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Prefer hardware crypto over software crypto.

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Before the change if a hardware crypto driver was loaded after
the software crypto driver, calling crypto_newsession() with
hard=0, will always choose software crypto.
This commit is contained in:
Pawel Jakub Dawidek 2006-06-04 22:12:08 +00:00
parent cb852b474a
commit 694e011306
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=159240
1 changed files with 77 additions and 41 deletions
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118
sys/opencrypto/crypto.c
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@ -262,8 +262,9 @@ MODULE_DEPEND(crypto, zlib, 1, 1, 1);
int
crypto_newsession(u_int64_t *sid, struct cryptoini *cri, int hard)
{
struct cryptocap *cap = NULL;
struct cryptoini *cr;
u_int32_t hid, lid;
u_int32_t hid = 0, lid;
int err = EINVAL;
CRYPTO_DRIVER_LOCK();
@ -279,50 +280,85 @@ crypto_newsession(u_int64_t *sid, struct cryptoini *cri, int hard)
* XXX another story altogether).
*/
for (hid = 0; hid < crypto_drivers_num; hid++) {
struct cryptocap *cap = &crypto_drivers[hid];
/*
* If it's not initialized or has remaining sessions
* referencing it, skip.
*/
if (cap->cc_newsession == NULL ||
(cap->cc_flags & CRYPTOCAP_F_CLEANUP))
continue;
/* Hardware required -- ignore software drivers. */
if (hard > 0 && (cap->cc_flags & CRYPTOCAP_F_SOFTWARE))
continue;
/* Software required -- ignore hardware drivers. */
if (hard < 0 && (cap->cc_flags & CRYPTOCAP_F_SOFTWARE) == 0)
continue;
/* See if all the algorithms are supported. */
for (cr = cri; cr; cr = cr->cri_next)
if (cap->cc_alg[cr->cri_alg] == 0)
break;
if (cr == NULL) {
/* Ok, all algorithms are supported. */
/*
* First try to find hardware crypto.
*/
if (hard >= 0) {
for (hid = 0; hid < crypto_drivers_num; hid++) {
cap = &crypto_drivers[hid];
/*
* Can't do everything in one session.
*
* XXX Fix this. We need to inject a "virtual" session layer right
* XXX about here.
* If it's not initialized or has remaining sessions
* referencing it, skip.
*/
if (cap->cc_newsession == NULL ||
(cap->cc_flags & CRYPTOCAP_F_CLEANUP))
continue;
/* Call the driver initialization routine. */
lid = hid; /* Pass the driver ID. */
err = (*cap->cc_newsession)(cap->cc_arg, &lid, cri);
if (err == 0) {
/* XXX assert (hid &~ 0xffffff) == 0 */
/* XXX assert (cap->cc_flags &~ 0xff) == 0 */
(*sid) = ((cap->cc_flags & 0xff) << 24) | hid;
(*sid) <<= 32;
(*sid) |= (lid & 0xffffffff);
cap->cc_sessions++;
/* Hardware required -- ignore software drivers. */
if (cap->cc_flags & CRYPTOCAP_F_SOFTWARE)
continue;
/* See if all the algorithms are supported. */
for (cr = cri; cr; cr = cr->cri_next)
if (cap->cc_alg[cr->cri_alg] == 0)
break;
if (cr == NULL) {
/* Ok, all algorithms are supported. */
break;
}
break;
}
if (hid == crypto_drivers_num)
cap = NULL;
}
/*
* If no hardware crypto, look for software crypto.
*/
if (cap == NULL && hard <= 0) {
for (hid = 0; hid < crypto_drivers_num; hid++) {
cap = &crypto_drivers[hid];
/*
* If it's not initialized or has remaining sessions
* referencing it, skip.
*/
if (cap->cc_newsession == NULL ||
(cap->cc_flags & CRYPTOCAP_F_CLEANUP))
continue;
/* Software required -- ignore hardware drivers. */
if (!(cap->cc_flags & CRYPTOCAP_F_SOFTWARE))
continue;
/* See if all the algorithms are supported. */
for (cr = cri; cr; cr = cr->cri_next)
if (cap->cc_alg[cr->cri_alg] == 0)
break;
if (cr == NULL) {
/* Ok, all algorithms are supported. */
break;
}
}
if (hid == crypto_drivers_num)
cap = NULL;
}
if (cap != NULL) {
/*
* Can't do everything in one session.
*
* XXX Fix this. We need to inject a "virtual" session layer right
* XXX about here.
*/
/* Call the driver initialization routine. */
lid = hid; /* Pass the driver ID. */
err = (*cap->cc_newsession)(cap->cc_arg, &lid, cri);
if (err == 0) {
/* XXX assert (hid &~ 0xffffff) == 0 */
/* XXX assert (cap->cc_flags &~ 0xff) == 0 */
(*sid) = ((cap->cc_flags & 0xff) << 24) | hid;
(*sid) <<= 32;
(*sid) |= (lid & 0xffffffff);
cap->cc_sessions++;
}
}
done: