On Tue, Apr 28, 2020 at 06:49:02PM +0300, Iuliana Prodan wrote: > Added support for executing multiple, independent or not, requests > for crypto engine based on a retry mechanism. If hardware was unable > to execute a backlog request, enqueue it back in front of crypto-engine > queue, to keep the order of requests. > > Now do_one_request() returns: > >= 0: hardware executed the request successfully; > < 0: this is the old error path. If hardware has support for retry > mechanism, the backlog request is put back in front of crypto-engine > queue. For backwards compatibility, if the retry support is not available, > the crypto-engine will work as before. > If hardware queue is full (-ENOSPC), requeue request regardless > of MAY_BACKLOG flag. > If hardware throws any other error code (like -EIO, -EINVAL, > -ENOMEM, etc.) only MAY_BACKLOG requests are enqueued back into > crypto-engine's queue, since the others can be dropped. > > If hardware supports batch requests, crypto-engine can handle this use-case > through do_batch_requests callback. > > Since, these new features, cannot be supported by all hardware, > the crypto-engine framework is backward compatible: > - by using the crypto_engine_alloc_init function, to initialize > crypto-engine, the new callback is NULL and retry mechanism is > disabled, so crypto-engine will work as before these changes; > - to support multiple requests, in parallel, retry_support variable > must be set on true, in driver. > - to support batch requests, do_batch_requests callback must be > implemented in driver, to execute a batch of requests. The link > between the requests, is expected to be done in driver, in > do_one_request(). > > --- > Changes since V5: > - updated, in algapi, the crypto_enqueue_request_head function to > enqueue requests regardless of backlog flag; > - requeue request based on the error code returned by do_one_request(). > > Changes since V4: > - added, in algapi a function to add a request in front of queue; > - added a retry mechanism: if hardware is unable to execute > a backlog request, enqueue it back in front of crypto-engine > queue, to keep the order of requests. > > Changes since V3: > - removed can_enqueue_hardware callback and added a start-stop > mechanism based on the on the return value of do_one_request(). > > Changes since V2: > - readded cur_req in crypto-engine, to keep, the exact behavior as before > these changes, if can_enqueue_more is not implemented: send requests > to hardware, _one-by-one_, on crypto_pump_requests, and complete it, > on crypto_finalize_request, and so on. > - do_batch_requests is available only with can_enqueue_more. > > Changes since V1: > - changed the name of can_enqueue_hardware callback to can_enqueue_more, and > the argument of this callback to crypto_engine structure (for cases when more > than ore crypto-engine is used). > - added a new patch with support for batch requests. > > Changes since V0 (RFC): > - removed max_no_req and no_req, as the number of request that can be > processed in parallel; > - added a new callback, can_enqueue_more, to check whether the hardware > can process a new request. > > > Iuliana Prodan (3): > crypto: algapi - create function to add request in front of queue > crypto: engine - support for parallel requests based on retry > mechanism > crypto: engine - support for batch requests > > crypto/algapi.c | 8 +++ > crypto/crypto_engine.c | 171 +++++++++++++++++++++++++++++++++++++++--------- > include/crypto/algapi.h | 2 + > include/crypto/engine.h | 15 ++++- > 4 files changed, 164 insertions(+), 32 deletions(-) All applied. Thanks. -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
