linux-toradex.git/drivers/block/aoe/aoe.h, branch v4.17

aoe: use ktime_t instead of timeval

2018-01-17T15:41:07+00:00

'struct frame' uses two variables to store the sent timestamp - 'struct
timeval' and jiffies. jiffies is used to avoid discrepancies caused by
updates to system time. 'struct timeval' is deprecated because it uses
32-bit representation for seconds which will overflow in year 2038.

This patch does the following:
- Replace the use of 'struct timeval' and jiffies with ktime_t, which
  is the recommended type for timestamping
- ktime_t provides both long range (like jiffies) and high resolution
  (like timeval). Using ktime_get (monotonic time) instead of wall-clock
  time prevents any discprepancies caused by updates to system time.

[updates by Arnd below]
The original patch from Tina never went anywhere as we discussed how
to keep the impact on performance minimal. I've started over now but
arrived at basically the same patch that she had originally, except for
an slightly improved tsince_hr() function. I'm making it more robust
against overflows, and also optimize explicitly for the common case
in which a frame is less than 4.2 seconds old, using only a 32-bit
division in that case.

This should make the new version more efficient than the old code,
since we replace the existing two 32-bit division in do_gettimeofday()
plus one multiplication with a single single 32-bit division in
tsince_hr() and drop the double bookkeeping. It's also more efficient
than the ktime_get_us() API we discussed before, since that would
also rely on multiple divisions.

Link: https://lists.linaro.org/pipermail/y2038/2015-May/000276.html
Signed-off-by: Tina Ruchandani 
Cc: Ed Cashin 
Signed-off-by: Arnd Bergmann 
Signed-off-by: Jens Axboe

aoe: Convert to immutable biovecs

2013-11-24T06:33:52+00:00

Now that we've got a mechanism for immutable biovecs -
bi_iter.bi_bvec_done - we need to convert drivers to use primitives that
respect it instead of using the bvec array directly.

The aoe code no longer has to manually iterate over partial bvecs, so
some struct members go away - other struct members are effectively
renamed:

buf->resid	-> buf->iter.bi_size
buf->sector	-> buf->iter.bi_sector

f->bcnt		-> f->iter.bi_size
f->lba		-> f->iter.bi_sector

Signed-off-by: Kent Overstreet 
Cc: Jens Axboe 
Cc: "Ed L. Cashin"

aoe: update internal version number to 85

2013-09-11T22:59:26+00:00

Signed-off-by: Ed Cashin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

aoe: add AoE-target files to debugfs

2013-09-11T22:59:23+00:00

Signed-off-by: Ed Cashin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

aoe: update internal version number to v83

2013-07-03T23:08:05+00:00

Signed-off-by: Ed Cashin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

aoe: update copyright date

2013-07-03T23:08:05+00:00

Signed-off-by: Ed Cashin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

aoe: perform I/O completions in parallel

2013-07-03T23:08:05+00:00

Some users have a large AoE target while others like to use many AoE
targets at the same time.  In the latter case, there is an opportunity to
greatly improve aggregate throughput by allowing different threads to
complete the I/O associated with each target.  For 36 targets, 4 KiB read
throughput roughly doubles, for example, with these changes in place.

Signed-off-by: Ed Cashin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

aoe: update internal version number to 81

2012-12-18T01:15:26+00:00

This version number is printed to the console on module initialization
and is available in sysfs, which is where the userland aoe-version tool
looks for it.

Signed-off-by: Ed Cashin 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

aoe: allow comma separator in aoe_iflist value

2012-12-18T01:15:26+00:00

By default, the aoe driver uses any ethernet interface for AoE, but the
aoe_iflist module parameter provides a convenient way to limit AoE
traffic to a specific list of local network interfaces.

This change allows a list to be specified using the comma character as a
separator.  For example,

  modprobe aoe aoe_iflist=eth2,eth3

Before, it was inconvenient to get the quoting right in shell scripts
when setting aoe_iflist to have more than one network interface.

Signed-off-by: Ed Cashin 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

aoe: use dynamic number of remote ports for AoE storage target

2012-12-18T01:15:25+00:00

Many AoE targets have four or fewer network ports, but some existing
storage devices have many, and the AoE protocol sets no limit.

This patch allows the use of more than eight remote MAC addresses per AoE
target, while reducing the amount of memory used by the aoe driver in
cases where there are many AoE targets with fewer than eight MAC addresses
each.

Signed-off-by: Ed Cashin 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds