddr6, daddr6) \
do { \
if (sk->sk_family == AF_INET6) { \
struct in6_addr *pin6; \
\
pin6 = (struct in6_addr *)__entry->saddr_v6; \
*pin6 = saddr6; \
pin6 = (struct in6_addr *)__entry->daddr_v6; \
*pin6 = daddr6; \
} else { \
TP_STORE_V4MAPPED(__entry, saddr, daddr); \
} \
} while (0)
#else
#define TP_STORE_ADDRS(__entry, saddr, daddr, saddr6, daddr6) \
TP_STORE_V4MAPPED(__entry, saddr, daddr)
#endif

/*
* tcp event with arguments sk and skb
*
Expand All @@ -50,7 +79,6 @@ DECLARE_EVENT_CLASS(tcp_event_sk_skb,

TP_fast_assign(
struct inet_sock *inet = inet_sk(sk);
struct in6_addr *pin6;
__be32 *p32;

__entry->skbaddr = skb;
Expand All @@ -65,20 +93,8 @@ DECLARE_EVENT_CLASS(tcp_event_sk_skb,
p32 = (__be32 *) __entry->daddr;
*p32 = inet->inet_daddr;

#if IS_ENABLED(CONFIG_IPV6)
if (sk->sk_family == AF_INET6) {
pin6 = (struct in6_addr *)__entry->saddr_v6;
*pin6 = sk->sk_v6_rcv_saddr;
pin6 = (struct in6_addr *)__entry->daddr_v6;
*pin6 = sk->sk_v6_daddr;
} else
#endif
{
pin6 = (struct in6_addr *)__entry->saddr_v6;
ipv6_addr_set_v4mapped(inet->inet_saddr, pin6);
pin6 = (struct in6_addr *)__entry->daddr_v6;
ipv6_addr_set_v4mapped(inet->inet_daddr, pin6);
}
TP_STORE_ADDRS(__entry, inet->inet_saddr, inet->inet_daddr,
sk->sk_v6_rcv_saddr, sk->sk_v6_daddr);
),

TP_printk("sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c",
Expand Down Expand Up @@ -127,7 +143,6 @@ DECLARE_EVENT_CLASS(tcp_event_sk,

TP_fast_assign(
struct inet_sock *inet = inet_sk(sk);
struct in6_addr *pin6;
__be32 *p32;

__entry->skaddr = sk;
Expand All @@ -141,20 +156,8 @@ DECLARE_EVENT_CLASS(tcp_event_sk,
p32 = (__be32 *) __entry->daddr;
*p32 = inet->inet_daddr;

#if IS_ENABLED(CONFIG_IPV6)
if (sk->sk_family == AF_INET6) {
pin6 = (struct in6_addr *)__entry->saddr_v6;
*pin6 = sk->sk_v6_rcv_saddr;
pin6 = (struct in6_addr *)__entry->daddr_v6;
*pin6 = sk->sk_v6_daddr;
} else
#endif
{
pin6 = (struct in6_addr *)__entry->saddr_v6;
ipv6_addr_set_v4mapped(inet->inet_saddr, pin6);
pin6 = (struct in6_addr *)__entry->daddr_v6;
ipv6_addr_set_v4mapped(inet->inet_daddr, pin6);
}
TP_STORE_ADDRS(__entry, inet->inet_saddr, inet->inet_daddr,
sk->sk_v6_rcv_saddr, sk->sk_v6_daddr);
),

TP_printk("sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c",
Expand Down Expand Up @@ -197,7 +200,6 @@ TRACE_EVENT(tcp_set_state,

TP_fast_assign(
struct inet_sock *inet = inet_sk(sk);
struct in6_addr *pin6;
__be32 *p32;

__entry->skaddr = sk;
Expand All @@ -213,20 +215,8 @@ TRACE_EVENT(tcp_set_state,
p32 = (__be32 *) __entry->daddr;
*p32 = inet->inet_daddr;

#if IS_ENABLED(CONFIG_IPV6)
if (sk->sk_family == AF_INET6) {
pin6 = (struct in6_addr *)__entry->saddr_v6;
*pin6 = sk->sk_v6_rcv_saddr;
pin6 = (struct in6_addr *)__entry->daddr_v6;
*pin6 = sk->sk_v6_daddr;
} else
#endif
{
pin6 = (struct in6_addr *)__entry->saddr_v6;
ipv6_addr_set_v4mapped(inet->inet_saddr, pin6);
pin6 = (struct in6_addr *)__entry->daddr_v6;
ipv6_addr_set_v4mapped(inet->inet_daddr, pin6);
}
TP_STORE_ADDRS(__entry, inet->inet_saddr, inet->inet_daddr,
sk->sk_v6_rcv_saddr, sk->sk_v6_daddr);
),

TP_printk("sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c oldstate=%s newstate=%s",
Expand Down Expand Up @@ -256,7 +246,6 @@ TRACE_EVENT(tcp_retransmit_synack,

TP_fast_assign(
struct inet_request_sock *ireq = inet_rsk(req);
struct in6_addr *pin6;
__be32 *p32;

__entry->skaddr = sk;
Expand All @@ -271,20 +260,8 @@ TRACE_EVENT(tcp_retransmit_synack,
p32 = (__be32 *) __entry->daddr;
*p32 = ireq->ir_rmt_addr;

#if IS_ENABLED(CONFIG_IPV6)
if (sk->sk_family == AF_INET6) {
pin6 = (struct in6_addr *)__entry->saddr_v6;
*pin6 = ireq->ir_v6_loc_addr;
pin6 = (struct in6_addr *)__entry->daddr_v6;
*pin6 = ireq->ir_v6_rmt_addr;
} else
#endif
{
pin6 = (struct in6_addr *)__entry->saddr_v6;
ipv6_addr_set_v4mapped(ireq->ir_loc_addr, pin6);
pin6 = (struct in6_addr *)__entry->daddr_v6;
ipv6_addr_set_v4mapped(ireq->ir_rmt_addr, pin6);
}
TP_STORE_ADDRS(__entry, ireq->ir_loc_addr, ireq->ir_rmt_addr,
ireq->ir_v6_loc_addr, ireq->ir_v6_rmt_addr);
),

TP_printk("sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c",
Expand Down

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