On Thu, 8 Oct 2020 16:35:34 +1100 Herbert Xu wrote: > Jakub Kicinski <k...@kernel.org> wrote: > > > > Why would the driver return EBUSY from an async API? What's the caller > > supposed to do with that? > > The Crypto API offers two modes for callers to deal with congestion. > If the request can be safely dropped (e.g., IPsec) then ENOSPC will > be returned and should be dealt with accordingly. > > If the request cannot be dropped then EBUSY is returned to indicate > congestion, and the caller must refrain from issuing any more > requests until the Crypto API signals that there is space for them. > > The request flag CRYPTO_TFM_REQ_MAY_BACKLOG is used to indicate > which mode you wish to use.
Are you saying that if we set CRYPTO_TFM_REQ_MAY_BACKLOG we should never see ENOSPC with a correctly functioning driver? Or do we need to handle both errors, regardless?
