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staging/rdma/hfi1: Fix xmit discard error weight

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Count only the errors that apply to xmit discards.  Update
the comment to better explain the limitations of the count.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Dean Luick 2016-02-18 11:12:08 -08:00 committed by Doug Ledford
parent 6b5c5213e5
commit 4c9e7aacb6
1 changed files with 21 additions and 5 deletions
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26
drivers/staging/rdma/hfi1/chip.c
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@ -5566,12 +5566,28 @@ static void handle_send_egress_err_info(struct hfi1_devdata *dd,
int weight, i;
/*
* Count all, in case multiple bits are set. Reminder:
* since there is only one info register for many sources,
* these may be attributed to the wrong VL if they occur
* too close together.
* Count all applicable bits as individual errors and
* attribute them to the packet that triggered this handler.
* This may not be completely accurate due to limitations
* on the available hardware error information. There is
* a single information register and any number of error
* packets may have occurred and contributed to it before
* this routine is called. This means that:
* a) If multiple packets with the same error occur before
* this routine is called, earlier packets are missed.
* There is only a single bit for each error type.
* b) Errors may not be attributed to the correct VL.
* The driver is attributing all bits in the info register
* to the packet that triggered this call, but bits
* could be an accumulation of different packets with
* different VLs.
* c) A single error packet may have multiple counts attached
* to it. There is no way for the driver to know if
* multiple bits set in the info register are due to a
* single packet or multiple packets. The driver assumes
* multiple packets.
*/
weight = hweight64(info);
weight = hweight64(info & PORT_DISCARD_EGRESS_ERRS);
for (i = 0; i < weight; i++) {
__count_port_discards(ppd);
if (vl >= 0 && vl < TXE_NUM_DATA_VL)