netdev - [RFC PATCH v2 08/21] skbuff: add a zc

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Message-ID: <20200727224444.2987641-9-jonathan.lemon@gmail.com>
Date:   Mon, 27 Jul 2020 15:44:31 -0700
From:   Jonathan Lemon <jonathan.lemon@...il.com>
To:     <netdev@...r.kernel.org>
CC:     <kernel-team@...com>
Subject: [RFC PATCH v2 08/21] 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
RX 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 fa817a105517..006e10fcc7d9 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