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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ return NULL;
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+}
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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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+
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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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+
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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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+
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+ spin_lock_init(&target->lock);
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+ INIT_LIST_HEAD(&target->cmd_queue);
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+
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+ target->dev = dev;
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+ target->dev->driver_data = target;
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+
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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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+
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+ return 0;
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ err = rdma_io(sc, sg, nsg, md, 1, dir, len);
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+
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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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+
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+ return err;
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+}
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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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+
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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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+
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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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+
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+ nmd = id->table_desc.len / sizeof(struct srp_direct_buf);
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+
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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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+
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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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+
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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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+
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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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+
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+ err = rdma_io(sc, sg, nsg, md, nmd, dir, len);
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+
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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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+
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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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+
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+ return done;
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+}
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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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+
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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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+/*
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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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+
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+ offset = cmd->add_cdb_len * 4;
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+
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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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+
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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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+
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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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+{
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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 {
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+ fmt = cmd->buf_fmt & ((1U << 4) - 1);
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+ offset += data_out_desc_size(cmd);
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+ }
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+
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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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+ md = (struct srp_direct_buf *) (cmd->add_data + offset);
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+ len = md->len;
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+ break;
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+ case SRP_DATA_DESC_INDIRECT:
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+ id = (struct srp_indirect_buf *) (cmd->add_data + offset);
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+ len = id->len;
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+ break;
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+ default:
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+ eprintk("invalid data format %x\n", fmt);
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+ break;
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+ }
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+ return len;
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+}
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+
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+int srp_cmd_queue(struct Scsi_Host *shost, struct srp_cmd *cmd, void *info,
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+ u64 addr)
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+{
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+ enum dma_data_direction dir;
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+ struct scsi_cmnd *sc;
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+ int tag, len, err;
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+
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+ switch (cmd->task_attr) {
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+ case SRP_SIMPLE_TASK:
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|
|
+ 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");
|