BMC/Intel-BMC/linux.git/drivers/block/aoe/aoenet.c, branch dev

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: 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: whitespace cleanup

2012-12-18T01:15:24+00:00

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

aoe: print warning regarding a common reason for dropped transmits

2012-12-18T01:15:23+00:00

Dropped transmits are not common, but when they do occur, increasing the transmit queue length often helps. Signed-off-by: Ed Cashin Cc: Dan Carpenter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

aoe: update copyright year in touched files

2012-10-05T18:05:28+00:00

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

aoe: remove unused code and add cosmetic improvements

2012-10-05T18:05:27+00:00

This change removes some unused code and attempts to increase code consistency. Signed-off-by: Ed Cashin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

aoe: use a kernel thread for transmissions

2012-10-05T18:05:25+00:00

The dev_queue_xmit function needs to have interrupts enabled, so the most simple way to get the locking right but still fulfill that requirement is to use a process that can call dev_queue_xmit serially over queued transmissions. Signed-off-by: Ed Cashin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

aoe: kernel thread handles I/O completions for simple locking

2012-10-05T18:05:24+00:00

Make the frames the aoe driver uses to track the relationship between bios and packets more flexible and detached, so that they can be passed to an "aoe_ktio" thread for completion of I/O. The frames are handled much like skbs, with a capped amount of preallocation so that real-world use cases are likely to run smoothly and degenerate gracefully even under memory pressure. Decoupling I/O completion from the receive path and serializing it in a process makes it easier to think about the correctness of the locking in the driver, especially in the case of a remote MAC address becoming unusable. [dan.carpenter@oracle.com: cleanup an allocation a bit] Signed-off-by: Ed Cashin Signed-off-by: Dan Carpenter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

aoe: for performance support larger packet payloads

2012-10-05T18:05:24+00:00

tAdd adds the ability to work with large packets composed of a number of segments, using the scatter gather feature of the block layer (biovecs) and the network layer (skb frag array). The motivation is the performance gained by using a packet data payload greater than a page size and by using the network card's scatter gather feature. Users of the out-of-tree aoe driver already had these changes, but since early 2011, they have complained of increased memory utilization and higher CPU utilization during heavy writes.[1] The commit below appears related, as it disables scatter gather on non-IP protocols inside the harmonize_features function, even when the NIC supports sg. commit f01a5236bd4b140198fbcc550f085e8361fd73fa Author: Jesse Gross Date: Sun Jan 9 06:23:31 2011 +0000 net offloading: Generalize netif_get_vlan_features(). With that regression in place, transmits always linearize sg AoE packets, but in-kernel users did not have this patch. Before 2.6.38, though, these changes were working to allow sg to increase performance. 1. http://www.spinics.net/lists/linux-mm/msg15184.html Signed-off-by: Ed Cashin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds