From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Kirsher Subject: [net-next 06/18] fm10k: update fm10k_slot_warn to use pcie_get_minimum link Date: Tue, 15 Sep 2015 17:36:31 -0700 Message-ID: <1442363803-47237-7-git-send-email-jeffrey.t.kirsher@intel.com> References: <1442363803-47237-1-git-send-email-jeffrey.t.kirsher@intel.com> Cc: Jacob Keller , netdev@vger.kernel.org, nhorman@redhat.com, sassmann@redhat.com, jogreene@redhat.com, Jeff Kirsher To: davem@davemloft.net Return-path: Received: from mga03.intel.com ([134.134.136.65]:25583 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753284AbbIPAgt (ORCPT ); Tue, 15 Sep 2015 20:36:49 -0400 In-Reply-To: <1442363803-47237-1-git-send-email-jeffrey.t.kirsher@intel.com> Sender: netdev-owner@vger.kernel.org List-ID: From: Jacob Keller This is useful in cases where we connect to a slot at Gen3, but the slot is behind a bus which only connected at Gen2. This generally only happens when a PCIe switch is in the sequence of devices, and can be very confusing when you see slow performance with no obvious cause. I am aware this patch has a few lines that break 80 characters, but there does not seem to be a readable way to format them to less than 80 characters. Suggestions welcome. Signed-off-by: Jacob Keller Tested-by: Krishneil Singh Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/fm10k/fm10k_pci.c | 105 +++++++++++++++++++-------- 1 file changed, 76 insertions(+), 29 deletions(-) diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c index 8413ab5..2d87c32 100644 --- a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c +++ b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c @@ -1705,22 +1705,86 @@ static int fm10k_sw_init(struct fm10k_intfc *interface, static void fm10k_slot_warn(struct fm10k_intfc *interface) { - struct device *dev = &interface->pdev->dev; + enum pcie_link_width width = PCIE_LNK_WIDTH_UNKNOWN; + enum pci_bus_speed speed = PCI_SPEED_UNKNOWN; struct fm10k_hw *hw = &interface->hw; + int max_gts = 0, expected_gts = 0; - if (hw->mac.ops.is_slot_appropriate(hw)) + if (pcie_get_minimum_link(interface->pdev, &speed, &width) || + speed == PCI_SPEED_UNKNOWN || width == PCIE_LNK_WIDTH_UNKNOWN) { + dev_warn(&interface->pdev->dev, + "Unable to determine PCI Express bandwidth.\n"); return; + } + + switch (speed) { + case PCIE_SPEED_2_5GT: + /* 8b/10b encoding reduces max throughput by 20% */ + max_gts = 2 * width; + break; + case PCIE_SPEED_5_0GT: + /* 8b/10b encoding reduces max throughput by 20% */ + max_gts = 4 * width; + break; + case PCIE_SPEED_8_0GT: + /* 128b/130b encoding has less than 2% impact on throughput */ + max_gts = 8 * width; + break; + default: + dev_warn(&interface->pdev->dev, + "Unable to determine PCI Express bandwidth.\n"); + return; + } + + dev_info(&interface->pdev->dev, + "PCI Express bandwidth of %dGT/s available\n", + max_gts); + dev_info(&interface->pdev->dev, + "(Speed:%s, Width: x%d, Encoding Loss:%s, Payload:%s)\n", + (speed == PCIE_SPEED_8_0GT ? "8.0GT/s" : + speed == PCIE_SPEED_5_0GT ? "5.0GT/s" : + speed == PCIE_SPEED_2_5GT ? "2.5GT/s" : + "Unknown"), + hw->bus.width, + (speed == PCIE_SPEED_2_5GT ? "20%" : + speed == PCIE_SPEED_5_0GT ? "20%" : + speed == PCIE_SPEED_8_0GT ? "<2%" : + "Unknown"), + (hw->bus.payload == fm10k_bus_payload_128 ? "128B" : + hw->bus.payload == fm10k_bus_payload_256 ? "256B" : + hw->bus.payload == fm10k_bus_payload_512 ? "512B" : + "Unknown")); - dev_warn(dev, - "For optimal performance, a %s %s slot is recommended.\n", - (hw->bus_caps.width == fm10k_bus_width_pcie_x1 ? "x1" : - hw->bus_caps.width == fm10k_bus_width_pcie_x4 ? "x4" : - "x8"), - (hw->bus_caps.speed == fm10k_bus_speed_2500 ? "2.5GT/s" : - hw->bus_caps.speed == fm10k_bus_speed_5000 ? "5.0GT/s" : - "8.0GT/s")); - dev_warn(dev, - "A slot with more lanes and/or higher speed is suggested.\n"); + switch (hw->bus_caps.speed) { + case fm10k_bus_speed_2500: + /* 8b/10b encoding reduces max throughput by 20% */ + expected_gts = 2 * hw->bus_caps.width; + break; + case fm10k_bus_speed_5000: + /* 8b/10b encoding reduces max throughput by 20% */ + expected_gts = 4 * hw->bus_caps.width; + break; + case fm10k_bus_speed_8000: + /* 128b/130b encoding has less than 2% impact on throughput */ + expected_gts = 8 * hw->bus_caps.width; + break; + default: + dev_warn(&interface->pdev->dev, + "Unable to determine expected PCI Express bandwidth.\n"); + return; + } + + if (max_gts < expected_gts) { + dev_warn(&interface->pdev->dev, + "This device requires %dGT/s of bandwidth for optimal performance.\n", + expected_gts); + dev_warn(&interface->pdev->dev, + "A %sslot with x%d lanes is suggested.\n", + (hw->bus_caps.speed == fm10k_bus_speed_2500 ? "2.5GT/s " : + hw->bus_caps.speed == fm10k_bus_speed_5000 ? "5.0GT/s " : + hw->bus_caps.speed == fm10k_bus_speed_8000 ? "8.0GT/s " : ""), + hw->bus_caps.width); + } } /** @@ -1739,7 +1803,6 @@ static int fm10k_probe(struct pci_dev *pdev, { struct net_device *netdev; struct fm10k_intfc *interface; - struct fm10k_hw *hw; int err; err = pci_enable_device_mem(pdev); @@ -1783,7 +1846,6 @@ static int fm10k_probe(struct pci_dev *pdev, interface->netdev = netdev; interface->pdev = pdev; - hw = &interface->hw; interface->uc_addr = ioremap(pci_resource_start(pdev, 0), FM10K_UC_ADDR_SIZE); @@ -1825,21 +1887,6 @@ static int fm10k_probe(struct pci_dev *pdev, /* Register PTP interface */ fm10k_ptp_register(interface); - /* print bus type/speed/width info */ - dev_info(&pdev->dev, "(PCI Express:%s Width: %s Payload: %s)\n", - (hw->bus.speed == fm10k_bus_speed_8000 ? "8.0GT/s" : - hw->bus.speed == fm10k_bus_speed_5000 ? "5.0GT/s" : - hw->bus.speed == fm10k_bus_speed_2500 ? "2.5GT/s" : - "Unknown"), - (hw->bus.width == fm10k_bus_width_pcie_x8 ? "x8" : - hw->bus.width == fm10k_bus_width_pcie_x4 ? "x4" : - hw->bus.width == fm10k_bus_width_pcie_x1 ? "x1" : - "Unknown"), - (hw->bus.payload == fm10k_bus_payload_128 ? "128B" : - hw->bus.payload == fm10k_bus_payload_256 ? "256B" : - hw->bus.payload == fm10k_bus_payload_512 ? "512B" : - "Unknown")); - /* print warning for non-optimal configurations */ fm10k_slot_warn(interface); -- 2.4.3