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lastdragon
2026-09-06 12:53:21 -06:00
parent 662efe3c2a
commit ad2088d178
94853 changed files with 43200404 additions and 0 deletions
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linux-7.2.3/drivers/scsi/ibmvscsi_tgt/Makefile
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# SPDX-License-Identifier: GPL-2.0-only
obj-$(CONFIG_SCSI_IBMVSCSIS) += ibmvscsis.o
ibmvscsis-y := libsrp.o ibmvscsi_tgt.o
linux-7.2.3/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
+4071
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linux-7.2.3/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.h
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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*******************************************************************************
* IBM Virtual SCSI Target Driver
* Copyright (C) 2003-2005 Dave Boutcher (boutcher@us.ibm.com) IBM Corp.
* Santiago Leon (santil@us.ibm.com) IBM Corp.
* Linda Xie (lxie@us.ibm.com) IBM Corp.
*
* Copyright (C) 2005-2011 FUJITA Tomonori <tomof@acm.org>
* Copyright (C) 2010 Nicholas A. Bellinger <nab@kernel.org>
* Copyright (C) 2016 Bryant G. Ly <bryantly@linux.vnet.ibm.com> IBM Corp.
*
* Authors: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
* Authors: Michael Cyr <mikecyr@linux.vnet.ibm.com>
*
****************************************************************************/
#ifndef __H_IBMVSCSI_TGT
#define __H_IBMVSCSI_TGT
#include <linux/interrupt.h>
#include "libsrp.h"
#define SYS_ID_NAME_LEN 64
#define PARTITION_NAMELEN 96
#define IBMVSCSIS_NAMELEN 32
#define MSG_HI 0
#define MSG_LOW 1
#define MAX_CMD_Q_PAGES 4
#define CRQ_PER_PAGE (PAGE_SIZE / sizeof(struct viosrp_crq))
/* in terms of number of elements */
#define DEFAULT_CMD_Q_SIZE CRQ_PER_PAGE
#define MAX_CMD_Q_SIZE (DEFAULT_CMD_Q_SIZE * MAX_CMD_Q_PAGES)
#define SRP_VIOLATION 0x102 /* general error code */
/*
* SRP buffer formats defined as of 16.a supported by this driver.
*/
#define SUPPORTED_FORMATS ((SRP_DATA_DESC_DIRECT << 1) | \
(SRP_DATA_DESC_INDIRECT << 1))
#define SCSI_LUN_ADDR_METHOD_FLAT 1
struct dma_window {
u32 liobn; /* Unique per vdevice */
u64 tce_base; /* Physical location of the TCE table */
u64 tce_size; /* Size of the TCE table in bytes */
};
struct target_dds {
u64 unit_id; /* 64 bit will force alignment */
#define NUM_DMA_WINDOWS 2
#define LOCAL 0
#define REMOTE 1
struct dma_window window[NUM_DMA_WINDOWS];
/* root node property "ibm,partition-no" */
uint partition_num;
char partition_name[PARTITION_NAMELEN];
};
#define MAX_NUM_PORTS 1
#define MAX_H_COPY_RDMA (128 * 1024)
#define MAX_EYE 64
/* Return codes */
#define ADAPT_SUCCESS 0L
/* choose error codes that do not conflict with PHYP */
#define ERROR -40L
struct format_code {
u8 reserved;
u8 buffers;
};
struct client_info {
#define SRP_VERSION "16.a"
char srp_version[8];
/* root node property ibm,partition-name */
char partition_name[PARTITION_NAMELEN];
/* root node property ibm,partition-no */
u32 partition_number;
/* initially 1 */
u32 mad_version;
u32 os_type;
};
/*
* Changing this constant changes the number of seconds to wait before
* considering the client will never service its queue again.
*/
#define SECONDS_TO_CONSIDER_FAILED 30
/*
* These constants set the polling period used to determine if the client
* has freed at least one element in the response queue.
*/
#define WAIT_SECONDS 1
#define WAIT_NANO_SECONDS 5000
#define MAX_TIMER_POPS ((1000000 / WAIT_NANO_SECONDS) * \
SECONDS_TO_CONSIDER_FAILED)
/*
* general purpose timer control block
* which can be used for multiple functions
*/
struct timer_cb {
struct hrtimer timer;
/*
* how long has it been since the client
* serviced the queue. The variable is incrmented
* in the service_wait_q routine and cleared
* in send messages
*/
int timer_pops;
/* the timer is started */
bool started;
};
struct cmd_queue {
/* kva */
struct viosrp_crq *base_addr;
dma_addr_t crq_token;
/* used to maintain index */
uint mask;
/* current element */
uint index;
int size;
};
#define SCSOLNT_RESP_SHIFT 1
#define UCSOLNT_RESP_SHIFT 2
#define SCSOLNT BIT(SCSOLNT_RESP_SHIFT)
#define UCSOLNT BIT(UCSOLNT_RESP_SHIFT)
enum cmd_type {
SCSI_CDB = 0x01,
TASK_MANAGEMENT = 0x02,
/* MAD or addressed to port 0 */
ADAPTER_MAD = 0x04,
UNSET_TYPE = 0x08,
};
struct iu_rsp {
u8 format;
u8 sol_not;
u16 len;
/* tag is just to help client identify cmd, so don't translate be/le */
u64 tag;
};
struct ibmvscsis_cmd {
struct list_head list;
/* Used for TCM Core operations */
struct se_cmd se_cmd;
struct iu_entry *iue;
struct iu_rsp rsp;
struct work_struct work;
struct scsi_info *adapter;
struct ibmvscsis_cmd *abort_cmd;
/* Sense buffer that will be mapped into outgoing status */
unsigned char sense_buf[TRANSPORT_SENSE_BUFFER];
u64 init_time;
#define CMD_FAST_FAIL BIT(0)
#define DELAY_SEND BIT(1)
u32 flags;
char type;
};
struct ibmvscsis_nexus {
struct se_session *se_sess;
};
struct ibmvscsis_tport {
/* SCSI protocol the tport is providing */
u8 tport_proto_id;
/* ASCII formatted WWPN for SRP Target port */
char tport_name[IBMVSCSIS_NAMELEN];
/* Returned by ibmvscsis_make_tport() */
struct se_wwn tport_wwn;
/* Returned by ibmvscsis_make_tpg() */
struct se_portal_group se_tpg;
/* ibmvscsis port target portal group tag for TCM */
u16 tport_tpgt;
/* Pointer to TCM session for I_T Nexus */
struct ibmvscsis_nexus *ibmv_nexus;
bool enabled;
bool releasing;
};
struct scsi_info {
struct list_head list;
char eye[MAX_EYE];
/* commands waiting for space on repsonse queue */
struct list_head waiting_rsp;
#define NO_QUEUE 0x00
#define WAIT_ENABLED 0X01
#define WAIT_CONNECTION 0x04
/* have established a connection */
#define CONNECTED 0x08
/* at least one port is processing SRP IU */
#define SRP_PROCESSING 0x10
/* remove request received */
#define UNCONFIGURING 0x20
/* disconnect by letting adapter go idle, no error */
#define WAIT_IDLE 0x40
/* disconnecting to clear an error */
#define ERR_DISCONNECT 0x80
/* disconnect to clear error state, then come back up */
#define ERR_DISCONNECT_RECONNECT 0x100
/* disconnected after clearing an error */
#define ERR_DISCONNECTED 0x200
/* A series of errors caused unexpected errors */
#define UNDEFINED 0x400
u16 state;
int fast_fail;
struct target_dds dds;
char *cmd_pool;
/* list of free commands */
struct list_head free_cmd;
/* command elements ready for scheduler */
struct list_head schedule_q;
/* commands sent to TCM */
struct list_head active_q;
caddr_t *map_buf;
/* ioba of map buffer */
dma_addr_t map_ioba;
/* allowable number of outstanding SRP requests */
int request_limit;
/* extra credit */
int credit;
/* outstanding transactions against credit limit */
int debit;
/* allow only one outstanding mad request */
#define PROCESSING_MAD 0x00002
/* Waiting to go idle */
#define WAIT_FOR_IDLE 0x00004
/* H_REG_CRQ called */
#define CRQ_CLOSED 0x00010
/* detected that client has failed */
#define CLIENT_FAILED 0x00040
/* detected that transport event occurred */
#define TRANS_EVENT 0x00080
/* don't attempt to send anything to the client */
#define RESPONSE_Q_DOWN 0x00100
/* request made to schedule disconnect handler */
#define SCHEDULE_DISCONNECT 0x00400
/* disconnect handler is scheduled */
#define DISCONNECT_SCHEDULED 0x00800
/* remove function is sleeping */
#define CFG_SLEEPING 0x01000
/* Register for Prepare for Suspend Transport Events */
#define PREP_FOR_SUSPEND_ENABLED 0x02000
/* Prepare for Suspend event sent */
#define PREP_FOR_SUSPEND_PENDING 0x04000
/* Resume from Suspend event sent */
#define PREP_FOR_SUSPEND_ABORTED 0x08000
/* Prepare for Suspend event overwrote another CRQ entry */
#define PREP_FOR_SUSPEND_OVERWRITE 0x10000
u32 flags;
/* adapter lock */
spinlock_t intr_lock;
/* information needed to manage command queue */
struct cmd_queue cmd_q;
/* used in hcall to copy response back into srp buffer */
u64 empty_iu_id;
/* used in crq, to tag what iu the response is for */
u64 empty_iu_tag;
uint new_state;
uint resume_state;
/* control block for the response queue timer */
struct timer_cb rsp_q_timer;
/* keep last client to enable proper accounting */
struct client_info client_data;
/* what can this client do */
u32 client_cap;
/*
* The following two fields capture state and flag changes that
* can occur when the lock is given up. In the orginal design,
* the lock was held during calls into phyp;
* however, phyp did not meet PAPR architecture. This is
* a work around.
*/
u16 phyp_acr_state;
u32 phyp_acr_flags;
struct workqueue_struct *work_q;
struct completion wait_idle;
struct completion unconfig;
struct device dev;
struct vio_dev *dma_dev;
struct srp_target target;
struct ibmvscsis_tport tport;
struct tasklet_struct work_task;
struct work_struct proc_work;
};
/*
* Provide a constant that allows software to detect the adapter is
* disconnecting from the client from one of several states.
*/
#define IS_DISCONNECTING (UNCONFIGURING | ERR_DISCONNECT_RECONNECT | \
ERR_DISCONNECT)
/*
* Provide a constant that can be used with interrupt handling that
* essentially lets the interrupt handler know that all requests should
* be thrown out,
*/
#define DONT_PROCESS_STATE (IS_DISCONNECTING | UNDEFINED | \
ERR_DISCONNECTED | WAIT_IDLE)
/*
* If any of these flag bits are set then do not allow the interrupt
* handler to schedule the off level handler.
*/
#define BLOCK (DISCONNECT_SCHEDULED)
/* State and transition events that stop the interrupt handler */
#define TARGET_STOP(VSCSI) (long)(((VSCSI)->state & DONT_PROCESS_STATE) | \
((VSCSI)->flags & BLOCK))
#define PREP_FOR_SUSPEND_FLAGS (PREP_FOR_SUSPEND_ENABLED | \
PREP_FOR_SUSPEND_PENDING | \
PREP_FOR_SUSPEND_ABORTED | \
PREP_FOR_SUSPEND_OVERWRITE)
/* flag bit that are not reset during disconnect */
#define PRESERVE_FLAG_FIELDS (PREP_FOR_SUSPEND_FLAGS)
#define vio_iu(IUE) ((union viosrp_iu *)((IUE)->sbuf->buf))
#define READ_CMD(cdb) (((cdb)[0] & 0x1F) == 8)
#define WRITE_CMD(cdb) (((cdb)[0] & 0x1F) == 0xA)
#ifndef H_GET_PARTNER_INFO
#define H_GET_PARTNER_INFO 0x0000000000000008LL
#endif
#ifndef H_ENABLE_PREPARE_FOR_SUSPEND
#define H_ENABLE_PREPARE_FOR_SUSPEND 0x000000000000001DLL
#endif
#ifndef H_READY_FOR_SUSPEND
#define H_READY_FOR_SUSPEND 0x000000000000001ELL
#endif
#define h_copy_rdma(l, sa, sb, da, db) \
plpar_hcall_norets(H_COPY_RDMA, l, sa, sb, da, db)
#define h_vioctl(u, o, a, u1, u2, u3, u4) \
plpar_hcall_norets(H_VIOCTL, u, o, a, u1, u2)
#define h_reg_crq(ua, tok, sz) \
plpar_hcall_norets(H_REG_CRQ, ua, tok, sz)
#define h_free_crq(ua) \
plpar_hcall_norets(H_FREE_CRQ, ua)
#define h_send_crq(ua, d1, d2) \
plpar_hcall_norets(H_SEND_CRQ, ua, d1, d2)
#endif
linux-7.2.3/drivers/scsi/ibmvscsi_tgt/libsrp.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*******************************************************************************
* SCSI RDMA Protocol lib functions
*
* Copyright (C) 2006 FUJITA Tomonori <tomof@acm.org>
* Copyright (C) 2016 Bryant G. Ly <bryantly@linux.vnet.ibm.com> IBM Corp.
*
***********************************************************************/
#define pr_fmt(fmt) "libsrp: " fmt
#include <linux/printk.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/kfifo.h>
#include <linux/scatterlist.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <scsi/srp.h>
#include <target/target_core_base.h>
#include "libsrp.h"
#include "ibmvscsi_tgt.h"
static int srp_iu_pool_alloc(struct srp_queue *q, size_t max,
struct srp_buf **ring)
{
struct iu_entry *iue;
int i;
q->pool = kzalloc_objs(struct iu_entry *, max);
if (!q->pool)
return -ENOMEM;
q->items = kzalloc_objs(struct iu_entry, max);
if (!q->items)
goto free_pool;
spin_lock_init(&q->lock);
kfifo_init(&q->queue, (void *)q->pool, max * sizeof(void *));
for (i = 0, iue = q->items; i < max; i++) {
kfifo_in(&q->queue, (void *)&iue, sizeof(void *));
iue->sbuf = ring[i];
iue++;
}
return 0;
free_pool:
kfree(q->pool);
return -ENOMEM;
}
static void srp_iu_pool_free(struct srp_queue *q)
{
kfree(q->items);
kfree(q->pool);
}
static struct srp_buf **srp_ring_alloc(struct device *dev,
size_t max, size_t size)
{
struct srp_buf **ring;
int i;
ring = kzalloc_objs(struct srp_buf *, max);
if (!ring)
return NULL;
for (i = 0; i < max; i++) {
ring[i] = kzalloc_obj(*ring[i]);
if (!ring[i])
goto out;
ring[i]->buf = dma_alloc_coherent(dev, size, &ring[i]->dma,
GFP_KERNEL);
if (!ring[i]->buf)
goto out;
}
return ring;
out:
for (i = 0; i < max && ring[i]; i++) {
if (ring[i]->buf) {
dma_free_coherent(dev, size, ring[i]->buf,
ring[i]->dma);
}
kfree(ring[i]);
}
kfree(ring);
return NULL;
}
static void srp_ring_free(struct device *dev, struct srp_buf **ring,
size_t max, size_t size)
{
int i;
for (i = 0; i < max; i++) {
dma_free_coherent(dev, size, ring[i]->buf, ring[i]->dma);
kfree(ring[i]);
}
kfree(ring);
}
int srp_target_alloc(struct srp_target *target, struct device *dev,
size_t nr, size_t iu_size)
{
int err;
spin_lock_init(&target->lock);
target->dev = dev;
target->srp_iu_size = iu_size;
target->rx_ring_size = nr;
target->rx_ring = srp_ring_alloc(target->dev, nr, iu_size);
if (!target->rx_ring)
return -ENOMEM;
err = srp_iu_pool_alloc(&target->iu_queue, nr, target->rx_ring);
if (err)
goto free_ring;
dev_set_drvdata(target->dev, target);
return 0;
free_ring:
srp_ring_free(target->dev, target->rx_ring, nr, iu_size);
return -ENOMEM;
}
void srp_target_free(struct srp_target *target)
{
dev_set_drvdata(target->dev, NULL);
srp_ring_free(target->dev, target->rx_ring, target->rx_ring_size,
target->srp_iu_size);
srp_iu_pool_free(&target->iu_queue);
}
struct iu_entry *srp_iu_get(struct srp_target *target)
{
struct iu_entry *iue = NULL;
if (kfifo_out_locked(&target->iu_queue.queue, (void *)&iue,
sizeof(void *),
&target->iu_queue.lock) != sizeof(void *)) {
WARN_ONCE(1, "unexpected fifo state");
return NULL;
}
if (!iue)
return iue;
iue->target = target;
iue->flags = 0;
return iue;
}
void srp_iu_put(struct iu_entry *iue)
{
kfifo_in_locked(&iue->target->iu_queue.queue, (void *)&iue,
sizeof(void *), &iue->target->iu_queue.lock);
}
static int srp_direct_data(struct ibmvscsis_cmd *cmd, struct srp_direct_buf *md,
enum dma_data_direction dir, srp_rdma_t rdma_io,
int dma_map, int ext_desc)
{
struct iu_entry *iue = NULL;
struct scatterlist *sg = NULL;
int err, nsg = 0, len;
if (dma_map) {
iue = cmd->iue;
sg = cmd->se_cmd.t_data_sg;
nsg = dma_map_sg(iue->target->dev, sg, cmd->se_cmd.t_data_nents,
DMA_BIDIRECTIONAL);
if (!nsg) {
pr_err("fail to map %p %d\n", iue,
cmd->se_cmd.t_data_nents);
return 0;
}
len = min(cmd->se_cmd.data_length, be32_to_cpu(md->len));
} else {
len = be32_to_cpu(md->len);
}
err = rdma_io(cmd, sg, nsg, md, 1, dir, len);
if (dma_map)
dma_unmap_sg(iue->target->dev, sg, cmd->se_cmd.t_data_nents,
DMA_BIDIRECTIONAL);
return err;
}
static int srp_indirect_data(struct ibmvscsis_cmd *cmd, struct srp_cmd *srp_cmd,
struct srp_indirect_buf *id,
enum dma_data_direction dir, srp_rdma_t rdma_io,
int dma_map, int ext_desc)
{
struct iu_entry *iue = NULL;
struct srp_direct_buf *md = NULL;
struct scatterlist dummy, *sg = NULL;
dma_addr_t token = 0;
int err = 0;
int nmd, nsg = 0, len;
if (dma_map || ext_desc) {
iue = cmd->iue;
sg = cmd->se_cmd.t_data_sg;
}
nmd = be32_to_cpu(id->table_desc.len) / sizeof(struct srp_direct_buf);
if ((dir == DMA_FROM_DEVICE && nmd == srp_cmd->data_in_desc_cnt) ||
(dir == DMA_TO_DEVICE && nmd == srp_cmd->data_out_desc_cnt)) {
md = &id->desc_list[0];
goto rdma;
}
if (ext_desc && dma_map) {
md = dma_alloc_coherent(iue->target->dev,
be32_to_cpu(id->table_desc.len),
&token, GFP_KERNEL);
if (!md) {
pr_err("Can't get dma memory %u\n",
be32_to_cpu(id->table_desc.len));
return -ENOMEM;
}
sg_init_one(&dummy, md, be32_to_cpu(id->table_desc.len));
sg_dma_address(&dummy) = token;
sg_dma_len(&dummy) = be32_to_cpu(id->table_desc.len);
err = rdma_io(cmd, &dummy, 1, &id->table_desc, 1, DMA_TO_DEVICE,
be32_to_cpu(id->table_desc.len));
if (err) {
pr_err("Error copying indirect table %d\n", err);
goto free_mem;
}
} else {
pr_err("This command uses external indirect buffer\n");
return -EINVAL;
}
rdma:
if (dma_map) {
nsg = dma_map_sg(iue->target->dev, sg, cmd->se_cmd.t_data_nents,
DMA_BIDIRECTIONAL);
if (!nsg) {
pr_err("fail to map %p %d\n", iue,
cmd->se_cmd.t_data_nents);
err = -EIO;
goto free_mem;
}
len = min(cmd->se_cmd.data_length, be32_to_cpu(id->len));
} else {
len = be32_to_cpu(id->len);
}
err = rdma_io(cmd, sg, nsg, md, nmd, dir, len);
if (dma_map)
dma_unmap_sg(iue->target->dev, sg, cmd->se_cmd.t_data_nents,
DMA_BIDIRECTIONAL);
free_mem:
if (token && dma_map) {
dma_free_coherent(iue->target->dev,
be32_to_cpu(id->table_desc.len), md, token);
}
return err;
}
static int data_out_desc_size(struct srp_cmd *cmd)
{
int size = 0;
u8 fmt = cmd->buf_fmt >> 4;
switch (fmt) {
case SRP_NO_DATA_DESC:
break;
case SRP_DATA_DESC_DIRECT:
size = sizeof(struct srp_direct_buf);
break;
case SRP_DATA_DESC_INDIRECT:
size = sizeof(struct srp_indirect_buf) +
sizeof(struct srp_direct_buf) * cmd->data_out_desc_cnt;
break;
default:
pr_err("client error. Invalid data_out_format %x\n", fmt);
break;
}
return size;
}
/*
* TODO: this can be called multiple times for a single command if it
* has very long data.
*/
int srp_transfer_data(struct ibmvscsis_cmd *cmd, struct srp_cmd *srp_cmd,
srp_rdma_t rdma_io, int dma_map, int ext_desc)
{
struct srp_direct_buf *md;
struct srp_indirect_buf *id;
enum dma_data_direction dir;
int offset, err = 0;
u8 format;
if (!cmd->se_cmd.t_data_nents)
return 0;
offset = srp_cmd->add_cdb_len & ~3;
dir = srp_cmd_direction(srp_cmd);
if (dir == DMA_FROM_DEVICE)
offset += data_out_desc_size(srp_cmd);
if (dir == DMA_TO_DEVICE)
format = srp_cmd->buf_fmt >> 4;
else
format = srp_cmd->buf_fmt & ((1U << 4) - 1);
switch (format) {
case SRP_NO_DATA_DESC:
break;
case SRP_DATA_DESC_DIRECT:
md = (struct srp_direct_buf *)(srp_cmd->add_data + offset);
err = srp_direct_data(cmd, md, dir, rdma_io, dma_map, ext_desc);
break;
case SRP_DATA_DESC_INDIRECT:
id = (struct srp_indirect_buf *)(srp_cmd->add_data + offset);
err = srp_indirect_data(cmd, srp_cmd, id, dir, rdma_io, dma_map,
ext_desc);
break;
default:
pr_err("Unknown format %d %x\n", dir, format);
err = -EINVAL;
}
return err;
}
u64 srp_data_length(struct srp_cmd *cmd, enum dma_data_direction dir)
{
struct srp_direct_buf *md;
struct srp_indirect_buf *id;
u64 len = 0;
uint offset = cmd->add_cdb_len & ~3;
u8 fmt;
if (dir == DMA_TO_DEVICE) {
fmt = cmd->buf_fmt >> 4;
} else {
fmt = cmd->buf_fmt & ((1U << 4) - 1);
offset += data_out_desc_size(cmd);
}
switch (fmt) {
case SRP_NO_DATA_DESC:
break;
case SRP_DATA_DESC_DIRECT:
md = (struct srp_direct_buf *)(cmd->add_data + offset);
len = be32_to_cpu(md->len);
break;
case SRP_DATA_DESC_INDIRECT:
id = (struct srp_indirect_buf *)(cmd->add_data + offset);
len = be32_to_cpu(id->len);
break;
default:
pr_err("invalid data format %x\n", fmt);
break;
}
return len;
}
int srp_get_desc_table(struct srp_cmd *srp_cmd, enum dma_data_direction *dir,
u64 *data_len)
{
struct srp_indirect_buf *idb;
struct srp_direct_buf *db;
uint add_cdb_offset;
int rc;
/*
* The pointer computations below will only be compiled correctly
* if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check
* whether srp_cmd::add_data has been declared as a byte pointer.
*/
BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0)
&& !__same_type(srp_cmd->add_data[0], (u8)0));
BUG_ON(!dir);
BUG_ON(!data_len);
rc = 0;
*data_len = 0;
*dir = DMA_NONE;
if (srp_cmd->buf_fmt & 0xf)
*dir = DMA_FROM_DEVICE;
else if (srp_cmd->buf_fmt >> 4)
*dir = DMA_TO_DEVICE;
add_cdb_offset = srp_cmd->add_cdb_len & ~3;
if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) ||
((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) {
db = (struct srp_direct_buf *)(srp_cmd->add_data
+ add_cdb_offset);
*data_len = be32_to_cpu(db->len);
} else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) ||
((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) {
idb = (struct srp_indirect_buf *)(srp_cmd->add_data
+ add_cdb_offset);
*data_len = be32_to_cpu(idb->len);
}
return rc;
}
MODULE_DESCRIPTION("SCSI RDMA Protocol lib functions");
MODULE_AUTHOR("FUJITA Tomonori");
MODULE_LICENSE("GPL");
linux-7.2.3/drivers/scsi/ibmvscsi_tgt/libsrp.h
+127
View File
@@ -0,0 +1,127 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LIBSRP_H__
#define __LIBSRP_H__
#include <linux/list.h>
#include <linux/kfifo.h>
#include <scsi/srp.h>
enum srp_valid {
INVALIDATE_CMD_RESP_EL = 0,
VALID_CMD_RESP_EL = 0x80,
VALID_INIT_MSG = 0xC0,
VALID_TRANS_EVENT = 0xFF
};
enum srp_format {
SRP_FORMAT = 1,
MAD_FORMAT = 2,
OS400_FORMAT = 3,
AIX_FORMAT = 4,
LINUX_FORMAT = 5,
MESSAGE_IN_CRQ = 6
};
enum srp_init_msg {
INIT_MSG = 1,
INIT_COMPLETE_MSG = 2
};
enum srp_trans_event {
UNUSED_FORMAT = 0,
PARTNER_FAILED = 1,
PARTNER_DEREGISTER = 2,
MIGRATED = 6,
PREPARE_FOR_SUSPEND = 9,
RESUME_FROM_SUSP = 0xA
};
enum srp_status {
CRQ_ENTRY_OVERWRITTEN = 0x20,
HEADER_DESCRIPTOR = 0xF1,
PING = 0xF5,
PING_RESPONSE = 0xF6
};
enum srp_mad_version {
MAD_VERSION_1 = 1
};
enum srp_os_type {
OS400 = 1,
LINUX = 2,
AIX = 3,
OFW = 4
};
enum srp_task_attributes {
SRP_SIMPLE_TASK = 0,
SRP_HEAD_TASK = 1,
SRP_ORDERED_TASK = 2,
SRP_ACA_TASK = 4
};
enum {
SRP_TASK_MANAGEMENT_FUNCTION_COMPLETE = 0,
SRP_REQUEST_FIELDS_INVALID = 2,
SRP_TASK_MANAGEMENT_FUNCTION_NOT_SUPPORTED = 4,
SRP_TASK_MANAGEMENT_FUNCTION_FAILED = 5
};
struct srp_buf {
dma_addr_t dma;
void *buf;
};
struct srp_queue {
void *pool;
void *items;
struct kfifo queue;
spinlock_t lock;
};
struct srp_target {
struct device *dev;
spinlock_t lock;
struct list_head cmd_queue;
size_t srp_iu_size;
struct srp_queue iu_queue;
size_t rx_ring_size;
struct srp_buf **rx_ring;
void *ldata;
};
struct iu_entry {
struct srp_target *target;
struct list_head ilist;
dma_addr_t remote_token;
unsigned long flags;
struct srp_buf *sbuf;
u16 iu_len;
};
struct ibmvscsis_cmd;
typedef int (srp_rdma_t)(struct ibmvscsis_cmd *, struct scatterlist *, int,
struct srp_direct_buf *, int,
enum dma_data_direction, unsigned int);
int srp_target_alloc(struct srp_target *, struct device *, size_t, size_t);
void srp_target_free(struct srp_target *);
struct iu_entry *srp_iu_get(struct srp_target *);
void srp_iu_put(struct iu_entry *);
int srp_transfer_data(struct ibmvscsis_cmd *, struct srp_cmd *,
srp_rdma_t, int, int);
u64 srp_data_length(struct srp_cmd *cmd, enum dma_data_direction dir);
int srp_get_desc_table(struct srp_cmd *srp_cmd, enum dma_data_direction *dir,
u64 *data_len);
static inline int srp_cmd_direction(struct srp_cmd *cmd)
{
return (cmd->buf_fmt >> 4) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
}
#endif