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net: alx: switch to pci_alloc_irq_vectors
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Remove the deprecated pci_enable_msix API in favour of its successor,
and make sure to handle errors during IRQ setup properly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
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@davem330
Christoph Hellwig authored and davem330 committed Apr 11, 2017
1 parent c6606a8 commit f3297f6
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Showing 2 changed files with 54 additions and 80 deletions.
6 changes: 0 additions & 6 deletions drivers/net/ethernet/atheros/alx/alx.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -102,17 +102,13 @@ struct alx_napi {

#define ALX_MAX_NAPIS 8

#define ALX_FLAG_USING_MSIX BIT(0)
#define ALX_FLAG_USING_MSI BIT(1)

struct alx_priv {
struct net_device *dev;

struct alx_hw hw;

/* msi-x vectors */
int num_vec;
struct msix_entry *msix_entries;

/* all descriptor memory */
struct {
Expand All @@ -139,8 +135,6 @@ struct alx_priv {

u16 msg_enable;

int flags;

/* protects hw.stats */
spinlock_t stats_lock;
};
Expand Down
128 changes: 54 additions & 74 deletions drivers/net/ethernet/atheros/alx/main.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -314,7 +314,7 @@ static int alx_poll(struct napi_struct *napi, int budget)
napi_complete_done(&np->napi, work);

/* enable interrupt */
if (alx->flags & ALX_FLAG_USING_MSIX) {
if (alx->hw.pdev->msix_enabled) {
alx_mask_msix(hw, np->vec_idx, false);
} else {
spin_lock_irqsave(&alx->irq_lock, flags);
Expand Down Expand Up @@ -811,7 +811,7 @@ static void alx_config_vector_mapping(struct alx_priv *alx)
u32 tbl[2] = {0, 0};
int i, vector, idx, shift;

if (alx->flags & ALX_FLAG_USING_MSIX) {
if (alx->hw.pdev->msix_enabled) {
/* tx mappings */
for (i = 0, vector = 1; i < alx->num_txq; i++, vector++) {
idx = txq_vec_mapping_shift[i * 2];
Expand All @@ -828,45 +828,35 @@ static void alx_config_vector_mapping(struct alx_priv *alx)
alx_write_mem32(hw, ALX_MSI_ID_MAP, 0);
}

static bool alx_enable_msix(struct alx_priv *alx)
static int alx_enable_msix(struct alx_priv *alx)
{
int i, err, num_vec, num_txq, num_rxq;
int err, num_vec, num_txq, num_rxq;

num_txq = min_t(int, num_online_cpus(), ALX_MAX_TX_QUEUES);
num_rxq = 1;
num_vec = max_t(int, num_txq, num_rxq) + 1;

alx->msix_entries = kcalloc(num_vec, sizeof(struct msix_entry),
GFP_KERNEL);
if (!alx->msix_entries) {
netdev_warn(alx->dev, "Allocation of msix entries failed!\n");
return false;
}

for (i = 0; i < num_vec; i++)
alx->msix_entries[i].entry = i;

err = pci_enable_msix(alx->hw.pdev, alx->msix_entries, num_vec);
err = pci_alloc_irq_vectors(alx->hw.pdev, num_vec, num_vec,
PCI_IRQ_MSIX);
if (err) {
kfree(alx->msix_entries);
netdev_warn(alx->dev, "Enabling MSI-X interrupts failed!\n");
return false;
return err;
}

alx->num_vec = num_vec;
alx->num_napi = num_vec - 1;
alx->num_txq = num_txq;
alx->num_rxq = num_rxq;

return true;
return err;
}

static int alx_request_msix(struct alx_priv *alx)
{
struct net_device *netdev = alx->dev;
int i, err, vector = 0, free_vector = 0;

err = request_irq(alx->msix_entries[0].vector, alx_intr_msix_misc,
err = request_irq(pci_irq_vector(alx->hw.pdev, 0), alx_intr_msix_misc,
0, netdev->name, alx);
if (err)
goto out_err;
Expand All @@ -889,55 +879,39 @@ static int alx_request_msix(struct alx_priv *alx)
sprintf(np->irq_lbl, "%s-unused", netdev->name);

np->vec_idx = vector;
err = request_irq(alx->msix_entries[vector].vector,
err = request_irq(pci_irq_vector(alx->hw.pdev, vector),
alx_intr_msix_ring, 0, np->irq_lbl, np);
if (err)
goto out_free;
}
return 0;

out_free:
free_irq(alx->msix_entries[free_vector++].vector, alx);
free_irq(pci_irq_vector(alx->hw.pdev, free_vector++), alx);

vector--;
for (i = 0; i < vector; i++)
free_irq(alx->msix_entries[free_vector++].vector,
free_irq(pci_irq_vector(alx->hw.pdev,free_vector++),
alx->qnapi[i]);

out_err:
return err;
}

static void alx_init_intr(struct alx_priv *alx, bool msix)
static int alx_init_intr(struct alx_priv *alx)
{
if (msix) {
if (alx_enable_msix(alx))
alx->flags |= ALX_FLAG_USING_MSIX;
}
int ret;

if (!(alx->flags & ALX_FLAG_USING_MSIX)) {
alx->num_vec = 1;
alx->num_napi = 1;
alx->num_txq = 1;
alx->num_rxq = 1;

if (!pci_enable_msi(alx->hw.pdev))
alx->flags |= ALX_FLAG_USING_MSI;
}
}

static void alx_disable_advanced_intr(struct alx_priv *alx)
{
if (alx->flags & ALX_FLAG_USING_MSIX) {
kfree(alx->msix_entries);
pci_disable_msix(alx->hw.pdev);
alx->flags &= ~ALX_FLAG_USING_MSIX;
}
ret = pci_alloc_irq_vectors(alx->hw.pdev, 1, 1,
PCI_IRQ_MSI | PCI_IRQ_LEGACY);
if (ret)
return ret;

if (alx->flags & ALX_FLAG_USING_MSI) {
pci_disable_msi(alx->hw.pdev);
alx->flags &= ~ALX_FLAG_USING_MSI;
}
alx->num_vec = 1;
alx->num_napi = 1;
alx->num_txq = 1;
alx->num_rxq = 1;
return 0;
}

static void alx_irq_enable(struct alx_priv *alx)
Expand All @@ -950,10 +924,11 @@ static void alx_irq_enable(struct alx_priv *alx)
alx_write_mem32(hw, ALX_IMR, alx->int_mask);
alx_post_write(hw);

if (alx->flags & ALX_FLAG_USING_MSIX)
if (alx->hw.pdev->msix_enabled) {
/* enable all msix irqs */
for (i = 0; i < alx->num_vec; i++)
alx_mask_msix(hw, i, false);
}
}

static void alx_irq_disable(struct alx_priv *alx)
Expand All @@ -965,13 +940,13 @@ static void alx_irq_disable(struct alx_priv *alx)
alx_write_mem32(hw, ALX_IMR, 0);
alx_post_write(hw);

if (alx->flags & ALX_FLAG_USING_MSIX) {
if (alx->hw.pdev->msix_enabled) {
for (i = 0; i < alx->num_vec; i++) {
alx_mask_msix(hw, i, true);
synchronize_irq(alx->msix_entries[i].vector);
synchronize_irq(pci_irq_vector(alx->hw.pdev, i));
}
} else {
synchronize_irq(alx->hw.pdev->irq);
synchronize_irq(pci_irq_vector(alx->hw.pdev, 0));
}
}

Expand All @@ -981,8 +956,11 @@ static int alx_realloc_resources(struct alx_priv *alx)

alx_free_rings(alx);
alx_free_napis(alx);
alx_disable_advanced_intr(alx);
alx_init_intr(alx, false);
pci_free_irq_vectors(alx->hw.pdev);

err = alx_init_intr(alx);
if (err)
return err;

err = alx_alloc_napis(alx);
if (err)
Expand All @@ -1004,7 +982,7 @@ static int alx_request_irq(struct alx_priv *alx)

msi_ctrl = (hw->imt >> 1) << ALX_MSI_RETRANS_TM_SHIFT;

if (alx->flags & ALX_FLAG_USING_MSIX) {
if (alx->hw.pdev->msix_enabled) {
alx_write_mem32(hw, ALX_MSI_RETRANS_TIMER, msi_ctrl);
err = alx_request_msix(alx);
if (!err)
Expand All @@ -1016,20 +994,20 @@ static int alx_request_irq(struct alx_priv *alx)
goto out;
}

if (alx->flags & ALX_FLAG_USING_MSI) {
if (alx->hw.pdev->msi_enabled) {
alx_write_mem32(hw, ALX_MSI_RETRANS_TIMER,
msi_ctrl | ALX_MSI_MASK_SEL_LINE);
err = request_irq(pdev->irq, alx_intr_msi, 0,
err = request_irq(pci_irq_vector(pdev, 0), alx_intr_msi, 0,
alx->dev->name, alx);
if (!err)
goto out;

/* fall back to legacy interrupt */
alx->flags &= ~ALX_FLAG_USING_MSI;
pci_disable_msi(alx->hw.pdev);
pci_free_irq_vectors(alx->hw.pdev);
}

alx_write_mem32(hw, ALX_MSI_RETRANS_TIMER, 0);
err = request_irq(pdev->irq, alx_intr_legacy, IRQF_SHARED,
err = request_irq(pci_irq_vector(pdev, 0), alx_intr_legacy, IRQF_SHARED,
alx->dev->name, alx);
out:
if (!err)
Expand All @@ -1042,18 +1020,15 @@ static int alx_request_irq(struct alx_priv *alx)
static void alx_free_irq(struct alx_priv *alx)
{
struct pci_dev *pdev = alx->hw.pdev;
int i, vector = 0;
int i;

if (alx->flags & ALX_FLAG_USING_MSIX) {
free_irq(alx->msix_entries[vector++].vector, alx);
free_irq(pci_irq_vector(pdev, 0), alx);
if (alx->hw.pdev->msix_enabled) {
for (i = 0; i < alx->num_napi; i++)
free_irq(alx->msix_entries[vector++].vector,
alx->qnapi[i]);
} else {
free_irq(pdev->irq, alx);
free_irq(pci_irq_vector(pdev, i + 1), alx->qnapi[i]);
}

alx_disable_advanced_intr(alx);
pci_free_irq_vectors(pdev);
}

static int alx_identify_hw(struct alx_priv *alx)
Expand Down Expand Up @@ -1221,7 +1196,12 @@ static int __alx_open(struct alx_priv *alx, bool resume)
{
int err;

alx_init_intr(alx, true);
err = alx_enable_msix(alx);
if (err < 0) {
err = alx_init_intr(alx);
if (err)
return err;
}

if (!resume)
netif_carrier_off(alx->dev);
Expand Down Expand Up @@ -1264,7 +1244,7 @@ static int __alx_open(struct alx_priv *alx, bool resume)
alx_free_rings(alx);
alx_free_napis(alx);
out_disable_adv_intr:
alx_disable_advanced_intr(alx);
pci_free_irq_vectors(alx->hw.pdev);
return err;
}

Expand Down Expand Up @@ -1637,11 +1617,11 @@ static void alx_poll_controller(struct net_device *netdev)
struct alx_priv *alx = netdev_priv(netdev);
int i;

if (alx->flags & ALX_FLAG_USING_MSIX) {
if (alx->hw.pdev->msix_enabled) {
alx_intr_msix_misc(0, alx);
for (i = 0; i < alx->num_txq; i++)
alx_intr_msix_ring(0, alx->qnapi[i]);
} else if (alx->flags & ALX_FLAG_USING_MSI)
} else if (alx->hw.pdev->msi_enabled)
alx_intr_msi(0, alx);
else
alx_intr_legacy(0, alx);
Expand Down Expand Up @@ -1783,7 +1763,7 @@ static int alx_probe(struct pci_dev *pdev, const struct pci_device_id *ent)

netdev->netdev_ops = &alx_netdev_ops;
netdev->ethtool_ops = &alx_ethtool_ops;
netdev->irq = pdev->irq;
netdev->irq = pci_irq_vector(pdev, 0);
netdev->watchdog_timeo = ALX_WATCHDOG_TIME;

if (ent->driver_data & ALX_DEV_QUIRK_MSI_INTX_DISABLE_BUG)
Expand Down

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