[ewg] IB/qib: patches from recent kernel.org submissions

[Mike Marciniszyn]

Vlad,

Please pull the following patches from
git.openfabrics.org/~mmarciniszyn/scm/linux-2.6.to_ofed

The kernel.org patches are just now hitting the lists.

Thanks!
Mike

commit a7f7c501f9cf0a1454323c5f6f8668be2ddf2b1d
Author: Mike Marciniszyn <mike.marciniszyn at qlogic.com>
Date:   Fri Sep 23 12:04:24 2011 -0400

    IB/qib: Add logic for affinity hint

    Call irq_set_affinity_hint to provide user mode programs
    like irqbalance the information to be able to distribute
    qib interrupts appropriately.

    The logic allocates all non-receive interrupts to the first
    CPU local to the HCA.  Receive interrupts are allocated round
    robin starting with the second CPU local to the HCA with
    potential wrap back to the second CPU.

    Signed-off-by: Mike Marciniszyn <mike.marciniszyn at qlogic.com>

commit 96ecdac8d78e2d20b32eb4ec50643bcb1c03f828
Author: Mike Marciniszyn <mike.marciniszyn at qlogic.com>
Date:   Fri Sep 23 11:10:49 2011 -0400

    IB/qib: Add irq name refinements

    This patch adds a refinement to the name registered with
    MSIX interrupts so that user level scripts can determine
    the device associated with the IRQs when there are
    multiple HCAs with a potentially different set of
    local CPUs.

    Signed-off-by: Mike Marciniszyn <mike.marciniszyn at qlogic.com>

commit d3d7ea0a142f1545f9bfbcd9e3bd47b7b2f9ce79
Author: Mike Marciniszyn <mike.marciniszyn at qlogic.com>
Date:   Fri Sep 23 10:59:03 2011 -0400

    IB/qib: remove s_lock around header validation

    Observation in qib_ruc_check_hdr() shows that the s_lock is not required
    in the normal case.   The r_lock is held in all cases, and protects
    the qp fields that are read.

    The s_lock will be needed to around the call to qib_migrate_qp() to
    insure that the send engine sees a consistent set of fields.

    Signed-off-by: Mike Marciniszyn <mike.marciniszyn at qlogic.com>

commit 6aeceea336753dfc6b2987594b228e65b3a46982
Author: Mike Marciniszyn <mike.marciniszyn at qlogic.com>
Date:   Fri Sep 23 10:46:13 2011 -0400

    IB/qib: memcpy optimizations

    The default memcpy used by qib_copy_sge() ends up being a rep movsb on x86_64,
    which is pretty slow.

    This fix adds an x86_64 specific routine that 1) probes for X86_FEATURE_REP_GOOD
    and 2) uses an inline asm routine builton rep movsq that testing has shown is
    better than the builtin memcpy for all cases up to 4K.  The probing routine is
    now called when the qib module is loaded to enable the optimization.   When
    X86_FEATURE_REP_GOOD is not set, the routine uses the kernel's unrolled __memcpy
    when the length is more than 64 and the builtin memcpy otherwise.

    This patch also adds the cache bypass copies from older releases.  Testing has
    shown that AMD cpus benefit with a 40% improvement in netperf/ipoib.

    The cache_bypass_copy module parameter can be used to enable on non-AMD
    CPUs.

    The qib_verbs_send_dma() and qib_copy_from_sge are also changed to use the
    memcpy_string_op() to improve packet delivery performance to the
    send engine.

    The existing copy as well as a new stub probe routine are maintained as weak
    symbols for other architectures.

    Signed-off-by: Mike Marciniszyn <mike.marciniszyn at qlogic.com>

commit 9ecf3abd1d880255e2f9be0e9714dcd49c97fede
Author: Mike Marciniszyn <mike.marciniszyn at qlogic.com>
Date:   Fri Sep 23 09:44:07 2011 -0400

    IB/qib: precompute timeout jiffies to optimize latency

    A new field is added to qib_qp called timeout_jiffies. It
    is initialized upon create and modify.

    The field is now used vs. the computation based on qp->timeout.

    Signed-off-by: Mike Marciniszyn <mike.marciniszyn at qlogic.com>

commit b718e7f17cc9fc9d31148ec046bf071bdd2c105d
Author: Mike Marciniszyn <mike.marciniszyn at qlogic.com>
Date:   Thu Sep 22 14:43:48 2011 -0400

    IB/qib: qpn lookup optimizations

    The heavy weight spinlock in qib_lookup_qpn() is replaced with
    the RCU locking mechanism.  The hash list itself is now accessed
    via jhash functions vs. the mod.

    The changes should benefit multiple receive contexts in different
    processors by not contending for the lock to just read the hash
    structures.

    The patch also adds a lookaside_qp (pointer) and a lookaside_qpn
    in the context.  The interrupt handler will test the current
    packet's qpn against lookaside_qpn if the lookaside_qp pointer
    is non-null.  The pointer is NULL'ed when the interrupt
    handler exits.

    Signed-off-by: Mike Marciniszyn <mike.marciniszyn at qlogic.com>

commit dd2e48e7c02c0925a5e603d1a9752d20b7e15ed3
Author: Mike Marciniszyn <mike.marciniszyn at qlogic.com>
Date:   Thu Sep 22 11:50:04 2011 -0400

    IB/qib: Eliminate divide/mod in converting idx to egr buf pointer

    The context init now saves a shift from rcvegrbufs_perchunk
    rcvegrbufs_perchunk_shift using ilog2.   A BUG_ON protects the
    power of 2 assumption.

    Signed-off-by: Mike Marciniszyn <mike.marciniszyn at qlogic.com>

commit 3eef5499db4d04aae5d10580b3735696957cd99d
Author: Mike Marciniszyn <mike.marciniszyn at qlogic.com>
Date:   Thu Sep 22 11:40:13 2011 -0400

    IB/qib: decode path mtu optimization

    Store both the encoded and decoded mtu in the qp structure as a minor
    optimization UC/RC receive routines.

    Signed-off-by: Mike Marciniszyn <mike.marciniszyn at qlogic.com>

commit 2871fc8a45df95c52cac9707e886383ec712a20e
Author: Mike Marciniszyn <mike.marciniszyn at qlogic.com>
Date:   Thu Sep 22 11:24:39 2011 -0400

    IB/qib: Optimize RC/UC code by IB operation

    The memset for zeroing the work completion had been unconditional.

    This patch removes the memset and moves the zeroing into the work
    completion with a more explicit field by field set.   With this patch,
    non-ONLY/non-LAST packets will avoid the overhead since they will
    not generate a completion.

    Signed-off-by: Mike Marciniszyn <mike.marciniszyn at qlogic.com>


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