| /* Synopsys DesignWare Core Enterprise Ethernet (XLGMAC) Driver |
| * |
| * Copyright (c) 2017 Synopsys, Inc. (www.synopsys.com) |
| * |
| * This program is dual-licensed; you may select either version 2 of |
| * the GNU General Public License ("GPL") or BSD license ("BSD"). |
| * |
| * This Synopsys DWC XLGMAC software driver and associated documentation |
| * (hereinafter the "Software") is an unsupported proprietary work of |
| * Synopsys, Inc. unless otherwise expressly agreed to in writing between |
| * Synopsys and you. The Software IS NOT an item of Licensed Software or a |
| * Licensed Product under any End User Software License Agreement or |
| * Agreement for Licensed Products with Synopsys or any supplement thereto. |
| * Synopsys is a registered trademark of Synopsys, Inc. Other names included |
| * in the SOFTWARE may be the trademarks of their respective owners. |
| */ |
| |
| #include <linux/netdevice.h> |
| #include <linux/tcp.h> |
| #include <linux/interrupt.h> |
| |
| #include "dwc-xlgmac.h" |
| #include "dwc-xlgmac-reg.h" |
| |
| static int xlgmac_one_poll(struct napi_struct *, int); |
| static int xlgmac_all_poll(struct napi_struct *, int); |
| |
| static inline unsigned int xlgmac_tx_avail_desc(struct xlgmac_ring *ring) |
| { |
| return (ring->dma_desc_count - (ring->cur - ring->dirty)); |
| } |
| |
| static inline unsigned int xlgmac_rx_dirty_desc(struct xlgmac_ring *ring) |
| { |
| return (ring->cur - ring->dirty); |
| } |
| |
| static int xlgmac_maybe_stop_tx_queue( |
| struct xlgmac_channel *channel, |
| struct xlgmac_ring *ring, |
| unsigned int count) |
| { |
| struct xlgmac_pdata *pdata = channel->pdata; |
| |
| if (count > xlgmac_tx_avail_desc(ring)) { |
| netif_info(pdata, drv, pdata->netdev, |
| "Tx queue stopped, not enough descriptors available\n"); |
| netif_stop_subqueue(pdata->netdev, channel->queue_index); |
| ring->tx.queue_stopped = 1; |
| |
| /* If we haven't notified the hardware because of xmit_more |
| * support, tell it now |
| */ |
| if (ring->tx.xmit_more) |
| pdata->hw_ops.tx_start_xmit(channel, ring); |
| |
| return NETDEV_TX_BUSY; |
| } |
| |
| return 0; |
| } |
| |
| static void xlgmac_prep_vlan(struct sk_buff *skb, |
| struct xlgmac_pkt_info *pkt_info) |
| { |
| if (skb_vlan_tag_present(skb)) |
| pkt_info->vlan_ctag = skb_vlan_tag_get(skb); |
| } |
| |
| static int xlgmac_prep_tso(struct sk_buff *skb, |
| struct xlgmac_pkt_info *pkt_info) |
| { |
| int ret; |
| |
| if (!XLGMAC_GET_REG_BITS(pkt_info->attributes, |
| TX_PACKET_ATTRIBUTES_TSO_ENABLE_POS, |
| TX_PACKET_ATTRIBUTES_TSO_ENABLE_LEN)) |
| return 0; |
| |
| ret = skb_cow_head(skb, 0); |
| if (ret) |
| return ret; |
| |
| pkt_info->header_len = skb_transport_offset(skb) + tcp_hdrlen(skb); |
| pkt_info->tcp_header_len = tcp_hdrlen(skb); |
| pkt_info->tcp_payload_len = skb->len - pkt_info->header_len; |
| pkt_info->mss = skb_shinfo(skb)->gso_size; |
| |
| XLGMAC_PR("header_len=%u\n", pkt_info->header_len); |
| XLGMAC_PR("tcp_header_len=%u, tcp_payload_len=%u\n", |
| pkt_info->tcp_header_len, pkt_info->tcp_payload_len); |
| XLGMAC_PR("mss=%u\n", pkt_info->mss); |
| |
| /* Update the number of packets that will ultimately be transmitted |
| * along with the extra bytes for each extra packet |
| */ |
| pkt_info->tx_packets = skb_shinfo(skb)->gso_segs; |
| pkt_info->tx_bytes += (pkt_info->tx_packets - 1) * pkt_info->header_len; |
| |
| return 0; |
| } |
| |
| static int xlgmac_is_tso(struct sk_buff *skb) |
| { |
| if (skb->ip_summed != CHECKSUM_PARTIAL) |
| return 0; |
| |
| if (!skb_is_gso(skb)) |
| return 0; |
| |
| return 1; |
| } |
| |
| static void xlgmac_prep_tx_pkt(struct xlgmac_pdata *pdata, |
| struct xlgmac_ring *ring, |
| struct sk_buff *skb, |
| struct xlgmac_pkt_info *pkt_info) |
| { |
| skb_frag_t *frag; |
| unsigned int context_desc; |
| unsigned int len; |
| unsigned int i; |
| |
| pkt_info->skb = skb; |
| |
| context_desc = 0; |
| pkt_info->desc_count = 0; |
| |
| pkt_info->tx_packets = 1; |
| pkt_info->tx_bytes = skb->len; |
| |
| if (xlgmac_is_tso(skb)) { |
| /* TSO requires an extra descriptor if mss is different */ |
| if (skb_shinfo(skb)->gso_size != ring->tx.cur_mss) { |
| context_desc = 1; |
| pkt_info->desc_count++; |
| } |
| |
| /* TSO requires an extra descriptor for TSO header */ |
| pkt_info->desc_count++; |
| |
| pkt_info->attributes = XLGMAC_SET_REG_BITS( |
| pkt_info->attributes, |
| TX_PACKET_ATTRIBUTES_TSO_ENABLE_POS, |
| TX_PACKET_ATTRIBUTES_TSO_ENABLE_LEN, |
| 1); |
| pkt_info->attributes = XLGMAC_SET_REG_BITS( |
| pkt_info->attributes, |
| TX_PACKET_ATTRIBUTES_CSUM_ENABLE_POS, |
| TX_PACKET_ATTRIBUTES_CSUM_ENABLE_LEN, |
| 1); |
| } else if (skb->ip_summed == CHECKSUM_PARTIAL) |
| pkt_info->attributes = XLGMAC_SET_REG_BITS( |
| pkt_info->attributes, |
| TX_PACKET_ATTRIBUTES_CSUM_ENABLE_POS, |
| TX_PACKET_ATTRIBUTES_CSUM_ENABLE_LEN, |
| 1); |
| |
| if (skb_vlan_tag_present(skb)) { |
| /* VLAN requires an extra descriptor if tag is different */ |
| if (skb_vlan_tag_get(skb) != ring->tx.cur_vlan_ctag) |
| /* We can share with the TSO context descriptor */ |
| if (!context_desc) { |
| context_desc = 1; |
| pkt_info->desc_count++; |
| } |
| |
| pkt_info->attributes = XLGMAC_SET_REG_BITS( |
| pkt_info->attributes, |
| TX_PACKET_ATTRIBUTES_VLAN_CTAG_POS, |
| TX_PACKET_ATTRIBUTES_VLAN_CTAG_LEN, |
| 1); |
| } |
| |
| for (len = skb_headlen(skb); len;) { |
| pkt_info->desc_count++; |
| len -= min_t(unsigned int, len, XLGMAC_TX_MAX_BUF_SIZE); |
| } |
| |
| for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
| frag = &skb_shinfo(skb)->frags[i]; |
| for (len = skb_frag_size(frag); len; ) { |
| pkt_info->desc_count++; |
| len -= min_t(unsigned int, len, XLGMAC_TX_MAX_BUF_SIZE); |
| } |
| } |
| } |
| |
| static int xlgmac_calc_rx_buf_size(struct net_device *netdev, unsigned int mtu) |
| { |
| unsigned int rx_buf_size; |
| |
| if (mtu > XLGMAC_JUMBO_PACKET_MTU) { |
| netdev_alert(netdev, "MTU exceeds maximum supported value\n"); |
| return -EINVAL; |
| } |
| |
| rx_buf_size = mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN; |
| rx_buf_size = clamp_val(rx_buf_size, XLGMAC_RX_MIN_BUF_SIZE, PAGE_SIZE); |
| |
| rx_buf_size = (rx_buf_size + XLGMAC_RX_BUF_ALIGN - 1) & |
| ~(XLGMAC_RX_BUF_ALIGN - 1); |
| |
| return rx_buf_size; |
| } |
| |
| static void xlgmac_enable_rx_tx_ints(struct xlgmac_pdata *pdata) |
| { |
| struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops; |
| struct xlgmac_channel *channel; |
| enum xlgmac_int int_id; |
| unsigned int i; |
| |
| channel = pdata->channel_head; |
| for (i = 0; i < pdata->channel_count; i++, channel++) { |
| if (channel->tx_ring && channel->rx_ring) |
| int_id = XLGMAC_INT_DMA_CH_SR_TI_RI; |
| else if (channel->tx_ring) |
| int_id = XLGMAC_INT_DMA_CH_SR_TI; |
| else if (channel->rx_ring) |
| int_id = XLGMAC_INT_DMA_CH_SR_RI; |
| else |
| continue; |
| |
| hw_ops->enable_int(channel, int_id); |
| } |
| } |
| |
| static void xlgmac_disable_rx_tx_ints(struct xlgmac_pdata *pdata) |
| { |
| struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops; |
| struct xlgmac_channel *channel; |
| enum xlgmac_int int_id; |
| unsigned int i; |
| |
| channel = pdata->channel_head; |
| for (i = 0; i < pdata->channel_count; i++, channel++) { |
| if (channel->tx_ring && channel->rx_ring) |
| int_id = XLGMAC_INT_DMA_CH_SR_TI_RI; |
| else if (channel->tx_ring) |
| int_id = XLGMAC_INT_DMA_CH_SR_TI; |
| else if (channel->rx_ring) |
| int_id = XLGMAC_INT_DMA_CH_SR_RI; |
| else |
| continue; |
| |
| hw_ops->disable_int(channel, int_id); |
| } |
| } |
| |
| static irqreturn_t xlgmac_isr(int irq, void *data) |
| { |
| unsigned int dma_isr, dma_ch_isr, mac_isr; |
| struct xlgmac_pdata *pdata = data; |
| struct xlgmac_channel *channel; |
| struct xlgmac_hw_ops *hw_ops; |
| unsigned int i, ti, ri; |
| |
| hw_ops = &pdata->hw_ops; |
| |
| /* The DMA interrupt status register also reports MAC and MTL |
| * interrupts. So for polling mode, we just need to check for |
| * this register to be non-zero |
| */ |
| dma_isr = readl(pdata->mac_regs + DMA_ISR); |
| if (!dma_isr) |
| return IRQ_HANDLED; |
| |
| netif_dbg(pdata, intr, pdata->netdev, "DMA_ISR=%#010x\n", dma_isr); |
| |
| for (i = 0; i < pdata->channel_count; i++) { |
| if (!(dma_isr & (1 << i))) |
| continue; |
| |
| channel = pdata->channel_head + i; |
| |
| dma_ch_isr = readl(XLGMAC_DMA_REG(channel, DMA_CH_SR)); |
| netif_dbg(pdata, intr, pdata->netdev, "DMA_CH%u_ISR=%#010x\n", |
| i, dma_ch_isr); |
| |
| /* The TI or RI interrupt bits may still be set even if using |
| * per channel DMA interrupts. Check to be sure those are not |
| * enabled before using the private data napi structure. |
| */ |
| ti = XLGMAC_GET_REG_BITS(dma_ch_isr, DMA_CH_SR_TI_POS, |
| DMA_CH_SR_TI_LEN); |
| ri = XLGMAC_GET_REG_BITS(dma_ch_isr, DMA_CH_SR_RI_POS, |
| DMA_CH_SR_RI_LEN); |
| if (!pdata->per_channel_irq && (ti || ri)) { |
| if (napi_schedule_prep(&pdata->napi)) { |
| /* Disable Tx and Rx interrupts */ |
| xlgmac_disable_rx_tx_ints(pdata); |
| |
| pdata->stats.napi_poll_isr++; |
| /* Turn on polling */ |
| __napi_schedule_irqoff(&pdata->napi); |
| } |
| } |
| |
| if (XLGMAC_GET_REG_BITS(dma_ch_isr, DMA_CH_SR_TPS_POS, |
| DMA_CH_SR_TPS_LEN)) |
| pdata->stats.tx_process_stopped++; |
| |
| if (XLGMAC_GET_REG_BITS(dma_ch_isr, DMA_CH_SR_RPS_POS, |
| DMA_CH_SR_RPS_LEN)) |
| pdata->stats.rx_process_stopped++; |
| |
| if (XLGMAC_GET_REG_BITS(dma_ch_isr, DMA_CH_SR_TBU_POS, |
| DMA_CH_SR_TBU_LEN)) |
| pdata->stats.tx_buffer_unavailable++; |
| |
| if (XLGMAC_GET_REG_BITS(dma_ch_isr, DMA_CH_SR_RBU_POS, |
| DMA_CH_SR_RBU_LEN)) |
| pdata->stats.rx_buffer_unavailable++; |
| |
| /* Restart the device on a Fatal Bus Error */ |
| if (XLGMAC_GET_REG_BITS(dma_ch_isr, DMA_CH_SR_FBE_POS, |
| DMA_CH_SR_FBE_LEN)) { |
| pdata->stats.fatal_bus_error++; |
| schedule_work(&pdata->restart_work); |
| } |
| |
| /* Clear all interrupt signals */ |
| writel(dma_ch_isr, XLGMAC_DMA_REG(channel, DMA_CH_SR)); |
| } |
| |
| if (XLGMAC_GET_REG_BITS(dma_isr, DMA_ISR_MACIS_POS, |
| DMA_ISR_MACIS_LEN)) { |
| mac_isr = readl(pdata->mac_regs + MAC_ISR); |
| |
| if (XLGMAC_GET_REG_BITS(mac_isr, MAC_ISR_MMCTXIS_POS, |
| MAC_ISR_MMCTXIS_LEN)) |
| hw_ops->tx_mmc_int(pdata); |
| |
| if (XLGMAC_GET_REG_BITS(mac_isr, MAC_ISR_MMCRXIS_POS, |
| MAC_ISR_MMCRXIS_LEN)) |
| hw_ops->rx_mmc_int(pdata); |
| } |
| |
| return IRQ_HANDLED; |
| } |
| |
| static irqreturn_t xlgmac_dma_isr(int irq, void *data) |
| { |
| struct xlgmac_channel *channel = data; |
| |
| /* Per channel DMA interrupts are enabled, so we use the per |
| * channel napi structure and not the private data napi structure |
| */ |
| if (napi_schedule_prep(&channel->napi)) { |
| /* Disable Tx and Rx interrupts */ |
| disable_irq_nosync(channel->dma_irq); |
| |
| /* Turn on polling */ |
| __napi_schedule_irqoff(&channel->napi); |
| } |
| |
| return IRQ_HANDLED; |
| } |
| |
| static void xlgmac_tx_timer(struct timer_list *t) |
| { |
| struct xlgmac_channel *channel = from_timer(channel, t, tx_timer); |
| struct xlgmac_pdata *pdata = channel->pdata; |
| struct napi_struct *napi; |
| |
| napi = (pdata->per_channel_irq) ? &channel->napi : &pdata->napi; |
| |
| if (napi_schedule_prep(napi)) { |
| /* Disable Tx and Rx interrupts */ |
| if (pdata->per_channel_irq) |
| disable_irq_nosync(channel->dma_irq); |
| else |
| xlgmac_disable_rx_tx_ints(pdata); |
| |
| pdata->stats.napi_poll_txtimer++; |
| /* Turn on polling */ |
| __napi_schedule(napi); |
| } |
| |
| channel->tx_timer_active = 0; |
| } |
| |
| static void xlgmac_init_timers(struct xlgmac_pdata *pdata) |
| { |
| struct xlgmac_channel *channel; |
| unsigned int i; |
| |
| channel = pdata->channel_head; |
| for (i = 0; i < pdata->channel_count; i++, channel++) { |
| if (!channel->tx_ring) |
| break; |
| |
| timer_setup(&channel->tx_timer, xlgmac_tx_timer, 0); |
| } |
| } |
| |
| static void xlgmac_stop_timers(struct xlgmac_pdata *pdata) |
| { |
| struct xlgmac_channel *channel; |
| unsigned int i; |
| |
| channel = pdata->channel_head; |
| for (i = 0; i < pdata->channel_count; i++, channel++) { |
| if (!channel->tx_ring) |
| break; |
| |
| del_timer_sync(&channel->tx_timer); |
| } |
| } |
| |
| static void xlgmac_napi_enable(struct xlgmac_pdata *pdata, unsigned int add) |
| { |
| struct xlgmac_channel *channel; |
| unsigned int i; |
| |
| if (pdata->per_channel_irq) { |
| channel = pdata->channel_head; |
| for (i = 0; i < pdata->channel_count; i++, channel++) { |
| if (add) |
| netif_napi_add(pdata->netdev, &channel->napi, |
| xlgmac_one_poll, |
| NAPI_POLL_WEIGHT); |
| |
| napi_enable(&channel->napi); |
| } |
| } else { |
| if (add) |
| netif_napi_add(pdata->netdev, &pdata->napi, |
| xlgmac_all_poll, NAPI_POLL_WEIGHT); |
| |
| napi_enable(&pdata->napi); |
| } |
| } |
| |
| static void xlgmac_napi_disable(struct xlgmac_pdata *pdata, unsigned int del) |
| { |
| struct xlgmac_channel *channel; |
| unsigned int i; |
| |
| if (pdata->per_channel_irq) { |
| channel = pdata->channel_head; |
| for (i = 0; i < pdata->channel_count; i++, channel++) { |
| napi_disable(&channel->napi); |
| |
| if (del) |
| netif_napi_del(&channel->napi); |
| } |
| } else { |
| napi_disable(&pdata->napi); |
| |
| if (del) |
| netif_napi_del(&pdata->napi); |
| } |
| } |
| |
| static int xlgmac_request_irqs(struct xlgmac_pdata *pdata) |
| { |
| struct net_device *netdev = pdata->netdev; |
| struct xlgmac_channel *channel; |
| unsigned int i; |
| int ret; |
| |
| ret = devm_request_irq(pdata->dev, pdata->dev_irq, xlgmac_isr, |
| IRQF_SHARED, netdev->name, pdata); |
| if (ret) { |
| netdev_alert(netdev, "error requesting irq %d\n", |
| pdata->dev_irq); |
| return ret; |
| } |
| |
| if (!pdata->per_channel_irq) |
| return 0; |
| |
| channel = pdata->channel_head; |
| for (i = 0; i < pdata->channel_count; i++, channel++) { |
| snprintf(channel->dma_irq_name, |
| sizeof(channel->dma_irq_name) - 1, |
| "%s-TxRx-%u", netdev_name(netdev), |
| channel->queue_index); |
| |
| ret = devm_request_irq(pdata->dev, channel->dma_irq, |
| xlgmac_dma_isr, 0, |
| channel->dma_irq_name, channel); |
| if (ret) { |
| netdev_alert(netdev, "error requesting irq %d\n", |
| channel->dma_irq); |
| goto err_irq; |
| } |
| } |
| |
| return 0; |
| |
| err_irq: |
| /* Using an unsigned int, 'i' will go to UINT_MAX and exit */ |
| for (i--, channel--; i < pdata->channel_count; i--, channel--) |
| devm_free_irq(pdata->dev, channel->dma_irq, channel); |
| |
| devm_free_irq(pdata->dev, pdata->dev_irq, pdata); |
| |
| return ret; |
| } |
| |
| static void xlgmac_free_irqs(struct xlgmac_pdata *pdata) |
| { |
| struct xlgmac_channel *channel; |
| unsigned int i; |
| |
| devm_free_irq(pdata->dev, pdata->dev_irq, pdata); |
| |
| if (!pdata->per_channel_irq) |
| return; |
| |
| channel = pdata->channel_head; |
| for (i = 0; i < pdata->channel_count; i++, channel++) |
| devm_free_irq(pdata->dev, channel->dma_irq, channel); |
| } |
| |
| static void xlgmac_free_tx_data(struct xlgmac_pdata *pdata) |
| { |
| struct xlgmac_desc_ops *desc_ops = &pdata->desc_ops; |
| struct xlgmac_desc_data *desc_data; |
| struct xlgmac_channel *channel; |
| struct xlgmac_ring *ring; |
| unsigned int i, j; |
| |
| channel = pdata->channel_head; |
| for (i = 0; i < pdata->channel_count; i++, channel++) { |
| ring = channel->tx_ring; |
| if (!ring) |
| break; |
| |
| for (j = 0; j < ring->dma_desc_count; j++) { |
| desc_data = XLGMAC_GET_DESC_DATA(ring, j); |
| desc_ops->unmap_desc_data(pdata, desc_data); |
| } |
| } |
| } |
| |
| static void xlgmac_free_rx_data(struct xlgmac_pdata *pdata) |
| { |
| struct xlgmac_desc_ops *desc_ops = &pdata->desc_ops; |
| struct xlgmac_desc_data *desc_data; |
| struct xlgmac_channel *channel; |
| struct xlgmac_ring *ring; |
| unsigned int i, j; |
| |
| channel = pdata->channel_head; |
| for (i = 0; i < pdata->channel_count; i++, channel++) { |
| ring = channel->rx_ring; |
| if (!ring) |
| break; |
| |
| for (j = 0; j < ring->dma_desc_count; j++) { |
| desc_data = XLGMAC_GET_DESC_DATA(ring, j); |
| desc_ops->unmap_desc_data(pdata, desc_data); |
| } |
| } |
| } |
| |
| static int xlgmac_start(struct xlgmac_pdata *pdata) |
| { |
| struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops; |
| struct net_device *netdev = pdata->netdev; |
| int ret; |
| |
| hw_ops->init(pdata); |
| xlgmac_napi_enable(pdata, 1); |
| |
| ret = xlgmac_request_irqs(pdata); |
| if (ret) |
| goto err_napi; |
| |
| hw_ops->enable_tx(pdata); |
| hw_ops->enable_rx(pdata); |
| netif_tx_start_all_queues(netdev); |
| |
| return 0; |
| |
| err_napi: |
| xlgmac_napi_disable(pdata, 1); |
| hw_ops->exit(pdata); |
| |
| return ret; |
| } |
| |
| static void xlgmac_stop(struct xlgmac_pdata *pdata) |
| { |
| struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops; |
| struct net_device *netdev = pdata->netdev; |
| struct xlgmac_channel *channel; |
| struct netdev_queue *txq; |
| unsigned int i; |
| |
| netif_tx_stop_all_queues(netdev); |
| xlgmac_stop_timers(pdata); |
| hw_ops->disable_tx(pdata); |
| hw_ops->disable_rx(pdata); |
| xlgmac_free_irqs(pdata); |
| xlgmac_napi_disable(pdata, 1); |
| hw_ops->exit(pdata); |
| |
| channel = pdata->channel_head; |
| for (i = 0; i < pdata->channel_count; i++, channel++) { |
| if (!channel->tx_ring) |
| continue; |
| |
| txq = netdev_get_tx_queue(netdev, channel->queue_index); |
| netdev_tx_reset_queue(txq); |
| } |
| } |
| |
| static void xlgmac_restart_dev(struct xlgmac_pdata *pdata) |
| { |
| /* If not running, "restart" will happen on open */ |
| if (!netif_running(pdata->netdev)) |
| return; |
| |
| xlgmac_stop(pdata); |
| |
| xlgmac_free_tx_data(pdata); |
| xlgmac_free_rx_data(pdata); |
| |
| xlgmac_start(pdata); |
| } |
| |
| static void xlgmac_restart(struct work_struct *work) |
| { |
| struct xlgmac_pdata *pdata = container_of(work, |
| struct xlgmac_pdata, |
| restart_work); |
| |
| rtnl_lock(); |
| |
| xlgmac_restart_dev(pdata); |
| |
| rtnl_unlock(); |
| } |
| |
| static int xlgmac_open(struct net_device *netdev) |
| { |
| struct xlgmac_pdata *pdata = netdev_priv(netdev); |
| struct xlgmac_desc_ops *desc_ops; |
| int ret; |
| |
| desc_ops = &pdata->desc_ops; |
| |
| /* TODO: Initialize the phy */ |
| |
| /* Calculate the Rx buffer size before allocating rings */ |
| ret = xlgmac_calc_rx_buf_size(netdev, netdev->mtu); |
| if (ret < 0) |
| return ret; |
| pdata->rx_buf_size = ret; |
| |
| /* Allocate the channels and rings */ |
| ret = desc_ops->alloc_channels_and_rings(pdata); |
| if (ret) |
| return ret; |
| |
| INIT_WORK(&pdata->restart_work, xlgmac_restart); |
| xlgmac_init_timers(pdata); |
| |
| ret = xlgmac_start(pdata); |
| if (ret) |
| goto err_channels_and_rings; |
| |
| return 0; |
| |
| err_channels_and_rings: |
| desc_ops->free_channels_and_rings(pdata); |
| |
| return ret; |
| } |
| |
| static int xlgmac_close(struct net_device *netdev) |
| { |
| struct xlgmac_pdata *pdata = netdev_priv(netdev); |
| struct xlgmac_desc_ops *desc_ops; |
| |
| desc_ops = &pdata->desc_ops; |
| |
| /* Stop the device */ |
| xlgmac_stop(pdata); |
| |
| /* Free the channels and rings */ |
| desc_ops->free_channels_and_rings(pdata); |
| |
| return 0; |
| } |
| |
| static void xlgmac_tx_timeout(struct net_device *netdev, unsigned int txqueue) |
| { |
| struct xlgmac_pdata *pdata = netdev_priv(netdev); |
| |
| netdev_warn(netdev, "tx timeout, device restarting\n"); |
| schedule_work(&pdata->restart_work); |
| } |
| |
| static netdev_tx_t xlgmac_xmit(struct sk_buff *skb, struct net_device *netdev) |
| { |
| struct xlgmac_pdata *pdata = netdev_priv(netdev); |
| struct xlgmac_pkt_info *tx_pkt_info; |
| struct xlgmac_desc_ops *desc_ops; |
| struct xlgmac_channel *channel; |
| struct xlgmac_hw_ops *hw_ops; |
| struct netdev_queue *txq; |
| struct xlgmac_ring *ring; |
| int ret; |
| |
| desc_ops = &pdata->desc_ops; |
| hw_ops = &pdata->hw_ops; |
| |
| XLGMAC_PR("skb->len = %d\n", skb->len); |
| |
| channel = pdata->channel_head + skb->queue_mapping; |
| txq = netdev_get_tx_queue(netdev, channel->queue_index); |
| ring = channel->tx_ring; |
| tx_pkt_info = &ring->pkt_info; |
| |
| if (skb->len == 0) { |
| netif_err(pdata, tx_err, netdev, |
| "empty skb received from stack\n"); |
| dev_kfree_skb_any(skb); |
| return NETDEV_TX_OK; |
| } |
| |
| /* Prepare preliminary packet info for TX */ |
| memset(tx_pkt_info, 0, sizeof(*tx_pkt_info)); |
| xlgmac_prep_tx_pkt(pdata, ring, skb, tx_pkt_info); |
| |
| /* Check that there are enough descriptors available */ |
| ret = xlgmac_maybe_stop_tx_queue(channel, ring, |
| tx_pkt_info->desc_count); |
| if (ret) |
| return ret; |
| |
| ret = xlgmac_prep_tso(skb, tx_pkt_info); |
| if (ret) { |
| netif_err(pdata, tx_err, netdev, |
| "error processing TSO packet\n"); |
| dev_kfree_skb_any(skb); |
| return ret; |
| } |
| xlgmac_prep_vlan(skb, tx_pkt_info); |
| |
| if (!desc_ops->map_tx_skb(channel, skb)) { |
| dev_kfree_skb_any(skb); |
| return NETDEV_TX_OK; |
| } |
| |
| /* Report on the actual number of bytes (to be) sent */ |
| netdev_tx_sent_queue(txq, tx_pkt_info->tx_bytes); |
| |
| /* Configure required descriptor fields for transmission */ |
| hw_ops->dev_xmit(channel); |
| |
| if (netif_msg_pktdata(pdata)) |
| xlgmac_print_pkt(netdev, skb, true); |
| |
| /* Stop the queue in advance if there may not be enough descriptors */ |
| xlgmac_maybe_stop_tx_queue(channel, ring, XLGMAC_TX_MAX_DESC_NR); |
| |
| return NETDEV_TX_OK; |
| } |
| |
| static void xlgmac_get_stats64(struct net_device *netdev, |
| struct rtnl_link_stats64 *s) |
| { |
| struct xlgmac_pdata *pdata = netdev_priv(netdev); |
| struct xlgmac_stats *pstats = &pdata->stats; |
| |
| pdata->hw_ops.read_mmc_stats(pdata); |
| |
| s->rx_packets = pstats->rxframecount_gb; |
| s->rx_bytes = pstats->rxoctetcount_gb; |
| s->rx_errors = pstats->rxframecount_gb - |
| pstats->rxbroadcastframes_g - |
| pstats->rxmulticastframes_g - |
| pstats->rxunicastframes_g; |
| s->multicast = pstats->rxmulticastframes_g; |
| s->rx_length_errors = pstats->rxlengtherror; |
| s->rx_crc_errors = pstats->rxcrcerror; |
| s->rx_fifo_errors = pstats->rxfifooverflow; |
| |
| s->tx_packets = pstats->txframecount_gb; |
| s->tx_bytes = pstats->txoctetcount_gb; |
| s->tx_errors = pstats->txframecount_gb - pstats->txframecount_g; |
| s->tx_dropped = netdev->stats.tx_dropped; |
| } |
| |
| static int xlgmac_set_mac_address(struct net_device *netdev, void *addr) |
| { |
| struct xlgmac_pdata *pdata = netdev_priv(netdev); |
| struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops; |
| struct sockaddr *saddr = addr; |
| |
| if (!is_valid_ether_addr(saddr->sa_data)) |
| return -EADDRNOTAVAIL; |
| |
| eth_hw_addr_set(netdev, saddr->sa_data); |
| |
| hw_ops->set_mac_address(pdata, netdev->dev_addr); |
| |
| return 0; |
| } |
| |
| static int xlgmac_ioctl(struct net_device *netdev, |
| struct ifreq *ifreq, int cmd) |
| { |
| if (!netif_running(netdev)) |
| return -ENODEV; |
| |
| return 0; |
| } |
| |
| static int xlgmac_change_mtu(struct net_device *netdev, int mtu) |
| { |
| struct xlgmac_pdata *pdata = netdev_priv(netdev); |
| int ret; |
| |
| ret = xlgmac_calc_rx_buf_size(netdev, mtu); |
| if (ret < 0) |
| return ret; |
| |
| pdata->rx_buf_size = ret; |
| netdev->mtu = mtu; |
| |
| xlgmac_restart_dev(pdata); |
| |
| return 0; |
| } |
| |
| static int xlgmac_vlan_rx_add_vid(struct net_device *netdev, |
| __be16 proto, |
| u16 vid) |
| { |
| struct xlgmac_pdata *pdata = netdev_priv(netdev); |
| struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops; |
| |
| set_bit(vid, pdata->active_vlans); |
| hw_ops->update_vlan_hash_table(pdata); |
| |
| return 0; |
| } |
| |
| static int xlgmac_vlan_rx_kill_vid(struct net_device *netdev, |
| __be16 proto, |
| u16 vid) |
| { |
| struct xlgmac_pdata *pdata = netdev_priv(netdev); |
| struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops; |
| |
| clear_bit(vid, pdata->active_vlans); |
| hw_ops->update_vlan_hash_table(pdata); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_NET_POLL_CONTROLLER |
| static void xlgmac_poll_controller(struct net_device *netdev) |
| { |
| struct xlgmac_pdata *pdata = netdev_priv(netdev); |
| struct xlgmac_channel *channel; |
| unsigned int i; |
| |
| if (pdata->per_channel_irq) { |
| channel = pdata->channel_head; |
| for (i = 0; i < pdata->channel_count; i++, channel++) |
| xlgmac_dma_isr(channel->dma_irq, channel); |
| } else { |
| disable_irq(pdata->dev_irq); |
| xlgmac_isr(pdata->dev_irq, pdata); |
| enable_irq(pdata->dev_irq); |
| } |
| } |
| #endif /* CONFIG_NET_POLL_CONTROLLER */ |
| |
| static int xlgmac_set_features(struct net_device *netdev, |
| netdev_features_t features) |
| { |
| netdev_features_t rxhash, rxcsum, rxvlan, rxvlan_filter; |
| struct xlgmac_pdata *pdata = netdev_priv(netdev); |
| struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops; |
| int ret = 0; |
| |
| rxhash = pdata->netdev_features & NETIF_F_RXHASH; |
| rxcsum = pdata->netdev_features & NETIF_F_RXCSUM; |
| rxvlan = pdata->netdev_features & NETIF_F_HW_VLAN_CTAG_RX; |
| rxvlan_filter = pdata->netdev_features & NETIF_F_HW_VLAN_CTAG_FILTER; |
| |
| if ((features & NETIF_F_RXHASH) && !rxhash) |
| ret = hw_ops->enable_rss(pdata); |
| else if (!(features & NETIF_F_RXHASH) && rxhash) |
| ret = hw_ops->disable_rss(pdata); |
| if (ret) |
| return ret; |
| |
| if ((features & NETIF_F_RXCSUM) && !rxcsum) |
| hw_ops->enable_rx_csum(pdata); |
| else if (!(features & NETIF_F_RXCSUM) && rxcsum) |
| hw_ops->disable_rx_csum(pdata); |
| |
| if ((features & NETIF_F_HW_VLAN_CTAG_RX) && !rxvlan) |
| hw_ops->enable_rx_vlan_stripping(pdata); |
| else if (!(features & NETIF_F_HW_VLAN_CTAG_RX) && rxvlan) |
| hw_ops->disable_rx_vlan_stripping(pdata); |
| |
| if ((features & NETIF_F_HW_VLAN_CTAG_FILTER) && !rxvlan_filter) |
| hw_ops->enable_rx_vlan_filtering(pdata); |
| else if (!(features & NETIF_F_HW_VLAN_CTAG_FILTER) && rxvlan_filter) |
| hw_ops->disable_rx_vlan_filtering(pdata); |
| |
| pdata->netdev_features = features; |
| |
| return 0; |
| } |
| |
| static void xlgmac_set_rx_mode(struct net_device *netdev) |
| { |
| struct xlgmac_pdata *pdata = netdev_priv(netdev); |
| struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops; |
| |
| hw_ops->config_rx_mode(pdata); |
| } |
| |
| static const struct net_device_ops xlgmac_netdev_ops = { |
| .ndo_open = xlgmac_open, |
| .ndo_stop = xlgmac_close, |
| .ndo_start_xmit = xlgmac_xmit, |
| .ndo_tx_timeout = xlgmac_tx_timeout, |
| .ndo_get_stats64 = xlgmac_get_stats64, |
| .ndo_change_mtu = xlgmac_change_mtu, |
| .ndo_set_mac_address = xlgmac_set_mac_address, |
| .ndo_validate_addr = eth_validate_addr, |
| .ndo_eth_ioctl = xlgmac_ioctl, |
| .ndo_vlan_rx_add_vid = xlgmac_vlan_rx_add_vid, |
| .ndo_vlan_rx_kill_vid = xlgmac_vlan_rx_kill_vid, |
| #ifdef CONFIG_NET_POLL_CONTROLLER |
| .ndo_poll_controller = xlgmac_poll_controller, |
| #endif |
| .ndo_set_features = xlgmac_set_features, |
| .ndo_set_rx_mode = xlgmac_set_rx_mode, |
| }; |
| |
| const struct net_device_ops *xlgmac_get_netdev_ops(void) |
| { |
| return &xlgmac_netdev_ops; |
| } |
| |
| static void xlgmac_rx_refresh(struct xlgmac_channel *channel) |
| { |
| struct xlgmac_pdata *pdata = channel->pdata; |
| struct xlgmac_ring *ring = channel->rx_ring; |
| struct xlgmac_desc_data *desc_data; |
| struct xlgmac_desc_ops *desc_ops; |
| struct xlgmac_hw_ops *hw_ops; |
| |
| desc_ops = &pdata->desc_ops; |
| hw_ops = &pdata->hw_ops; |
| |
| while (ring->dirty != ring->cur) { |
| desc_data = XLGMAC_GET_DESC_DATA(ring, ring->dirty); |
| |
| /* Reset desc_data values */ |
| desc_ops->unmap_desc_data(pdata, desc_data); |
| |
| if (desc_ops->map_rx_buffer(pdata, ring, desc_data)) |
| break; |
| |
| hw_ops->rx_desc_reset(pdata, desc_data, ring->dirty); |
| |
| ring->dirty++; |
| } |
| |
| /* Make sure everything is written before the register write */ |
| wmb(); |
| |
| /* Update the Rx Tail Pointer Register with address of |
| * the last cleaned entry |
| */ |
| desc_data = XLGMAC_GET_DESC_DATA(ring, ring->dirty - 1); |
| writel(lower_32_bits(desc_data->dma_desc_addr), |
| XLGMAC_DMA_REG(channel, DMA_CH_RDTR_LO)); |
| } |
| |
| static struct sk_buff *xlgmac_create_skb(struct xlgmac_pdata *pdata, |
| struct napi_struct *napi, |
| struct xlgmac_desc_data *desc_data, |
| unsigned int len) |
| { |
| unsigned int copy_len; |
| struct sk_buff *skb; |
| u8 *packet; |
| |
| skb = napi_alloc_skb(napi, desc_data->rx.hdr.dma_len); |
| if (!skb) |
| return NULL; |
| |
| /* Start with the header buffer which may contain just the header |
| * or the header plus data |
| */ |
| dma_sync_single_range_for_cpu(pdata->dev, desc_data->rx.hdr.dma_base, |
| desc_data->rx.hdr.dma_off, |
| desc_data->rx.hdr.dma_len, |
| DMA_FROM_DEVICE); |
| |
| packet = page_address(desc_data->rx.hdr.pa.pages) + |
| desc_data->rx.hdr.pa.pages_offset; |
| copy_len = (desc_data->rx.hdr_len) ? desc_data->rx.hdr_len : len; |
| copy_len = min(desc_data->rx.hdr.dma_len, copy_len); |
| skb_copy_to_linear_data(skb, packet, copy_len); |
| skb_put(skb, copy_len); |
| |
| len -= copy_len; |
| if (len) { |
| /* Add the remaining data as a frag */ |
| dma_sync_single_range_for_cpu(pdata->dev, |
| desc_data->rx.buf.dma_base, |
| desc_data->rx.buf.dma_off, |
| desc_data->rx.buf.dma_len, |
| DMA_FROM_DEVICE); |
| |
| skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, |
| desc_data->rx.buf.pa.pages, |
| desc_data->rx.buf.pa.pages_offset, |
| len, desc_data->rx.buf.dma_len); |
| desc_data->rx.buf.pa.pages = NULL; |
| } |
| |
| return skb; |
| } |
| |
| static int xlgmac_tx_poll(struct xlgmac_channel *channel) |
| { |
| struct xlgmac_pdata *pdata = channel->pdata; |
| struct xlgmac_ring *ring = channel->tx_ring; |
| struct net_device *netdev = pdata->netdev; |
| unsigned int tx_packets = 0, tx_bytes = 0; |
| struct xlgmac_desc_data *desc_data; |
| struct xlgmac_dma_desc *dma_desc; |
| struct xlgmac_desc_ops *desc_ops; |
| struct xlgmac_hw_ops *hw_ops; |
| struct netdev_queue *txq; |
| int processed = 0; |
| unsigned int cur; |
| |
| desc_ops = &pdata->desc_ops; |
| hw_ops = &pdata->hw_ops; |
| |
| /* Nothing to do if there isn't a Tx ring for this channel */ |
| if (!ring) |
| return 0; |
| |
| cur = ring->cur; |
| |
| /* Be sure we get ring->cur before accessing descriptor data */ |
| smp_rmb(); |
| |
| txq = netdev_get_tx_queue(netdev, channel->queue_index); |
| |
| while ((processed < XLGMAC_TX_DESC_MAX_PROC) && |
| (ring->dirty != cur)) { |
| desc_data = XLGMAC_GET_DESC_DATA(ring, ring->dirty); |
| dma_desc = desc_data->dma_desc; |
| |
| if (!hw_ops->tx_complete(dma_desc)) |
| break; |
| |
| /* Make sure descriptor fields are read after reading |
| * the OWN bit |
| */ |
| dma_rmb(); |
| |
| if (netif_msg_tx_done(pdata)) |
| xlgmac_dump_tx_desc(pdata, ring, ring->dirty, 1, 0); |
| |
| if (hw_ops->is_last_desc(dma_desc)) { |
| tx_packets += desc_data->tx.packets; |
| tx_bytes += desc_data->tx.bytes; |
| } |
| |
| /* Free the SKB and reset the descriptor for re-use */ |
| desc_ops->unmap_desc_data(pdata, desc_data); |
| hw_ops->tx_desc_reset(desc_data); |
| |
| processed++; |
| ring->dirty++; |
| } |
| |
| if (!processed) |
| return 0; |
| |
| netdev_tx_completed_queue(txq, tx_packets, tx_bytes); |
| |
| if ((ring->tx.queue_stopped == 1) && |
| (xlgmac_tx_avail_desc(ring) > XLGMAC_TX_DESC_MIN_FREE)) { |
| ring->tx.queue_stopped = 0; |
| netif_tx_wake_queue(txq); |
| } |
| |
| XLGMAC_PR("processed=%d\n", processed); |
| |
| return processed; |
| } |
| |
| static int xlgmac_rx_poll(struct xlgmac_channel *channel, int budget) |
| { |
| struct xlgmac_pdata *pdata = channel->pdata; |
| struct xlgmac_ring *ring = channel->rx_ring; |
| struct net_device *netdev = pdata->netdev; |
| unsigned int len, dma_desc_len, max_len; |
| unsigned int context_next, context; |
| struct xlgmac_desc_data *desc_data; |
| struct xlgmac_pkt_info *pkt_info; |
| unsigned int incomplete, error; |
| struct xlgmac_hw_ops *hw_ops; |
| unsigned int received = 0; |
| struct napi_struct *napi; |
| struct sk_buff *skb; |
| int packet_count = 0; |
| |
| hw_ops = &pdata->hw_ops; |
| |
| /* Nothing to do if there isn't a Rx ring for this channel */ |
| if (!ring) |
| return 0; |
| |
| incomplete = 0; |
| context_next = 0; |
| |
| napi = (pdata->per_channel_irq) ? &channel->napi : &pdata->napi; |
| |
| desc_data = XLGMAC_GET_DESC_DATA(ring, ring->cur); |
| pkt_info = &ring->pkt_info; |
| while (packet_count < budget) { |
| /* First time in loop see if we need to restore state */ |
| if (!received && desc_data->state_saved) { |
| skb = desc_data->state.skb; |
| error = desc_data->state.error; |
| len = desc_data->state.len; |
| } else { |
| memset(pkt_info, 0, sizeof(*pkt_info)); |
| skb = NULL; |
| error = 0; |
| len = 0; |
| } |
| |
| read_again: |
| desc_data = XLGMAC_GET_DESC_DATA(ring, ring->cur); |
| |
| if (xlgmac_rx_dirty_desc(ring) > XLGMAC_RX_DESC_MAX_DIRTY) |
| xlgmac_rx_refresh(channel); |
| |
| if (hw_ops->dev_read(channel)) |
| break; |
| |
| received++; |
| ring->cur++; |
| |
| incomplete = XLGMAC_GET_REG_BITS( |
| pkt_info->attributes, |
| RX_PACKET_ATTRIBUTES_INCOMPLETE_POS, |
| RX_PACKET_ATTRIBUTES_INCOMPLETE_LEN); |
| context_next = XLGMAC_GET_REG_BITS( |
| pkt_info->attributes, |
| RX_PACKET_ATTRIBUTES_CONTEXT_NEXT_POS, |
| RX_PACKET_ATTRIBUTES_CONTEXT_NEXT_LEN); |
| context = XLGMAC_GET_REG_BITS( |
| pkt_info->attributes, |
| RX_PACKET_ATTRIBUTES_CONTEXT_POS, |
| RX_PACKET_ATTRIBUTES_CONTEXT_LEN); |
| |
| /* Earlier error, just drain the remaining data */ |
| if ((incomplete || context_next) && error) |
| goto read_again; |
| |
| if (error || pkt_info->errors) { |
| if (pkt_info->errors) |
| netif_err(pdata, rx_err, netdev, |
| "error in received packet\n"); |
| dev_kfree_skb(skb); |
| goto next_packet; |
| } |
| |
| if (!context) { |
| /* Length is cumulative, get this descriptor's length */ |
| dma_desc_len = desc_data->rx.len - len; |
| len += dma_desc_len; |
| |
| if (dma_desc_len && !skb) { |
| skb = xlgmac_create_skb(pdata, napi, desc_data, |
| dma_desc_len); |
| if (!skb) |
| error = 1; |
| } else if (dma_desc_len) { |
| dma_sync_single_range_for_cpu( |
| pdata->dev, |
| desc_data->rx.buf.dma_base, |
| desc_data->rx.buf.dma_off, |
| desc_data->rx.buf.dma_len, |
| DMA_FROM_DEVICE); |
| |
| skb_add_rx_frag( |
| skb, skb_shinfo(skb)->nr_frags, |
| desc_data->rx.buf.pa.pages, |
| desc_data->rx.buf.pa.pages_offset, |
| dma_desc_len, |
| desc_data->rx.buf.dma_len); |
| desc_data->rx.buf.pa.pages = NULL; |
| } |
| } |
| |
| if (incomplete || context_next) |
| goto read_again; |
| |
| if (!skb) |
| goto next_packet; |
| |
| /* Be sure we don't exceed the configured MTU */ |
| max_len = netdev->mtu + ETH_HLEN; |
| if (!(netdev->features & NETIF_F_HW_VLAN_CTAG_RX) && |
| (skb->protocol == htons(ETH_P_8021Q))) |
| max_len += VLAN_HLEN; |
| |
| if (skb->len > max_len) { |
| netif_err(pdata, rx_err, netdev, |
| "packet length exceeds configured MTU\n"); |
| dev_kfree_skb(skb); |
| goto next_packet; |
| } |
| |
| if (netif_msg_pktdata(pdata)) |
| xlgmac_print_pkt(netdev, skb, false); |
| |
| skb_checksum_none_assert(skb); |
| if (XLGMAC_GET_REG_BITS(pkt_info->attributes, |
| RX_PACKET_ATTRIBUTES_CSUM_DONE_POS, |
| RX_PACKET_ATTRIBUTES_CSUM_DONE_LEN)) |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| |
| if (XLGMAC_GET_REG_BITS(pkt_info->attributes, |
| RX_PACKET_ATTRIBUTES_VLAN_CTAG_POS, |
| RX_PACKET_ATTRIBUTES_VLAN_CTAG_LEN)) { |
| __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), |
| pkt_info->vlan_ctag); |
| pdata->stats.rx_vlan_packets++; |
| } |
| |
| if (XLGMAC_GET_REG_BITS(pkt_info->attributes, |
| RX_PACKET_ATTRIBUTES_RSS_HASH_POS, |
| RX_PACKET_ATTRIBUTES_RSS_HASH_LEN)) |
| skb_set_hash(skb, pkt_info->rss_hash, |
| pkt_info->rss_hash_type); |
| |
| skb->dev = netdev; |
| skb->protocol = eth_type_trans(skb, netdev); |
| skb_record_rx_queue(skb, channel->queue_index); |
| |
| napi_gro_receive(napi, skb); |
| |
| next_packet: |
| packet_count++; |
| } |
| |
| /* Check if we need to save state before leaving */ |
| if (received && (incomplete || context_next)) { |
| desc_data = XLGMAC_GET_DESC_DATA(ring, ring->cur); |
| desc_data->state_saved = 1; |
| desc_data->state.skb = skb; |
| desc_data->state.len = len; |
| desc_data->state.error = error; |
| } |
| |
| XLGMAC_PR("packet_count = %d\n", packet_count); |
| |
| return packet_count; |
| } |
| |
| static int xlgmac_one_poll(struct napi_struct *napi, int budget) |
| { |
| struct xlgmac_channel *channel = container_of(napi, |
| struct xlgmac_channel, |
| napi); |
| int processed = 0; |
| |
| XLGMAC_PR("budget=%d\n", budget); |
| |
| /* Cleanup Tx ring first */ |
| xlgmac_tx_poll(channel); |
| |
| /* Process Rx ring next */ |
| processed = xlgmac_rx_poll(channel, budget); |
| |
| /* If we processed everything, we are done */ |
| if (processed < budget) { |
| /* Turn off polling */ |
| napi_complete_done(napi, processed); |
| |
| /* Enable Tx and Rx interrupts */ |
| enable_irq(channel->dma_irq); |
| } |
| |
| XLGMAC_PR("received = %d\n", processed); |
| |
| return processed; |
| } |
| |
| static int xlgmac_all_poll(struct napi_struct *napi, int budget) |
| { |
| struct xlgmac_pdata *pdata = container_of(napi, |
| struct xlgmac_pdata, |
| napi); |
| struct xlgmac_channel *channel; |
| int processed, last_processed; |
| int ring_budget; |
| unsigned int i; |
| |
| XLGMAC_PR("budget=%d\n", budget); |
| |
| processed = 0; |
| ring_budget = budget / pdata->rx_ring_count; |
| do { |
| last_processed = processed; |
| |
| channel = pdata->channel_head; |
| for (i = 0; i < pdata->channel_count; i++, channel++) { |
| /* Cleanup Tx ring first */ |
| xlgmac_tx_poll(channel); |
| |
| /* Process Rx ring next */ |
| if (ring_budget > (budget - processed)) |
| ring_budget = budget - processed; |
| processed += xlgmac_rx_poll(channel, ring_budget); |
| } |
| } while ((processed < budget) && (processed != last_processed)); |
| |
| /* If we processed everything, we are done */ |
| if (processed < budget) { |
| /* Turn off polling */ |
| napi_complete_done(napi, processed); |
| |
| /* Enable Tx and Rx interrupts */ |
| xlgmac_enable_rx_tx_ints(pdata); |
| } |
| |
| XLGMAC_PR("received = %d\n", processed); |
| |
| return processed; |
| } |
