Hi,
some remarks below.
> +/* Fill up receive queue's RFD with preallocated receive buffers */
> +static void emac_mac_rx_descs_refill(struct emac_adapter *adpt,
> + struct emac_rx_queue *rx_q)
> +{
> + struct emac_buffer *curr_rxbuf;
> + struct emac_buffer *next_rxbuf;
> + unsigned int count = 0;
> + u32 next_produce_idx;
> +
> + next_produce_idx = rx_q->rfd.produce_idx + 1;
> + if (next_produce_idx == rx_q->rfd.count)
> + next_produce_idx = 0;
> +
> + curr_rxbuf = GET_RFD_BUFFER(rx_q, rx_q->rfd.produce_idx);
> + next_rxbuf = GET_RFD_BUFFER(rx_q, next_produce_idx);
> +
> + /* this always has a blank rx_buffer*/
> + while (!next_rxbuf->dma_addr) {
> + struct sk_buff *skb;
> + void *skb_data;
> +
> + skb = dev_alloc_skb(adpt->rxbuf_size + NET_IP_ALIGN);
> + if (!skb)
> + break;
> +
> + /* Make buffer alignment 2 beyond a 16 byte boundary
> + * this will result in a 16 byte aligned IP header after
> + * the 14 byte MAC header is removed
> + */
> + skb_reserve(skb, NET_IP_ALIGN);
__netdev_alloc_skb_ip_align will do this for you.
> + skb_data = skb->data;
> + curr_rxbuf->skb = skb;
> + curr_rxbuf->length = adpt->rxbuf_size;
> + curr_rxbuf->dma_addr = dma_map_single(adpt->netdev->dev.parent,
> + skb_data,
> + curr_rxbuf->length,
> + DMA_FROM_DEVICE);
Mapping can fail. You should check the result via dma_mapping_error().
There are several other places in which dma_map_single() is called and the return value
is not checked.
> +/* Bringup the interface/HW */
> +int emac_mac_up(struct emac_adapter *adpt)
> +{
> + struct net_device *netdev = adpt->netdev;
> + struct emac_irq *irq = &adpt->irq;
> + int ret;
> +
> + emac_mac_rx_tx_ring_reset_all(adpt);
> + emac_mac_config(adpt);
> +
> + ret = request_irq(irq->irq, emac_isr, 0, EMAC_MAC_IRQ_RES, irq);
> + if (ret) {
> + netdev_err(adpt->netdev,
> + "error:%d on request_irq(%d:%s flags:0)\n", ret,
> + irq->irq, EMAC_MAC_IRQ_RES);
> + return ret;
> + }
> +
> + emac_mac_rx_descs_refill(adpt, &adpt->rx_q);
> +
> + ret = phy_connect_direct(netdev, adpt->phydev, emac_adjust_link,
> + PHY_INTERFACE_MODE_SGMII);
> + if (ret) {
> + netdev_err(adpt->netdev,
> + "error:%d on request_irq(%d:%s flags:0)\n", ret,
> + irq->irq, EMAC_MAC_IRQ_RES);
freeing the irq is missing
> +
> +/* Bring down the interface/HW */
> +void emac_mac_down(struct emac_adapter *adpt, bool reset)
> +{
> + struct net_device *netdev = adpt->netdev;
> + unsigned long flags;
> +
> + netif_stop_queue(netdev);
> + napi_disable(&adpt->rx_q.napi);
> +
> + phy_disconnect(adpt->phydev);
> +
> + /* disable mac irq */
> + writel(DIS_INT, adpt->base + EMAC_INT_STATUS);
> + writel(0, adpt->base + EMAC_INT_MASK);
> + synchronize_irq(adpt->irq.irq);
> + free_irq(adpt->irq.irq, &adpt->irq);
> + clear_bit(EMAC_STATUS_TASK_REINIT_REQ, &adpt->status);
> +
> + cancel_work_sync(&adpt->tx_ts_task);
> + spin_lock_irqsave(&adpt->tx_ts_lock, flags);
Maybe I am missing something but AFAICS tx_ts_lock is never called from irq context, so
there is no reason to disable irqs.
> +
> +/* Push the received skb to upper layers */
> +static void emac_receive_skb(struct emac_rx_queue *rx_q,
> + struct sk_buff *skb,
> + u16 vlan_tag, bool vlan_flag)
> +{
> + if (vlan_flag) {
> + u16 vlan;
> +
> + EMAC_TAG_TO_VLAN(vlan_tag, vlan);
> + __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan);
> + }
> +
> + napi_gro_receive(&rx_q->napi, skb);
napi_gro_receive requires rx checksum offload. However emac_receive_skb() is also called if
hardware checksumming is disabled.
> +
> +/* Transmit the packet using specified transmit queue */
> +int emac_mac_tx_buf_send(struct emac_adapter *adpt, struct emac_tx_queue *tx_q,
> + struct sk_buff *skb)
> +{
> + struct emac_tpd tpd;
> + u32 prod_idx;
> +
> + if (!emac_tx_has_enough_descs(tx_q, skb)) {
Drivers should avoid this situation right from the start by checking after each transmission if the max number
of possible descriptors is still available for a further transmission and stop the queue if there are not.
Furthermore there does not seem to be any function that wakes the queue up again once it has been stopped.
> +
> +/* reinitialize */
> +void emac_reinit_locked(struct emac_adapter *adpt)
> +{
> + while (test_and_set_bit(EMAC_STATUS_RESETTING, &adpt->status))
> + msleep(20); /* Reset might take few 10s of ms */
> +
> + emac_mac_down(adpt, true);
> +
> + emac_sgmii_reset(adpt);
> + emac_mac_up(adpt);
emac_mac_up() may fail, so this case should be handled properly.
> +/* Change the Maximum Transfer Unit (MTU) */
> +static int emac_change_mtu(struct net_device *netdev, int new_mtu)
> +{
> + unsigned int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;
> + struct emac_adapter *adpt = netdev_priv(netdev);
> + unsigned int old_mtu = netdev->mtu;
> +
> + if ((max_frame < EMAC_MIN_ETH_FRAME_SIZE) ||
> + (max_frame > EMAC_MAX_ETH_FRAME_SIZE)) {
> + netdev_err(adpt->netdev, "error: invalid MTU setting\n");
> + return -EINVAL;
> + }
> +
> + if ((old_mtu != new_mtu) && netif_running(netdev)) {
Setting the new mtu in case that the interface is down is missing.
Also the first check is not needed, since this function is only called if
there is a change of the mtu.
> +/* Provide network statistics info for the interface */
> +static struct rtnl_link_stats64 *emac_get_stats64(struct net_device *netdev,
> + struct rtnl_link_stats64 *net_stats)
> +{
> + struct emac_adapter *adpt = netdev_priv(netdev);
> + unsigned int addr = REG_MAC_RX_STATUS_BIN;
> + struct emac_stats *stats = &adpt->stats;
> + u64 *stats_itr = &adpt->stats.rx_ok;
> + u32 val;
> +
> + mutex_lock(&stats->lock);
It is not allowed to sleep in this function, so you have to use something else for locking,
e.g. a spinlock.
> +static int emac_probe(struct platform_device *pdev)
> +{
> + struct net_device *netdev;
> + struct emac_adapter *adpt;
> + struct emac_phy *phy;
> + u16 devid, revid;
> + u32 reg;
> + int ret;
> +
> + /* The EMAC itself is capable of 64-bit DMA. If the SOC limits that
> + * range, then we expect platform code to adjust the mask accordingly.
> + */
> + ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
> + if (ret) {
> + dev_err(&pdev->dev, "could not set DMA mask\n");
> + return ret;
> + }
> +
> + netdev = alloc_etherdev(sizeof(struct emac_adapter));
> + if (!netdev)
> + return -ENOMEM;
> +
> + dev_set_drvdata(&pdev->dev, netdev);
> + SET_NETDEV_DEV(netdev, &pdev->dev);
> +
> + adpt = netdev_priv(netdev);
> + adpt->netdev = netdev;
> + phy = &adpt->phy;
> + adpt->msg_enable = EMAC_MSG_DEFAULT;
> +
> + mutex_init(&adpt->stats.lock);
> +
> + adpt->irq.mask = RX_PKT_INT0 | IMR_NORMAL_MASK;
> +
> + ret = emac_probe_resources(pdev, adpt);
> + if (ret)
> + goto err_undo_netdev;
> +
> + /* initialize clocks */
> + ret = emac_clks_phase1_init(pdev, adpt);
> + if (ret)
> + goto err_undo_resources;
> +
> + netdev->watchdog_timeo = EMAC_WATCHDOG_TIME;
> + netdev->irq = adpt->irq.irq;
> +
> + if (adpt->timestamp_en)
> + adpt->rrd_size = EMAC_TS_RRD_SIZE;
> + else
> + adpt->rrd_size = EMAC_RRD_SIZE;
> +
> + adpt->tpd_size = EMAC_TPD_SIZE;
> + adpt->rfd_size = EMAC_RFD_SIZE;
> +
> + /* init netdev */
> + netdev->netdev_ops = &emac_netdev_ops;
> +
> + /* init adapter */
> + emac_init_adapter(adpt);
> +
> + /* init phy */
> + ret = emac_phy_config(pdev, adpt);
> + if (ret)
> + goto err_undo_clk_phase1;
> +
> + /* enable clocks */
> + ret = emac_clks_phase2_init(pdev, adpt);
> + if (ret)
> + goto err_undo_clk_phase2;
> +
> + /* reset mac */
> + emac_mac_reset(adpt);
> +
> + /* set hw features */
> + netdev->features = NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM |
> + NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_HW_VLAN_CTAG_RX |
> + NETIF_F_HW_VLAN_CTAG_TX;
> + netdev->hw_features = netdev->features;
> +
> + netdev->vlan_features |= NETIF_F_SG | NETIF_F_HW_CSUM |
> + NETIF_F_TSO | NETIF_F_TSO6;
> +
> + INIT_WORK(&adpt->work_thread, emac_work_thread);
> +
> + /* Initialize queues */
> + emac_mac_rx_tx_ring_init_all(pdev, adpt);
> +
> + netif_napi_add(netdev, &adpt->rx_q.napi, emac_napi_rtx, 64);
> +
> + spin_lock_init(&adpt->tx_ts_lock);
> + skb_queue_head_init(&adpt->tx_ts_pending_queue);
> + skb_queue_head_init(&adpt->tx_ts_ready_queue);
> + INIT_WORK(&adpt->tx_ts_task, emac_mac_tx_ts_periodic_routine);
> +
> + strlcpy(netdev->name, "eth%d", sizeof(netdev->name));
This is already done by alloc_etherdev.
Regards,
Lino
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