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authorStefan Richter <stefanr@s5r6.in-berlin.de>2010-07-18 13:00:50 +0200
committerStefan Richter <stefanr@s5r6.in-berlin.de>2010-07-23 13:36:28 +0200
commitcc550216ae9a2993ef3973464714dc1a39ab1f86 (patch)
tree62ffde836c83fe44b7a9edc01d00bcb9ad4f4ad6
parentbf54e1462b9192fdef7ea9e2bc44fdc16a4b87bc (diff)
firewire: cdev: add PHY pinging
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>
-rw-r--r--drivers/firewire/core-cdev.c9
-rw-r--r--drivers/firewire/core.h5
-rw-r--r--drivers/firewire/ohci.c3
-rw-r--r--include/linux/firewire-cdev.h5
4 files changed, 18 insertions, 4 deletions
diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c
index 0425dd5dfcd3..31863cf8b6c4 100644
--- a/drivers/firewire/core-cdev.c
+++ b/drivers/firewire/core-cdev.c
@@ -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);
diff --git a/drivers/firewire/core.h b/drivers/firewire/core.h
index 3102b6b63438..28621e44b111 100644
--- a/drivers/firewire/core.h
+++ b/drivers/firewire/core.h
@@ -234,4 +234,9 @@ void fw_fill_response(struct fw_packet *response, u32 *request_header,
void fw_send_phy_config(struct fw_card *card,
int node_id, int generation, int gap_count);
+static inline bool is_ping_packet(u32 *data)
+{
+ return (data[0] & 0xc0ffffff) == 0 && ~data[0] == data[1];
+}
+
#endif /* _FIREWIRE_CORE_H */
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 08afccc66333..5f6bb2c53808 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -1068,6 +1068,9 @@ static int at_context_queue_packet(struct context *ctx,
header[1] = cpu_to_le32(packet->header[0]);
header[2] = cpu_to_le32(packet->header[1]);
d[0].req_count = cpu_to_le16(12);
+
+ if (is_ping_packet(packet->header))
+ d[0].control |= cpu_to_le16(DESCRIPTOR_PING);
break;
case 4:
diff --git a/include/linux/firewire-cdev.h b/include/linux/firewire-cdev.h
index b87409160794..da0fec7e8dc0 100644
--- a/include/linux/firewire-cdev.h
+++ b/include/linux/firewire-cdev.h
@@ -294,7 +294,10 @@ struct fw_cdev_event_iso_resource {
* @length: Data length in bytes
* @data: Incoming data
*
- * If @type is %FW_CDEV_EVENT_PHY_PACKET_SENT, @length is 0 and @data empty.
+ * If @type is %FW_CDEV_EVENT_PHY_PACKET_SENT, @length is 0 and @data empty,
+ * except in case of a ping packet: Then, @length is 4, and @data[0] is the
+ * ping time in 49.152MHz clocks if @rcode is %RCODE_COMPLETE.
+ *
* If @type is %FW_CDEV_EVENT_PHY_PACKET_RECEIVED, @length is 8 and @data
* consists of the two PHY packet quadlets, in host byte order.
*/

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