On Tue, Oct 08, 2019 at 11:19:41PM +0300, Horia Geantă wrote:
commit 48f89d2a2920166c35b1c0b69917dbb0390ebec7 upstream.
IV transfer from ofifo to class2 (set up at [29][30]) is not guaranteed to be scheduled before the data transfer from ofifo to external memory (set up at [38]:
[29] 10FA0004 ld: ind-nfifo (len=4) imm [30] 81F00010 <nfifo_entry: ofifo->class2 type=msg len=16> [31] 14820004 ld: ccb2-datasz len=4 offs=0 imm [32] 00000010 data:0x00000010 [33] 8210010D operation: cls1-op aes cbc init-final enc [34] A8080B04 math: (seqin + math0)->vseqout len=4 [35] 28000010 seqfifold: skip len=16 [36] A8080A04 math: (seqin + math0)->vseqin len=4 [37] 2F1E0000 seqfifold: both msg1->2-last2-last1 len=vseqinsz [38] 69300000 seqfifostr: msg len=vseqoutsz [39] 5C20000C seqstr: ccb2 ctx len=12 offs=0
If ofifo -> external memory transfer happens first, DECO will hang (issuing a Watchdog Timeout error, if WDOG is enabled) waiting for data availability in ofifo for the ofifo -> c2 ififo transfer.
Make sure IV transfer happens first by waiting for all CAAM internal transfers to end before starting payload transfer.
New descriptor with jump command inserted at [37]:
[..] [36] A8080A04 math: (seqin + math0)->vseqin len=4 [37] A1000401 jump: jsl1 all-match[!nfifopend] offset=[01] local->[38] [38] 2F1E0000 seqfifold: both msg1->2-last2-last1 len=vseqinsz [39] 69300000 seqfifostr: msg len=vseqoutsz [40] 5C20000C seqstr: ccb2 ctx len=12 offs=0
[Note: the issue is present in the descriptor from the very beginning (cf. Fixes tag). However I've marked it v4.19+ since it's the oldest maintained kernel that the patch applies clean against.]
Cc: stable@vger.kernel.org # v4.19+ Fixes: 1acebad3d8db8 ("crypto: caam - faster aead implementation") Signed-off-by: Horia Geantă horia.geanta@nxp.com Signed-off-by: Herbert Xu herbert@gondor.apana.org.au [Horia: backport to v4.4, v4.9] Signed-off-by: Horia Geantă horia.geanta@nxp.com
Now queued up, thanks.
greg k-h