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tcp_metrics: fix tcp_metrics_nl_dump() return value

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Change tcp_metrics_nl_dump() to return 0 at the end
of a dump so that NLMSG_DONE can be appended
to the current skb, saving one recvmsg() system call.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20240416161112.1199265-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2024-04-16 16:11:12 +00:00 committed by Jakub Kicinski
parent 1514b06aff
commit ade1c9cc40
1 changed files with 4 additions and 2 deletions
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6
net/ipv4/tcp_metrics.c
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@ -766,6 +766,7 @@ static int tcp_metrics_nl_dump(struct sk_buff *skb,
unsigned int max_rows = 1U << tcp_metrics_hash_log;
unsigned int row, s_row = cb->args[0];
int s_col = cb->args[1], col = s_col;
int res = 0;
for (row = s_row; row < max_rows; row++, s_col = 0) {
struct tcp_metrics_block *tm;
@ -778,7 +779,8 @@ static int tcp_metrics_nl_dump(struct sk_buff *skb,
continue;
if (col < s_col)
continue;
if (tcp_metrics_dump_info(skb, cb, tm) < 0) {
res = tcp_metrics_dump_info(skb, cb, tm);
if (res < 0) {
rcu_read_unlock();
goto done;
}
@ -789,7 +791,7 @@ static int tcp_metrics_nl_dump(struct sk_buff *skb,
done:
cb->args[0] = row;
cb->args[1] = col;
return skb->len;
return res;
}
static int __parse_nl_addr(struct genl_info *info, struct inetpeer_addr *addr,