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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Willem de Bruijn , David Ahern , Matthew Wilcox , Al Viro , Christoph Hellwig , Jens Axboe , Jeff Layton , Christian Brauner , Chuck Lever III , Linus Torvalds , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Kuniyuki Iwashima Subject: [PATCH net-next v6 18/18] af_unix: Support MSG_SPLICE_PAGES Date: Tue, 11 Apr 2023 17:09:02 +0100 Message-Id: <20230411160902.4134381-19-dhowells@redhat.com> In-Reply-To: <20230411160902.4134381-1-dhowells@redhat.com> References: <20230411160902.4134381-1-dhowells@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 X-Stat-Signature: rto3o9bmbzn1baihiykfwe4eskxmkfic X-Rspam-User: X-Rspamd-Queue-Id: 6D81C20014 X-Rspamd-Server: rspam06 X-HE-Tag: 1681229409-922795 X-HE-Meta: U2FsdGVkX194jRdZLVU48Qpn2GpdZhzPEZ2QINy5HQVynjbXbH27eY23yZyCBorZYvI5951xzdXKxtF1YZyJ/dLXSnamo1nRYijT7Etr3zYzwx+4wUyHbMGy8aLl+q1GAaBW+G8Xa0Jqcj9wyIOrzRnn0hxIVru/uQDmy4zP6nuFZRpgJZ6i374iXkLdWMseWr5uk5aD+L6Y7I0hzRaY1zf9gJPm/kwUg422kaVlVo72J/vm9lLRQLZTJJAPZXk572UUqQ+3loKJbsusno1q1htlbZbCkqELsLgXqhnbaKJolNEocifLBHzkF58tw5Q5vKJwgK2p6SLzWIEJVexz5b6NRIQiHGYkuFn8+W8Q3UiQ39wx8o3zkyRVImhpOV0sVy7gzFNmcbrs+fbciJoK2TwsU3KBAG7+Y2V000knL4ms1YDialRo+MW7AjvZSK/qxjRK3PYtptiZJl2DDQb4RG/gbq2LLmbITgrxqjNqMVFvlb22GQhSgG7UzZCLiYdSMhcgUNMuAxahlOZQFATQEKsR6TXtjK5bhAoLg46T2fz1c8uime0DTSIE1F9HTdrQ4ZiTAvUWu88E5ZDnYBPs8rmXprDbreVcsdNuDcTgZKDw6a+HLvXAxL847aZSNK+9Vc2ep1V65sOJXtWzYGzVg7kuBv9r5BF+76Xgj+5FPvUZuCDKxnL4Nf5pL1Kdzb5XQZTKMXJ4KVuQqZFVGRcwEbKt5EtbVoscyF5ihzrvidhCIbE+GvGLLp5dSc3BopWJuUXt6RkcGn7lQoMTU1DevPk8YVkMn36/r3l4awF2yeqrpezl7aAcMcokhUNdTke/wkr4tyKlxhpJUvy4MYSUNzCgtKB+hOXSnjCU8cPr31C2zQ2JYP+QhH374gzjaIZiY8AjnvEZCdzvsZkL2mArH0v8ypdBRNSl9udOm7RtbIkPGu2DXIV39GSm8zkDiPlZYrNVADurrAy2fVYUNGo K1OPA6oo 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Make AF_UNIX sendmsg() support MSG_SPLICE_PAGES, splicing in pages from the source iterator if possible and copying the data in otherwise. This allows ->sendpage() to be replaced by something that can handle multiple multipage folios in a single transaction. Signed-off-by: David Howells cc: "David S. Miller" cc: Eric Dumazet cc: Jakub Kicinski cc: Paolo Abeni cc: Kuniyuki Iwashima cc: Jens Axboe cc: Matthew Wilcox cc: netdev@vger.kernel.org --- Notes: ver #6) - Use common helper. net/unix/af_unix.c | 49 +++++++++++++++++++++++++++++++--------------- 1 file changed, 33 insertions(+), 16 deletions(-) diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index ea45dcc80232..e1f962180e55 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -2200,19 +2200,25 @@ static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg, while (sent < len) { size = len - sent; - /* Keep two messages in the pipe so it schedules better */ - size = min_t(int, size, (sk->sk_sndbuf >> 1) - 64); + if (unlikely(msg->msg_flags & MSG_SPLICE_PAGES)) { + skb = sock_alloc_send_pskb(sk, 0, 0, + msg->msg_flags & MSG_DONTWAIT, + &err, 0); + } else { + /* Keep two messages in the pipe so it schedules better */ + size = min_t(int, size, (sk->sk_sndbuf >> 1) - 64); - /* allow fallback to order-0 allocations */ - size = min_t(int, size, SKB_MAX_HEAD(0) + UNIX_SKB_FRAGS_SZ); + /* allow fallback to order-0 allocations */ + size = min_t(int, size, SKB_MAX_HEAD(0) + UNIX_SKB_FRAGS_SZ); - data_len = max_t(int, 0, size - SKB_MAX_HEAD(0)); + data_len = max_t(int, 0, size - SKB_MAX_HEAD(0)); - data_len = min_t(size_t, size, PAGE_ALIGN(data_len)); + data_len = min_t(size_t, size, PAGE_ALIGN(data_len)); - skb = sock_alloc_send_pskb(sk, size - data_len, data_len, - msg->msg_flags & MSG_DONTWAIT, &err, - get_order(UNIX_SKB_FRAGS_SZ)); + skb = sock_alloc_send_pskb(sk, size - data_len, data_len, + msg->msg_flags & MSG_DONTWAIT, &err, + get_order(UNIX_SKB_FRAGS_SZ)); + } if (!skb) goto out_err; @@ -2224,13 +2230,24 @@ static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg, } fds_sent = true; - skb_put(skb, size - data_len); - skb->data_len = data_len; - skb->len = size; - err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, size); - if (err) { - kfree_skb(skb); - goto out_err; + if (unlikely(msg->msg_flags & MSG_SPLICE_PAGES)) { + err = skb_splice_from_iter(skb, &msg->msg_iter, size, + sk->sk_allocation); + if (err < 0) { + kfree_skb(skb); + goto out_err; + } + size = err; + refcount_add(size, &sk->sk_wmem_alloc); + } else { + skb_put(skb, size - data_len); + skb->data_len = data_len; + skb->len = size; + err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, size); + if (err) { + kfree_skb(skb); + goto out_err; + } } unix_state_lock(other);