[PATCH RFC 29/77] cxgb4vf: Update MSI/MSI-X interrupts enablement code
From: Alexander Gordeev <hidden>
Date: 2013-10-02 17:25:39
Also in:
linux-ide, linux-mips, linux-pci, linux-rdma, linux-s390, linux-scsi, lkml, netdev
Subsystem:
cxgb4vf ethernet driver (cxgb4vf), networking drivers, the rest · Maintainers:
Potnuri Bharat Teja, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
As result of recent re-design of the MSI/MSI-X interrupts enabling pattern this driver has to be updated to use the new technique to obtain a optimal number of MSI/MSI-X interrupts required. Signed-off-by: Alexander Gordeev <redacted> --- .../net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c | 49 ++++++++++++-------- 1 files changed, 29 insertions(+), 20 deletions(-)
diff --git a/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c b/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c
index 11cbce1..48bb33b 100644
--- a/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c@@ -2437,13 +2437,10 @@ static void reduce_ethqs(struct adapter *adapter, int n) */ static int enable_msix(struct adapter *adapter) { - int i, err, want, need; + int i, err, want, need, nqsets; struct msix_entry entries[MSIX_ENTRIES]; struct sge *s = &adapter->sge; - for (i = 0; i < MSIX_ENTRIES; ++i) - entries[i].entry = i; - /* * We _want_ enough MSI-X interrupts to cover all of our "Queue Sets" * plus those needed for our "extras" (for example, the firmware
@@ -2453,26 +2450,38 @@ static int enable_msix(struct adapter *adapter) */ want = s->max_ethqsets + MSIX_EXTRAS; need = adapter->params.nports + MSIX_EXTRAS; - while ((err = pci_enable_msix(adapter->pdev, entries, want)) >= need) - want = err; - if (err == 0) { - int nqsets = want - MSIX_EXTRAS; - if (nqsets < s->max_ethqsets) { - dev_warn(adapter->pdev_dev, "only enough MSI-X vectors" - " for %d Queue Sets\n", nqsets); - s->max_ethqsets = nqsets; - if (nqsets < s->ethqsets) - reduce_ethqs(adapter, nqsets); - } - for (i = 0; i < want; ++i) - adapter->msix_info[i].vec = entries[i].vector; - } else if (err > 0) { + err = pci_msix_table_size(adapter->pdev); + if (err < 0) + return err; + + want = min(want, err); + if (want < need) { dev_info(adapter->pdev_dev, "only %d MSI-X vectors left," " not using MSI-X\n", err); - err = -ENOSPC; + return -ENOSPC; } - return err; + + BUG_ON(want > ARRAY_SIZE(entries)); + for (i = 0; i < want; ++i) + entries[i].entry = i; + + err = pci_enable_msix(adapter->pdev, entries, want); + if (err) + return err; + + nqsets = want - MSIX_EXTRAS; + if (nqsets < s->max_ethqsets) { + dev_warn(adapter->pdev_dev, "only enough MSI-X vectors" + " for %d Queue Sets\n", nqsets); + s->max_ethqsets = nqsets; + if (nqsets < s->ethqsets) + reduce_ethqs(adapter, nqsets); + } + for (i = 0; i < want; ++i) + adapter->msix_info[i].vec = entries[i].vector; + + return 0; } static const struct net_device_ops cxgb4vf_netdev_ops = {
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1.7.7.6