tls: rx: pull most of zc check out of the loop

Most of the conditions deciding if zero-copy can be used
do not change throughout the iterations, so pre-calculate
them.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 183e5ec..5ad0b25 100644 (file)
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -1763,6 +1763,7 @@ int tls_sw_recvmsg(struct sock *sk,
        bool is_kvec = iov_iter_is_kvec(&msg->msg_iter);
        bool is_peek = flags & MSG_PEEK;
        bool bpf_strp_enabled;
+       bool zc_capable;
 
        flags |= nonblock;
 
@@ -1788,6 +1789,8 @@ int tls_sw_recvmsg(struct sock *sk,
        len = len - copied;
        timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
 
+       zc_capable = !bpf_strp_enabled && !is_kvec && !is_peek &&
+                    prot->version != TLS_1_3_VERSION;
        decrypted = 0;
        while (len && (decrypted + copied < target || ctx->recv_pkt)) {
                struct tls_decrypt_arg darg = {};
@@ -1814,10 +1817,8 @@ int tls_sw_recvmsg(struct sock *sk,
 
                to_decrypt = rxm->full_len - prot->overhead_size;
 
-               if (to_decrypt <= len && !is_kvec && !is_peek &&
-                   tlm->control == TLS_RECORD_TYPE_DATA &&
-                   prot->version != TLS_1_3_VERSION &&
-                   !bpf_strp_enabled)
+               if (zc_capable && to_decrypt <= len &&
+                   tlm->control == TLS_RECORD_TYPE_DATA)
                        darg.zc = true;
 
                /* Do not use async mode if record is non-data */