diff options
Diffstat (limited to 'drivers/net/arm/ks8695net.c')
| -rw-r--r-- | drivers/net/arm/ks8695net.c | 131 |
1 files changed, 109 insertions, 22 deletions
diff --git a/drivers/net/arm/ks8695net.c b/drivers/net/arm/ks8695net.c index 2a7b7745cc5..be256b34cea 100644 --- a/drivers/net/arm/ks8695net.c +++ b/drivers/net/arm/ks8695net.c @@ -35,11 +35,13 @@ #include <mach/regs-switch.h> #include <mach/regs-misc.h> +#include <asm/mach/irq.h> +#include <mach/regs-irq.h> #include "ks8695net.h" #define MODULENAME "ks8695_ether" -#define MODULEVERSION "1.01" +#define MODULEVERSION "1.02" /* * Transmit and device reset timeout, default 5 seconds. @@ -95,6 +97,9 @@ struct ks8695_skbuff { #define MAX_RX_DESC 16 #define MAX_RX_DESC_MASK 0xf +/*napi_weight have better more than rx DMA buffers*/ +#define NAPI_WEIGHT 64 + #define MAX_RXBUF_SIZE 0x700 #define TX_RING_DMA_SIZE (sizeof(struct tx_ring_desc) * MAX_TX_DESC) @@ -120,6 +125,7 @@ enum ks8695_dtype { * @dev: The platform device object for this interface * @dtype: The type of this device * @io_regs: The ioremapped registers for this interface + * @napi : Add support NAPI for Rx * @rx_irq_name: The textual name of the RX IRQ from the platform data * @tx_irq_name: The textual name of the TX IRQ from the platform data * @link_irq_name: The textual name of the link IRQ from the @@ -143,6 +149,7 @@ enum ks8695_dtype { * @rx_ring_dma: The DMA mapped equivalent of rx_ring * @rx_buffers: The sk_buff mappings for the RX ring * @next_rx_desc_read: The next RX descriptor to read from on IRQ + * @rx_lock: A lock to protect Rx irq function * @msg_enable: The flags for which messages to emit */ struct ks8695_priv { @@ -152,6 +159,8 @@ struct ks8695_priv { enum ks8695_dtype dtype; void __iomem *io_regs; + struct napi_struct napi; + const char *rx_irq_name, *tx_irq_name, *link_irq_name; int rx_irq, tx_irq, link_irq; @@ -172,6 +181,7 @@ struct ks8695_priv { dma_addr_t rx_ring_dma; struct ks8695_skbuff rx_buffers[MAX_RX_DESC]; int next_rx_desc_read; + spinlock_t rx_lock; int msg_enable; }; @@ -392,29 +402,74 @@ ks8695_tx_irq(int irq, void *dev_id) } /** + * ks8695_get_rx_enable_bit - Get rx interrupt enable/status bit + * @ksp: Private data for the KS8695 Ethernet + * + * For KS8695 document: + * Interrupt Enable Register (offset 0xE204) + * Bit29 : WAN MAC Receive Interrupt Enable + * Bit16 : LAN MAC Receive Interrupt Enable + * Interrupt Status Register (Offset 0xF208) + * Bit29: WAN MAC Receive Status + * Bit16: LAN MAC Receive Status + * So, this Rx interrrupt enable/status bit number is equal + * as Rx IRQ number. + */ +static inline u32 ks8695_get_rx_enable_bit(struct ks8695_priv *ksp) +{ + return ksp->rx_irq; +} + +/** * ks8695_rx_irq - Receive IRQ handler * @irq: The IRQ which went off (ignored) * @dev_id: The net_device for the interrupt * - * Process the RX ring, passing any received packets up to the - * host. If we received anything other than errors, we then - * refill the ring. + * Inform NAPI that packet reception needs to be scheduled */ + static irqreturn_t ks8695_rx_irq(int irq, void *dev_id) { struct net_device *ndev = (struct net_device *)dev_id; struct ks8695_priv *ksp = netdev_priv(ndev); + + spin_lock(&ksp->rx_lock); + + if (napi_schedule_prep(&ksp->napi)) { + unsigned long status = readl(KS8695_IRQ_VA + KS8695_INTEN); + unsigned long mask_bit = 1 << ks8695_get_rx_enable_bit(ksp); + /*disable rx interrupt*/ + status &= ~mask_bit; + writel(status , KS8695_IRQ_VA + KS8695_INTEN); + __napi_schedule(&ksp->napi); + } + + spin_unlock(&ksp->rx_lock); + return IRQ_HANDLED; +} + +/** + * ks8695_rx - Receive packets called by NAPI poll method + * @ksp: Private data for the KS8695 Ethernet + * @budget: The max packets would be receive + */ + +static int ks8695_rx(struct ks8695_priv *ksp, int budget) +{ + struct net_device *ndev = ksp->ndev; struct sk_buff *skb; int buff_n; u32 flags; int pktlen; int last_rx_processed = -1; + int received = 0; buff_n = ksp->next_rx_desc_read; - do { - if (ksp->rx_buffers[buff_n].skb && - !(ksp->rx_ring[buff_n].status & cpu_to_le32(RDES_OWN))) { + while (received < budget + && ksp->rx_buffers[buff_n].skb + && (!(ksp->rx_ring[buff_n].status & + cpu_to_le32(RDES_OWN)))) { rmb(); flags = le32_to_cpu(ksp->rx_ring[buff_n].status); /* Found an SKB which we own, this means we @@ -464,7 +519,7 @@ ks8695_rx_irq(int irq, void *dev_id) /* Relinquish the SKB to the network layer */ skb_put(skb, pktlen); skb->protocol = eth_type_trans(skb, ndev); - netif_rx(skb); + netif_receive_skb(skb); /* Record stats */ ndev->stats.rx_packets++; @@ -478,29 +533,55 @@ rx_failure: /* Give the ring entry back to the hardware */ ksp->rx_ring[buff_n].status = cpu_to_le32(RDES_OWN); rx_finished: + received++; /* And note this as processed so we can start * from here next time */ last_rx_processed = buff_n; - } else { - /* Ran out of things to process, stop now */ - break; - } - buff_n = (buff_n + 1) & MAX_RX_DESC_MASK; - } while (buff_n != ksp->next_rx_desc_read); - - /* And note which RX descriptor we last did anything with */ - if (likely(last_rx_processed != -1)) - ksp->next_rx_desc_read = - (last_rx_processed + 1) & MAX_RX_DESC_MASK; - + buff_n = (buff_n + 1) & MAX_RX_DESC_MASK; + /*And note which RX descriptor we last did */ + if (likely(last_rx_processed != -1)) + ksp->next_rx_desc_read = + (last_rx_processed + 1) & + MAX_RX_DESC_MASK; + } /* And refill the buffers */ ks8695_refill_rxbuffers(ksp); - /* Kick the RX DMA engine, in case it became suspended */ + /* Kick the RX DMA engine, in case it became + * suspended */ ks8695_writereg(ksp, KS8695_DRSC, 0); + return received; +} - return IRQ_HANDLED; + +/** + * ks8695_poll - Receive packet by NAPI poll method + * @ksp: Private data for the KS8695 Ethernet + * @budget: The remaining number packets for network subsystem + * + * Invoked by the network core when it requests for new + * packets from the driver + */ +static int ks8695_poll(struct napi_struct *napi, int budget) +{ + struct ks8695_priv *ksp = container_of(napi, struct ks8695_priv, napi); + unsigned long work_done; + + unsigned long isr = readl(KS8695_IRQ_VA + KS8695_INTEN); + unsigned long mask_bit = 1 << ks8695_get_rx_enable_bit(ksp); + + work_done = ks8695_rx(ksp, budget); + + if (work_done < budget) { + unsigned long flags; + spin_lock_irqsave(&ksp->rx_lock, flags); + /*enable rx interrupt*/ + writel(isr | mask_bit, KS8695_IRQ_VA + KS8695_INTEN); + __napi_complete(napi); + spin_unlock_irqrestore(&ksp->rx_lock, flags); + } + return work_done; } /** @@ -1253,6 +1334,7 @@ ks8695_stop(struct net_device *ndev) struct ks8695_priv *ksp = netdev_priv(ndev); netif_stop_queue(ndev); + napi_disable(&ksp->napi); netif_carrier_off(ndev); ks8695_shutdown(ksp); @@ -1287,6 +1369,7 @@ ks8695_open(struct net_device *ndev) return ret; } + napi_enable(&ksp->napi); netif_start_queue(ndev); return 0; @@ -1472,6 +1555,8 @@ ks8695_probe(struct platform_device *pdev) SET_ETHTOOL_OPS(ndev, &ks8695_ethtool_ops); ndev->watchdog_timeo = msecs_to_jiffies(watchdog); + netif_napi_add(ndev, &ksp->napi, ks8695_poll, NAPI_WEIGHT); + /* Retrieve the default MAC addr from the chip. */ /* The bootloader should have left it in there for us. */ @@ -1505,6 +1590,7 @@ ks8695_probe(struct platform_device *pdev) /* And initialise the queue's lock */ spin_lock_init(&ksp->txq_lock); + spin_lock_init(&ksp->rx_lock); /* Specify the RX DMA ring buffer */ ksp->rx_ring = ksp->ring_base + TX_RING_DMA_SIZE; @@ -1626,6 +1712,7 @@ ks8695_drv_remove(struct platform_device *pdev) struct ks8695_priv *ksp = netdev_priv(ndev); platform_set_drvdata(pdev, NULL); + netif_napi_del(&ksp->napi); unregister_netdev(ndev); ks8695_release_device(ksp); |