From: Nathan Chancellor <nathan@kernel.org>
To: "K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>
Cc: linux-hyperv@vger.kernel.org, netdev@vger.kernel.org,
Nick Desaulniers <ndesaulniers@google.com>,
Tom Rix <trix@redhat.com>, Kees Cook <keescook@chromium.org>,
Sami Tolvanen <samitolvanen@google.com>,
llvm@lists.linux.dev, linux-kernel@vger.kernel.org,
patches@lists.linux.dev, Nathan Huckleberry <nhuck@google.com>,
Dan Carpenter <error27@gmail.com>,
Nathan Chancellor <nathan@kernel.org>
Subject: [PATCH v3] net: mana: Fix return type of mana_start_xmit()
Date: Tue, 8 Nov 2022 17:26:30 -0700 [thread overview]
Message-ID: <20221109002629.1446680-1-nathan@kernel.org> (raw)
From: Nathan Huckleberry <nhuck@google.com>
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>
---
v3:
- Take over for Nathan, as he is busy with other matters.
- Rebase on net-next and resolve conflicts.
- Add a note about new clang warning that will catch this issue at
compile time.
v2: https://lore.kernel.org/20220929181411.61331-1-nhuck@google.com/
drivers/net/ethernet/microsoft/mana/mana.h | 2 +-
drivers/net/ethernet/microsoft/mana/mana_en.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/microsoft/mana/mana.h b/drivers/net/ethernet/microsoft/mana/mana.h
index d58be64374c8..ffcd27cde17b 100644
--- a/drivers/net/ethernet/microsoft/mana/mana.h
+++ b/drivers/net/ethernet/microsoft/mana/mana.h
@@ -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);
diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index 318dbbb48279..91a8d3577c14 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -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);
base-commit: 8e18be7610aebea50e9327c11afcd5eeaaa06644
--
2.38.1
next reply other threads:[~2022-11-09 0:28 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-09 0:26 Nathan Chancellor [this message]
2022-11-10 11:40 ` [PATCH v3] net: mana: Fix return type of mana_start_xmit() patchwork-bot+netdevbpf
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