forked from Minki/linux
Staging: sxg: Make SXG driver use MSI-X interrupts if possible
Make Sahara SXG driver use MSI-X interrupts instead of line based interrupts if possible. In case of problems in getting MSI-X vectors or MSI-X not being supported, driver will fall back to use previous line based interrupts. Signed-off-by: LinSysSoft Sahara Team <saharaproj@linsyssoft.com> Signed-off-by: Mithlesh Thukral <mithlesh@linsyssoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Mithlesh Thukral
Greg Kroah-Hartman
parent
c5e5cf5a18
commit
1782199f96
@ -132,6 +132,9 @@ void sxg_free_sgl_buffers(struct adapter_t *adapter);
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void sxg_unmap_resources(struct adapter_t *adapter);
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void sxg_free_mcast_addrs(struct adapter_t *adapter);
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void sxg_collect_statistics(struct adapter_t *adapter);
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static int sxg_register_interrupt(struct adapter_t *adapter);
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static void sxg_remove_isr(struct adapter_t *adapter);
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static irqreturn_t sxg_isr(int irq, void *dev_id);
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#define XXXTODO 0
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@ -250,6 +253,131 @@ static struct sxg_trace_buffer LSxgTraceBuffer;
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#endif /* ATKDBG */
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static struct sxg_trace_buffer *SxgTraceBuffer = NULL;
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/*
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* MSI Related API's
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*/
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int sxg_register_intr(struct adapter_t *adapter);
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int sxg_enable_msi_x(struct adapter_t *adapter);
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int sxg_add_msi_isr(struct adapter_t *adapter);
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void sxg_remove_msix_isr(struct adapter_t *adapter);
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int sxg_set_interrupt_capability(struct adapter_t *adapter);
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int sxg_set_interrupt_capability(struct adapter_t *adapter)
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{
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int ret;
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ret = sxg_enable_msi_x(adapter);
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if (ret != STATUS_SUCCESS) {
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adapter->msi_enabled = FALSE;
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DBG_ERROR("sxg_set_interrupt_capability MSI-X Disable\n");
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} else {
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adapter->msi_enabled = TRUE;
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DBG_ERROR("sxg_set_interrupt_capability MSI-X Enable\n");
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}
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return ret;
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}
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int sxg_register_intr(struct adapter_t *adapter)
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{
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int ret = 0;
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if (adapter->msi_enabled) {
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ret = sxg_add_msi_isr(adapter);
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}
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else {
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DBG_ERROR("MSI-X Enable Failed. Using Pin INT\n");
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ret = sxg_register_interrupt(adapter);
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if (ret != STATUS_SUCCESS) {
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DBG_ERROR("sxg_register_interrupt Failed\n");
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}
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}
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return ret;
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}
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int sxg_enable_msi_x(struct adapter_t *adapter)
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{
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int ret;
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adapter->nr_msix_entries = 1;
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adapter->msi_entries = kmalloc(adapter->nr_msix_entries *
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sizeof(struct msix_entry),GFP_KERNEL);
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if (!adapter->msi_entries) {
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DBG_ERROR("%s:MSI Entries memory allocation Failed\n",__func__);
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return -ENOMEM;
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}
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memset(adapter->msi_entries, 0, adapter->nr_msix_entries *
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sizeof(struct msix_entry));
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ret = pci_enable_msix(adapter->pcidev, adapter->msi_entries,
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adapter->nr_msix_entries);
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if (ret) {
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DBG_ERROR("Enabling MSI-X with %d vectors failed\n",
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adapter->nr_msix_entries);
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/*Should try with less vector returned.*/
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kfree(adapter->msi_entries);
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return STATUS_FAILURE; /*MSI-X Enable failed.*/
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}
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return (STATUS_SUCCESS);
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}
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int sxg_add_msi_isr(struct adapter_t *adapter)
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{
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int ret,i;
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if (!adapter->intrregistered) {
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for (i=0; i<adapter->nr_msix_entries; i++) {
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ret = request_irq (adapter->msi_entries[i].vector,
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sxg_isr,
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IRQF_SHARED,
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adapter->netdev->name,
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adapter->netdev);
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if (ret) {
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DBG_ERROR("sxg: MSI-X request_irq (%s) "
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"FAILED [%x]\n", adapter->netdev->name,
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ret);
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return (ret);
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}
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}
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}
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adapter->msi_enabled = TRUE;
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adapter->intrregistered = 1;
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adapter->IntRegistered = TRUE;
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return (STATUS_SUCCESS);
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}
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void sxg_remove_msix_isr(struct adapter_t *adapter)
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{
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int i,vector;
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struct net_device *netdev = adapter->netdev;
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for(i=0; i< adapter->nr_msix_entries;i++)
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{
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vector = adapter->msi_entries[i].vector;
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DBG_ERROR("%s : Freeing IRQ vector#%d\n",__FUNCTION__,vector);
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free_irq(vector,netdev);
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}
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}
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static void sxg_remove_isr(struct adapter_t *adapter)
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{
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struct net_device *netdev = adapter->netdev;
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if (adapter->msi_enabled)
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sxg_remove_msix_isr(adapter);
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else
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free_irq(adapter->netdev->irq, netdev);
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}
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void sxg_reset_interrupt_capability(struct adapter_t *adapter)
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{
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if (adapter->msi_enabled) {
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pci_disable_msix(adapter->pcidev);
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kfree(adapter->msi_entries);
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adapter->msi_entries = NULL;
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}
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return;
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}
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/*
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* sxg_download_microcode
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*
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@ -462,7 +590,7 @@ static int sxg_allocate_resources(struct adapter_t *adapter)
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/* Windows tells us how many CPUs it plans to use for */
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/* RSS */
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RssIds = SXG_RSS_CPU_COUNT(adapter);
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IsrCount = adapter->MsiEnabled ? RssIds : 1;
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IsrCount = adapter->msi_enabled ? RssIds : 1;
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DBG_ERROR("%s Setup the spinlocks\n", __func__);
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@ -950,6 +1078,9 @@ static int sxg_entry_probe(struct pci_dev *pcidev,
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netdev->get_stats = sxg_get_stats;
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netdev->set_multicast_list = sxg_mcast_set_list;
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SET_ETHTOOL_OPS(netdev, &sxg_nic_ethtool_ops);
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err = sxg_set_interrupt_capability(adapter);
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if (err != STATUS_SUCCESS)
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DBG_ERROR("Cannot enable MSI-X capability\n");
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strcpy(netdev->name, "eth%d");
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/* strcpy(netdev->name, pci_name(pcidev)); */
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@ -1025,7 +1156,6 @@ static void sxg_disable_interrupt(struct adapter_t *adapter)
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adapter, adapter->InterruptsEnabled, 0, 0);
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/* For now, RSS is disabled with line based interrupts */
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ASSERT(adapter->RssEnabled == FALSE);
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ASSERT(adapter->MsiEnabled == FALSE);
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/* Turn off interrupts by writing to the icr register. */
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WRITE_REG(adapter->UcodeRegs[0].Icr, SXG_ICR(0, SXG_ICR_DISABLE), TRUE);
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@ -1053,7 +1183,6 @@ static void sxg_enable_interrupt(struct adapter_t *adapter)
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adapter, adapter->InterruptsEnabled, 0, 0);
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/* For now, RSS is disabled with line based interrupts */
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ASSERT(adapter->RssEnabled == FALSE);
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ASSERT(adapter->MsiEnabled == FALSE);
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/* Turn on interrupts by writing to the icr register. */
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WRITE_REG(adapter->UcodeRegs[0].Icr, SXG_ICR(0, SXG_ICR_ENABLE), TRUE);
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@ -1154,7 +1283,6 @@ static void sxg_handle_interrupt(struct adapter_t *adapter, int *work_done,
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adapter, adapter->IsrCopy[0], 0, 0);
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/* For now, RSS is disabled with line based interrupts */
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ASSERT(adapter->RssEnabled == FALSE);
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ASSERT(adapter->MsiEnabled == FALSE);
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adapter->IsrCopy[0] = adapter->Isr[0];
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adapter->Isr[0] = 0;
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@ -1197,7 +1325,6 @@ static int sxg_poll(struct napi_struct *napi, int budget)
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netif_rx_complete(napi);
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WRITE_REG(adapter->UcodeRegs[0].Isr, 0, TRUE);
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}
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return work_done;
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}
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@ -1845,7 +1972,6 @@ static int sxg_register_interrupt(struct adapter_t *adapter)
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adapter->intrregistered = 1;
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adapter->IntRegistered = TRUE;
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/* Disable RSS with line-based interrupts */
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adapter->MsiEnabled = FALSE;
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adapter->RssEnabled = FALSE;
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DBG_ERROR("sxg: %s AllocAdaptRsrcs adapter[%p] dev->irq[%x]\n",
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__func__, adapter, adapter->netdev->irq);
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@ -1919,9 +2045,9 @@ static int sxg_if_init(struct adapter_t *adapter)
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}
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DBG_ERROR("\n");
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}
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status = sxg_register_interrupt(adapter);
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status = sxg_register_intr(adapter);
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if (status != STATUS_SUCCESS) {
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DBG_ERROR("sxg_if_init: sxg_register_interrupt FAILED %x\n",
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DBG_ERROR("sxg_if_init: sxg_register_intr FAILED %x\n",
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status);
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sxg_deregister_interrupt(adapter);
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return (status);
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@ -2081,8 +2207,8 @@ int sxg_second_open(struct net_device * dev)
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SXG_ENABLE_ALL_INTERRUPTS(adapter);
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netif_carrier_on(dev);
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spin_unlock_irqrestore(&sxg_global.driver_lock, sxg_global.flags);
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sxg_register_interrupt(adapter);
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spin_unlock_irqrestore(&sxg_global.driver_lock, sxg_global.flags);
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return (STATUS_SUCCESS);
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}
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@ -2099,6 +2225,7 @@ static void __devexit sxg_entry_remove(struct pci_dev *pcidev)
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/* Deallocate Resources */
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unregister_netdev(dev);
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sxg_reset_interrupt_capability(adapter);
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sxg_free_resources(adapter);
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ASSERT(adapter);
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@ -2133,7 +2260,7 @@ static int sxg_entry_halt(struct net_device *dev)
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unsigned long flags;
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RssIds = SXG_RSS_CPU_COUNT(adapter);
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IsrCount = adapter->MsiEnabled ? RssIds : 1;
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IsrCount = adapter->msi_enabled ? RssIds : 1;
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napi_disable(&adapter->napi);
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spin_lock_irqsave(&sxg_global.driver_lock, sxg_global.flags);
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@ -2147,9 +2274,6 @@ static int sxg_entry_halt(struct net_device *dev)
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DBG_ERROR("sxg: %s (%s) set adapter[%p] state to ADAPT_DOWN(%d)\n",
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__func__, dev->name, adapter, adapter->state);
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DBG_ERROR("sxg: %s (%s) EXIT\n", __func__, dev->name);
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DBG_ERROR("sxg: %s EXIT\n", __func__);
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/* Disable interrupts */
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SXG_DISABLE_ALL_INTERRUPTS(adapter);
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@ -2196,11 +2320,13 @@ static int sxg_entry_halt(struct net_device *dev)
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memset(adapter->XmtRingZeroIndex, 0, sizeof(u32));
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spin_unlock_irqrestore(&adapter->XmtZeroLock, flags);
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for (i = 0; i < SXG_MAX_RSS; i++) {
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adapter->NextEvent[i] = 0;
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}
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atomic_set(&adapter->pending_allocations, 0);
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adapter->intrregistered = 0;
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sxg_remove_isr(adapter);
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DBG_ERROR("sxg: %s (%s) EXIT\n", __FUNCTION__, dev->name);
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return (STATUS_SUCCESS);
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}
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@ -3451,9 +3577,8 @@ void sxg_unmap_resources(struct adapter_t *adapter)
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void sxg_free_resources(struct adapter_t *adapter)
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{
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u32 RssIds, IsrCount;
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struct net_device *netdev = adapter->netdev;
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RssIds = SXG_RSS_CPU_COUNT(adapter);
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IsrCount = adapter->MsiEnabled ? RssIds : 1;
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IsrCount = adapter->msi_enabled ? RssIds : 1;
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if (adapter->BasicAllocations == FALSE) {
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/*
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@ -3463,9 +3588,6 @@ void sxg_free_resources(struct adapter_t *adapter)
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return;
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}
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/* Free Irq */
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free_irq(adapter->netdev->irq, netdev);
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if (!(IsListEmpty(&adapter->AllRcvBlocks))) {
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sxg_free_rcvblocks(adapter);
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}
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@ -3877,7 +3999,7 @@ static int sxg_initialize_adapter(struct adapter_t *adapter)
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adapter, 0, 0, 0);
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RssIds = 1; /* XXXTODO SXG_RSS_CPU_COUNT(adapter); */
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IsrCount = adapter->MsiEnabled ? RssIds : 1;
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IsrCount = adapter->msi_enabled ? RssIds : 1;
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/*
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* Sanity check SXG_UCODE_REGS structure definition to
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@ -676,7 +676,7 @@ struct adapter_t {
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u32 DumpCmdRunning:1; /* Dump command in progress */
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u32 DebugRunning:1; /* AGDB debug in progress */
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u32 JumboEnabled:1; /* Jumbo frames enabled */
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u32 MsiEnabled:1; /* MSI interrupt enabled */
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u32 msi_enabled:1; /* MSI interrupt enabled */
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u32 RssEnabled:1; /* RSS Enabled */
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u32 FailOnBadEeprom:1; /* Fail on Bad Eeprom */
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u32 DiagStart:1; /* Init adapter for diagnostic start */
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@ -709,6 +709,9 @@ struct adapter_t {
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/* PSXG_DUMP_CMD DumpBuffer; */ /* 68k - Cmd and Buffer */
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/* dma_addr_t PDumpBuffer; */ /* Physical address */
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/*#endif */ /* SXG_FAILURE_DUMP */
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/*MSI-X related data elements*/
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u32 nr_msix_entries;
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struct msix_entry *msi_entries;
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};
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#if SLIC_DUMP_ENABLED
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