The branch main has been updated by markj:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=8adcc757b82c9c80ad743a11292287cebdb6d6f9

commit 8adcc757b82c9c80ad743a11292287cebdb6d6f9
Author:     Mark Johnston <ma...@freebsd.org>
AuthorDate: 2021-01-20 02:32:33 +0000
Commit:     Mark Johnston <ma...@freebsd.org>
CommitDate: 2021-01-20 02:32:33 +0000

    opencrypto: Add comments describing the new crypto_session layout
    
    Requested by:   rpokala
---
 sys/opencrypto/crypto.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/opencrypto/crypto.c b/sys/opencrypto/crypto.c
index fc4169fb2365..0316eb35361a 100644
--- a/sys/opencrypto/crypto.c
+++ b/sys/opencrypto/crypto.c
@@ -136,6 +136,7 @@ struct crypto_session {
        struct cryptocap *cap;
        struct crypto_session_params csp;
        uint64_t id;
+       /* Driver softc follows. */
 };
 
 /*
@@ -942,6 +943,7 @@ crypto_newsession(crypto_session_t *cses,
        cap->cc_sessions++;
        CRYPTO_DRIVER_UNLOCK();
 
+       /* Allocate a single block for the generic session and driver softc. */
        res = malloc(sizeof(*res) + cap->cc_session_size, M_CRYPTO_DATA,
            M_WAITOK | M_ZERO);
        res->cap = cap;
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