docs: net: page_pool: document PP_FLAG_DMA_SYNC_DEV parameters

Using PP_FLAG_DMA_SYNC_DEV is a bit confusing. It was perhaps
more obvious when it was introduced but the page pool use
has grown beyond XDP and beyond packet-per-page so now
making the heads and tails out of this feature is not
trivial.

Obviously making the API more user friendly would be
a better fix, but until someone steps up to do that
let's at least document what the parameters are.

Relevant discussion in the first Link.

Link: https://lore.kernel.org/all/[email protected]/
Reviewed-by: Randy Dunlap <[email protected]>
Reviewed-by: Michael Chan <[email protected]>
Acked-by: Jesper Dangaard Brouer <[email protected]>
Reviewed-by: Somnath Kotur <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

0 files changed, 0 insertions, 0 deletions