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

[Vladimir Sokolovsky]

On 09/23/2011 09:37 PM, Mike Marciniszyn wrote:
> 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


Done,

Regards,
Vladimir

>
> 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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