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r8169: improve interrupt handling

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This patch improves few aspects of interrupt handling:
- update to current interrupt allocation API
  (use pci_alloc_irq_vectors() instead of deprecated pci_enable_msi())
- this implicitly will allocate a MSI-X interrupt if available
- get rid of flag RTL_FEATURE_MSI
- remove some dead code, intentionally disabling (unreliable) MSI
  being partially available on old PCI chips.

The patch works fine on a RTL8168evl (chip version 34) and on a
RTL8169SB (chip version 04).

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Heiner Kallweit 2018-02-24 16:53:23 +01:00 committed by David S. Miller
parent a52b839752
commit 6c6aa15fde
1 changed files with 21 additions and 27 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

48
drivers/net/ethernet/realtek/r8169.c
View file

@ -736,8 +736,7 @@ struct ring_info {
};
enum features {
RTL_FEATURE_MSI = (1 << 0),
RTL_FEATURE_GMII = (1 << 1),
RTL_FEATURE_GMII = (1 << 0),
};
struct rtl8169_counters {
@ -7847,7 +7846,7 @@ static int rtl8169_close(struct net_device *dev)
cancel_work_sync(&tp->wk.work);
free_irq(pdev->irq, dev);
pci_free_irq(pdev, 0, dev);
dma_free_coherent(&pdev->dev, R8169_RX_RING_BYTES, tp->RxDescArray,
tp->RxPhyAddr);
@ -7903,9 +7902,8 @@ static int rtl_open(struct net_device *dev)
rtl_request_firmware(tp);
retval = request_irq(pdev->irq, rtl8169_interrupt,
(tp->features & RTL_FEATURE_MSI) ? 0 : IRQF_SHARED,
dev->name, dev);
retval = pci_request_irq(pdev, 0, rtl8169_interrupt, NULL, dev,
dev->name);
if (retval < 0)
goto err_release_fw_2;
@ -8253,7 +8251,7 @@ static const struct rtl_cfg_info {
.region = 2,
.align = 8,
.event_slow = SYSErr | LinkChg | RxOverflow,
.features = RTL_FEATURE_GMII | RTL_FEATURE_MSI,
.features = RTL_FEATURE_GMII,
.coalesce_info = rtl_coalesce_info_8168_8136,
.default_ver = RTL_GIGA_MAC_VER_11,
},
@ -8263,32 +8261,26 @@ static const struct rtl_cfg_info {
.align = 8,
.event_slow = SYSErr | LinkChg | RxOverflow | RxFIFOOver |
PCSTimeout,
.features = RTL_FEATURE_MSI,
.coalesce_info = rtl_coalesce_info_8168_8136,
.default_ver = RTL_GIGA_MAC_VER_13,
}
};
/* Cfg9346_Unlock assumed. */
static unsigned rtl_try_msi(struct rtl8169_private *tp,
const struct rtl_cfg_info *cfg)
static int rtl_alloc_irq(struct rtl8169_private *tp)
{
void __iomem *ioaddr = tp->mmio_addr;
unsigned msi = 0;
u8 cfg2;
unsigned int flags;
cfg2 = RTL_R8(Config2) & ~MSIEnable;
if (cfg->features & RTL_FEATURE_MSI) {
if (pci_enable_msi(tp->pci_dev)) {
netif_info(tp, hw, tp->dev, "no MSI. Back to INTx.\n");
} else {
cfg2 |= MSIEnable;
msi = RTL_FEATURE_MSI;
}
if (tp->mac_version <= RTL_GIGA_MAC_VER_06) {
RTL_W8(Cfg9346, Cfg9346_Unlock);
RTL_W8(Config2, RTL_R8(Config2) & ~MSIEnable);
RTL_W8(Cfg9346, Cfg9346_Lock);
flags = PCI_IRQ_LEGACY;
} else {
flags = PCI_IRQ_ALL_TYPES;
}
if (tp->mac_version <= RTL_GIGA_MAC_VER_06)
RTL_W8(Config2, cfg2);
return msi;
return pci_alloc_irq_vectors(tp->pci_dev, 1, 1, flags);
}
DECLARE_RTL_COND(rtl_link_list_ready_cond)
@ -8497,9 +8489,11 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
chipset = tp->mac_version;
tp->txd_version = rtl_chip_infos[chipset].txd_version;
RTL_W8(Cfg9346, Cfg9346_Unlock);
tp->features |= rtl_try_msi(tp, cfg);
RTL_W8(Cfg9346, Cfg9346_Lock);
rc = rtl_alloc_irq(tp);
if (rc < 0) {
netif_err(tp, probe, dev, "Can't allocate interrupt\n");
return rc;
}
/* override BIOS settings, use userspace tools to enable WOL */
__rtl8169_set_wol(tp, 0);