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authorMike Marciniszyn <mike.marciniszyn@qlogic.com>2012-01-12 21:29:59 -0500
committerRoland Dreier <roland@purestorage.com>2012-01-27 10:03:38 -0800
commitb6bfefb0410dc49853bccd9673ead896d317c082 (patch)
tree28f767fddce244d327386a71f256d6ba585a9cf5 /drivers/infiniband
parent0f3696eb21ef39b7bb7ea7d0160e925904309281 (diff)
downloadop-kernel-dev-b6bfefb0410dc49853bccd9673ead896d317c082.zip
op-kernel-dev-b6bfefb0410dc49853bccd9673ead896d317c082.tar.gz
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>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r--drivers/infiniband/hw/qib/qib_pcie.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/qib/qib_pcie.c b/drivers/infiniband/hw/qib/qib_pcie.c
index f695061..0fde788 100644
--- a/drivers/infiniband/hw/qib/qib_pcie.c
+++ b/drivers/infiniband/hw/qib/qib_pcie.c
@@ -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.
* 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_PARM_DESC(pcie_caps, "Max PCIe tuning: Payload (0..3), ReadReq (4..7)");
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