ef100_enqueue_skb() generates a valid warning with gcc-13:
  drivers/net/ethernet/sfc/ef100_tx.c:370:5: error: conflicting types for 'ef100_enqueue_skb' due to enum/integer mismatch; have 'int(struct efx_tx_queue *, struct sk_buff *)'
  drivers/net/ethernet/sfc/ef100_tx.h:25:13: note: previous declaration of 'ef100_enqueue_skb' with type 'netdev_tx_t(struct efx_tx_queue *, struct sk_buff *)'

I.e. the type of the ef100_enqueue_skb()'s return value in the declaration is
int, while the definition spells enum netdev_tx_t. Synchronize them to the
latter.

Cc: Martin Liska <mliska@suse.cz>
Cc: Edward Cree <ecree.xilinx@gmail.com>
Cc: Martin Habets <habetsm.xilinx@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: netdev@vger.kernel.org
Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
---
 drivers/net/ethernet/sfc/ef100_tx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/sfc/ef100_tx.c b/drivers/net/ethernet/sfc/ef100_tx.c
index 102ddc7e206a..29ffaf35559d 100644
--- a/drivers/net/ethernet/sfc/ef100_tx.c
+++ b/drivers/net/ethernet/sfc/ef100_tx.c
@@ -367,7 +367,8 @@ void ef100_ev_tx(struct efx_channel *channel, const efx_qword_t *p_event)
  * Returns 0 on success, error code otherwise. In case of an error this
  * function will free the SKB.
  */
-int ef100_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
+netdev_tx_t ef100_enqueue_skb(struct efx_tx_queue *tx_queue,
+			      struct sk_buff *skb)
 {
 	return __ef100_enqueue_skb(tx_queue, skb, NULL);
 }
-- 
2.38.1

Hello:

This patch was applied to netdev/net-next.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Mon, 31 Oct 2022 12:44:40 +0100 you wrote:
> ef100_enqueue_skb() generates a valid warning with gcc-13:
>   drivers/net/ethernet/sfc/ef100_tx.c:370:5: error: conflicting types for 'ef100_enqueue_skb' due to enum/integer mismatch; have 'int(struct efx_tx_queue *, struct sk_buff *)'
>   drivers/net/ethernet/sfc/ef100_tx.h:25:13: note: previous declaration of 'ef100_enqueue_skb' with type 'netdev_tx_t(struct efx_tx_queue *, struct sk_buff *)'
> 
> I.e. the type of the ef100_enqueue_skb()'s return value in the declaration is
> int, while the definition spells enum netdev_tx_t. Synchronize them to the
> latter.
> 
> [...]

Here is the summary with links:
  - sfc (gcc13): synchronize ef100_enqueue_skb()'s return type
    https://git.kernel.org/netdev/net-next/c/3319dbb3e755

You are awesome, thank you!
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