IB: Add SCSI RDMA Protocol (SRP) initiator

Add an InfiniBand SCSI RDMA Protocol (SRP) initiator.  This driver is
used to talk talk to InfiniBand SRP targets (storage devices).

Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 150 insertions, 0 deletions

diff --git a/drivers/infiniband/ulp/srp/ib_srp.h b/drivers/infiniband/ulp/srp/ib_srp.h
new file mode 100644
index 00000000000..4fec28a7136
--- /dev/null
+++ b/drivers/infiniband/ulp/srp/ib_srp.h
@@ -0,0 +1,150 @@
+/*
+ * Copyright (c) 2005 Cisco Systems.  All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * $Id: ib_srp.h 3932 2005-11-01 17:19:29Z roland $
+ */
+
+#ifndef IB_SRP_H
+#define IB_SRP_H
+
+#include <linux/types.h>
+#include <linux/list.h>
+
+#include <asm/semaphore.h>
+
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_cmnd.h>
+
+#include <rdma/ib_verbs.h>
+#include <rdma/ib_sa.h>
+#include <rdma/ib_cm.h>
+
+enum {
+	SRP_PATH_REC_TIMEOUT_MS	= 1000,
+	SRP_ABORT_TIMEOUT_MS	= 5000,
+
+	SRP_PORT_REDIRECT	= 1,
+	SRP_DLID_REDIRECT	= 2,
+
+	SRP_MAX_IU_LEN		= 256,
+
+	SRP_RQ_SHIFT    	= 6,
+	SRP_RQ_SIZE		= 1 << SRP_RQ_SHIFT,
+	SRP_SQ_SIZE		= SRP_RQ_SIZE - 1,
+	SRP_CQ_SIZE		= SRP_SQ_SIZE + SRP_RQ_SIZE,
+
+	SRP_TAG_TSK_MGMT	= 1 << (SRP_RQ_SHIFT + 1)
+};
+
+#define SRP_OP_RECV		(1 << 31)
+#define SRP_MAX_INDIRECT	((SRP_MAX_IU_LEN -			\
+				  sizeof (struct srp_cmd) -		\
+				  sizeof (struct srp_indirect_buf)) / 16)
+
+enum srp_target_state {
+	SRP_TARGET_LIVE,
+	SRP_TARGET_CONNECTING,
+	SRP_TARGET_DEAD,
+	SRP_TARGET_REMOVED
+};
+
+struct srp_host {
+	u8			initiator_port_id[16];
+	struct ib_device       *dev;
+	u8                      port;
+	struct ib_pd	       *pd;
+	struct ib_mr	       *mr;
+	struct class_device	class_dev;
+	struct list_head	target_list;
+	struct semaphore        target_mutex;
+	struct completion	released;
+	struct list_head	list;
+};
+
+struct srp_request {
+	struct list_head	list;
+	struct scsi_cmnd       *scmnd;
+	struct srp_iu	       *cmd;
+	struct srp_iu	       *tsk_mgmt;
+	DECLARE_PCI_UNMAP_ADDR(direct_mapping)
+	struct completion	done;
+	short			next;
+	u8			cmd_done;
+	u8			tsk_status;
+};
+
+struct srp_target_port {
+	__be64			id_ext;
+	__be64			ioc_guid;
+	__be64			service_id;
+	struct srp_host	       *srp_host;
+	struct Scsi_Host       *scsi_host;
+	char			target_name[32];
+	unsigned int		scsi_id;
+
+	struct ib_sa_path_rec	path;
+	struct ib_sa_query     *path_query;
+	int			path_query_id;
+
+	struct ib_cm_id	       *cm_id;
+	struct ib_cq	       *cq;
+	struct ib_qp	       *qp;
+
+	int			max_ti_iu_len;
+	s32			req_lim;
+
+	unsigned		rx_head;
+	struct srp_iu	       *rx_ring[SRP_RQ_SIZE];
+
+	unsigned		tx_head;
+	unsigned		tx_tail;
+	struct srp_iu	       *tx_ring[SRP_SQ_SIZE + 1];
+
+	int			req_head;
+	struct list_head	req_queue;
+	struct srp_request	req_ring[SRP_SQ_SIZE];
+
+	struct work_struct	work;
+
+	struct list_head	list;
+	struct completion	done;
+	int			status;
+	enum srp_target_state	state;
+};
+
+struct srp_iu {
+	dma_addr_t		dma;
+	void		       *buf;
+	size_t			size;
+	enum dma_data_direction	direction;
+};
+
+#endif /* IB_SRP_H */