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IB/qib: Roll back PCIe tuning change 

Commit 8d4548f2b ("IB/qib: Default some module parameters optimally")
introduced an issue with older root complexes.  They cannot handle the
pcie_caps of 0x51 (MaxReadReq 4096, MaxPayload=256).

A typical diagnostic in this situation reported by syslog contains
the text:

  [PCIe Poisoned TLP][Send DMA memory read]

Restore the module paramter default to zero with will avoid any
changes in the root complex.

Reviewed-by: Mark Debbage <mark.debbage@qlogic.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Mike Marciniszyn 2012-01-12 21:29:59 -05:00 committed by Roland Dreier
parent 0f3696eb21
commit b6bfefb041
1 changed files with 1 additions and 1 deletions
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2
drivers/infiniband/hw/qib/qib_pcie.c
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@ -560,7 +560,7 @@ static int qib_tune_pcie_coalesce(struct qib_devdata *dd)
* BIOS may not set PCIe bus-utilization parameters for best performance. * BIOS may not set PCIe bus-utilization parameters for best performance.
* Check and optionally adjust them to maximize our throughput. * Check and optionally adjust them to maximize our throughput.
*/ */
static int qib_pcie_caps = 0x51; static int qib_pcie_caps;
module_param_named(pcie_caps, qib_pcie_caps, int, S_IRUGO); module_param_named(pcie_caps, qib_pcie_caps, int, S_IRUGO);
MODULE_PARM_DESC(pcie_caps, "Max PCIe tuning: Payload (0..3), ReadReq (4..7)"); MODULE_PARM_DESC(pcie_caps, "Max PCIe tuning: Payload (0..3), ReadReq (4..7)");