#define ISER_KMALLOC_THRESHOLD 0x20000 /* 128K - kmalloc limit */
+struct fast_reg_descriptor *
+iser_reg_desc_get(struct ib_conn *ib_conn)
+{
+ struct fast_reg_descriptor *desc;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ib_conn->lock, flags);
+ desc = list_first_entry(&ib_conn->fastreg.pool,
+ struct fast_reg_descriptor, list);
+ list_del(&desc->list);
+ spin_unlock_irqrestore(&ib_conn->lock, flags);
+
+ return desc;
+}
+
+void
+iser_reg_desc_put(struct ib_conn *ib_conn,
+ struct fast_reg_descriptor *desc)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&ib_conn->lock, flags);
+ list_add_tail(&desc->list, &ib_conn->fastreg.pool);
+ spin_unlock_irqrestore(&ib_conn->lock, flags);
+}
+
/**
* iser_start_rdma_unaligned_sg
*/
enum iser_data_dir cmd_dir)
{
struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
- struct iser_conn *iser_conn = iser_task->iser_conn;
- struct ib_conn *ib_conn = &iser_conn->ib_conn;
- struct fast_reg_descriptor *desc = reg->mem_h;
- if (!desc)
+ if (!reg->mem_h)
return;
+ iser_reg_desc_put(&iser_task->iser_conn->ib_conn,
+ reg->mem_h);
reg->mem_h = NULL;
- spin_lock_bh(&ib_conn->lock);
- list_add_tail(&desc->list, &ib_conn->fastreg.pool);
- spin_unlock_bh(&ib_conn->lock);
}
/**
struct fast_reg_descriptor *desc = NULL;
struct ib_sge data_sge;
int err, aligned_len;
- unsigned long flags;
aligned_len = iser_data_buf_aligned_len(mem, ibdev);
if (aligned_len != mem->dma_nents) {
if (mem->dma_nents != 1 ||
scsi_get_prot_op(iser_task->sc) != SCSI_PROT_NORMAL) {
- spin_lock_irqsave(&ib_conn->lock, flags);
- desc = list_first_entry(&ib_conn->fastreg.pool,
- struct fast_reg_descriptor, list);
- list_del(&desc->list);
- spin_unlock_irqrestore(&ib_conn->lock, flags);
+ desc = iser_reg_desc_get(ib_conn);
mem_reg->mem_h = desc;
}
return 0;
err_reg:
- if (desc) {
- spin_lock_irqsave(&ib_conn->lock, flags);
- list_add_tail(&desc->list, &ib_conn->fastreg.pool);
- spin_unlock_irqrestore(&ib_conn->lock, flags);
- }
+ if (desc)
+ iser_reg_desc_put(ib_conn, desc);
return err;
}