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From 37ec026c96afe1091f91d40515a91463ea50c150 Mon Sep 17 00:00:00 2001
From: Nathan Huckleberry <nhuck@google.com>
Date: Tue, 8 Nov 2022 17:26:30 -0700
Subject: [PATCH 13/23] net: mana: Fix return type of mana_start_xmit()
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>
(cherry picked from commit 0c9ef08a4d0fd6c5e6000597b506235d71a85a61)
Signed-off-by: Bastian Blank <waldi@debian.org>
---
drivers/net/ethernet/microsoft/mana/mana_en.c | 2 +-
include/net/mana/mana.h | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index 9bce13714b25..2f6a048dee90 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -141,7 +141,7 @@ 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);
diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h
index 713a8f8cca9a..575ea36ce606 100644
--- a/include/net/mana/mana.h
+++ b/include/net/mana/mana.h
@@ -390,7 +390,7 @@ 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);
--
2.40.1
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