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Message-Id: <20230406094245.3633290-16-dhowells@redhat.com> Date: Thu, 6 Apr 2023 10:42:41 +0100 From: David Howells <dhowells@...hat.com> To: netdev@...r.kernel.org Cc: David Howells <dhowells@...hat.com>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Willem de Bruijn <willemdebruijn.kernel@...il.com>, Matthew Wilcox <willy@...radead.org>, Al Viro <viro@...iv.linux.org.uk>, Christoph Hellwig <hch@...radead.org>, Jens Axboe <axboe@...nel.dk>, Jeff Layton <jlayton@...nel.org>, Christian Brauner <brauner@...nel.org>, Chuck Lever III <chuck.lever@...cle.com>, Linus Torvalds <torvalds@...ux-foundation.org>, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, David Ahern <dsahern@...nel.org> Subject: [PATCH net-next v5 15/19] ip6, udp6: Support MSG_SPLICE_PAGES Make IP6/UDP6 sendmsg() support MSG_SPLICE_PAGES. This causes pages to be spliced from the source iterator if possible, copying the data if not. This allows ->sendpage() to be replaced by something that can handle multiple multipage folios in a single transaction. Signed-off-by: David Howells <dhowells@...hat.com> cc: Willem de Bruijn <willemdebruijn.kernel@...il.com> cc: David Ahern <dsahern@...nel.org> cc: "David S. Miller" <davem@...emloft.net> cc: Eric Dumazet <edumazet@...gle.com> cc: Jakub Kicinski <kuba@...nel.org> cc: Paolo Abeni <pabeni@...hat.com> cc: Jens Axboe <axboe@...nel.dk> cc: Matthew Wilcox <willy@...radead.org> cc: netdev@...r.kernel.org --- include/net/ip.h | 1 + net/ipv4/ip_output.c | 4 ++-- net/ipv6/ip6_output.c | 12 ++++++++++++ 3 files changed, 15 insertions(+), 2 deletions(-) diff --git a/include/net/ip.h b/include/net/ip.h index c3fffaa92d6e..dcbedeffab60 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -211,6 +211,7 @@ int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); int __ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl, __u8 tos); void ip_init(void); +int __ip_splice_pages(struct sock *sk, struct sk_buff *skb, void *from, int *pcopy); int ip_append_data(struct sock *sk, struct flowi4 *fl4, int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c index 48db7bf475df..5b66c28c2e41 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -960,8 +960,7 @@ csum_page(struct page *page, int offset, int copy) /* * Add (or copy) data pages for MSG_SPLICE_PAGES. */ -static int __ip_splice_pages(struct sock *sk, struct sk_buff *skb, - void *from, int *pcopy) +int __ip_splice_pages(struct sock *sk, struct sk_buff *skb, void *from, int *pcopy) { struct msghdr *msg = from; struct page *page = NULL, **pages = &page; @@ -1010,6 +1009,7 @@ static int __ip_splice_pages(struct sock *sk, struct sk_buff *skb, *pcopy = copy; return 0; } +EXPORT_SYMBOL_GPL(__ip_splice_pages); static int __ip_append_data(struct sock *sk, struct flowi4 *fl4, diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index 0b6140f0179d..82846d18cf22 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -1589,6 +1589,14 @@ static int __ip6_append_data(struct sock *sk, skb_zcopy_set(skb, uarg, &extra_uref); } } + } else if ((flags & MSG_SPLICE_PAGES) && length) { + if (inet_sk(sk)->hdrincl) + return -EPERM; + if (rt->dst.dev->features & NETIF_F_SG) + /* We need an empty buffer to attach stuff to */ + paged = true; + else + flags &= ~MSG_SPLICE_PAGES; } /* @@ -1778,6 +1786,10 @@ static int __ip6_append_data(struct sock *sk, err = -EFAULT; goto error; } + } else if (flags & MSG_SPLICE_PAGES) { + err = __ip_splice_pages(sk, skb, from, ©); + if (err < 0) + goto error; } else if (!zc) { int i = skb_shinfo(skb)->nr_frags;
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