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f_tcm.c
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f_tcm.c
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// SPDX-License-Identifier: GPL-2.0
/* 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>
*/
#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_tcq.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include <asm/unaligned.h>
#include "tcm.h"
#include "u_tcm.h"
#include "configfs.h"
#define TPG_INSTANCES 1
struct tpg_instance {
struct usb_function_instance *func_inst;
struct usbg_tpg *tpg;
};
static struct tpg_instance tpg_instances[TPG_INSTANCES];
static DEFINE_MUTEX(tpg_instances_lock);
static inline struct f_uas *to_f_uas(struct usb_function *f)
{
return container_of(f, struct f_uas, function);
}
/* 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;
transport_generic_free_cmd(&cmd->se_cmd, 0);
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;
unsigned int csw_stat;
csw_stat = cmd->csw_code;
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);
target_execute_cmd(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;
}
static 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_in, 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);
case US_BULK_RESET_REQUEST:
/* XXX maybe we should remove previous requests for IN + OUT */
bot_enqueue_cmd_cbw(fu);
return 0;
}
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:
transport_generic_free_cmd(&cmd->se_cmd, 0);
usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
break;
default:
BUG();
}
return;
cleanup:
transport_generic_free_cmd(&cmd->se_cmd, 0);
}
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);
target_execute_cmd(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_out, stream->req_out);
stream->req_out = NULL;
err_out:
usb_ep_free_request(fu->ep_in, stream->req_in);
stream->req_in = 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_16:
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:
#define CMD_DIR_MSG "target: Unknown data direction for SCSI Opcode 0x%02x\n"
pr_warn(CMD_DIR_MSG, cdb[0]);
#undef CMD_DIR_MSG
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:
transport_generic_free_cmd(&cmd->se_cmd, 0);
}
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;
}