From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Shimoda, Yoshihiro" Subject: [PATCH 5/5] net: sh_eth: use NAPI Date: Fri, 16 Mar 2012 17:46:18 +0900 Message-ID: <4F62FDDA.9070708@renesas.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: SH-Linux To: netdev Return-path: Sender: linux-sh-owner@vger.kernel.org List-Id: netdev.vger.kernel.org This patch modifies the driver to use NAPI. Signed-off-by: Yoshihiro Shimoda --- drivers/net/ethernet/renesas/sh_eth.c | 88 +++++++++++++++++++++++---------- drivers/net/ethernet/renesas/sh_eth.h | 3 + 2 files changed, 64 insertions(+), 27 deletions(-) diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c index 62458d9..02878af 100644 --- a/drivers/net/ethernet/renesas/sh_eth.c +++ b/drivers/net/ethernet/renesas/sh_eth.c @@ -871,7 +871,7 @@ static int sh_eth_txfree(struct net_device *ndev) if (mdp->tx_skbuff[entry]) { dma_unmap_single(&ndev->dev, txdesc->addr, txdesc->buffer_length, DMA_TO_DEVICE); - dev_kfree_skb_irq(mdp->tx_skbuff[entry]); + dev_kfree_skb(mdp->tx_skbuff[entry]); mdp->tx_skbuff[entry] = NULL; freeNum++; } @@ -886,7 +886,7 @@ static int sh_eth_txfree(struct net_device *ndev) } /* Packet receive function */ -static int sh_eth_rx(struct net_device *ndev) +static int sh_eth_rx(struct net_device *ndev, int *work, int budget) { struct sh_eth_private *mdp = netdev_priv(ndev); struct sh_eth_rxdesc *rxdesc; @@ -898,7 +898,8 @@ static int sh_eth_rx(struct net_device *ndev) u32 desc_status; rxdesc = &mdp->rx_ring[entry]; - while (!(rxdesc->status & cpu_to_edmac(mdp, RD_RACT))) { + while (!(rxdesc->status & cpu_to_edmac(mdp, RD_RACT)) && + *work < budget) { desc_status = edmac_to_cpu(mdp, rxdesc->status); pkt_len = rxdesc->frame_length; @@ -934,13 +935,16 @@ static int sh_eth_rx(struct net_device *ndev) skb_reserve(skb, NET_IP_ALIGN); skb_put(skb, pkt_len); skb->protocol = eth_type_trans(skb, ndev); - netif_rx(skb); - ndev->stats.rx_packets++; - ndev->stats.rx_bytes += pkt_len; + if (netif_receive_skb(skb) == NET_RX_DROP) { + ndev->stats.rx_dropped++; + } else { + ndev->stats.rx_packets++; + ndev->stats.rx_bytes += pkt_len; + } } - rxdesc->status |= cpu_to_edmac(mdp, RD_RACT); entry = (++mdp->cur_rx) % RX_RING_SIZE; rxdesc = &mdp->rx_ring[entry]; + (*work)++; } /* Refill the Rx ring buffers. */ @@ -972,7 +976,7 @@ static int sh_eth_rx(struct net_device *ndev) /* Restart Rx engine if stopped. */ /* If we don't need to check status, don't. -KDU */ - if (!(sh_eth_read(ndev, EDRRR) & EDRRR_R)) { + if (*work < budget && !(sh_eth_read(ndev, EDRRR) & EDRRR_R)) { /* fix the values for the next receiving */ mdp->cur_rx = mdp->dirty_rx = (sh_eth_read(ndev, RDFAR) - sh_eth_read(ndev, RDLAR)) >> 4; @@ -1128,38 +1132,61 @@ static irqreturn_t sh_eth_interrupt(int irq, void *netdev) /* Get interrpt stat */ intr_status = sh_eth_read(ndev, EESR); - /* Clear interrupt */ if (intr_status & (EESR_FRC | EESR_RMAF | EESR_RRF | EESR_RTLF | EESR_RTSF | EESR_PRE | EESR_CERF | cd->tx_check | cd->eesr_err_check)) { - sh_eth_write(ndev, intr_status, EESR); + if (napi_schedule_prep(&mdp->napi)) { + /* Disable all interrupts */ + sh_eth_write(ndev, 0, EESIPR); + __napi_schedule(&mdp->napi); + } ret = IRQ_HANDLED; - } else - goto other_irq; - - if (intr_status & (EESR_FRC | /* Frame recv*/ - EESR_RMAF | /* Multi cast address recv*/ - EESR_RRF | /* Bit frame recv */ - EESR_RTLF | /* Long frame recv*/ - EESR_RTSF | /* short frame recv */ - EESR_PRE | /* PHY-LSI recv error */ - EESR_CERF)){ /* recv frame CRC error */ - sh_eth_rx(ndev); } - /* Tx Check */ - if (intr_status & cd->tx_check) { - sh_eth_txfree(ndev); + spin_unlock(&mdp->lock); + + return ret; +} + +static int sh_eth_poll(struct napi_struct *napi, int budget) +{ + struct sh_eth_private *mdp = container_of(napi, struct sh_eth_private, + napi); + struct net_device *ndev = mdp->ndev; + struct sh_eth_cpu_data *cd = mdp->cd; + int work_done = 0, txfree_num; + u32 intr_status = sh_eth_read(ndev, EESR); + + spin_lock(&mdp->lock); + + /* Clear interrupt flags */ + sh_eth_write(ndev, intr_status, EESR); + + /* check txdesc */ + txfree_num = sh_eth_txfree(ndev); + if (txfree_num) netif_wake_queue(ndev); - } + /* check rxdesc */ + sh_eth_rx(ndev, &work_done, budget); + + /* check error flags */ if (intr_status & cd->eesr_err_check) sh_eth_error(ndev, intr_status); -other_irq: + /* get current interrupt flags */ + intr_status = sh_eth_read(ndev, EESR); spin_unlock(&mdp->lock); - return ret; + /* check whether the controller doesn't have any events */ + if (!txfree_num && !(intr_status & cd->eesr_err_check) && + work_done < budget) { + napi_complete(napi); + /* Enable all interrupts */ + sh_eth_write(ndev, cd->eesipr_value, EESIPR); + } + + return work_done; } /* PHY state control function */ @@ -1380,6 +1407,8 @@ static int sh_eth_open(struct net_device *ndev) pm_runtime_get_sync(&mdp->pdev->dev); + napi_enable(&mdp->napi); + ret = request_irq(ndev->irq, sh_eth_interrupt, #if defined(CONFIG_CPU_SUBTYPE_SH7763) || \ defined(CONFIG_CPU_SUBTYPE_SH7764) || \ @@ -1520,6 +1549,8 @@ static int sh_eth_close(struct net_device *ndev) phy_disconnect(mdp->phydev); } + napi_disable(&mdp->napi); + free_irq(ndev->irq, ndev); /* Free all the skbuffs in the Rx queue. */ @@ -2152,6 +2183,9 @@ static int sh_eth_drv_probe(struct platform_device *pdev) #endif sh_eth_set_default_cpu_data(mdp->cd); + mdp->ndev = ndev; + netif_napi_add(ndev, &mdp->napi, sh_eth_poll, SH_ETH_NAPI_WEIGHT); + /* set function */ ndev->netdev_ops = &sh_eth_netdev_ops; SET_ETHTOOL_OPS(ndev, &sh_eth_ethtool_ops); diff --git a/drivers/net/ethernet/renesas/sh_eth.h b/drivers/net/ethernet/renesas/sh_eth.h index 667bdd2..9f4c91e 100644 --- a/drivers/net/ethernet/renesas/sh_eth.h +++ b/drivers/net/ethernet/renesas/sh_eth.h @@ -31,6 +31,7 @@ #define PKT_BUF_SZ 1538 #define SH_ETH_TSU_TIMEOUT_MS 500 #define SH_ETH_TSU_CAM_ENTRIES 32 +#define SH_ETH_NAPI_WEIGHT 32 enum { /* E-DMAC registers */ @@ -716,6 +717,8 @@ struct sh_eth_private { int duplex; int port; /* for TSU */ int vlan_num_ids; /* for VLAN tag filter */ + struct napi_struct napi; + struct net_device *ndev; unsigned no_ether_link:1; unsigned ether_link_active_low:1; -- 1.7.1