linux-kernel - Re: [PATCH v6 0/5] PCI: Improve PCIe link status reporting

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Message-ID: <20180523214651.GE150632@bhelgaas-glaptop.roam.corp.google.com>
Date:   Wed, 23 May 2018 16:46:51 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Ganesh Goudar <ganeshgr@...lsio.com>,
        Michael Chan <michael.chan@...adcom.com>,
        Ariel Elior <ariel.elior@...ium.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     linux-pci@...r.kernel.org, everest-linux-l2@...ium.com,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Tal Gilboa <talgi@...lanox.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Jakub Kicinski <kubakici@...pl>
Subject: Re: [PATCH v6 0/5] PCI: Improve PCIe link status reporting

[+to Davem]

On Thu, May 03, 2018 at 03:00:07PM -0500, Bjorn Helgaas wrote:
> This is based on Tal's recent work to unify the approach for reporting PCIe
> link speed/width and whether the device is being limited by a slower
> upstream link.
> 
> The new pcie_print_link_status() interface appeared in v4.17-rc1; see
> 9e506a7b5147 ("PCI: Add pcie_print_link_status() to log link speed and
> whether it's limited").
> 
> That's a good way to replace use of pcie_get_minimum_link(), which gives
> misleading results when a path contains both a fast, narrow link and a
> slow, wide link: it reports the equivalent of a slow, narrow link.
> 
> This series removes the remaining uses of pcie_get_minimum_link() and then
> removes the interface itself.  I'd like to merge them all through the PCI
> tree to make the removal easy.
> 
> This does change the dmesg reporting of link speeds, and in the ixgbe case,
> it changes the reporting from KERN_WARN level to KERN_INFO.  If that's an
> issue, let's talk about it.  I'm hoping the reduce code size, improved
> functionality, and consistency across drivers is enough to make this
> worthwhile.
> 
> ---
> 
> Bjorn Helgaas (5):
>       bnx2x: Report PCIe link properties with pcie_print_link_status()
>       bnxt_en: Report PCIe link properties with pcie_print_link_status()
>       cxgb4: Report PCIe link properties with pcie_print_link_status()
>       ixgbe: Report PCIe link properties with pcie_print_link_status()
>       PCI: Remove unused pcie_get_minimum_link()
> 
> 
>  drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c |   23 ++-----
>  drivers/net/ethernet/broadcom/bnxt/bnxt.c        |   19 ------
>  drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c  |   75 ----------------------
>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c    |   47 --------------
>  drivers/pci/pci.c                                |   43 -------------
>  include/linux/pci.h                              |    2 -
>  6 files changed, 9 insertions(+), 200 deletions(-)

I applied all of these on pci/enumeration for v4.18.  If you'd rather take
them, Dave, let me know and I'll drop them.

I solicited more acks, but only heard from Jeff.