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FreeBSD: Improve crypto_dispatch() handling 

Handle crypto_dispatch() return values same as crp->crp_etype errors.
On FreeBSD 12 many drivers returned same errors both ways, and lack
of proper handling for the first ended up in assertion panic later.
It was changed in FreeBSD 13, but there is no reason to not be safe.

While there, skip waiting for completion, including locking and
wakeup() call, for sessions on synchronous crypto drivers, such as
typical aesni and software.

Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <mav@FreeBSD.org>
Sponsored-By: iXsystems, Inc.
Closes #13563
This commit is contained in:
Alexander Motin 2022-06-17 18:38:51 -04:00 committed by Brian Behlendorf
parent 916d9de158
commit 881249de6f
1 changed files with 30 additions and 13 deletions
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43
module/os/freebsd/zfs/crypto_os.c
View File

@ -151,6 +151,13 @@ freebsd_zfs_crypt_done(struct cryptop *crp)
return (0);
}
static int
freebsd_zfs_crypt_done_sync(struct cryptop *crp)
{
return (0);
}
void
freebsd_crypt_freesession(freebsd_crypt_session_t *sess)
{
@ -160,26 +167,36 @@ freebsd_crypt_freesession(freebsd_crypt_session_t *sess)
}
static int
zfs_crypto_dispatch(freebsd_crypt_session_t *session, struct cryptop *crp)
zfs_crypto_dispatch(freebsd_crypt_session_t *session, struct cryptop *crp)
{
int error;
crp->crp_opaque = session;
crp->crp_callback = freebsd_zfs_crypt_done;
for (;;) {
#if __FreeBSD_version < 1400004
boolean_t async = ((crypto_ses2caps(crp->crp_session) &
CRYPTOCAP_F_SYNC) == 0);
#else
boolean_t async = !CRYPTO_SESS_SYNC(crp->crp_session);
#endif
crp->crp_callback = async ? freebsd_zfs_crypt_done :
freebsd_zfs_crypt_done_sync;
error = crypto_dispatch(crp);
if (error)
break;
mtx_lock(&session->fs_lock);
while (session->fs_done == false)
msleep(crp, &session->fs_lock, 0,
"zfs_crypto", 0);
mtx_unlock(&session->fs_lock);
if (crp->crp_etype == ENOMEM) {
pause("zcrnomem", 1);
} else if (crp->crp_etype != EAGAIN) {
if (error == 0) {
if (async) {
mtx_lock(&session->fs_lock);
while (session->fs_done == false) {
msleep(crp, &session->fs_lock, 0,
"zfs_crypto", 0);
}
mtx_unlock(&session->fs_lock);
}
error = crp->crp_etype;
}
if (error == ENOMEM) {
pause("zcrnomem", 1);
} else if (error != EAGAIN) {
break;
}
crp->crp_etype = 0;