kernel: bgmac: add more DMA related fixes

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

SVN-Revision: 45407

1 files changed, 132 insertions, 0 deletions

diff --git a/target/linux/generic/patches-3.18/077-12-bgmac-drop-ring-num_slots.patch b/target/linux/generic/patches-3.18/077-12-bgmac-drop-ring-num_slots.patch
new file mode 100644
index 0000000000..7525b63d6a
--- /dev/null
+++ b/target/linux/generic/patches-3.18/077-12-bgmac-drop-ring-num_slots.patch
@@ -0,0 +1,132 @@
+From: Felix Fietkau <nbd@openwrt.org>
+Date: Sun, 12 Apr 2015 23:28:38 +0200
+Subject: [PATCH] bgmac: drop ring->num_slots
+
+The ring size is always known at compile time, so make the code a bit
+more efficient
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+---
+
+--- a/drivers/net/ethernet/broadcom/bgmac.c
++++ b/drivers/net/ethernet/broadcom/bgmac.c
+@@ -123,7 +123,7 @@ bgmac_dma_tx_add_buf(struct bgmac *bgmac
+ 	struct bgmac_dma_desc *dma_desc;
+ 	u32 ctl1;
+ 
+-	if (i == ring->num_slots - 1)
++	if (i == BGMAC_TX_RING_SLOTS - 1)
+ 		ctl0 |= BGMAC_DESC_CTL0_EOT;
+ 
+ 	ctl1 = len & BGMAC_DESC_CTL1_LEN;
+@@ -378,7 +378,7 @@ static void bgmac_dma_rx_setup_desc(stru
+ 	struct bgmac_dma_desc *dma_desc = ring->cpu_base + desc_idx;
+ 	u32 ctl0 = 0, ctl1 = 0;
+ 
+-	if (desc_idx == ring->num_slots - 1)
++	if (desc_idx == BGMAC_RX_RING_SLOTS - 1)
+ 		ctl0 |= BGMAC_DESC_CTL0_EOT;
+ 	ctl1 |= BGMAC_RX_BUF_SIZE & BGMAC_DESC_CTL1_LEN;
+ 	/* Is there any BGMAC device that requires extension? */
+@@ -508,7 +508,7 @@ static void bgmac_dma_tx_ring_free(struc
+ 	struct bgmac_slot_info *slot;
+ 	int i;
+ 
+-	for (i = 0; i < ring->num_slots; i++) {
++	for (i = 0; i < BGMAC_TX_RING_SLOTS; i++) {
+ 		int len = dma_desc[i].ctl1 & BGMAC_DESC_CTL1_LEN;
+ 
+ 		slot = &ring->slots[i];
+@@ -533,7 +533,7 @@ static void bgmac_dma_rx_ring_free(struc
+ 	struct bgmac_slot_info *slot;
+ 	int i;
+ 
+-	for (i = 0; i < ring->num_slots; i++) {
++	for (i = 0; i < BGMAC_RX_RING_SLOTS; i++) {
+ 		slot = &ring->slots[i];
+ 		if (!slot->buf)
+ 			continue;
+@@ -547,7 +547,8 @@ static void bgmac_dma_rx_ring_free(struc
+ }
+ 
+ static void bgmac_dma_ring_desc_free(struct bgmac *bgmac,
+-				     struct bgmac_dma_ring *ring)
++				     struct bgmac_dma_ring *ring,
++				     int num_slots)
+ {
+ 	struct device *dma_dev = bgmac->core->dma_dev;
+ 	int size;
+@@ -556,7 +557,7 @@ static void bgmac_dma_ring_desc_free(str
+ 	    return;
+ 
+ 	/* Free ring of descriptors */
+-	size = ring->num_slots * sizeof(struct bgmac_dma_desc);
++	size = num_slots * sizeof(struct bgmac_dma_desc);
+ 	dma_free_coherent(dma_dev, size, ring->cpu_base,
+ 			  ring->dma_base);
+ }
+@@ -577,10 +578,12 @@ static void bgmac_dma_free(struct bgmac 
+ 	int i;
+ 
+ 	for (i = 0; i < BGMAC_MAX_TX_RINGS; i++)
+-		bgmac_dma_ring_desc_free(bgmac, &bgmac->tx_ring[i]);
++		bgmac_dma_ring_desc_free(bgmac, &bgmac->tx_ring[i],
++					 BGMAC_TX_RING_SLOTS);
+ 
+ 	for (i = 0; i < BGMAC_MAX_RX_RINGS; i++)
+-		bgmac_dma_ring_desc_free(bgmac, &bgmac->rx_ring[i]);
++		bgmac_dma_ring_desc_free(bgmac, &bgmac->rx_ring[i],
++					 BGMAC_RX_RING_SLOTS);
+ }
+ 
+ static int bgmac_dma_alloc(struct bgmac *bgmac)
+@@ -603,11 +606,10 @@ static int bgmac_dma_alloc(struct bgmac 
+ 
+ 	for (i = 0; i < BGMAC_MAX_TX_RINGS; i++) {
+ 		ring = &bgmac->tx_ring[i];
+-		ring->num_slots = BGMAC_TX_RING_SLOTS;
+ 		ring->mmio_base = ring_base[i];
+ 
+ 		/* Alloc ring of descriptors */
+-		size = ring->num_slots * sizeof(struct bgmac_dma_desc);
++		size = BGMAC_TX_RING_SLOTS * sizeof(struct bgmac_dma_desc);
+ 		ring->cpu_base = dma_zalloc_coherent(dma_dev, size,
+ 						     &ring->dma_base,
+ 						     GFP_KERNEL);
+@@ -629,11 +631,10 @@ static int bgmac_dma_alloc(struct bgmac 
+ 
+ 	for (i = 0; i < BGMAC_MAX_RX_RINGS; i++) {
+ 		ring = &bgmac->rx_ring[i];
+-		ring->num_slots = BGMAC_RX_RING_SLOTS;
+ 		ring->mmio_base = ring_base[i];
+ 
+ 		/* Alloc ring of descriptors */
+-		size = ring->num_slots * sizeof(struct bgmac_dma_desc);
++		size = BGMAC_RX_RING_SLOTS * sizeof(struct bgmac_dma_desc);
+ 		ring->cpu_base = dma_zalloc_coherent(dma_dev, size,
+ 						     &ring->dma_base,
+ 						     GFP_KERNEL);
+@@ -696,7 +697,7 @@ static int bgmac_dma_init(struct bgmac *
+ 
+ 		ring->start = 0;
+ 		ring->end = 0;
+-		for (j = 0; j < ring->num_slots; j++) {
++		for (j = 0; j < BGMAC_RX_RING_SLOTS; j++) {
+ 			err = bgmac_dma_rx_skb_for_slot(bgmac, &ring->slots[j]);
+ 			if (err)
+ 				return err;
+--- a/drivers/net/ethernet/broadcom/bgmac.h
++++ b/drivers/net/ethernet/broadcom/bgmac.h
+@@ -419,11 +419,10 @@ struct bgmac_dma_ring {
+ 	u32 start;
+ 	u32 end;
+ 
+-	u16 num_slots;
+-	u16 mmio_base;
+ 	struct bgmac_dma_desc *cpu_base;
+ 	dma_addr_t dma_base;
+ 	u32 index_base; /* Used for unaligned rings only, otherwise 0 */
++	u16 mmio_base;
+ 	bool unaligned;
+ 
+ 	struct bgmac_slot_info slots[BGMAC_RX_RING_SLOTS];