[cam_periph_mapmen:?]

[Kenneth D. Merry]

On Thu, Aug 04, 2005 at 18:18:39 -0400, Heck, Steve wrote:
> I am having problems Writing to a SCSI tape drive.  
> 
> First the Block Size is being set to 65536 Bytes by Mode Select which succeeds.
> 
> printf ("Data compression enabled.\n");
>   
>   buf_data1c[0] = 0x00;
>   buf_data1c[1] = 0x00;
>   buf_data1c[2] = 0x10;
>   buf_data1c[3] = 0x08;
>   buf_data1c[4] = 0x7f;
>   buf_data1c[5] = 0x00;
>   buf_data1c[6] = 0x00;
>   buf_data1c[7] = 0x00;
>   buf_data1c[8] = 0x00;
>   buf_data1c[9] = 0x01;
>   buf_data1c[10] = 0x00;
>   buf_data1c[11] = 0x00;
>   buf_data1c[12] = 0x0f;
>   buf_data1c[13] = 0x0e;
>   buf_data1c[14] = 0xc0;
>   buf_data1c[15] = 0x80;
>   buf_data1c[16] = 0x00;
>   buf_data1c[17] = 0x00;
>   buf_data1c[18] = 0x00;
>   buf_data1c[19] = 0x00;
>   buf_data1c[20] = 0x00;
>   buf_data1c[21] = 0x00;
>   buf_data1c[22] = 0x00;
>   buf_data1c[23] = 0x00;
>   buf_data1c[24] = 0x00;
>   buf_data1c[25] = 0x00;
>   buf_data1c[26] = 0x00;
>   buf_data1c[27] = 0x00;
> 
>   //unsigned char header[len];
>   memset( header, 0, len );
>   memset(&ccb,0,sizeof(ccb));
>   ccb.ccb_h.path_id    = cam->path_id;
>   ccb.ccb_h.target_id  = cam->target_id;
>   ccb.ccb_h.target_lun = cam->target_lun;
>   cam_fill_csio (&(ccb.csio), 1, NULL, CAM_DIR_OUT, MSG_SIMPLE_Q_TAG, buf_data1c, sizeof(buf_data1c), sizeof(ccb.csio.sense_data), 0, 30*1000);
>   ccb.csio.cdb_len = 6;
>   ccb.csio.cdb_io.cdb_bytes[0] = 0x15;	// Mode Select
>   ccb.csio.cdb_io.cdb_bytes[1] = 0x10;
>   ccb.csio.cdb_io.cdb_bytes[4] = 0x1c;
>   ccb.csio.cdb_io.cdb_bytes[5] = 0x00;  
>  
>   //int ret;
>   if ((ret = cam_send_ccb(cam, &ccb)) < 0)
>   {
>       printf("cam_send_ccb: failed\n");
>       cam_close_device(cam);
>       return -1;
>   }
> 
> 
> The problem occurs when I try to Write one Fixed Block.
> 
> 
>   unsigned char wbuf_data[65536]
> 
>   memset( header, 0, len );
>   memset(&ccb,0,sizeof(ccb));
>   ccb.ccb_h.path_id    = cam->path_id;
>   ccb.ccb_h.target_id  = cam->target_id;
>   ccb.ccb_h.target_lun = cam->target_lun;
>   cam_fill_csio (&(ccb.csio), 1, NULL, CAM_DIR_OUT, MSG_SIMPLE_Q_TAG, wbuf_data, sizeof(wbuf_data), sizeof(ccb.csio.sense_data), 0, 900*1000);
>   ccb.csio.cdb_len = 6;
>   ccb.csio.cdb_io.cdb_bytes[0] = 0x0a;	// Write
>   ccb.csio.cdb_io.cdb_bytes[1] = 0x01;
>   ccb.csio.cdb_io.cdb_bytes[4] = 0x01;
>   ccb.csio.cdb_io.cdb_bytes[5] = 0x00;  
> 
> if ((ret = cam_send_ccb(cam, &ccb)) < 0)
>   {
>       printf("cam_send_ccb: failed\n");
>       cam_close_device(cam);
>       return -1;
>   }
> 
> I get this error:
> 
> cam_periph_mapmem: attempt to map 68480 bytes, which is greater that DFLTPHYS(65536)
> 
> cam_send_ccb: failed
> 
> I do not see the Write cdb being sent when I make a SCSI trace. 
> 
> Any help would be appreciated.

Here's the comment/code in question:

		/*
		 * The userland data pointer passed in may not be page
		 * aligned.  vmapbuf() truncates the address to a page
		 * boundary, so if the address isn't page aligned, we'll
		 * need enough space for the given transfer length, plus
		 * whatever extra space is necessary to make it to the page
		 * boundary.
		 */
		if ((lengths[i] +
		    (((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)) > DFLTPHYS){
			printf("cam_periph_mapmem: attempt to map %lu bytes, "
			       "which is greater than DFLTPHYS(%d)\n",
			       (long)(lengths[i] +
			       (((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)),
			       DFLTPHYS);
			return(E2BIG);
		}

If you make sure your data buffer is page aligned, you should be able to
send a 64K request down through the passthrough driver.

Ken
-- 
Kenneth Merry
ken at FreeBSD.org