--- /dev/null
+From: Felix Fietkau <nbd@openwrt.org>
+Date: Sun, 12 Apr 2015 10:08:04 +0200
+Subject: [PATCH] bgmac: leave interrupts disabled as long as there is work
+ to do
+
+Always poll rx and tx during NAPI poll instead of relying on the status
+of the first interrupt. This prevents bgmac_poll from leaving unfinished
+work around until the next IRQ.
+In my tests this makes bridging/routing throughput under heavy load more
+stable and ensures that no new IRQs arrive as long as bgmac_poll uses up
+the entire budget.
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+---
+
+--- a/drivers/net/ethernet/broadcom/bgmac.c
++++ b/drivers/net/ethernet/broadcom/bgmac.c
+@@ -1109,8 +1109,6 @@ static void bgmac_chip_reset(struct bgma
+ bgmac_phy_init(bgmac);
+
+ netdev_reset_queue(bgmac->net_dev);
+-
+- bgmac->int_status = 0;
+ }
+
+ static void bgmac_chip_intrs_on(struct bgmac *bgmac)
+@@ -1225,14 +1223,13 @@ static irqreturn_t bgmac_interrupt(int i
+ if (!int_status)
+ return IRQ_NONE;
+
+- /* Ack */
+- bgmac_write(bgmac, BGMAC_INT_STATUS, int_status);
++ int_status &= ~(BGMAC_IS_TX0 | BGMAC_IS_RX);
++ if (int_status)
++ bgmac_err(bgmac, "Unknown IRQs: 0x%08X\n", int_status);
+
+ /* Disable new interrupts until handling existing ones */
+ bgmac_chip_intrs_off(bgmac);
+
+- bgmac->int_status = int_status;
+-
+ napi_schedule(&bgmac->napi);
+
+ return IRQ_HANDLED;
+@@ -1241,25 +1238,17 @@ static irqreturn_t bgmac_interrupt(int i
+ static int bgmac_poll(struct napi_struct *napi, int weight)
+ {
+ struct bgmac *bgmac = container_of(napi, struct bgmac, napi);
+- struct bgmac_dma_ring *ring;
+ int handled = 0;
+
+- if (bgmac->int_status & BGMAC_IS_TX0) {
+- ring = &bgmac->tx_ring[0];
+- bgmac_dma_tx_free(bgmac, ring);
+- bgmac->int_status &= ~BGMAC_IS_TX0;
+- }
++ /* Ack */
++ bgmac_write(bgmac, BGMAC_INT_STATUS, ~0);
+
+- if (bgmac->int_status & BGMAC_IS_RX) {
+- ring = &bgmac->rx_ring[0];
+- handled += bgmac_dma_rx_read(bgmac, ring, weight);
+- bgmac->int_status &= ~BGMAC_IS_RX;
+- }
++ bgmac_dma_tx_free(bgmac, &bgmac->tx_ring[0]);
++ handled += bgmac_dma_rx_read(bgmac, &bgmac->rx_ring[0], weight);
+
+- if (bgmac->int_status) {
+- bgmac_err(bgmac, "Unknown IRQs: 0x%08X\n", bgmac->int_status);
+- bgmac->int_status = 0;
+- }
++ /* Poll again if more events arrived in the meantime */
++ if (bgmac_read(bgmac, BGMAC_INT_STATUS) & (BGMAC_IS_TX0 | BGMAC_IS_RX))
++ return handled;
+
+ if (handled < weight) {
+ napi_complete(napi);
+--- a/drivers/net/ethernet/broadcom/bgmac.h
++++ b/drivers/net/ethernet/broadcom/bgmac.h
+@@ -452,7 +452,6 @@ struct bgmac {
+
+ /* Int */
+ u32 int_mask;
+- u32 int_status;
+
+ /* Current MAC state */
+ int mac_speed;
--- /dev/null
+From: Felix Fietkau <nbd@openwrt.org>
+Date: Sun, 12 Apr 2015 10:13:28 +0200
+Subject: [PATCH] bgmac: set received skb headroom to NET_SKB_PAD
+
+A packet buffer offset of 30 bytes is inefficient, because the first 2
+bytes end up in a different cacheline.
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+---
+
+--- a/drivers/net/ethernet/broadcom/bgmac.c
++++ b/drivers/net/ethernet/broadcom/bgmac.c
+@@ -346,13 +346,13 @@ static int bgmac_dma_rx_skb_for_slot(str
+ return -ENOMEM;
+
+ /* Poison - if everything goes fine, hardware will overwrite it */
+- rx = buf;
++ rx = buf + BGMAC_RX_BUF_OFFSET;
+ rx->len = cpu_to_le16(0xdead);
+ rx->flags = cpu_to_le16(0xbeef);
+
+ /* Map skb for the DMA */
+- dma_addr = dma_map_single(dma_dev, buf, BGMAC_RX_BUF_SIZE,
+- DMA_FROM_DEVICE);
++ dma_addr = dma_map_single(dma_dev, buf + BGMAC_RX_BUF_OFFSET,
++ BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE);
+ if (dma_mapping_error(dma_dev, dma_addr)) {
+ bgmac_err(bgmac, "DMA mapping error\n");
+ put_page(virt_to_head_page(buf));
+@@ -403,7 +403,7 @@ static int bgmac_dma_rx_read(struct bgma
+ while (ring->start != ring->end) {
+ struct device *dma_dev = bgmac->core->dma_dev;
+ struct bgmac_slot_info *slot = &ring->slots[ring->start];
+- struct bgmac_rx_header *rx = slot->buf;
++ struct bgmac_rx_header *rx = slot->buf + BGMAC_RX_BUF_OFFSET;
+ struct sk_buff *skb;
+ void *buf = slot->buf;
+ u16 len, flags;
+@@ -454,8 +454,10 @@ static int bgmac_dma_rx_read(struct bgma
+ BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE);
+
+ skb = build_skb(buf, BGMAC_RX_ALLOC_SIZE);
+- skb_put(skb, BGMAC_RX_FRAME_OFFSET + len);
+- skb_pull(skb, BGMAC_RX_FRAME_OFFSET);
++ skb_put(skb, BGMAC_RX_FRAME_OFFSET +
++ BGMAC_RX_BUF_OFFSET + len);
++ skb_pull(skb, BGMAC_RX_FRAME_OFFSET +
++ BGMAC_RX_BUF_OFFSET);
+
+ skb_checksum_none_assert(skb);
+ skb->protocol = eth_type_trans(skb, bgmac->net_dev);
+--- a/drivers/net/ethernet/broadcom/bgmac.h
++++ b/drivers/net/ethernet/broadcom/bgmac.h
+@@ -360,9 +360,11 @@
+
+ #define BGMAC_RX_HEADER_LEN 28 /* Last 24 bytes are unused. Well... */
+ #define BGMAC_RX_FRAME_OFFSET 30 /* There are 2 unused bytes between header and real data */
++#define BGMAC_RX_BUF_OFFSET (NET_SKB_PAD + NET_IP_ALIGN - \
++ BGMAC_RX_FRAME_OFFSET)
+ #define BGMAC_RX_MAX_FRAME_SIZE 1536 /* Copied from b44/tg3 */
+ #define BGMAC_RX_BUF_SIZE (BGMAC_RX_FRAME_OFFSET + BGMAC_RX_MAX_FRAME_SIZE)
+-#define BGMAC_RX_ALLOC_SIZE (SKB_DATA_ALIGN(BGMAC_RX_BUF_SIZE) + \
++#define BGMAC_RX_ALLOC_SIZE (SKB_DATA_ALIGN(BGMAC_RX_BUF_SIZE + BGMAC_RX_BUF_OFFSET) + \
+ SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
+
+ #define BGMAC_BFL_ENETROBO 0x0010 /* has ephy roboswitch spi */
--- /dev/null
+From: Felix Fietkau <nbd@openwrt.org>
+Date: Sun, 12 Apr 2015 22:23:07 +0200
+Subject: [PATCH] bgmac: simplify/optimize rx DMA error handling
+
+Allocate a new buffer before processing the completed one. If allocation
+fails, reuse the old buffer.
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+---
+
+--- a/drivers/net/ethernet/broadcom/bgmac.c
++++ b/drivers/net/ethernet/broadcom/bgmac.c
+@@ -386,6 +386,19 @@ static void bgmac_dma_rx_setup_desc(stru
+ dma_desc->ctl1 = cpu_to_le32(ctl1);
+ }
+
++static void bgmac_dma_rx_poison_buf(struct device *dma_dev,
++ struct bgmac_slot_info *slot)
++{
++ struct bgmac_rx_header *rx = slot->buf + BGMAC_RX_BUF_OFFSET;
++
++ dma_sync_single_for_cpu(dma_dev, slot->dma_addr, BGMAC_RX_BUF_SIZE,
++ DMA_FROM_DEVICE);
++ rx->len = cpu_to_le16(0xdead);
++ rx->flags = cpu_to_le16(0xbeef);
++ dma_sync_single_for_device(dma_dev, slot->dma_addr, BGMAC_RX_BUF_SIZE,
++ DMA_FROM_DEVICE);
++}
++
+ static int bgmac_dma_rx_read(struct bgmac *bgmac, struct bgmac_dma_ring *ring,
+ int weight)
+ {
+@@ -406,53 +419,35 @@ static int bgmac_dma_rx_read(struct bgma
+ struct bgmac_rx_header *rx = slot->buf + BGMAC_RX_BUF_OFFSET;
+ struct sk_buff *skb;
+ void *buf = slot->buf;
++ dma_addr_t dma_addr = slot->dma_addr;
+ u16 len, flags;
+
+- /* Unmap buffer to make it accessible to the CPU */
+- dma_sync_single_for_cpu(dma_dev, slot->dma_addr,
+- BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE);
+-
+- /* Get info from the header */
+- len = le16_to_cpu(rx->len);
+- flags = le16_to_cpu(rx->flags);
+-
+ do {
+- dma_addr_t old_dma_addr = slot->dma_addr;
+- int err;
++ /* Prepare new skb as replacement */
++ if (bgmac_dma_rx_skb_for_slot(bgmac, slot)) {
++ bgmac_dma_rx_poison_buf(dma_dev, slot);
++ break;
++ }
++
++ /* Unmap buffer to make it accessible to the CPU */
++ dma_unmap_single(dma_dev, dma_addr,
++ BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE);
++
++ /* Get info from the header */
++ len = le16_to_cpu(rx->len);
++ flags = le16_to_cpu(rx->flags);
+
+ /* Check for poison and drop or pass the packet */
+ if (len == 0xdead && flags == 0xbeef) {
+ bgmac_err(bgmac, "Found poisoned packet at slot %d, DMA issue!\n",
+ ring->start);
+- dma_sync_single_for_device(dma_dev,
+- slot->dma_addr,
+- BGMAC_RX_BUF_SIZE,
+- DMA_FROM_DEVICE);
++ put_page(virt_to_head_page(buf));
+ break;
+ }
+
+ /* Omit CRC. */
+ len -= ETH_FCS_LEN;
+
+- /* Prepare new skb as replacement */
+- err = bgmac_dma_rx_skb_for_slot(bgmac, slot);
+- if (err) {
+- /* Poison the old skb */
+- rx->len = cpu_to_le16(0xdead);
+- rx->flags = cpu_to_le16(0xbeef);
+-
+- dma_sync_single_for_device(dma_dev,
+- slot->dma_addr,
+- BGMAC_RX_BUF_SIZE,
+- DMA_FROM_DEVICE);
+- break;
+- }
+- bgmac_dma_rx_setup_desc(bgmac, ring, ring->start);
+-
+- /* Unmap old skb, we'll pass it to the netfif */
+- dma_unmap_single(dma_dev, old_dma_addr,
+- BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE);
+-
+ skb = build_skb(buf, BGMAC_RX_ALLOC_SIZE);
+ skb_put(skb, BGMAC_RX_FRAME_OFFSET +
+ BGMAC_RX_BUF_OFFSET + len);
+@@ -465,6 +460,8 @@ static int bgmac_dma_rx_read(struct bgma
+ handled++;
+ } while (0);
+
++ bgmac_dma_rx_setup_desc(bgmac, ring, ring->start);
++
+ if (++ring->start >= BGMAC_RX_RING_SLOTS)
+ ring->start = 0;
+
+@@ -532,14 +529,14 @@ static void bgmac_dma_rx_ring_free(struc
+
+ for (i = 0; i < ring->num_slots; i++) {
+ slot = &ring->slots[i];
+- if (!slot->buf)
++ if (!slot->dma_addr)
+ continue;
+
+- if (slot->dma_addr)
+- dma_unmap_single(dma_dev, slot->dma_addr,
+- BGMAC_RX_BUF_SIZE,
+- DMA_FROM_DEVICE);
++ dma_unmap_single(dma_dev, slot->dma_addr,
++ BGMAC_RX_BUF_SIZE,
++ DMA_FROM_DEVICE);
+ put_page(virt_to_head_page(slot->buf));
++ slot->dma_addr = 0;
+ }
+ }
+
--- /dev/null
+From: Felix Fietkau <nbd@openwrt.org>
+Date: Sun, 12 Apr 2015 22:28:20 +0200
+Subject: [PATCH] bgmac: add check for oversized packets
+
+In very rare cases, the MAC can catch an internal buffer that is bigger
+than it's supposed to be. Instead of crashing the kernel, simply pass
+the buffer back to the hardware
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+---
+
+--- a/drivers/net/ethernet/broadcom/bgmac.c
++++ b/drivers/net/ethernet/broadcom/bgmac.c
+@@ -445,6 +445,13 @@ static int bgmac_dma_rx_read(struct bgma
+ break;
+ }
+
++ if (len > BGMAC_RX_ALLOC_SIZE) {
++ bgmac_err(bgmac, "Found oversized packet at slot %d, DMA issue!\n",
++ ring->start);
++ put_page(virt_to_head_page(buf));
++ break;
++ }
++
+ /* Omit CRC. */
+ len -= ETH_FCS_LEN;
+
--- /dev/null
+From: Felix Fietkau <nbd@openwrt.org>
+Date: Sun, 12 Apr 2015 22:36:16 +0200
+Subject: [PATCH] bgmac: increase rx ring size from 511 to 512
+
+Limiting it to 511 looks like a failed attempt at leaving one descriptor
+empty to allow the hardware to stop processing a buffer that has not
+been prepared yet. However, this doesn't work because this affects the
+total ring size as well
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+---
+
+--- a/drivers/net/ethernet/broadcom/bgmac.h
++++ b/drivers/net/ethernet/broadcom/bgmac.h
+@@ -356,7 +356,7 @@
+ #define BGMAC_MAX_RX_RINGS 1
+
+ #define BGMAC_TX_RING_SLOTS 128
+-#define BGMAC_RX_RING_SLOTS 512 - 1 /* Why -1? Well, Broadcom does that... */
++#define BGMAC_RX_RING_SLOTS 512
+
+ #define BGMAC_RX_HEADER_LEN 28 /* Last 24 bytes are unused. Well... */
+ #define BGMAC_RX_FRAME_OFFSET 30 /* There are 2 unused bytes between header and real data */
--- /dev/null
+From: Felix Fietkau <nbd@openwrt.org>
+Date: Sun, 12 Apr 2015 23:19:32 +0200
+Subject: [PATCH] bgmac: simplify dma init/cleanup
+
+Instead of allocating buffers at device init time and initializing
+descriptors at device open, do both at the same time (during open).
+Free all buffers when closing the device.
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+---
+
+--- a/drivers/net/ethernet/broadcom/bgmac.c
++++ b/drivers/net/ethernet/broadcom/bgmac.c
+@@ -562,18 +562,26 @@ static void bgmac_dma_ring_desc_free(str
+ ring->dma_base);
+ }
+
+-static void bgmac_dma_free(struct bgmac *bgmac)
++static void bgmac_dma_cleanup(struct bgmac *bgmac)
+ {
+ int i;
+
+- for (i = 0; i < BGMAC_MAX_TX_RINGS; i++) {
++ for (i = 0; i < BGMAC_MAX_TX_RINGS; i++)
+ bgmac_dma_tx_ring_free(bgmac, &bgmac->tx_ring[i]);
+- bgmac_dma_ring_desc_free(bgmac, &bgmac->tx_ring[i]);
+- }
+- for (i = 0; i < BGMAC_MAX_RX_RINGS; i++) {
++
++ for (i = 0; i < BGMAC_MAX_RX_RINGS; i++)
+ bgmac_dma_rx_ring_free(bgmac, &bgmac->rx_ring[i]);
++}
++
++static void bgmac_dma_free(struct bgmac *bgmac)
++{
++ int i;
++
++ for (i = 0; i < BGMAC_MAX_TX_RINGS; i++)
++ bgmac_dma_ring_desc_free(bgmac, &bgmac->tx_ring[i]);
++
++ for (i = 0; i < BGMAC_MAX_RX_RINGS; i++)
+ bgmac_dma_ring_desc_free(bgmac, &bgmac->rx_ring[i]);
+- }
+ }
+
+ static int bgmac_dma_alloc(struct bgmac *bgmac)
+@@ -621,8 +629,6 @@ static int bgmac_dma_alloc(struct bgmac
+ }
+
+ for (i = 0; i < BGMAC_MAX_RX_RINGS; i++) {
+- int j;
+-
+ ring = &bgmac->rx_ring[i];
+ ring->num_slots = BGMAC_RX_RING_SLOTS;
+ ring->mmio_base = ring_base[i];
+@@ -645,15 +651,6 @@ static int bgmac_dma_alloc(struct bgmac
+ ring->index_base = lower_32_bits(ring->dma_base);
+ else
+ ring->index_base = 0;
+-
+- /* Alloc RX slots */
+- for (j = 0; j < ring->num_slots; j++) {
+- err = bgmac_dma_rx_skb_for_slot(bgmac, &ring->slots[j]);
+- if (err) {
+- bgmac_err(bgmac, "Can't allocate skb for slot in RX ring\n");
+- goto err_dma_free;
+- }
+- }
+ }
+
+ return 0;
+@@ -663,10 +660,10 @@ err_dma_free:
+ return -ENOMEM;
+ }
+
+-static void bgmac_dma_init(struct bgmac *bgmac)
++static int bgmac_dma_init(struct bgmac *bgmac)
+ {
+ struct bgmac_dma_ring *ring;
+- int i;
++ int i, err;
+
+ for (i = 0; i < BGMAC_MAX_TX_RINGS; i++) {
+ ring = &bgmac->tx_ring[i];
+@@ -698,8 +695,13 @@ static void bgmac_dma_init(struct bgmac
+ if (ring->unaligned)
+ bgmac_dma_rx_enable(bgmac, ring);
+
+- for (j = 0; j < ring->num_slots; j++)
++ for (j = 0; j < ring->num_slots; j++) {
++ err = bgmac_dma_rx_skb_for_slot(bgmac, &ring->slots[j]);
++ if (err)
++ goto error;
++
+ bgmac_dma_rx_setup_desc(bgmac, ring, j);
++ }
+
+ bgmac_write(bgmac, ring->mmio_base + BGMAC_DMA_RX_INDEX,
+ ring->index_base +
+@@ -708,6 +710,12 @@ static void bgmac_dma_init(struct bgmac
+ ring->start = 0;
+ ring->end = 0;
+ }
++
++ return 0;
++
++error:
++ bgmac_dma_cleanup(bgmac);
++ return err;
+ }
+
+ /**************************************************
+@@ -1183,11 +1191,8 @@ static void bgmac_enable(struct bgmac *b
+ }
+
+ /* http://bcm-v4.sipsolutions.net/mac-gbit/gmac/chipinit */
+-static void bgmac_chip_init(struct bgmac *bgmac, bool full_init)
++static void bgmac_chip_init(struct bgmac *bgmac)
+ {
+- struct bgmac_dma_ring *ring;
+- int i;
+-
+ /* 1 interrupt per received frame */
+ bgmac_write(bgmac, BGMAC_INT_RECV_LAZY, 1 << BGMAC_IRL_FC_SHIFT);
+
+@@ -1205,16 +1210,7 @@ static void bgmac_chip_init(struct bgmac
+
+ bgmac_write(bgmac, BGMAC_RXMAX_LENGTH, 32 + ETHER_MAX_LEN);
+
+- if (full_init) {
+- bgmac_dma_init(bgmac);
+- if (1) /* FIXME: is there any case we don't want IRQs? */
+- bgmac_chip_intrs_on(bgmac);
+- } else {
+- for (i = 0; i < BGMAC_MAX_RX_RINGS; i++) {
+- ring = &bgmac->rx_ring[i];
+- bgmac_dma_rx_enable(bgmac, ring);
+- }
+- }
++ bgmac_chip_intrs_on(bgmac);
+
+ bgmac_enable(bgmac);
+ }
+@@ -1274,23 +1270,27 @@ static int bgmac_open(struct net_device
+ int err = 0;
+
+ bgmac_chip_reset(bgmac);
++
++ err = bgmac_dma_init(bgmac);
++ if (err)
++ return err;
++
+ /* Specs say about reclaiming rings here, but we do that in DMA init */
+- bgmac_chip_init(bgmac, true);
++ bgmac_chip_init(bgmac);
+
+ err = request_irq(bgmac->core->irq, bgmac_interrupt, IRQF_SHARED,
+ KBUILD_MODNAME, net_dev);
+ if (err < 0) {
+ bgmac_err(bgmac, "IRQ request error: %d!\n", err);
+- goto err_out;
++ bgmac_dma_cleanup(bgmac);
++ return err;
+ }
+ napi_enable(&bgmac->napi);
+
+ phy_start(bgmac->phy_dev);
+
+ netif_carrier_on(net_dev);
+-
+-err_out:
+- return err;
++ return 0;
+ }
+
+ static int bgmac_stop(struct net_device *net_dev)
+@@ -1306,6 +1306,7 @@ static int bgmac_stop(struct net_device
+ free_irq(bgmac->core->irq, net_dev);
+
+ bgmac_chip_reset(bgmac);
++ bgmac_dma_cleanup(bgmac);
+
+ return 0;
+ }
--- /dev/null
+From: Felix Fietkau <nbd@openwrt.org>
+Date: Sun, 12 Apr 2015 11:59:47 +0200
+Subject: [PATCH] bgmac: fix DMA rx corruption
+
+The driver needs to inform the hardware about the first invalid (not yet
+filled) rx slot, by writing its DMA descriptor pointer offset to the
+BGMAC_DMA_RX_INDEX register.
+
+This register was set to a value exceeding the rx ring size, effectively
+allowing the hardware constant access to the full ring, regardless of
+which slots are initialized.
+
+To fix this issue, always mark the last filled rx slot as invalid.
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+---
+
+--- a/drivers/net/ethernet/broadcom/bgmac.c
++++ b/drivers/net/ethernet/broadcom/bgmac.c
+@@ -366,6 +366,16 @@ static int bgmac_dma_rx_skb_for_slot(str
+ return 0;
+ }
+
++static void bgmac_dma_rx_update_index(struct bgmac *bgmac,
++ struct bgmac_dma_ring *ring)
++{
++ wmb();
++
++ bgmac_write(bgmac, ring->mmio_base + BGMAC_DMA_RX_INDEX,
++ ring->index_base +
++ ring->end * sizeof(struct bgmac_dma_desc));
++}
++
+ static void bgmac_dma_rx_setup_desc(struct bgmac *bgmac,
+ struct bgmac_dma_ring *ring, int desc_idx)
+ {
+@@ -384,6 +394,8 @@ static void bgmac_dma_rx_setup_desc(stru
+ dma_desc->addr_high = cpu_to_le32(upper_32_bits(ring->slots[desc_idx].dma_addr));
+ dma_desc->ctl0 = cpu_to_le32(ctl0);
+ dma_desc->ctl1 = cpu_to_le32(ctl1);
++
++ ring->end = desc_idx;
+ }
+
+ static void bgmac_dma_rx_poison_buf(struct device *dma_dev,
+@@ -411,9 +423,7 @@ static int bgmac_dma_rx_read(struct bgma
+ end_slot &= BGMAC_DMA_RX_STATDPTR;
+ end_slot /= sizeof(struct bgmac_dma_desc);
+
+- ring->end = end_slot;
+-
+- while (ring->start != ring->end) {
++ while (ring->start != end_slot) {
+ struct device *dma_dev = bgmac->core->dma_dev;
+ struct bgmac_slot_info *slot = &ring->slots[ring->start];
+ struct bgmac_rx_header *rx = slot->buf + BGMAC_RX_BUF_OFFSET;
+@@ -476,6 +486,8 @@ static int bgmac_dma_rx_read(struct bgma
+ break;
+ }
+
++ bgmac_dma_rx_update_index(bgmac, ring);
++
+ return handled;
+ }
+
+@@ -695,6 +707,8 @@ static int bgmac_dma_init(struct bgmac *
+ if (ring->unaligned)
+ bgmac_dma_rx_enable(bgmac, ring);
+
++ ring->start = 0;
++ ring->end = 0;
+ for (j = 0; j < ring->num_slots; j++) {
+ err = bgmac_dma_rx_skb_for_slot(bgmac, &ring->slots[j]);
+ if (err)
+@@ -703,12 +717,7 @@ static int bgmac_dma_init(struct bgmac *
+ bgmac_dma_rx_setup_desc(bgmac, ring, j);
+ }
+
+- bgmac_write(bgmac, ring->mmio_base + BGMAC_DMA_RX_INDEX,
+- ring->index_base +
+- ring->num_slots * sizeof(struct bgmac_dma_desc));
+-
+- ring->start = 0;
+- ring->end = 0;
++ bgmac_dma_rx_update_index(bgmac, ring);
+ }
+
+ return 0;
--- /dev/null
+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;
+@@ -382,7 +382,7 @@ 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? */
+@@ -521,7 +521,7 @@ 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];
+@@ -546,7 +546,7 @@ 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->dma_addr)
+ continue;
+@@ -560,7 +560,8 @@ 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;
+@@ -569,7 +570,7 @@ 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);
+ }
+@@ -590,10 +591,12 @@ 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)
+@@ -616,11 +619,10 @@ 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);
+@@ -642,11 +644,10 @@ 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);
+@@ -709,7 +710,7 @@ 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)
+ goto error;
+--- 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];
--- /dev/null
+From: Felix Fietkau <nbd@openwrt.org>
+Date: Mon, 13 Apr 2015 15:54:04 +0200
+Subject: [PATCH] bgmac: fix MAC soft-reset bit for corerev > 4
+
+Only core revisions older than 4 use BGMAC_CMDCFG_SR_REV0
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+---
+
+--- a/drivers/net/ethernet/broadcom/bgmac.h
++++ b/drivers/net/ethernet/broadcom/bgmac.h
+@@ -198,9 +198,9 @@
+ #define BGMAC_CMDCFG_TAI 0x00000200
+ #define BGMAC_CMDCFG_HD 0x00000400 /* Set if in half duplex mode */
+ #define BGMAC_CMDCFG_HD_SHIFT 10
+-#define BGMAC_CMDCFG_SR_REV0 0x00000800 /* Set to reset mode, for other revs */
+-#define BGMAC_CMDCFG_SR_REV4 0x00002000 /* Set to reset mode, only for core rev 4 */
+-#define BGMAC_CMDCFG_SR(rev) ((rev == 4) ? BGMAC_CMDCFG_SR_REV4 : BGMAC_CMDCFG_SR_REV0)
++#define BGMAC_CMDCFG_SR_REV0 0x00000800 /* Set to reset mode, for core rev 0-3 */
++#define BGMAC_CMDCFG_SR_REV4 0x00002000 /* Set to reset mode, for core rev >= 4 */
++#define BGMAC_CMDCFG_SR(rev) ((rev >= 4) ? BGMAC_CMDCFG_SR_REV4 : BGMAC_CMDCFG_SR_REV0)
+ #define BGMAC_CMDCFG_ML 0x00008000 /* Set to activate mac loopback mode */
+ #define BGMAC_CMDCFG_AE 0x00400000
+ #define BGMAC_CMDCFG_CFE 0x00800000
--- /dev/null
+From: Felix Fietkau <nbd@openwrt.org>
+Date: Mon, 13 Apr 2015 15:56:26 +0200
+Subject: [PATCH] bgmac: reset all 4 GMAC cores on init
+
+On a BCM4709 based device, I found that GMAC cores may be enabled at
+probe time, but only become usable after a full reset.
+Disable cores before re-enabling them to ensure that they are properly
+reset.
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+---
+
+--- a/drivers/net/ethernet/broadcom/bgmac.c
++++ b/drivers/net/ethernet/broadcom/bgmac.c
+@@ -1623,8 +1623,11 @@ static int bgmac_probe(struct bcma_devic
+ ns_core = bcma_find_core_unit(core->bus,
+ BCMA_CORE_MAC_GBIT,
+ ns_gmac);
+- if (ns_core && !bcma_core_is_enabled(ns_core))
+- bcma_core_enable(ns_core, 0);
++ if (!ns_core)
++ continue;
++
++ bcma_core_disable(ns_core, 0);
++ bcma_core_enable(ns_core, 0);
+ }
+ }
+
--- /dev/null
+From 047f89922c6381432501f248d08226ff9adc4ee3 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
+Date: Thu, 23 Apr 2015 20:45:25 +0200
+Subject: [PATCH][FIX 4.1] bgmac: fix requests for extra polling calls from
+ NAPI
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+After d75b1ade567f ("net: less interrupt masking in NAPI") polling
+function has to return whole budget when it wants NAPI to call it again.
+
+Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
+Cc: Felix Fietkau <nbd@openwrt.org>
+Fixes: eb64e2923a886 ("bgmac: leave interrupts disabled as long as there is work to do")
+---
+ drivers/net/ethernet/broadcom/bgmac.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
+index de77d3a..21e3c38 100644
+--- a/drivers/net/ethernet/broadcom/bgmac.c
++++ b/drivers/net/ethernet/broadcom/bgmac.c
+@@ -1260,7 +1260,7 @@ static int bgmac_poll(struct napi_struct *napi, int weight)
+
+ /* Poll again if more events arrived in the meantime */
+ if (bgmac_read(bgmac, BGMAC_INT_STATUS) & (BGMAC_IS_TX0 | BGMAC_IS_RX))
+- return handled;
++ return weight;
+
+ if (handled < weight) {
+ napi_complete(napi);
+--
+1.8.4.5
+
projects / openwrt / staging / kaloz.git / commitdiff