netdev - [PATCH net-next V2 02/11] net: Add skb_can

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Message-ID: <1747950086-1246773-3-git-send-email-tariqt@nvidia.com>
Date: Fri, 23 May 2025 00:41:17 +0300
From: Tariq Toukan <tariqt@...dia.com>
To: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>, "Andrew
 Lunn" <andrew+netdev@...n.ch>
CC: Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>,
	Tariq Toukan <tariqt@...dia.com>, Richard Cochran <richardcochran@...il.com>,
	Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>, John Fastabend
	<john.fastabend@...il.com>, <netdev@...r.kernel.org>,
	<linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<bpf@...r.kernel.org>, Moshe Shemesh <moshe@...dia.com>, Mark Bloch
	<mbloch@...dia.com>, Gal Pressman <gal@...dia.com>, Cosmin Ratiu
	<cratiu@...dia.com>, Dragos Tatulea <dtatulea@...dia.com>
Subject: [PATCH net-next V2 02/11] net: Add skb_can_coalesce for netmem

From: Dragos Tatulea <dtatulea@...dia.com>

Allow drivers that have moved over to netmem to do fragment coalescing.

Signed-off-by: Dragos Tatulea <dtatulea@...dia.com>
Signed-off-by: Cosmin Ratiu <cratiu@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
---
 include/linux/skbuff.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 5520524c93bf..e8e2860183b4 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3887,6 +3887,18 @@ static inline bool skb_can_coalesce(struct sk_buff *skb, int i,
 	return false;
 }
 
+static inline bool skb_can_coalesce_netmem(struct sk_buff *skb, int i,
+					   const netmem_ref netmem, int off)
+{
+	if (i) {
+		const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
+
+		return netmem == skb_frag_netmem(frag) &&
+		       off == skb_frag_off(frag) + skb_frag_size(frag);
+	}
+	return false;
+}
+
 static inline int __skb_linearize(struct sk_buff *skb)
 {
 	return __pskb_pull_tail(skb, skb->data_len) ? 0 : -ENOMEM;
-- 
2.31.1