out of cdregister() and daregister(), which are run from interrupt context.
The sysctl code does blocking mallocs (M_WAITOK), which causes problems
if malloc(9) actually needs to sleep.
The eventual fix for this issue will involve moving the CAM probe process
inside a kernel thread. For now, though, I have fixed the issue by moving
dynamic sysctl variable creation for these two drivers to a task queue
running in a kernel thread.
The existing task queues (taskqueue_swi and taskqueue_swi_giant) run in
software interrupt handlers, which wouldn't fix the problem at hand. So I
have created a new task queue, taskqueue_thread, that runs inside a kernel
thread. (It also runs outside of Giant -- clients must explicitly acquire
and release Giant in their taskqueue functions.)
scsi_cd.c: Remove sysctl variable creation code from cdregister(), and
move it to a new function, cdsysctlinit(). Queue
cdsysctlinit() to the taskqueue_thread taskqueue once we
have fully registered the cd(4) driver instance.
scsi_da.c: Remove sysctl variable creation code from daregister(), and
move it to move it to a new function, dasysctlinit().
Queue dasysctlinit() to the taskqueue_thread taskqueue once
we have fully registered the da(4) instance.
taskqueue.h: Declare the new taskqueue_thread taskqueue, update some
comments.
subr_taskqueue.c:
Create the new kernel thread taskqueue. This taskqueue
runs outside of Giant, so any functions queued to it would
need to explicitly acquire/release Giant if they need it.
cd.4: Update the cd(4) man page to talk about the minimum command
size sysctl/loader tunable. Also note that the changer
variables are available as loader tunables as well.
da.4: Update the da(4) man page to cover the retry_count,
default_timeout and minimum_cmd_size sysctl variables/loader
tunables. Remove references to /dev/r???, they aren't used
any longer.
cd.9: Update the cd(9) man page to describe the CD_Q_10_BYTE_ONLY
quirk.
taskqueue.9: Update the taskqueue(9) man page to describe the new thread
task queue, and the taskqueue_swi_giant queue.
MFC after: 3 days
large to huge amounts of small or medium sized receive buffers. The problem
with these situations is that they eat up the available DMA address space
very quickly when using mbufs or even mbuf clusters. Additionally this
facility provides a direct mapping between 32-bit integers and these buffers.
This is needed for devices originally designed for 32-bit systems. Ususally
the virtual address of the buffer is used as a handle to find the buffer as
soon as it is returned by the card. This does not work for 64-bit machines
and hence this mapping is needed.
Remove a reference to the defunct macro M_COPY_PKTHDR;
document the new functions m_dup_pkthdr() and m_move_pkthdr(),
and the macro variant of the latter, M_MOVE_PKTHDR().
- tagging plaintext "mbuf", "mbuf cluster", and "mbuf chain"
with .Vt (variable type) since all of them are ways of managing
data, i.e., they can be seen as data types;
- using .Vt/.Va instead of .Li (literal) where appropriate;
- tagging plaintext words that actually refer to function arguments
with .Fa.
Suggested by: ru
bus_dmamap_sync() by OR'ing them together.
- Don't document what BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE and
BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE is supposed to do when
passed to bus_dmamap_sync(). There are other possible combinations
and the reader just needs to know what the individual flags do and
that he can combine different DMA operations.
- Use .An when listing authors.
Reviewed by: hmp
discipline to Random Early Detection (RED) in the future. The same para
incorrectly spelt ``Random Early Detection'' as ``Random Early Drop''.
While I am there, nuke IF_ENQ_DROP from the list of functions. More
work will be done on this, since some of the functions like
if_enq_drop() and if_queue_drop() were replaced with one function
called if_handoff() that does the job of enqueing the packet and
updating interface statistics as necessary.
Reviewed by: wollman
Approved by: des (mentor)
MFC after: 1 day
It currently supports the PMC Sierra Lite, Ultra and 622 chips and
the IDT 77105. The driver handles media options and state in a consistent
manner for ATM drivers. The next commit to the midway driver will make
it use utopia.
PCI bus interface. I have made some modifications to this manual
page, so it looks a bit different from the original version that
was posted to me.
Submitted by: Bruce M. Simpson <bms@spc.org>
Reviewed by: imp, mdodd (early copy)
Approved by: des (mentor)
MFC after: 3 days
extended attribute.
EINVAL can also reflect an invalid namespace for either a get
or set operation on EAs.
Obtained from: TrustedBSD Project
Sponsored by: DARPA, Network Associates Laboratories
VOP_GETEXTATTR() to retrieve the attribute name list on some file
systems, and note that this will be replaced with its own VOP
in due course.
Pointed out by: Dominic Giampaolo <dbg@apple.com>
- Nuke markup indicators for editors.
- Bump the date
- Use mdoc(7) specifiers for marking up defines, etc.
- Update the prototypes
- Flash out the description
- Cleanup english, spelling and grammar
- Update .Xr's
- Add following SEE ALSOs: uio(9), uma(9), vput(9), vref(9)
- Reorder sections to be in agreement with mdoc(7)
- Add FILES section
- Update Copyright and AUTHORS section.
Approved by: des (mentor)
Nuke incorrect usage of .Ar; replace it with .Vt, .Va or .Fa appropriately.
The .Ar mdoc(7) specifier should only be used when displaying command line
arguments.
Approved by: des (mentor)
- remove '-*- nroff -*-'
- bump the date
- nuke outdated ``struct vnode''
(it is just better to lookup the struct in the header)
- nuke ``enum vtype'' and related junk
- add a one line about ``struct vnode''
- use .Va instead of .Dv for vnode struct fields
Approved by: des (mentor), re (bmah)
Reviewed by: arch@, mentor
This manpage should really have only one short description (.Nd);
if anyone could come up with a wording suitable for both conversion
and decoding/encoding functions, that would unbreak the whatis(1)
output for this manpage.
Approved by: re (blanket)
description.
- Remove some bogus commas.
- Use the past tense when referring to the removal of the sleep() function
since it happened quite a while ago and since the previous sentence in the
paragraph already uses the past tense.
Approved by: re (rwatson)
datagrams have a LIST of multicast group memberships...". On -CURRENT, that
LIST is actually a TAILQ. Note that -STABLE still uses a LIST
PR: 50426
Submitted by: Scott Mitchell <scott+freebsd@fishballoon.org>
separate man page. Document new device_is_attached there and remove that
new man page too.
Connect device_get_name to build, and install a link for
device_get_nameunit.
strangely nobody noticed this yet...
While beeing here also correct the following:
- list missing macros in the header
- document MALLOC_DEFINE and MALLOC_DECLARE in the SYNOPSIS section
- document additional include requirements for MALLOC_DEFINE
- M_NOWAIT is not 0 anymore
- remove rotted diagnostic messages
with vnode interlocks held.
Emphasize that users need to be careful with malloc flags versus mbuf
flags.
Remove stale portion in vnode.9 about v_tag. We don't have it anylonger.
Submitted by: Hiten Pandya <hiten@unixdaemons.com>
