buffers (ie, >4GB on amd64.)
The underlying problem was that PREREAD doesn't sync the mbuf
with the DMA memory (ie, bounce buffer), so the bounce buffer may
have had stale information. Thus it was always considering the
buffer completed and things just went off the rails.
This change does the following:
* Make ath_rx_pkt() always consume the mbuf somehow; it no longer
passes error mbufs (eg CRC errors, crypt errors, etc) back up
to the RX path to recycle. This means that a new mbuf is always
allocated each time, but it's cleaner.
* Push the RX buffer map/unmap to occur in the RX path, not
ath_rx_pkt(). Thus, ath_rx_pkt() now assumes (a) it has to consume
the mbuf somehow, and (b) that it's already been unmapped and
synced.
* For the legacy path, the descriptor isn't mapped, it comes out of
coherent, DMA memory anyway. So leave it there.
* For the EDMA path, the RX descriptor has to be cleared before
its passed to the hardware, so that when we check with
a POSTREAD sync, we actually get either a blank (not finished)
or a filled out descriptor (finished.) Otherwise we get stale
data in the DMA memory.
* .. so, for EDMA RX path, we need PREREAD|PREWRITE to sync the
data -> DMA memory, then POSTREAD|POSTWRITE to finish syncing
the DMA memory -> data.
* Whilst we're here, make sure that in EDMA buffer setup (ie,
bzero'ing the descriptor part) is done before the mbuf is
map/synched.
NOTE: there's been a lot of commits besides this one with regards to
tidying up the busdma handling in ath(4). Please check the recent
commit history.
Discussed with and thanks to: scottl
Tested:
* AR5416 (non-EDMA) on i386, with the DMA tag for the driver
set to 2^^30, not 2^^32, STA
* AR9580 (EDMA) on i386, as above, STA
* User - tested AR9380 on amd64 with 32GB RAM.
PR: kern/177530
most kernels before FreeBSD 9.0. Remove such modules and respective kernel
options: atadisk, ataraid, atapicd, atapifd, atapist, atapicam. Remove the
atacontrol utility and some man pages. Remove useless now options ATA_CAM.
No objections: current@, stable@
MFC after: never
done in ixgbe, thanks to Mike Karels for this fix. When exiting
promiscuous mode MPE bit was being unconditionally cleared, this
should not be done if we are in MAX multicast groups.
Allow boothowto and bootverbose to be set via kernel options, which
is useful on architectures that are unable to rely on a boot loader
to pass configuration variables to the kernel.
Submitted by: rwatson
in the pagedep and inodedep hash tables. An entry in the table is
skipped because 'pagedep_hash' and 'inodedep_hash' hold the size
of the hash tables - 1.
The chance that this would have any operational failure is extremely
unlikely. These funtions only need to find a single entry and are
only called when there are too many entries. The chance that they
would fail because all the entries are on the single skipped hash
chain are remote.
Submitted by: Pedro Martelletto
Reviewed by: kib
MFC after: 2 weeks
Introduce an explicit close of the output descriptor so that work done
on close is accounted for in the summary output triggered at exit
(implicit close()s occur after atexit() hooks).
This is useful because some devices such as cfi(4) may perform
signficant work after a close occurs (e.g. erasing and rewriting a
block of flash).
different ATA channels, required for acard and pc98 ATA controllers, block
access to second channels of both, hoping that one working channel is better
then none. I have an idea how that support could be implemented, but I have
no hardware to work on that.
MFC after: 1 week
Prior to r248571 spa_open was always called with a bare pool name,
but now it is called with a dataset name instead (spa_lookup handles
that).
So, when a ZFS root is mounted spa_open is called with a name of a root
dataset, which can very well be different from the pool name.
But zvol_create_minors should be called with the pool name, because it
performs a recursive traversal of all datasets under the name to find
all those that are volumes.
MFC after: 7 days
This is required because, in the radeon driver, we can't left-shift in a
central place, like it was done in the i915 driver.
Reviewed by: kib@, kan@, avg@
Tested by: kib@, avg@
vm_radix_topage(). This transformation eliminates some unnecessary
conditional branches from the inner loops of vm_radix_insert(),
vm_radix_lookup{,_ge,_le}(), and vm_radix_remove().
Simplify the control flow of vm_radix_lookup_{ge,le}().
Reviewed by: attilio (an earlier version)
Tested by: pho
Sponsored by: EMC / Isilon Storage Division
Use non-blocking I/O to write as much as the pipe will accept (often 64K,
but it can be as little as 4K), avoiding the need for the ugly PIPESIZE
constant. If PIPESIZE was set too high, a deadlock would occur.
copied in from userspace. This fixes instant panic when creating CTL LUN
on sparc64. Not a security problem, since the API is root-only.
Reviewed by: ken
Sponsored by: FreeBSD Foundation
before the TX path is being aborted.
Right now it's in the TDMA code and I can live with that; but it really
should get fixed.
I'll do a more thorough audit of this code soon.
* Don't use BUS_DMA_ALLOCNOW for descriptor DMA maps; we never use
bounce buffers for the descriptors themselves.
* Add some XXX's to mark where the ath_buf has its mbuf ripped from
underneath it without actually cleaning up the dmamap. I haven't
audited those particular code paths to see if the DMA map is guaranteed
to be setup there; I'll do that later.
* Print out a warning if the descdma tidyup code is given some descriptors
w/ maps to free. Ideally the owner will free the mbufs and unmap
the descriptors before freeing the descriptor/ath_buf pairs, but
right now that's not guaranteed to be done.
Reviewed by: scottl (BUS_DMA_ALLOCNOW tag)
