linux-kernel - [PATCH net-next v2 11/15] net: introduce the skb_copy_to_va

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Message-ID: <20240415131941.51153-12-linyunsheng@huawei.com>
Date: Mon, 15 Apr 2024 21:19:36 +0800
From: Yunsheng Lin <linyunsheng@...wei.com>
To: <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Yunsheng Lin
	<linyunsheng@...wei.com>, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next v2 11/15] net: introduce the skb_copy_to_va_nocache() helper

introduce the skb_copy_to_va_nocache() helper to avoid
calling virt_to_page() and skb_copy_to_page_nocache().

Signed-off-by: Yunsheng Lin <linyunsheng@...wei.com>
---
 include/net/sock.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/net/sock.h b/include/net/sock.h
index a495330c5c49..d214aeca72ad 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2272,6 +2272,21 @@ static inline int skb_copy_to_page_nocache(struct sock *sk, struct iov_iter *fro
 	return 0;
 }
 
+static inline int skb_copy_to_va_nocache(struct sock *sk, struct iov_iter *from,
+					 struct sk_buff *skb, char *va, int copy)
+{
+	int err;
+
+	err = skb_do_copy_data_nocache(sk, skb, from, va, copy, skb->len);
+	if (err)
+		return err;
+
+	skb_len_add(skb, copy);
+	sk_wmem_queued_add(sk, copy);
+	sk_mem_charge(sk, copy);
+	return 0;
+}
+
 /**
  * sk_wmem_alloc_get - returns write allocations
  * @sk: socket
-- 
2.33.0