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Subject[PATCH] rionet: add memory access to simulated Ethernet over rapidio
Date
Through the newly added IO memory access of Rapidio, sender can
write directly to recipient's rx buffer, either by cpu or DMA engine.

Signed-off-by: Zhang Wei <zw@zh-kernel.org>
Signed-off-by: Li Yang <leoli@freescale.com>
---
drivers/net/Kconfig | 10 ++
drivers/net/rionet.c | 365 +++++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 371 insertions(+), 4 deletions(-)
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 214a92d..1e88e26 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -2736,6 +2736,16 @@ config RIONET_RX_SIZE
depends on RIONET
default "128"

+config RIONET_MEMMAP
+ bool "Use memory map instead of message"
+ depends on RIONET
+ default n
+
+config RIONET_DMA
+ bool "Use DMA for memory mapping data transfer"
+ depends on RIONET_MEMMAP && FSL_DMA
+ default y
+
config FDDI
tristate "FDDI driver support"
depends on (PCI || EISA || TC)
diff --git a/drivers/net/rionet.c b/drivers/net/rionet.c
index ec59e29..c38e51e 100644
--- a/drivers/net/rionet.c
+++ b/drivers/net/rionet.c
@@ -1,6 +1,8 @@
/*
* rionet - Ethernet driver over RapidIO messaging services
*
+ * Copyright (C) 2007-2009 Freescale Semiconductor, Inc.
+ *
* Copyright 2005 MontaVista Software, Inc.
* Matt Porter <mporter@kernel.crashing.org>
*
@@ -23,6 +25,7 @@
#include <linux/skbuff.h>
#include <linux/crc32.h>
#include <linux/ethtool.h>
+#include <linux/dmaengine.h>

#define DRV_NAME "rionet"
#define DRV_VERSION "0.2"
@@ -40,13 +43,48 @@ MODULE_LICENSE("GPL");
NETIF_MSG_TX_ERR)

#define RIONET_DOORBELL_JOIN 0x1000
+#ifdef CONFIG_RIONET_MEMMAP
+#define RIONET_DOORBELL_SEND 0x1001
+#define RIONET_DOORBELL_LEAVE 0x1002
+#else
#define RIONET_DOORBELL_LEAVE 0x1001
+#endif

#define RIONET_MAILBOX 0

#define RIONET_TX_RING_SIZE CONFIG_RIONET_TX_SIZE
#define RIONET_RX_RING_SIZE CONFIG_RIONET_RX_SIZE

+#define ERR(fmt, arg...) \
+ printk(KERN_ERR "ERROR %s - %s: " fmt, __FILE__, __func__, ## arg)
+
+#ifdef CONFIG_RIONET_MEMMAP
+/* Definitions for rionet memory map driver */
+#define RIONET_DRVID 0x101
+#define RIONET_MAX_SK_DATA_SIZE 0x1000
+#define RIONET_MEM_RIO_BASE 0x10000000
+#define RIONET_TX_RX_BUFF_SIZE (0x1000 * (128 + 128))
+#define RIONET_QUEUE_NEXT(x) (((x) < 127) ? ((x) + 1) : 0)
+#define RIONET_QUEUE_INC(x) (x = RIONET_QUEUE_NEXT(x))
+
+struct sk_data {
+ u8 data[0x1000];
+};
+
+#define RIONET_SKDATA_EN 0x80000000
+struct rionet_tx_rx_buff {
+ int enqueue; /* enqueue point */
+ int dequeue; /* dequeue point */
+ u32 size[128]; /* size[i] is skdata[i] size
+ * the most high bit [31] is
+ * enable bit. The
+ * max size is 4096.
+ */
+ u8 rev1[3576];
+ struct sk_data skdata[128]; /* all size are 0x1000 * 128 */
+};
+#endif /* CONFIG_RIONET_MEMMAP */
+
static LIST_HEAD(rionet_peers);

struct rionet_private {
@@ -60,6 +98,19 @@ struct rionet_private {
spinlock_t lock;
spinlock_t tx_lock;
u32 msg_enable;
+#ifdef CONFIG_RIONET_MEMMAP
+ struct rionet_tx_rx_buff *rxbuff;
+ struct rionet_tx_rx_buff __iomem *txbuff;
+ dma_addr_t rx_addr;
+ phys_addr_t tx_addr;
+ struct resource *riores;
+#ifdef CONFIG_RIONET_DMA
+ struct dma_chan *txdmachan;
+ struct dma_chan *rxdmachan;
+ struct dma_client rio_dma_client;
+ spinlock_t rio_dma_event_lock;
+#endif
+#endif
};

struct rionet_peer {
@@ -90,6 +141,7 @@ static struct rio_dev **rionet_active;
#define RIONET_MAC_MATCH(x) (*(u32 *)x == 0x00010001)
#define RIONET_GET_DESTID(x) (*(u16 *)(x + 4))

+#ifndef CONFIG_RIONET_MEMMAP
static int rionet_rx_clean(struct net_device *ndev)
{
int i;
@@ -108,9 +160,11 @@ static int rionet_rx_clean(struct net_device *ndev)

rnet->rx_skb[i]->data = data;
skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
+ rnet->rx_skb[i]->dev = ndev;
rnet->rx_skb[i]->protocol =
eth_type_trans(rnet->rx_skb[i], ndev);
error = netif_rx(rnet->rx_skb[i]);
+ rnet->rx_skb[i] = NULL;

if (error == NET_RX_DROP) {
ndev->stats.rx_dropped++;
@@ -128,6 +182,7 @@ static int rionet_rx_clean(struct net_device *ndev)

return i;
}
+#endif

static void rionet_rx_fill(struct net_device *ndev, int end)
{
@@ -141,19 +196,86 @@ static void rionet_rx_fill(struct net_device *ndev, int end)
if (!rnet->rx_skb[i])
break;

+#ifndef CONFIG_RIONET_MEMMAP
rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
rnet->rx_skb[i]->data);
+#endif
} while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);

rnet->rx_slot = i;
}

+#ifdef CONFIG_RIONET_MEMMAP
+static int rio_send_mem(struct sk_buff *skb,
+ struct net_device *ndev, struct rio_dev *rdev)
+{
+ struct rionet_private *rnet = netdev_priv(ndev);
+ int enqueue, dequeue;
+
+ if (!rdev)
+ return -EFAULT;
+
+ if (skb->len > RIONET_MAX_SK_DATA_SIZE) {
+ printk(KERN_ERR "Frame len is more than RIONET max sk_data!\n");
+ return -EINVAL;
+ }
+
+ rio_map_outb_region(rnet->mport, rdev->destid, rnet->riores,
+ rnet->tx_addr, 0);
+
+ enqueue = in_be32(&rnet->txbuff->enqueue);
+ dequeue = in_be32(&rnet->txbuff->dequeue);
+
+ if (!(in_be32(&rnet->txbuff->size[enqueue]) & RIONET_SKDATA_EN)
+ && (RIONET_QUEUE_NEXT(enqueue) != dequeue)) {
+#ifdef CONFIG_RIONET_DMA
+ struct dma_device *dmadev;
+ struct dma_async_tx_descriptor *tx;
+ dma_cookie_t tx_cookie = 0;
+
+ dmadev = rnet->txdmachan->device;
+ tx = dmadev->device_prep_dma_memcpy(rnet->txdmachan,
+ (void *)rnet->txbuff->skdata[enqueue].data
+ - (void *)rnet->txbuff rnet->tx_addr,
+ dma_map_single(&ndev->dev, skb->data, skb->len,
+ DMA_TO_DEVICE), skb->len, DMA_CTRL_ACK);
+ if (!tx)
+ return -EFAULT;
+ tx_cookie = tx->tx_submit(tx);
+
+ dma_async_memcpy_issue_pending(rnet->txdmachan);
+ while (dma_async_memcpy_complete(rnet->txdmachan,
+ tx_cookie, NULL, NULL) == DMA_IN_PROGRESS) ;
+#else
+ memcpy(rnet->txbuff->skdata[enqueue].data, skb->data, skb->len);
+#endif /* CONFIG_RIONET_DMA */
+ out_be32(&rnet->txbuff->size[enqueue],
+ RIONET_SKDATA_EN | skb->len);
+ out_be32(&rnet->txbuff->enqueue,
+ RIONET_QUEUE_NEXT(enqueue));
+ in_be32(&rnet->txbuff->enqueue); /* verify read */
+ } else if (netif_msg_tx_err(rnet))
+ printk(KERN_ERR "rionmet(memmap): txbuff is busy!\n");
+
+ rio_unmap_outb_region(rnet->mport, rnet->tx_addr);
+ rio_send_doorbell(rdev, RIONET_DOORBELL_SEND);
+ return 0;
+}
+#endif
+
static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
struct rio_dev *rdev)
{
struct rionet_private *rnet = netdev_priv(ndev);

+#ifdef CONFIG_RIONET_MEMMAP
+ int ret = 0;
+ ret = rio_send_mem(skb, ndev, rdev);
+ if (ret)
+ return ret;
+#else
rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
+#endif
rnet->tx_skb[rnet->tx_slot] = skb;

ndev->stats.tx_packets++;
@@ -165,6 +287,19 @@ static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
++rnet->tx_slot;
rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);

+#ifdef CONFIG_RIONET_MEMMAP
+ while (rnet->tx_cnt && (rnet->ack_slot != rnet->tx_slot)) {
+ /* dma unmap single */
+ dev_kfree_skb_any(rnet->tx_skb[rnet->ack_slot]);
+ rnet->tx_skb[rnet->ack_slot] = NULL;
+ ++rnet->ack_slot;
+ rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
+ rnet->tx_cnt--;
+ }
+
+ if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
+ netif_wake_queue(ndev);
+#endif
if (netif_msg_tx_queued(rnet))
printk(KERN_INFO "%s: queued skb %8.8x len %8.8x\n", DRV_NAME,
(u32) skb, skb->len);
@@ -211,6 +346,92 @@ static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
return 0;
}

+#ifdef CONFIG_RIONET_MEMMAP
+static void rio_recv_mem(struct net_device *ndev)
+{
+ struct rionet_private *rnet = netdev_priv(ndev);
+ struct sk_buff *skb;
+ u32 enqueue, dequeue, size;
+ int error = 0;
+#ifdef CONFIG_RIONET_DMA
+ dma_cookie_t rx_cookie = 0;
+ struct dma_device *dmadev;
+ struct dma_async_tx_descriptor *tx;
+#endif
+
+ dequeue = rnet->rxbuff->dequeue;
+ enqueue = rnet->rxbuff->enqueue;
+
+ while (enqueue != dequeue) {
+ size = rnet->rxbuff->size[dequeue];
+ if (!(size & RIONET_SKDATA_EN))
+ return;
+ size &= ~RIONET_SKDATA_EN;
+
+ skb = dev_alloc_skb(size + 2);
+ if (!skb)
+ return;
+
+#ifdef CONFIG_RIONET_DMA
+ dmadev = rnet->rxdmachan->device;
+ tx = dmadev->device_prep_dma_memcpy(rnet->rxdmachan,
+ dma_map_single(&ndev->dev, skb_put(skb, size),
+ size, DMA_FROM_DEVICE),
+ (void *)rnet->rxbuff->skdata[dequeue].data
+ - (void *)rnet->rxbuff + rnet->rx_addr,
+ size, DMA_CTRL_ACK);
+ if (!tx)
+ return;
+ rx_cookie = tx->tx_submit(tx);
+ dma_async_memcpy_issue_pending(rnet->rxdmachan);
+ while (dma_async_memcpy_complete(rnet->rxdmachan,
+ rx_cookie, NULL, NULL) == DMA_IN_PROGRESS);
+#else
+ memcpy(skb_put(skb, size),
+ rnet->rxbuff->skdata[dequeue].data,
+ size);
+#endif /* CONFIG_RIONET_DMA */
+ skb->dev = ndev;
+ skb->protocol = eth_type_trans(skb, ndev);
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+ error = netif_rx(skb);
+
+ rnet->rxbuff->size[dequeue] &= ~RIONET_SKDATA_EN;
+ rnet->rxbuff->dequeue = RIONET_QUEUE_NEXT(dequeue);
+ dequeue = RIONET_QUEUE_NEXT(dequeue);
+
+ if (error == NET_RX_DROP) {
+ ndev->stats.rx_dropped++;
+ } else if (error == NET_RX_BAD) {
+ if (netif_msg_rx_err(rnet))
+ printk(KERN_WARNING "%s: bad rx packet\n",
+ DRV_NAME);
+ ndev->stats.rx_errors++;
+ } else {
+ ndev->stats.rx_packets++;
+ ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
+ }
+ }
+}
+
+static void rionet_inb_recv_event(struct rio_mport *mport, void *dev_id)
+{
+ struct net_device *ndev = dev_id;
+ struct rionet_private *rnet = netdev_priv(ndev);
+ unsigned long flags;
+
+ if (netif_msg_intr(rnet))
+ printk(KERN_INFO "%s: inbound memory data receive event\n",
+ DRV_NAME);
+
+ spin_lock_irqsave(&rnet->lock, flags);
+ rio_recv_mem(ndev);
+ spin_unlock_irqrestore(&rnet->lock, flags);
+}
+#endif
+
+
static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
u16 info)
{
@@ -232,6 +453,10 @@ static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u
}
} else if (info == RIONET_DOORBELL_LEAVE) {
rionet_active[sid] = NULL;
+#ifdef CONFIG_RIONET_MEMMAP
+ } else if (info == RIONET_DOORBELL_SEND) {
+ rionet_inb_recv_event(mport, ndev);
+#endif
} else {
if (netif_msg_intr(rnet))
printk(KERN_WARNING "%s: unhandled doorbell\n",
@@ -239,6 +464,7 @@ static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u
}
}

+#ifndef CONFIG_RIONET_MEMMAP
static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
{
int n;
@@ -281,6 +507,58 @@ static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbo

spin_unlock(&rnet->lock);
}
+#endif
+
+#ifdef CONFIG_RIONET_DMA
+static enum dma_state_client rionet_dma_event(struct dma_client *client,
+ struct dma_chan *chan, enum dma_state state)
+{
+ struct rionet_private *rnet = container_of(client,
+ struct rionet_private, rio_dma_client);
+ enum dma_state_client ack = DMA_DUP;
+
+ spin_lock(&rnet->lock);
+ switch (state) {
+ case DMA_RESOURCE_AVAILABLE:
+ if (!rnet->txdmachan) {
+ ack = DMA_ACK;
+ rnet->txdmachan = chan;
+ } else if (!rnet->rxdmachan) {
+ ack = DMA_ACK;
+ rnet->rxdmachan = chan;
+ }
+ break;
+ case DMA_RESOURCE_REMOVED:
+ if (rnet->txdmachan == chan) {
+ ack = DMA_ACK;
+ rnet->txdmachan = NULL;
+ } else if (rnet->rxdmachan == chan) {
+ ack = DMA_ACK;
+ rnet->rxdmachan = NULL;
+ }
+ break;
+ default:
+ break;
+ }
+ spin_unlock(&rnet->lock);
+ return ack;
+}
+
+static int rionet_dma_register(struct rionet_private *rnet)
+{
+ int rc = 0;
+ spin_lock_init(&rnet->rio_dma_event_lock);
+ rnet->rio_dma_client.event_callback = rionet_dma_event;
+ dma_cap_set(DMA_MEMCPY, rnet->rio_dma_client.cap_mask);
+ dma_async_client_register(&rnet->rio_dma_client);
+ dma_async_client_chan_request(&rnet->rio_dma_client);
+
+ if (!rnet->txdmachan || !rnet->rxdmachan)
+ rc = -ENODEV;
+
+ return rc;
+}
+#endif

static int rionet_open(struct net_device *ndev)
{
@@ -297,21 +575,63 @@ static int rionet_open(struct net_device *ndev)
RIONET_DOORBELL_JOIN,
RIONET_DOORBELL_LEAVE,
rionet_dbell_event)) < 0)
- goto out;
+ return rc;
+
+#ifdef CONFIG_RIONET_MEMMAP
+ if (!request_rio_region(RIONET_MEM_RIO_BASE, RIONET_TX_RX_BUFF_SIZE,
+ ndev->name, 0)) {
+ dev_err(&ndev->dev, "RapidIO space busy\n");
+ rc = -EBUSY;
+ goto out1;
+ }

+ rnet->riores = kmalloc(sizeof(struct resource), GFP_KERNEL);
+ if (!rnet->riores) {
+ rc = -ENOMEM;
+ goto out2;
+ }
+ rnet->riores->start = RIONET_MEM_RIO_BASE;
+ rnet->riores->end = RIONET_MEM_RIO_BASE + RIONET_TX_RX_BUFF_SIZE - 1;
+ rnet->rxbuff = dma_alloc_coherent(&ndev->dev, RIONET_TX_RX_BUFF_SIZE,
+ &rnet->rx_addr, GFP_KERNEL);
+ if (!rnet->rxbuff) {
+ rc = -ENOMEM;
+ goto out3;
+ }
+ rc = rio_map_inb_region(rnet->mport, rnet->riores, rnet->rx_addr, 0);
+ if (rc) {
+ rc = -EBUSY;
+ goto out4;
+ }
+
+ /* Use space right after the doorbell window, aligned to
+ * size of RIONET_TX_RX_BUFF_SIZE */
+ rnet->tx_addr = rnet->mport->iores.start + 0x500000;
+ rnet->txbuff = ioremap(rnet->tx_addr, resource_size(rnet->riores));
+ if (!rnet->txbuff) {
+ rc = -ENOMEM;
+ goto out5;
+ }
+#ifdef CONFIG_RIONET_DMA
+ rc = rionet_dma_register(rnet);
+ if (rc)
+ goto out6;
+#endif /* CONFIG_RIONET_DMA */
+#else
if ((rc = rio_request_inb_mbox(rnet->mport,
(void *)ndev,
RIONET_MAILBOX,
RIONET_RX_RING_SIZE,
rionet_inb_msg_event)) < 0)
- goto out;
+ goto out1;

if ((rc = rio_request_outb_mbox(rnet->mport,
(void *)ndev,
RIONET_MAILBOX,
RIONET_TX_RING_SIZE,
rionet_outb_msg_event)) < 0)
- goto out;
+ goto out8;
+#endif

/* Initialize inbound message ring */
for (i = 0; i < RIONET_RX_RING_SIZE; i++)
@@ -344,8 +664,31 @@ static int rionet_open(struct net_device *ndev)
if (pwdcsr & RIO_DOORBELL_AVAIL)
rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
}
+ return 0;

- out:
+#ifndef CONFIG_RIONET_MEMMAP
+out8:
+ rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
+#else
+#ifdef CONFIG_RIONET_DMA
+out6:
+ iounmap(rnet->txbuff);
+#endif
+out5:
+ rio_unmap_inb_region(rnet->mport, rnet->rx_addr);
+out4:
+ dma_free_coherent(&ndev->dev, RIONET_TX_RX_BUFF_SIZE,
+ rnet->rxbuff, rnet->rx_addr);
+ rnet->rxbuff = NULL;
+ rnet->txbuff = NULL;
+out3:
+ kfree(rnet->riores);
+out2:
+ release_rio_region(RIONET_MEM_RIO_BASE, RIONET_TX_RX_BUFF_SIZE);
+#endif
+out1:
+ rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
+ RIONET_DOORBELL_LEAVE);
return rc;
}

@@ -374,8 +717,22 @@ static int rionet_close(struct net_device *ndev)

rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
RIONET_DOORBELL_LEAVE);
+#ifdef CONFIG_RIONET_MEMMAP
+ rio_unmap_inb_region(rnet->mport, rnet->rx_addr);
+ iounmap(rnet->txbuff);
+ dma_free_coherent(&ndev->dev, RIONET_TX_RX_BUFF_SIZE,
+ rnet->rxbuff, rnet->rx_addr);
+ kfree(rnet->riores);
+ release_rio_region(RIONET_MEM_RIO_BASE, RIONET_TX_RX_BUFF_SIZE);
+ rnet->rxbuff = NULL;
+ rnet->txbuff = NULL;
+#ifdef CONFIG_RIONET_DMA
+ dma_async_client_unregister(&rnet->rio_dma_client);
+#endif
+#else
rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
+#endif

return 0;
}
--
1.5.4


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