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IB/hfi1: Ensure full Gen3 speed in a Gen4 system

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commit a9c3c4c597 upstream.

If an hfi1 card is inserted in a Gen4 systems, the driver will avoid the
gen3 speed bump and the card will operate at half speed.

This is because the driver avoids the gen3 speed bump when the parent bus
speed isn't identical to gen3, 8.0GT/s.  This is not compatible with gen4
and newer speeds.

Fix by relaxing the test to explicitly look for the lower capability
speeds which inherently allows for gen4 and all future speeds.

Fixes: 7724105686 ("IB/hfi1: add driver files")
Link: https://lore.kernel.org/r/20191101192059.106248.1699.stgit@awfm-01.aw.intel.com
Cc: <stable@vger.kernel.org>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: James Erwin <james.erwin@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
James Erwin 2019-11-01 15:20:59 -04:00 committed by Greg Kroah-Hartman
parent 1f3bbf9f0a
commit 6ec4a5498e
1 changed files with 3 additions and 1 deletions
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4
drivers/infiniband/hw/hfi1/pcie.c
View file

@ -331,7 +331,9 @@ int pcie_speeds(struct hfi1_devdata *dd)
/*
* bus->max_bus_speed is set from the bridge's linkcap Max Link Speed
*/
if (parent && dd->pcidev->bus->max_bus_speed != PCIE_SPEED_8_0GT) {
if (parent &&
(dd->pcidev->bus->max_bus_speed == PCIE_SPEED_2_5GT ||
dd->pcidev->bus->max_bus_speed == PCIE_SPEED_5_0GT)) {
dd_dev_info(dd, "Parent PCIe bridge does not support Gen3\n");
dd->link_gen3_capable = 0;
}