IPoIB: fix skb truesize underestimatiom

Or Gerlitz reported triggering of WARN_ON_ONCE(delta < len); in
skb_try_coalesce()
This warning tracks drivers that incorrectly set skb->truesize

IPoIB indeed allocates a full page to store a fragment, but only
accounts in skb->truesize the used part of the page (frame length)

This patch fixes skb truesize underestimation, and
also fixes a performance issue, because RX skbs have not enough tailroom
to allow IP and TCP stacks to pull their header in skb linear part
without an expensive call to pskb_expand_head()

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Or Gerlitz <ogerlitz@mellanox.com>
Cc: Erez Shitrit <erezsh@mellanox.com>
Cc: Shlomo Pongartz <shlomop@mellanox.com>
Cc: Roland Dreier <roland@purestorage.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
index 5c1bc99..f10221f 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
@@ -123,7 +123,7 @@ static void ipoib_ud_skb_put_frags(struct ipoib_dev_priv *priv,
 
                skb_frag_size_set(frag, size);
                skb->data_len += size;
-               skb->truesize += size;
+               skb->truesize += PAGE_SIZE;
        } else
                skb_put(skb, length);
 
@@ -156,14 +156,18 @@ static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id)
        struct ipoib_dev_priv *priv = netdev_priv(dev);
        struct sk_buff *skb;
        int buf_size;
+       int tailroom;
        u64 *mapping;
 
-       if (ipoib_ud_need_sg(priv->max_ib_mtu))
+       if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
                buf_size = IPOIB_UD_HEAD_SIZE;
-       else
+               tailroom = 128; /* reserve some tailroom for IP/TCP headers */
+       } else {
                buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
+               tailroom = 0;
+       }
 
-       skb = dev_alloc_skb(buf_size + 4);
+       skb = dev_alloc_skb(buf_size + tailroom + 4);
        if (unlikely(!skb))
                return NULL;