linux-kernel - Re: [PATCHv4 6/8] crypto: add rocksoft 64b crc guard tag framework

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Message-ID: <20220308214612.GB3502158@dhcp-10-100-145-180.wdc.com>
Date:   Tue, 8 Mar 2022 13:46:12 -0800
From:   Keith Busch <kbusch@...nel.org>
To:     Vasily Gorbik <gor@...ux.ibm.com>
Cc:     linux-nvme@...ts.infradead.org, linux-block@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        axboe@...nel.dk, hch@....de, martin.petersen@...cle.com
Subject: Re: [PATCHv4 6/8] crypto: add rocksoft 64b crc guard tag framework

On Tue, Mar 08, 2022 at 12:27:47PM -0800, Keith Busch wrote:
> On Tue, Mar 08, 2022 at 09:21:41PM +0100, Vasily Gorbik wrote:
> > On Thu, Mar 03, 2022 at 12:13:10PM -0800, Keith Busch wrote:
> > > Hardware specific features may be able to calculate a crc64, so provide
> > > a framework for drivers to register their implementation. If nothing is
> > > registered, fallback to the generic table lookup implementation. The
> > > implementation is modeled after the crct10dif equivalent.
> > 
> > Hi Keith,
> > 
> > this is failing on big-endian systems. I get the following on s390:
> 
> Oh, I see the put_unaligned_le64() in chksum_final() was not the correct
> action. I'll send an update, thank you for the report.

I'll set up a BE qemu target this week, but in the meantime, would you
be able to confirm if the following is successful?

---
diff --git a/crypto/crc64_rocksoft_generic.c b/crypto/crc64_rocksoft_generic.c
index 9e812bb26dba..12a8b0575ad1 100644
--- a/crypto/crc64_rocksoft_generic.c
+++ b/crypto/crc64_rocksoft_generic.c
@@ -28,14 +28,14 @@ static int chksum_final(struct shash_desc *desc, u8 *out)
 {
 	u64 *crc = shash_desc_ctx(desc);
 
-	put_unaligned_le64(*crc, out);
+	put_unaligned(*crc, (u64 *)out);
 	return 0;
 }
 
 static int __chksum_finup(u64 crc, const u8 *data, unsigned int len, u8 *out)
 {
 	crc = crc64_rocksoft_generic(crc, data, len);
-	put_unaligned_le64(crc, out);
+	put_unaligned(crc, (u64 *)out);
 	return 0;
 }
 
--