On Mon, 2010-06-07 at 11:40 +0300, Boaz Harrosh wrote: > On 06/07/2010 06:50 AM, Nicholas A. Bellinger wrote: > > From: Nicholas Bellinger <nab at linux-iscsi.org> > > > > This patch adds initial support for the block layer implementation of the sg v4 interface > > (BSG) -> STGT with a new struct backingstore_template bsg_bst sharing code with the > > original sg_bst. It adds for new function bs_bsg_cmd_submit() for incoming write I/O > > and bs_bsg_cmd_complete() for polling read I/O using include/linux/bsg.h:struct sg_io_v4. > > > > This patch also splits up bs_sg_open() to support both BSG and SG looking for the > > path "/dev/bsg" in bs_sg_open(), and getting max_queue using SG_GET_COMMAND_Q and > > calling SG_SET_RESERVED_SIZE (following the original bs_sg code in init_sg_device) > > > > Also chk_bsg_device() currently using a hardcoded 254 major as def for BSG does not > > appear in include/linux/major.h just yet.. > > > > So far this has been tested with STGT/iSCSI <-> BSG <-> TCM_Loop SPC-4 iSCSI Target > > Port emulation and is able to mkfs, fsck and mount a filesystem from a TCM/IBLOCK > > Linux LVM kernel level backstore > > > > Signed-off-by: Nicholas A. Bellinger <nab at linux-iscsi.org> > > --- > > usr/bs_sg.c | 178 +++++++++++++++++++++++++++++++++++++++++++++++++++--- > > usr/scsi_cmnd.h | 7 ++ > > 2 files changed, 175 insertions(+), 10 deletions(-) > > > > diff --git a/usr/bs_sg.c b/usr/bs_sg.c > > index 23676ef..d071714 100644 > > --- a/usr/bs_sg.c > > +++ b/usr/bs_sg.c <SNIP> > > + > > +static int bs_bsg_cmd_submit(struct scsi_cmd *cmd) > > +{ > > + struct scsi_lu *dev = cmd->dev; > > + int fd = dev->fd; > > + struct sg_io_v4 *io_hdr = &cmd->cmd_bsg_hdr; > > + int err = 0; > > + /* > > + * Following linux/include/linux/bsg.h > > + */ > > + /* [i] 'Q' to differentiate from v3 */ > > + io_hdr->guard = 'Q'; > > + io_hdr->protocol = BSG_PROTOCOL_SCSI; > > + io_hdr->subprotocol = BSG_SUB_PROTOCOL_SCSI_CMD; > > + io_hdr->request_len = cmd->scb_len; > > + io_hdr->request = (unsigned long )cmd->scb; > > + > > + if (scsi_get_data_dir(cmd) == DATA_WRITE) { > > Why the if? both sides are fully bidi just remove the ifs > and: OUT <= OUT, IN <= IN > Whoops, thanks for pointing this one out (again). Tested with unidirection commands and included into my local tgt.git/pass that I will send along to Tomo-san.. Btw, I still need to sort out BIDI support for TCM_Loop at some point in the not too distant future. What would be a good way to generate BIDI traffic into STGT or a local SCSI LLD..? Best, --nab -- To unsubscribe from this list: send the line "unsubscribe stgt" in the body of a message to majordomo at vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html |