From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 include/net/gro_cells.h | 102 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 include/net/gro_cells.h

(limited to 'include/net/gro_cells.h')

diff --git a/include/net/gro_cells.h b/include/net/gro_cells.h
new file mode 100644
index 000000000..0f712c0bc
--- /dev/null
+++ b/include/net/gro_cells.h
@@ -0,0 +1,102 @@
+#ifndef _NET_GRO_CELLS_H
+#define _NET_GRO_CELLS_H
+
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/netdevice.h>
+
+struct gro_cell {
+	struct sk_buff_head	napi_skbs;
+	struct napi_struct	napi;
+};
+
+struct gro_cells {
+	struct gro_cell __percpu	*cells;
+};
+
+static inline void gro_cells_receive(struct gro_cells *gcells, struct sk_buff *skb)
+{
+	struct gro_cell *cell;
+	struct net_device *dev = skb->dev;
+
+	if (!gcells->cells || skb_cloned(skb) || !(dev->features & NETIF_F_GRO)) {
+		netif_rx(skb);
+		return;
+	}
+
+	cell = this_cpu_ptr(gcells->cells);
+
+	if (skb_queue_len(&cell->napi_skbs) > netdev_max_backlog) {
+		atomic_long_inc(&dev->rx_dropped);
+		kfree_skb(skb);
+		return;
+	}
+
+	/* We run in BH context */
+	spin_lock(&cell->napi_skbs.lock);
+
+	__skb_queue_tail(&cell->napi_skbs, skb);
+	if (skb_queue_len(&cell->napi_skbs) == 1)
+		napi_schedule(&cell->napi);
+
+	spin_unlock(&cell->napi_skbs.lock);
+}
+
+/* called unser BH context */
+static inline int gro_cell_poll(struct napi_struct *napi, int budget)
+{
+	struct gro_cell *cell = container_of(napi, struct gro_cell, napi);
+	struct sk_buff *skb;
+	int work_done = 0;
+
+	spin_lock(&cell->napi_skbs.lock);
+	while (work_done < budget) {
+		skb = __skb_dequeue(&cell->napi_skbs);
+		if (!skb)
+			break;
+		spin_unlock(&cell->napi_skbs.lock);
+		napi_gro_receive(napi, skb);
+		work_done++;
+		spin_lock(&cell->napi_skbs.lock);
+	}
+
+	if (work_done < budget)
+		napi_complete(napi);
+	spin_unlock(&cell->napi_skbs.lock);
+	return work_done;
+}
+
+static inline int gro_cells_init(struct gro_cells *gcells, struct net_device *dev)
+{
+	int i;
+
+	gcells->cells = alloc_percpu(struct gro_cell);
+	if (!gcells->cells)
+		return -ENOMEM;
+
+	for_each_possible_cpu(i) {
+		struct gro_cell *cell = per_cpu_ptr(gcells->cells, i);
+
+		skb_queue_head_init(&cell->napi_skbs);
+		netif_napi_add(dev, &cell->napi, gro_cell_poll, 64);
+		napi_enable(&cell->napi);
+	}
+	return 0;
+}
+
+static inline void gro_cells_destroy(struct gro_cells *gcells)
+{
+	int i;
+
+	if (!gcells->cells)
+		return;
+	for_each_possible_cpu(i) {
+		struct gro_cell *cell = per_cpu_ptr(gcells->cells, i);
+		netif_napi_del(&cell->napi);
+		skb_queue_purge(&cell->napi_skbs);
+	}
+	free_percpu(gcells->cells);
+	gcells->cells = NULL;
+}
+
+#endif
-- 
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