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Date: Sat, 5 Sep 2015 14:18:54 +0200
From: romieu@...zoreil.com
To: netdev@...r.kernel.org
Cc: David Miller <davem@...emloft.net>,
Francois Romieu <romieu@...zoreil.com>,
pomidorabelisima@...il.com, vinschen@...hat.com
Subject: [PATCH net 3/3] r8169: increase the lifespan of the hardware counters dump area.
From: Francois Romieu <romieu@...zoreil.com>
net/core/net-sysfs.c::netstat_show retrieves stats with spinlock held.
This change avoids sleepable allocation and performs some housekeeping:
- receive ring, transmit ring and counters dump area allocation failures
are all considered fatal during open()
- netif_warn is now redundant with rtl_reset_counters_cond built-in
failure message.
- rtl_reset_counters_cond induced failures in open() are also considered
fatal: it takes acceptable work to unwind comfortably.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=104031
Fixes: 6e85d5ad36a2 ("r8169: Add values missing in @get_stats64 from HW counters")
Signed-off-by: Francois Romieu <romieu@...zoreil.com>
Cc: Corinna Vinschen <vinschen@...hat.com>
Cc: pomidorabelisima@...il.com
---
drivers/net/ethernet/realtek/r8169.c | 132 +++++++++++++++--------------------
1 file changed, 55 insertions(+), 77 deletions(-)
diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index c0a5edb..ae07567 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -833,8 +833,11 @@ struct rtl8169_private {
unsigned features;
struct mii_if_info mii;
+
struct rtl8169_counters *counters;
struct rtl8169_tc_offsets tc_offset;
+ dma_addr_t counters_map;
+
u32 saved_wolopts;
u32 opts1_mask;
@@ -2197,64 +2200,33 @@ DECLARE_RTL_COND(rtl_reset_counters_cond)
return RTL_R32(CounterAddrLow) & CounterReset;
}
-static struct rtl8169_counters *rtl8169_map_counters(struct net_device *dev,
- dma_addr_t *paddr,
- u32 counter_cmd)
+static int rtl8169_cmd_counters(struct net_device *dev, u32 counter_cmd)
{
struct rtl8169_private *tp = netdev_priv(dev);
void __iomem *ioaddr = tp->mmio_addr;
- struct device *d = &tp->pci_dev->dev;
- struct rtl8169_counters *counters;
+ dma_addr_t paddr = tp->counters_map;
u32 cmd;
- counters = dma_alloc_coherent(d, sizeof(*counters), paddr, GFP_KERNEL);
- if (counters) {
- RTL_W32(CounterAddrHigh, (u64)*paddr >> 32);
- cmd = (u64)*paddr & DMA_BIT_MASK(32);
- RTL_W32(CounterAddrLow, cmd);
- RTL_W32(CounterAddrLow, cmd | counter_cmd);
- }
- return counters;
-}
+ RTL_W32(CounterAddrHigh, (u64)paddr >> 32);
+ cmd = (u64)paddr & DMA_BIT_MASK(32);
+ RTL_W32(CounterAddrLow, cmd);
+ RTL_W32(CounterAddrLow, cmd | counter_cmd);
-static void rtl8169_unmap_counters (struct net_device *dev,
- dma_addr_t paddr,
- struct rtl8169_counters *counters)
-{
- struct rtl8169_private *tp = netdev_priv(dev);
- void __iomem *ioaddr = tp->mmio_addr;
- struct device *d = &tp->pci_dev->dev;
-
- RTL_W32(CounterAddrLow, 0);
- RTL_W32(CounterAddrHigh, 0);
-
- dma_free_coherent(d, sizeof(*counters), counters, paddr);
+ return rtl_udelay_loop_wait_low(tp, &rtl_reset_counters_cond, 10, 1000);
}
-static bool rtl8169_reset_counters(struct net_device *dev)
+static int rtl8169_reset_counters(struct net_device *dev)
{
struct rtl8169_private *tp = netdev_priv(dev);
- struct rtl8169_counters *counters;
- dma_addr_t paddr;
- bool ret = true;
/*
* Versions prior to RTL_GIGA_MAC_VER_19 don't support resetting the
* tally counters.
*/
if (tp->mac_version < RTL_GIGA_MAC_VER_19)
- return true;
-
- counters = rtl8169_map_counters(dev, &paddr, CounterReset);
- if (!counters)
- return false;
-
- if (!rtl_udelay_loop_wait_low(tp, &rtl_reset_counters_cond, 10, 1000))
- ret = false;
-
- rtl8169_unmap_counters(dev, paddr, counters);
+ return -EINVAL;
- return ret;
+ return rtl8169_cmd_counters(dev, CounterReset);
}
DECLARE_RTL_COND(rtl_counters_cond)
@@ -2264,44 +2236,30 @@ DECLARE_RTL_COND(rtl_counters_cond)
return RTL_R32(CounterAddrLow) & CounterDump;
}
-static bool rtl8169_update_counters(struct net_device *dev)
+static int rtl8169_update_counters(struct net_device *dev)
{
struct rtl8169_private *tp = netdev_priv(dev);
void __iomem *ioaddr = tp->mmio_addr;
- struct rtl8169_counters *counters;
- dma_addr_t paddr;
- bool ret = true;
/*
* Some chips are unable to dump tally counters when the receiver
* is disabled.
*/
if ((RTL_R8(ChipCmd) & CmdRxEnb) == 0)
- return true;
-
- counters = rtl8169_map_counters(dev, &paddr, CounterDump);
- if (!counters)
- return false;
-
- if (rtl_udelay_loop_wait_low(tp, &rtl_counters_cond, 10, 1000))
- memcpy(&tp->counters, counters, sizeof(*counters));
- else
- ret = false;
-
- rtl8169_unmap_counters(dev, paddr, counters);
+ return -EINVAL;
- return ret;
+ return rtl8169_cmd_counters(dev, CounterDump);
}
-static bool rtl8169_init_counter_offsets(struct net_device *dev)
+static int rtl_init_counter_offsets(struct net_device *dev)
{
struct rtl8169_private *tp = netdev_priv(dev);
struct rtl8169_counters *counters = tp->counters;
struct rtl8169_tc_offsets *offset = &tp->tc_offset;
- bool ret = false;
+ int rc;
/*
- * rtl8169_init_counter_offsets is called from rtl_open. On chip
+ * rtl_init_counter_offsets is called from rtl_open. On chip
* versions prior to RTL_GIGA_MAC_VER_19 the tally counters are only
* reset by a power cycle, while the counter values collected by the
* driver are reset at every driver unload/load cycle.
@@ -2310,27 +2268,29 @@ static bool rtl8169_init_counter_offsets(struct net_device *dev)
* values, we collect the initial values at first open(*) and use them
* as offsets to normalize the values returned by @get_stats64.
*
- * (*) We can't call rtl8169_init_counter_offsets from rtl_init_one
+ * (*) We can't call rtl_init_counter_offsets from rtl_init_one
* for the reason stated in rtl8169_update_counters; CmdRxEnb is only
* set at open time by rtl_hw_start.
*/
if (offset->inited)
- return true;
+ return 0;
/* If both, reset and update fail, propagate to caller. */
- if (rtl8169_reset_counters(dev))
- ret = true;
+ rc = rtl8169_reset_counters(dev);
+ if (!rc)
+ goto out;
- if (rtl8169_update_counters(dev))
- ret = true;
+ rc = rtl8169_update_counters(dev);
+ if (rc < 0)
+ goto out;
offset->tx_errors = counters->tx_errors;
offset->tx_multi_collision = counters->tx_multi_collision;
offset->tx_aborted = counters->tx_aborted;
offset->inited = true;
-
- return ret;
+out:
+ return rc;
}
static void rtl8169_get_ethtool_stats(struct net_device *dev,
@@ -7674,8 +7634,8 @@ static int rtl8169_close(struct net_device *dev)
free_irq(pdev->irq, dev);
- kfree(tp->counters);
-
+ dma_free_coherent(&pdev->dev, sizeof(*tp->counters), tp->counters,
+ tp->counters_map);
dma_free_coherent(&pdev->dev, R8169_RX_RING_BYTES, tp->RxDescArray,
tp->RxPhyAddr);
dma_free_coherent(&pdev->dev, R8169_TX_RING_BYTES, tp->TxDescArray,
@@ -7720,7 +7680,8 @@ static int rtl_open(struct net_device *dev)
if (!tp->RxDescArray)
goto err_free_tx_0;
- tp->counters = kmalloc(sizeof(*tp->counters), GFP_KERNEL);
+ tp->counters = dma_alloc_coherent(&pdev->dev, sizeof(*tp->counters),
+ &tp->counters_map, GFP_KERNEL);
if (!tp->counters)
goto err_free_rx_1;
@@ -7742,8 +7703,6 @@ static int rtl_open(struct net_device *dev)
rtl_lock_work(tp);
- set_bit(RTL_FLAG_TASK_ENABLED, tp->wk.flags);
-
napi_enable(&tp->napi);
rtl8169_init_phy(dev, tp);
@@ -7754,8 +7713,22 @@ static int rtl_open(struct net_device *dev)
rtl_hw_start(dev);
- if (!rtl8169_init_counter_offsets(dev))
- netif_warn(tp, hw, dev, "counter reset/update failed\n");
+ retval = rtl_init_counter_offsets(dev);
+ if (retval < 0) {
+ /*
+ * Late error but the current thread is still in control:
+ * - deferred work could have been scheduled - and it could
+ * be actually waiting for its mutex to be released - but
+ * we still haven't allowed it to perform real work.
+ * - transmit timeout timer can't run either.
+ */
+ rtl8169_hw_reset(tp);
+ rtl_pll_power_down(tp);
+ rtl_unlock_work(tp);
+ goto err_napi_disable_4;
+ }
+
+ set_bit(RTL_FLAG_TASK_ENABLED, tp->wk.flags);
netif_start_queue(dev);
@@ -7768,11 +7741,16 @@ static int rtl_open(struct net_device *dev)
out:
return retval;
+err_napi_disable_4:
+ napi_disable(&tp->napi);
+ cancel_work_sync(&tp->wk.work);
+ free_irq(pdev->irq, dev);
err_release_fw_3:
rtl_release_firmware(tp);
rtl8169_rx_clear(tp);
err_free_counters_2:
- kfree(tp->counters);
+ dma_free_coherent(&pdev->dev, sizeof(*tp->counters), tp->counters,
+ tp->counters_map);
tp->counters = NULL;
err_free_rx_1:
dma_free_coherent(&pdev->dev, R8169_RX_RING_BYTES, tp->RxDescArray,
--
2.4.3
--
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