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>

3 files changed, 35 insertions, 28 deletions

diff --git a/include/net/tls.h b/include/net/tls.h
index 6dab6683e42f..c664e6dba0d1 100644
--- a/include/net/tls.h
+++ b/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 */
diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index 2df1ae8b77fa..ac88877dcade 100644
--- a/net/tls/tls_main.c
+++ b/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);
-
-#ifdef CONFIG_TLS_DEVICE
-        if (ctx->rx_conf == TLS_HW)
+        else 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);
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 91d21b048a9b..c2b5e0d2ba1a 100644
--- a/net/tls/tls_sw.c
+++ b/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: