netdev - [PATCH] net, skbuff: Handle devmap managed page when skb->head

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Date:   Sun, 7 Jul 2019 01:27:54 +0530
From:   Ujjal Roy <royujjal@...il.com>
To:     Kernel <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH] net, skbuff: Handle devmap managed page when skb->head_frag
 is true

When head_frag is true we have page in the SKB head. So, for devm
managed page we need to inform the device driver through callback.

Signed-off-by: Ujjal Roy <royujjal@...il.com>
---
 net/core/skbuff.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index c8cd99c3603f..0d303e694efa 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -582,10 +582,16 @@ static void skb_free_head(struct sk_buff *skb)
{
unsigned char *head = skb->head;

- if (skb->head_frag)
+ if (skb->head_frag) {
+ struct page *page = virt_to_head_page(head);
+
+ if (put_devmap_managed_page(page))
+ return;
+
  skb_free_frag(head);
- else
+ } else {
  kfree(head);
+ }
 }

 static void skb_release_data(struct sk_buff *skb)
-- 
2.11.0