Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755219Ab3JBRZj (ORCPT ); Wed, 2 Oct 2013 13:25:39 -0400 Received: from 221-186-24-89.in-addr.arpa ([89.24.186.221]:26081 "EHLO dhcp-26-207.brq.redhat.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1754542Ab3JBRZf (ORCPT ); Wed, 2 Oct 2013 13:25:35 -0400 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 29/77] cxgb4vf: Update MSI/MSI-X interrupts enablement code Date: Wed, 2 Oct 2013 12:48:45 +0200 Message-Id: X-Mailer: git-send-email 1.7.7.6 In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2905 Lines: 91 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 --- .../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 = { -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/