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>

diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index d5aa3b8c9f33b999184cce1044e06a2e88244595..56736cd5f3fef359fcd3f8a5b7d731c3e2b13d5a 100644 (file)
--- 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,
 };