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net: mana: Fix return type of mana_start_xmit()

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The ndo_start_xmit field in net_device_ops is expected to be of type
netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb, struct net_device *dev).

The mismatched return type breaks forward edge kCFI since the underlying
function definition does not match the function hook definition. A new
warning in clang will catch this at compile time:

  drivers/net/ethernet/microsoft/mana/mana_en.c:382:21: error: incompatible function pointer types initializing 'netdev_tx_t (*)(struct sk_buff *, struct net_device *)' (aka 'enum netdev_tx (*)(struct sk_buff *, struct net_device *)') with an expression of type 'int (struct sk_buff *, struct net_device *)' [-Werror,-Wincompatible-function-pointer-types-strict]
          .ndo_start_xmit         = mana_start_xmit,
                                    ^~~~~~~~~~~~~~~
  1 error generated.

The return type of mana_start_xmit should be changed from int to
netdev_tx_t.

Reported-by: Dan Carpenter <error27@gmail.com>
Link: https://github.com/ClangBuiltLinux/linux/issues/1703
Link: https://github.com/ClangBuiltLinux/linux/issues/1750
Signed-off-by: Nathan Huckleberry <nhuck@google.com>
Reviewed-by: Dexuan Cui <decui@microsoft.com>
[nathan: Rebase on net-next and resolve conflicts
         Add note about new clang warning]
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20221109002629.1446680-1-nathan@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Nathan Huckleberry 2022-11-08 17:26:30 -07:00 committed by Paolo Abeni
parent e081ecf084
commit 0c9ef08a4d
2 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/ethernet/microsoft/mana/mana.h
View File

@ -388,7 +388,7 @@ struct mana_port_context {
struct mana_ethtool_stats eth_stats;
};
int mana_start_xmit(struct sk_buff *skb, struct net_device *ndev);
netdev_tx_t mana_start_xmit(struct sk_buff *skb, struct net_device *ndev);
int mana_config_rss(struct mana_port_context *ac, enum TRI_STATE rx,
bool update_hash, bool update_tab);

2
drivers/net/ethernet/microsoft/mana/mana_en.c
View File

@ -128,7 +128,7 @@ static int mana_map_skb(struct sk_buff *skb, struct mana_port_context *apc,
return -ENOMEM;
}
int mana_start_xmit(struct sk_buff *skb, struct net_device *ndev)
netdev_tx_t mana_start_xmit(struct sk_buff *skb, struct net_device *ndev)
{
enum mana_tx_pkt_format pkt_fmt = MANA_SHORT_PKT_FMT;
struct mana_port_context *apc = netdev_priv(ndev);