1691 строка
41 KiB
C
1691 строка
41 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.c 3932 2005-11-01 17:19:29Z roland $
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/string.h>
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#include <linux/parser.h>
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#include <linux/random.h>
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#include <linux/jiffies.h>
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#include <asm/atomic.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_dbg.h>
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#include <scsi/srp.h>
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#include <rdma/ib_cache.h>
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#include "ib_srp.h"
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#define DRV_NAME "ib_srp"
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#define PFX DRV_NAME ": "
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#define DRV_VERSION "0.2"
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#define DRV_RELDATE "November 1, 2005"
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MODULE_AUTHOR("Roland Dreier");
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MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
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"v" DRV_VERSION " (" DRV_RELDATE ")");
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MODULE_LICENSE("Dual BSD/GPL");
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static int topspin_workarounds = 1;
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module_param(topspin_workarounds, int, 0444);
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MODULE_PARM_DESC(topspin_workarounds,
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"Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
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static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
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static void srp_add_one(struct ib_device *device);
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static void srp_remove_one(struct ib_device *device);
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static void srp_completion(struct ib_cq *cq, void *target_ptr);
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static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
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static struct ib_client srp_client = {
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.name = "srp",
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.add = srp_add_one,
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.remove = srp_remove_one
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};
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static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
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{
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return (struct srp_target_port *) host->hostdata;
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}
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static const char *srp_target_info(struct Scsi_Host *host)
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{
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return host_to_target(host)->target_name;
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}
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static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
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gfp_t gfp_mask,
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enum dma_data_direction direction)
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{
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struct srp_iu *iu;
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iu = kmalloc(sizeof *iu, gfp_mask);
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if (!iu)
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goto out;
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iu->buf = kzalloc(size, gfp_mask);
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if (!iu->buf)
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goto out_free_iu;
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iu->dma = dma_map_single(host->dev->dma_device, iu->buf, size, direction);
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if (dma_mapping_error(iu->dma))
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goto out_free_buf;
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iu->size = size;
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iu->direction = direction;
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return iu;
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out_free_buf:
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kfree(iu->buf);
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out_free_iu:
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kfree(iu);
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out:
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return NULL;
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}
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static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
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{
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if (!iu)
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return;
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dma_unmap_single(host->dev->dma_device, iu->dma, iu->size, iu->direction);
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kfree(iu->buf);
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kfree(iu);
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}
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static void srp_qp_event(struct ib_event *event, void *context)
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{
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printk(KERN_ERR PFX "QP event %d\n", event->event);
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}
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static int srp_init_qp(struct srp_target_port *target,
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struct ib_qp *qp)
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{
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struct ib_qp_attr *attr;
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int ret;
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attr = kmalloc(sizeof *attr, GFP_KERNEL);
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if (!attr)
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return -ENOMEM;
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ret = ib_find_cached_pkey(target->srp_host->dev,
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target->srp_host->port,
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be16_to_cpu(target->path.pkey),
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&attr->pkey_index);
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if (ret)
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goto out;
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attr->qp_state = IB_QPS_INIT;
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attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
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IB_ACCESS_REMOTE_WRITE);
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attr->port_num = target->srp_host->port;
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ret = ib_modify_qp(qp, attr,
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IB_QP_STATE |
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IB_QP_PKEY_INDEX |
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IB_QP_ACCESS_FLAGS |
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IB_QP_PORT);
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out:
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kfree(attr);
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return ret;
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}
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static int srp_create_target_ib(struct srp_target_port *target)
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{
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struct ib_qp_init_attr *init_attr;
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int ret;
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init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
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if (!init_attr)
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return -ENOMEM;
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target->cq = ib_create_cq(target->srp_host->dev, srp_completion,
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NULL, target, SRP_CQ_SIZE);
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if (IS_ERR(target->cq)) {
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ret = PTR_ERR(target->cq);
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goto out;
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}
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ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
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init_attr->event_handler = srp_qp_event;
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init_attr->cap.max_send_wr = SRP_SQ_SIZE;
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init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
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init_attr->cap.max_recv_sge = 1;
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init_attr->cap.max_send_sge = 1;
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init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
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init_attr->qp_type = IB_QPT_RC;
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init_attr->send_cq = target->cq;
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init_attr->recv_cq = target->cq;
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target->qp = ib_create_qp(target->srp_host->pd, init_attr);
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if (IS_ERR(target->qp)) {
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ret = PTR_ERR(target->qp);
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ib_destroy_cq(target->cq);
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goto out;
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}
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ret = srp_init_qp(target, target->qp);
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if (ret) {
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ib_destroy_qp(target->qp);
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ib_destroy_cq(target->cq);
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goto out;
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}
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out:
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kfree(init_attr);
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return ret;
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}
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static void srp_free_target_ib(struct srp_target_port *target)
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{
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int i;
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ib_destroy_qp(target->qp);
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ib_destroy_cq(target->cq);
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for (i = 0; i < SRP_RQ_SIZE; ++i)
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srp_free_iu(target->srp_host, target->rx_ring[i]);
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for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
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srp_free_iu(target->srp_host, target->tx_ring[i]);
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}
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static void srp_path_rec_completion(int status,
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struct ib_sa_path_rec *pathrec,
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void *target_ptr)
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{
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struct srp_target_port *target = target_ptr;
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target->status = status;
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if (status)
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printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
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else
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target->path = *pathrec;
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complete(&target->done);
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}
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static int srp_lookup_path(struct srp_target_port *target)
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{
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target->path.numb_path = 1;
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init_completion(&target->done);
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target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev,
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target->srp_host->port,
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&target->path,
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IB_SA_PATH_REC_DGID |
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IB_SA_PATH_REC_SGID |
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IB_SA_PATH_REC_NUMB_PATH |
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IB_SA_PATH_REC_PKEY,
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SRP_PATH_REC_TIMEOUT_MS,
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GFP_KERNEL,
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srp_path_rec_completion,
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target, &target->path_query);
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if (target->path_query_id < 0)
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return target->path_query_id;
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wait_for_completion(&target->done);
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if (target->status < 0)
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printk(KERN_WARNING PFX "Path record query failed\n");
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return target->status;
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}
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static int srp_send_req(struct srp_target_port *target)
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{
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struct {
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struct ib_cm_req_param param;
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struct srp_login_req priv;
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} *req = NULL;
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int status;
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req = kzalloc(sizeof *req, GFP_KERNEL);
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if (!req)
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return -ENOMEM;
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req->param.primary_path = &target->path;
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req->param.alternate_path = NULL;
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req->param.service_id = target->service_id;
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req->param.qp_num = target->qp->qp_num;
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req->param.qp_type = target->qp->qp_type;
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req->param.private_data = &req->priv;
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req->param.private_data_len = sizeof req->priv;
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req->param.flow_control = 1;
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get_random_bytes(&req->param.starting_psn, 4);
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req->param.starting_psn &= 0xffffff;
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/*
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* Pick some arbitrary defaults here; we could make these
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* module parameters if anyone cared about setting them.
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*/
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req->param.responder_resources = 4;
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req->param.remote_cm_response_timeout = 20;
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req->param.local_cm_response_timeout = 20;
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req->param.retry_count = 7;
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req->param.rnr_retry_count = 7;
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req->param.max_cm_retries = 15;
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req->priv.opcode = SRP_LOGIN_REQ;
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req->priv.tag = 0;
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req->priv.req_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
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req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
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SRP_BUF_FORMAT_INDIRECT);
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memcpy(req->priv.initiator_port_id, target->srp_host->initiator_port_id, 16);
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/*
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* Topspin/Cisco SRP targets will reject our login unless we
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* zero out the first 8 bytes of our initiator port ID. The
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* second 8 bytes must be our local node GUID, but we always
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* use that anyway.
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*/
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if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
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printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
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"activated for target GUID %016llx\n",
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(unsigned long long) be64_to_cpu(target->ioc_guid));
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memset(req->priv.initiator_port_id, 0, 8);
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}
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memcpy(req->priv.target_port_id, &target->id_ext, 8);
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memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
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status = ib_send_cm_req(target->cm_id, &req->param);
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kfree(req);
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return status;
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}
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static void srp_disconnect_target(struct srp_target_port *target)
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{
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/* XXX should send SRP_I_LOGOUT request */
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init_completion(&target->done);
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ib_send_cm_dreq(target->cm_id, NULL, 0);
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wait_for_completion(&target->done);
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}
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static void srp_remove_work(void *target_ptr)
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{
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struct srp_target_port *target = target_ptr;
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spin_lock_irq(target->scsi_host->host_lock);
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if (target->state != SRP_TARGET_DEAD) {
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spin_unlock_irq(target->scsi_host->host_lock);
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scsi_host_put(target->scsi_host);
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return;
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}
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target->state = SRP_TARGET_REMOVED;
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spin_unlock_irq(target->scsi_host->host_lock);
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mutex_lock(&target->srp_host->target_mutex);
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list_del(&target->list);
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mutex_unlock(&target->srp_host->target_mutex);
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scsi_remove_host(target->scsi_host);
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ib_destroy_cm_id(target->cm_id);
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srp_free_target_ib(target);
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scsi_host_put(target->scsi_host);
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/* And another put to really free the target port... */
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scsi_host_put(target->scsi_host);
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}
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static int srp_connect_target(struct srp_target_port *target)
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{
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int ret;
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ret = srp_lookup_path(target);
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if (ret)
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return ret;
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while (1) {
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init_completion(&target->done);
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ret = srp_send_req(target);
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if (ret)
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return ret;
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wait_for_completion(&target->done);
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/*
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* The CM event handling code will set status to
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* SRP_PORT_REDIRECT if we get a port redirect REJ
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* back, or SRP_DLID_REDIRECT if we get a lid/qp
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* redirect REJ back.
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*/
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switch (target->status) {
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case 0:
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return 0;
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case SRP_PORT_REDIRECT:
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ret = srp_lookup_path(target);
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if (ret)
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return ret;
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break;
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case SRP_DLID_REDIRECT:
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break;
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default:
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return target->status;
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}
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}
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}
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static int srp_reconnect_target(struct srp_target_port *target)
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{
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struct ib_cm_id *new_cm_id;
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struct ib_qp_attr qp_attr;
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struct srp_request *req;
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struct ib_wc wc;
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int ret;
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int i;
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spin_lock_irq(target->scsi_host->host_lock);
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if (target->state != SRP_TARGET_LIVE) {
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spin_unlock_irq(target->scsi_host->host_lock);
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return -EAGAIN;
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}
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target->state = SRP_TARGET_CONNECTING;
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spin_unlock_irq(target->scsi_host->host_lock);
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srp_disconnect_target(target);
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/*
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* Now get a new local CM ID so that we avoid confusing the
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* target in case things are really fouled up.
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*/
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new_cm_id = ib_create_cm_id(target->srp_host->dev,
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srp_cm_handler, target);
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if (IS_ERR(new_cm_id)) {
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ret = PTR_ERR(new_cm_id);
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goto err;
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}
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ib_destroy_cm_id(target->cm_id);
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target->cm_id = new_cm_id;
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qp_attr.qp_state = IB_QPS_RESET;
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ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
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if (ret)
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goto err;
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ret = srp_init_qp(target, target->qp);
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if (ret)
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goto err;
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while (ib_poll_cq(target->cq, 1, &wc) > 0)
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; /* nothing */
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list_for_each_entry(req, &target->req_queue, list) {
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req->scmnd->result = DID_RESET << 16;
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req->scmnd->scsi_done(req->scmnd);
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}
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target->rx_head = 0;
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target->tx_head = 0;
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target->tx_tail = 0;
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target->req_head = 0;
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for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
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target->req_ring[i].next = i + 1;
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target->req_ring[SRP_SQ_SIZE - 1].next = -1;
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INIT_LIST_HEAD(&target->req_queue);
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ret = srp_connect_target(target);
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if (ret)
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goto err;
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spin_lock_irq(target->scsi_host->host_lock);
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if (target->state == SRP_TARGET_CONNECTING) {
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ret = 0;
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target->state = SRP_TARGET_LIVE;
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} else
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ret = -EAGAIN;
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spin_unlock_irq(target->scsi_host->host_lock);
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return ret;
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err:
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printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
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|
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/*
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* We couldn't reconnect, so kill our target port off.
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* However, we have to defer the real removal because we might
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* be in the context of the SCSI error handler now, which
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* would deadlock if we call scsi_remove_host().
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*/
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spin_lock_irq(target->scsi_host->host_lock);
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if (target->state == SRP_TARGET_CONNECTING) {
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target->state = SRP_TARGET_DEAD;
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INIT_WORK(&target->work, srp_remove_work, target);
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schedule_work(&target->work);
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}
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spin_unlock_irq(target->scsi_host->host_lock);
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|
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return ret;
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}
|
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|
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static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
|
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struct srp_request *req)
|
|
{
|
|
struct srp_cmd *cmd = req->cmd->buf;
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|
int len;
|
|
u8 fmt;
|
|
|
|
if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
|
|
return sizeof (struct srp_cmd);
|
|
|
|
if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
|
|
scmnd->sc_data_direction != DMA_TO_DEVICE) {
|
|
printk(KERN_WARNING PFX "Unhandled data direction %d\n",
|
|
scmnd->sc_data_direction);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (scmnd->use_sg) {
|
|
struct scatterlist *scat = scmnd->request_buffer;
|
|
int n;
|
|
int i;
|
|
|
|
n = dma_map_sg(target->srp_host->dev->dma_device,
|
|
scat, scmnd->use_sg, scmnd->sc_data_direction);
|
|
|
|
if (n == 1) {
|
|
struct srp_direct_buf *buf = (void *) cmd->add_data;
|
|
|
|
fmt = SRP_DATA_DESC_DIRECT;
|
|
|
|
buf->va = cpu_to_be64(sg_dma_address(scat));
|
|
buf->key = cpu_to_be32(target->srp_host->mr->rkey);
|
|
buf->len = cpu_to_be32(sg_dma_len(scat));
|
|
|
|
len = sizeof (struct srp_cmd) +
|
|
sizeof (struct srp_direct_buf);
|
|
} else {
|
|
struct srp_indirect_buf *buf = (void *) cmd->add_data;
|
|
u32 datalen = 0;
|
|
|
|
fmt = SRP_DATA_DESC_INDIRECT;
|
|
|
|
if (scmnd->sc_data_direction == DMA_TO_DEVICE)
|
|
cmd->data_out_desc_cnt = n;
|
|
else
|
|
cmd->data_in_desc_cnt = n;
|
|
|
|
buf->table_desc.va = cpu_to_be64(req->cmd->dma +
|
|
sizeof *cmd +
|
|
sizeof *buf);
|
|
buf->table_desc.key =
|
|
cpu_to_be32(target->srp_host->mr->rkey);
|
|
buf->table_desc.len =
|
|
cpu_to_be32(n * sizeof (struct srp_direct_buf));
|
|
|
|
for (i = 0; i < n; ++i) {
|
|
buf->desc_list[i].va = cpu_to_be64(sg_dma_address(&scat[i]));
|
|
buf->desc_list[i].key =
|
|
cpu_to_be32(target->srp_host->mr->rkey);
|
|
buf->desc_list[i].len = cpu_to_be32(sg_dma_len(&scat[i]));
|
|
|
|
datalen += sg_dma_len(&scat[i]);
|
|
}
|
|
|
|
buf->len = cpu_to_be32(datalen);
|
|
|
|
len = sizeof (struct srp_cmd) +
|
|
sizeof (struct srp_indirect_buf) +
|
|
n * sizeof (struct srp_direct_buf);
|
|
}
|
|
} else {
|
|
struct srp_direct_buf *buf = (void *) cmd->add_data;
|
|
dma_addr_t dma;
|
|
|
|
dma = dma_map_single(target->srp_host->dev->dma_device,
|
|
scmnd->request_buffer, scmnd->request_bufflen,
|
|
scmnd->sc_data_direction);
|
|
if (dma_mapping_error(dma)) {
|
|
printk(KERN_WARNING PFX "unable to map %p/%d (dir %d)\n",
|
|
scmnd->request_buffer, (int) scmnd->request_bufflen,
|
|
scmnd->sc_data_direction);
|
|
return -EINVAL;
|
|
}
|
|
|
|
pci_unmap_addr_set(req, direct_mapping, dma);
|
|
|
|
buf->va = cpu_to_be64(dma);
|
|
buf->key = cpu_to_be32(target->srp_host->mr->rkey);
|
|
buf->len = cpu_to_be32(scmnd->request_bufflen);
|
|
|
|
fmt = SRP_DATA_DESC_DIRECT;
|
|
|
|
len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
|
|
}
|
|
|
|
if (scmnd->sc_data_direction == DMA_TO_DEVICE)
|
|
cmd->buf_fmt = fmt << 4;
|
|
else
|
|
cmd->buf_fmt = fmt;
|
|
|
|
|
|
return len;
|
|
}
|
|
|
|
static void srp_unmap_data(struct scsi_cmnd *scmnd,
|
|
struct srp_target_port *target,
|
|
struct srp_request *req)
|
|
{
|
|
if (!scmnd->request_buffer ||
|
|
(scmnd->sc_data_direction != DMA_TO_DEVICE &&
|
|
scmnd->sc_data_direction != DMA_FROM_DEVICE))
|
|
return;
|
|
|
|
if (scmnd->use_sg)
|
|
dma_unmap_sg(target->srp_host->dev->dma_device,
|
|
(struct scatterlist *) scmnd->request_buffer,
|
|
scmnd->use_sg, scmnd->sc_data_direction);
|
|
else
|
|
dma_unmap_single(target->srp_host->dev->dma_device,
|
|
pci_unmap_addr(req, direct_mapping),
|
|
scmnd->request_bufflen,
|
|
scmnd->sc_data_direction);
|
|
}
|
|
|
|
static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
|
|
{
|
|
struct srp_request *req;
|
|
struct scsi_cmnd *scmnd;
|
|
unsigned long flags;
|
|
s32 delta;
|
|
|
|
delta = (s32) be32_to_cpu(rsp->req_lim_delta);
|
|
|
|
spin_lock_irqsave(target->scsi_host->host_lock, flags);
|
|
|
|
target->req_lim += delta;
|
|
|
|
req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
|
|
|
|
if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
|
|
if (be32_to_cpu(rsp->resp_data_len) < 4)
|
|
req->tsk_status = -1;
|
|
else
|
|
req->tsk_status = rsp->data[3];
|
|
complete(&req->done);
|
|
} else {
|
|
scmnd = req->scmnd;
|
|
if (!scmnd)
|
|
printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
|
|
(unsigned long long) rsp->tag);
|
|
scmnd->result = rsp->status;
|
|
|
|
if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
|
|
memcpy(scmnd->sense_buffer, rsp->data +
|
|
be32_to_cpu(rsp->resp_data_len),
|
|
min_t(int, be32_to_cpu(rsp->sense_data_len),
|
|
SCSI_SENSE_BUFFERSIZE));
|
|
}
|
|
|
|
if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
|
|
scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
|
|
else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
|
|
scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
|
|
|
|
srp_unmap_data(scmnd, target, req);
|
|
|
|
if (!req->tsk_mgmt) {
|
|
req->scmnd = NULL;
|
|
scmnd->host_scribble = (void *) -1L;
|
|
scmnd->scsi_done(scmnd);
|
|
|
|
list_del(&req->list);
|
|
req->next = target->req_head;
|
|
target->req_head = rsp->tag & ~SRP_TAG_TSK_MGMT;
|
|
} else
|
|
req->cmd_done = 1;
|
|
}
|
|
|
|
spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
|
|
}
|
|
|
|
static void srp_reconnect_work(void *target_ptr)
|
|
{
|
|
struct srp_target_port *target = target_ptr;
|
|
|
|
srp_reconnect_target(target);
|
|
}
|
|
|
|
static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
|
|
{
|
|
struct srp_iu *iu;
|
|
u8 opcode;
|
|
|
|
iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
|
|
|
|
dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
|
|
target->max_ti_iu_len, DMA_FROM_DEVICE);
|
|
|
|
opcode = *(u8 *) iu->buf;
|
|
|
|
if (0) {
|
|
int i;
|
|
|
|
printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
|
|
|
|
for (i = 0; i < wc->byte_len; ++i) {
|
|
if (i % 8 == 0)
|
|
printk(KERN_ERR " [%02x] ", i);
|
|
printk(" %02x", ((u8 *) iu->buf)[i]);
|
|
if ((i + 1) % 8 == 0)
|
|
printk("\n");
|
|
}
|
|
|
|
if (wc->byte_len % 8)
|
|
printk("\n");
|
|
}
|
|
|
|
switch (opcode) {
|
|
case SRP_RSP:
|
|
srp_process_rsp(target, iu->buf);
|
|
break;
|
|
|
|
case SRP_T_LOGOUT:
|
|
/* XXX Handle target logout */
|
|
printk(KERN_WARNING PFX "Got target logout request\n");
|
|
break;
|
|
|
|
default:
|
|
printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
|
|
break;
|
|
}
|
|
|
|
dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
|
|
target->max_ti_iu_len, DMA_FROM_DEVICE);
|
|
}
|
|
|
|
static void srp_completion(struct ib_cq *cq, void *target_ptr)
|
|
{
|
|
struct srp_target_port *target = target_ptr;
|
|
struct ib_wc wc;
|
|
unsigned long flags;
|
|
|
|
ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
|
|
while (ib_poll_cq(cq, 1, &wc) > 0) {
|
|
if (wc.status) {
|
|
printk(KERN_ERR PFX "failed %s status %d\n",
|
|
wc.wr_id & SRP_OP_RECV ? "receive" : "send",
|
|
wc.status);
|
|
spin_lock_irqsave(target->scsi_host->host_lock, flags);
|
|
if (target->state == SRP_TARGET_LIVE)
|
|
schedule_work(&target->work);
|
|
spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
|
|
break;
|
|
}
|
|
|
|
if (wc.wr_id & SRP_OP_RECV)
|
|
srp_handle_recv(target, &wc);
|
|
else
|
|
++target->tx_tail;
|
|
}
|
|
}
|
|
|
|
static int __srp_post_recv(struct srp_target_port *target)
|
|
{
|
|
struct srp_iu *iu;
|
|
struct ib_sge list;
|
|
struct ib_recv_wr wr, *bad_wr;
|
|
unsigned int next;
|
|
int ret;
|
|
|
|
next = target->rx_head & (SRP_RQ_SIZE - 1);
|
|
wr.wr_id = next | SRP_OP_RECV;
|
|
iu = target->rx_ring[next];
|
|
|
|
list.addr = iu->dma;
|
|
list.length = iu->size;
|
|
list.lkey = target->srp_host->mr->lkey;
|
|
|
|
wr.next = NULL;
|
|
wr.sg_list = &list;
|
|
wr.num_sge = 1;
|
|
|
|
ret = ib_post_recv(target->qp, &wr, &bad_wr);
|
|
if (!ret)
|
|
++target->rx_head;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int srp_post_recv(struct srp_target_port *target)
|
|
{
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(target->scsi_host->host_lock, flags);
|
|
ret = __srp_post_recv(target);
|
|
spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Must be called with target->scsi_host->host_lock held to protect
|
|
* req_lim and tx_head. Lock cannot be dropped between call here and
|
|
* call to __srp_post_send().
|
|
*/
|
|
static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
|
|
{
|
|
if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
|
|
return NULL;
|
|
|
|
if (unlikely(target->req_lim < 1)) {
|
|
if (printk_ratelimit())
|
|
printk(KERN_DEBUG PFX "Target has req_lim %d\n",
|
|
target->req_lim);
|
|
return NULL;
|
|
}
|
|
|
|
return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
|
|
}
|
|
|
|
/*
|
|
* Must be called with target->scsi_host->host_lock held to protect
|
|
* req_lim and tx_head.
|
|
*/
|
|
static int __srp_post_send(struct srp_target_port *target,
|
|
struct srp_iu *iu, int len)
|
|
{
|
|
struct ib_sge list;
|
|
struct ib_send_wr wr, *bad_wr;
|
|
int ret = 0;
|
|
|
|
list.addr = iu->dma;
|
|
list.length = len;
|
|
list.lkey = target->srp_host->mr->lkey;
|
|
|
|
wr.next = NULL;
|
|
wr.wr_id = target->tx_head & SRP_SQ_SIZE;
|
|
wr.sg_list = &list;
|
|
wr.num_sge = 1;
|
|
wr.opcode = IB_WR_SEND;
|
|
wr.send_flags = IB_SEND_SIGNALED;
|
|
|
|
ret = ib_post_send(target->qp, &wr, &bad_wr);
|
|
|
|
if (!ret) {
|
|
++target->tx_head;
|
|
--target->req_lim;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int srp_queuecommand(struct scsi_cmnd *scmnd,
|
|
void (*done)(struct scsi_cmnd *))
|
|
{
|
|
struct srp_target_port *target = host_to_target(scmnd->device->host);
|
|
struct srp_request *req;
|
|
struct srp_iu *iu;
|
|
struct srp_cmd *cmd;
|
|
long req_index;
|
|
int len;
|
|
|
|
if (target->state == SRP_TARGET_CONNECTING)
|
|
goto err;
|
|
|
|
if (target->state == SRP_TARGET_DEAD ||
|
|
target->state == SRP_TARGET_REMOVED) {
|
|
scmnd->result = DID_BAD_TARGET << 16;
|
|
done(scmnd);
|
|
return 0;
|
|
}
|
|
|
|
iu = __srp_get_tx_iu(target);
|
|
if (!iu)
|
|
goto err;
|
|
|
|
dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
|
|
SRP_MAX_IU_LEN, DMA_TO_DEVICE);
|
|
|
|
req_index = target->req_head;
|
|
|
|
scmnd->scsi_done = done;
|
|
scmnd->result = 0;
|
|
scmnd->host_scribble = (void *) req_index;
|
|
|
|
cmd = iu->buf;
|
|
memset(cmd, 0, sizeof *cmd);
|
|
|
|
cmd->opcode = SRP_CMD;
|
|
cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
|
|
cmd->tag = req_index;
|
|
memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
|
|
|
|
req = &target->req_ring[req_index];
|
|
|
|
req->scmnd = scmnd;
|
|
req->cmd = iu;
|
|
req->cmd_done = 0;
|
|
req->tsk_mgmt = NULL;
|
|
|
|
len = srp_map_data(scmnd, target, req);
|
|
if (len < 0) {
|
|
printk(KERN_ERR PFX "Failed to map data\n");
|
|
goto err;
|
|
}
|
|
|
|
if (__srp_post_recv(target)) {
|
|
printk(KERN_ERR PFX "Recv failed\n");
|
|
goto err_unmap;
|
|
}
|
|
|
|
dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
|
|
SRP_MAX_IU_LEN, DMA_TO_DEVICE);
|
|
|
|
if (__srp_post_send(target, iu, len)) {
|
|
printk(KERN_ERR PFX "Send failed\n");
|
|
goto err_unmap;
|
|
}
|
|
|
|
target->req_head = req->next;
|
|
list_add_tail(&req->list, &target->req_queue);
|
|
|
|
return 0;
|
|
|
|
err_unmap:
|
|
srp_unmap_data(scmnd, target, req);
|
|
|
|
err:
|
|
return SCSI_MLQUEUE_HOST_BUSY;
|
|
}
|
|
|
|
static int srp_alloc_iu_bufs(struct srp_target_port *target)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < SRP_RQ_SIZE; ++i) {
|
|
target->rx_ring[i] = srp_alloc_iu(target->srp_host,
|
|
target->max_ti_iu_len,
|
|
GFP_KERNEL, DMA_FROM_DEVICE);
|
|
if (!target->rx_ring[i])
|
|
goto err;
|
|
}
|
|
|
|
for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
|
|
target->tx_ring[i] = srp_alloc_iu(target->srp_host,
|
|
SRP_MAX_IU_LEN,
|
|
GFP_KERNEL, DMA_TO_DEVICE);
|
|
if (!target->tx_ring[i])
|
|
goto err;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err:
|
|
for (i = 0; i < SRP_RQ_SIZE; ++i) {
|
|
srp_free_iu(target->srp_host, target->rx_ring[i]);
|
|
target->rx_ring[i] = NULL;
|
|
}
|
|
|
|
for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
|
|
srp_free_iu(target->srp_host, target->tx_ring[i]);
|
|
target->tx_ring[i] = NULL;
|
|
}
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
|
|
struct ib_cm_event *event,
|
|
struct srp_target_port *target)
|
|
{
|
|
struct ib_class_port_info *cpi;
|
|
int opcode;
|
|
|
|
switch (event->param.rej_rcvd.reason) {
|
|
case IB_CM_REJ_PORT_CM_REDIRECT:
|
|
cpi = event->param.rej_rcvd.ari;
|
|
target->path.dlid = cpi->redirect_lid;
|
|
target->path.pkey = cpi->redirect_pkey;
|
|
cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
|
|
memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
|
|
|
|
target->status = target->path.dlid ?
|
|
SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
|
|
break;
|
|
|
|
case IB_CM_REJ_PORT_REDIRECT:
|
|
if (topspin_workarounds &&
|
|
!memcmp(&target->ioc_guid, topspin_oui, 3)) {
|
|
/*
|
|
* Topspin/Cisco SRP gateways incorrectly send
|
|
* reject reason code 25 when they mean 24
|
|
* (port redirect).
|
|
*/
|
|
memcpy(target->path.dgid.raw,
|
|
event->param.rej_rcvd.ari, 16);
|
|
|
|
printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
|
|
(unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
|
|
(unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
|
|
|
|
target->status = SRP_PORT_REDIRECT;
|
|
} else {
|
|
printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
|
|
target->status = -ECONNRESET;
|
|
}
|
|
break;
|
|
|
|
case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
|
|
printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
|
|
target->status = -ECONNRESET;
|
|
break;
|
|
|
|
case IB_CM_REJ_CONSUMER_DEFINED:
|
|
opcode = *(u8 *) event->private_data;
|
|
if (opcode == SRP_LOGIN_REJ) {
|
|
struct srp_login_rej *rej = event->private_data;
|
|
u32 reason = be32_to_cpu(rej->reason);
|
|
|
|
if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
|
|
printk(KERN_WARNING PFX
|
|
"SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
|
|
else
|
|
printk(KERN_WARNING PFX
|
|
"SRP LOGIN REJECTED, reason 0x%08x\n", reason);
|
|
} else
|
|
printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
|
|
" opcode 0x%02x\n", opcode);
|
|
target->status = -ECONNRESET;
|
|
break;
|
|
|
|
default:
|
|
printk(KERN_WARNING " REJ reason 0x%x\n",
|
|
event->param.rej_rcvd.reason);
|
|
target->status = -ECONNRESET;
|
|
}
|
|
}
|
|
|
|
static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
|
|
{
|
|
struct srp_target_port *target = cm_id->context;
|
|
struct ib_qp_attr *qp_attr = NULL;
|
|
int attr_mask = 0;
|
|
int comp = 0;
|
|
int opcode = 0;
|
|
|
|
switch (event->event) {
|
|
case IB_CM_REQ_ERROR:
|
|
printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
|
|
comp = 1;
|
|
target->status = -ECONNRESET;
|
|
break;
|
|
|
|
case IB_CM_REP_RECEIVED:
|
|
comp = 1;
|
|
opcode = *(u8 *) event->private_data;
|
|
|
|
if (opcode == SRP_LOGIN_RSP) {
|
|
struct srp_login_rsp *rsp = event->private_data;
|
|
|
|
target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
|
|
target->req_lim = be32_to_cpu(rsp->req_lim_delta);
|
|
|
|
target->scsi_host->can_queue = min(target->req_lim,
|
|
target->scsi_host->can_queue);
|
|
} else {
|
|
printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
|
|
target->status = -ECONNRESET;
|
|
break;
|
|
}
|
|
|
|
target->status = srp_alloc_iu_bufs(target);
|
|
if (target->status)
|
|
break;
|
|
|
|
qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
|
|
if (!qp_attr) {
|
|
target->status = -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
qp_attr->qp_state = IB_QPS_RTR;
|
|
target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
|
|
if (target->status)
|
|
break;
|
|
|
|
target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
|
|
if (target->status)
|
|
break;
|
|
|
|
target->status = srp_post_recv(target);
|
|
if (target->status)
|
|
break;
|
|
|
|
qp_attr->qp_state = IB_QPS_RTS;
|
|
target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
|
|
if (target->status)
|
|
break;
|
|
|
|
target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
|
|
if (target->status)
|
|
break;
|
|
|
|
target->status = ib_send_cm_rtu(cm_id, NULL, 0);
|
|
if (target->status)
|
|
break;
|
|
|
|
break;
|
|
|
|
case IB_CM_REJ_RECEIVED:
|
|
printk(KERN_DEBUG PFX "REJ received\n");
|
|
comp = 1;
|
|
|
|
srp_cm_rej_handler(cm_id, event, target);
|
|
break;
|
|
|
|
case IB_CM_MRA_RECEIVED:
|
|
printk(KERN_ERR PFX "MRA received\n");
|
|
break;
|
|
|
|
case IB_CM_DREP_RECEIVED:
|
|
break;
|
|
|
|
case IB_CM_TIMEWAIT_EXIT:
|
|
printk(KERN_ERR PFX "connection closed\n");
|
|
|
|
comp = 1;
|
|
target->status = 0;
|
|
break;
|
|
|
|
default:
|
|
printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
|
|
break;
|
|
}
|
|
|
|
if (comp)
|
|
complete(&target->done);
|
|
|
|
kfree(qp_attr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int srp_send_tsk_mgmt(struct scsi_cmnd *scmnd, u8 func)
|
|
{
|
|
struct srp_target_port *target = host_to_target(scmnd->device->host);
|
|
struct srp_request *req;
|
|
struct srp_iu *iu;
|
|
struct srp_tsk_mgmt *tsk_mgmt;
|
|
int req_index;
|
|
int ret = FAILED;
|
|
|
|
spin_lock_irq(target->scsi_host->host_lock);
|
|
|
|
if (scmnd->host_scribble == (void *) -1L)
|
|
goto out;
|
|
|
|
req_index = (long) scmnd->host_scribble;
|
|
printk(KERN_ERR "Abort for req_index %d\n", req_index);
|
|
|
|
req = &target->req_ring[req_index];
|
|
init_completion(&req->done);
|
|
|
|
iu = __srp_get_tx_iu(target);
|
|
if (!iu)
|
|
goto out;
|
|
|
|
tsk_mgmt = iu->buf;
|
|
memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
|
|
|
|
tsk_mgmt->opcode = SRP_TSK_MGMT;
|
|
tsk_mgmt->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
|
|
tsk_mgmt->tag = req_index | SRP_TAG_TSK_MGMT;
|
|
tsk_mgmt->tsk_mgmt_func = func;
|
|
tsk_mgmt->task_tag = req_index;
|
|
|
|
if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
|
|
goto out;
|
|
|
|
req->tsk_mgmt = iu;
|
|
|
|
spin_unlock_irq(target->scsi_host->host_lock);
|
|
if (!wait_for_completion_timeout(&req->done,
|
|
msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
|
|
return FAILED;
|
|
spin_lock_irq(target->scsi_host->host_lock);
|
|
|
|
if (req->cmd_done) {
|
|
list_del(&req->list);
|
|
req->next = target->req_head;
|
|
target->req_head = req_index;
|
|
|
|
scmnd->scsi_done(scmnd);
|
|
} else if (!req->tsk_status) {
|
|
scmnd->result = DID_ABORT << 16;
|
|
ret = SUCCESS;
|
|
}
|
|
|
|
out:
|
|
spin_unlock_irq(target->scsi_host->host_lock);
|
|
return ret;
|
|
}
|
|
|
|
static int srp_abort(struct scsi_cmnd *scmnd)
|
|
{
|
|
printk(KERN_ERR "SRP abort called\n");
|
|
|
|
return srp_send_tsk_mgmt(scmnd, SRP_TSK_ABORT_TASK);
|
|
}
|
|
|
|
static int srp_reset_device(struct scsi_cmnd *scmnd)
|
|
{
|
|
printk(KERN_ERR "SRP reset_device called\n");
|
|
|
|
return srp_send_tsk_mgmt(scmnd, SRP_TSK_LUN_RESET);
|
|
}
|
|
|
|
static int srp_reset_host(struct scsi_cmnd *scmnd)
|
|
{
|
|
struct srp_target_port *target = host_to_target(scmnd->device->host);
|
|
int ret = FAILED;
|
|
|
|
printk(KERN_ERR PFX "SRP reset_host called\n");
|
|
|
|
if (!srp_reconnect_target(target))
|
|
ret = SUCCESS;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct scsi_host_template srp_template = {
|
|
.module = THIS_MODULE,
|
|
.name = DRV_NAME,
|
|
.info = srp_target_info,
|
|
.queuecommand = srp_queuecommand,
|
|
.eh_abort_handler = srp_abort,
|
|
.eh_device_reset_handler = srp_reset_device,
|
|
.eh_host_reset_handler = srp_reset_host,
|
|
.can_queue = SRP_SQ_SIZE,
|
|
.this_id = -1,
|
|
.sg_tablesize = SRP_MAX_INDIRECT,
|
|
.cmd_per_lun = SRP_SQ_SIZE,
|
|
.use_clustering = ENABLE_CLUSTERING
|
|
};
|
|
|
|
static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
|
|
{
|
|
sprintf(target->target_name, "SRP.T10:%016llX",
|
|
(unsigned long long) be64_to_cpu(target->id_ext));
|
|
|
|
if (scsi_add_host(target->scsi_host, host->dev->dma_device))
|
|
return -ENODEV;
|
|
|
|
mutex_lock(&host->target_mutex);
|
|
list_add_tail(&target->list, &host->target_list);
|
|
mutex_unlock(&host->target_mutex);
|
|
|
|
target->state = SRP_TARGET_LIVE;
|
|
|
|
/* XXX: are we supposed to have a definition of SCAN_WILD_CARD ?? */
|
|
scsi_scan_target(&target->scsi_host->shost_gendev,
|
|
0, target->scsi_id, ~0, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void srp_release_class_dev(struct class_device *class_dev)
|
|
{
|
|
struct srp_host *host =
|
|
container_of(class_dev, struct srp_host, class_dev);
|
|
|
|
complete(&host->released);
|
|
}
|
|
|
|
static struct class srp_class = {
|
|
.name = "infiniband_srp",
|
|
.release = srp_release_class_dev
|
|
};
|
|
|
|
/*
|
|
* Target ports are added by writing
|
|
*
|
|
* id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
|
|
* pkey=<P_Key>,service_id=<service ID>
|
|
*
|
|
* to the add_target sysfs attribute.
|
|
*/
|
|
enum {
|
|
SRP_OPT_ERR = 0,
|
|
SRP_OPT_ID_EXT = 1 << 0,
|
|
SRP_OPT_IOC_GUID = 1 << 1,
|
|
SRP_OPT_DGID = 1 << 2,
|
|
SRP_OPT_PKEY = 1 << 3,
|
|
SRP_OPT_SERVICE_ID = 1 << 4,
|
|
SRP_OPT_MAX_SECT = 1 << 5,
|
|
SRP_OPT_ALL = (SRP_OPT_ID_EXT |
|
|
SRP_OPT_IOC_GUID |
|
|
SRP_OPT_DGID |
|
|
SRP_OPT_PKEY |
|
|
SRP_OPT_SERVICE_ID),
|
|
};
|
|
|
|
static match_table_t srp_opt_tokens = {
|
|
{ SRP_OPT_ID_EXT, "id_ext=%s" },
|
|
{ SRP_OPT_IOC_GUID, "ioc_guid=%s" },
|
|
{ SRP_OPT_DGID, "dgid=%s" },
|
|
{ SRP_OPT_PKEY, "pkey=%x" },
|
|
{ SRP_OPT_SERVICE_ID, "service_id=%s" },
|
|
{ SRP_OPT_MAX_SECT, "max_sect=%d" },
|
|
{ SRP_OPT_ERR, NULL }
|
|
};
|
|
|
|
static int srp_parse_options(const char *buf, struct srp_target_port *target)
|
|
{
|
|
char *options, *sep_opt;
|
|
char *p;
|
|
char dgid[3];
|
|
substring_t args[MAX_OPT_ARGS];
|
|
int opt_mask = 0;
|
|
int token;
|
|
int ret = -EINVAL;
|
|
int i;
|
|
|
|
options = kstrdup(buf, GFP_KERNEL);
|
|
if (!options)
|
|
return -ENOMEM;
|
|
|
|
sep_opt = options;
|
|
while ((p = strsep(&sep_opt, ",")) != NULL) {
|
|
if (!*p)
|
|
continue;
|
|
|
|
token = match_token(p, srp_opt_tokens, args);
|
|
opt_mask |= token;
|
|
|
|
switch (token) {
|
|
case SRP_OPT_ID_EXT:
|
|
p = match_strdup(args);
|
|
target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
|
|
kfree(p);
|
|
break;
|
|
|
|
case SRP_OPT_IOC_GUID:
|
|
p = match_strdup(args);
|
|
target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
|
|
kfree(p);
|
|
break;
|
|
|
|
case SRP_OPT_DGID:
|
|
p = match_strdup(args);
|
|
if (strlen(p) != 32) {
|
|
printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < 16; ++i) {
|
|
strlcpy(dgid, p + i * 2, 3);
|
|
target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
|
|
}
|
|
break;
|
|
|
|
case SRP_OPT_PKEY:
|
|
if (match_hex(args, &token)) {
|
|
printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
|
|
goto out;
|
|
}
|
|
target->path.pkey = cpu_to_be16(token);
|
|
break;
|
|
|
|
case SRP_OPT_SERVICE_ID:
|
|
p = match_strdup(args);
|
|
target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
|
|
kfree(p);
|
|
break;
|
|
|
|
case SRP_OPT_MAX_SECT:
|
|
if (match_int(args, &token)) {
|
|
printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
|
|
goto out;
|
|
}
|
|
target->scsi_host->max_sectors = token;
|
|
break;
|
|
|
|
default:
|
|
printk(KERN_WARNING PFX "unknown parameter or missing value "
|
|
"'%s' in target creation request\n", p);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
|
|
ret = 0;
|
|
else
|
|
for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
|
|
if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
|
|
!(srp_opt_tokens[i].token & opt_mask))
|
|
printk(KERN_WARNING PFX "target creation request is "
|
|
"missing parameter '%s'\n",
|
|
srp_opt_tokens[i].pattern);
|
|
|
|
out:
|
|
kfree(options);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t srp_create_target(struct class_device *class_dev,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct srp_host *host =
|
|
container_of(class_dev, struct srp_host, class_dev);
|
|
struct Scsi_Host *target_host;
|
|
struct srp_target_port *target;
|
|
int ret;
|
|
int i;
|
|
|
|
target_host = scsi_host_alloc(&srp_template,
|
|
sizeof (struct srp_target_port));
|
|
if (!target_host)
|
|
return -ENOMEM;
|
|
|
|
target_host->max_lun = SRP_MAX_LUN;
|
|
|
|
target = host_to_target(target_host);
|
|
memset(target, 0, sizeof *target);
|
|
|
|
target->scsi_host = target_host;
|
|
target->srp_host = host;
|
|
|
|
INIT_WORK(&target->work, srp_reconnect_work, target);
|
|
|
|
for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
|
|
target->req_ring[i].next = i + 1;
|
|
target->req_ring[SRP_SQ_SIZE - 1].next = -1;
|
|
INIT_LIST_HEAD(&target->req_queue);
|
|
|
|
ret = srp_parse_options(buf, target);
|
|
if (ret)
|
|
goto err;
|
|
|
|
ib_get_cached_gid(host->dev, host->port, 0, &target->path.sgid);
|
|
|
|
printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
|
|
"service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
|
|
(unsigned long long) be64_to_cpu(target->id_ext),
|
|
(unsigned long long) be64_to_cpu(target->ioc_guid),
|
|
be16_to_cpu(target->path.pkey),
|
|
(unsigned long long) be64_to_cpu(target->service_id),
|
|
(int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
|
|
(int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
|
|
(int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
|
|
(int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
|
|
(int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
|
|
(int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
|
|
(int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
|
|
(int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
|
|
|
|
ret = srp_create_target_ib(target);
|
|
if (ret)
|
|
goto err;
|
|
|
|
target->cm_id = ib_create_cm_id(host->dev, srp_cm_handler, target);
|
|
if (IS_ERR(target->cm_id)) {
|
|
ret = PTR_ERR(target->cm_id);
|
|
goto err_free;
|
|
}
|
|
|
|
ret = srp_connect_target(target);
|
|
if (ret) {
|
|
printk(KERN_ERR PFX "Connection failed\n");
|
|
goto err_cm_id;
|
|
}
|
|
|
|
ret = srp_add_target(host, target);
|
|
if (ret)
|
|
goto err_disconnect;
|
|
|
|
return count;
|
|
|
|
err_disconnect:
|
|
srp_disconnect_target(target);
|
|
|
|
err_cm_id:
|
|
ib_destroy_cm_id(target->cm_id);
|
|
|
|
err_free:
|
|
srp_free_target_ib(target);
|
|
|
|
err:
|
|
scsi_host_put(target_host);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
|
|
|
|
static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
|
|
{
|
|
struct srp_host *host =
|
|
container_of(class_dev, struct srp_host, class_dev);
|
|
|
|
return sprintf(buf, "%s\n", host->dev->name);
|
|
}
|
|
|
|
static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
|
|
|
|
static ssize_t show_port(struct class_device *class_dev, char *buf)
|
|
{
|
|
struct srp_host *host =
|
|
container_of(class_dev, struct srp_host, class_dev);
|
|
|
|
return sprintf(buf, "%d\n", host->port);
|
|
}
|
|
|
|
static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
|
|
|
|
static struct srp_host *srp_add_port(struct ib_device *device, u8 port)
|
|
{
|
|
struct srp_host *host;
|
|
|
|
host = kzalloc(sizeof *host, GFP_KERNEL);
|
|
if (!host)
|
|
return NULL;
|
|
|
|
INIT_LIST_HEAD(&host->target_list);
|
|
mutex_init(&host->target_mutex);
|
|
init_completion(&host->released);
|
|
host->dev = device;
|
|
host->port = port;
|
|
|
|
host->initiator_port_id[7] = port;
|
|
memcpy(host->initiator_port_id + 8, &device->node_guid, 8);
|
|
|
|
host->pd = ib_alloc_pd(device);
|
|
if (IS_ERR(host->pd))
|
|
goto err_free;
|
|
|
|
host->mr = ib_get_dma_mr(host->pd,
|
|
IB_ACCESS_LOCAL_WRITE |
|
|
IB_ACCESS_REMOTE_READ |
|
|
IB_ACCESS_REMOTE_WRITE);
|
|
if (IS_ERR(host->mr))
|
|
goto err_pd;
|
|
|
|
host->class_dev.class = &srp_class;
|
|
host->class_dev.dev = device->dma_device;
|
|
snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
|
|
device->name, port);
|
|
|
|
if (class_device_register(&host->class_dev))
|
|
goto err_mr;
|
|
if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
|
|
goto err_class;
|
|
if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
|
|
goto err_class;
|
|
if (class_device_create_file(&host->class_dev, &class_device_attr_port))
|
|
goto err_class;
|
|
|
|
return host;
|
|
|
|
err_class:
|
|
class_device_unregister(&host->class_dev);
|
|
|
|
err_mr:
|
|
ib_dereg_mr(host->mr);
|
|
|
|
err_pd:
|
|
ib_dealloc_pd(host->pd);
|
|
|
|
err_free:
|
|
kfree(host);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void srp_add_one(struct ib_device *device)
|
|
{
|
|
struct list_head *dev_list;
|
|
struct srp_host *host;
|
|
int s, e, p;
|
|
|
|
dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
|
|
if (!dev_list)
|
|
return;
|
|
|
|
INIT_LIST_HEAD(dev_list);
|
|
|
|
if (device->node_type == IB_NODE_SWITCH) {
|
|
s = 0;
|
|
e = 0;
|
|
} else {
|
|
s = 1;
|
|
e = device->phys_port_cnt;
|
|
}
|
|
|
|
for (p = s; p <= e; ++p) {
|
|
host = srp_add_port(device, p);
|
|
if (host)
|
|
list_add_tail(&host->list, dev_list);
|
|
}
|
|
|
|
ib_set_client_data(device, &srp_client, dev_list);
|
|
}
|
|
|
|
static void srp_remove_one(struct ib_device *device)
|
|
{
|
|
struct list_head *dev_list;
|
|
struct srp_host *host, *tmp_host;
|
|
LIST_HEAD(target_list);
|
|
struct srp_target_port *target, *tmp_target;
|
|
unsigned long flags;
|
|
|
|
dev_list = ib_get_client_data(device, &srp_client);
|
|
|
|
list_for_each_entry_safe(host, tmp_host, dev_list, list) {
|
|
class_device_unregister(&host->class_dev);
|
|
/*
|
|
* Wait for the sysfs entry to go away, so that no new
|
|
* target ports can be created.
|
|
*/
|
|
wait_for_completion(&host->released);
|
|
|
|
/*
|
|
* Mark all target ports as removed, so we stop queueing
|
|
* commands and don't try to reconnect.
|
|
*/
|
|
mutex_lock(&host->target_mutex);
|
|
list_for_each_entry_safe(target, tmp_target,
|
|
&host->target_list, list) {
|
|
spin_lock_irqsave(target->scsi_host->host_lock, flags);
|
|
if (target->state != SRP_TARGET_REMOVED)
|
|
target->state = SRP_TARGET_REMOVED;
|
|
spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
|
|
}
|
|
mutex_unlock(&host->target_mutex);
|
|
|
|
/*
|
|
* Wait for any reconnection tasks that may have
|
|
* started before we marked our target ports as
|
|
* removed, and any target port removal tasks.
|
|
*/
|
|
flush_scheduled_work();
|
|
|
|
list_for_each_entry_safe(target, tmp_target,
|
|
&host->target_list, list) {
|
|
scsi_remove_host(target->scsi_host);
|
|
srp_disconnect_target(target);
|
|
ib_destroy_cm_id(target->cm_id);
|
|
srp_free_target_ib(target);
|
|
scsi_host_put(target->scsi_host);
|
|
}
|
|
|
|
ib_dereg_mr(host->mr);
|
|
ib_dealloc_pd(host->pd);
|
|
kfree(host);
|
|
}
|
|
|
|
kfree(dev_list);
|
|
}
|
|
|
|
static int __init srp_init_module(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = class_register(&srp_class);
|
|
if (ret) {
|
|
printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = ib_register_client(&srp_client);
|
|
if (ret) {
|
|
printk(KERN_ERR PFX "couldn't register IB client\n");
|
|
class_unregister(&srp_class);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit srp_cleanup_module(void)
|
|
{
|
|
ib_unregister_client(&srp_client);
|
|
class_unregister(&srp_class);
|
|
}
|
|
|
|
module_init(srp_init_module);
|
|
module_exit(srp_cleanup_module);
|