From patchwork Wed Oct 2 10:49:24 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Gordeev X-Patchwork-Id: 279904 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 09A612C040C for ; Thu, 3 Oct 2013 03:02:14 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753281Ab3JBRCM (ORCPT ); Wed, 2 Oct 2013 13:02:12 -0400 Received: from 221-186-24-89.in-addr.arpa ([89.24.186.221]:25464 "EHLO dhcp-26-207.brq.redhat.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1753274Ab3JBRCL (ORCPT ); Wed, 2 Oct 2013 13:02:11 -0400 Received: from dhcp-26-207.brq.redhat.com (localhost [127.0.0.1]) by dhcp-26-207.brq.redhat.com (8.14.5/8.14.5) with ESMTP id r92AxoDi002751; Wed, 2 Oct 2013 12:59:50 +0200 Received: (from agordeev@localhost) by dhcp-26-207.brq.redhat.com (8.14.5/8.14.5/Submit) id r92AxmWw002750; Wed, 2 Oct 2013 12:59:48 +0200 From: Alexander Gordeev To: linux-kernel@vger.kernel.org Cc: Alexander Gordeev , Bjorn Helgaas , Ralf Baechle , Michael Ellerman , Benjamin Herrenschmidt , Martin Schwidefsky , Ingo Molnar , Tejun Heo , Dan Williams , Andy King , Jon Mason , Matt Porter , linux-pci@vger.kernel.org, linux-mips@linux-mips.org, linuxppc-dev@lists.ozlabs.org, linux390@de.ibm.com, linux-s390@vger.kernel.org, x86@kernel.org, linux-ide@vger.kernel.org, iss_storagedev@hp.com, linux-nvme@lists.infradead.org, linux-rdma@vger.kernel.org, netdev@vger.kernel.org, e1000-devel@lists.sourceforge.net, linux-driver@qlogic.com, Solarflare linux maintainers , "VMware, Inc." , linux-scsi@vger.kernel.org Subject: [PATCH RFC 68/77] sfc: Update MSI/MSI-X interrupts enablement code Date: Wed, 2 Oct 2013 12:49:24 +0200 Message-Id: X-Mailer: git-send-email 1.7.7.6 In-Reply-To: References: Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org 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 --- drivers/net/ethernet/sfc/efx.c | 18 +++++++++++------- 1 files changed, 11 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c index 07c9bc4..184ef9f 100644 --- a/drivers/net/ethernet/sfc/efx.c +++ b/drivers/net/ethernet/sfc/efx.c @@ -1261,21 +1261,24 @@ static int efx_probe_interrupts(struct efx_nic *efx) n_channels += extra_channels; n_channels = min(n_channels, efx->max_channels); - for (i = 0; i < n_channels; i++) - xentries[i].entry = i; - rc = pci_enable_msix(efx->pci_dev, xentries, n_channels); - if (rc > 0) { + rc = pci_msix_table_size(efx->pci_dev); + if (rc < 0) + goto msi; + + if (rc < n_channels) { netif_err(efx, drv, efx->net_dev, "WARNING: Insufficient MSI-X vectors" " available (%d < %u).\n", rc, n_channels); netif_err(efx, drv, efx->net_dev, "WARNING: Performance may be reduced.\n"); - EFX_BUG_ON_PARANOID(rc >= n_channels); n_channels = rc; - rc = pci_enable_msix(efx->pci_dev, xentries, - n_channels); } + EFX_BUG_ON_PARANOID(n_channels > ARRAY_SIZE(xentries)); + for (i = 0; i < n_channels; i++) + xentries[i].entry = i; + + rc = pci_enable_msix(efx->pci_dev, xentries, n_channels); if (rc == 0) { efx->n_channels = n_channels; if (n_channels > extra_channels) @@ -1293,6 +1296,7 @@ static int efx_probe_interrupts(struct efx_nic *efx) efx_get_channel(efx, i)->irq = xentries[i].vector; } else { +msi: /* Fall back to single channel MSI */ efx->interrupt_mode = EFX_INT_MODE_MSI; netif_err(efx, drv, efx->net_dev,