macvtap: Use iovec iterators

This patch removes the use of skb_copy_datagram_const_iovec in
favour of the iovec iterator-based skb_copy_datagram_iter.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index 880cc090dc44ecb0167682e951bedff7753aef94..cea99d4a82630a958780d9dc5945552f0df27aa1 100644 (file)
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -15,6 +15,7 @@
 #include <linux/cdev.h>
 #include <linux/idr.h>
 #include <linux/fs.h>
+#include <linux/uio.h>
 
 #include <net/ipv6.h>
 #include <net/net_namespace.h>
@@ -778,31 +779,29 @@ static ssize_t macvtap_aio_write(struct kiocb *iocb, const struct iovec *iv,
 /* Put packet to the user space buffer */
 static ssize_t macvtap_put_user(struct macvtap_queue *q,
                                const struct sk_buff *skb,
-                               const struct iovec *iv, int len)
+                               struct iov_iter *iter)
 {
        int ret;
        int vnet_hdr_len = 0;
        int vlan_offset = 0;
-       int copied, total;
+       int total;
 
        if (q->flags & IFF_VNET_HDR) {
                struct virtio_net_hdr vnet_hdr;
                vnet_hdr_len = q->vnet_hdr_sz;
-               if ((len -= vnet_hdr_len) < 0)
+               if (iov_iter_count(iter) < vnet_hdr_len)
                        return -EINVAL;
 
                macvtap_skb_to_vnet_hdr(skb, &vnet_hdr);
 
-               if (memcpy_toiovecend(iv, (void *)&vnet_hdr, 0, sizeof(vnet_hdr)))
+               if (copy_to_iter(&vnet_hdr, sizeof(vnet_hdr), iter) !=
+                   sizeof(vnet_hdr))
                        return -EFAULT;
        }
-       total = copied = vnet_hdr_len;
+       total = vnet_hdr_len;
        total += skb->len;
 
-       if (!vlan_tx_tag_present(skb))
-               len = min_t(int, skb->len, len);
-       else {
-               int copy;
+       if (vlan_tx_tag_present(skb)) {
                struct {
                        __be16 h_vlan_proto;
                        __be16 h_vlan_TCI;
@@ -811,37 +810,33 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q,
                veth.h_vlan_TCI = htons(vlan_tx_tag_get(skb));
 
                vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto);
-               len = min_t(int, skb->len + VLAN_HLEN, len);
                total += VLAN_HLEN;
 
-               copy = min_t(int, vlan_offset, len);
-               ret = skb_copy_datagram_const_iovec(skb, 0, iv, copied, copy);
-               len -= copy;
-               copied += copy;
-               if (ret || !len)
+               ret = skb_copy_datagram_iter(skb, 0, iter, vlan_offset);
+               if (ret || !iov_iter_count(iter))
                        goto done;
 
-               copy = min_t(int, sizeof(veth), len);
-               ret = memcpy_toiovecend(iv, (void *)&veth, copied, copy);
-               len -= copy;
-               copied += copy;
-               if (ret || !len)
+               ret = copy_to_iter(&veth, sizeof(veth), iter);
+               if (ret != sizeof(veth) || !iov_iter_count(iter))
                        goto done;
        }
 
-       ret = skb_copy_datagram_const_iovec(skb, vlan_offset, iv, copied, len);
+       ret = skb_copy_datagram_iter(skb, vlan_offset, iter,
+                                    skb->len - vlan_offset);
 
 done:
        return ret ? ret : total;
 }
 
 static ssize_t macvtap_do_read(struct macvtap_queue *q,
-                              const struct iovec *iv, unsigned long len,
+                              const struct iovec *iv, unsigned long segs,
+                              unsigned long len,
                               int noblock)
 {
        DEFINE_WAIT(wait);
        struct sk_buff *skb;
        ssize_t ret = 0;
+       struct iov_iter iter;
 
        while (len) {
                if (!noblock)
@@ -863,7 +858,8 @@ static ssize_t macvtap_do_read(struct macvtap_queue *q,
                        schedule();
                        continue;
                }
-               ret = macvtap_put_user(q, skb, iv, len);
+               iov_iter_init(&iter, READ, iv, segs, len);
+               ret = macvtap_put_user(q, skb, &iter);
                kfree_skb(skb);
                break;
        }
@@ -886,7 +882,7 @@ static ssize_t macvtap_aio_read(struct kiocb *iocb, const struct iovec *iv,
                goto out;
        }
 
-       ret = macvtap_do_read(q, iv, len, file->f_flags & O_NONBLOCK);
+       ret = macvtap_do_read(q, iv, count, len, file->f_flags & O_NONBLOCK);
        ret = min_t(ssize_t, ret, len);
        if (ret > 0)
                iocb->ki_pos = ret;
@@ -1117,7 +1113,7 @@ static int macvtap_recvmsg(struct kiocb *iocb, struct socket *sock,
        int ret;
        if (flags & ~(MSG_DONTWAIT|MSG_TRUNC))
                return -EINVAL;
-       ret = macvtap_do_read(q, m->msg_iov, total_len,
+       ret = macvtap_do_read(q, m->msg_iov, m->msg_iovlen, total_len,
                          flags & MSG_DONTWAIT);
        if (ret > total_len) {
                m->msg_flags |= MSG_TRUNC;