net/tls: clean up the number of #ifdefs for CONFIG_TLS_DEVICE

TLS code has a number of #ifdefs which make the code a little
harder to follow. Recent fixes removed the ifdef around the
TLS_HW define, so we can switch to the often used pattern
of defining tls_device functions as empty static inlines
in the header when CONFIG_TLS_DEVICE=n.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/tls.h

@@ -366,13 +366,9 @@ ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos,
 			   struct pipe_inode_info *pipe,
 			   size_t len, unsigned int flags);
 
-int tls_set_device_offload(struct sock *sk, struct tls_context *ctx);
 int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
 int tls_device_sendpage(struct sock *sk, struct page *page,
 			int offset, size_t size, int flags);
-void tls_device_free_resources_tx(struct sock *sk);
-void tls_device_init(void);
-void tls_device_cleanup(void);
 int tls_tx_records(struct sock *sk, int flags);
 
 struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context,
@@ -649,7 +645,6 @@ int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
 		      unsigned char *record_type);
 void tls_register_device(struct tls_device *device);
 void tls_unregister_device(struct tls_device *device);
-int tls_device_decrypted(struct sock *sk, struct sk_buff *skb);
 int decrypt_skb(struct sock *sk, struct sk_buff *skb,
 		struct scatterlist *sgout);
 struct sk_buff *tls_encrypt_skb(struct sk_buff *skb);
@@ -662,9 +657,40 @@ int tls_sw_fallback_init(struct sock *sk,
 			 struct tls_offload_context_tx *offload_ctx,
 			 struct tls_crypto_info *crypto_info);
 
+#ifdef CONFIG_TLS_DEVICE
+void tls_device_init(void);
+void tls_device_cleanup(void);
+int tls_set_device_offload(struct sock *sk, struct tls_context *ctx);
+void tls_device_free_resources_tx(struct sock *sk);
 int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx);
-
 void tls_device_offload_cleanup_rx(struct sock *sk);
 void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq);
+int tls_device_decrypted(struct sock *sk, struct sk_buff *skb);
+#else
+static inline void tls_device_init(void) {}
+static inline void tls_device_cleanup(void) {}
 
+static inline int
+tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline void tls_device_free_resources_tx(struct sock *sk) {}
+
+static inline int
+tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline void tls_device_offload_cleanup_rx(struct sock *sk) {}
+static inline void
+tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq) {}
+
+static inline int tls_device_decrypted(struct sock *sk, struct sk_buff *skb)
+{
+	return 0;
+}
+#endif
 #endif /* _TLS_OFFLOAD_H */

net/tls/tls_main.c

@@ -286,19 +286,14 @@ static void tls_sk_proto_cleanup(struct sock *sk,
 		kfree(ctx->tx.rec_seq);
 		kfree(ctx->tx.iv);
 		tls_sw_release_resources_tx(sk);
-#ifdef CONFIG_TLS_DEVICE
 	} else if (ctx->tx_conf == TLS_HW) {
 		tls_device_free_resources_tx(sk);
-#endif
 	}
 
 	if (ctx->rx_conf == TLS_SW)
 		tls_sw_release_resources_rx(sk);
-
+	else if (ctx->rx_conf == TLS_HW)
-#ifdef CONFIG_TLS_DEVICE
-	if (ctx->rx_conf == TLS_HW)
 		tls_device_offload_cleanup_rx(sk);
-#endif
 }
 
 static void tls_sk_proto_close(struct sock *sk, long timeout)
@@ -537,26 +532,18 @@ static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 	}
 
 	if (tx) {
-#ifdef CONFIG_TLS_DEVICE
 		rc = tls_set_device_offload(sk, ctx);
 		conf = TLS_HW;
 		if (rc) {
-#else
-		{
-#endif
 			rc = tls_set_sw_offload(sk, ctx, 1);
 			if (rc)
 				goto err_crypto_info;
 			conf = TLS_SW;
 		}
 	} else {
-#ifdef CONFIG_TLS_DEVICE
 		rc = tls_set_device_offload_rx(sk, ctx);
 		conf = TLS_HW;
 		if (rc) {
-#else
-		{
-#endif
 			rc = tls_set_sw_offload(sk, ctx, 0);
 			if (rc)
 				goto err_crypto_info;
@@ -920,9 +907,7 @@ static int __init tls_register(void)
 	tls_sw_proto_ops = inet_stream_ops;
 	tls_sw_proto_ops.splice_read = tls_sw_splice_read;
 
-#ifdef CONFIG_TLS_DEVICE
 	tls_device_init();
-#endif
 	tcp_register_ulp(&tcp_tls_ulp_ops);
 
 	return 0;
@@ -931,9 +916,7 @@ static int __init tls_register(void)
 static void __exit tls_unregister(void)
 {
 	tcp_unregister_ulp(&tcp_tls_ulp_ops);
-#ifdef CONFIG_TLS_DEVICE
 	tls_device_cleanup();
-#endif
 }
 
 module_init(tls_register);

net/tls/tls_sw.c

@@ -1489,13 +1489,12 @@ static int decrypt_skb_update(struct sock *sk, struct sk_buff *skb,
 	int pad, err = 0;
 
 	if (!ctx->decrypted) {
-#ifdef CONFIG_TLS_DEVICE
 		if (tls_ctx->rx_conf == TLS_HW) {
 			err = tls_device_decrypted(sk, skb);
 			if (err < 0)
 				return err;
 		}
-#endif
+
 		/* Still not decrypted after tls_device */
 		if (!ctx->decrypted) {
 			err = decrypt_internal(sk, skb, dest, NULL, chunk, zc,
@@ -2014,10 +2013,9 @@ static int tls_read_size(struct strparser *strp, struct sk_buff *skb)
 		ret = -EINVAL;
 		goto read_failure;
 	}
-#ifdef CONFIG_TLS_DEVICE
+
 	tls_device_rx_resync_new_rec(strp->sk, data_len + TLS_HEADER_SIZE,
 				     TCP_SKB_CB(skb)->seq + rxm->offset);
-#endif
 	return data_len + TLS_HEADER_SIZE;
 
 read_failure: