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authorEd Cashin <ecashin@coraid.com>2012-12-17 16:03:34 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-17 17:15:23 -0800
commit90a2508d01845afbb3118615ce44d689cbb0e943 (patch)
treef0ccbdc043fbb192b7a17ca3ffc0667b7ab31111 /drivers/block/aoe/aoeblk.c
parentaa304fdefa568d63c862df7abe55d39811845c7c (diff)
downloadlwn-90a2508d01845afbb3118615ce44d689cbb0e943.tar.gz
lwn-90a2508d01845afbb3118615ce44d689cbb0e943.zip
aoe: "payload" sysfs file exports per-AoE-command data transfer size
The userland aoetools package includes an "aoe-stat" command that can display a "payload size" column when the aoe driver exports this information. Users can quickly see what amount of user data is transferred inside each AoE command on the network, network headers excluded. Signed-off-by: Ed Cashin <ecashin@coraid.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/block/aoe/aoeblk.c')
-rw-r--r--drivers/block/aoe/aoeblk.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index d5aa3b8c9f33..56736cd5f3fe 100644
--- a/drivers/block/aoe/aoeblk.c
+++ b/drivers/block/aoe/aoeblk.c
@@ -98,6 +98,14 @@ static ssize_t aoedisk_show_fwver(struct device *dev,
return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
}
+static ssize_t aoedisk_show_payload(struct device *dev,
+ struct device_attribute *attr, char *page)
+{
+ struct gendisk *disk = dev_to_disk(dev);
+ struct aoedev *d = disk->private_data;
+
+ return snprintf(page, PAGE_SIZE, "%lu\n", d->maxbcnt);
+}
static DEVICE_ATTR(state, S_IRUGO, aoedisk_show_state, NULL);
static DEVICE_ATTR(mac, S_IRUGO, aoedisk_show_mac, NULL);
@@ -106,12 +114,14 @@ static struct device_attribute dev_attr_firmware_version = {
.attr = { .name = "firmware-version", .mode = S_IRUGO },
.show = aoedisk_show_fwver,
};
+static DEVICE_ATTR(payload, S_IRUGO, aoedisk_show_payload, NULL);
static struct attribute *aoe_attrs[] = {
&dev_attr_state.attr,
&dev_attr_mac.attr,
&dev_attr_netif.attr,
&dev_attr_firmware_version.attr,
+ &dev_attr_payload.attr,
NULL,
};