> -----Original Message----- > From: Bjorn Helgaas [mailto:helgaas@xxxxxxxxxx] > Sent: Friday, April 13, 2018 7:07 AM > To: Jakub Kicinski <kubakici@xxxxx> > Cc: Tal Gilboa <talgi@xxxxxxxxxxxx>; Tariq Toukan <tariqt@xxxxxxxxxxxx>; > Keller, Jacob E <jacob.e.keller@xxxxxxxxx>; Ariel Elior <ariel.elior@xxxxxxxxxx>; > Ganesh Goudar <ganeshgr@xxxxxxxxxxx>; Kirsher, Jeffrey T > <jeffrey.t.kirsher@xxxxxxxxx>; everest-linux-l2@xxxxxxxxxx; intel-wired- > lan@xxxxxxxxxxxxxxxx; netdev@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > linux-pci@xxxxxxxxxxxxxxx > Subject: Re: [PATCH v5 05/14] PCI: Add pcie_print_link_status() to log link speed > and whether it's limited > > On Thu, Apr 12, 2018 at 09:32:49PM -0700, Jakub Kicinski wrote: > > On Fri, 30 Mar 2018 16:05:18 -0500, Bjorn Helgaas wrote: > > > + if (bw_avail >= bw_cap) > > > + pci_info(dev, "%d Mb/s available bandwidth (%s x%d link)\n", > > > + bw_cap, PCIE_SPEED2STR(speed_cap), width_cap); > > > + else > > > + pci_info(dev, "%d Mb/s available bandwidth, limited by %s x%d > link at %s (capable of %d Mb/s with %s x%d link)\n", > > > + bw_avail, PCIE_SPEED2STR(speed), width, > > > + limiting_dev ? pci_name(limiting_dev) : "<unknown>", > > > + bw_cap, PCIE_SPEED2STR(speed_cap), width_cap); > > > > I was just looking at using this new function to print PCIe BW for a > > NIC, but I'm slightly worried that there is nothing in the message that > > says PCIe... For a NIC some people may interpret the bandwidth as NIC > > bandwidth: > > > > [ 39.839989] nfp 0000:04:00.0: Netronome Flow Processor NFP4000/NFP6000 > PCIe Card Probe > > [ 39.848943] nfp 0000:04:00.0: 63.008 Gb/s available bandwidth (8 GT/s x8 link) > > [ 39.857146] nfp 0000:04:00.0: RESERVED BARs: 0.0: General/MSI-X SRAM, 0.1: > PCIe XPB/MSI-X PBA, 0.4: Explicit0, 0.5: Explicit1, fre4 > > > > It's not a 63Gbps NIC... I'm sorry if this was discussed before and I > > didn't find it. Would it make sense to add the "PCIe: " prefix to the > > message like bnx2x used to do? Like: > > > > nfp 0000:04:00.0: PCIe: 63.008 Gb/s available bandwidth (8 GT/s x8 link) > > I agree, that does look potentially confusing. How about this: > > nfp 0000:04:00.0: 63.008 Gb/s available PCIe bandwidth (8 GT/s x8 link) > > I did have to look twice at this before I remembered that we're > printing Gb/s (not GB/s). Most of the references I found on the web > use GB/s when talking about total PCIe bandwidth. > > But either way I think it's definitely worth mentioning PCIe > explicitly. I also agree printing PCIe explicitly is good. Thanks, Jake
