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[S390] zcrypt: cope with cca restriction of cex3

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The cca on the crypto adapter has a restriction in the size of the
exponent if a key with a modulus bigger than 2048 bit is used. Thus
in that case we have to avoid that the crypto device driver thinks
the adapter is defect and sets it offline. Therfore a new member for
the zcrypt_device struct called max_exp_bit_length is introduced. This
will be set the first time the cca returns the error code function
not implemented. If this is done with an adapter twice it will return
-EINVAL.

Signed-off-by: Felix Beck <felix.beck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Felix Beck
2011-01-05 12:47:47 +01:00
committed by Martin Schwidefsky
parent 2ade1fab02
commit c2567f8ffa
5 changed files with 21 additions and 1 deletions
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1
drivers/s390/crypto/zcrypt_pcica.c
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@@ -373,6 +373,7 @@ static int zcrypt_pcica_probe(struct ap_device *ap_dev)
zdev->min_mod_size = PCICA_MIN_MOD_SIZE;
zdev->max_mod_size = PCICA_MAX_MOD_SIZE;
zdev->speed_rating = PCICA_SPEED_RATING;
zdev->max_exp_bit_length = PCICA_MAX_MOD_SIZE;
ap_dev->reply = &zdev->reply;
ap_dev->private = zdev;
rc = zcrypt_device_register(zdev);