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[S390] zcrypt: cope with cca restriction of cex3 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/s390/crypto/zcrypt_api.h
View File

@ -109,6 +109,7 @@ struct zcrypt_device {
int request_count; /* # current requests. */
struct ap_message reply; /* Per-device reply structure. */
int max_exp_bit_length;
};
struct zcrypt_device *zcrypt_device_alloc(size_t);

6
drivers/s390/crypto/zcrypt_cex2a.c
View File

@ -441,6 +441,7 @@ static int zcrypt_cex2a_probe(struct ap_device *ap_dev)
zdev->max_mod_size = CEX2A_MAX_MOD_SIZE;
zdev->short_crt = 1;
zdev->speed_rating = CEX2A_SPEED_RATING;
zdev->max_exp_bit_length = CEX2A_MAX_MOD_SIZE;
break;
case AP_DEVICE_TYPE_CEX3A:
zdev = zcrypt_device_alloc(CEX3A_MAX_RESPONSE_SIZE);
@ -450,8 +451,11 @@ static int zcrypt_cex2a_probe(struct ap_device *ap_dev)
zdev->type_string = "CEX3A";
zdev->min_mod_size = CEX2A_MIN_MOD_SIZE;
zdev->max_mod_size = CEX2A_MAX_MOD_SIZE;
if (ap_4096_commands_available(ap_dev->qid))
zdev->max_exp_bit_length = CEX2A_MAX_MOD_SIZE;
if (ap_4096_commands_available(ap_dev->qid)) {
zdev->max_mod_size = CEX3A_MAX_MOD_SIZE;
zdev->max_exp_bit_length = CEX3A_MAX_MOD_SIZE;
}
zdev->short_crt = 1;
zdev->speed_rating = CEX3A_SPEED_RATING;
break;

1
drivers/s390/crypto/zcrypt_pcica.c
View File

@ -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);

1
drivers/s390/crypto/zcrypt_pcicc.c
View File

@ -579,6 +579,7 @@ static int zcrypt_pcicc_probe(struct ap_device *ap_dev)
zdev->min_mod_size = PCICC_MIN_MOD_SIZE;
zdev->max_mod_size = PCICC_MAX_MOD_SIZE;
zdev->speed_rating = PCICC_SPEED_RATING;
zdev->max_exp_bit_length = PCICC_MAX_MOD_SIZE;
ap_dev->reply = &zdev->reply;
ap_dev->private = zdev;
rc = zcrypt_device_register(zdev);

13
drivers/s390/crypto/zcrypt_pcixcc.c
View File

@ -567,6 +567,15 @@ static int convert_response_ica(struct zcrypt_device *zdev,
case TYPE88_RSP_CODE:
return convert_error(zdev, reply);
case TYPE86_RSP_CODE:
if (msg->cprbx.ccp_rtcode &&
(msg->cprbx.ccp_rscode == 0x14f) &&
(outputdatalength > 256)) {
if (zdev->max_exp_bit_length <= 17) {
zdev->max_exp_bit_length = 17;
return -EAGAIN;
} else
return -EINVAL;
}
if (msg->hdr.reply_code)
return convert_error(zdev, reply);
if (msg->cprbx.cprb_ver_id == 0x02)
@ -1052,11 +1061,13 @@ static int zcrypt_pcixcc_probe(struct ap_device *ap_dev)
zdev->speed_rating = PCIXCC_MCL2_SPEED_RATING;
zdev->min_mod_size = PCIXCC_MIN_MOD_SIZE_OLD;
zdev->max_mod_size = PCIXCC_MAX_MOD_SIZE;
zdev->max_exp_bit_length = PCIXCC_MAX_MOD_SIZE;
} else {
zdev->type_string = "PCIXCC_MCL3";
zdev->speed_rating = PCIXCC_MCL3_SPEED_RATING;
zdev->min_mod_size = PCIXCC_MIN_MOD_SIZE;
zdev->max_mod_size = PCIXCC_MAX_MOD_SIZE;
zdev->max_exp_bit_length = PCIXCC_MAX_MOD_SIZE;
}
break;
case AP_DEVICE_TYPE_CEX2C:
@ -1065,6 +1076,7 @@ static int zcrypt_pcixcc_probe(struct ap_device *ap_dev)
zdev->speed_rating = CEX2C_SPEED_RATING;
zdev->min_mod_size = PCIXCC_MIN_MOD_SIZE;
zdev->max_mod_size = PCIXCC_MAX_MOD_SIZE;
zdev->max_exp_bit_length = PCIXCC_MAX_MOD_SIZE;
break;
case AP_DEVICE_TYPE_CEX3C:
zdev->user_space_type = ZCRYPT_CEX3C;
@ -1072,6 +1084,7 @@ static int zcrypt_pcixcc_probe(struct ap_device *ap_dev)
zdev->speed_rating = CEX3C_SPEED_RATING;
zdev->min_mod_size = CEX3C_MIN_MOD_SIZE;
zdev->max_mod_size = CEX3C_MAX_MOD_SIZE;
zdev->max_exp_bit_length = CEX3C_MAX_MOD_SIZE;
break;
default:
goto out_free;