net: move zerocopy_sg_from_iovec() to net/core/datagram.c

[karo-tx-linux.git] / drivers / net / macvtap.c

diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index a98fb0ed6aef7b9be00c4ed21ecc1b79793f9459..182364abfa3567901b5b088664b5649163b7c4de 100644 (file)
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -536,86 +536,6 @@ static inline struct sk_buff *macvtap_alloc_skb(struct sock *sk, size_t prepad,
        return skb;
 }
 
-/* set skb frags from iovec, this can move to core network code for reuse */
-static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from,
-                                 int offset, size_t count)
-{
-       int len = iov_length(from, count) - offset;
-       int copy = skb_headlen(skb);
-       int size, offset1 = 0;
-       int i = 0;
-
-       /* Skip over from offset */
-       while (count && (offset >= from->iov_len)) {
-               offset -= from->iov_len;
-               ++from;
-               --count;
-       }
-
-       /* copy up to skb headlen */
-       while (count && (copy > 0)) {
-               size = min_t(unsigned int, copy, from->iov_len - offset);
-               if (copy_from_user(skb->data + offset1, from->iov_base + offset,
-                                  size))
-                       return -EFAULT;
-               if (copy > size) {
-                       ++from;
-                       --count;
-                       offset = 0;
-               } else
-                       offset += size;
-               copy -= size;
-               offset1 += size;
-       }
-
-       if (len == offset1)
-               return 0;
-
-       while (count--) {
-               struct page *page[MAX_SKB_FRAGS];
-               int num_pages;
-               unsigned long base;
-               unsigned long truesize;
-
-               len = from->iov_len - offset;
-               if (!len) {
-                       offset = 0;
-                       ++from;
-                       continue;
-               }
-               base = (unsigned long)from->iov_base + offset;
-               size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT;
-               if (i + size > MAX_SKB_FRAGS)
-                       return -EMSGSIZE;
-               num_pages = get_user_pages_fast(base, size, 0, &page[i]);
-               if (num_pages != size) {
-                       int j;
-
-                       for (j = 0; j < num_pages; j++)
-                               put_page(page[i + j]);
-                       return -EFAULT;
-               }
-               truesize = size * PAGE_SIZE;
-               skb->data_len += len;
-               skb->len += len;
-               skb->truesize += truesize;
-               atomic_add(truesize, &skb->sk->sk_wmem_alloc);
-               while (len) {
-                       int off = base & ~PAGE_MASK;
-                       int size = min_t(int, len, PAGE_SIZE - off);
-                       __skb_fill_page_desc(skb, i, page[i], off, size);
-                       skb_shinfo(skb)->nr_frags++;
-                       /* increase sk_wmem_alloc */
-                       base += size;
-                       len -= size;
-                       i++;
-               }
-               offset = 0;
-               ++from;
-       }
-       return 0;
-}
-
 /*
  * macvtap_skb_from_vnet_hdr and macvtap_skb_to_vnet_hdr should
  * be shared with the tun/tap driver.
@@ -698,29 +618,6 @@ static int macvtap_skb_to_vnet_hdr(const struct sk_buff *skb,
        return 0;
 }
 
-static unsigned long iov_pages(const struct iovec *iv, int offset,
-                              unsigned long nr_segs)
-{
-       unsigned long seg, base;
-       int pages = 0, len, size;
-
-       while (nr_segs && (offset >= iv->iov_len)) {
-               offset -= iv->iov_len;
-               ++iv;
-               --nr_segs;
-       }
-
-       for (seg = 0; seg < nr_segs; seg++) {
-               base = (unsigned long)iv[seg].iov_base + offset;
-               len = iv[seg].iov_len - offset;
-               size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT;
-               pages += size;
-               offset = 0;
-       }
-
-       return pages;
-}
-
 /* Get packet from user space buffer */
 static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m,
                                const struct iovec *iv, unsigned long total_len,