On Thu, 2011-12-08 at 18:30 +0100, Sebastian Andrzej Siewior wrote:
> As of now it supports HS only (SS is not yet supported).
> Only commands are passed (read/write requests are handled but TASK
> MANAGEMENT functions and others from this category are not).
>
> Temporary, it requires the transfer direction to be hardcoded.
> I need to figure out how to bypass informations to the gadget framework.
> Until then, enjoy the_only_tpg_I_currently_have.
>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
> ---
> drivers/target/Kconfig | 1 +
> drivers/target/Makefile | 1 +
> drivers/target/uasp/Kconfig | 6 +
> drivers/target/uasp/Makefile | 5 +
> drivers/target/uasp/base.h | 39 ++
> drivers/target/uasp/configfs.c | 518 +++++++++++++++++++++++++
> drivers/target/uasp/configfs.h | 7 +
> drivers/target/uasp/fabric.c | 407 ++++++++++++++++++++
> drivers/target/uasp/fabric.h | 39 ++
> drivers/target/uasp/gadget.c | 770 ++++++++++++++++++++++++++++++++++++++
> drivers/target/uasp/gadget.h | 81 ++++
> drivers/target/uasp/gadget_ops.h | 13 +
> drivers/usb/gadget/Kconfig | 3 +
> 13 files changed, 1890 insertions(+), 0 deletions(-)
> create mode 100644 drivers/target/uasp/Kconfig
> create mode 100644 drivers/target/uasp/Makefile
> create mode 100644 drivers/target/uasp/base.h
> create mode 100644 drivers/target/uasp/configfs.c
> create mode 100644 drivers/target/uasp/configfs.h
> create mode 100644 drivers/target/uasp/fabric.c
> create mode 100644 drivers/target/uasp/fabric.h
> create mode 100644 drivers/target/uasp/gadget.c
> create mode 100644 drivers/target/uasp/gadget.h
> create mode 100644 drivers/target/uasp/gadget_ops.h
>
> diff --git a/drivers/target/uasp/fabric.c b/drivers/target/uasp/fabric.c
> new file mode 100644
> index 0000000..7f16709
> --- /dev/null
> +++ b/drivers/target/uasp/fabric.c
> @@ -0,0 +1,407 @@
> +#include <linux/slab.h>
> +#include <linux/kthread.h>
> +#include <linux/types.h>
> +#include <linux/list.h>
> +#include <linux/types.h>
> +#include <linux/string.h>
> +#include <linux/ctype.h>
> +#include <asm/unaligned.h>
> +#include <scsi/scsi.h>
> +#include <scsi/scsi_host.h>
> +#include <scsi/scsi_device.h>
> +#include <scsi/scsi_cmnd.h>
> +#include <scsi/libfc.h>
> +#include <scsi/scsi_tcq.h>
> +
> +#include <target/target_core_base.h>
> +#include <target/target_core_fabric.h>
> +#include <target/target_core_configfs.h>
> +
> +#include "base.h"
> +#include "fabric.h"
> +#include "gadget_ops.h"
> +#include "gadget.h"
> +
> +#define UAS_SIMPLE_TAG 0
> +#define UAS_HEAD_TAG 1
> +#define UAS_ORDERED_TAG 2
> +#define UAS_ACA 4
> +
> +extern struct uasp_tpg *the_only_tpg_I_currently_have;
> +
> +void uasp_submit_command(struct f_uas *fu, void *cmdbuf, unsigned int len)
> +{
> + struct command_iu *cmd_iu = cmdbuf;
> + struct uasp_cmd *cmd;
> + struct uasp_tpg *tpg;
> + struct se_session *se_sess;
> + struct se_cmd *se_cmd;
> + struct tcm_uasp_nexus *tv_nexus;
> + u32 cmd_len;
> + u32 prio;
> + u32 unpacked_lun;
> + int ret;
> +
> + if (cmd_iu->iu_id != IU_ID_COMMAND) {
> + pr_err("Unsupported type %d\n", cmd_iu->iu_id);
> + return;
> + }
> +
> + cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
> + if (!cmd)
> + return;
> +
> + cmd->fu = fu;
> +
> + /* XXX until I figure out why I can't free in on complete */
> + kref_init(&cmd->ref);
> + kref_get(&cmd->ref);
> +
> + tpg = the_only_tpg_I_currently_have;
> +
Mmmmm, not so good a setup for multiple endpoints.. ;)
Generally a fabric should make se_portal_group usage embedded into a
fabric dependent struct like uasp_tpg->se_tpg that is registered within
target_core_fabric_configfs.c generic callers. A few fabrics use
target_core_fabric_ops->fabric_make_tpg() caller to walk an list of
entries that may be pre-registered for usage for the specific fabric
driver, and enabled during ->fabric_make_tpg() or ->fabric_make_wwn()
(eg: gadgets to register with tcm_uasp and enable gadget_connect)
So using a usb gadget list that is available to tcm_uasp at configfs
uasp_make_tpg() + uasp_drop_tpg() time is one option. The other option
is to add a fabric endpoint specific pointer for each usb gadget that is
setup during uasp_make_tpg() (or gadget_connect) which is available for
uasp_submit_cmd() I/O path code usage.
--nab
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