Re: [PATCH v1 1/4] Add SPAcc driver to Linux kernel

[Pavitrakumar Managutte <pavitrakumarm@vayavyalabs.com>]

Sure Easwar,
   Thanks for the feedback. I will try to split the patches into
smaller, more manageable ones.

Warm regards,
PK

On Mon, Apr 1, 2024 at 10:04 PM Easwar Hariharan
<eahariha@linux.microsoft.com> wrote:
>
> On 4/1/2024 12:21 AM, Pavitrakumar Managutte wrote:
> > Hi Easwar,
> >   My comments are embedded below. Also should I wait for more comments
> > from you or
> > should I go ahead and push v2 with the below fixes ?
> >
> > Warm regards,
> > PK
> >
>
> <snip>
>
> Please see more comments below, and go ahead and push a v2. If possible, split
> the series into more patches. I leave it to you to group them by file or logical
>  functionality, so long as each individual commit compiles neatly so as to not break
> future git bisects.
>
>
> On 3/28/2024 11:26 AM, Pavitrakumar M wrote:
> > Signed-off-by: shwetar <shwetar@vayavyalabs.com>
> > Signed-off-by: Pavitrakumar M <pavitrakumarm@vayavyalabs.com>
> > Acked-by: Ruud Derwig <Ruud.Derwig@synopsys.com>
> > ---
> >  drivers/crypto/dwc-spacc/spacc_aead.c      | 1382 ++++++++++
> >  drivers/crypto/dwc-spacc/spacc_ahash.c     | 1183 ++++++++
> >  drivers/crypto/dwc-spacc/spacc_core.c      | 2917 ++++++++++++++++++++
> >  drivers/crypto/dwc-spacc/spacc_core.h      |  839 ++++++
> >  drivers/crypto/dwc-spacc/spacc_device.c    |  324 +++
> >  drivers/crypto/dwc-spacc/spacc_device.h    |  236 ++
> >  drivers/crypto/dwc-spacc/spacc_hal.c       |  365 +++
> >  drivers/crypto/dwc-spacc/spacc_hal.h       |  113 +
> >  drivers/crypto/dwc-spacc/spacc_interrupt.c |  204 ++
> >  drivers/crypto/dwc-spacc/spacc_manager.c   |  670 +++++
> >  drivers/crypto/dwc-spacc/spacc_skcipher.c  |  754 +++++
> >  11 files changed, 8987 insertions(+)
> >  create mode 100644 drivers/crypto/dwc-spacc/spacc_aead.c
> >  create mode 100644 drivers/crypto/dwc-spacc/spacc_ahash.c
> >  create mode 100644 drivers/crypto/dwc-spacc/spacc_core.c
> >  create mode 100644 drivers/crypto/dwc-spacc/spacc_core.h
> >  create mode 100644 drivers/crypto/dwc-spacc/spacc_device.c
> >  create mode 100644 drivers/crypto/dwc-spacc/spacc_device.h
> >  create mode 100644 drivers/crypto/dwc-spacc/spacc_hal.c
> >  create mode 100644 drivers/crypto/dwc-spacc/spacc_hal.h
> >  create mode 100644 drivers/crypto/dwc-spacc/spacc_interrupt.c
> >  create mode 100644 drivers/crypto/dwc-spacc/spacc_manager.c
> >  create mode 100644 drivers/crypto/dwc-spacc/spacc_skcipher.c
> > diff --git a/drivers/crypto/dwc-spacc/spacc_ahash.c b/drivers/crypto/dwc-spacc/spacc_ahash.c
> > new file mode 100644
> > index 000000000000..53c76ee16c53
> > --- /dev/null
> > +++ b/drivers/crypto/dwc-spacc/spacc_ahash.c
> > @@ -0,0 +1,1183 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +
>
> <snip>
>
> > +
> > +static int spacc_hash_init(struct ahash_request *req)
> > +{
> > +     int x = 0, rc = 0;
> > +     struct crypto_ahash *reqtfm = crypto_ahash_reqtfm(req);
> > +     struct spacc_crypto_ctx *tctx = crypto_ahash_ctx(reqtfm);
> > +     struct spacc_crypto_reqctx *ctx = ahash_request_ctx(req);
> > +     const struct spacc_alg *salg = spacc_tfm_ahash(&reqtfm->base);
> > +     struct spacc_priv *priv = dev_get_drvdata(tctx->dev);
> > +
> > +
> > +     ctx->digest_buf = NULL;
> > +
> > +     ctx->single_shot = 0;
> > +     ctx->total_nents = 0;
> > +     ctx->cur_part_pck = 0;
> > +     ctx->final_part_pck = 0;
> > +     ctx->rem_len = 0;
> > +     ctx->rem_nents = 0;
> > +     ctx->first_ppp_chunk = 1;
> > +     ctx->small_pck = 1;
> > +     tctx->ppp_sgl = NULL;
> > +
> > +     if (tctx->handle < 0 || !tctx->ctx_valid) {
> > +             priv = NULL;
> > +             dev_dbg(tctx->dev, "%s: open SPAcc context\n", __func__);
> > +
> > +             for (x = 0; x < ELP_CAPI_MAX_DEV && salg->dev[x]; x++) {
> > +                     priv = dev_get_drvdata(salg->dev[x]);
> > +                     tctx->dev = get_device(salg->dev[x]);
> > +                     if (spacc_isenabled(&priv->spacc, salg->mode->id, 0)) {
> > +                             tctx->handle = spacc_open(&priv->spacc,
> > +                                                       CRYPTO_MODE_NULL,
> > +                                             salg->mode->id, -1, 0,
> > +                                             spacc_digest_cb, reqtfm);
> > +                     }
> > +
> > +                     if (tctx->handle >= 0)
> > +                             break;
> > +
> > +                     put_device(salg->dev[x]);
> > +             }
> > +
> > +             if (tctx->handle < 0) {
> > +                     dev_dbg(salg->dev[0], "Failed to open SPAcc context\n");
> > +                     goto fallback;
> > +             }
> > +
> > +             rc = spacc_set_operation(&priv->spacc, tctx->handle,
> > +                                      OP_ENCRYPT, ICV_HASH, IP_ICV_OFFSET,
> > +                                      0, 0, 0);
> > +             if (rc < 0) {
> > +                     spacc_close(&priv->spacc, tctx->handle);
> > +                     dev_dbg(salg->dev[0], "Failed to open SPAcc context\n");
> > +                     tctx->handle = -1;
> > +                     put_device(tctx->dev);
> > +                     goto fallback;
> > +             }
> > +             tctx->ctx_valid = true;
> > +     } else {
> > +             ;/* do nothing */
> > +     }
>
> Do we need this else?
>
> > +
> > +     /* alloc ppp_sgl */
> > +     tctx->ppp_sgl = kmalloc(sizeof(*(tctx->ppp_sgl)) * 2, GFP_KERNEL);
> > +     if (!tctx->ppp_sgl)
> > +             return -ENOMEM;
> > +
> > +     sg_init_table(tctx->ppp_sgl, 2);
> > +
> > +     return 0;
> > +fallback:
> > +
> > +     ctx->fb.hash_req.base = req->base;
> > +     ahash_request_set_tfm(&ctx->fb.hash_req, tctx->fb.hash);
> > +
> > +     return crypto_ahash_init(&ctx->fb.hash_req);
> > +}
> > +
> > +static int spacc_hash_final_part_pck(struct ahash_request *req)
> > +{
> > +     struct crypto_ahash *reqtfm = crypto_ahash_reqtfm(req);
> > +     struct spacc_crypto_ctx *tctx = crypto_ahash_ctx(reqtfm);
> > +     struct spacc_crypto_reqctx *ctx = ahash_request_ctx(req);
> > +     struct spacc_priv *priv = dev_get_drvdata(tctx->dev);
> > +
> > +     int rc;
> > +
> > +     ctx->final_part_pck = 1;
> > +
> > +     /* In all the final calls the data is same as prev update and
> > +      * hence we can skip this init dma part and just enQ ddt
> > +      * No use in calling initdata, just process remaining bytes in ppp_sgl
> > +      * and be done with it.
> > +      */
> > +
> > +     rc = spacc_hash_init_dma(tctx->dev, req, 1);
> > +
> > +     if (rc < 0)
> > +             return -ENOMEM;
> > +
> > +     if (rc == 0) {
> > +             ;/* small packet */
> > +     }
>
> Please cleanup these do-nothing comment code paths throughout.
>
> > +
> > +     /* enqueue ddt for the remaining bytes of data, everything else
> > +      * would have been processed already, req->nbytes need not be
> > +      * processed
> > +      * Since this will hit only for small pkts, hence the condition
> > +      *  ctx->rem_len-req->nbytes for the small pkt len
> > +      */
> > +     if (ctx->rem_len)
> > +             rc = spacc_packet_enqueue_ddt(&priv->spacc,
> > +                             ctx->acb.new_handle, &ctx->src, &ctx->dst,
> > +                             tctx->ppp_sgl[0].length,
> > +                             0, tctx->ppp_sgl[0].length, 0, 0, 0);
> > +     else {
> > +             /* zero msg handling */
> > +             rc = spacc_packet_enqueue_ddt(&priv->spacc,
> > +                             ctx->acb.new_handle,
> > +                             &ctx->src, &ctx->dst, 0, 0, 0, 0, 0, 0);
> > +     }
> > +
> > +     if (rc < 0) {
> > +             spacc_hash_cleanup_dma(tctx->dev, req);
> > +             spacc_close(&priv->spacc, ctx->acb.new_handle);
> > +
> > +             if (rc != -EBUSY) {
> > +                     dev_err(tctx->dev, "ERR: Failed to enqueue job: %d\n", rc);
> > +                     return rc;
> > +             }
> > +
> > +             if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
> > +                     return -EBUSY;
> > +     }
> > +
> > +     return -EINPROGRESS;
> > +}
> > +
>
> <snip>
>
> Thanks,
> Easwar