Hi Steffen, On Wed, Jan 31, 2018 at 12:13 AM, Steffen Klassert <steffen.klassert@xxxxxxxxxxx> wrote: > > I wonder which special usecase you have in mind that will be improved > by your patches. > This is not related to IPsec. We have an internal use case where the data buffer itself is a single memory page but the authentication tag needs to be in a separate buffer. This patch set allows us to have zero copy in that case. > > Maybe it would be better to investigate in the direction to > support SG operations with gcm-aesni instead of trying to > find all corner cases where the existing implementation can > do zero-copy. > Yes, if gcm-aesni could be implemented to handle arbitrarily fragmented buffers, that would be better, but it would likely be a much bigger and more complicated change. Just handling the case where the AAD/data/authtag are separate contiguous buffers is relatively simpler but still useful. Thanks, Junaid
