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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 <[email protected]>
This commit is contained in:
Stefan Richter 2010-07-18 13:00:50 +02:00
commit cc550216ae
4 changed files with 18 additions and 4 deletions
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9
drivers/firewire/core-cdev.c
View file

@ -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);

5
drivers/firewire/core.h
View file

@ -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 */

3
drivers/firewire/ohci.c
View file

@ -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: