--- /dev/null
+/* Target based USB-Gadget
+ *
+ * UAS protocol handling, target callbacks, configfs handling,
+ * BBB (USB Mass Storage Class Bulk-Only (BBB) and Transport protocol handling.
+ *
+ * Author: Sebastian Andrzej Siewior <bigeasy at linutronix dot de>
+ * License: GPLv2 as published by FSF.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/configfs.h>
+#include <linux/ctype.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/composite.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/storage.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_tcq.h>
+#include <target/target_core_base.h>
+#include <target/target_core_fabric.h>
+#include <target/target_core_fabric_configfs.h>
+#include <target/target_core_configfs.h>
+#include <target/configfs_macros.h>
+#include <asm/unaligned.h>
+
+#include "usbstring.c"
+#include "epautoconf.c"
+#include "config.c"
+#include "composite.c"
+
+#include "tcm_usb_gadget.h"
+
+static struct target_fabric_configfs *usbg_fabric_configfs;
+
+static inline struct f_uas *to_f_uas(struct usb_function *f)
+{
+ return container_of(f, struct f_uas, function);
+}
+
+static void usbg_cmd_release(struct kref *);
+
+static inline void usbg_cleanup_cmd(struct usbg_cmd *cmd)
+{
+ kref_put(&cmd->ref, usbg_cmd_release);
+}
+
+/* Start bot.c code */
+
+static int bot_enqueue_cmd_cbw(struct f_uas *fu)
+{
+ int ret;
+
+ if (fu->flags & USBG_BOT_CMD_PEND)
+ return 0;
+
+ ret = usb_ep_queue(fu->ep_out, fu->cmd.req, GFP_ATOMIC);
+ if (!ret)
+ fu->flags |= USBG_BOT_CMD_PEND;
+ return ret;
+}
+
+static void bot_status_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct usbg_cmd *cmd = req->context;
+ struct f_uas *fu = cmd->fu;
+
+ usbg_cleanup_cmd(cmd);
+ if (req->status < 0) {
+ pr_err("ERR %s(%d)\n", __func__, __LINE__);
+ return;
+ }
+
+ /* CSW completed, wait for next CBW */
+ bot_enqueue_cmd_cbw(fu);
+}
+
+static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd)
+{
+ struct bulk_cs_wrap *csw = &fu->bot_status.csw;
+ int ret;
+ u8 *sense;
+ unsigned int csw_stat;
+
+ csw_stat = cmd->csw_code;
+
+ /*
+ * We can't send SENSE as a response. So we take ASC & ASCQ from our
+ * sense buffer and queue it and hope the host sends a REQUEST_SENSE
+ * command where it learns why we failed.
+ */
+ sense = cmd->sense_iu.sense;
+
+ csw->Tag = cmd->bot_tag;
+ csw->Status = csw_stat;
+ fu->bot_status.req->context = cmd;
+ ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC);
+ if (ret)
+ pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
+}
+
+static void bot_err_compl(struct usb_ep *ep, struct usb_request *req)
+{
+ struct usbg_cmd *cmd = req->context;
+ struct f_uas *fu = cmd->fu;
+
+ if (req->status < 0)
+ pr_err("ERR %s(%d)\n", __func__, __LINE__);
+
+ if (cmd->data_len) {
+ if (cmd->data_len > ep->maxpacket) {
+ req->length = ep->maxpacket;
+ cmd->data_len -= ep->maxpacket;
+ } else {
+ req->length = cmd->data_len;
+ cmd->data_len = 0;
+ }
+
+ usb_ep_queue(ep, req, GFP_ATOMIC);
+ return ;
+ }
+ bot_enqueue_sense_code(fu, cmd);
+}
+
+static void bot_send_bad_status(struct usbg_cmd *cmd)
+{
+ struct f_uas *fu = cmd->fu;
+ struct bulk_cs_wrap *csw = &fu->bot_status.csw;
+ struct usb_request *req;
+ struct usb_ep *ep;
+
+ csw->Residue = cpu_to_le32(cmd->data_len);
+
+ if (cmd->data_len) {
+ if (cmd->is_read) {
+ ep = fu->ep_in;
+ req = fu->bot_req_in;
+ } else {
+ ep = fu->ep_out;
+ req = fu->bot_req_out;
+ }
+
+ if (cmd->data_len > fu->ep_in->maxpacket) {
+ req->length = ep->maxpacket;
+ cmd->data_len -= ep->maxpacket;
+ } else {
+ req->length = cmd->data_len;
+ cmd->data_len = 0;
+ }
+ req->complete = bot_err_compl;
+ req->context = cmd;
+ req->buf = fu->cmd.buf;
+ usb_ep_queue(ep, req, GFP_KERNEL);
+ } else {
+ bot_enqueue_sense_code(fu, cmd);
+ }
+}
+
+static int bot_send_status(struct usbg_cmd *cmd, bool moved_data)
+{
+ struct f_uas *fu = cmd->fu;
+ struct bulk_cs_wrap *csw = &fu->bot_status.csw;
+ int ret;
+
+ if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) {
+ if (!moved_data && cmd->data_len) {
+ /*
+ * the host wants to move data, we don't. Fill / empty
+ * the pipe and then send the csw with reside set.
+ */
+ cmd->csw_code = US_BULK_STAT_OK;
+ bot_send_bad_status(cmd);
+ return 0;
+ }
+
+ csw->Tag = cmd->bot_tag;
+ csw->Residue = cpu_to_le32(0);
+ csw->Status = US_BULK_STAT_OK;
+ fu->bot_status.req->context = cmd;
+
+ ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL);
+ if (ret)
+ pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
+ } else {
+ cmd->csw_code = US_BULK_STAT_FAIL;
+ bot_send_bad_status(cmd);
+ }
+ return 0;
+}
+
+/*
+ * Called after command (no data transfer) or after the write (to device)
+ * operation is completed
+ */
+static int bot_send_status_response(struct usbg_cmd *cmd)
+{
+ bool moved_data = false;
+
+ if (!cmd->is_read)
+ moved_data = true;
+ return bot_send_status(cmd, moved_data);
+}
+
+/* Read request completed, now we have to send the CSW */
+static void bot_read_compl(struct usb_ep *ep, struct usb_request *req)
+{
+ struct usbg_cmd *cmd = req->context;
+
+ if (req->status < 0)
+ pr_err("ERR %s(%d)\n", __func__, __LINE__);
+
+ bot_send_status(cmd, true);
+}
+
+static int bot_send_read_response(struct usbg_cmd *cmd)
+{
+ struct f_uas *fu = cmd->fu;
+ struct se_cmd *se_cmd = &cmd->se_cmd;
+ struct usb_gadget *gadget = fuas_to_gadget(fu);
+ int ret;
+
+ if (!cmd->data_len) {
+ cmd->csw_code = US_BULK_STAT_PHASE;
+ bot_send_bad_status(cmd);
+ return 0;
+ }
+
+ if (!gadget->sg_supported) {
+ cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
+ if (!cmd->data_buf)
+ return -ENOMEM;
+
+ sg_copy_to_buffer(se_cmd->t_data_sg,
+ se_cmd->t_data_nents,
+ cmd->data_buf,
+ se_cmd->data_length);
+
+ fu->bot_req_in->buf = cmd->data_buf;
+ } else {
+ fu->bot_req_in->buf = NULL;
+ fu->bot_req_in->num_sgs = se_cmd->t_data_nents;
+ fu->bot_req_in->sg = se_cmd->t_data_sg;
+ }
+
+ fu->bot_req_in->complete = bot_read_compl;
+ fu->bot_req_in->length = se_cmd->data_length;
+ fu->bot_req_in->context = cmd;
+ ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC);
+ if (ret)
+ pr_err("%s(%d)\n", __func__, __LINE__);
+ return 0;
+}
+
+static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *);
+static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *);
+
+static int bot_send_write_request(struct usbg_cmd *cmd)
+{
+ struct f_uas *fu = cmd->fu;
+ struct se_cmd *se_cmd = &cmd->se_cmd;
+ struct usb_gadget *gadget = fuas_to_gadget(fu);
+ int ret;
+
+ init_completion(&cmd->write_complete);
+ cmd->fu = fu;
+
+ if (!cmd->data_len) {
+ cmd->csw_code = US_BULK_STAT_PHASE;
+ return -EINVAL;
+ }
+
+ if (!gadget->sg_supported) {
+ cmd->data_buf = kmalloc(se_cmd->data_length, GFP_KERNEL);
+ if (!cmd->data_buf)
+ return -ENOMEM;
+
+ fu->bot_req_out->buf = cmd->data_buf;
+ } else {
+ fu->bot_req_out->buf = NULL;
+ fu->bot_req_out->num_sgs = se_cmd->t_data_nents;
+ fu->bot_req_out->sg = se_cmd->t_data_sg;
+ }
+
+ fu->bot_req_out->complete = usbg_data_write_cmpl;
+ fu->bot_req_out->length = se_cmd->data_length;
+ fu->bot_req_out->context = cmd;
+
+ ret = usbg_prepare_w_request(cmd, fu->bot_req_out);
+ if (ret)
+ goto cleanup;
+ ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL);
+ if (ret)
+ pr_err("%s(%d)\n", __func__, __LINE__);
+
+ wait_for_completion(&cmd->write_complete);
+ transport_generic_process_write(se_cmd);
+cleanup:
+ return ret;
+}
+
+static int bot_submit_command(struct f_uas *, void *, unsigned int);
+
+static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct f_uas *fu = req->context;
+ int ret;
+
+ fu->flags &= ~USBG_BOT_CMD_PEND;
+
+ if (req->status < 0)
+ return;
+
+ ret = bot_submit_command(fu, req->buf, req->actual);
+ if (ret)
+ pr_err("%s(%d): %d\n", __func__, __LINE__, ret);
+}
+
+static int bot_prepare_reqs(struct f_uas *fu)
+{
+ int ret;
+
+ fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
+ if (!fu->bot_req_in)
+ goto err;
+
+ fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
+ if (!fu->bot_req_out)
+ goto err_out;
+
+ fu->cmd.req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
+ if (!fu->cmd.req)
+ goto err_cmd;
+
+ fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
+ if (!fu->bot_status.req)
+ goto err_sts;
+
+ fu->bot_status.req->buf = &fu->bot_status.csw;
+ fu->bot_status.req->length = US_BULK_CS_WRAP_LEN;
+ fu->bot_status.req->complete = bot_status_complete;
+ fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN);
+
+ fu->cmd.buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL);
+ if (!fu->cmd.buf)
+ goto err_buf;
+
+ fu->cmd.req->complete = bot_cmd_complete;
+ fu->cmd.req->buf = fu->cmd.buf;
+ fu->cmd.req->length = fu->ep_out->maxpacket;
+ fu->cmd.req->context = fu;
+
+ ret = bot_enqueue_cmd_cbw(fu);
+ if (ret)
+ goto err_queue;
+ return 0;
+err_queue:
+ kfree(fu->cmd.buf);
+ fu->cmd.buf = NULL;
+err_buf:
+ usb_ep_free_request(fu->ep_in, fu->bot_status.req);
+err_sts:
+ usb_ep_free_request(fu->ep_out, fu->cmd.req);
+ fu->cmd.req = NULL;
+err_cmd:
+ usb_ep_free_request(fu->ep_out, fu->bot_req_out);
+ fu->bot_req_out = NULL;
+err_out:
+ usb_ep_free_request(fu->ep_in, fu->bot_req_in);
+ fu->bot_req_in = NULL;
+err:
+ pr_err("BOT: endpoint setup failed\n");
+ return -ENOMEM;
+}
+
+void bot_cleanup_old_alt(struct f_uas *fu)
+{
+ if (!(fu->flags & USBG_ENABLED))
+ return;
+
+ usb_ep_disable(fu->ep_in);
+ usb_ep_disable(fu->ep_out);
+
+ if (!fu->bot_req_in)
+ return;
+
+ usb_ep_free_request(fu->ep_in, fu->bot_req_in);
+ usb_ep_free_request(fu->ep_out, fu->bot_req_out);
+ usb_ep_free_request(fu->ep_out, fu->cmd.req);
+ usb_ep_free_request(fu->ep_out, fu->bot_status.req);
+
+ kfree(fu->cmd.buf);
+
+ fu->bot_req_in = NULL;
+ fu->bot_req_out = NULL;
+ fu->cmd.req = NULL;
+ fu->bot_status.req = NULL;
+ fu->cmd.buf = NULL;
+}
+
+static void bot_set_alt(struct f_uas *fu)
+{
+ struct usb_function *f = &fu->function;
+ struct usb_gadget *gadget = f->config->cdev->gadget;
+ int ret;
+
+ fu->flags = USBG_IS_BOT;
+
+ config_ep_by_speed(gadget, f, fu->ep_in);
+ ret = usb_ep_enable(fu->ep_in);
+ if (ret)
+ goto err_b_in;
+
+ config_ep_by_speed(gadget, f, fu->ep_out);
+ ret = usb_ep_enable(fu->ep_out);
+ if (ret)
+ goto err_b_out;
+
+ ret = bot_prepare_reqs(fu);
+ if (ret)
+ goto err_wq;
+ fu->flags |= USBG_ENABLED;
+ pr_info("Using the BOT protocol\n");
+ return;
+err_wq:
+ usb_ep_disable(fu->ep_out);
+err_b_out:
+ usb_ep_disable(fu->ep_in);
+err_b_in:
+ fu->flags = USBG_IS_BOT;
+}
+
+static int usbg_bot_setup(struct usb_function *f,
+ const struct usb_ctrlrequest *ctrl)
+{
+ struct f_uas *fu = to_f_uas(f);
+ struct usb_composite_dev *cdev = f->config->cdev;
+ u16 w_value = le16_to_cpu(ctrl->wValue);
+ u16 w_length = le16_to_cpu(ctrl->wLength);
+ int luns;
+ u8 *ret_lun;
+
+ switch (ctrl->bRequest) {
+ case US_BULK_GET_MAX_LUN:
+ if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS |
+ USB_RECIP_INTERFACE))
+ return -ENOTSUPP;
+
+ if (w_length < 1)
+ return -EINVAL;
+ if (w_value != 0)
+ return -EINVAL;
+ luns = atomic_read(&fu->tpg->tpg_port_count);
+ if (!luns) {
+ pr_err("No LUNs configured?\n");
+ return -EINVAL;
+ }
+ /*
+ * If 4 LUNs are present we return 3 i.e. LUN 0..3 can be
+ * accessed. The upper limit is 0xf
+ */
+ luns--;
+ if (luns > 0xf) {
+ pr_info_once("Limiting the number of luns to 16\n");
+ luns = 0xf;
+ }
+ ret_lun = cdev->req->buf;
+ *ret_lun = luns;
+ cdev->req->length = 1;
+ return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
+ break;
+
+ case US_BULK_RESET_REQUEST:
+ /* XXX maybe we should remove previous requests for IN + OUT */
+ bot_enqueue_cmd_cbw(fu);
+ return 0;
+ break;
+ };
+ return -ENOTSUPP;
+}
+
+/* Start uas.c code */
+
+static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream)
+{
+ /* We have either all three allocated or none */
+ if (!stream->req_in)
+ return;
+
+ usb_ep_free_request(fu->ep_in, stream->req_in);
+ usb_ep_free_request(fu->ep_out, stream->req_out);
+ usb_ep_free_request(fu->ep_status, stream->req_status);
+
+ stream->req_in = NULL;
+ stream->req_out = NULL;
+ stream->req_status = NULL;
+}
+
+static void uasp_free_cmdreq(struct f_uas *fu)
+{
+ usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
+ kfree(fu->cmd.buf);
+ fu->cmd.req = NULL;
+ fu->cmd.buf = NULL;
+}
+
+static void uasp_cleanup_old_alt(struct f_uas *fu)
+{
+ int i;
+
+ if (!(fu->flags & USBG_ENABLED))
+ return;
+
+ usb_ep_disable(fu->ep_in);
+ usb_ep_disable(fu->ep_out);
+ usb_ep_disable(fu->ep_status);
+ usb_ep_disable(fu->ep_cmd);
+
+ for (i = 0; i < UASP_SS_EP_COMP_NUM_STREAMS; i++)
+ uasp_cleanup_one_stream(fu, &fu->stream[i]);
+ uasp_free_cmdreq(fu);
+}
+
+static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req);
+
+static int uasp_prepare_r_request(struct usbg_cmd *cmd)
+{
+ struct se_cmd *se_cmd = &cmd->se_cmd;
+ struct f_uas *fu = cmd->fu;
+ struct usb_gadget *gadget = fuas_to_gadget(fu);
+ struct uas_stream *stream = cmd->stream;
+
+ if (!gadget->sg_supported) {
+ cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
+ if (!cmd->data_buf)
+ return -ENOMEM;
+
+ sg_copy_to_buffer(se_cmd->t_data_sg,
+ se_cmd->t_data_nents,
+ cmd->data_buf,
+ se_cmd->data_length);
+
+ stream->req_in->buf = cmd->data_buf;
+ } else {
+ stream->req_in->buf = NULL;
+ stream->req_in->num_sgs = se_cmd->t_data_nents;
+ stream->req_in->sg = se_cmd->t_data_sg;
+ }
+
+ stream->req_in->complete = uasp_status_data_cmpl;
+ stream->req_in->length = se_cmd->data_length;
+ stream->req_in->context = cmd;
+
+ cmd->state = UASP_SEND_STATUS;
+ return 0;
+}
+
+static void uasp_prepare_status(struct usbg_cmd *cmd)
+{
+ struct se_cmd *se_cmd = &cmd->se_cmd;
+ struct sense_iu *iu = &cmd->sense_iu;
+ struct uas_stream *stream = cmd->stream;
+
+ cmd->state = UASP_QUEUE_COMMAND;
+ iu->iu_id = IU_ID_STATUS;
+ iu->tag = cpu_to_be16(cmd->tag);
+
+ /*
+ * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?);
+ */
+ iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
+ iu->status = se_cmd->scsi_status;
+ stream->req_status->context = cmd;
+ stream->req_status->length = se_cmd->scsi_sense_length + 16;
+ stream->req_status->buf = iu;
+ stream->req_status->complete = uasp_status_data_cmpl;
+}
+
+static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req)
+{
+ struct usbg_cmd *cmd = req->context;
+ struct uas_stream *stream = cmd->stream;
+ struct f_uas *fu = cmd->fu;
+ int ret;
+
+ if (req->status < 0)
+ goto cleanup;
+
+ switch (cmd->state) {
+ case UASP_SEND_DATA:
+ ret = uasp_prepare_r_request(cmd);
+ if (ret)
+ goto cleanup;
+ ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
+ if (ret)
+ pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
+ break;
+
+ case UASP_RECEIVE_DATA:
+ ret = usbg_prepare_w_request(cmd, stream->req_out);
+ if (ret)
+ goto cleanup;
+ ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
+ if (ret)
+ pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
+ break;
+
+ case UASP_SEND_STATUS:
+ uasp_prepare_status(cmd);
+ ret = usb_ep_queue(fu->ep_status, stream->req_status,
+ GFP_ATOMIC);
+ if (ret)
+ pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
+ break;
+
+ case UASP_QUEUE_COMMAND:
+ usbg_cleanup_cmd(cmd);
+ usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
+ break;
+
+ default:
+ BUG();
+ };
+ return;
+
+cleanup:
+ usbg_cleanup_cmd(cmd);
+}
+
+static int uasp_send_status_response(struct usbg_cmd *cmd)
+{
+ struct f_uas *fu = cmd->fu;
+ struct uas_stream *stream = cmd->stream;
+ struct sense_iu *iu = &cmd->sense_iu;
+
+ iu->tag = cpu_to_be16(cmd->tag);
+ stream->req_status->complete = uasp_status_data_cmpl;
+ stream->req_status->context = cmd;
+ cmd->fu = fu;
+ uasp_prepare_status(cmd);
+ return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC);
+}
+
+static int uasp_send_read_response(struct usbg_cmd *cmd)
+{
+ struct f_uas *fu = cmd->fu;
+ struct uas_stream *stream = cmd->stream;
+ struct sense_iu *iu = &cmd->sense_iu;
+ int ret;
+
+ cmd->fu = fu;
+
+ iu->tag = cpu_to_be16(cmd->tag);
+ if (fu->flags & USBG_USE_STREAMS) {
+
+ ret = uasp_prepare_r_request(cmd);
+ if (ret)
+ goto out;
+ ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
+ if (ret) {
+ pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
+ kfree(cmd->data_buf);
+ cmd->data_buf = NULL;
+ }
+
+ } else {
+
+ iu->iu_id = IU_ID_READ_READY;
+ iu->tag = cpu_to_be16(cmd->tag);
+
+ stream->req_status->complete = uasp_status_data_cmpl;
+ stream->req_status->context = cmd;
+
+ cmd->state = UASP_SEND_DATA;
+ stream->req_status->buf = iu;
+ stream->req_status->length = sizeof(struct iu);
+
+ ret = usb_ep_queue(fu->ep_status, stream->req_status,
+ GFP_ATOMIC);
+ if (ret)
+ pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
+ }
+out:
+ return ret;
+}
+
+static int uasp_send_write_request(struct usbg_cmd *cmd)
+{
+ struct f_uas *fu = cmd->fu;
+ struct se_cmd *se_cmd = &cmd->se_cmd;
+ struct uas_stream *stream = cmd->stream;
+ struct sense_iu *iu = &cmd->sense_iu;
+ int ret;
+
+ init_completion(&cmd->write_complete);
+ cmd->fu = fu;
+
+ iu->tag = cpu_to_be16(cmd->tag);
+
+ if (fu->flags & USBG_USE_STREAMS) {
+
+ ret = usbg_prepare_w_request(cmd, stream->req_out);
+ if (ret)
+ goto cleanup;
+ ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
+ if (ret)
+ pr_err("%s(%d)\n", __func__, __LINE__);
+
+ } else {
+
+ iu->iu_id = IU_ID_WRITE_READY;
+ iu->tag = cpu_to_be16(cmd->tag);
+
+ stream->req_status->complete = uasp_status_data_cmpl;
+ stream->req_status->context = cmd;
+
+ cmd->state = UASP_RECEIVE_DATA;
+ stream->req_status->buf = iu;
+ stream->req_status->length = sizeof(struct iu);
+
+ ret = usb_ep_queue(fu->ep_status, stream->req_status,
+ GFP_ATOMIC);
+ if (ret)
+ pr_err("%s(%d)\n", __func__, __LINE__);
+ }
+
+ wait_for_completion(&cmd->write_complete);
+ transport_generic_process_write(se_cmd);
+cleanup:
+ return ret;
+}
+
+static int usbg_submit_command(struct f_uas *, void *, unsigned int);
+
+static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct f_uas *fu = req->context;
+ int ret;
+
+ if (req->status < 0)
+ return;
+
+ ret = usbg_submit_command(fu, req->buf, req->actual);
+ /*
+ * Once we tune for performance enqueue the command req here again so
+ * we can receive a second command while we processing this one. Pay
+ * attention to properly sync STAUS endpoint with DATA IN + OUT so you
+ * don't break HS.
+ */
+ if (!ret)
+ return;
+ usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
+}
+
+static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream)
+{
+ stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
+ if (!stream->req_in)
+ goto out;
+
+ stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
+ if (!stream->req_out)
+ goto err_out;
+
+ stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL);
+ if (!stream->req_status)
+ goto err_sts;
+
+ return 0;
+err_sts:
+ usb_ep_free_request(fu->ep_status, stream->req_status);
+ stream->req_status = NULL;
+err_out:
+ usb_ep_free_request(fu->ep_out, stream->req_out);
+ stream->req_out = NULL;
+out:
+ return -ENOMEM;
+}
+
+static int uasp_alloc_cmd(struct f_uas *fu)
+{
+ fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL);
+ if (!fu->cmd.req)
+ goto err;
+
+ fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL);
+ if (!fu->cmd.buf)
+ goto err_buf;
+
+ fu->cmd.req->complete = uasp_cmd_complete;
+ fu->cmd.req->buf = fu->cmd.buf;
+ fu->cmd.req->length = fu->ep_cmd->maxpacket;
+ fu->cmd.req->context = fu;
+ return 0;
+
+err_buf:
+ usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
+err:
+ return -ENOMEM;
+}
+
+static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
+{
+ int i;
+
+ for (i = 0; i < max_streams; i++) {
+ struct uas_stream *s = &fu->stream[i];
+
+ s->req_in->stream_id = i + 1;
+ s->req_out->stream_id = i + 1;
+ s->req_status->stream_id = i + 1;
+ }
+}
+
+static int uasp_prepare_reqs(struct f_uas *fu)
+{
+ int ret;
+ int i;
+ int max_streams;
+
+ if (fu->flags & USBG_USE_STREAMS)
+ max_streams = UASP_SS_EP_COMP_NUM_STREAMS;
+ else
+ max_streams = 1;
+
+ for (i = 0; i < max_streams; i++) {
+ ret = uasp_alloc_stream_res(fu, &fu->stream[i]);
+ if (ret)
+ goto err_cleanup;
+ }
+
+ ret = uasp_alloc_cmd(fu);
+ if (ret)
+ goto err_free_stream;
+ uasp_setup_stream_res(fu, max_streams);
+
+ ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
+ if (ret)
+ goto err_free_stream;
+
+ return 0;
+
+err_free_stream:
+ uasp_free_cmdreq(fu);
+
+err_cleanup:
+ if (i) {
+ do {
+ uasp_cleanup_one_stream(fu, &fu->stream[i - 1]);
+ i--;
+ } while (i);
+ }
+ pr_err("UASP: endpoint setup failed\n");
+ return ret;
+}
+
+static void uasp_set_alt(struct f_uas *fu)
+{
+ struct usb_function *f = &fu->function;
+ struct usb_gadget *gadget = f->config->cdev->gadget;
+ int ret;
+
+ fu->flags = USBG_IS_UAS;
+
+ if (gadget->speed == USB_SPEED_SUPER)
+ fu->flags |= USBG_USE_STREAMS;
+
+ config_ep_by_speed(gadget, f, fu->ep_in);
+ ret = usb_ep_enable(fu->ep_in);
+ if (ret)
+ goto err_b_in;
+
+ config_ep_by_speed(gadget, f, fu->ep_out);
+ ret = usb_ep_enable(fu->ep_out);
+ if (ret)
+ goto err_b_out;
+
+ config_ep_by_speed(gadget, f, fu->ep_cmd);
+ ret = usb_ep_enable(fu->ep_cmd);
+ if (ret)
+ goto err_cmd;
+ config_ep_by_speed(gadget, f, fu->ep_status);
+ ret = usb_ep_enable(fu->ep_status);
+ if (ret)
+ goto err_status;
+
+ ret = uasp_prepare_reqs(fu);
+ if (ret)
+ goto err_wq;
+ fu->flags |= USBG_ENABLED;
+
+ pr_info("Using the UAS protocol\n");
+ return;
+err_wq:
+ usb_ep_disable(fu->ep_status);
+err_status:
+ usb_ep_disable(fu->ep_cmd);
+err_cmd:
+ usb_ep_disable(fu->ep_out);
+err_b_out:
+ usb_ep_disable(fu->ep_in);
+err_b_in:
+ fu->flags = 0;
+}
+
+static int get_cmd_dir(const unsigned char *cdb)
+{
+ int ret;
+
+ switch (cdb[0]) {
+ case READ_6:
+ case READ_10:
+ case READ_12:
+ case READ_16:
+ case INQUIRY:
+ case MODE_SENSE:
+ case MODE_SENSE_10:
+ case SERVICE_ACTION_IN:
+ case MAINTENANCE_IN:
+ case PERSISTENT_RESERVE_IN:
+ case SECURITY_PROTOCOL_IN:
+ case ACCESS_CONTROL_IN:
+ case REPORT_LUNS:
+ case READ_BLOCK_LIMITS:
+ case READ_POSITION:
+ case READ_CAPACITY:
+ case READ_TOC:
+ case READ_FORMAT_CAPACITIES:
+ case REQUEST_SENSE:
+ ret = DMA_FROM_DEVICE;
+ break;
+
+ case WRITE_6:
+ case WRITE_10:
+ case WRITE_12:
+ case WRITE_16:
+ case MODE_SELECT:
+ case MODE_SELECT_10:
+ case WRITE_VERIFY:
+ case WRITE_VERIFY_12:
+ case PERSISTENT_RESERVE_OUT:
+ case MAINTENANCE_OUT:
+ case SECURITY_PROTOCOL_OUT:
+ case ACCESS_CONTROL_OUT:
+ ret = DMA_TO_DEVICE;
+ break;
+ case ALLOW_MEDIUM_REMOVAL:
+ case TEST_UNIT_READY:
+ case SYNCHRONIZE_CACHE:
+ case START_STOP:
+ case ERASE:
+ case REZERO_UNIT:
+ case SEEK_10:
+ case SPACE:
+ case VERIFY:
+ case WRITE_FILEMARKS:
+ ret = DMA_NONE;
+ break;
+ default:
+ pr_warn("target: Unknown data direction for SCSI Opcode "
+ "0x%02x\n", cdb[0]);
+ ret = -EINVAL;
+ }
+ return ret;
+}
+
+static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
+{
+ struct usbg_cmd *cmd = req->context;
+ struct se_cmd *se_cmd = &cmd->se_cmd;
+
+ if (req->status < 0) {
+ pr_err("%s() state %d transfer failed\n", __func__, cmd->state);
+ goto cleanup;
+ }
+
+ if (req->num_sgs == 0) {
+ sg_copy_from_buffer(se_cmd->t_data_sg,
+ se_cmd->t_data_nents,
+ cmd->data_buf,
+ se_cmd->data_length);
+ }
+
+ complete(&cmd->write_complete);
+ return;
+
+cleanup:
+ usbg_cleanup_cmd(cmd);
+}
+
+static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
+{
+ struct se_cmd *se_cmd = &cmd->se_cmd;
+ struct f_uas *fu = cmd->fu;
+ struct usb_gadget *gadget = fuas_to_gadget(fu);
+
+ if (!gadget->sg_supported) {
+ cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
+ if (!cmd->data_buf)
+ return -ENOMEM;
+
+ req->buf = cmd->data_buf;
+ } else {
+ req->buf = NULL;
+ req->num_sgs = se_cmd->t_data_nents;
+ req->sg = se_cmd->t_data_sg;
+ }
+
+ req->complete = usbg_data_write_cmpl;
+ req->length = se_cmd->data_length;
+ req->context = cmd;
+ return 0;
+}
+
+static int usbg_send_status_response(struct se_cmd *se_cmd)
+{
+ struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
+ se_cmd);
+ struct f_uas *fu = cmd->fu;
+
+ if (fu->flags & USBG_IS_BOT)
+ return bot_send_status_response(cmd);
+ else
+ return uasp_send_status_response(cmd);
+}
+
+static int usbg_send_write_request(struct se_cmd *se_cmd)
+{
+ struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
+ se_cmd);
+ struct f_uas *fu = cmd->fu;
+
+ if (fu->flags & USBG_IS_BOT)
+ return bot_send_write_request(cmd);
+ else
+ return uasp_send_write_request(cmd);
+}
+
+static int usbg_send_read_response(struct se_cmd *se_cmd)
+{
+ struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
+ se_cmd);
+ struct f_uas *fu = cmd->fu;
+
+ if (fu->flags & USBG_IS_BOT)
+ return bot_send_read_response(cmd);
+ else
+ return uasp_send_read_response(cmd);
+}
+
+static void usbg_cmd_work(struct work_struct *work)
+{
+ struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
+ struct se_cmd *se_cmd;
+ struct tcm_usbg_nexus *tv_nexus;
+ struct usbg_tpg *tpg;
+ int dir;
+
+ se_cmd = &cmd->se_cmd;
+ tpg = cmd->fu->tpg;
+ tv_nexus = tpg->tpg_nexus;
+ dir = get_cmd_dir(cmd->cmd_buf);
+ if (dir < 0) {
+ transport_init_se_cmd(se_cmd,
+ tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
+ tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
+ cmd->prio_attr, cmd->sense_iu.sense);
+
+ transport_send_check_condition_and_sense(se_cmd,
+ TCM_UNSUPPORTED_SCSI_OPCODE, 1);
+ usbg_cleanup_cmd(cmd);
+ return;
+ }
+
+ target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
+ cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
+ 0, cmd->prio_attr, dir, TARGET_SCF_UNKNOWN_SIZE);
+}
+
+static int usbg_submit_command(struct f_uas *fu,
+ void *cmdbuf, unsigned int len)
+{
+ struct command_iu *cmd_iu = cmdbuf;
+ struct usbg_cmd *cmd;
+ struct usbg_tpg *tpg;
+ struct se_cmd *se_cmd;
+ struct tcm_usbg_nexus *tv_nexus;
+ u32 cmd_len;
+ int ret;
+
+ if (cmd_iu->iu_id != IU_ID_COMMAND) {
+ pr_err("Unsupported type %d\n", cmd_iu->iu_id);
+ return -EINVAL;
+ }
+
+ cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
+ if (!cmd)
+ return -ENOMEM;
+
+ 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 = fu->tpg;
+ cmd_len = (cmd_iu->len & ~0x3) + 16;
+ if (cmd_len > USBG_MAX_CMD)
+ goto err;
+
+ memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
+
+ cmd->tag = be16_to_cpup(&cmd_iu->tag);
+ if (fu->flags & USBG_USE_STREAMS) {
+ if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
+ goto err;
+ if (!cmd->tag)
+ cmd->stream = &fu->stream[0];
+ else
+ cmd->stream = &fu->stream[cmd->tag - 1];
+ } else {
+ cmd->stream = &fu->stream[0];
+ }
+
+ tv_nexus = tpg->tpg_nexus;
+ if (!tv_nexus) {
+ pr_err("Missing nexus, ignoring command\n");
+ goto err;
+ }
+
+ switch (cmd_iu->prio_attr & 0x7) {
+ case UAS_HEAD_TAG:
+ cmd->prio_attr = MSG_HEAD_TAG;
+ break;
+ case UAS_ORDERED_TAG:
+ cmd->prio_attr = MSG_ORDERED_TAG;
+ break;
+ case UAS_ACA:
+ cmd->prio_attr = MSG_ACA_TAG;
+ break;
+ default:
+ pr_debug_once("Unsupported prio_attr: %02x.\n",
+ cmd_iu->prio_attr);
+ case UAS_SIMPLE_TAG:
+ cmd->prio_attr = MSG_SIMPLE_TAG;
+ break;
+ }
+
+ se_cmd = &cmd->se_cmd;
+ cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
+
+ INIT_WORK(&cmd->work, usbg_cmd_work);
+ ret = queue_work(tpg->workqueue, &cmd->work);
+ if (ret < 0)
+ goto err;
+
+ return 0;
+err:
+ kfree(cmd);
+ return -EINVAL;
+}
+
+static void bot_cmd_work(struct work_struct *work)
+{
+ struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
+ struct se_cmd *se_cmd;
+ struct tcm_usbg_nexus *tv_nexus;
+ struct usbg_tpg *tpg;
+ int dir;
+
+ se_cmd = &cmd->se_cmd;
+ tpg = cmd->fu->tpg;
+ tv_nexus = tpg->tpg_nexus;
+ dir = get_cmd_dir(cmd->cmd_buf);
+ if (dir < 0) {
+ transport_init_se_cmd(se_cmd,
+ tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
+ tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
+ cmd->prio_attr, cmd->sense_iu.sense);
+
+ transport_send_check_condition_and_sense(se_cmd,
+ TCM_UNSUPPORTED_SCSI_OPCODE, 1);
+ usbg_cleanup_cmd(cmd);
+ return;
+ }
+
+ target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
+ cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
+ cmd->data_len, cmd->prio_attr, dir, 0);
+}
+
+static int bot_submit_command(struct f_uas *fu,
+ void *cmdbuf, unsigned int len)
+{
+ struct bulk_cb_wrap *cbw = cmdbuf;
+ struct usbg_cmd *cmd;
+ struct usbg_tpg *tpg;
+ struct se_cmd *se_cmd;
+ struct tcm_usbg_nexus *tv_nexus;
+ u32 cmd_len;
+ int ret;
+
+ if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
+ pr_err("Wrong signature on CBW\n");
+ return -EINVAL;
+ }
+ if (len != 31) {
+ pr_err("Wrong length for CBW\n");
+ return -EINVAL;
+ }
+
+ cmd_len = cbw->Length;
+ if (cmd_len < 1 || cmd_len > 16)
+ return -EINVAL;
+
+ cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
+ if (!cmd)
+ return -ENOMEM;
+
+ 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 = fu->tpg;
+
+ memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
+
+ cmd->bot_tag = cbw->Tag;
+
+ tv_nexus = tpg->tpg_nexus;
+ if (!tv_nexus) {
+ pr_err("Missing nexus, ignoring command\n");
+ goto err;
+ }
+
+ cmd->prio_attr = MSG_SIMPLE_TAG;
+ se_cmd = &cmd->se_cmd;
+ cmd->unpacked_lun = cbw->Lun;
+ cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
+ cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
+
+ INIT_WORK(&cmd->work, bot_cmd_work);
+ ret = queue_work(tpg->workqueue, &cmd->work);
+ if (ret < 0)
+ goto err;
+
+ return 0;
+err:
+ kfree(cmd);
+ return -EINVAL;
+}
+
+/* Start fabric.c code */
+
+static int usbg_check_true(struct se_portal_group *se_tpg)
+{
+ return 1;
+}
+
+static int usbg_check_false(struct se_portal_group *se_tpg)
+{
+ return 0;
+}
+
+static char *usbg_get_fabric_name(void)
+{
+ return "usb_gadget";
+}
+
+static u8 usbg_get_fabric_proto_ident(struct se_portal_group *se_tpg)
+{
+ struct usbg_tpg *tpg = container_of(se_tpg,
+ struct usbg_tpg, se_tpg);
+ struct usbg_tport *tport = tpg->tport;
+ u8 proto_id;
+
+ switch (tport->tport_proto_id) {
+ case SCSI_PROTOCOL_SAS:
+ default:
+ proto_id = sas_get_fabric_proto_ident(se_tpg);
+ break;
+ }
+
+ return proto_id;
+}
+
+static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
+{
+ struct usbg_tpg *tpg = container_of(se_tpg,
+ struct usbg_tpg, se_tpg);
+ struct usbg_tport *tport = tpg->tport;
+
+ return &tport->tport_name[0];
+}
+
+static u16 usbg_get_tag(struct se_portal_group *se_tpg)
+{
+ struct usbg_tpg *tpg = container_of(se_tpg,
+ struct usbg_tpg, se_tpg);
+ return tpg->tport_tpgt;
+}
+
+static u32 usbg_get_default_depth(struct se_portal_group *se_tpg)
+{
+ return 1;
+}
+
+static u32 usbg_get_pr_transport_id(
+ struct se_portal_group *se_tpg,
+ struct se_node_acl *se_nacl,
+ struct t10_pr_registration *pr_reg,
+ int *format_code,
+ unsigned char *buf)
+{
+ struct usbg_tpg *tpg = container_of(se_tpg,
+ struct usbg_tpg, se_tpg);
+ struct usbg_tport *tport = tpg->tport;
+ int ret = 0;
+
+ switch (tport->tport_proto_id) {
+ case SCSI_PROTOCOL_SAS:
+ default:
+ ret = sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
+ format_code, buf);
+ break;
+ }
+
+ return ret;
+}
+
+static u32 usbg_get_pr_transport_id_len(
+ struct se_portal_group *se_tpg,
+ struct se_node_acl *se_nacl,
+ struct t10_pr_registration *pr_reg,
+ int *format_code)
+{
+ struct usbg_tpg *tpg = container_of(se_tpg,
+ struct usbg_tpg, se_tpg);
+ struct usbg_tport *tport = tpg->tport;
+ int ret = 0;
+
+ switch (tport->tport_proto_id) {
+ case SCSI_PROTOCOL_SAS:
+ default:
+ ret = sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
+ format_code);
+ break;
+ }
+
+ return ret;
+}
+
+static char *usbg_parse_pr_out_transport_id(
+ struct se_portal_group *se_tpg,
+ const char *buf,
+ u32 *out_tid_len,
+ char **port_nexus_ptr)
+{
+ struct usbg_tpg *tpg = container_of(se_tpg,
+ struct usbg_tpg, se_tpg);
+ struct usbg_tport *tport = tpg->tport;
+ char *tid = NULL;
+
+ switch (tport->tport_proto_id) {
+ case SCSI_PROTOCOL_SAS:
+ default:
+ tid = sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
+ port_nexus_ptr);
+ }
+
+ return tid;
+}
+
+static struct se_node_acl *usbg_alloc_fabric_acl(struct se_portal_group *se_tpg)
+{
+ struct usbg_nacl *nacl;
+
+ nacl = kzalloc(sizeof(struct usbg_nacl), GFP_KERNEL);
+ if (!nacl) {
+ printk(KERN_ERR "Unable to alocate struct usbg_nacl\n");
+ return NULL;
+ }
+
+ return &nacl->se_node_acl;
+}
+
+static void usbg_release_fabric_acl(
+ struct se_portal_group *se_tpg,
+ struct se_node_acl *se_nacl)
+{
+ struct usbg_nacl *nacl = container_of(se_nacl,
+ struct usbg_nacl, se_node_acl);
+ kfree(nacl);
+}
+
+static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
+{
+ return 1;
+}
+
+static int usbg_new_cmd(struct se_cmd *se_cmd)
+{
+ struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
+ se_cmd);
+ int ret;
+
+ ret = target_setup_cmd_from_cdb(se_cmd, cmd->cmd_buf);
+ if (ret)
+ return ret;
+
+ return transport_generic_map_mem_to_cmd(se_cmd, NULL, 0, NULL, 0);
+}
+
+static void usbg_cmd_release(struct kref *ref)
+{
+ struct usbg_cmd *cmd = container_of(ref, struct usbg_cmd,
+ ref);
+
+ transport_generic_free_cmd(&cmd->se_cmd, 0);
+}
+
+static void usbg_release_cmd(struct se_cmd *se_cmd)
+{
+ struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
+ se_cmd);
+ kfree(cmd->data_buf);
+ kfree(cmd);
+ return;
+}
+
+static int usbg_shutdown_session(struct se_session *se_sess)
+{
+ return 0;
+}
+
+static void usbg_close_session(struct se_session *se_sess)
+{
+ return;
+}
+
+static u32 usbg_sess_get_index(struct se_session *se_sess)
+{
+ return 0;
+}
+
+/*
+ * XXX Error recovery: return != 0 if we expect writes. Dunno when that could be
+ */
+static int usbg_write_pending_status(struct se_cmd *se_cmd)
+{
+ return 0;
+}
+
+static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
+{
+ return;
+}
+
+static u32 usbg_get_task_tag(struct se_cmd *se_cmd)
+{
+ struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
+ se_cmd);
+ struct f_uas *fu = cmd->fu;
+
+ if (fu->flags & USBG_IS_BOT)
+ return le32_to_cpu(cmd->bot_tag);
+ else
+ return cmd->tag;
+}
+
+static int usbg_get_cmd_state(struct se_cmd *se_cmd)
+{
+ return 0;
+}
+
+static int usbg_queue_tm_rsp(struct se_cmd *se_cmd)
+{
+ return 0;
+}
+
+static u16 usbg_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length)
+{
+ return 0;
+}
+
+static u16 usbg_get_fabric_sense_len(void)
+{
+ return 0;
+}
+
+static const char *usbg_check_wwn(const char *name)
+{
+ const char *n;
+ unsigned int len;
+
+ n = strstr(name, "naa.");
+ if (!n)
+ return NULL;
+ n += 4;
+ len = strlen(n);
+ if (len == 0 || len > USBG_NAMELEN - 1)
+ return NULL;
+ return n;
+}
+
+static struct se_node_acl *usbg_make_nodeacl(
+ struct se_portal_group *se_tpg,
+ struct config_group *group,
+ const char *name)
+{
+ struct se_node_acl *se_nacl, *se_nacl_new;
+ struct usbg_nacl *nacl;
+ u64 wwpn = 0;
+ u32 nexus_depth;
+ const char *wnn_name;
+
+ wnn_name = usbg_check_wwn(name);
+ if (!wnn_name)
+ return ERR_PTR(-EINVAL);
+ se_nacl_new = usbg_alloc_fabric_acl(se_tpg);
+ if (!(se_nacl_new))
+ return ERR_PTR(-ENOMEM);
+
+ nexus_depth = 1;
+ /*
+ * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
+ * when converting a NodeACL from demo mode -> explict
+ */
+ se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
+ name, nexus_depth);
+ if (IS_ERR(se_nacl)) {
+ usbg_release_fabric_acl(se_tpg, se_nacl_new);
+ return se_nacl;
+ }
+ /*
+ * Locate our struct usbg_nacl and set the FC Nport WWPN
+ */
+ nacl = container_of(se_nacl, struct usbg_nacl, se_node_acl);
+ nacl->iport_wwpn = wwpn;
+ snprintf(nacl->iport_name, sizeof(nacl->iport_name), "%s", name);
+ return se_nacl;
+}
+
+static void usbg_drop_nodeacl(struct se_node_acl *se_acl)
+{
+ struct usbg_nacl *nacl = container_of(se_acl,
+ struct usbg_nacl, se_node_acl);
+ core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
+ kfree(nacl);
+}
+
+struct usbg_tpg *the_only_tpg_I_currently_have;
+
+static struct se_portal_group *usbg_make_tpg(
+ struct se_wwn *wwn,
+ struct config_group *group,
+ const char *name)
+{
+ struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
+ tport_wwn);
+ struct usbg_tpg *tpg;
+ unsigned long tpgt;
+ int ret;
+
+ if (strstr(name, "tpgt_") != name)
+ return ERR_PTR(-EINVAL);
+ if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
+ return ERR_PTR(-EINVAL);
+ if (the_only_tpg_I_currently_have) {
+ pr_err("Until the gadget framework can't handle multiple\n");
+ pr_err("gadgets, you can't do this here.\n");
+ return ERR_PTR(-EBUSY);
+ }
+
+ tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
+ if (!tpg) {
+ printk(KERN_ERR "Unable to allocate struct usbg_tpg");
+ return ERR_PTR(-ENOMEM);
+ }
+ mutex_init(&tpg->tpg_mutex);
+ atomic_set(&tpg->tpg_port_count, 0);
+ tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
+ if (!tpg->workqueue) {
+ kfree(tpg);
+ return NULL;
+ }
+
+ tpg->tport = tport;
+ tpg->tport_tpgt = tpgt;
+
+ ret = core_tpg_register(&usbg_fabric_configfs->tf_ops, wwn,
+ &tpg->se_tpg, tpg,
+ TRANSPORT_TPG_TYPE_NORMAL);
+ if (ret < 0) {
+ destroy_workqueue(tpg->workqueue);
+ kfree(tpg);
+ return NULL;
+ }
+ the_only_tpg_I_currently_have = tpg;
+ return &tpg->se_tpg;
+}
+
+static void usbg_drop_tpg(struct se_portal_group *se_tpg)
+{
+ struct usbg_tpg *tpg = container_of(se_tpg,
+ struct usbg_tpg, se_tpg);
+
+ core_tpg_deregister(se_tpg);
+ destroy_workqueue(tpg->workqueue);
+ kfree(tpg);
+ the_only_tpg_I_currently_have = NULL;
+}
+
+static struct se_wwn *usbg_make_tport(
+ struct target_fabric_configfs *tf,
+ struct config_group *group,
+ const char *name)
+{
+ struct usbg_tport *tport;
+ const char *wnn_name;
+ u64 wwpn = 0;
+
+ wnn_name = usbg_check_wwn(name);
+ if (!wnn_name)
+ return ERR_PTR(-EINVAL);
+
+ tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
+ if (!(tport)) {
+ printk(KERN_ERR "Unable to allocate struct usbg_tport");
+ return ERR_PTR(-ENOMEM);
+ }
+ tport->tport_wwpn = wwpn;
+ snprintf(tport->tport_name, sizeof(tport->tport_name), wnn_name);
+ return &tport->tport_wwn;
+}
+
+static void usbg_drop_tport(struct se_wwn *wwn)
+{
+ struct usbg_tport *tport = container_of(wwn,
+ struct usbg_tport, tport_wwn);
+ kfree(tport);
+}
+
+/*
+ * If somebody feels like dropping the version property, go ahead.
+ */
+static ssize_t usbg_wwn_show_attr_version(
+ struct target_fabric_configfs *tf,
+ char *page)
+{
+ return sprintf(page, "usb-gadget fabric module\n");
+}
+TF_WWN_ATTR_RO(usbg, version);
+
+static struct configfs_attribute *usbg_wwn_attrs[] = {
+ &usbg_wwn_version.attr,
+ NULL,
+};
+
+static ssize_t tcm_usbg_tpg_show_enable(
+ struct se_portal_group *se_tpg,
+ char *page)
+{
+ struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
+
+ return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
+}
+
+static int usbg_attach(struct usbg_tpg *);
+static void usbg_detach(struct usbg_tpg *);
+
+static ssize_t tcm_usbg_tpg_store_enable(
+ struct se_portal_group *se_tpg,
+ const char *page,
+ size_t count)
+{
+ struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
+ unsigned long op;
+ ssize_t ret;
+
+ ret = kstrtoul(page, 0, &op);
+ if (ret < 0)
+ return -EINVAL;
+ if (op > 1)
+ return -EINVAL;
+
+ if (op && tpg->gadget_connect)
+ goto out;
+ if (!op && !tpg->gadget_connect)
+ goto out;
+
+ if (op) {
+ ret = usbg_attach(tpg);
+ if (ret)
+ goto out;
+ } else {
+ usbg_detach(tpg);
+ }
+ tpg->gadget_connect = op;
+out:
+ return count;
+}
+TF_TPG_BASE_ATTR(tcm_usbg, enable, S_IRUGO | S_IWUSR);
+
+static ssize_t tcm_usbg_tpg_show_nexus(
+ struct se_portal_group *se_tpg,
+ char *page)
+{
+ struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
+ struct tcm_usbg_nexus *tv_nexus;
+ ssize_t ret;
+
+ mutex_lock(&tpg->tpg_mutex);
+ tv_nexus = tpg->tpg_nexus;
+ if (!tv_nexus) {
+ ret = -ENODEV;
+ goto out;
+ }
+ ret = snprintf(page, PAGE_SIZE, "%s\n",
+ tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
+out:
+ mutex_unlock(&tpg->tpg_mutex);
+ return ret;
+}
+
+static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
+{
+ struct se_portal_group *se_tpg;
+ struct tcm_usbg_nexus *tv_nexus;
+ int ret;
+
+ mutex_lock(&tpg->tpg_mutex);
+ if (tpg->tpg_nexus) {
+ ret = -EEXIST;
+ pr_debug("tpg->tpg_nexus already exists\n");
+ goto err_unlock;
+ }
+ se_tpg = &tpg->se_tpg;
+
+ ret = -ENOMEM;
+ tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
+ if (!tv_nexus) {
+ pr_err("Unable to allocate struct tcm_vhost_nexus\n");
+ goto err_unlock;
+ }
+ tv_nexus->tvn_se_sess = transport_init_session();
+ if (IS_ERR(tv_nexus->tvn_se_sess))
+ goto err_free;
+
+ /*
+ * Since we are running in 'demo mode' this call with generate a
+ * struct se_node_acl for the tcm_vhost struct se_portal_group with
+ * the SCSI Initiator port name of the passed configfs group 'name'.
+ */
+ tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
+ se_tpg, name);
+ if (!tv_nexus->tvn_se_sess->se_node_acl) {
+ pr_debug("core_tpg_check_initiator_node_acl() failed"
+ " for %s\n", name);
+ goto err_session;
+ }
+ /*
+ * Now register the TCM vHost virtual I_T Nexus as active with the
+ * call to __transport_register_session()
+ */
+ __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
+ tv_nexus->tvn_se_sess, tv_nexus);
+ tpg->tpg_nexus = tv_nexus;
+ mutex_unlock(&tpg->tpg_mutex);
+ return 0;
+
+err_session:
+ transport_free_session(tv_nexus->tvn_se_sess);
+err_free:
+ kfree(tv_nexus);
+err_unlock:
+ mutex_unlock(&tpg->tpg_mutex);
+ return ret;
+}
+
+static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
+{
+ struct se_session *se_sess;
+ struct tcm_usbg_nexus *tv_nexus;
+ int ret = -ENODEV;
+
+ mutex_lock(&tpg->tpg_mutex);
+ tv_nexus = tpg->tpg_nexus;
+ if (!tv_nexus)
+ goto out;
+
+ se_sess = tv_nexus->tvn_se_sess;
+ if (!se_sess)
+ goto out;
+
+ if (atomic_read(&tpg->tpg_port_count)) {
+ ret = -EPERM;
+ pr_err("Unable to remove Host I_T Nexus with"
+ " active TPG port count: %d\n",
+ atomic_read(&tpg->tpg_port_count));
+ goto out;
+ }
+
+ pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
+ tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
+ /*
+ * Release the SCSI I_T Nexus to the emulated vHost Target Port
+ */
+ transport_deregister_session(tv_nexus->tvn_se_sess);
+ tpg->tpg_nexus = NULL;
+
+ kfree(tv_nexus);
+out:
+ mutex_unlock(&tpg->tpg_mutex);
+ return 0;
+}
+
+static ssize_t tcm_usbg_tpg_store_nexus(
+ struct se_portal_group *se_tpg,
+ const char *page,
+ size_t count)
+{
+ struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
+ unsigned char i_port[USBG_NAMELEN], *ptr;
+ int ret;
+
+ if (!strncmp(page, "NULL", 4)) {
+ ret = tcm_usbg_drop_nexus(tpg);
+ return (!ret) ? count : ret;
+ }
+ if (strlen(page) > USBG_NAMELEN) {
+ pr_err("Emulated NAA Sas Address: %s, exceeds"
+ " max: %d\n", page, USBG_NAMELEN);
+ return -EINVAL;
+ }
+ snprintf(i_port, USBG_NAMELEN, "%s", page);
+
+ ptr = strstr(i_port, "naa.");
+ if (!ptr) {
+ pr_err("Missing 'naa.' prefix\n");
+ return -EINVAL;
+ }
+
+ if (i_port[strlen(i_port) - 1] == '\n')
+ i_port[strlen(i_port) - 1] = '\0';
+
+ ret = tcm_usbg_make_nexus(tpg, &i_port[4]);
+ if (ret < 0)
+ return ret;
+ return count;
+}
+TF_TPG_BASE_ATTR(tcm_usbg, nexus, S_IRUGO | S_IWUSR);
+
+static struct configfs_attribute *usbg_base_attrs[] = {
+ &tcm_usbg_tpg_enable.attr,
+ &tcm_usbg_tpg_nexus.attr,
+ NULL,
+};
+
+static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
+{
+ struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
+
+ atomic_inc(&tpg->tpg_port_count);
+ smp_mb__after_atomic_inc();
+ return 0;
+}
+
+static void usbg_port_unlink(struct se_portal_group *se_tpg,
+ struct se_lun *se_lun)
+{
+ struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
+
+ atomic_dec(&tpg->tpg_port_count);
+ smp_mb__after_atomic_dec();
+}
+
+static int usbg_check_stop_free(struct se_cmd *se_cmd)
+{
+ struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
+ se_cmd);
+
+ kref_put(&cmd->ref, usbg_cmd_release);
+ return 1;
+}
+
+static struct target_core_fabric_ops usbg_ops = {
+ .get_fabric_name = usbg_get_fabric_name,
+ .get_fabric_proto_ident = usbg_get_fabric_proto_ident,
+ .tpg_get_wwn = usbg_get_fabric_wwn,
+ .tpg_get_tag = usbg_get_tag,
+ .tpg_get_default_depth = usbg_get_default_depth,
+ .tpg_get_pr_transport_id = usbg_get_pr_transport_id,
+ .tpg_get_pr_transport_id_len = usbg_get_pr_transport_id_len,
+ .tpg_parse_pr_out_transport_id = usbg_parse_pr_out_transport_id,
+ .tpg_check_demo_mode = usbg_check_true,
+ .tpg_check_demo_mode_cache = usbg_check_false,
+ .tpg_check_demo_mode_write_protect = usbg_check_false,
+ .tpg_check_prod_mode_write_protect = usbg_check_false,
+ .tpg_alloc_fabric_acl = usbg_alloc_fabric_acl,
+ .tpg_release_fabric_acl = usbg_release_fabric_acl,
+ .tpg_get_inst_index = usbg_tpg_get_inst_index,
+ .new_cmd_map = usbg_new_cmd,
+ .release_cmd = usbg_release_cmd,
+ .shutdown_session = usbg_shutdown_session,
+ .close_session = usbg_close_session,
+ .sess_get_index = usbg_sess_get_index,
+ .sess_get_initiator_sid = NULL,
+ .write_pending = usbg_send_write_request,
+ .write_pending_status = usbg_write_pending_status,
+ .set_default_node_attributes = usbg_set_default_node_attrs,
+ .get_task_tag = usbg_get_task_tag,
+ .get_cmd_state = usbg_get_cmd_state,
+ .queue_data_in = usbg_send_read_response,
+ .queue_status = usbg_send_status_response,
+ .queue_tm_rsp = usbg_queue_tm_rsp,
+ .get_fabric_sense_len = usbg_get_fabric_sense_len,
+ .set_fabric_sense_len = usbg_set_fabric_sense_len,
+ .check_stop_free = usbg_check_stop_free,
+
+ .fabric_make_wwn = usbg_make_tport,
+ .fabric_drop_wwn = usbg_drop_tport,
+ .fabric_make_tpg = usbg_make_tpg,
+ .fabric_drop_tpg = usbg_drop_tpg,
+ .fabric_post_link = usbg_port_link,
+ .fabric_pre_unlink = usbg_port_unlink,
+ .fabric_make_np = NULL,
+ .fabric_drop_np = NULL,
+ .fabric_make_nodeacl = usbg_make_nodeacl,
+ .fabric_drop_nodeacl = usbg_drop_nodeacl,
+};
+
+static int usbg_register_configfs(void)
+{
+ struct target_fabric_configfs *fabric;
+ int ret;
+
+ fabric = target_fabric_configfs_init(THIS_MODULE, "usb_gadget");
+ if (IS_ERR(fabric)) {
+ printk(KERN_ERR "target_fabric_configfs_init() failed\n");
+ return PTR_ERR(fabric);
+ }
+
+ fabric->tf_ops = usbg_ops;
+ TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = usbg_wwn_attrs;
+ TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = usbg_base_attrs;
+ TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
+ TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
+ TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
+ TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
+ TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
+ TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
+ TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
+ ret = target_fabric_configfs_register(fabric);
+ if (ret < 0) {
+ printk(KERN_ERR "target_fabric_configfs_register() failed"
+ " for usb-gadget\n");
+ return ret;
+ }
+ usbg_fabric_configfs = fabric;
+ return 0;
+};
+
+static void usbg_deregister_configfs(void)
+{
+ if (!(usbg_fabric_configfs))
+ return;
+
+ target_fabric_configfs_deregister(usbg_fabric_configfs);
+ usbg_fabric_configfs = NULL;
+};
+
+/* Start gadget.c code */
+
+static struct usb_interface_descriptor bot_intf_desc = {
+ .bLength = sizeof(bot_intf_desc),
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bAlternateSetting = 0,
+ .bNumEndpoints = 2,
+ .bAlternateSetting = USB_G_ALT_INT_BBB,
+ .bInterfaceClass = USB_CLASS_MASS_STORAGE,
+ .bInterfaceSubClass = USB_SC_SCSI,
+ .bInterfaceProtocol = USB_PR_BULK,
+ .iInterface = USB_G_STR_INT_UAS,
+};
+
+static struct usb_interface_descriptor uasp_intf_desc = {
+ .bLength = sizeof(uasp_intf_desc),
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bNumEndpoints = 4,
+ .bAlternateSetting = USB_G_ALT_INT_UAS,
+ .bInterfaceClass = USB_CLASS_MASS_STORAGE,
+ .bInterfaceSubClass = USB_SC_SCSI,
+ .bInterfaceProtocol = USB_PR_UAS,
+ .iInterface = USB_G_STR_INT_BBB,
+};
+
+static struct usb_endpoint_descriptor uasp_bi_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = cpu_to_le16(512),
+};
+
+static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+};
+
+static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
+ .bLength = sizeof(uasp_bi_pipe_desc),
+ .bDescriptorType = USB_DT_PIPE_USAGE,
+ .bPipeID = DATA_IN_PIPE_ID,
+};
+
+static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = cpu_to_le16(1024),
+};
+
+static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
+ .bLength = sizeof(uasp_bi_ep_comp_desc),
+ .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+ .bMaxBurst = 0,
+ .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
+ .wBytesPerInterval = 0,
+};
+
+static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
+ .bLength = sizeof(bot_bi_ep_comp_desc),
+ .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+ .bMaxBurst = 0,
+};
+
+static struct usb_endpoint_descriptor uasp_bo_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = cpu_to_le16(512),
+};
+
+static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+};
+
+static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
+ .bLength = sizeof(uasp_bo_pipe_desc),
+ .bDescriptorType = USB_DT_PIPE_USAGE,
+ .bPipeID = DATA_OUT_PIPE_ID,
+};
+
+static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = cpu_to_le16(0x400),
+};
+
+static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
+ .bLength = sizeof(uasp_bo_ep_comp_desc),
+ .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+ .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
+};
+
+static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
+ .bLength = sizeof(bot_bo_ep_comp_desc),
+ .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+};
+
+static struct usb_endpoint_descriptor uasp_status_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = cpu_to_le16(512),
+};
+
+static struct usb_endpoint_descriptor uasp_fs_status_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+};
+
+static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
+ .bLength = sizeof(uasp_status_pipe_desc),
+ .bDescriptorType = USB_DT_PIPE_USAGE,
+ .bPipeID = STATUS_PIPE_ID,
+};
+
+static struct usb_endpoint_descriptor uasp_ss_status_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = cpu_to_le16(1024),
+};
+
+static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
+ .bLength = sizeof(uasp_status_in_ep_comp_desc),
+ .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+ .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
+};
+
+static struct usb_endpoint_descriptor uasp_cmd_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = cpu_to_le16(512),
+};
+
+static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+};
+
+static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
+ .bLength = sizeof(uasp_cmd_pipe_desc),
+ .bDescriptorType = USB_DT_PIPE_USAGE,
+ .bPipeID = CMD_PIPE_ID,
+};
+
+static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = cpu_to_le16(1024),
+};
+
+static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
+ .bLength = sizeof(uasp_cmd_comp_desc),
+ .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+};
+
+static struct usb_descriptor_header *uasp_fs_function_desc[] = {
+ (struct usb_descriptor_header *) &bot_intf_desc,
+ (struct usb_descriptor_header *) &uasp_fs_bi_desc,
+ (struct usb_descriptor_header *) &uasp_fs_bo_desc,
+
+ (struct usb_descriptor_header *) &uasp_intf_desc,
+ (struct usb_descriptor_header *) &uasp_fs_bi_desc,
+ (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
+ (struct usb_descriptor_header *) &uasp_fs_bo_desc,
+ (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
+ (struct usb_descriptor_header *) &uasp_fs_status_desc,
+ (struct usb_descriptor_header *) &uasp_status_pipe_desc,
+ (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
+ (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
+};
+
+static struct usb_descriptor_header *uasp_hs_function_desc[] = {
+ (struct usb_descriptor_header *) &bot_intf_desc,
+ (struct usb_descriptor_header *) &uasp_bi_desc,
+ (struct usb_descriptor_header *) &uasp_bo_desc,
+
+ (struct usb_descriptor_header *) &uasp_intf_desc,
+ (struct usb_descriptor_header *) &uasp_bi_desc,
+ (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
+ (struct usb_descriptor_header *) &uasp_bo_desc,
+ (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
+ (struct usb_descriptor_header *) &uasp_status_desc,
+ (struct usb_descriptor_header *) &uasp_status_pipe_desc,
+ (struct usb_descriptor_header *) &uasp_cmd_desc,
+ (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
+ NULL,
+};
+
+static struct usb_descriptor_header *uasp_ss_function_desc[] = {
+ (struct usb_descriptor_header *) &bot_intf_desc,
+ (struct usb_descriptor_header *) &uasp_ss_bi_desc,
+ (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
+ (struct usb_descriptor_header *) &uasp_ss_bo_desc,
+ (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
+
+ (struct usb_descriptor_header *) &uasp_intf_desc,
+ (struct usb_descriptor_header *) &uasp_ss_bi_desc,
+ (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
+ (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
+ (struct usb_descriptor_header *) &uasp_ss_bo_desc,
+ (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
+ (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
+ (struct usb_descriptor_header *) &uasp_ss_status_desc,
+ (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
+ (struct usb_descriptor_header *) &uasp_status_pipe_desc,
+ (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
+ (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
+ (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
+ NULL,
+};
+
+#define UAS_VENDOR_ID 0x0525 /* NetChip */
+#define UAS_PRODUCT_ID 0xa4a5 /* Linux-USB File-backed Storage Gadget */
+
+static struct usb_device_descriptor usbg_device_desc = {
+ .bLength = sizeof(usbg_device_desc),
+ .bDescriptorType = USB_DT_DEVICE,
+ .bcdUSB = cpu_to_le16(0x0200),
+ .bDeviceClass = USB_CLASS_PER_INTERFACE,
+ .idVendor = cpu_to_le16(UAS_VENDOR_ID),
+ .idProduct = cpu_to_le16(UAS_PRODUCT_ID),
+ .iManufacturer = USB_G_STR_MANUFACTOR,
+ .iProduct = USB_G_STR_PRODUCT,
+ .iSerialNumber = USB_G_STR_SERIAL,
+
+ .bNumConfigurations = 1,
+};
+
+static struct usb_string usbg_us_strings[] = {
+ { USB_G_STR_MANUFACTOR, "Target Manufactor"},
+ { USB_G_STR_PRODUCT, "Target Product"},
+ { USB_G_STR_SERIAL, "000000000001"},
+ { USB_G_STR_CONFIG, "default config"},
+ { USB_G_STR_INT_UAS, "USB Attached SCSI"},
+ { USB_G_STR_INT_BBB, "Bulk Only Transport"},
+ { },
+};
+
+static struct usb_gadget_strings usbg_stringtab = {
+ .language = 0x0409,
+ .strings = usbg_us_strings,
+};
+
+static struct usb_gadget_strings *usbg_strings[] = {
+ &usbg_stringtab,
+ NULL,
+};
+
+static int guas_unbind(struct usb_composite_dev *cdev)
+{
+ return 0;
+}
+
+static struct usb_configuration usbg_config_driver = {
+ .label = "Linux Target",
+ .bConfigurationValue = 1,
+ .iConfiguration = USB_G_STR_CONFIG,
+ .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
+};
+
+static void give_back_ep(struct usb_ep **pep)
+{
+ struct usb_ep *ep = *pep;
+ if (!ep)
+ return;
+ ep->driver_data = NULL;
+}
+
+static int usbg_bind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct f_uas *fu = to_f_uas(f);
+ struct usb_gadget *gadget = c->cdev->gadget;
+ struct usb_ep *ep;
+ int iface;
+
+ iface = usb_interface_id(c, f);
+ if (iface < 0)
+ return iface;
+
+ bot_intf_desc.bInterfaceNumber = iface;
+ uasp_intf_desc.bInterfaceNumber = iface;
+ fu->iface = iface;
+ ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
+ &uasp_bi_ep_comp_desc);
+ if (!ep)
+ goto ep_fail;
+
+ ep->driver_data = fu;
+ fu->ep_in = ep;
+
+ ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
+ &uasp_bo_ep_comp_desc);
+ if (!ep)
+ goto ep_fail;
+ ep->driver_data = fu;
+ fu->ep_out = ep;
+
+ ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
+ &uasp_status_in_ep_comp_desc);
+ if (!ep)
+ goto ep_fail;
+ ep->driver_data = fu;
+ fu->ep_status = ep;
+
+ ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
+ &uasp_cmd_comp_desc);
+ if (!ep)
+ goto ep_fail;
+ ep->driver_data = fu;
+ fu->ep_cmd = ep;
+
+ /* Assume endpoint addresses are the same for both speeds */
+ uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
+ uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
+ uasp_status_desc.bEndpointAddress =
+ uasp_ss_status_desc.bEndpointAddress;
+ uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
+
+ uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
+ uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
+ uasp_fs_status_desc.bEndpointAddress =
+ uasp_ss_status_desc.bEndpointAddress;
+ uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
+
+ return 0;
+ep_fail:
+ pr_err("Can't claim all required eps\n");
+
+ give_back_ep(&fu->ep_in);
+ give_back_ep(&fu->ep_out);
+ give_back_ep(&fu->ep_status);
+ give_back_ep(&fu->ep_cmd);
+ return -ENOTSUPP;
+}
+
+static void usbg_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct f_uas *fu = to_f_uas(f);
+
+ kfree(fu);
+}
+
+struct guas_setup_wq {
+ struct work_struct work;
+ struct f_uas *fu;
+ unsigned int alt;
+};
+
+static void usbg_delayed_set_alt(struct work_struct *wq)
+{
+ struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
+ work);
+ struct f_uas *fu = work->fu;
+ int alt = work->alt;
+
+ kfree(work);
+
+ if (fu->flags & USBG_IS_BOT)
+ bot_cleanup_old_alt(fu);
+ if (fu->flags & USBG_IS_UAS)
+ uasp_cleanup_old_alt(fu);
+
+ if (alt == USB_G_ALT_INT_BBB)
+ bot_set_alt(fu);
+ else if (alt == USB_G_ALT_INT_UAS)
+ uasp_set_alt(fu);
+ usb_composite_setup_continue(fu->function.config->cdev);
+}
+
+static int usbg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
+{
+ struct f_uas *fu = to_f_uas(f);
+
+ if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
+ struct guas_setup_wq *work;
+
+ work = kmalloc(sizeof(*work), GFP_ATOMIC);
+ if (!work)
+ return -ENOMEM;
+ INIT_WORK(&work->work, usbg_delayed_set_alt);
+ work->fu = fu;
+ work->alt = alt;
+ schedule_work(&work->work);
+ return USB_GADGET_DELAYED_STATUS;
+ }
+ return -EOPNOTSUPP;
+}
+
+static void usbg_disable(struct usb_function *f)
+{
+ struct f_uas *fu = to_f_uas(f);
+
+ if (fu->flags & USBG_IS_UAS)
+ uasp_cleanup_old_alt(fu);
+ else if (fu->flags & USBG_IS_BOT)
+ bot_cleanup_old_alt(fu);
+ fu->flags = 0;
+}
+
+static int usbg_setup(struct usb_function *f,
+ const struct usb_ctrlrequest *ctrl)
+{
+ struct f_uas *fu = to_f_uas(f);
+
+ if (!(fu->flags & USBG_IS_BOT))
+ return -EOPNOTSUPP;
+
+ return usbg_bot_setup(f, ctrl);
+}
+
+static int usbg_cfg_bind(struct usb_configuration *c)
+{
+ struct f_uas *fu;
+ int ret;
+
+ fu = kzalloc(sizeof(*fu), GFP_KERNEL);
+ if (!fu)
+ return -ENOMEM;
+ fu->function.name = "Target Function";
+ fu->function.descriptors = uasp_fs_function_desc;
+ fu->function.hs_descriptors = uasp_hs_function_desc;
+ fu->function.ss_descriptors = uasp_ss_function_desc;
+ fu->function.bind = usbg_bind;
+ fu->function.unbind = usbg_unbind;
+ fu->function.set_alt = usbg_set_alt;
+ fu->function.setup = usbg_setup;
+ fu->function.disable = usbg_disable;
+ fu->tpg = the_only_tpg_I_currently_have;
+
+ ret = usb_add_function(c, &fu->function);
+ if (ret)
+ goto err;
+
+ return 0;
+err:
+ kfree(fu);
+ return ret;
+}
+
+static int usb_target_bind(struct usb_composite_dev *cdev)
+{
+ int ret;
+
+ ret = usb_add_config(cdev, &usbg_config_driver,
+ usbg_cfg_bind);
+ return 0;
+}
+
+static struct usb_composite_driver usbg_driver = {
+ .name = "g_target",
+ .dev = &usbg_device_desc,
+ .strings = usbg_strings,
+ .max_speed = USB_SPEED_SUPER,
+ .unbind = guas_unbind,
+};
+
+static int usbg_attach(struct usbg_tpg *tpg)
+{
+ return usb_composite_probe(&usbg_driver, usb_target_bind);
+}
+
+static void usbg_detach(struct usbg_tpg *tpg)
+{
+ usb_composite_unregister(&usbg_driver);
+}
+
+static int __init usb_target_gadget_init(void)
+{
+ int ret;
+
+ ret = usbg_register_configfs();
+ return ret;
+}
+module_init(usb_target_gadget_init);
+
+static void __exit usb_target_gadget_exit(void)
+{
+ usbg_deregister_configfs();
+}
+module_exit(usb_target_gadget_exit);
+
+MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
+MODULE_DESCRIPTION("usb-gadget fabric");
+MODULE_LICENSE("GPL v2");
projects / users / hch / configfs.git / commitdiff