static char mv643xx_eth_driver_name[] = "mv643xx_eth";
static char mv643xx_eth_driver_version[] = "1.3";
-#define MV643XX_ETH_TX_FAST_REFILL
/*
* Registers shared between all ports.
#define TX_BW_MTU(p) (0x0458 + ((p) << 10))
#define TX_BW_BURST(p) (0x045c + ((p) << 10))
#define INT_CAUSE(p) (0x0460 + ((p) << 10))
-#define INT_TX_END_0 0x00080000
#define INT_TX_END 0x07f80000
#define INT_RX 0x000003fc
#define INT_EXT 0x00000002
struct work_struct tx_timeout_task;
struct mii_if_info mii;
+ struct napi_struct napi;
+ u8 work_link;
+ u8 work_tx;
+ u8 work_tx_end;
+ u8 work_rx;
+ u8 work_rx_refill;
+ u8 work_rx_oom;
+
/*
* RX state.
*/
unsigned long rx_desc_sram_addr;
int rx_desc_sram_size;
int rxq_count;
- struct napi_struct napi;
struct timer_list rx_oom;
struct rx_queue rxq[8];
int tx_desc_sram_size;
int txq_count;
struct tx_queue txq[8];
-#ifdef MV643XX_ETH_TX_FAST_REFILL
- int tx_clean_threshold;
-#endif
};
udelay(10);
}
-static void __txq_maybe_wake(struct tx_queue *txq)
+static void txq_maybe_wake(struct tx_queue *txq)
{
struct mv643xx_eth_private *mp = txq_to_mp(txq);
struct netdev_queue *nq = netdev_get_tx_queue(mp->dev, txq->index);
+ spin_lock(&mp->lock);
if (txq->tx_ring_size - txq->tx_desc_count >= MAX_SKB_FRAGS + 1)
netif_tx_wake_queue(nq);
+ spin_unlock(&mp->lock);
}
-/* rx ***********************************************************************/
-static void txq_reclaim(struct tx_queue *txq, int force);
-
-static int rxq_refill(struct rx_queue *rxq, int budget, int *oom)
-{
- int skb_size;
- int refilled;
-
- /*
- * Reserve 2+14 bytes for an ethernet header (the hardware
- * automatically prepends 2 bytes of dummy data to each
- * received packet), 16 bytes for up to four VLAN tags, and
- * 4 bytes for the trailing FCS -- 36 bytes total.
- */
- skb_size = rxq_to_mp(rxq)->dev->mtu + 36;
-
- /*
- * Make sure that the skb size is a multiple of 8 bytes, as
- * the lower three bits of the receive descriptor's buffer
- * size field are ignored by the hardware.
- */
- skb_size = (skb_size + 7) & ~7;
-
- refilled = 0;
- while (refilled < budget && rxq->rx_desc_count < rxq->rx_ring_size) {
- struct sk_buff *skb;
- int unaligned;
- int rx;
-
- skb = dev_alloc_skb(skb_size + dma_get_cache_alignment() - 1);
- if (skb == NULL) {
- *oom = 1;
- break;
- }
-
- unaligned = (u32)skb->data & (dma_get_cache_alignment() - 1);
- if (unaligned)
- skb_reserve(skb, dma_get_cache_alignment() - unaligned);
-
- refilled++;
- rxq->rx_desc_count++;
-
- rx = rxq->rx_used_desc++;
- if (rxq->rx_used_desc == rxq->rx_ring_size)
- rxq->rx_used_desc = 0;
-
- rxq->rx_desc_area[rx].buf_ptr = dma_map_single(NULL, skb->data,
- skb_size, DMA_FROM_DEVICE);
- rxq->rx_desc_area[rx].buf_size = skb_size;
- rxq->rx_skb[rx] = skb;
- wmb();
- rxq->rx_desc_area[rx].cmd_sts = BUFFER_OWNED_BY_DMA |
- RX_ENABLE_INTERRUPT;
- wmb();
-
- /*
- * The hardware automatically prepends 2 bytes of
- * dummy data to each received packet, so that the
- * IP header ends up 16-byte aligned.
- */
- skb_reserve(skb, 2);
- }
-
- return refilled;
-}
-
+/* rx napi ******************************************************************/
static int rxq_process(struct rx_queue *rxq, int budget)
{
struct mv643xx_eth_private *mp = rxq_to_mp(rxq);
rxq->rx_desc_count--;
rx++;
+ mp->work_rx_refill |= 1 << rxq->index;
+
/*
* Update statistics.
*
mp->dev->last_rx = jiffies;
}
+ if (rx < budget)
+ mp->work_rx &= ~(1 << rxq->index);
+
return rx;
}
-static int mv643xx_eth_poll(struct napi_struct *napi, int budget)
+static int rxq_refill(struct rx_queue *rxq, int budget)
{
- struct mv643xx_eth_private *mp;
- int work_done;
- int oom;
- int i;
+ struct mv643xx_eth_private *mp = rxq_to_mp(rxq);
+ int skb_size;
+ int refilled;
- mp = container_of(napi, struct mv643xx_eth_private, napi);
+ /*
+ * Reserve 2+14 bytes for an ethernet header (the hardware
+ * automatically prepends 2 bytes of dummy data to each
+ * received packet), 16 bytes for up to four VLAN tags, and
+ * 4 bytes for the trailing FCS -- 36 bytes total.
+ */
+ skb_size = rxq_to_mp(rxq)->dev->mtu + 36;
-#ifdef MV643XX_ETH_TX_FAST_REFILL
- if (++mp->tx_clean_threshold > 5) {
- mp->tx_clean_threshold = 0;
- for (i = 0; i < mp->txq_count; i++)
- txq_reclaim(mp->txq + i, 0);
+ /*
+ * Make sure that the skb size is a multiple of 8 bytes, as
+ * the lower three bits of the receive descriptor's buffer
+ * size field are ignored by the hardware.
+ */
+ skb_size = (skb_size + 7) & ~7;
- spin_lock_irq(&mp->lock);
- __txq_maybe_wake(mp->txq);
- spin_unlock_irq(&mp->lock);
- }
-#endif
+ refilled = 0;
+ while (refilled < budget && rxq->rx_desc_count < rxq->rx_ring_size) {
+ struct sk_buff *skb;
+ int unaligned;
+ int rx;
- work_done = 0;
- oom = 0;
- for (i = mp->rxq_count - 1; work_done < budget && i >= 0; i--) {
- struct rx_queue *rxq = mp->rxq + i;
+ skb = dev_alloc_skb(skb_size + dma_get_cache_alignment() - 1);
+ if (skb == NULL) {
+ mp->work_rx_oom |= 1 << rxq->index;
+ goto oom;
+ }
- work_done += rxq_process(rxq, budget - work_done);
- work_done += rxq_refill(rxq, budget - work_done, &oom);
- }
+ unaligned = (u32)skb->data & (dma_get_cache_alignment() - 1);
+ if (unaligned)
+ skb_reserve(skb, dma_get_cache_alignment() - unaligned);
- if (work_done < budget) {
- if (oom)
- mod_timer(&mp->rx_oom, jiffies + (HZ / 10));
- netif_rx_complete(mp->dev, napi);
- wrl(mp, INT_MASK(mp->port_num), INT_TX_END | INT_RX | INT_EXT);
- }
+ refilled++;
+ rxq->rx_desc_count++;
- return work_done;
-}
+ rx = rxq->rx_used_desc++;
+ if (rxq->rx_used_desc == rxq->rx_ring_size)
+ rxq->rx_used_desc = 0;
-static inline void oom_timer_wrapper(unsigned long data)
-{
- struct mv643xx_eth_private *mp = (void *)data;
+ rxq->rx_desc_area[rx].buf_ptr = dma_map_single(NULL, skb->data,
+ skb_size, DMA_FROM_DEVICE);
+ rxq->rx_desc_area[rx].buf_size = skb_size;
+ rxq->rx_skb[rx] = skb;
+ wmb();
+ rxq->rx_desc_area[rx].cmd_sts = BUFFER_OWNED_BY_DMA |
+ RX_ENABLE_INTERRUPT;
+ wmb();
- napi_schedule(&mp->napi);
+ /*
+ * The hardware automatically prepends 2 bytes of
+ * dummy data to each received packet, so that the
+ * IP header ends up 16-byte aligned.
+ */
+ skb_reserve(skb, 2);
+ }
+
+ if (refilled < budget)
+ mp->work_rx_refill &= ~(1 << rxq->index);
+
+oom:
+ return refilled;
}
wmb();
desc->cmd_sts = cmd_sts;
- /* clear TX_END interrupt status */
- wrl(mp, INT_CAUSE(mp->port_num), ~(INT_TX_END_0 << txq->index));
- rdl(mp, INT_CAUSE(mp->port_num));
+ /* clear TX_END status */
+ mp->work_tx_end &= ~(1 << txq->index);
/* ensure all descriptors are written before poking hardware */
wmb();
int queue;
struct tx_queue *txq;
struct netdev_queue *nq;
- unsigned long flags;
int entries_left;
if (has_tiny_unaligned_frags(skb) && __skb_linearize(skb)) {
txq = mp->txq + queue;
nq = netdev_get_tx_queue(dev, queue);
- spin_lock_irqsave(&mp->lock, flags);
+ spin_lock(&mp->lock);
if (txq->tx_ring_size - txq->tx_desc_count < MAX_SKB_FRAGS + 1) {
- spin_unlock_irqrestore(&mp->lock, flags);
+ spin_unlock(&mp->lock);
if (net_ratelimit())
dev_printk(KERN_ERR, &dev->dev, "tx queue full?!\n");
kfree_skb(skb);
if (entries_left < MAX_SKB_FRAGS + 1)
netif_tx_stop_queue(nq);
- spin_unlock_irqrestore(&mp->lock, flags);
+ spin_unlock(&mp->lock);
return NETDEV_TX_OK;
}
+/* tx napi ******************************************************************/
+static void txq_kick(struct tx_queue *txq)
+{
+ struct mv643xx_eth_private *mp = txq_to_mp(txq);
+ u32 hw_desc_ptr;
+ u32 expected_ptr;
+
+ spin_lock(&mp->lock);
+
+ if (rdl(mp, TXQ_COMMAND(mp->port_num)) & (1 << txq->index))
+ goto out;
+
+ hw_desc_ptr = rdl(mp, TXQ_CURRENT_DESC_PTR(mp->port_num, txq->index));
+ expected_ptr = (u32)txq->tx_desc_dma +
+ txq->tx_curr_desc * sizeof(struct tx_desc);
+
+ if (hw_desc_ptr != expected_ptr)
+ txq_enable(txq);
+
+out:
+ spin_unlock(&mp->lock);
+
+ mp->work_tx_end &= ~(1 << txq->index);
+}
+
+static int txq_reclaim(struct tx_queue *txq, int budget, int force)
+{
+ struct mv643xx_eth_private *mp = txq_to_mp(txq);
+ int reclaimed;
+
+ spin_lock(&mp->lock);
+
+ reclaimed = 0;
+ while (reclaimed < budget && txq->tx_desc_count > 0) {
+ int tx_index;
+ struct tx_desc *desc;
+ u32 cmd_sts;
+ struct sk_buff *skb;
+ dma_addr_t addr;
+ int count;
+
+ tx_index = txq->tx_used_desc;
+ desc = &txq->tx_desc_area[tx_index];
+ cmd_sts = desc->cmd_sts;
+
+ if (cmd_sts & BUFFER_OWNED_BY_DMA) {
+ if (!force)
+ break;
+ desc->cmd_sts = cmd_sts & ~BUFFER_OWNED_BY_DMA;
+ }
+
+ txq->tx_used_desc = tx_index + 1;
+ if (txq->tx_used_desc == txq->tx_ring_size)
+ txq->tx_used_desc = 0;
+
+ reclaimed++;
+ txq->tx_desc_count--;
+
+ addr = desc->buf_ptr;
+ count = desc->byte_cnt;
+ skb = txq->tx_skb[tx_index];
+ txq->tx_skb[tx_index] = NULL;
+
+ if (cmd_sts & ERROR_SUMMARY) {
+ dev_printk(KERN_INFO, &mp->dev->dev, "tx error\n");
+ mp->dev->stats.tx_errors++;
+ }
+
+ /*
+ * Drop mp->lock while we free the skb.
+ */
+ spin_unlock(&mp->lock);
+
+ if (cmd_sts & TX_FIRST_DESC)
+ dma_unmap_single(NULL, addr, count, DMA_TO_DEVICE);
+ else
+ dma_unmap_page(NULL, addr, count, DMA_TO_DEVICE);
+
+ if (skb)
+ dev_kfree_skb(skb);
+
+ spin_lock(&mp->lock);
+ }
+
+ if (reclaimed < budget)
+ mp->work_tx &= ~(1 << txq->index);
+
+ spin_unlock(&mp->lock);
+
+ return reclaimed;
+}
+
+
/* tx rate control **********************************************************/
/*
* Set total maximum TX rate (shared by all TX queues for this port)
return 0;
-
out_free:
if (index == 0 && size <= mp->tx_desc_sram_size)
iounmap(txq->tx_desc_area);
return -ENOMEM;
}
-static void txq_reclaim(struct tx_queue *txq, int force)
+static void txq_deinit(struct tx_queue *txq)
{
struct mv643xx_eth_private *mp = txq_to_mp(txq);
- unsigned long flags;
- spin_lock_irqsave(&mp->lock, flags);
- while (txq->tx_desc_count > 0) {
- int tx_index;
- struct tx_desc *desc;
- u32 cmd_sts;
- struct sk_buff *skb;
- dma_addr_t addr;
- int count;
+ txq_disable(txq);
+ txq_reclaim(txq, txq->tx_ring_size, 1);
- tx_index = txq->tx_used_desc;
- desc = &txq->tx_desc_area[tx_index];
- cmd_sts = desc->cmd_sts;
+ BUG_ON(txq->tx_used_desc != txq->tx_curr_desc);
- if (cmd_sts & BUFFER_OWNED_BY_DMA) {
- if (!force)
- break;
- desc->cmd_sts = cmd_sts & ~BUFFER_OWNED_BY_DMA;
- }
+ if (txq->index == 0 &&
+ txq->tx_desc_area_size <= mp->tx_desc_sram_size)
+ iounmap(txq->tx_desc_area);
+ else
+ dma_free_coherent(NULL, txq->tx_desc_area_size,
+ txq->tx_desc_area, txq->tx_desc_dma);
- txq->tx_used_desc = tx_index + 1;
- if (txq->tx_used_desc == txq->tx_ring_size)
- txq->tx_used_desc = 0;
- txq->tx_desc_count--;
+ kfree(txq->tx_skb);
+}
- addr = desc->buf_ptr;
- count = desc->byte_cnt;
- skb = txq->tx_skb[tx_index];
- txq->tx_skb[tx_index] = NULL;
- if (cmd_sts & ERROR_SUMMARY) {
- dev_printk(KERN_INFO, &mp->dev->dev, "tx error\n");
- mp->dev->stats.tx_errors++;
- }
+/* netdev ops and related ***************************************************/
+static int mv643xx_eth_collect_events(struct mv643xx_eth_private *mp)
+{
+ u32 int_cause;
+ u32 int_cause_ext;
- /*
- * Drop mp->lock while we free the skb.
- */
- spin_unlock_irqrestore(&mp->lock, flags);
+ int_cause = rdl(mp, INT_CAUSE(mp->port_num)) &
+ (INT_TX_END | INT_RX | INT_EXT);
+ if (int_cause == 0)
+ return 0;
- if (cmd_sts & TX_FIRST_DESC)
- dma_unmap_single(NULL, addr, count, DMA_TO_DEVICE);
- else
- dma_unmap_page(NULL, addr, count, DMA_TO_DEVICE);
+ int_cause_ext = 0;
+ if (int_cause & INT_EXT)
+ int_cause_ext = rdl(mp, INT_CAUSE_EXT(mp->port_num));
- if (skb)
- dev_kfree_skb_irq(skb);
+ int_cause &= INT_TX_END | INT_RX;
+ if (int_cause) {
+ wrl(mp, INT_CAUSE(mp->port_num), ~int_cause);
+ mp->work_tx_end |= ((int_cause & INT_TX_END) >> 19) &
+ ~(rdl(mp, TXQ_COMMAND(mp->port_num)) & 0xff);
+ mp->work_rx |= (int_cause & INT_RX) >> 2;
+ }
- spin_lock_irqsave(&mp->lock, flags);
+ int_cause_ext &= INT_EXT_LINK_PHY | INT_EXT_TX;
+ if (int_cause_ext) {
+ wrl(mp, INT_CAUSE_EXT(mp->port_num), ~int_cause_ext);
+ if (int_cause_ext & INT_EXT_LINK_PHY)
+ mp->work_link = 1;
+ mp->work_tx |= int_cause_ext & INT_EXT_TX;
}
- spin_unlock_irqrestore(&mp->lock, flags);
+
+ return 1;
}
-static void txq_deinit(struct tx_queue *txq)
+static irqreturn_t mv643xx_eth_irq(int irq, void *dev_id)
{
- struct mv643xx_eth_private *mp = txq_to_mp(txq);
-
- txq_disable(txq);
- txq_reclaim(txq, 1);
+ struct net_device *dev = (struct net_device *)dev_id;
+ struct mv643xx_eth_private *mp = netdev_priv(dev);
- BUG_ON(txq->tx_used_desc != txq->tx_curr_desc);
+ if (unlikely(!mv643xx_eth_collect_events(mp)))
+ return IRQ_NONE;
- if (txq->index == 0 &&
- txq->tx_desc_area_size <= mp->tx_desc_sram_size)
- iounmap(txq->tx_desc_area);
- else
- dma_free_coherent(NULL, txq->tx_desc_area_size,
- txq->tx_desc_area, txq->tx_desc_dma);
+ wrl(mp, INT_MASK(mp->port_num), 0);
+ napi_schedule(&mp->napi);
- kfree(txq->tx_skb);
+ return IRQ_HANDLED;
}
-
-/* netdev ops and related ***************************************************/
static void handle_link_event(struct mv643xx_eth_private *mp)
{
struct net_device *dev = mp->dev;
for (i = 0; i < mp->txq_count; i++) {
struct tx_queue *txq = mp->txq + i;
- txq_reclaim(txq, 1);
+ txq_reclaim(txq, txq->tx_ring_size, 1);
txq_reset_hw_ptr(txq);
}
}
netif_carrier_on(dev);
}
-static irqreturn_t mv643xx_eth_irq(int irq, void *dev_id)
+static int mv643xx_eth_poll(struct napi_struct *napi, int budget)
{
- struct net_device *dev = (struct net_device *)dev_id;
- struct mv643xx_eth_private *mp = netdev_priv(dev);
- u32 int_cause;
- u32 int_cause_ext;
+ struct mv643xx_eth_private *mp;
+ int work_done;
- int_cause = rdl(mp, INT_CAUSE(mp->port_num)) &
- (INT_TX_END | INT_RX | INT_EXT);
- if (int_cause == 0)
- return IRQ_NONE;
+ mp = container_of(napi, struct mv643xx_eth_private, napi);
- int_cause_ext = 0;
- if (int_cause & INT_EXT) {
- int_cause_ext = rdl(mp, INT_CAUSE_EXT(mp->port_num))
- & (INT_EXT_LINK_PHY | INT_EXT_TX);
- wrl(mp, INT_CAUSE_EXT(mp->port_num), ~int_cause_ext);
- }
+ mp->work_rx_refill |= mp->work_rx_oom;
+ mp->work_rx_oom = 0;
- if (int_cause_ext & INT_EXT_LINK_PHY)
- handle_link_event(mp);
+ work_done = 0;
+ while (work_done < budget) {
+ u8 queue_mask;
+ int queue;
+ int work_tbd;
+
+ if (mp->work_link) {
+ mp->work_link = 0;
+ handle_link_event(mp);
+ continue;
+ }
- /*
- * RxBuffer or RxError set for any of the 8 queues?
- */
- if (int_cause & INT_RX) {
- wrl(mp, INT_CAUSE(mp->port_num), ~(int_cause & INT_RX));
- wrl(mp, INT_MASK(mp->port_num), 0x00000000);
- rdl(mp, INT_MASK(mp->port_num));
+ queue_mask = mp->work_tx | mp->work_tx_end |
+ mp->work_rx | mp->work_rx_refill;
+ if (!queue_mask) {
+ if (mv643xx_eth_collect_events(mp))
+ continue;
+ break;
+ }
- napi_schedule(&mp->napi);
+ queue = fls(queue_mask) - 1;
+ queue_mask = 1 << queue;
+
+ work_tbd = budget - work_done;
+ if (work_tbd > 16)
+ work_tbd = 16;
+
+ if (mp->work_tx_end & queue_mask) {
+ txq_kick(mp->txq + queue);
+ } else if (mp->work_tx & queue_mask) {
+ work_done += txq_reclaim(mp->txq + queue, work_tbd, 0);
+ txq_maybe_wake(mp->txq + queue);
+ } else if (mp->work_rx & queue_mask) {
+ work_done += rxq_process(mp->rxq + queue, work_tbd);
+ } else if (mp->work_rx_refill & queue_mask) {
+ work_done += rxq_refill(mp->rxq + queue, work_tbd);
+ } else {
+ BUG();
+ }
}
- /*
- * TxBuffer or TxError set for any of the 8 queues?
- */
- if (int_cause_ext & INT_EXT_TX) {
- int i;
-
- for (i = 0; i < mp->txq_count; i++)
- txq_reclaim(mp->txq + i, 0);
-
- /*
- * Enough space again in the primary TX queue for a
- * full packet?
- */
- spin_lock(&mp->lock);
- __txq_maybe_wake(mp->txq);
- spin_unlock(&mp->lock);
+ if (work_done < budget) {
+ if (mp->work_rx_oom)
+ mod_timer(&mp->rx_oom, jiffies + (HZ / 10));
+ napi_complete(napi);
+ wrl(mp, INT_MASK(mp->port_num), INT_TX_END | INT_RX | INT_EXT);
}
- /*
- * Any TxEnd interrupts?
- */
- if (int_cause & INT_TX_END) {
- int i;
-
- wrl(mp, INT_CAUSE(mp->port_num), ~(int_cause & INT_TX_END));
-
- spin_lock(&mp->lock);
- for (i = 0; i < 8; i++) {
- struct tx_queue *txq = mp->txq + i;
- u32 hw_desc_ptr;
- u32 expected_ptr;
-
- if ((int_cause & (INT_TX_END_0 << i)) == 0)
- continue;
-
- hw_desc_ptr =
- rdl(mp, TXQ_CURRENT_DESC_PTR(mp->port_num, i));
- expected_ptr = (u32)txq->tx_desc_dma +
- txq->tx_curr_desc * sizeof(struct tx_desc);
+ return work_done;
+}
- if (hw_desc_ptr != expected_ptr)
- txq_enable(txq);
- }
- spin_unlock(&mp->lock);
- }
+static inline void oom_timer_wrapper(unsigned long data)
+{
+ struct mv643xx_eth_private *mp = (void *)data;
- return IRQ_HANDLED;
+ napi_schedule(&mp->napi);
}
static void phy_reset(struct mv643xx_eth_private *mp)
{
struct mv643xx_eth_private *mp = netdev_priv(dev);
int err;
- int oom;
int i;
wrl(mp, INT_CAUSE(mp->port_num), 0);
napi_enable(&mp->napi);
- oom = 0;
for (i = 0; i < mp->rxq_count; i++) {
err = rxq_init(mp, i);
if (err) {
goto out;
}
- rxq_refill(mp->rxq + i, INT_MAX, &oom);
+ rxq_refill(mp->rxq + i, INT_MAX);
}
- if (oom) {
+ if (mp->work_rx_oom) {
mp->rx_oom.expires = jiffies + (HZ / 10);
add_timer(&mp->rx_oom);
}
projects / linux-2.6-omap-h63xx.git / commitdiff