tls: Fix write space handling

TLS device cannot use the sw context. This patch returns the original
tls device write space handler and moves the sw/device specific portions
to the relevant files.

Also, we remove the write_space call for the tls_sw flow, because it
handles partial records in its delayed tx work handler.

Fixes: a42055e8d2c3 ("net/tls: Add support for async encryption of records for performance")
Signed-off-by: Boris Pismenny <borisp@mellanox.com>
Reviewed-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 36 insertions, 9 deletions

diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
index 3e5e8e021a87..4a1da837a733 100644
--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -546,6 +546,23 @@ static int tls_device_push_pending_record(struct sock *sk, int flags)
         return tls_push_data(sk, &msg_iter, 0, flags, TLS_RECORD_TYPE_DATA);
 }
 
+void tls_device_write_space(struct sock *sk, struct tls_context *ctx)
+{
+        int rc = 0;
+
+        if (!sk->sk_write_pending && tls_is_partially_sent_record(ctx)) {
+                gfp_t sk_allocation = sk->sk_allocation;
+
+                sk->sk_allocation = GFP_ATOMIC;
+                rc = tls_push_partial_record(sk, ctx,
+                                             MSG_DONTWAIT | MSG_NOSIGNAL);
+                sk->sk_allocation = sk_allocation;
+        }
+
+        if (!rc)
+                ctx->sk_write_space(sk);
+}
+
 void handle_device_resync(struct sock *sk, u32 seq, u64 rcd_sn)
 {
         struct tls_context *tls_ctx = tls_get_ctx(sk);
diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index 7e05af75536d..17e8667917aa 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -212,7 +212,6 @@ int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
 static void tls_write_space(struct sock *sk)
 {
         struct tls_context *ctx = tls_get_ctx(sk);
-        struct tls_sw_context_tx *tx_ctx = tls_sw_ctx_tx(ctx);
 
         /* If in_tcp_sendpages call lower protocol write space handler
          * to ensure we wake up any waiting operations there. For example
@@ -223,14 +222,12 @@ static void tls_write_space(struct sock *sk)
                 return;
         }
 
-        /* Schedule the transmission if tx list is ready */
-        if (is_tx_ready(tx_ctx) && !sk->sk_write_pending) {
-                /* Schedule the transmission */
-                if (!test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx->tx_bitmask))
-                        schedule_delayed_work(&tx_ctx->tx_work.work, 0);
-        }
-
-        ctx->sk_write_space(sk);
+#ifdef CONFIG_TLS_DEVICE
+        if (ctx->tx_conf == TLS_HW)
+                tls_device_write_space(sk, ctx);
+        else
+#endif
+                tls_sw_write_space(sk, ctx);
 }
 
 static void tls_ctx_free(struct tls_context *ctx)
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 1cc830582fa8..917caacd4d31 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -2126,6 +2126,19 @@ static void tx_work_handler(struct work_struct *work)
         release_sock(sk);
 }
 
+void tls_sw_write_space(struct sock *sk, struct tls_context *ctx)
+{
+        struct tls_sw_context_tx *tx_ctx = tls_sw_ctx_tx(ctx);
+
+        /* Schedule the transmission if tx list is ready */
+        if (is_tx_ready(tx_ctx) && !sk->sk_write_pending) {
+                /* Schedule the transmission */
+                if (!test_and_set_bit(BIT_TX_SCHEDULED,
+                                      &tx_ctx->tx_bitmask))
+                        schedule_delayed_work(&tx_ctx->tx_work.work, 0);
+        }
+}
+
 int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
 {
         struct tls_context *tls_ctx = tls_get_ctx(sk);