On Fri, Sep 16, 2016 at 07:54:52AM -0700, Steve Wise wrote:
> When processing a REG_MR work request, if fw supports the
> FW_RI_NSMR_TPTE_WR work request, and if the page list for this
> registration is <= 2 pages, and the current state of the mr is INVALID,
> then use FW_RI_NSMR_TPTE_WR to pass down a fully populated TPTE for FW
> to write.  This avoids FW having to do an async read of the TPTE blocking
> the SQ until the read completes.
> To know if the current MR state is INVALID or not, iw_cxgb4 must track the
> state of each fastreg MR.  The c4iw_mr struct state is updated as REG_MR
> and LOCAL_INV WRs are posted and completed, when a reg_mr is destroyed,
> and when RECV completions are processed that include a local invalidation.
> This optimization increases small IO IOPS for both iSER and NVMF.
> Signed-off-by: Steve Wise <sw...@opengridcomputing.com>
> ---


> +                           struct ib_reg_wr *wr, struct c4iw_mr *mhp,
> +                           u8 *len16)
> +{
> +     __be64 *p = (__be64 *)fr->pbl;
> +
> +     fr->r2 = cpu_to_be32(0);

Is there any difference between the line above and "fr->r2 = 0"?

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