firewire: sbp2: fix payload limit at S1600 and S3200

1394-2008 clause 16.3.4.1 (1394b-2002 clause 16.3.1.1) defines tighter
limits than 1394-2008 clause 6.2.2.3 (1394a-2000 clause 6.2.2.3).

Our previously too large limit doesn't matter though if the controller
reports its max_receive correctly.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c
index e88d506..ac80384 100644 (file)
--- a/drivers/firewire/fw-sbp2.c
+++ b/drivers/firewire/fw-sbp2.c
@@ -168,6 +168,7 @@ struct sbp2_target {
        int address_high;
        unsigned int workarounds;
        unsigned int mgt_orb_timeout;
+       unsigned int max_payload;
 
        int dont_block; /* counter for each logical unit */
        int blocked;    /* ditto */
@@ -1156,6 +1157,15 @@ static int sbp2_probe(struct device *dev)
 
        sbp2_init_workarounds(tgt, model, firmware_revision);
 
+       /*
+        * At S100 we can do 512 bytes per packet, at S200 1024 bytes,
+        * and so on up to 4096 bytes.  The SBP-2 max_payload field
+        * specifies the max payload size as 2 ^ (max_payload + 2), so
+        * if we set this to max_speed + 7, we get the right value.
+        */
+       tgt->max_payload = min(device->max_speed + 7, 10U);
+       tgt->max_payload = min(tgt->max_payload, device->card->max_receive - 1);
+
        /* Do the login in a workqueue so we can easily reschedule retries. */
        list_for_each_entry(lu, &tgt->lu_list, link)
                sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
@@ -1434,7 +1444,6 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
        struct sbp2_logical_unit *lu = cmd->device->hostdata;
        struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
        struct sbp2_command_orb *orb;
-       unsigned int max_payload;
        int generation, retval = SCSI_MLQUEUE_HOST_BUSY;
 
        /*
@@ -1462,17 +1471,9 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
        orb->done = done;
        orb->cmd  = cmd;
 
-       orb->request.next.high   = cpu_to_be32(SBP2_ORB_NULL);
-       /*
-        * At speed 100 we can do 512 bytes per packet, at speed 200,
-        * 1024 bytes per packet etc.  The SBP-2 max_payload field
-        * specifies the max payload size as 2 ^ (max_payload + 2), so
-        * if we set this to max_speed + 7, we get the right value.
-        */
-       max_payload = min(device->max_speed + 7,
-                         device->card->max_receive - 1);
+       orb->request.next.high = cpu_to_be32(SBP2_ORB_NULL);
        orb->request.misc = cpu_to_be32(
-               COMMAND_ORB_MAX_PAYLOAD(max_payload) |
+               COMMAND_ORB_MAX_PAYLOAD(lu->tgt->max_payload) |
                COMMAND_ORB_SPEED(device->max_speed) |
                COMMAND_ORB_NOTIFY);