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

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Message-ID: <152537719056.62474.2571390812509425478.stgit@bhelgaas-glaptop.roam.corp.google.com>
Date:   Thu, 03 May 2018 15:00:07 -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>
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: [PATCH v6 0/5] PCI: Improve PCIe link status reporting

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(-)