+++ /dev/null
-/*
- * SCSI RDMA Protocol lib functions
- *
- * Copyright (C) 2006 FUJITA Tomonori <tomof@acm.org>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
- * 02110-1301 USA
- */
-#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/scsi.h>
-#include <scsi/scsi_cmnd.h>
-#include <scsi/scsi_tcq.h>
-#include <scsi/scsi_tgt.h>
-#include <scsi/srp.h>
-#include <scsi/libsrp.h>
-
-enum srp_task_attributes {
- SRP_SIMPLE_TASK = 0,
- SRP_HEAD_TASK = 1,
- SRP_ORDERED_TASK = 2,
- SRP_ACA_TASK = 4
-};
-
-/* tmp - will replace with SCSI logging stuff */
-#define eprintk(fmt, args...) \
-do { \
- printk("%s(%d) " fmt, __func__, __LINE__, ##args); \
-} while (0)
-/* #define dprintk eprintk */
-#define dprintk(fmt, args...)
-
-static int srp_iu_pool_alloc(struct srp_queue *q, size_t max,
- struct srp_buf **ring)
-{
- int i;
- struct iu_entry *iue;
-
- q->pool = kcalloc(max, sizeof(struct iu_entry *), GFP_KERNEL);
- if (!q->pool)
- return -ENOMEM;
- q->items = kcalloc(max, sizeof(struct iu_entry), GFP_KERNEL);
- 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;
-
- kfree(q->items);
-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)
-{
- int i;
- struct srp_buf **ring;
-
- ring = kcalloc(max, sizeof(struct srp_buf *), GFP_KERNEL);
- if (!ring)
- return NULL;
-
- for (i = 0; i < max; i++) {
- ring[i] = kzalloc(sizeof(struct srp_buf), GFP_KERNEL);
- 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);
- INIT_LIST_HEAD(&target->cmd_queue);
-
- target->dev = dev;
- dev_set_drvdata(target->dev, target);
-
- 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;
-
- return 0;
-
-free_ring:
- srp_ring_free(target->dev, target->rx_ring, nr, iu_size);
- return -ENOMEM;
-}
-EXPORT_SYMBOL_GPL(srp_target_alloc);
-
-void srp_target_free(struct srp_target *target)
-{
- srp_ring_free(target->dev, target->rx_ring, target->rx_ring_size,
- target->srp_iu_size);
- srp_iu_pool_free(&target->iu_queue);
-}
-EXPORT_SYMBOL_GPL(srp_target_free);
-
-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;
- INIT_LIST_HEAD(&iue->ilist);
- iue->flags = 0;
- return iue;
-}
-EXPORT_SYMBOL_GPL(srp_iu_get);
-
-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);
-}
-EXPORT_SYMBOL_GPL(srp_iu_put);
-
-static int srp_direct_data(struct scsi_cmnd *sc, 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 = (struct iu_entry *) sc->SCp.ptr;
- sg = scsi_sglist(sc);
-
- dprintk("%p %u %u %d\n", iue, scsi_bufflen(sc),
- md->len, scsi_sg_count(sc));
-
- nsg = dma_map_sg(iue->target->dev, sg, scsi_sg_count(sc),
- DMA_BIDIRECTIONAL);
- if (!nsg) {
- printk("fail to map %p %d\n", iue, scsi_sg_count(sc));
- return 0;
- }
- len = min(scsi_bufflen(sc), md->len);
- } else
- len = md->len;
-
- err = rdma_io(sc, sg, nsg, md, 1, dir, len);
-
- if (dma_map)
- dma_unmap_sg(iue->target->dev, sg, nsg, DMA_BIDIRECTIONAL);
-
- return err;
-}
-
-static int srp_indirect_data(struct scsi_cmnd *sc, struct srp_cmd *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 = (struct iu_entry *) sc->SCp.ptr;
- sg = scsi_sglist(sc);
-
- dprintk("%p %u %u %d %d\n",
- iue, scsi_bufflen(sc), id->len,
- cmd->data_in_desc_cnt, cmd->data_out_desc_cnt);
- }
-
- nmd = id->table_desc.len / sizeof(struct srp_direct_buf);
-
- if ((dir == DMA_FROM_DEVICE && nmd == cmd->data_in_desc_cnt) ||
- (dir == DMA_TO_DEVICE && nmd == cmd->data_out_desc_cnt)) {
- md = &id->desc_list[0];
- goto rdma;
- }
-
- if (ext_desc && dma_map) {
- md = dma_alloc_coherent(iue->target->dev, id->table_desc.len,
- &token, GFP_KERNEL);
- if (!md) {
- eprintk("Can't get dma memory %u\n", id->table_desc.len);
- return -ENOMEM;
- }
-
- sg_init_one(&dummy, md, id->table_desc.len);
- sg_dma_address(&dummy) = token;
- sg_dma_len(&dummy) = id->table_desc.len;
- err = rdma_io(sc, &dummy, 1, &id->table_desc, 1, DMA_TO_DEVICE,
- id->table_desc.len);
- if (err) {
- eprintk("Error copying indirect table %d\n", err);
- goto free_mem;
- }
- } else {
- eprintk("This command uses external indirect buffer\n");
- return -EINVAL;
- }
-
-rdma:
- if (dma_map) {
- nsg = dma_map_sg(iue->target->dev, sg, scsi_sg_count(sc),
- DMA_BIDIRECTIONAL);
- if (!nsg) {
- eprintk("fail to map %p %d\n", iue, scsi_sg_count(sc));
- err = -EIO;
- goto free_mem;
- }
- len = min(scsi_bufflen(sc), id->len);
- } else
- len = id->len;
-
- err = rdma_io(sc, sg, nsg, md, nmd, dir, len);
-
- if (dma_map)
- dma_unmap_sg(iue->target->dev, sg, nsg, DMA_BIDIRECTIONAL);
-
-free_mem:
- if (token && dma_map)
- dma_free_coherent(iue->target->dev, 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:
- eprintk("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 scsi_cmnd *sc, struct srp_cmd *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;
-
- offset = cmd->add_cdb_len & ~3;
-
- dir = srp_cmd_direction(cmd);
- if (dir == DMA_FROM_DEVICE)
- offset += data_out_desc_size(cmd);
-
- if (dir == DMA_TO_DEVICE)
- format = cmd->buf_fmt >> 4;
- else
- format = cmd->buf_fmt & ((1U << 4) - 1);
-
- switch (format) {
- case SRP_NO_DATA_DESC:
- break;
- case SRP_DATA_DESC_DIRECT:
- md = (struct srp_direct_buf *)
- (cmd->add_data + offset);
- err = srp_direct_data(sc, md, dir, rdma_io, dma_map, ext_desc);
- break;
- case SRP_DATA_DESC_INDIRECT:
- id = (struct srp_indirect_buf *)
- (cmd->add_data + offset);
- err = srp_indirect_data(sc, cmd, id, dir, rdma_io, dma_map,
- ext_desc);
- break;
- default:
- eprintk("Unknown format %d %x\n", dir, format);
- err = -EINVAL;
- }
-
- return err;
-}
-EXPORT_SYMBOL_GPL(srp_transfer_data);
-
-static int vscsis_data_length(struct srp_cmd *cmd, enum dma_data_direction dir)
-{
- struct srp_direct_buf *md;
- struct srp_indirect_buf *id;
- int len = 0, 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 = md->len;
- break;
- case SRP_DATA_DESC_INDIRECT:
- id = (struct srp_indirect_buf *) (cmd->add_data + offset);
- len = id->len;
- break;
- default:
- eprintk("invalid data format %x\n", fmt);
- break;
- }
- return len;
-}
-
-int srp_cmd_queue(struct Scsi_Host *shost, struct srp_cmd *cmd, void *info,
- u64 itn_id, u64 addr)
-{
- enum dma_data_direction dir;
- struct scsi_cmnd *sc;
- int tag, len, err;
-
- switch (cmd->task_attr) {
- case SRP_SIMPLE_TASK:
- tag = MSG_SIMPLE_TAG;
- break;
- case SRP_ORDERED_TASK:
- tag = MSG_ORDERED_TAG;
- break;
- case SRP_HEAD_TASK:
- tag = MSG_HEAD_TAG;
- break;
- default:
- eprintk("Task attribute %d not supported\n", cmd->task_attr);
- tag = MSG_ORDERED_TAG;
- }
-
- dir = srp_cmd_direction(cmd);
- len = vscsis_data_length(cmd, dir);
-
- dprintk("%p %x %lx %d %d %d %llx\n", info, cmd->cdb[0],
- cmd->lun, dir, len, tag, (unsigned long long) cmd->tag);
-
- sc = scsi_host_get_command(shost, dir, GFP_KERNEL);
- if (!sc)
- return -ENOMEM;
-
- sc->SCp.ptr = info;
- memcpy(sc->cmnd, cmd->cdb, MAX_COMMAND_SIZE);
- sc->sdb.length = len;
- sc->sdb.table.sgl = (void *) (unsigned long) addr;
- sc->tag = tag;
- err = scsi_tgt_queue_command(sc, itn_id, (struct scsi_lun *)&cmd->lun,
- cmd->tag);
- if (err)
- scsi_host_put_command(shost, sc);
-
- return err;
-}
-EXPORT_SYMBOL_GPL(srp_cmd_queue);
-
-MODULE_DESCRIPTION("SCSI RDMA Protocol lib functions");
-MODULE_AUTHOR("FUJITA Tomonori");
-MODULE_LICENSE("GPL");
projects / users / hch / xfs.git / commitdiff