3 files changed, 102 insertions, 72 deletions

diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
index d4548101e495..2486a656f12d 100644
--- a/drivers/net/bnx2.c
+++ b/drivers/net/bnx2.c
@@ -35,8 +35,8 @@
 #include <linux/time.h>
 #include <linux/ethtool.h>
 #include <linux/mii.h>
-#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
 #include <linux/if_vlan.h>
+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
 #define BCM_VLAN 1
 #endif
 #include <net/ip.h>
diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 49f6bc036a92..3b43bfd85a0f 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -64,68 +64,6 @@ struct pcpu_lstats {
         unsigned long bytes;
 };
 
-/* KISS: just allocate small chunks and copy bits.
- *
- * So, in fact, this is documentation, explaining what we expect
- * of largesending device modulo TCP checksum, which is ignored for loopback.
- */
-
-#ifdef LOOPBACK_TSO
-static void emulate_large_send_offload(struct sk_buff *skb)
-{
-        struct iphdr *iph = ip_hdr(skb);
-        struct tcphdr *th = (struct tcphdr *)(skb_network_header(skb) +
-                                              (iph->ihl * 4));
-        unsigned int doffset = (iph->ihl + th->doff) * 4;
-        unsigned int mtu = skb_shinfo(skb)->gso_size + doffset;
-        unsigned int offset = 0;
-        u32 seq = ntohl(th->seq);
-        u16 id  = ntohs(iph->id);
-
-        while (offset + doffset < skb->len) {
-                unsigned int frag_size = min(mtu, skb->len - offset) - doffset;
-                struct sk_buff *nskb = alloc_skb(mtu + 32, GFP_ATOMIC);
-
-                if (!nskb)
-                        break;
-                skb_reserve(nskb, 32);
-                skb_set_mac_header(nskb, -ETH_HLEN);
-                skb_reset_network_header(nskb);
-                iph = ip_hdr(nskb);
-                skb_copy_to_linear_data(nskb, skb_network_header(skb),
-                                        doffset);
-                if (skb_copy_bits(skb,
-                                  doffset + offset,
-                                  nskb->data + doffset,
-                                  frag_size))
-                        BUG();
-                skb_put(nskb, doffset + frag_size);
-                nskb->ip_summed = CHECKSUM_UNNECESSARY;
-                nskb->dev = skb->dev;
-                nskb->priority = skb->priority;
-                nskb->protocol = skb->protocol;
-                nskb->dst = dst_clone(skb->dst);
-                memcpy(nskb->cb, skb->cb, sizeof(skb->cb));
-                nskb->pkt_type = skb->pkt_type;
-
-                th = (struct tcphdr *)(skb_network_header(nskb) + iph->ihl * 4);
-                iph->tot_len = htons(frag_size + doffset);
-                iph->id = htons(id);
-                iph->check = 0;
-                iph->check = ip_fast_csum((unsigned char *) iph, iph->ihl);
-                th->seq = htonl(seq);
-                if (offset + doffset + frag_size < skb->len)
-                        th->fin = th->psh = 0;
-                netif_rx(nskb);
-                offset += frag_size;
-                seq += frag_size;
-                id++;
-        }
-
-        dev_kfree_skb(skb);
-}
-#endif /* LOOPBACK_TSO */
-
 /*
  * The higher levels take care of making this non-reentrant (it's
  * called with bh's disabled).
@@ -137,9 +75,6 @@ static int loopback_xmit(struct sk_buff *skb, struct net_device *dev)
         skb_orphan(skb);
 
         skb->protocol = eth_type_trans(skb,dev);
-#ifndef LOOPBACK_MUST_CHECKSUM
-        skb->ip_summed = CHECKSUM_UNNECESSARY;
-#endif
 
 #ifdef LOOPBACK_TSO
         if (skb_is_gso(skb)) {
@@ -234,9 +169,7 @@ static void loopback_setup(struct net_device *dev)
         dev->type               = ARPHRD_LOOPBACK;      /* 0x0001*/
         dev->flags              = IFF_LOOPBACK;
         dev->features           = NETIF_F_SG | NETIF_F_FRAGLIST
-#ifdef LOOPBACK_TSO
                 | NETIF_F_TSO
-#endif
                 | NETIF_F_NO_CSUM
                 | NETIF_F_HIGHDMA
                 | NETIF_F_LLTX
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index e6bbc639c2d0..6daea0c91862 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -358,6 +358,66 @@ static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
         return mask;
 }
 
+/* prepad is the amount to reserve at front.  len is length after that.
+ * linear is a hint as to how much to copy (usually headers). */
+static struct sk_buff *tun_alloc_skb(size_t prepad, size_t len, size_t linear,
+                                     gfp_t gfp)
+{
+        struct sk_buff *skb;
+        unsigned int i;
+
+        skb = alloc_skb(prepad + len, gfp|__GFP_NOWARN);
+        if (skb) {
+                skb_reserve(skb, prepad);
+                skb_put(skb, len);
+                return skb;
+        }
+
+        /* Under a page?  Don't bother with paged skb. */
+        if (prepad + len < PAGE_SIZE)
+                return NULL;
+
+        /* Start with a normal skb, and add pages. */
+        skb = alloc_skb(prepad + linear, gfp);
+        if (!skb)
+                return NULL;
+
+        skb_reserve(skb, prepad);
+        skb_put(skb, linear);
+
+        len -= linear;
+
+        for (i = 0; i < MAX_SKB_FRAGS; i++) {
+                skb_frag_t *f = &skb_shinfo(skb)->frags[i];
+
+                f->page = alloc_page(gfp|__GFP_ZERO);
+                if (!f->page)
+                        break;
+
+                f->page_offset = 0;
+                f->size = PAGE_SIZE;
+
+                skb->data_len += PAGE_SIZE;
+                skb->len += PAGE_SIZE;
+                skb->truesize += PAGE_SIZE;
+                skb_shinfo(skb)->nr_frags++;
+
+                if (len < PAGE_SIZE) {
+                        len = 0;
+                        break;
+                }
+                len -= PAGE_SIZE;
+        }
+
+        /* Too large, or alloc fail? */
+        if (unlikely(len)) {
+                kfree_skb(skb);
+                skb = NULL;
+        }
+
+        return skb;
+}
+
 /* Get packet from user space buffer */
 static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count)
 {
@@ -391,14 +451,12 @@ static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv,
                         return -EINVAL;
         }
 
-        if (!(skb = alloc_skb(len + align, GFP_KERNEL))) {
+        if (!(skb = tun_alloc_skb(align, len, gso.hdr_len, GFP_KERNEL))) {
                 tun->dev->stats.rx_dropped++;
                 return -ENOMEM;
         }
 
-        if (align)
-                skb_reserve(skb, align);
-        if (memcpy_fromiovec(skb_put(skb, len), iv, len)) {
+        if (skb_copy_datagram_from_iovec(skb, 0, iv, len)) {
                 tun->dev->stats.rx_dropped++;
                 kfree_skb(skb);
                 return -EFAULT;
@@ -748,6 +806,36 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
         return err;
 }
 
+static int tun_get_iff(struct net *net, struct file *file, struct ifreq *ifr)
+{
+        struct tun_struct *tun = file->private_data;
+
+        if (!tun)
+                return -EBADFD;
+
+        DBG(KERN_INFO "%s: tun_get_iff\n", tun->dev->name);
+
+        strcpy(ifr->ifr_name, tun->dev->name);
+
+        ifr->ifr_flags = 0;
+
+        if (ifr->ifr_flags & TUN_TUN_DEV)
+                ifr->ifr_flags |= IFF_TUN;
+        else
+                ifr->ifr_flags |= IFF_TAP;
+
+        if (tun->flags & TUN_NO_PI)
+                ifr->ifr_flags |= IFF_NO_PI;
+
+        if (tun->flags & TUN_ONE_QUEUE)
+                ifr->ifr_flags |= IFF_ONE_QUEUE;
+
+        if (tun->flags & TUN_VNET_HDR)
+                ifr->ifr_flags |= IFF_VNET_HDR;
+
+        return 0;
+}
+
 /* This is like a cut-down ethtool ops, except done via tun fd so no
  * privs required. */
 static int set_offload(struct net_device *dev, unsigned long arg)
@@ -833,6 +921,15 @@ static int tun_chr_ioctl(struct inode *inode, struct file *file,
         DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd);
 
         switch (cmd) {
+        case TUNGETIFF:
+                ret = tun_get_iff(current->nsproxy->net_ns, file, &ifr);
+                if (ret)
+                        return ret;
+
+                if (copy_to_user(argp, &ifr, sizeof(ifr)))
+                        return -EFAULT;
+                break;
+
         case TUNSETNOCSUM:
                 /* Disable/Enable checksum */
                 if (arg)