[SCSI] scsi tgt: SCSI RDMA Protocol library functions
libsrp provides helper functions for SRP target drivers. Some SRP target drivers would be out of drivers/scsi/ so we added an entry for libsrp in drivers/scsi/Kconfig. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: Santiago Leon <santil@us.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
FUJITA Tomonori
James Bottomley
Родитель
c603d04ef6
Коммит
26b1482344
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@ -1760,6 +1760,16 @@ config ZFCP
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called zfcp. If you want to compile it as a module, say M here
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and read <file:Documentation/modules.txt>.
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config SCSI_SRP
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tristate "SCSI RDMA Protocol helper library"
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depends on SCSI && PCI
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select SCSI_TGT
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help
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If you wish to use SRP target drivers, say Y.
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To compile this driver as a module, choose M here: the
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module will be called libsrp.
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endmenu
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source "drivers/scsi/pcmcia/Kconfig"
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@ -126,6 +126,7 @@ obj-$(CONFIG_SCSI_FCAL) += fcal.o
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obj-$(CONFIG_SCSI_LASI700) += 53c700.o lasi700.o
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obj-$(CONFIG_SCSI_NSP32) += nsp32.o
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obj-$(CONFIG_SCSI_IPR) += ipr.o
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obj-$(CONFIG_SCSI_SRP) += libsrp.o
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obj-$(CONFIG_SCSI_IBMVSCSI) += ibmvscsi/
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obj-$(CONFIG_SCSI_HPTIOP) += hptiop.o
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obj-$(CONFIG_SCSI_STEX) += stex.o
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@ -0,0 +1,441 @@
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/*
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* SCSI RDAM Protocol lib functions
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*
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* Copyright (C) 2006 FUJITA Tomonori <tomof@acm.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include <linux/err.h>
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#include <linux/kfifo.h>
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#include <linux/scatterlist.h>
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#include <linux/dma-mapping.h>
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#include <linux/pci.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_tcq.h>
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#include <scsi/scsi_tgt.h>
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#include <scsi/srp.h>
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#include <scsi/libsrp.h>
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enum srp_task_attributes {
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SRP_SIMPLE_TASK = 0,
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SRP_HEAD_TASK = 1,
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SRP_ORDERED_TASK = 2,
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SRP_ACA_TASK = 4
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};
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/* tmp - will replace with SCSI logging stuff */
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#define eprintk(fmt, args...) \
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do { \
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printk("%s(%d) " fmt, __FUNCTION__, __LINE__, ##args); \
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} while (0)
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/* #define dprintk eprintk */
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#define dprintk(fmt, args...)
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static int srp_iu_pool_alloc(struct srp_queue *q, size_t max,
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struct srp_buf **ring)
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{
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int i;
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struct iu_entry *iue;
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q->pool = kcalloc(max, sizeof(struct iu_entry *), GFP_KERNEL);
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if (!q->pool)
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return -ENOMEM;
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q->items = kcalloc(max, sizeof(struct iu_entry), GFP_KERNEL);
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if (!q->items)
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goto free_pool;
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spin_lock_init(&q->lock);
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q->queue = kfifo_init((void *) q->pool, max * sizeof(void *),
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GFP_KERNEL, &q->lock);
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if (IS_ERR(q->queue))
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goto free_item;
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for (i = 0, iue = q->items; i < max; i++) {
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__kfifo_put(q->queue, (void *) &iue, sizeof(void *));
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iue->sbuf = ring[i];
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iue++;
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}
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return 0;
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free_item:
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kfree(q->items);
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free_pool:
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kfree(q->pool);
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return -ENOMEM;
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}
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static void srp_iu_pool_free(struct srp_queue *q)
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{
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kfree(q->items);
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kfree(q->pool);
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}
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static struct srp_buf **srp_ring_alloc(struct device *dev,
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size_t max, size_t size)
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{
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int i;
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struct srp_buf **ring;
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ring = kcalloc(max, sizeof(struct srp_buf *), GFP_KERNEL);
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if (!ring)
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return NULL;
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for (i = 0; i < max; i++) {
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ring[i] = kzalloc(sizeof(struct srp_buf), GFP_KERNEL);
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if (!ring[i])
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goto out;
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ring[i]->buf = dma_alloc_coherent(dev, size, &ring[i]->dma,
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GFP_KERNEL);
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if (!ring[i]->buf)
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goto out;
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}
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return ring;
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out:
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for (i = 0; i < max && ring[i]; i++) {
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if (ring[i]->buf)
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dma_free_coherent(dev, size, ring[i]->buf, ring[i]->dma);
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kfree(ring[i]);
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}
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kfree(ring);
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return NULL;
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}
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static void srp_ring_free(struct device *dev, struct srp_buf **ring, size_t max,
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size_t size)
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{
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int i;
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for (i = 0; i < max; i++) {
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dma_free_coherent(dev, size, ring[i]->buf, ring[i]->dma);
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kfree(ring[i]);
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}
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}
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int srp_target_alloc(struct srp_target *target, struct device *dev,
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size_t nr, size_t iu_size)
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{
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int err;
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spin_lock_init(&target->lock);
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INIT_LIST_HEAD(&target->cmd_queue);
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target->dev = dev;
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target->dev->driver_data = target;
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target->srp_iu_size = iu_size;
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target->rx_ring_size = nr;
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target->rx_ring = srp_ring_alloc(target->dev, nr, iu_size);
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if (!target->rx_ring)
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return -ENOMEM;
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err = srp_iu_pool_alloc(&target->iu_queue, nr, target->rx_ring);
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if (err)
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goto free_ring;
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return 0;
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free_ring:
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srp_ring_free(target->dev, target->rx_ring, nr, iu_size);
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return -ENOMEM;
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}
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EXPORT_SYMBOL_GPL(srp_target_alloc);
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void srp_target_free(struct srp_target *target)
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{
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srp_ring_free(target->dev, target->rx_ring, target->rx_ring_size,
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target->srp_iu_size);
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srp_iu_pool_free(&target->iu_queue);
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}
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EXPORT_SYMBOL_GPL(srp_target_free);
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struct iu_entry *srp_iu_get(struct srp_target *target)
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{
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struct iu_entry *iue = NULL;
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kfifo_get(target->iu_queue.queue, (void *) &iue, sizeof(void *));
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if (!iue)
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return iue;
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iue->target = target;
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INIT_LIST_HEAD(&iue->ilist);
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iue->flags = 0;
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return iue;
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}
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EXPORT_SYMBOL_GPL(srp_iu_get);
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void srp_iu_put(struct iu_entry *iue)
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{
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kfifo_put(iue->target->iu_queue.queue, (void *) &iue, sizeof(void *));
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}
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EXPORT_SYMBOL_GPL(srp_iu_put);
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static int srp_direct_data(struct scsi_cmnd *sc, struct srp_direct_buf *md,
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enum dma_data_direction dir, srp_rdma_t rdma_io,
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int dma_map, int ext_desc)
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{
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struct iu_entry *iue = NULL;
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struct scatterlist *sg = NULL;
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int err, nsg = 0, len;
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if (dma_map) {
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iue = (struct iu_entry *) sc->SCp.ptr;
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sg = sc->request_buffer;
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dprintk("%p %u %u %d\n", iue, sc->request_bufflen,
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md->len, sc->use_sg);
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nsg = dma_map_sg(iue->target->dev, sg, sc->use_sg,
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DMA_BIDIRECTIONAL);
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if (!nsg) {
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printk("fail to map %p %d\n", iue, sc->use_sg);
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return 0;
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}
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len = min(sc->request_bufflen, md->len);
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} else
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len = md->len;
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err = rdma_io(sc, sg, nsg, md, 1, dir, len);
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if (dma_map)
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dma_unmap_sg(iue->target->dev, sg, nsg, DMA_BIDIRECTIONAL);
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return err;
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}
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static int srp_indirect_data(struct scsi_cmnd *sc, struct srp_cmd *cmd,
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struct srp_indirect_buf *id,
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enum dma_data_direction dir, srp_rdma_t rdma_io,
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int dma_map, int ext_desc)
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{
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struct iu_entry *iue = NULL;
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struct srp_direct_buf *md = NULL;
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struct scatterlist dummy, *sg = NULL;
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dma_addr_t token = 0;
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long err;
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unsigned int done = 0;
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int nmd, nsg = 0, len;
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if (dma_map || ext_desc) {
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iue = (struct iu_entry *) sc->SCp.ptr;
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sg = sc->request_buffer;
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dprintk("%p %u %u %d %d\n",
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iue, sc->request_bufflen, id->len,
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cmd->data_in_desc_cnt, cmd->data_out_desc_cnt);
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}
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nmd = id->table_desc.len / sizeof(struct srp_direct_buf);
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if ((dir == DMA_FROM_DEVICE && nmd == cmd->data_in_desc_cnt) ||
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(dir == DMA_TO_DEVICE && nmd == cmd->data_out_desc_cnt)) {
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md = &id->desc_list[0];
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goto rdma;
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}
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if (ext_desc && dma_map) {
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md = dma_alloc_coherent(iue->target->dev, id->table_desc.len,
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&token, GFP_KERNEL);
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if (!md) {
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eprintk("Can't get dma memory %u\n", id->table_desc.len);
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return -ENOMEM;
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}
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sg_init_one(&dummy, md, id->table_desc.len);
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sg_dma_address(&dummy) = token;
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err = rdma_io(sc, &dummy, 1, &id->table_desc, 1, DMA_TO_DEVICE,
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id->table_desc.len);
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if (err < 0) {
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eprintk("Error copying indirect table %ld\n", err);
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goto free_mem;
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}
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} else {
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eprintk("This command uses external indirect buffer\n");
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return -EINVAL;
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}
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rdma:
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if (dma_map) {
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nsg = dma_map_sg(iue->target->dev, sg, sc->use_sg, DMA_BIDIRECTIONAL);
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if (!nsg) {
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eprintk("fail to map %p %d\n", iue, sc->use_sg);
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goto free_mem;
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}
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len = min(sc->request_bufflen, id->len);
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} else
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len = id->len;
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err = rdma_io(sc, sg, nsg, md, nmd, dir, len);
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if (dma_map)
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dma_unmap_sg(iue->target->dev, sg, nsg, DMA_BIDIRECTIONAL);
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free_mem:
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if (token && dma_map)
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dma_free_coherent(iue->target->dev, id->table_desc.len, md, token);
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return done;
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}
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static int data_out_desc_size(struct srp_cmd *cmd)
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{
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int size = 0;
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u8 fmt = cmd->buf_fmt >> 4;
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switch (fmt) {
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case SRP_NO_DATA_DESC:
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break;
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case SRP_DATA_DESC_DIRECT:
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size = sizeof(struct srp_direct_buf);
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break;
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case SRP_DATA_DESC_INDIRECT:
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size = sizeof(struct srp_indirect_buf) +
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sizeof(struct srp_direct_buf) * cmd->data_out_desc_cnt;
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break;
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default:
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eprintk("client error. Invalid data_out_format %x\n", fmt);
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break;
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}
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return size;
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}
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/*
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* TODO: this can be called multiple times for a single command if it
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* has very long data.
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*/
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int srp_transfer_data(struct scsi_cmnd *sc, struct srp_cmd *cmd,
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srp_rdma_t rdma_io, int dma_map, int ext_desc)
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{
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struct srp_direct_buf *md;
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struct srp_indirect_buf *id;
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enum dma_data_direction dir;
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int offset, err = 0;
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u8 format;
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offset = cmd->add_cdb_len * 4;
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dir = srp_cmd_direction(cmd);
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if (dir == DMA_FROM_DEVICE)
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offset += data_out_desc_size(cmd);
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if (dir == DMA_TO_DEVICE)
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format = cmd->buf_fmt >> 4;
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else
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format = cmd->buf_fmt & ((1U << 4) - 1);
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switch (format) {
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case SRP_NO_DATA_DESC:
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break;
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case SRP_DATA_DESC_DIRECT:
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md = (struct srp_direct_buf *)
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(cmd->add_data + offset);
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err = srp_direct_data(sc, md, dir, rdma_io, dma_map, ext_desc);
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break;
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case SRP_DATA_DESC_INDIRECT:
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id = (struct srp_indirect_buf *)
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(cmd->add_data + offset);
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err = srp_indirect_data(sc, cmd, id, dir, rdma_io, dma_map,
|
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ext_desc);
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break;
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default:
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eprintk("Unknown format %d %x\n", dir, format);
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break;
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}
|
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|
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return err;
|
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}
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EXPORT_SYMBOL_GPL(srp_transfer_data);
|
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|
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static int vscsis_data_length(struct srp_cmd *cmd, enum dma_data_direction dir)
|
||||
{
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struct srp_direct_buf *md;
|
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struct srp_indirect_buf *id;
|
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int len = 0, offset = cmd->add_cdb_len * 4;
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u8 fmt;
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|
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if (dir == DMA_TO_DEVICE)
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||||
fmt = cmd->buf_fmt >> 4;
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||||
else {
|
||||
fmt = cmd->buf_fmt & ((1U << 4) - 1);
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offset += data_out_desc_size(cmd);
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||||
}
|
||||
|
||||
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 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->request_bufflen = len;
|
||||
sc->request_buffer = (void *) (unsigned long) addr;
|
||||
sc->tag = tag;
|
||||
err = scsi_tgt_queue_command(sc, (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 RDAM Protocol lib functions");
|
||||
MODULE_AUTHOR("FUJITA Tomonori");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
|
@ -0,0 +1,77 @@
|
|||
#ifndef __LIBSRP_H__
|
||||
#define __LIBSRP_H__
|
||||
|
||||
#include <linux/list.h>
|
||||
#include <scsi/scsi_cmnd.h>
|
||||
#include <scsi/scsi_host.h>
|
||||
#include <scsi/srp.h>
|
||||
|
||||
enum iue_flags {
|
||||
V_DIOVER,
|
||||
V_WRITE,
|
||||
V_LINKED,
|
||||
V_FLYING,
|
||||
};
|
||||
|
||||
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 Scsi_Host *shost;
|
||||
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;
|
||||
};
|
||||
|
||||
typedef int (srp_rdma_t)(struct scsi_cmnd *, struct scatterlist *, int,
|
||||
struct srp_direct_buf *, int,
|
||||
enum dma_data_direction, unsigned int);
|
||||
extern int srp_target_alloc(struct srp_target *, struct device *, size_t, size_t);
|
||||
extern void srp_target_free(struct srp_target *);
|
||||
|
||||
extern struct iu_entry *srp_iu_get(struct srp_target *);
|
||||
extern void srp_iu_put(struct iu_entry *);
|
||||
|
||||
extern int srp_cmd_queue(struct Scsi_Host *, struct srp_cmd *, void *, u64);
|
||||
extern int srp_transfer_data(struct scsi_cmnd *, struct srp_cmd *,
|
||||
srp_rdma_t, int, int);
|
||||
|
||||
|
||||
static inline struct srp_target *host_to_srp_target(struct Scsi_Host *host)
|
||||
{
|
||||
return (struct srp_target *) host->hostdata;
|
||||
}
|
||||
|
||||
static inline int srp_cmd_direction(struct srp_cmd *cmd)
|
||||
{
|
||||
return (cmd->buf_fmt >> 4) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
|
||||
}
|
||||
|
||||
#endif
|
||||
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