Commits on Dec 12, 2017

1. add padding to the end of structure …

   Commit 538a84e ("provide padded structure for
   table_{key|leaf}_desc API") added explicit padding, if needed,
   before every structure member.
   
   This is not enough as if an array of elements are returned
   from C++ to python side, the size of structure must be correct.
   
   This patch also adds padding after the last structure field
   to make structure size in python side consistent with C++
   side. With this patch, I experimented with the pull request
   for tcpretrans.py by Matthias Tafelmeier, the type
     struct ipv6_flow_key_t {
         unsigned __int128 saddr;
         unsigned __int128 daddr;
         u64 lport;
         u64 dport;
     }
   can be replaced with
     struct ipv6_flow_key_t {
         unsigned __int128 saddr;
         unsigned __int128 daddr;
         u16 lport;
         u16 dport;
     }
   where the original type of lport/dport is u16.
   Some other ipv6 related data structures can also be simplified.
   
   Signed-off-by: Yonghong Song <[email protected]>

   

   yonghong-song committed Dec 12, 2017
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