From: Roland Dreier Date: Fri, 16 May 2008 21:58:44 +0000 (-0700) Subject: IB/mthca: Fix max_sge value returned by query_device X-Git-Tag: v2.6.26-rc4~58^2~4 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=12103dca52e79e23afe2fbcaf3d9e7fc9ceb6b18;p=pandora-kernel.git IB/mthca: Fix max_sge value returned by query_device The mthca driver returns the maximum number of scatter/gather entries returned by the firmware as the max_sge value when device properties are queried. However, the firmware also reports a limit on the maximum descriptor size allowed, and because mthca takes into account the worst case send request overhead when checking whether to allow a QP to be created, the largest number of scatter/gather entries that can be used with mthca may be limited by the maximum descriptor size rather than just by the actual s/g entry limit. This means that applications cannot actually create QPs with max_send_sge equal to the limit returned by ib_query_device(). Fix this by checking if the maximum descriptor size imposes a lower limit and if so returning that lower limit. Signed-off-by: Roland Dreier --- Reading git-diff-tree failed