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path: root/drivers/net/ethernet/cadence
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Diffstat (limited to 'drivers/net/ethernet/cadence')
-rw-r--r--drivers/net/ethernet/cadence/macb.h6
-rw-r--r--drivers/net/ethernet/cadence/macb_main.c315
2 files changed, 200 insertions, 121 deletions
diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
index f0a7d8396a4a..7ca077b65eaa 100644
--- a/drivers/net/ethernet/cadence/macb.h
+++ b/drivers/net/ethernet/cadence/macb.h
@@ -1204,11 +1204,15 @@ struct macb_queue {
unsigned int RBQP;
unsigned int RBQPH;
+ /* Lock to protect tx_head and tx_tail */
+ spinlock_t tx_ptr_lock;
unsigned int tx_head, tx_tail;
struct macb_dma_desc *tx_ring;
struct macb_tx_skb *tx_skb;
dma_addr_t tx_ring_dma;
struct work_struct tx_error_task;
+ bool txubr_pending;
+ struct napi_struct napi_tx;
dma_addr_t rx_ring_dma;
dma_addr_t rx_buffers_dma;
@@ -1217,7 +1221,7 @@ struct macb_queue {
struct macb_dma_desc *rx_ring;
struct sk_buff **rx_skbuff;
void *rx_buffers;
- struct napi_struct napi;
+ struct napi_struct napi_rx;
struct queue_stats stats;
#ifdef CONFIG_MACB_USE_HWSTAMP
diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 61284baa0496..d6cdb97bfb38 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -337,11 +337,9 @@ static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
struct macb *bp = bus->priv;
int status;
- status = pm_runtime_get_sync(&bp->pdev->dev);
- if (status < 0) {
- pm_runtime_put_noidle(&bp->pdev->dev);
+ status = pm_runtime_resume_and_get(&bp->pdev->dev);
+ if (status < 0)
goto mdio_pm_exit;
- }
status = macb_mdio_wait_for_idle(bp);
if (status < 0)
@@ -391,11 +389,9 @@ static int macb_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
struct macb *bp = bus->priv;
int status;
- status = pm_runtime_get_sync(&bp->pdev->dev);
- if (status < 0) {
- pm_runtime_put_noidle(&bp->pdev->dev);
+ status = pm_runtime_resume_and_get(&bp->pdev->dev);
+ if (status < 0)
goto mdio_pm_exit;
- }
status = macb_mdio_wait_for_idle(bp);
if (status < 0)
@@ -963,7 +959,7 @@ static int macb_halt_tx(struct macb *bp)
return -ETIMEDOUT;
}
-static void macb_tx_unmap(struct macb *bp, struct macb_tx_skb *tx_skb)
+static void macb_tx_unmap(struct macb *bp, struct macb_tx_skb *tx_skb, int budget)
{
if (tx_skb->mapping) {
if (tx_skb->mapped_as_page)
@@ -976,7 +972,7 @@ static void macb_tx_unmap(struct macb *bp, struct macb_tx_skb *tx_skb)
}
if (tx_skb->skb) {
- dev_kfree_skb_any(tx_skb->skb);
+ napi_consume_skb(tx_skb->skb, budget);
tx_skb->skb = NULL;
}
}
@@ -1029,12 +1025,13 @@ static void macb_tx_error_task(struct work_struct *work)
(unsigned int)(queue - bp->queues),
queue->tx_tail, queue->tx_head);
- /* Prevent the queue IRQ handlers from running: each of them may call
- * macb_tx_interrupt(), which in turn may call netif_wake_subqueue().
+ /* Prevent the queue NAPI TX poll from running, as it calls
+ * macb_tx_complete(), which in turn may call netif_wake_subqueue().
* As explained below, we have to halt the transmission before updating
* TBQP registers so we call netif_tx_stop_all_queues() to notify the
* network engine about the macb/gem being halted.
*/
+ napi_disable(&queue->napi_tx);
spin_lock_irqsave(&bp->lock, flags);
/* Make sure nobody is trying to queue up new packets */
@@ -1062,7 +1059,7 @@ static void macb_tx_error_task(struct work_struct *work)
if (ctrl & MACB_BIT(TX_USED)) {
/* skb is set for the last buffer of the frame */
while (!skb) {
- macb_tx_unmap(bp, tx_skb);
+ macb_tx_unmap(bp, tx_skb, 0);
tail++;
tx_skb = macb_tx_skb(queue, tail);
skb = tx_skb->skb;
@@ -1092,7 +1089,7 @@ static void macb_tx_error_task(struct work_struct *work)
desc->ctrl = ctrl | MACB_BIT(TX_USED);
}
- macb_tx_unmap(bp, tx_skb);
+ macb_tx_unmap(bp, tx_skb, 0);
}
/* Set end of TX queue */
@@ -1122,27 +1119,20 @@ static void macb_tx_error_task(struct work_struct *work)
macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
spin_unlock_irqrestore(&bp->lock, flags);
+ napi_enable(&queue->napi_tx);
}
-static void macb_tx_interrupt(struct macb_queue *queue)
+static int macb_tx_complete(struct macb_queue *queue, int budget)
{
- unsigned int tail;
- unsigned int head;
- u32 status;
struct macb *bp = queue->bp;
u16 queue_index = queue - bp->queues;
+ unsigned int tail;
+ unsigned int head;
+ int packets = 0;
- status = macb_readl(bp, TSR);
- macb_writel(bp, TSR, status);
-
- if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
- queue_writel(queue, ISR, MACB_BIT(TCOMP));
-
- netdev_vdbg(bp->dev, "macb_tx_interrupt status = 0x%03lx\n",
- (unsigned long)status);
-
+ spin_lock(&queue->tx_ptr_lock);
head = queue->tx_head;
- for (tail = queue->tx_tail; tail != head; tail++) {
+ for (tail = queue->tx_tail; tail != head && packets < budget; tail++) {
struct macb_tx_skb *tx_skb;
struct sk_buff *skb;
struct macb_dma_desc *desc;
@@ -1183,10 +1173,11 @@ static void macb_tx_interrupt(struct macb_queue *queue)
queue->stats.tx_packets++;
bp->dev->stats.tx_bytes += skb->len;
queue->stats.tx_bytes += skb->len;
+ packets++;
}
/* Now we can safely release resources */
- macb_tx_unmap(bp, tx_skb);
+ macb_tx_unmap(bp, tx_skb, budget);
/* skb is set only for the last buffer of the frame.
* WARNING: at this point skb has been freed by
@@ -1202,6 +1193,9 @@ static void macb_tx_interrupt(struct macb_queue *queue)
CIRC_CNT(queue->tx_head, queue->tx_tail,
bp->tx_ring_size) <= MACB_TX_WAKEUP_THRESH(bp))
netif_wake_subqueue(bp->dev, queue_index);
+ spin_unlock(&queue->tx_ptr_lock);
+
+ return packets;
}
static void gem_rx_refill(struct macb_queue *queue)
@@ -1558,54 +1552,51 @@ static int macb_rx(struct macb_queue *queue, struct napi_struct *napi,
return received;
}
-static int macb_poll(struct napi_struct *napi, int budget)
+static bool macb_rx_pending(struct macb_queue *queue)
{
- struct macb_queue *queue = container_of(napi, struct macb_queue, napi);
struct macb *bp = queue->bp;
- int work_done;
- u32 status;
+ unsigned int entry;
+ struct macb_dma_desc *desc;
+
+ entry = macb_rx_ring_wrap(bp, queue->rx_tail);
+ desc = macb_rx_desc(queue, entry);
+
+ /* Make hw descriptor updates visible to CPU */
+ rmb();
- status = macb_readl(bp, RSR);
- macb_writel(bp, RSR, status);
+ return (desc->addr & MACB_BIT(RX_USED)) != 0;
+}
- netdev_vdbg(bp->dev, "poll: status = %08lx, budget = %d\n",
- (unsigned long)status, budget);
+static int macb_rx_poll(struct napi_struct *napi, int budget)
+{
+ struct macb_queue *queue = container_of(napi, struct macb_queue, napi_rx);
+ struct macb *bp = queue->bp;
+ int work_done;
work_done = bp->macbgem_ops.mog_rx(queue, napi, budget);
- if (work_done < budget) {
- napi_complete_done(napi, work_done);
- /* RSR bits only seem to propagate to raise interrupts when
- * interrupts are enabled at the time, so if bits are already
- * set due to packets received while interrupts were disabled,
+ netdev_vdbg(bp->dev, "RX poll: queue = %u, work_done = %d, budget = %d\n",
+ (unsigned int)(queue - bp->queues), work_done, budget);
+
+ if (work_done < budget && napi_complete_done(napi, work_done)) {
+ queue_writel(queue, IER, bp->rx_intr_mask);
+
+ /* Packet completions only seem to propagate to raise
+ * interrupts when interrupts are enabled at the time, so if
+ * packets were received while interrupts were disabled,
* they will not cause another interrupt to be generated when
* interrupts are re-enabled.
- * Check for this case here. This has been seen to happen
- * around 30% of the time under heavy network load.
+ * Check for this case here to avoid losing a wakeup. This can
+ * potentially race with the interrupt handler doing the same
+ * actions if an interrupt is raised just after enabling them,
+ * but this should be harmless.
*/
- status = macb_readl(bp, RSR);
- if (status) {
+ if (macb_rx_pending(queue)) {
+ queue_writel(queue, IDR, bp->rx_intr_mask);
if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
queue_writel(queue, ISR, MACB_BIT(RCOMP));
- napi_reschedule(napi);
- } else {
- queue_writel(queue, IER, bp->rx_intr_mask);
-
- /* In rare cases, packets could have been received in
- * the window between the check above and re-enabling
- * interrupts. Therefore, a double-check is required
- * to avoid losing a wakeup. This can potentially race
- * with the interrupt handler doing the same actions
- * if an interrupt is raised just after enabling them,
- * but this should be harmless.
- */
- status = macb_readl(bp, RSR);
- if (unlikely(status)) {
- queue_writel(queue, IDR, bp->rx_intr_mask);
- if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
- queue_writel(queue, ISR, MACB_BIT(RCOMP));
- napi_schedule(napi);
- }
+ netdev_vdbg(bp->dev, "poll: packets pending, reschedule\n");
+ napi_schedule(napi);
}
}
@@ -1614,6 +1605,90 @@ static int macb_poll(struct napi_struct *napi, int budget)
return work_done;
}
+static void macb_tx_restart(struct macb_queue *queue)
+{
+ struct macb *bp = queue->bp;
+ unsigned int head_idx, tbqp;
+
+ spin_lock(&queue->tx_ptr_lock);
+
+ if (queue->tx_head == queue->tx_tail)
+ goto out_tx_ptr_unlock;
+
+ tbqp = queue_readl(queue, TBQP) / macb_dma_desc_get_size(bp);
+ tbqp = macb_adj_dma_desc_idx(bp, macb_tx_ring_wrap(bp, tbqp));
+ head_idx = macb_adj_dma_desc_idx(bp, macb_tx_ring_wrap(bp, queue->tx_head));
+
+ if (tbqp == head_idx)
+ goto out_tx_ptr_unlock;
+
+ spin_lock_irq(&bp->lock);
+ macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
+ spin_unlock_irq(&bp->lock);
+
+out_tx_ptr_unlock:
+ spin_unlock(&queue->tx_ptr_lock);
+}
+
+static bool macb_tx_complete_pending(struct macb_queue *queue)
+{
+ bool retval = false;
+
+ spin_lock(&queue->tx_ptr_lock);
+ if (queue->tx_head != queue->tx_tail) {
+ /* Make hw descriptor updates visible to CPU */
+ rmb();
+
+ if (macb_tx_desc(queue, queue->tx_tail)->ctrl & MACB_BIT(TX_USED))
+ retval = true;
+ }
+ spin_unlock(&queue->tx_ptr_lock);
+ return retval;
+}
+
+static int macb_tx_poll(struct napi_struct *napi, int budget)
+{
+ struct macb_queue *queue = container_of(napi, struct macb_queue, napi_tx);
+ struct macb *bp = queue->bp;
+ int work_done;
+
+ work_done = macb_tx_complete(queue, budget);
+
+ rmb(); // ensure txubr_pending is up to date
+ if (queue->txubr_pending) {
+ queue->txubr_pending = false;
+ netdev_vdbg(bp->dev, "poll: tx restart\n");
+ macb_tx_restart(queue);
+ }
+
+ netdev_vdbg(bp->dev, "TX poll: queue = %u, work_done = %d, budget = %d\n",
+ (unsigned int)(queue - bp->queues), work_done, budget);
+
+ if (work_done < budget && napi_complete_done(napi, work_done)) {
+ queue_writel(queue, IER, MACB_BIT(TCOMP));
+
+ /* Packet completions only seem to propagate to raise
+ * interrupts when interrupts are enabled at the time, so if
+ * packets were sent while interrupts were disabled,
+ * they will not cause another interrupt to be generated when
+ * interrupts are re-enabled.
+ * Check for this case here to avoid losing a wakeup. This can
+ * potentially race with the interrupt handler doing the same
+ * actions if an interrupt is raised just after enabling them,
+ * but this should be harmless.
+ */
+ if (macb_tx_complete_pending(queue)) {
+ queue_writel(queue, IDR, MACB_BIT(TCOMP));
+ if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+ queue_writel(queue, ISR, MACB_BIT(TCOMP));
+ netdev_vdbg(bp->dev, "TX poll: packets pending, reschedule\n");
+ napi_schedule(napi);
+ }
+ }
+
+ return work_done;
+}
+
static void macb_hresp_error_task(struct tasklet_struct *t)
{
struct macb *bp = from_tasklet(bp, t, hresp_err_tasklet);
@@ -1653,29 +1728,6 @@ static void macb_hresp_error_task(struct tasklet_struct *t)
netif_tx_start_all_queues(dev);
}
-static void macb_tx_restart(struct macb_queue *queue)
-{
- unsigned int head = queue->tx_head;
- unsigned int tail = queue->tx_tail;
- struct macb *bp = queue->bp;
- unsigned int head_idx, tbqp;
-
- if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
- queue_writel(queue, ISR, MACB_BIT(TXUBR));
-
- if (head == tail)
- return;
-
- tbqp = queue_readl(queue, TBQP) / macb_dma_desc_get_size(bp);
- tbqp = macb_adj_dma_desc_idx(bp, macb_tx_ring_wrap(bp, tbqp));
- head_idx = macb_adj_dma_desc_idx(bp, macb_tx_ring_wrap(bp, head));
-
- if (tbqp == head_idx)
- return;
-
- macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
-}
-
static irqreturn_t macb_wol_interrupt(int irq, void *dev_id)
{
struct macb_queue *queue = dev_id;
@@ -1772,9 +1824,27 @@ static irqreturn_t macb_interrupt(int irq, void *dev_id)
if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
queue_writel(queue, ISR, MACB_BIT(RCOMP));
- if (napi_schedule_prep(&queue->napi)) {
+ if (napi_schedule_prep(&queue->napi_rx)) {
netdev_vdbg(bp->dev, "scheduling RX softirq\n");
- __napi_schedule(&queue->napi);
+ __napi_schedule(&queue->napi_rx);
+ }
+ }
+
+ if (status & (MACB_BIT(TCOMP) |
+ MACB_BIT(TXUBR))) {
+ queue_writel(queue, IDR, MACB_BIT(TCOMP));
+ if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+ queue_writel(queue, ISR, MACB_BIT(TCOMP) |
+ MACB_BIT(TXUBR));
+
+ if (status & MACB_BIT(TXUBR)) {
+ queue->txubr_pending = true;
+ wmb(); // ensure softirq can see update
+ }
+
+ if (napi_schedule_prep(&queue->napi_tx)) {
+ netdev_vdbg(bp->dev, "scheduling TX softirq\n");
+ __napi_schedule(&queue->napi_tx);
}
}
@@ -1788,12 +1858,6 @@ static irqreturn_t macb_interrupt(int irq, void *dev_id)
break;
}
- if (status & MACB_BIT(TCOMP))
- macb_tx_interrupt(queue);
-
- if (status & MACB_BIT(TXUBR))
- macb_tx_restart(queue);
-
/* Link change detection isn't possible with RMII, so we'll
* add that if/when we get our hands on a full-blown MII PHY.
*/
@@ -2026,7 +2090,7 @@ dma_error:
for (i = queue->tx_head; i != tx_head; i++) {
tx_skb = macb_tx_skb(queue, i);
- macb_tx_unmap(bp, tx_skb);
+ macb_tx_unmap(bp, tx_skb, 0);
}
return 0;
@@ -2148,7 +2212,6 @@ static netdev_tx_t macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
u16 queue_index = skb_get_queue_mapping(skb);
struct macb *bp = netdev_priv(dev);
struct macb_queue *queue = &bp->queues[queue_index];
- unsigned long flags;
unsigned int desc_cnt, nr_frags, frag_size, f;
unsigned int hdrlen;
bool is_lso;
@@ -2205,16 +2268,16 @@ static netdev_tx_t macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
desc_cnt += DIV_ROUND_UP(frag_size, bp->max_tx_length);
}
- spin_lock_irqsave(&bp->lock, flags);
+ spin_lock_bh(&queue->tx_ptr_lock);
/* This is a hard error, log it. */
if (CIRC_SPACE(queue->tx_head, queue->tx_tail,
bp->tx_ring_size) < desc_cnt) {
netif_stop_subqueue(dev, queue_index);
- spin_unlock_irqrestore(&bp->lock, flags);
netdev_dbg(bp->dev, "tx_head = %u, tx_tail = %u\n",
queue->tx_head, queue->tx_tail);
- return NETDEV_TX_BUSY;
+ ret = NETDEV_TX_BUSY;
+ goto unlock;
}
/* Map socket buffer for DMA transfer */
@@ -2227,13 +2290,15 @@ static netdev_tx_t macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
wmb();
skb_tx_timestamp(skb);
+ spin_lock_irq(&bp->lock);
macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
+ spin_unlock_irq(&bp->lock);
if (CIRC_SPACE(queue->tx_head, queue->tx_tail, bp->tx_ring_size) < 1)
netif_stop_subqueue(dev, queue_index);
unlock:
- spin_unlock_irqrestore(&bp->lock, flags);
+ spin_unlock_bh(&queue->tx_ptr_lock);
return ret;
}
@@ -2753,9 +2818,9 @@ static int macb_open(struct net_device *dev)
netdev_dbg(bp->dev, "open\n");
- err = pm_runtime_get_sync(&bp->pdev->dev);
+ err = pm_runtime_resume_and_get(&bp->pdev->dev);
if (err < 0)
- goto pm_exit;
+ return err;
/* RX buffers initialization */
macb_init_rx_buffer_size(bp, bufsz);
@@ -2767,8 +2832,10 @@ static int macb_open(struct net_device *dev)
goto pm_exit;
}
- for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
- napi_enable(&queue->napi);
+ for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
+ napi_enable(&queue->napi_rx);
+ napi_enable(&queue->napi_tx);
+ }
macb_init_hw(bp);
@@ -2792,8 +2859,10 @@ phy_off:
reset_hw:
macb_reset_hw(bp);
- for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
- napi_disable(&queue->napi);
+ for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
+ napi_disable(&queue->napi_rx);
+ napi_disable(&queue->napi_tx);
+ }
macb_free_consistent(bp);
pm_exit:
pm_runtime_put_sync(&bp->pdev->dev);
@@ -2809,8 +2878,10 @@ static int macb_close(struct net_device *dev)
netif_tx_stop_all_queues(dev);
- for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
- napi_disable(&queue->napi);
+ for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
+ napi_disable(&queue->napi_rx);
+ napi_disable(&queue->napi_tx);
+ }
phylink_stop(bp->phylink);
phylink_disconnect_phy(bp->phylink);
@@ -3872,7 +3943,9 @@ static int macb_init(struct platform_device *pdev)
queue = &bp->queues[q];
queue->bp = bp;
- netif_napi_add(dev, &queue->napi, macb_poll, NAPI_POLL_WEIGHT);
+ spin_lock_init(&queue->tx_ptr_lock);
+ netif_napi_add(dev, &queue->napi_rx, macb_rx_poll, NAPI_POLL_WEIGHT);
+ netif_napi_add(dev, &queue->napi_tx, macb_tx_poll, NAPI_POLL_WEIGHT);
if (hw_q) {
queue->ISR = GEM_ISR(hw_q - 1);
queue->IER = GEM_IER(hw_q - 1);
@@ -4142,11 +4215,9 @@ static int at91ether_open(struct net_device *dev)
u32 ctl;
int ret;
- ret = pm_runtime_get_sync(&lp->pdev->dev);
- if (ret < 0) {
- pm_runtime_put_noidle(&lp->pdev->dev);
+ ret = pm_runtime_resume_and_get(&lp->pdev->dev);
+ if (ret < 0)
return ret;
- }
/* Clear internal statistics */
ctl = macb_readl(lp, NCR);
@@ -4594,7 +4665,7 @@ static int zynqmp_init(struct platform_device *pdev)
if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII) {
/* Ensure PS-GTR PHY device used in SGMII mode is ready */
- bp->sgmii_phy = devm_phy_get(&pdev->dev, "sgmii-phy");
+ bp->sgmii_phy = devm_phy_optional_get(&pdev->dev, NULL);
if (IS_ERR(bp->sgmii_phy)) {
ret = PTR_ERR(bp->sgmii_phy);
@@ -4981,8 +5052,10 @@ static int __maybe_unused macb_suspend(struct device *dev)
netif_device_detach(netdev);
for (q = 0, queue = bp->queues; q < bp->num_queues;
- ++q, ++queue)
- napi_disable(&queue->napi);
+ ++q, ++queue) {
+ napi_disable(&queue->napi_rx);
+ napi_disable(&queue->napi_tx);
+ }
if (!(bp->wol & MACB_WOL_ENABLED)) {
rtnl_lock();
@@ -5060,8 +5133,10 @@ static int __maybe_unused macb_resume(struct device *dev)
}
for (q = 0, queue = bp->queues; q < bp->num_queues;
- ++q, ++queue)
- napi_enable(&queue->napi);
+ ++q, ++queue) {
+ napi_enable(&queue->napi_rx);
+ napi_enable(&queue->napi_tx);
+ }
if (netdev->hw_features & NETIF_F_NTUPLE)
gem_writel_n(bp, ETHT, SCRT2_ETHT, bp->pm_data.scrt2);