netdev - Re: [PATCH 08/22] crypto: chcr: Make use of the new sg

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Date:   Sat, 15 Apr 2017 10:23:33 +0530
From:   Harsh Jain <harshjain.prof@...il.com>
To:     Logan Gunthorpe <logang@...tatee.com>, harsh@...lsio.com
Cc:     Christoph Hellwig <hch@....de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sagi Grimberg <sagi@...mberg.me>, Jens Axboe <axboe@...nel.dk>,
        Tejun Heo <tj@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Ming Lin <ming.l@....samsung.com>,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org, intel-gfx@...ts.freedesktop.org,
        linux-raid@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-nvdimm@...ts.01.org,
        linux-scsi@...r.kernel.org, fcoe-devel@...n-fcoe.org,
        open-iscsi@...glegroups.com, megaraidlinux.pdl@...adcom.com,
        sparmaintainer@...sys.com, devel@...verdev.osuosl.org,
        target-devel@...r.kernel.org, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, rds-devel@....oracle.com,
        Steve Wise <swise@...ngridcomputing.com>,
        Stephen Bates <sbates@...thlin.com>
Subject: Re: [PATCH 08/22] crypto: chcr: Make use of the new sg_map helper function

On Fri, Apr 14, 2017 at 3:35 AM, Logan Gunthorpe <logang@...tatee.com> wrote:
> The get_page in this area looks *highly* suspect due to there being no
> corresponding put_page. However, I've left that as is to avoid breaking
> things.
chcr driver will post the request to LLD driver cxgb4 and put_page is
implemented there. it will no harm. Any how
we have removed the below code from driver.

http://www.mail-archive.com/linux-crypto@vger.kernel.org/msg24561.html

After this merge we can ignore your patch. Thanks

>
> I've also removed the KMAP_ATOMIC_ARGS check as it appears to be dead
> code that dates back to when it was first committed...


>
> Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
> ---
>  drivers/crypto/chelsio/chcr_algo.c | 28 +++++++++++++++-------------
>  1 file changed, 15 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/crypto/chelsio/chcr_algo.c b/drivers/crypto/chelsio/chcr_algo.c
> index 41bc7f4..a993d1d 100644
> --- a/drivers/crypto/chelsio/chcr_algo.c
> +++ b/drivers/crypto/chelsio/chcr_algo.c
> @@ -1489,22 +1489,21 @@ static struct sk_buff *create_authenc_wr(struct aead_request *req,
>         return ERR_PTR(-EINVAL);
>  }
>
> -static void aes_gcm_empty_pld_pad(struct scatterlist *sg,
> -                                 unsigned short offset)
> +static int aes_gcm_empty_pld_pad(struct scatterlist *sg,
> +                                unsigned short offset)
>  {
> -       struct page *spage;
>         unsigned char *addr;
>
> -       spage = sg_page(sg);
> -       get_page(spage); /* so that it is not freed by NIC */
> -#ifdef KMAP_ATOMIC_ARGS
> -       addr = kmap_atomic(spage, KM_SOFTIRQ0);
> -#else
> -       addr = kmap_atomic(spage);
> -#endif
> -       memset(addr + sg->offset, 0, offset + 1);
> +       get_page(sg_page(sg)); /* so that it is not freed by NIC */
> +
> +       addr = sg_map(sg, SG_KMAP_ATOMIC);
> +       if (IS_ERR(addr))
> +               return PTR_ERR(addr);
> +
> +       memset(addr, 0, offset + 1);
> +       sg_unmap(sg, addr, SG_KMAP_ATOMIC);
>
> -       kunmap_atomic(addr);
> +       return 0;
>  }
>
>  static int set_msg_len(u8 *block, unsigned int msglen, int csize)
> @@ -1940,7 +1939,10 @@ static struct sk_buff *create_gcm_wr(struct aead_request *req,
>         if (req->cryptlen) {
>                 write_sg_to_skb(skb, &frags, src, req->cryptlen);
>         } else {
> -               aes_gcm_empty_pld_pad(req->dst, authsize - 1);
> +               err = aes_gcm_empty_pld_pad(req->dst, authsize - 1);
> +               if (err)
> +                       goto dstmap_fail;
> +
>                 write_sg_to_skb(skb, &frags, reqctx->dst, crypt_len);
>
>         }
> --
> 2.1.4
>