diff mbox series

[net-next,06/11] net/tls: don't clear TX resync flag on error

Message ID 20190709025318.5534-7-jakub.kicinski@netronome.com
State Accepted
Delegated to: David Miller
Headers show
Series nfp: tls: fixes for initial TLS support | expand

Commit Message

Jakub Kicinski July 9, 2019, 2:53 a.m. UTC 
From: Dirk van der Merwe <dirk.vandermerwe@netronome.com>

Introduce a return code for the tls_dev_resync callback.

When the driver TX resync fails, kernel can retry the resync again
until it succeeds.  This prevents drivers from attempting to offload
TLS packets if the connection is known to be out of sync.

We don't worry about the RX resync since they will be retried naturally
as more encrypted records get received.

Signed-off-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
---
 .../net/ethernet/mellanox/mlx5/core/en_accel/tls.c  |  8 +++++---
 drivers/net/ethernet/netronome/nfp/crypto/tls.c     | 13 +++++++++----
 include/net/tls.h                                   |  6 +++---
 net/tls/tls_device.c                                |  8 ++++++--
 4 files changed, 23 insertions(+), 12 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/tls.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/tls.c
index f8b93b62a7d2..ca07c86427a7 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/tls.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/tls.c
@@ -160,9 +160,9 @@  static void mlx5e_tls_del(struct net_device *netdev,
 				direction == TLS_OFFLOAD_CTX_DIR_TX);
 }
 
-static void mlx5e_tls_resync(struct net_device *netdev, struct sock *sk,
-			     u32 seq, u8 *rcd_sn_data,
-			     enum tls_offload_ctx_dir direction)
+static int mlx5e_tls_resync(struct net_device *netdev, struct sock *sk,
+			    u32 seq, u8 *rcd_sn_data,
+			    enum tls_offload_ctx_dir direction)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
 	struct mlx5e_priv *priv = netdev_priv(netdev);
@@ -177,6 +177,8 @@  static void mlx5e_tls_resync(struct net_device *netdev, struct sock *sk,
 		    be64_to_cpu(rcd_sn));
 	mlx5_accel_tls_resync_rx(priv->mdev, rx_ctx->handle, seq, rcd_sn);
 	atomic64_inc(&priv->tls->sw_stats.rx_tls_resync_reply);
+
+	return 0;
 }
 
 static const struct tlsdev_ops mlx5e_tls_ops = {
diff --git a/drivers/net/ethernet/netronome/nfp/crypto/tls.c b/drivers/net/ethernet/netronome/nfp/crypto/tls.c
index b49405b4af55..d448c6de8ea4 100644
--- a/drivers/net/ethernet/netronome/nfp/crypto/tls.c
+++ b/drivers/net/ethernet/netronome/nfp/crypto/tls.c
@@ -403,7 +403,7 @@  nfp_net_tls_del(struct net_device *netdev, struct tls_context *tls_ctx,
 	nfp_net_tls_del_fw(nn, ntls->fw_handle);
 }
 
-static void
+static int
 nfp_net_tls_resync(struct net_device *netdev, struct sock *sk, u32 seq,
 		   u8 *rcd_sn, enum tls_offload_ctx_dir direction)
 {
@@ -412,11 +412,12 @@  nfp_net_tls_resync(struct net_device *netdev, struct sock *sk, u32 seq,
 	struct nfp_crypto_req_update *req;
 	struct sk_buff *skb;
 	gfp_t flags;
+	int err;
 
 	flags = direction == TLS_OFFLOAD_CTX_DIR_TX ? GFP_KERNEL : GFP_ATOMIC;
 	skb = nfp_net_tls_alloc_simple(nn, sizeof(*req), flags);
 	if (!skb)
-		return;
+		return -ENOMEM;
 
 	ntls = tls_driver_ctx(sk, direction);
 	req = (void *)skb->data;
@@ -428,13 +429,17 @@  nfp_net_tls_resync(struct net_device *netdev, struct sock *sk, u32 seq,
 	memcpy(req->rec_no, rcd_sn, sizeof(req->rec_no));
 
 	if (direction == TLS_OFFLOAD_CTX_DIR_TX) {
-		nfp_net_tls_communicate_simple(nn, skb, "sync",
-					       NFP_CCM_TYPE_CRYPTO_UPDATE);
+		err = nfp_net_tls_communicate_simple(nn, skb, "sync",
+						     NFP_CCM_TYPE_CRYPTO_UPDATE);
+		if (err)
+			return err;
 		ntls->next_seq = seq;
 	} else {
 		nfp_ccm_mbox_post(nn, skb, NFP_CCM_TYPE_CRYPTO_UPDATE,
 				  sizeof(struct nfp_crypto_reply_simple));
 	}
+
+	return 0;
 }
 
 static const struct tlsdev_ops nfp_net_tls_ops = {
diff --git a/include/net/tls.h b/include/net/tls.h
index 0279938386ab..0e4b9624361b 100644
--- a/include/net/tls.h
+++ b/include/net/tls.h
@@ -304,9 +304,9 @@  struct tlsdev_ops {
 	void (*tls_dev_del)(struct net_device *netdev,
 			    struct tls_context *ctx,
 			    enum tls_offload_ctx_dir direction);
-	void (*tls_dev_resync)(struct net_device *netdev,
-			       struct sock *sk, u32 seq, u8 *rcd_sn,
-			       enum tls_offload_ctx_dir direction);
+	int (*tls_dev_resync)(struct net_device *netdev,
+			      struct sock *sk, u32 seq, u8 *rcd_sn,
+			      enum tls_offload_ctx_dir direction);
 };
 
 enum tls_offload_sync_type {
diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
index 40076f423dcb..56135f3ff4ff 100644
--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -214,6 +214,7 @@  static void tls_device_resync_tx(struct sock *sk, struct tls_context *tls_ctx,
 {
 	struct net_device *netdev;
 	struct sk_buff *skb;
+	int err = 0;
 	u8 *rcd_sn;
 
 	skb = tcp_write_queue_tail(sk);
@@ -225,9 +226,12 @@  static void tls_device_resync_tx(struct sock *sk, struct tls_context *tls_ctx,
 	down_read(&device_offload_lock);
 	netdev = tls_ctx->netdev;
 	if (netdev)
-		netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, rcd_sn,
-						   TLS_OFFLOAD_CTX_DIR_TX);
+		err = netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq,
+							 rcd_sn,
+							 TLS_OFFLOAD_CTX_DIR_TX);
 	up_read(&device_offload_lock);
+	if (err)
+		return;
 
 	clear_bit_unlock(TLS_TX_SYNC_SCHED, &tls_ctx->flags);
 }