netdev - [RFC PATCH v2 net-next 01/12] net: core: trivial netif_receive_skb

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Message-ID: <55a58487-584a-9b1e-33d3-08e00af35bd8@solarflare.com>
Date:   Tue, 26 Jun 2018 19:17:17 +0100
From:   Edward Cree <ecree@...arflare.com>
To:     <linux-net-drivers@...arflare.com>, <netdev@...r.kernel.org>
CC:     <davem@...emloft.net>
Subject: [RFC PATCH v2 net-next 01/12] net: core: trivial
 netif_receive_skb_list() entry point

Just calls netif_receive_skb() in a loop.

Signed-off-by: Edward Cree <ecree@...arflare.com>
---
 include/linux/netdevice.h |  1 +
 net/core/dev.c            | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 3ec9850c7936..105087369779 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -3364,6 +3364,7 @@ int netif_rx(struct sk_buff *skb);
 int netif_rx_ni(struct sk_buff *skb);
 int netif_receive_skb(struct sk_buff *skb);
 int netif_receive_skb_core(struct sk_buff *skb);
+void netif_receive_skb_list(struct sk_buff_head *list);
 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb);
 void napi_gro_flush(struct napi_struct *napi, bool flush_old);
 struct sk_buff *napi_get_frags(struct napi_struct *napi);
diff --git a/net/core/dev.c b/net/core/dev.c
index a5aa1c7444e6..473e24e31e38 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4792,6 +4792,26 @@ int netif_receive_skb(struct sk_buff *skb)
 }
 EXPORT_SYMBOL(netif_receive_skb);
 
+/**
+ *	netif_receive_skb_list - process many receive buffers from network
+ *	@list: list of skbs to process.  Must not be shareable (e.g. it may
+ *	be on the stack)
+ *
+ *	For now, just calls netif_receive_skb() in a loop, ignoring the
+ *	return value.
+ *
+ *	This function may only be called from softirq context and interrupts
+ *	should be enabled.
+ */
+void netif_receive_skb_list(struct sk_buff_head *list)
+{
+	struct sk_buff *skb;
+
+	while ((skb = __skb_dequeue(list)) != NULL)
+		netif_receive_skb(skb);
+}
+EXPORT_SYMBOL(netif_receive_skb_list);
+
 DEFINE_PER_CPU(struct work_struct, flush_works);
 
 /* Network device is going away, flush any packets still pending */