Messages in this thread | | | Subject | Re: [PATCH v2 net-next 1/7] bpf: add 'flags' attribute to BPF_MAP_UPDATE_ELEM command | From | Hannes Frederic Sowa <> | Date | Fri, 14 Nov 2014 13:11:11 +0100 |
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On Do, 2014-11-13 at 17:36 -0800, Alexei Starovoitov wrote: > the current meaning of BPF_MAP_UPDATE_ELEM syscall command is: > either update existing map element or create a new one. > Initially the plan was to add a new command to handle the case of > 'create new element if it didn't exist', but 'flags' style looks > cleaner and overall diff is much smaller (more code reused), so add 'flags' > attribute to BPF_MAP_UPDATE_ELEM command with the following meaning: > #define BPF_ANY 0 /* create new element or update existing */ > #define BPF_NOEXIST 1 /* create new element if it didn't exist */ > #define BPF_EXIST 2 /* update existing element */
Would a cmpxchg-alike function be handy here?
Bye, Hannes
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