cf368713a3
Since the SCSI midlayer is moving towards entirely getting rid of
commands with use_sg == 0, we should treat this case as an exception.
Therefore, change the IB SRP initiator to create a fake scatterlist
for these commands with sg_init_one(). This simplifies the flow of
DMA mapping and unmapping, since SRP can just use dma_map_sg() and
dma_unmap_sg() unconditionally, rather than having to choose between
the dma_{map,unmap}_sg() and dma_{map,unmap}_single() variants.
Signed-off-by: Roland Dreier <rolandd@cisco.com>
156 lines
3.9 KiB
C
156 lines
3.9 KiB
C
/*
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* Copyright (c) 2005 Cisco Systems. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* $Id: ib_srp.h 3932 2005-11-01 17:19:29Z roland $
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*/
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#ifndef IB_SRP_H
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#define IB_SRP_H
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/scatterlist.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_cmnd.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/ib_sa.h>
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#include <rdma/ib_cm.h>
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enum {
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SRP_PATH_REC_TIMEOUT_MS = 1000,
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SRP_ABORT_TIMEOUT_MS = 5000,
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SRP_PORT_REDIRECT = 1,
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SRP_DLID_REDIRECT = 2,
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SRP_MAX_LUN = 512,
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SRP_MAX_IU_LEN = 256,
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SRP_RQ_SHIFT = 6,
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SRP_RQ_SIZE = 1 << SRP_RQ_SHIFT,
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SRP_SQ_SIZE = SRP_RQ_SIZE - 1,
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SRP_CQ_SIZE = SRP_SQ_SIZE + SRP_RQ_SIZE,
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SRP_TAG_TSK_MGMT = 1 << (SRP_RQ_SHIFT + 1)
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};
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#define SRP_OP_RECV (1 << 31)
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#define SRP_MAX_INDIRECT ((SRP_MAX_IU_LEN - \
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sizeof (struct srp_cmd) - \
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sizeof (struct srp_indirect_buf)) / 16)
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enum srp_target_state {
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SRP_TARGET_LIVE,
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SRP_TARGET_CONNECTING,
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SRP_TARGET_DEAD,
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SRP_TARGET_REMOVED
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};
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struct srp_host {
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u8 initiator_port_id[16];
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struct ib_device *dev;
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u8 port;
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struct ib_pd *pd;
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struct ib_mr *mr;
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struct class_device class_dev;
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struct list_head target_list;
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struct mutex target_mutex;
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struct completion released;
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struct list_head list;
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};
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struct srp_request {
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struct list_head list;
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struct scsi_cmnd *scmnd;
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struct srp_iu *cmd;
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struct srp_iu *tsk_mgmt;
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/*
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* Fake scatterlist used when scmnd->use_sg==0. Can be killed
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* when the SCSI midlayer no longer generates non-SG commands.
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*/
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struct scatterlist fake_sg;
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struct completion done;
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short next;
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u8 cmd_done;
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u8 tsk_status;
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};
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struct srp_target_port {
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__be64 id_ext;
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__be64 ioc_guid;
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__be64 service_id;
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struct srp_host *srp_host;
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struct Scsi_Host *scsi_host;
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char target_name[32];
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unsigned int scsi_id;
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struct ib_sa_path_rec path;
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struct ib_sa_query *path_query;
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int path_query_id;
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struct ib_cm_id *cm_id;
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struct ib_cq *cq;
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struct ib_qp *qp;
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int max_ti_iu_len;
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s32 req_lim;
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unsigned rx_head;
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struct srp_iu *rx_ring[SRP_RQ_SIZE];
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unsigned tx_head;
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unsigned tx_tail;
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struct srp_iu *tx_ring[SRP_SQ_SIZE + 1];
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int req_head;
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struct list_head req_queue;
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struct srp_request req_ring[SRP_SQ_SIZE];
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struct work_struct work;
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struct list_head list;
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struct completion done;
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int status;
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enum srp_target_state state;
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};
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struct srp_iu {
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dma_addr_t dma;
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void *buf;
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size_t size;
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enum dma_data_direction direction;
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};
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#endif /* IB_SRP_H */
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