linux/drivers/infiniband
Jack Morgenstein 59fef3b1e9 IB/mthca: Fix max_srq_sge returned by ib_query_device for Tavor devices
The driver allocates SRQ WQEs size with a power of 2 size both for
Tavor and for memfree. For Tavor, however, the hardware only requires
the WQE size to be a multiple of 16, not a power of 2, and the max
number of scatter-gather allowed is reported accordingly by the
firmware (and this is the value currently returned by
ib_query_device() and ibv_query_device()).

If the max number of scatter/gather entries reported by the FW is used
when creating an SRQ, the creation will fail for Tavor, since the
required WQE size will be increased to the next power of 2, which
turns out to be larger than the device permitted max WQE size (which
is not a power of 2).

This patch reduces the reported SRQ max wqe size so that it can be used
successfully in creating an SRQ on Tavor HCAs.

Signed-off-by: Jack Morgenstein <jackm@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
2006-04-12 11:42:30 -07:00
..
core IB/cache: Use correct pointer to calculate size 2006-04-10 13:17:43 -07:00
hw IB/mthca: Fix max_srq_sge returned by ib_query_device for Tavor devices 2006-04-12 11:42:30 -07:00
ulp IPoIB: Use spin_lock_irq() instead of spin_lock_irqsave() 2006-04-10 09:43:59 -07:00
Kconfig IB/ipath: kbuild infrastructure 2006-03-31 13:14:21 -08:00
Makefile IB/ipath: kbuild infrastructure 2006-03-31 13:14:21 -08:00