netdev - [RFC PATCH 11/21] skbuff: add a zc

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Message-ID: <20200618160941.879717-12-jonathan.lemon@gmail.com>
Date:   Thu, 18 Jun 2020 09:09:31 -0700
From:   Jonathan Lemon <jonathan.lemon@...il.com>
To:     <netdev@...r.kernel.org>
CC:     <kernel-team@...com>, <axboe@...nel.dk>
Subject: [RFC PATCH 11/21] skbuff: add a zc_netgpu bitflag

This could likely be moved elsewhere.  The presence of the flag on
the skb indicates that one of the fragments may contain zerocopy
data (where the data is not accessible to the cpu).

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

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 0c0377fc00c2..ba41d1a383f8 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -782,7 +782,8 @@ struct sk_buff {
 				fclone:2,
 				peeked:1,
 				head_frag:1,
-				pfmemalloc:1;
+				pfmemalloc:1,
+				zc_netgpu:1;
 #ifdef CONFIG_SKB_EXTENSIONS
 	__u8			active_extensions;
 #endif
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index b8afefe6f6b6..2a391042be53 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -992,6 +992,7 @@ static struct sk_buff *__skb_clone(struct sk_buff *n, struct sk_buff *skb)
 	n->cloned = 1;
 	n->nohdr = 0;
 	n->peeked = 0;
+	C(zc_netgpu);
 	C(pfmemalloc);
 	n->destructor = NULL;
 	C(tail);
-- 
2.24.1