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Message-Id: <20220305002305.1710462-4-robert.hancock@calian.com>
Date: Fri, 4 Mar 2022 18:23:01 -0600
From: Robert Hancock <robert.hancock@...ian.com>
To: netdev@...r.kernel.org
Cc: radhey.shyam.pandey@...inx.com, davem@...emloft.net,
kuba@...nel.org, michal.simek@...inx.com, linux@...linux.org.uk,
daniel@...earbox.net, linux-arm-kernel@...ts.infradead.org,
Robert Hancock <robert.hancock@...ian.com>
Subject: [PATCH net-next v2 3/7] net: axienet: Clean up DMA start/stop and error handling
Simplify the DMA error handling process, and remove some duplicated code
between the DMA error handling and the stop function.
Signed-off-by: Robert Hancock <robert.hancock@...ian.com>
---
.../net/ethernet/xilinx/xilinx_axienet_main.c | 280 +++++++-----------
1 file changed, 105 insertions(+), 175 deletions(-)
diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index 5a1ffdf9d8f7..d705b62c3958 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -226,6 +226,44 @@ static void axienet_dma_bd_release(struct net_device *ndev)
lp->rx_bd_p);
}
+/**
+ * axienet_dma_start - Set up DMA registers and start DMA operation
+ * @lp: Pointer to the axienet_local structure
+ */
+static void axienet_dma_start(struct axienet_local *lp)
+{
+ u32 rx_cr, tx_cr;
+
+ /* Start updating the Rx channel control register */
+ rx_cr = (lp->coalesce_count_rx << XAXIDMA_COALESCE_SHIFT) |
+ (XAXIDMA_DFT_RX_WAITBOUND << XAXIDMA_DELAY_SHIFT) |
+ XAXIDMA_IRQ_ALL_MASK;
+ axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, rx_cr);
+
+ /* Start updating the Tx channel control register */
+ tx_cr = (lp->coalesce_count_tx << XAXIDMA_COALESCE_SHIFT) |
+ (XAXIDMA_DFT_TX_WAITBOUND << XAXIDMA_DELAY_SHIFT) |
+ XAXIDMA_IRQ_ALL_MASK;
+ axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, tx_cr);
+
+ /* Populate the tail pointer and bring the Rx Axi DMA engine out of
+ * halted state. This will make the Rx side ready for reception.
+ */
+ axienet_dma_out_addr(lp, XAXIDMA_RX_CDESC_OFFSET, lp->rx_bd_p);
+ rx_cr |= XAXIDMA_CR_RUNSTOP_MASK;
+ axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, rx_cr);
+ axienet_dma_out_addr(lp, XAXIDMA_RX_TDESC_OFFSET, lp->rx_bd_p +
+ (sizeof(*lp->rx_bd_v) * (lp->rx_bd_num - 1)));
+
+ /* Write to the RS (Run-stop) bit in the Tx channel control register.
+ * Tx channel is now ready to run. But only after we write to the
+ * tail pointer register that the Tx channel will start transmitting.
+ */
+ axienet_dma_out_addr(lp, XAXIDMA_TX_CDESC_OFFSET, lp->tx_bd_p);
+ tx_cr |= XAXIDMA_CR_RUNSTOP_MASK;
+ axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, tx_cr);
+}
+
/**
* axienet_dma_bd_init - Setup buffer descriptor rings for Axi DMA
* @ndev: Pointer to the net_device structure
@@ -238,7 +276,6 @@ static void axienet_dma_bd_release(struct net_device *ndev)
*/
static int axienet_dma_bd_init(struct net_device *ndev)
{
- u32 cr;
int i;
struct sk_buff *skb;
struct axienet_local *lp = netdev_priv(ndev);
@@ -296,50 +333,7 @@ static int axienet_dma_bd_init(struct net_device *ndev)
lp->rx_bd_v[i].cntrl = lp->max_frm_size;
}
- /* Start updating the Rx channel control register */
- cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
- /* Update the interrupt coalesce count */
- cr = ((cr & ~XAXIDMA_COALESCE_MASK) |
- ((lp->coalesce_count_rx) << XAXIDMA_COALESCE_SHIFT));
- /* Update the delay timer count */
- cr = ((cr & ~XAXIDMA_DELAY_MASK) |
- (XAXIDMA_DFT_RX_WAITBOUND << XAXIDMA_DELAY_SHIFT));
- /* Enable coalesce, delay timer and error interrupts */
- cr |= XAXIDMA_IRQ_ALL_MASK;
- /* Write to the Rx channel control register */
- axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
-
- /* Start updating the Tx channel control register */
- cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
- /* Update the interrupt coalesce count */
- cr = (((cr & ~XAXIDMA_COALESCE_MASK)) |
- ((lp->coalesce_count_tx) << XAXIDMA_COALESCE_SHIFT));
- /* Update the delay timer count */
- cr = (((cr & ~XAXIDMA_DELAY_MASK)) |
- (XAXIDMA_DFT_TX_WAITBOUND << XAXIDMA_DELAY_SHIFT));
- /* Enable coalesce, delay timer and error interrupts */
- cr |= XAXIDMA_IRQ_ALL_MASK;
- /* Write to the Tx channel control register */
- axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr);
-
- /* Populate the tail pointer and bring the Rx Axi DMA engine out of
- * halted state. This will make the Rx side ready for reception.
- */
- axienet_dma_out_addr(lp, XAXIDMA_RX_CDESC_OFFSET, lp->rx_bd_p);
- cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
- axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET,
- cr | XAXIDMA_CR_RUNSTOP_MASK);
- axienet_dma_out_addr(lp, XAXIDMA_RX_TDESC_OFFSET, lp->rx_bd_p +
- (sizeof(*lp->rx_bd_v) * (lp->rx_bd_num - 1)));
-
- /* Write to the RS (Run-stop) bit in the Tx channel control register.
- * Tx channel is now ready to run. But only after we write to the
- * tail pointer register that the Tx channel will start transmitting.
- */
- axienet_dma_out_addr(lp, XAXIDMA_TX_CDESC_OFFSET, lp->tx_bd_p);
- cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
- axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET,
- cr | XAXIDMA_CR_RUNSTOP_MASK);
+ axienet_dma_start(lp);
return 0;
out:
@@ -530,6 +524,44 @@ static int __axienet_device_reset(struct axienet_local *lp)
return 0;
}
+/**
+ * axienet_dma_stop - Stop DMA operation
+ * @lp: Pointer to the axienet_local structure
+ */
+static void axienet_dma_stop(struct axienet_local *lp)
+{
+ int count;
+ u32 cr, sr;
+
+ cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
+ cr &= ~(XAXIDMA_CR_RUNSTOP_MASK | XAXIDMA_IRQ_ALL_MASK);
+ axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
+ synchronize_irq(lp->rx_irq);
+
+ cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
+ cr &= ~(XAXIDMA_CR_RUNSTOP_MASK | XAXIDMA_IRQ_ALL_MASK);
+ axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr);
+ synchronize_irq(lp->tx_irq);
+
+ /* Give DMAs a chance to halt gracefully */
+ sr = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET);
+ for (count = 0; !(sr & XAXIDMA_SR_HALT_MASK) && count < 5; ++count) {
+ msleep(20);
+ sr = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET);
+ }
+
+ sr = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET);
+ for (count = 0; !(sr & XAXIDMA_SR_HALT_MASK) && count < 5; ++count) {
+ msleep(20);
+ sr = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET);
+ }
+
+ /* Do a reset to ensure DMA is really stopped */
+ axienet_lock_mii(lp);
+ __axienet_device_reset(lp);
+ axienet_unlock_mii(lp);
+}
+
/**
* axienet_device_reset - Reset and initialize the Axi Ethernet hardware.
* @ndev: Pointer to the net_device structure
@@ -949,41 +981,27 @@ static void axienet_recv(struct net_device *ndev)
*/
static irqreturn_t axienet_tx_irq(int irq, void *_ndev)
{
- u32 cr;
unsigned int status;
struct net_device *ndev = _ndev;
struct axienet_local *lp = netdev_priv(ndev);
status = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET);
- if (status & (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK)) {
- axienet_dma_out32(lp, XAXIDMA_TX_SR_OFFSET, status);
- axienet_start_xmit_done(lp->ndev);
- goto out;
- }
+
if (!(status & XAXIDMA_IRQ_ALL_MASK))
return IRQ_NONE;
- if (status & XAXIDMA_IRQ_ERROR_MASK) {
- dev_err(&ndev->dev, "DMA Tx error 0x%x\n", status);
- dev_err(&ndev->dev, "Current BD is at: 0x%x%08x\n",
- (lp->tx_bd_v[lp->tx_bd_ci]).phys_msb,
- (lp->tx_bd_v[lp->tx_bd_ci]).phys);
-
- cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
- /* Disable coalesce, delay timer and error interrupts */
- cr &= (~XAXIDMA_IRQ_ALL_MASK);
- /* Write to the Tx channel control register */
- axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr);
-
- cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
- /* Disable coalesce, delay timer and error interrupts */
- cr &= (~XAXIDMA_IRQ_ALL_MASK);
- /* Write to the Rx channel control register */
- axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
+ axienet_dma_out32(lp, XAXIDMA_TX_SR_OFFSET, status);
+
+ if (unlikely(status & XAXIDMA_IRQ_ERROR_MASK)) {
+ netdev_err(ndev, "DMA Tx error 0x%x\n", status);
+ netdev_err(ndev, "Current BD is at: 0x%x%08x\n",
+ (lp->tx_bd_v[lp->tx_bd_ci]).phys_msb,
+ (lp->tx_bd_v[lp->tx_bd_ci]).phys);
schedule_work(&lp->dma_err_task);
- axienet_dma_out32(lp, XAXIDMA_TX_SR_OFFSET, status);
+ } else {
+ axienet_start_xmit_done(lp->ndev);
}
-out:
+
return IRQ_HANDLED;
}
@@ -999,41 +1017,27 @@ static irqreturn_t axienet_tx_irq(int irq, void *_ndev)
*/
static irqreturn_t axienet_rx_irq(int irq, void *_ndev)
{
- u32 cr;
unsigned int status;
struct net_device *ndev = _ndev;
struct axienet_local *lp = netdev_priv(ndev);
status = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET);
- if (status & (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK)) {
- axienet_dma_out32(lp, XAXIDMA_RX_SR_OFFSET, status);
- axienet_recv(lp->ndev);
- goto out;
- }
+
if (!(status & XAXIDMA_IRQ_ALL_MASK))
return IRQ_NONE;
- if (status & XAXIDMA_IRQ_ERROR_MASK) {
- dev_err(&ndev->dev, "DMA Rx error 0x%x\n", status);
- dev_err(&ndev->dev, "Current BD is at: 0x%x%08x\n",
- (lp->rx_bd_v[lp->rx_bd_ci]).phys_msb,
- (lp->rx_bd_v[lp->rx_bd_ci]).phys);
-
- cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
- /* Disable coalesce, delay timer and error interrupts */
- cr &= (~XAXIDMA_IRQ_ALL_MASK);
- /* Finally write to the Tx channel control register */
- axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr);
-
- cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
- /* Disable coalesce, delay timer and error interrupts */
- cr &= (~XAXIDMA_IRQ_ALL_MASK);
- /* write to the Rx channel control register */
- axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
+ axienet_dma_out32(lp, XAXIDMA_RX_SR_OFFSET, status);
+
+ if (unlikely(status & XAXIDMA_IRQ_ERROR_MASK)) {
+ netdev_err(ndev, "DMA Rx error 0x%x\n", status);
+ netdev_err(ndev, "Current BD is at: 0x%x%08x\n",
+ (lp->rx_bd_v[lp->rx_bd_ci]).phys_msb,
+ (lp->rx_bd_v[lp->rx_bd_ci]).phys);
schedule_work(&lp->dma_err_task);
- axienet_dma_out32(lp, XAXIDMA_RX_SR_OFFSET, status);
+ } else {
+ axienet_recv(lp->ndev);
}
-out:
+
return IRQ_HANDLED;
}
@@ -1151,8 +1155,6 @@ static int axienet_open(struct net_device *ndev)
*/
static int axienet_stop(struct net_device *ndev)
{
- u32 cr, sr;
- int count;
struct axienet_local *lp = netdev_priv(ndev);
dev_dbg(&ndev->dev, "axienet_close()\n");
@@ -1163,34 +1165,10 @@ static int axienet_stop(struct net_device *ndev)
axienet_setoptions(ndev, lp->options &
~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
- cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
- cr &= ~(XAXIDMA_CR_RUNSTOP_MASK | XAXIDMA_IRQ_ALL_MASK);
- axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
-
- cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
- cr &= ~(XAXIDMA_CR_RUNSTOP_MASK | XAXIDMA_IRQ_ALL_MASK);
- axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr);
+ axienet_dma_stop(lp);
axienet_iow(lp, XAE_IE_OFFSET, 0);
- /* Give DMAs a chance to halt gracefully */
- sr = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET);
- for (count = 0; !(sr & XAXIDMA_SR_HALT_MASK) && count < 5; ++count) {
- msleep(20);
- sr = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET);
- }
-
- sr = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET);
- for (count = 0; !(sr & XAXIDMA_SR_HALT_MASK) && count < 5; ++count) {
- msleep(20);
- sr = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET);
- }
-
- /* Do a reset to ensure DMA is really stopped */
- axienet_lock_mii(lp);
- __axienet_device_reset(lp);
- axienet_unlock_mii(lp);
-
cancel_work_sync(&lp->dma_err_task);
if (lp->eth_irq > 0)
@@ -1709,22 +1687,17 @@ static const struct phylink_mac_ops axienet_phylink_ops = {
*/
static void axienet_dma_err_handler(struct work_struct *work)
{
+ u32 i;
u32 axienet_status;
- u32 cr, i;
+ struct axidma_bd *cur_p;
struct axienet_local *lp = container_of(work, struct axienet_local,
dma_err_task);
struct net_device *ndev = lp->ndev;
- struct axidma_bd *cur_p;
axienet_setoptions(ndev, lp->options &
~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
- /* When we do an Axi Ethernet reset, it resets the complete core
- * including the MDIO. MDIO must be disabled before resetting.
- * Hold MDIO bus lock to avoid MDIO accesses during the reset.
- */
- axienet_lock_mii(lp);
- __axienet_device_reset(lp);
- axienet_unlock_mii(lp);
+
+ axienet_dma_stop(lp);
for (i = 0; i < lp->tx_bd_num; i++) {
cur_p = &lp->tx_bd_v[i];
@@ -1764,50 +1737,7 @@ static void axienet_dma_err_handler(struct work_struct *work)
lp->tx_bd_tail = 0;
lp->rx_bd_ci = 0;
- /* Start updating the Rx channel control register */
- cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
- /* Update the interrupt coalesce count */
- cr = ((cr & ~XAXIDMA_COALESCE_MASK) |
- (XAXIDMA_DFT_RX_THRESHOLD << XAXIDMA_COALESCE_SHIFT));
- /* Update the delay timer count */
- cr = ((cr & ~XAXIDMA_DELAY_MASK) |
- (XAXIDMA_DFT_RX_WAITBOUND << XAXIDMA_DELAY_SHIFT));
- /* Enable coalesce, delay timer and error interrupts */
- cr |= XAXIDMA_IRQ_ALL_MASK;
- /* Finally write to the Rx channel control register */
- axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
-
- /* Start updating the Tx channel control register */
- cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
- /* Update the interrupt coalesce count */
- cr = (((cr & ~XAXIDMA_COALESCE_MASK)) |
- (XAXIDMA_DFT_TX_THRESHOLD << XAXIDMA_COALESCE_SHIFT));
- /* Update the delay timer count */
- cr = (((cr & ~XAXIDMA_DELAY_MASK)) |
- (XAXIDMA_DFT_TX_WAITBOUND << XAXIDMA_DELAY_SHIFT));
- /* Enable coalesce, delay timer and error interrupts */
- cr |= XAXIDMA_IRQ_ALL_MASK;
- /* Finally write to the Tx channel control register */
- axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr);
-
- /* Populate the tail pointer and bring the Rx Axi DMA engine out of
- * halted state. This will make the Rx side ready for reception.
- */
- axienet_dma_out_addr(lp, XAXIDMA_RX_CDESC_OFFSET, lp->rx_bd_p);
- cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
- axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET,
- cr | XAXIDMA_CR_RUNSTOP_MASK);
- axienet_dma_out_addr(lp, XAXIDMA_RX_TDESC_OFFSET, lp->rx_bd_p +
- (sizeof(*lp->rx_bd_v) * (lp->rx_bd_num - 1)));
-
- /* Write to the RS (Run-stop) bit in the Tx channel control register.
- * Tx channel is now ready to run. But only after we write to the
- * tail pointer register that the Tx channel will start transmitting
- */
- axienet_dma_out_addr(lp, XAXIDMA_TX_CDESC_OFFSET, lp->tx_bd_p);
- cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
- axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET,
- cr | XAXIDMA_CR_RUNSTOP_MASK);
+ axienet_dma_start(lp);
axienet_status = axienet_ior(lp, XAE_RCW1_OFFSET);
axienet_status &= ~XAE_RCW1_RX_MASK;
--
2.31.1
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