tls: Rename TLS_INFO_ZC_SENDFILE to TLS_INFO_ZC_TX

To embrace possible future optimizations of TLS, rename zerocopy
sendfile definitions to more generic ones:

* setsockopt: TLS_TX_ZEROCOPY_SENDFILE- > TLS_TX_ZEROCOPY_RO
* sock_diag: TLS_INFO_ZC_SENDFILE -> TLS_INFO_ZC_RO_TX

RO stands for readonly and emphasizes that the application shouldn't
modify the data being transmitted with zerocopy to avoid potential
disconnection.

Fixes: c1318b39 ("tls: Add opt-in zerocopy mode of sendfile()")
Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Link: https://lore.kernel.org/r/20220608153425.3151146-1-maximmi@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

include/uapi/linux/tls.h

@@ -39,7 +39,7 @@
 /* TLS socket options */
 #define TLS_TX			1	/* Set transmit parameters */
 #define TLS_RX			2	/* Set receive parameters */
-#define TLS_TX_ZEROCOPY_SENDFILE	3	/* transmit zerocopy sendfile */
+#define TLS_TX_ZEROCOPY_RO	3	/* TX zerocopy (only sendfile now) */
 
 /* Supported versions */
 #define TLS_VERSION_MINOR(ver)	((ver) & 0xFF)
@@ -161,7 +161,7 @@ enum {
 	TLS_INFO_CIPHER,
 	TLS_INFO_TXCONF,
 	TLS_INFO_RXCONF,
-	TLS_INFO_ZC_SENDFILE,
+	TLS_INFO_ZC_RO_TX,
 	__TLS_INFO_MAX,
 };
 #define TLS_INFO_MAX (__TLS_INFO_MAX - 1)

net/tls/tls_main.c

@@ -544,7 +544,7 @@ static int do_tls_getsockopt(struct sock *sk, int optname,
 		rc = do_tls_getsockopt_conf(sk, optval, optlen,
 					    optname == TLS_TX);
 		break;
-	case TLS_TX_ZEROCOPY_SENDFILE:
+	case TLS_TX_ZEROCOPY_RO:
 		rc = do_tls_getsockopt_tx_zc(sk, optval, optlen);
 		break;
 	default:
@@ -731,7 +731,7 @@ static int do_tls_setsockopt(struct sock *sk, int optname, sockptr_t optval,
 					    optname == TLS_TX);
 		release_sock(sk);
 		break;
-	case TLS_TX_ZEROCOPY_SENDFILE:
+	case TLS_TX_ZEROCOPY_RO:
 		lock_sock(sk);
 		rc = do_tls_setsockopt_tx_zc(sk, optval, optlen);
 		release_sock(sk);
@@ -970,7 +970,7 @@ static int tls_get_info(const struct sock *sk, struct sk_buff *skb)
 		goto nla_failure;
 
 	if (ctx->tx_conf == TLS_HW && ctx->zerocopy_sendfile) {
-		err = nla_put_flag(skb, TLS_INFO_ZC_SENDFILE);
+		err = nla_put_flag(skb, TLS_INFO_ZC_RO_TX);
 		if (err)
 			goto nla_failure;
 	}
@@ -994,7 +994,7 @@ static size_t tls_get_info_size(const struct sock *sk)
 		nla_total_size(sizeof(u16)) +	/* TLS_INFO_CIPHER */
 		nla_total_size(sizeof(u16)) +	/* TLS_INFO_RXCONF */
 		nla_total_size(sizeof(u16)) +	/* TLS_INFO_TXCONF */
-		nla_total_size(0) +		/* TLS_INFO_ZC_SENDFILE */
+		nla_total_size(0) +		/* TLS_INFO_ZC_RO_TX */
 		0;
 
 	return size;