netdev - [PATCH 9/9 v1 RFC] skbuff: Call skb_zcopy_clear() before unref'ing fragments

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Message-ID: <20201218201633.2735367-10-jonathan.lemon@gmail.com>
Date:   Fri, 18 Dec 2020 12:16:33 -0800
From:   Jonathan Lemon <jonathan.lemon@...il.com>
To:     <netdev@...r.kernel.org>, <edumazet@...gle.com>,
        <willemdebruijn.kernel@...il.com>
CC:     <kernel-team@...com>
Subject: [PATCH 9/9 v1 RFC] skbuff: Call skb_zcopy_clear() before unref'ing fragments

From: Jonathan Lemon <bsd@...com>

RX zerocopy fragment pages which are not allocated from the
system page pool require special handling.  Give the callback
in skb_zcopy_clear() a chance to process them first.

Signed-off-by: Jonathan Lemon <jonathan.lemon@...il.com>
---
 net/core/skbuff.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 463078ba663f..ee75279c7c78 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -605,13 +605,14 @@ static void skb_release_data(struct sk_buff *skb)
 			      &shinfo->dataref))
 		return;
 
+	skb_zcopy_clear(skb, true);
+
 	for (i = 0; i < shinfo->nr_frags; i++)
 		__skb_frag_unref(&shinfo->frags[i]);
 
 	if (shinfo->frag_list)
 		kfree_skb_list(shinfo->frag_list);
 
-	skb_zcopy_clear(skb, true);
 	skb_free_head(skb);
 }
 
-- 
2.24.1