path: root/drivers/scsi/cxgb3i/cxgb3i_iscsi.c

/* cxgb3i_iscsi.c: Chelsio S3xx iSCSI driver.
 *
 * Copyright (c) 2008 Chelsio Communications, Inc.
 * Copyright (c) 2008 Mike Christie
 * Copyright (c) 2008 Red Hat, Inc.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation.
 *
 * Written by: Karen Xie (kxie@chelsio.com)
 */

#include <linux/inet.h>
#include <linux/crypto.h>
#include <net/tcp.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi.h>
#include <scsi/iscsi_proto.h>
#include <scsi/libiscsi.h>
#include <scsi/scsi_transport_iscsi.h>

#include "cxgb3i.h"
#include "cxgb3i_pdu.h"

#ifdef __DEBUG_CXGB3I_TAG__
#define cxgb3i_tag_debug	cxgb3i_log_debug
#else
#define cxgb3i_tag_debug(fmt...)
#endif

#ifdef __DEBUG_CXGB3I_API__
#define cxgb3i_api_debug	cxgb3i_log_debug
#else
#define cxgb3i_api_debug(fmt...)
#endif

/*
 * align pdu size to multiple of 512 for better performance
 */
#define align_pdu_size(n) do { n = (n) & (~511); } while (0)

static struct scsi_transport_template *cxgb3i_scsi_transport;
static struct scsi_host_template cxgb3i_host_template;
static struct iscsi_transport cxgb3i_iscsi_transport;
static unsigned char sw_tag_idx_bits;
static unsigned char sw_tag_age_bits;

static LIST_HEAD(cxgb3i_snic_list);
static DEFINE_RWLOCK(cxgb3i_snic_rwlock);

/**
 * cxgb3i_adapter_add - init a s3 adapter structure and any h/w settings
 * @t3dev: t3cdev adapter
 * return the resulting cxgb3i_adapter struct
 */
struct cxgb3i_adapter *cxgb3i_adapter_add(struct t3cdev *t3dev)
{
	struct cxgb3i_adapter *snic;
	struct adapter *adapter = tdev2adap(t3dev);
	int i;

	snic = kzalloc(sizeof(*snic), GFP_KERNEL);
	if (!snic) {
		cxgb3i_api_debug("cxgb3 %s, OOM.\n", t3dev->name);
		return NULL;
	}
	spin_lock_init(&snic->lock);

	snic->tdev = t3dev;
	snic->pdev = adapter->pdev;
	snic->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;

	if (cxgb3i_adapter_ddp_init(t3dev, &snic->tag_format,
				    &snic->tx_max_size,
				    &snic->rx_max_size) < 0)
		goto free_snic;

	for_each_port(adapter, i) {
		snic->hba[i] = cxgb3i_hba_host_add(snic, adapter->port[i]);
		if (!snic->hba[i])
			goto ulp_cleanup;
	}
	snic->hba_cnt = adapter->params.nports;

	/* add to the list */
	write_lock(&cxgb3i_snic_rwlock);
	list_add_tail(&snic->list_head, &cxgb3i_snic_list);
	write_unlock(&cxgb3i_snic_rwlock);

	return snic;

ulp_cleanup:
	cxgb3i_adapter_ddp_cleanup(t3dev);
free_snic:
	kfree(snic);
	return NULL;
}

/**
 * cxgb3i_adapter_remove - release all the resources held and cleanup any
 *	h/w settings
 * @t3dev: t3cdev adapter
 */
void cxgb3i_adapter_remove(struct t3cdev *t3dev)
{
	int i;
	struct cxgb3i_adapter *snic;

	/* remove from the list */
	write_lock(&cxgb3i_snic_rwlock);
	list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
		if (snic->tdev == t3dev) {
			list_del(&snic->list_head);
			break;
		}
	}
	write_unlock(&cxgb3i_snic_rwlock);

	if (snic) {
		for (i = 0; i < snic->hba_cnt; i++) {
			if (snic->hba[i]) {
				cxgb3i_hba_host_remove(snic->hba[i]);
				snic->hba[i] = NULL;
			}
		}

		/* release ddp resources */
		cxgb3i_adapter_ddp_cleanup(snic->tdev);
		kfree(snic);
	}
}

/**
 * cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure with a given
 *	net_device
 * @t3dev: t3cdev adapter
 */
struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev)
{
	struct cxgb3i_adapter *snic;
	int i;

	read_lock(&cxgb3i_snic_rwlock);
	list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
		for (i = 0; i < snic->hba_cnt; i++) {
			if (snic->hba[i]->ndev == ndev) {
				read_unlock(&cxgb3i_snic_rwlock);
				return snic->hba[i];
			}
		}
	}
	read_unlock(&cxgb3i_snic_rwlock);
	return NULL;
}

/**
 * cxgb3i_hba_host_add - register a new host with scsi/iscsi
 * @snic: the cxgb3i adapter
 * @ndev: associated net_device
 */
struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *snic,
				       struct net_device *ndev)
{
	struct cxgb3i_hba *hba;
	struct Scsi_Host *shost;
	int err;

	shost = iscsi_host_alloc(&cxgb3i_host_template,
				 sizeof(struct cxgb3i_hba),
				 CXGB3I_SCSI_QDEPTH_DFLT);
	if (!shost) {
		cxgb3i_log_info("iscsi_host_alloc failed.\n");
		return NULL;
	}

	shost->transportt = cxgb3i_scsi_transport;
	shost->max_lun = CXGB3I_MAX_LUN;
	shost->max_id = CXGB3I_MAX_TARGET;
	shost->max_channel = 0;
	shost->max_cmd_len = 16;

	hba = iscsi_host_priv(shost);
	hba->snic = snic