linux-kernel - [RFC,net-next v2 6/8] net: ip: Support MSG

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Date:   Sun, 12 Jun 2022 01:57:55 -0700
From:   Joe Damato <jdamato@...tly.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Joe Damato <jdamato@...tly.com>
Subject: [RFC,net-next v2 6/8] net: ip: Support MSG_NTCOPY

Support nontemporal copies of IP data when applications set the
MSG_NTCOPY flag and checksumming is offloaded.

ip_generic_getfrag is used by UDP and raw sockets, so this change
effectively enables MSG_NTCOPY support for both.

Signed-off-by: Joe Damato <jdamato@...tly.com>
---
 net/ipv4/ip_output.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 00b4bf2..75c8627 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -933,6 +933,7 @@ ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk
 	struct msghdr *msg = from;
 
 	if (skb->ip_summed == CHECKSUM_PARTIAL) {
+		msg_set_iter_copy_type(msg);
 		if (!copy_from_iter_full(to, len, &msg->msg_iter))
 			return -EFAULT;
 	} else {
-- 
2.7.4