kernel: remove linux 4.0 support

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 47412

1 files changed, 0 insertions, 267 deletions

diff --git a/target/linux/generic/patches-4.0/072-03-bgmac-implement-scatter-gather-support.patch b/target/linux/generic/patches-4.0/072-03-bgmac-implement-scatter-gather-support.patch
deleted file mode 100644
index 5cb21a565a..0000000000
--- a/target/linux/generic/patches-4.0/072-03-bgmac-implement-scatter-gather-support.patch
+++ /dev/null
@@ -1,267 +0,0 @@
-From: Felix Fietkau <nbd@openwrt.org>
-Date: Mon, 23 Mar 2015 02:42:26 +0100
-Subject: [PATCH] bgmac: implement scatter/gather support
-
-Always use software checksumming, since the hardware does not have any
-checksum offload support.
-This significantly improves local TCP tx performance.
-
-Signed-off-by: Felix Fietkau <nbd@openwrt.org>
----
-
---- a/drivers/net/ethernet/broadcom/bgmac.c
-+++ b/drivers/net/ethernet/broadcom/bgmac.c
-@@ -115,53 +115,91 @@ static void bgmac_dma_tx_enable(struct b
- 	bgmac_write(bgmac, ring->mmio_base + BGMAC_DMA_TX_CTL, ctl);
- }
- 
-+static void
-+bgmac_dma_tx_add_buf(struct bgmac *bgmac, struct bgmac_dma_ring *ring,
-+		     int i, int len, u32 ctl0)
-+{
-+	struct bgmac_slot_info *slot;
-+	struct bgmac_dma_desc *dma_desc;
-+	u32 ctl1;
-+
-+	if (i == ring->num_slots - 1)
-+		ctl0 |= BGMAC_DESC_CTL0_EOT;
-+
-+	ctl1 = len & BGMAC_DESC_CTL1_LEN;
-+
-+	slot = &ring->slots[i];
-+	dma_desc = &ring->cpu_base[i];
-+	dma_desc->addr_low = cpu_to_le32(lower_32_bits(slot->dma_addr));
-+	dma_desc->addr_high = cpu_to_le32(upper_32_bits(slot->dma_addr));
-+	dma_desc->ctl0 = cpu_to_le32(ctl0);
-+	dma_desc->ctl1 = cpu_to_le32(ctl1);
-+}
-+
- static netdev_tx_t bgmac_dma_tx_add(struct bgmac *bgmac,
- 				    struct bgmac_dma_ring *ring,
- 				    struct sk_buff *skb)
- {
- 	struct device *dma_dev = bgmac->core->dma_dev;
- 	struct net_device *net_dev = bgmac->net_dev;
--	struct bgmac_dma_desc *dma_desc;
--	struct bgmac_slot_info *slot;
--	u32 ctl0, ctl1;
-+	struct bgmac_slot_info *slot = &ring->slots[ring->end];
- 	int free_slots;
-+	int nr_frags;
-+	u32 flags;
-+	int index = ring->end;
-+	int i;
- 
- 	if (skb->len > BGMAC_DESC_CTL1_LEN) {
- 		bgmac_err(bgmac, "Too long skb (%d)\n", skb->len);
--		goto err_stop_drop;
-+		goto err_drop;
- 	}
- 
-+	if (skb->ip_summed == CHECKSUM_PARTIAL)
-+		skb_checksum_help(skb);
-+
-+	nr_frags = skb_shinfo(skb)->nr_frags;
-+
- 	if (ring->start <= ring->end)
- 		free_slots = ring->start - ring->end + BGMAC_TX_RING_SLOTS;
- 	else
- 		free_slots = ring->start - ring->end;
--	if (free_slots == 1) {
-+
-+	if (free_slots <= nr_frags + 1) {
- 		bgmac_err(bgmac, "TX ring is full, queue should be stopped!\n");
- 		netif_stop_queue(net_dev);
- 		return NETDEV_TX_BUSY;
- 	}
- 
--	slot = &ring->slots[ring->end];
--	slot->skb = skb;
--	slot->dma_addr = dma_map_single(dma_dev, skb->data, skb->len,
-+	slot->dma_addr = dma_map_single(dma_dev, skb->data, skb_headlen(skb),
- 					DMA_TO_DEVICE);
--	if (dma_mapping_error(dma_dev, slot->dma_addr)) {
--		bgmac_err(bgmac, "Mapping error of skb on ring 0x%X\n",
--			  ring->mmio_base);
--		goto err_stop_drop;
--	}
-+	if (unlikely(dma_mapping_error(dma_dev, slot->dma_addr)))
-+		goto err_dma_head;
- 
--	ctl0 = BGMAC_DESC_CTL0_IOC | BGMAC_DESC_CTL0_SOF | BGMAC_DESC_CTL0_EOF;
--	if (ring->end == ring->num_slots - 1)
--		ctl0 |= BGMAC_DESC_CTL0_EOT;
--	ctl1 = skb->len & BGMAC_DESC_CTL1_LEN;
-+	flags = BGMAC_DESC_CTL0_SOF;
-+	if (!nr_frags)
-+		flags |= BGMAC_DESC_CTL0_EOF | BGMAC_DESC_CTL0_IOC;
-+
-+	bgmac_dma_tx_add_buf(bgmac, ring, index, skb_headlen(skb), flags);
-+	flags = 0;
-+
-+	for (i = 0; i < nr_frags; i++) {
-+		struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[i];
-+		int len = skb_frag_size(frag);
-+
-+		index = (index + 1) % BGMAC_TX_RING_SLOTS;
-+		slot = &ring->slots[index];
-+		slot->dma_addr = skb_frag_dma_map(dma_dev, frag, 0,
-+						  len, DMA_TO_DEVICE);
-+		if (unlikely(dma_mapping_error(dma_dev, slot->dma_addr)))
-+			goto err_dma;
- 
--	dma_desc = ring->cpu_base;
--	dma_desc += ring->end;
--	dma_desc->addr_low = cpu_to_le32(lower_32_bits(slot->dma_addr));
--	dma_desc->addr_high = cpu_to_le32(upper_32_bits(slot->dma_addr));
--	dma_desc->ctl0 = cpu_to_le32(ctl0);
--	dma_desc->ctl1 = cpu_to_le32(ctl1);
-+		if (i == nr_frags - 1)
-+			flags |= BGMAC_DESC_CTL0_EOF | BGMAC_DESC_CTL0_IOC;
-+
-+		bgmac_dma_tx_add_buf(bgmac, ring, index, len, flags);
-+	}
-+
-+	slot->skb = skb;
- 
- 	netdev_sent_queue(net_dev, skb->len);
- 
-@@ -170,20 +208,35 @@ static netdev_tx_t bgmac_dma_tx_add(stru
- 	/* Increase ring->end to point empty slot. We tell hardware the first
- 	 * slot it should *not* read.
- 	 */
--	if (++ring->end >= BGMAC_TX_RING_SLOTS)
--		ring->end = 0;
-+	ring->end = (index + 1) % BGMAC_TX_RING_SLOTS;
- 	bgmac_write(bgmac, ring->mmio_base + BGMAC_DMA_TX_INDEX,
- 		    ring->index_base +
- 		    ring->end * sizeof(struct bgmac_dma_desc));
- 
--	/* Always keep one slot free to allow detecting bugged calls. */
--	if (--free_slots == 1)
-+	free_slots -= nr_frags + 1;
-+	if (free_slots < 8)
- 		netif_stop_queue(net_dev);
- 
- 	return NETDEV_TX_OK;
- 
--err_stop_drop:
--	netif_stop_queue(net_dev);
-+err_dma:
-+	dma_unmap_single(dma_dev, slot->dma_addr, skb_headlen(skb),
-+			 DMA_TO_DEVICE);
-+
-+	while (i > 0) {
-+		int index = (ring->end + i) % BGMAC_TX_RING_SLOTS;
-+		struct bgmac_slot_info *slot = &ring->slots[index];
-+		u32 ctl1 = le32_to_cpu(ring->cpu_base[index].ctl1);
-+		int len = ctl1 & BGMAC_DESC_CTL1_LEN;
-+
-+		dma_unmap_page(dma_dev, slot->dma_addr, len, DMA_TO_DEVICE);
-+	}
-+
-+err_dma_head:
-+	bgmac_err(bgmac, "Mapping error of skb on ring 0x%X\n",
-+		  ring->mmio_base);
-+
-+err_drop:
- 	dev_kfree_skb(skb);
- 	return NETDEV_TX_OK;
- }
-@@ -205,32 +258,45 @@ static void bgmac_dma_tx_free(struct bgm
- 
- 	while (ring->start != empty_slot) {
- 		struct bgmac_slot_info *slot = &ring->slots[ring->start];
-+		u32 ctl1 = le32_to_cpu(ring->cpu_base[ring->start].ctl1);
-+		int len = ctl1 & BGMAC_DESC_CTL1_LEN;
- 
--		if (slot->skb) {
-+		if (!slot->dma_addr) {
-+			bgmac_err(bgmac, "Hardware reported transmission for empty TX ring slot %d! End of ring: %d\n",
-+				  ring->start, ring->end);
-+			goto next;
-+		}
-+
-+		if (ctl1 & BGMAC_DESC_CTL0_SOF)
- 			/* Unmap no longer used buffer */
--			dma_unmap_single(dma_dev, slot->dma_addr,
--					 slot->skb->len, DMA_TO_DEVICE);
--			slot->dma_addr = 0;
-+			dma_unmap_single(dma_dev, slot->dma_addr, len,
-+					 DMA_TO_DEVICE);
-+		else
-+			dma_unmap_page(dma_dev, slot->dma_addr, len,
-+				       DMA_TO_DEVICE);
- 
-+		if (slot->skb) {
- 			bytes_compl += slot->skb->len;
- 			pkts_compl++;
- 
- 			/* Free memory! :) */
- 			dev_kfree_skb(slot->skb);
- 			slot->skb = NULL;
--		} else {
--			bgmac_err(bgmac, "Hardware reported transmission for empty TX ring slot %d! End of ring: %d\n",
--				  ring->start, ring->end);
- 		}
- 
-+next:
-+		slot->dma_addr = 0;
- 		if (++ring->start >= BGMAC_TX_RING_SLOTS)
- 			ring->start = 0;
- 		freed = true;
- 	}
- 
-+	if (!pkts_compl)
-+		return;
-+
- 	netdev_completed_queue(bgmac->net_dev, pkts_compl, bytes_compl);
- 
--	if (freed && netif_queue_stopped(bgmac->net_dev))
-+	if (netif_queue_stopped(bgmac->net_dev))
- 		netif_wake_queue(bgmac->net_dev);
- }
- 
-@@ -439,17 +505,25 @@ static void bgmac_dma_tx_ring_free(struc
- 				   struct bgmac_dma_ring *ring)
- {
- 	struct device *dma_dev = bgmac->core->dma_dev;
-+	struct bgmac_dma_desc *dma_desc = ring->cpu_base;
- 	struct bgmac_slot_info *slot;
- 	int i;
- 
- 	for (i = 0; i < ring->num_slots; i++) {
-+		int len = dma_desc[i].ctl1 & BGMAC_DESC_CTL1_LEN;
-+
- 		slot = &ring->slots[i];
--		if (slot->skb) {
--			if (slot->dma_addr)
--				dma_unmap_single(dma_dev, slot->dma_addr,
--						 slot->skb->len, DMA_TO_DEVICE);
--			dev_kfree_skb(slot->skb);
--		}
-+		dev_kfree_skb(slot->skb);
-+
-+		if (!slot->dma_addr)
-+			continue;
-+
-+		if (slot->skb)
-+			dma_unmap_single(dma_dev, slot->dma_addr,
-+					 len, DMA_TO_DEVICE);
-+		else
-+			dma_unmap_page(dma_dev, slot->dma_addr,
-+				       len, DMA_TO_DEVICE);
- 	}
- }
- 
-@@ -1583,6 +1657,10 @@ static int bgmac_probe(struct bcma_devic
- 		goto err_dma_free;
- 	}
- 
-+	net_dev->features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
-+	net_dev->hw_features = net_dev->features;
-+	net_dev->vlan_features = net_dev->features;
-+
- 	err = register_netdev(bgmac->net_dev);
- 	if (err) {
- 		bgmac_err(bgmac, "Cannot register net device\n");