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firewire: cdev: add PHY pinging

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This extends the FW_CDEV_IOC_SEND_PHY_PACKET ioctl() for /dev/fw* to be
useful for ping time measurements.  One application for it would be gap
count optimization in userspace that is based on ping times rather than
hop count.  (The latter is implemented in firewire-core itself but is
not applicable to beta PHYs that act as repeater.)

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Stefan Richter
2010-07-18 13:00:50 +02:00
parent bf54e1462b
commit cc550216ae
4 changed files with 18 additions and 4 deletions
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9
drivers/firewire/core-cdev.c
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@@ -1423,9 +1423,10 @@ static void outbound_phy_packet_callback(struct fw_packet *packet,
/* stale generation; cancelled; on certain controllers: no ack */
default: e->phy_packet.rcode = status; break;
}
e->phy_packet.data[0] = packet->timestamp;
queue_event(e->client, &e->event,
&e->phy_packet, sizeof(e->phy_packet), NULL, 0);
queue_event(e->client, &e->event, &e->phy_packet,
sizeof(e->phy_packet) + e->phy_packet.length, NULL, 0);
client_put(e->client);
}
@@ -1439,7 +1440,7 @@ static int ioctl_send_phy_packet(struct client *client, union ioctl_arg *arg)
if (!client->device->is_local)
return -ENOSYS;
e = kzalloc(sizeof(*e), GFP_KERNEL);
e = kzalloc(sizeof(*e) + 4, GFP_KERNEL);
if (e == NULL)
return -ENOMEM;
@@ -1453,6 +1454,8 @@ static int ioctl_send_phy_packet(struct client *client, union ioctl_arg *arg)
e->p.callback = outbound_phy_packet_callback;
e->phy_packet.closure = a->closure;
e->phy_packet.type = FW_CDEV_EVENT_PHY_PACKET_SENT;
if (is_ping_packet(a->data))
e->phy_packet.length = 4;
card->driver->send_request(card, &e->p);