diff options
| author |   Felix Beck <felix.beck@de.ibm.com> | 2011-01-05 12:47:47 +0100 |
|---|---|---|
| committer |   Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2011-01-05 12:47:27 +0100 |
| commit | c2567f8ffa2704f6f2f81013e9a590deca5a865f (patch) | |
| tree | 83c71b7139d21b51166f085f08bcefcaaa808b93 /drivers/s390/crypto/zcrypt_pcixcc.c | |
| parent | [S390] zcrypt: support for 4096 bit keys for cex3c (diff) | |
| download | linux-dev-c2567f8ffa2704f6f2f81013e9a590deca5a865f.tar.xz linux-dev-c2567f8ffa2704f6f2f81013e9a590deca5a865f.zip | |
[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>
Diffstat (limited to 'drivers/s390/crypto/zcrypt_pcixcc.c')
| -rw-r--r-- | drivers/s390/crypto/zcrypt_pcixcc.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/s390/crypto/zcrypt_pcixcc.c b/drivers/s390/crypto/zcrypt_pcixcc.c index fc8eb9dce841..4f85eb725f4f 100644 --- a/drivers/s390/crypto/zcrypt_pcixcc.c +++ b/drivers/s390/crypto/zcrypt_pcixcc.c @@ -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; |