[PATCH RFC 46/77] mlx4: Update MSI/MSI-X interrupts enablement code
From: Alexander Gordeev <hidden>
Date: 2013-10-02 16:46:18
Also in:
linux-ide, linux-mips, linux-pci, linux-rdma, linux-s390, linux-scsi, linuxppc-dev, lkml
Subsystem:
mellanox mlx4 core vpi driver, networking drivers, the rest · Maintainers:
Tariq Toukan, 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/mellanox/mlx4/main.c | 17 ++++++++--------- 1 files changed, 8 insertions(+), 9 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
index 60c9f4f..377a5ea 100644
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c@@ -1852,8 +1852,16 @@ static void mlx4_enable_msi_x(struct mlx4_dev *dev) int i; if (msi_x) { + err = pci_msix_table_size(dev->pdev); + if (err < 0) + goto no_msi; + + /* Try if at least 2 vectors are available */ nreq = min_t(int, dev->caps.num_eqs - dev->caps.reserved_eqs, nreq); + nreq = min_t(int, nreq, err); + if (nreq < 2) + goto no_msi; entries = kcalloc(nreq, sizeof *entries, GFP_KERNEL); if (!entries)
@@ -1862,17 +1870,8 @@ static void mlx4_enable_msi_x(struct mlx4_dev *dev) for (i = 0; i < nreq; ++i) entries[i].entry = i; - retry: err = pci_enable_msix(dev->pdev, entries, nreq); if (err) { - /* Try again if at least 2 vectors are available */ - if (err > 1) { - mlx4_info(dev, "Requested %d vectors, " - "but only %d MSI-X vectors available, " - "trying again\n", nreq, err); - nreq = err; - goto retry; - } kfree(entries); goto no_msi; }
--
1.7.7.6