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>
diff --git a/drivers/infiniband/ulp/srp/ib_srp.h b/drivers/infiniband/ulp/srp/ib_srp.h
new file mode 100644
index 0000000..4fec28a
--- /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 */