ip: Remove ip_append_page()

ip_append_page() is no longer used with the removal of udp_sendpage(), so
remove it.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
cc: David Ahern <dsahern@kernel.org>
cc: Jens Axboe <axboe@kernel.dk>
cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/include/net/ip.h b/include/net/ip.h
index c3fffaa..7627a4d 100644 (file)
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -220,8 +220,6 @@ int ip_append_data(struct sock *sk, struct flowi4 *fl4,
                   unsigned int flags);
 int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
                       struct sk_buff *skb);
-ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
-                      int offset, size_t size, int flags);
 struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
                              struct sk_buff_head *queue,
                              struct inet_cork *cork);

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index c7db973..553c740 100644 (file)
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -946,17 +946,6 @@ ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk
 }
 EXPORT_SYMBOL(ip_generic_getfrag);
 
-static inline __wsum
-csum_page(struct page *page, int offset, int copy)
-{
-       char *kaddr;
-       __wsum csum;
-       kaddr = kmap(page);
-       csum = csum_partial(kaddr + offset, copy, 0);
-       kunmap(page);
-       return csum;
-}
-
 static int __ip_append_data(struct sock *sk,
                            struct flowi4 *fl4,
                            struct sk_buff_head *queue,
@@ -1327,10 +1316,10 @@ static int ip_setup_cork(struct sock *sk, struct inet_cork *cork,
 }
 
 /*
- *     ip_append_data() and ip_append_page() can make one large IP datagram
- *     from many pieces of data. Each pieces will be holded on the socket
- *     until ip_push_pending_frames() is called. Each piece can be a page
- *     or non-page data.
+ *     ip_append_data() can make one large IP datagram from many pieces of
+ *     data.  Each piece will be held on the socket until
+ *     ip_push_pending_frames() is called. Each piece can be a page or
+ *     non-page data.
  *
  *     Not only UDP, other transport protocols - e.g. raw sockets - can use
  *     this interface potentially.
@@ -1363,135 +1352,6 @@ int ip_append_data(struct sock *sk, struct flowi4 *fl4,
                                from, length, transhdrlen, flags);
 }
 
-ssize_t        ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
-                      int offset, size_t size, int flags)
-{
-       struct inet_sock *inet = inet_sk(sk);
-       struct sk_buff *skb;
-       struct rtable *rt;
-       struct ip_options *opt = NULL;
-       struct inet_cork *cork;
-       int hh_len;
-       int mtu;
-       int len;
-       int err;
-       unsigned int maxfraglen, fragheaderlen, fraggap, maxnonfragsize;
-
-       if (inet->hdrincl)
-               return -EPERM;
-
-       if (flags&MSG_PROBE)
-               return 0;
-
-       if (skb_queue_empty(&sk->sk_write_queue))
-               return -EINVAL;
-
-       cork = &inet->cork.base;
-       rt = (struct rtable *)cork->dst;
-       if (cork->flags & IPCORK_OPT)
-               opt = cork->opt;
-
-       if (!(rt->dst.dev->features & NETIF_F_SG))
-               return -EOPNOTSUPP;
-
-       hh_len = LL_RESERVED_SPACE(rt->dst.dev);
-       mtu = cork->gso_size ? IP_MAX_MTU : cork->fragsize;
-
-       fragheaderlen = sizeof(struct iphdr) + (opt ? opt->optlen : 0);
-       maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen;
-       maxnonfragsize = ip_sk_ignore_df(sk) ? 0xFFFF : mtu;
-
-       if (cork->length + size > maxnonfragsize - fragheaderlen) {
-               ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
-                              mtu - (opt ? opt->optlen : 0));
-               return -EMSGSIZE;
-       }
-
-       skb = skb_peek_tail(&sk->sk_write_queue);
-       if (!skb)
-               return -EINVAL;
-
-       cork->length += size;
-
-       while (size > 0) {
-               /* Check if the remaining data fits into current packet. */
-               len = mtu - skb->len;
-               if (len < size)
-                       len = maxfraglen - skb->len;
-
-               if (len <= 0) {
-                       struct sk_buff *skb_prev;
-                       int alloclen;
-
-                       skb_prev = skb;
-                       fraggap = skb_prev->len - maxfraglen;
-
-                       alloclen = fragheaderlen + hh_len + fraggap + 15;
-                       skb = sock_wmalloc(sk, alloclen, 1, sk->sk_allocation);
-                       if (unlikely(!skb)) {
-                               err = -ENOBUFS;
-                               goto error;
-                       }
-
-                       /*
-                        *      Fill in the control structures
-                        */
-                       skb->ip_summed = CHECKSUM_NONE;
-                       skb->csum = 0;
-                       skb_reserve(skb, hh_len);
-
-                       /*
-                        *      Find where to start putting bytes.
-                        */
-                       skb_put(skb, fragheaderlen + fraggap);
-                       skb_reset_network_header(skb);
-                       skb->transport_header = (skb->network_header +
-                                                fragheaderlen);
-                       if (fraggap) {
-                               skb->csum = skb_copy_and_csum_bits(skb_prev,
-                                                                  maxfraglen,
-                                                   skb_transport_header(skb),
-                                                                  fraggap);
-                               skb_prev->csum = csum_sub(skb_prev->csum,
-                                                         skb->csum);
-                               pskb_trim_unique(skb_prev, maxfraglen);
-                       }
-
-                       /*
-                        * Put the packet on the pending queue.
-                        */
-                       __skb_queue_tail(&sk->sk_write_queue, skb);
-                       continue;
-               }
-
-               if (len > size)
-                       len = size;
-
-               if (skb_append_pagefrags(skb, page, offset, len,
-                                        MAX_SKB_FRAGS)) {
-                       err = -EMSGSIZE;
-                       goto error;
-               }
-
-               if (skb->ip_summed == CHECKSUM_NONE) {
-                       __wsum csum;
-                       csum = csum_page(page, offset, len);
-                       skb->csum = csum_block_add(skb->csum, csum, skb->len);
-               }
-
-               skb_len_add(skb, len);
-               refcount_add(len, &sk->sk_wmem_alloc);
-               offset += len;
-               size -= len;
-       }
-       return 0;
-
-error:
-       cork->length -= size;
-       IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTDISCARDS);
-       return err;
-}
-
 static void ip_cork_release(struct inet_cork *cork)
 {
        cork->flags &= ~IPCORK_OPT;