[PATCH v7 03/23] net/tls: export get_netdev_for_sock

Aurelien Aptel
2022-10-25T14:00:39Z

From: Ben Ben-Ishay <benishay@nvidia.com>

get_netdev_for_sock is a utility that is used to obtain
the net_device structure from a connected socket.

Later patches will use this for nvme-tcp DDP and DDP DDGST offloads.

Signed-off-by: Ben Ben-Ishay <benishay@nvidia.com>
Signed-off-by: Shai Malin <smalin@nvidia.com>
Signed-off-by: Aurelien Aptel <aaptel@nvidia.com>
---
include/net/sock.h | 23 +++++++++++++++++++++++
net/tls/tls_device.c | 16 ----------------
2 files changed, 23 insertions(+), 16 deletions(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index 928bb601fd8f..7928680f4bbd 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2962,6 +2962,29 @@ int sock_get_timeout(long timeo, void *optval, bool old_timeval);
int sock_copy_user_timeval(struct __kernel_sock_timeval *tv,
sockptr_t optval, int optlen, bool old_timeval);

+/**
+ * get_netdev_for_sock() - get net_device from a connected socket.
+ * @sk: Connected socket.
+ *
+ * get_netdev_for_sock() is a utility that is used to obtain the net_device
+ * structure from a connected socket. This function assumes that the socket
+ * is already connected. This function is used by TLS and ULP DDP offloads.
+ */
+static inline struct net_device *get_netdev_for_sock(struct sock *sk)
+{
+ struct dst_entry *dst = sk_dst_get(sk);
+ struct net_device *netdev = NULL;
+
+ if (likely(dst)) {
+ netdev = netdev_sk_get_lowest_dev(dst->dev, sk);
+ dev_hold(netdev);
+ }
+
+ dst_release(dst);
+
+ return netdev;
+}
+
static inline bool sk_is_readable(struct sock *sk)
{
if (sk->sk_prot->sock_is_readable)
diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
index a03d66046ca3..1eb92dab4f34 100644
--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -120,22 +120,6 @@ static void tls_device_queue_ctx_destruction(struct tls_context *ctx)
tls_device_free_ctx(ctx);
}

-/* We assume that the socket is already connected */
-static struct net_device *get_netdev_for_sock(struct sock *sk)
-{
- struct dst_entry *dst = sk_dst_get(sk);
- struct net_device *netdev = NULL;
-
- if (likely(dst)) {
- netdev = netdev_sk_get_lowest_dev(dst->dev, sk);
- dev_hold(netdev);
- }
-
- dst_release(dst);
-
- return netdev;
-}
-
static void destroy_record(struct tls_record_info *record)
{
int i;
--
2.31.1