[SCSI] 2.6 aacraid: Variable FIB size (updated patch)

New code from the Adaptec driver.  Performance enhancement for newer
adapters.  I hope that this isn't too big for a single patch.  I believe
that other than the few small cleanups mentioned, that the changes are
all related.

- Added Variable FIB size negotiation for new adapters.
- Added support to maximize scatter gather tables and thus permit
  requests larger than 64KB/each.
- Limit Scatter Gather to 34 elements for ROMB platforms.
- aac_printf is only enabled with AAC_QUIRK_34SG
- Large FIB ioctl support
- some minor cleanup

Passes sparse check.
I have tested it on x86 and ppc64 machines.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 29 insertions, 4 deletions

diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c
index 5fd8f3ee9804..6f05d86c7bb3 100644
--- a/drivers/scsi/aacraid/linit.c
+++ b/drivers/scsi/aacraid/linit.c
@@ -347,10 +347,16 @@ static int aac_biosparm(struct scsi_device *sdev, struct block_device *bdev,
 
 static int aac_slave_configure(struct scsi_device *sdev)
 {
+        struct Scsi_Host *host = sdev->host;
+
         if (sdev->tagged_supported)
                 scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, 128);
         else
                 scsi_adjust_queue_depth(sdev, 0, 1);
+
+        if (host->max_sectors < AAC_MAX_32BIT_SGBCOUNT)
+                blk_queue_max_segment_size(sdev->request_queue, 65536);
+
         return 0;
 }
 
@@ -439,11 +445,11 @@ static int aac_eh_reset(struct scsi_cmnd* cmd)
 static int aac_cfg_open(struct inode *inode, struct file *file)
 {
         struct aac_dev *aac;
-        unsigned minor = iminor(inode);
+        unsigned minor_number = iminor(inode);
         int err = -ENODEV;
 
         list_for_each_entry(aac, &aac_devices, entry) {
-                if (aac->id == minor) {
+                if (aac->id == minor_number) {
                         file->private_data = aac;
                         err = 0;
                         break;
@@ -489,6 +495,7 @@ static long aac_compat_do_ioctl(struct aac_dev *dev, unsigned cmd, unsigned long
         case FSACTL_DELETE_DISK:
         case FSACTL_FORCE_DELETE_DISK:
         case FSACTL_GET_CONTAINERS: 
+        case FSACTL_SEND_LARGE_FIB:
                 ret = aac_do_ioctl(dev, cmd, (void __user *)arg);
                 break;
 
@@ -538,7 +545,7 @@ static struct file_operations aac_cfg_fops = {
 static struct scsi_host_template aac_driver_template = {
         .module                         = THIS_MODULE,
         .name                           = "AAC",
-        .proc_name                      = "aacraid",
+        .proc_name                      = AAC_DRIVERNAME,
         .info                           = aac_info,
         .ioctl                          = aac_ioctl,
 #ifdef CONFIG_COMPAT
@@ -612,7 +619,7 @@ static int __devinit aac_probe_one(struct pci_dev *pdev,
         aac->cardtype =  index;
         INIT_LIST_HEAD(&aac->entry);
 
-        aac->fibs = kmalloc(sizeof(struct fib) * AAC_NUM_FIB, GFP_KERNEL);
+        aac->fibs = kmalloc(sizeof(struct fib) * (shost->can_queue + AAC_NUM_MGT_FIB), GFP_KERNEL);
         if (!aac->fibs)
                 goto out_free_host;
         spin_lock_init(&aac->fib_lock);
@@ -632,6 +639,24 @@ static int __devinit aac_probe_one(struct pci_dev *pdev,
         aac_get_adapter_info(aac);
 
         /*
+         * Lets override negotiations and drop the maximum SG limit to 34
+         */
+        if ((aac_drivers[index].quirks & AAC_QUIRK_34SG) && 
+                        (aac->scsi_host_ptr->sg_tablesize > 34)) {
+                aac->scsi_host_ptr->sg_tablesize = 34;
+                aac->scsi_host_ptr->max_sectors
+                  = (aac->scsi_host_ptr->sg_tablesize * 8) + 112;
+        }
+
+        /*
+         * Firware printf works only with older firmware.
+         */
+        if (aac_drivers[index].quirks & AAC_QUIRK_34SG) 
+                aac->printf_enabled = 1;
+        else
+                aac->printf_enabled = 0;
+ 
+        /*
          * max channel will be the physical channels plus 1 virtual channel
          * all containers are on the virtual channel 0
          * physical channels are address by their actual physical number+1