tcpdrop: reduce data struct size

tools/tcpdrop.py

@@ -52,29 +52,28 @@
 
 // separate data structs for ipv4 and ipv6
 struct ipv4_data_t {
- // XXX: switch some to u32's when supported
- u64 pid;
+ u32 pid;
  u64 ip;
  u64 saddr;
  u64 daddr;
- u64 sport;
- u64 dport;
- u64 state;
- u64 tcpflags;
- u64 stack_id;
+ u16 sport;
+ u16 dport;
+ u8 state;
+ u8 tcpflags;
+ u32 stack_id;
 };
 BPF_PERF_OUTPUT(ipv4_events);
 
 struct ipv6_data_t {
- u64 pid;
+ u32 pid;
  u64 ip;
  unsigned __int128 saddr;
  unsigned __int128 daddr;
- u64 sport;
- u64 dport;
- u64 state;
- u64 tcpflags;
- u64 stack_id;
+ u16 sport;
+ u16 dport;
+ u8 state;
+ u8 tcpflags;
+ u32 stack_id;
 };
 BPF_PERF_OUTPUT(ipv6_events);
 
@@ -152,28 +151,28 @@
 # event data
 class Data_ipv4(ct.Structure):
  _fields_ = [
- ("pid", ct.c_ulonglong),
+ ("pid", ct.c_ulong),
  ("ip", ct.c_ulonglong),
  ("saddr", ct.c_ulonglong),
  ("daddr", ct.c_ulonglong),
- ("sport", ct.c_ulonglong),
- ("dport", ct.c_ulonglong),
- ("state", ct.c_ulonglong),
- ("tcpflags", ct.c_ulonglong),
- ("stack_id", ct.c_ulonglong)
+ ("sport", ct.c_ushort),
+ ("dport", ct.c_ushort),
+ ("state", ct.c_ubyte),
+ ("tcpflags", ct.c_ubyte),
+ ("stack_id", ct.c_ulong)
  ]
 
 class Data_ipv6(ct.Structure):
  _fields_ = [
- ("pid", ct.c_ulonglong),
+ ("pid", ct.c_ulong),
  ("ip", ct.c_ulonglong),
  ("saddr", (ct.c_ulonglong * 2)),
  ("daddr", (ct.c_ulonglong * 2)),
- ("sport", ct.c_ulonglong),
- ("dport", ct.c_ulonglong),
- ("state", ct.c_ulonglong),
- ("tcpflags", ct.c_ulonglong),
- ("stack_id", ct.c_ulonglong)
+ ("sport", ct.c_ushort),
+ ("dport", ct.c_ushort),
+ ("state", ct.c_ubyte),
+ ("tcpflags", ct.c_ubyte),
+ ("stack_id", ct.c_ulong)
  ]
 
 # process event