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IB/ehca: Fix static rate if path faster than link
The formula would yield -1 if the path is faster than the link, which is wrong in a bad way (max throttling). Clamp to 0, which is the correct value. Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
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1 changed files with 6 additions and 2 deletions
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@ -76,8 +76,12 @@ int ehca_calc_ipd(struct ehca_shca *shca, int port,
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link = ib_width_enum_to_int(pa.active_width) * pa.active_speed;
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/* IPD = round((link / path) - 1) */
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*ipd = ((link + (path >> 1)) / path) - 1;
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if (path >= link)
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/* no need to throttle if path faster than link */
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*ipd = 0;
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else
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/* IPD = round((link / path) - 1) */
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*ipd = ((link + (path >> 1)) / path) - 1;
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return 0;
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}
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