[PATCH RFC 40/77] ixgbevf: Update MSI/MSI-X interrupts enablement code
From: Alexander Gordeev <hidden>
Date: 2013-10-02 16:59:13
Also in:
linux-ide, linux-mips, linux-pci, linux-rdma, linux-s390, linux-scsi, linuxppc-dev, lkml
Subsystem:
intel ethernet drivers, networking drivers, the rest · Maintainers:
Tony Nguyen, Przemek Kitszel, 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> --- drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 18 +++++++----------- 1 files changed, 7 insertions(+), 11 deletions(-)
diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index fa0537a..d506a01 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c@@ -1749,8 +1749,7 @@ void ixgbevf_reset(struct ixgbevf_adapter *adapter) static int ixgbevf_acquire_msix_vectors(struct ixgbevf_adapter *adapter, int vectors) { - int err = 0; - int vector_threshold; + int err, vector_threshold; /* We'll want at least 2 (vector_threshold): * 1) TxQ[0] + RxQ[0] handler
@@ -1763,18 +1762,15 @@ static int ixgbevf_acquire_msix_vectors(struct ixgbevf_adapter *adapter, * Right now, we simply care about how many we'll get; we'll * set them up later while requesting irq's. */ - while (vectors >= vector_threshold) { - err = pci_enable_msix(adapter->pdev, adapter->msix_entries, - vectors); - if (!err || err < 0) /* Success or a nasty failure. */ - break; - else /* err == number of vectors we should try again with */ - vectors = err; - } + err = pci_msix_table_size(adapter->pdev); + if (err < 0) + return err; + vectors = min(vectors, err); if (vectors < vector_threshold) - err = -ENOSPC; + return -ENOSPC; + err = pci_enable_msix(adapter->pdev, adapter->msix_entries, vectors); if (err) { dev_err(&adapter->pdev->dev, "Unable to allocate MSI-X interrupts\n");
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1.7.7.6