On 02/03/2015 11:04 PM, Ola Liljedahl wrote: > My alternative approach that should achieve that same goals as Petri > but give more freedom to implementations. You don't have to approve of > it, I just want to show that given a defined and understood problem, > many potential solutions exist and the first alternative might not be > the best. Let's work together. > > * init_seg_len: > On input: user's required (desired) minimal length of initial > segment (including headroom) > On output: implementation's best effort to match user's request > Purpose: ensure that those packet headers the application > normally will process are stored in a consecutive memory area. > Applications do not have to check any configuration in order > to initialize a configuration which the implementation anyway has to > check if it can support. > Applications should check output values to see if its desired > values were matched. The application decides whether a failure to > match is a fatal error or the application can handle the situation > anyway (e.g. with degraded performance because it has to do some > workarounds in SW). > > * seg_len: > On input: user's desired length of other segments > On output: implementation's best effort to match user's request > Purpose: a hint from the user how to partition to pool into > segments for best trade-off between memory utilization and SW > processing performance. > Note: I know some HW can support multiple segment sizes so I > think it is useful for the API to allow for this. Targets which only > support one segment size (per packet pool) could use e.g. > max(int_seg_len, seg_len). Some targets may not allow user-defined > segment sizes at all, the ODP implementation will just return the > actual values and the application can check whether those are > acceptable. > > * init_seg_num: > On input: Number of initial segments. > On output: Updated with actual number of segments if a shared > memory region was specified? > * seg_num: > On input: Number of other segments. > On output: Updated with actual number of segments if a shared > memory region was specified?
Wouldn't it be simpler to create two pools and assign both to Pktio? _______________________________________________ lng-odp mailing list lng-odp@lists.linaro.org http://lists.linaro.org/mailman/listinfo/lng-odp
