[Bug 265786] broadcom storage controller: bus_dmamap_load_ccb() is failing with EINPROGRESS for 1MB IOs

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 13 Oct 2022 08:41:19 UTC

--- Comment #2 from Chandrakanth Patil <chandrakanth.patil@broadcom.com> ---
(In reply to Warner Losh from comment #1)

Hi warner,

Below is the Bug ID link where you mentioned that increasing the maxphys will
resolve the issue: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240145

Couple of queries I have on your response:

1. when bus_dmamap_load_ccb() returns "EINPROGRESS" does it 
   mean DMA memory allocation is failing due to the unavailability of DMA
   and what course of action the driver should take after this. do we need to 
   return those IOs with specific error codes? so that those IOs could be re- 

2. Does it mean FreeBSD doesn't support 1MB IOs? in that do we need to reduce
   max transfer size to < 1MB? if yes, then what could be the correct max IO

NOTE: hardware supports a max transfer size of 1MB

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