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Message-ID: <20240824215130.2134153-1-max@kutsevol.com>
Date: Sat, 24 Aug 2024 14:50:23 -0700
From: Maksym Kutsevol <max@...sevol.com>
To: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Breno Leitao <leitao@...ian.org>,
Maksym Kutsevol <max@...sevol.com>
Cc: netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] netpoll: Make netpoll_send_udp return status instead of void
netpoll_send_udp can return if send was successful.
It will allow client code to be aware of the send status.
Possible return values are the result of __netpoll_send_skb (cast to int)
and -ENOMEM. This doesn't cover the case when TX was not successful
instantaneously and was scheduled for later, __netpoll__send_skb returns
success in that case.
Signed-off-by: Maksym Kutsevol <max@...sevol.com>
---
Used in the next patch to expose send failure stats in netconsole
include/linux/netpoll.h | 2 +-
net/core/netpoll.c | 6 +++---
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/include/linux/netpoll.h b/include/linux/netpoll.h
index bd19c4b91e31..10ceef618e40 100644
--- a/include/linux/netpoll.h
+++ b/include/linux/netpoll.h
@@ -56,7 +56,7 @@ static inline void netpoll_poll_disable(struct net_device *dev) { return; }
static inline void netpoll_poll_enable(struct net_device *dev) { return; }
#endif
-void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
+int netpoll_send_udp(struct netpoll *np, const char *msg, int len);
void netpoll_print_options(struct netpoll *np);
int netpoll_parse_options(struct netpoll *np, char *opt);
int __netpoll_setup(struct netpoll *np, struct net_device *ndev);
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index d657b042d5a0..664343e3b688 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -395,7 +395,7 @@ netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
}
EXPORT_SYMBOL(netpoll_send_skb);
-void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
+int netpoll_send_udp(struct netpoll *np, const char *msg, int len)
{
int total_len, ip_len, udp_len;
struct sk_buff *skb;
@@ -419,7 +419,7 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
skb = find_skb(np, total_len + np->dev->needed_tailroom,
total_len - len);
if (!skb)
- return;
+ return -ENOMEM;
skb_copy_to_linear_data(skb, msg, len);
skb_put(skb, len);
@@ -495,7 +495,7 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
skb->dev = np->dev;
- netpoll_send_skb(np, skb);
+ return (int)netpoll_send_skb(np, skb);
}
EXPORT_SYMBOL(netpoll_send_udp);
base-commit: 8af174ea863c72f25ce31cee3baad8a301c0cf0f
--
2.43.5
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