f62d0896e6
Need to make sure the outgoing pdu can fit into a single skb. When calulating the max. outgoing pdu payload size, take into consideration of - data can be held in the skb's fragment list, assume 512 bytes per fragment, and - data can be held in the headroom. Signed-off-by: Karen Xie <kxie@chelsio.com> Reviewed-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
947 lines
25 KiB
C
947 lines
25 KiB
C
/* cxgb3i_iscsi.c: Chelsio S3xx iSCSI driver.
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*
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* Copyright (c) 2008 Chelsio Communications, Inc.
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* Copyright (c) 2008 Mike Christie
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* Copyright (c) 2008 Red Hat, Inc. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation.
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*
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* Written by: Karen Xie (kxie@chelsio.com)
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*/
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#include <linux/inet.h>
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#include <linux/crypto.h>
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#include <net/tcp.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi.h>
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#include <scsi/iscsi_proto.h>
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#include <scsi/libiscsi.h>
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#include <scsi/scsi_transport_iscsi.h>
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#include "cxgb3i.h"
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#include "cxgb3i_pdu.h"
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#ifdef __DEBUG_CXGB3I_TAG__
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#define cxgb3i_tag_debug cxgb3i_log_debug
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#else
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#define cxgb3i_tag_debug(fmt...)
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#endif
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#ifdef __DEBUG_CXGB3I_API__
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#define cxgb3i_api_debug cxgb3i_log_debug
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#else
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#define cxgb3i_api_debug(fmt...)
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#endif
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/*
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* align pdu size to multiple of 512 for better performance
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*/
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#define align_pdu_size(n) do { n = (n) & (~511); } while (0)
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static struct scsi_transport_template *cxgb3i_scsi_transport;
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static struct scsi_host_template cxgb3i_host_template;
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static struct iscsi_transport cxgb3i_iscsi_transport;
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static unsigned char sw_tag_idx_bits;
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static unsigned char sw_tag_age_bits;
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static LIST_HEAD(cxgb3i_snic_list);
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static DEFINE_RWLOCK(cxgb3i_snic_rwlock);
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/**
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* cxgb3i_adapter_add - init a s3 adapter structure and any h/w settings
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* @t3dev: t3cdev adapter
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* return the resulting cxgb3i_adapter struct
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*/
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struct cxgb3i_adapter *cxgb3i_adapter_add(struct t3cdev *t3dev)
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{
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struct cxgb3i_adapter *snic;
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struct adapter *adapter = tdev2adap(t3dev);
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int i;
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snic = kzalloc(sizeof(*snic), GFP_KERNEL);
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if (!snic) {
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cxgb3i_api_debug("cxgb3 %s, OOM.\n", t3dev->name);
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return NULL;
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}
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spin_lock_init(&snic->lock);
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snic->tdev = t3dev;
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snic->pdev = adapter->pdev;
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snic->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
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if (cxgb3i_adapter_ddp_init(t3dev, &snic->tag_format,
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&snic->tx_max_size,
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&snic->rx_max_size) < 0)
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goto free_snic;
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for_each_port(adapter, i) {
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snic->hba[i] = cxgb3i_hba_host_add(snic, adapter->port[i]);
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if (!snic->hba[i])
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goto ulp_cleanup;
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}
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snic->hba_cnt = adapter->params.nports;
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/* add to the list */
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write_lock(&cxgb3i_snic_rwlock);
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list_add_tail(&snic->list_head, &cxgb3i_snic_list);
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write_unlock(&cxgb3i_snic_rwlock);
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return snic;
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ulp_cleanup:
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cxgb3i_adapter_ddp_cleanup(t3dev);
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free_snic:
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kfree(snic);
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return NULL;
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}
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/**
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* cxgb3i_adapter_remove - release all the resources held and cleanup any
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* h/w settings
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* @t3dev: t3cdev adapter
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*/
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void cxgb3i_adapter_remove(struct t3cdev *t3dev)
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{
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int i;
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struct cxgb3i_adapter *snic;
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/* remove from the list */
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write_lock(&cxgb3i_snic_rwlock);
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list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
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if (snic->tdev == t3dev) {
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list_del(&snic->list_head);
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break;
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}
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}
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write_unlock(&cxgb3i_snic_rwlock);
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if (snic) {
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for (i = 0; i < snic->hba_cnt; i++) {
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if (snic->hba[i]) {
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cxgb3i_hba_host_remove(snic->hba[i]);
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snic->hba[i] = NULL;
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}
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}
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/* release ddp resources */
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cxgb3i_adapter_ddp_cleanup(snic->tdev);
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kfree(snic);
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}
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}
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/**
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* cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure with a given
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* net_device
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* @t3dev: t3cdev adapter
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*/
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struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev)
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{
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struct cxgb3i_adapter *snic;
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int i;
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read_lock(&cxgb3i_snic_rwlock);
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list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
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for (i = 0; i < snic->hba_cnt; i++) {
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if (snic->hba[i]->ndev == ndev) {
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read_unlock(&cxgb3i_snic_rwlock);
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return snic->hba[i];
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}
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}
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}
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read_unlock(&cxgb3i_snic_rwlock);
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return NULL;
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}
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/**
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* cxgb3i_hba_host_add - register a new host with scsi/iscsi
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* @snic: the cxgb3i adapter
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* @ndev: associated net_device
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*/
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struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *snic,
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struct net_device *ndev)
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{
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struct cxgb3i_hba *hba;
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struct Scsi_Host *shost;
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int err;
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shost = iscsi_host_alloc(&cxgb3i_host_template,
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sizeof(struct cxgb3i_hba),
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CXGB3I_SCSI_QDEPTH_DFLT);
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if (!shost) {
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cxgb3i_log_info("iscsi_host_alloc failed.\n");
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return NULL;
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}
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shost->transportt = cxgb3i_scsi_transport;
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shost->max_lun = CXGB3I_MAX_LUN;
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shost->max_id = CXGB3I_MAX_TARGET;
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shost->max_channel = 0;
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shost->max_cmd_len = 16;
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hba = iscsi_host_priv(shost);
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hba->snic = snic;
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hba->ndev = ndev;
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hba->shost = shost;
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pci_dev_get(snic->pdev);
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err = iscsi_host_add(shost, &snic->pdev->dev);
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if (err) {
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cxgb3i_log_info("iscsi_host_add failed.\n");
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goto pci_dev_put;
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}
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cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
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shost, hba, shost->host_no);
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return hba;
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pci_dev_put:
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pci_dev_put(snic->pdev);
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scsi_host_put(shost);
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return NULL;
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}
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/**
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* cxgb3i_hba_host_remove - de-register the host with scsi/iscsi
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* @hba: the cxgb3i hba
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*/
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void cxgb3i_hba_host_remove(struct cxgb3i_hba *hba)
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{
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cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
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hba->shost, hba, hba->shost->host_no);
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iscsi_host_remove(hba->shost);
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pci_dev_put(hba->snic->pdev);
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iscsi_host_free(hba->shost);
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}
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/**
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* cxgb3i_ep_connect - establish TCP connection to target portal
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* @dst_addr: target IP address
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* @non_blocking: blocking or non-blocking call
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*
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* Initiates a TCP/IP connection to the dst_addr
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*/
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static struct iscsi_endpoint *cxgb3i_ep_connect(struct sockaddr *dst_addr,
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int non_blocking)
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{
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struct iscsi_endpoint *ep;
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struct cxgb3i_endpoint *cep;
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struct cxgb3i_hba *hba;
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struct s3_conn *c3cn = NULL;
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int err = 0;
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c3cn = cxgb3i_c3cn_create();
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if (!c3cn) {
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cxgb3i_log_info("ep connect OOM.\n");
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err = -ENOMEM;
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goto release_conn;
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}
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err = cxgb3i_c3cn_connect(c3cn, (struct sockaddr_in *)dst_addr);
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if (err < 0) {
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cxgb3i_log_info("ep connect failed.\n");
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goto release_conn;
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}
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hba = cxgb3i_hba_find_by_netdev(c3cn->dst_cache->dev);
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if (!hba) {
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err = -ENOSPC;
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cxgb3i_log_info("NOT going through cxgbi device.\n");
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goto release_conn;
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}
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if (c3cn_is_closing(c3cn)) {
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err = -ENOSPC;
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cxgb3i_log_info("ep connect unable to connect.\n");
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goto release_conn;
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}
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ep = iscsi_create_endpoint(sizeof(*cep));
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if (!ep) {
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err = -ENOMEM;
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cxgb3i_log_info("iscsi alloc ep, OOM.\n");
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goto release_conn;
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}
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cep = ep->dd_data;
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cep->c3cn = c3cn;
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cep->hba = hba;
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cxgb3i_api_debug("ep 0x%p, 0x%p, c3cn 0x%p, hba 0x%p.\n",
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ep, cep, c3cn, hba);
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return ep;
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release_conn:
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cxgb3i_api_debug("conn 0x%p failed, release.\n", c3cn);
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if (c3cn)
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cxgb3i_c3cn_release(c3cn);
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return ERR_PTR(err);
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}
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/**
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* cxgb3i_ep_poll - polls for TCP connection establishement
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* @ep: TCP connection (endpoint) handle
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* @timeout_ms: timeout value in milli secs
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*
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* polls for TCP connect request to complete
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*/
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static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
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{
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struct cxgb3i_endpoint *cep = ep->dd_data;
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struct s3_conn *c3cn = cep->c3cn;
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if (!c3cn_is_established(c3cn))
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return 0;
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cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn);
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return 1;
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}
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/**
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* cxgb3i_ep_disconnect - teardown TCP connection
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* @ep: TCP connection (endpoint) handle
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*
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* teardown TCP connection
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*/
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static void cxgb3i_ep_disconnect(struct iscsi_endpoint *ep)
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{
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struct cxgb3i_endpoint *cep = ep->dd_data;
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struct cxgb3i_conn *cconn = cep->cconn;
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cxgb3i_api_debug("ep 0x%p, cep 0x%p.\n", ep, cep);
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if (cconn && cconn->conn) {
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/*
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* stop the xmit path so the xmit_pdu function is
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* not being called
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*/
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iscsi_suspend_tx(cconn->conn);
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write_lock_bh(&cep->c3cn->callback_lock);
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cep->c3cn->user_data = NULL;
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cconn->cep = NULL;
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write_unlock_bh(&cep->c3cn->callback_lock);
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}
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cxgb3i_api_debug("ep 0x%p, cep 0x%p, release c3cn 0x%p.\n",
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ep, cep, cep->c3cn);
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cxgb3i_c3cn_release(cep->c3cn);
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iscsi_destroy_endpoint(ep);
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}
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/**
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* cxgb3i_session_create - create a new iscsi session
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* @cmds_max: max # of commands
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* @qdepth: scsi queue depth
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* @initial_cmdsn: initial iscsi CMDSN for this session
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* @host_no: pointer to return host no
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*
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* Creates a new iSCSI session
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*/
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static struct iscsi_cls_session *
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cxgb3i_session_create(struct iscsi_endpoint *ep, u16 cmds_max, u16 qdepth,
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u32 initial_cmdsn, u32 *host_no)
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{
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struct cxgb3i_endpoint *cep;
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struct cxgb3i_hba *hba;
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struct Scsi_Host *shost;
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struct iscsi_cls_session *cls_session;
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struct iscsi_session *session;
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if (!ep) {
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cxgb3i_log_error("%s, missing endpoint.\n", __func__);
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return NULL;
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}
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cep = ep->dd_data;
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hba = cep->hba;
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shost = hba->shost;
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cxgb3i_api_debug("ep 0x%p, cep 0x%p, hba 0x%p.\n", ep, cep, hba);
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BUG_ON(hba != iscsi_host_priv(shost));
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*host_no = shost->host_no;
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cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost,
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cmds_max,
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sizeof(struct iscsi_tcp_task) +
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sizeof(struct cxgb3i_task_data),
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initial_cmdsn, ISCSI_MAX_TARGET);
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if (!cls_session)
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return NULL;
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session = cls_session->dd_data;
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if (iscsi_tcp_r2tpool_alloc(session))
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goto remove_session;
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return cls_session;
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remove_session:
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iscsi_session_teardown(cls_session);
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return NULL;
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}
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|
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/**
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* cxgb3i_session_destroy - destroys iscsi session
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* @cls_session: pointer to iscsi cls session
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*
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* Destroys an iSCSI session instance and releases its all resources held
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*/
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static void cxgb3i_session_destroy(struct iscsi_cls_session *cls_session)
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{
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cxgb3i_api_debug("sess 0x%p.\n", cls_session);
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iscsi_tcp_r2tpool_free(cls_session->dd_data);
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iscsi_session_teardown(cls_session);
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}
|
|
|
|
/**
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* cxgb3i_conn_max_xmit_dlength -- check the max. xmit pdu segment size,
|
|
* reduce it to be within the hardware limit if needed
|
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* @conn: iscsi connection
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*/
|
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static inline int cxgb3i_conn_max_xmit_dlength(struct iscsi_conn *conn)
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|
|
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{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
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struct cxgb3i_conn *cconn = tcp_conn->dd_data;
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unsigned int max = max(512 * MAX_SKB_FRAGS, SKB_TX_HEADROOM);
|
|
|
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max = min(cconn->hba->snic->tx_max_size, max);
|
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if (conn->max_xmit_dlength)
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conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
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else
|
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conn->max_xmit_dlength = max;
|
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align_pdu_size(conn->max_xmit_dlength);
|
|
cxgb3i_api_debug("conn 0x%p, max xmit %u.\n",
|
|
conn, conn->max_xmit_dlength);
|
|
return 0;
|
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}
|
|
|
|
/**
|
|
* cxgb3i_conn_max_recv_dlength -- check the max. recv pdu segment size against
|
|
* the hardware limit
|
|
* @conn: iscsi connection
|
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* return 0 if the value is valid, < 0 otherwise.
|
|
*/
|
|
static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
|
|
unsigned int max = cconn->hba->snic->rx_max_size;
|
|
|
|
align_pdu_size(max);
|
|
if (conn->max_recv_dlength) {
|
|
if (conn->max_recv_dlength > max) {
|
|
cxgb3i_log_error("MaxRecvDataSegmentLength %u too big."
|
|
" Need to be <= %u.\n",
|
|
conn->max_recv_dlength, max);
|
|
return -EINVAL;
|
|
}
|
|
conn->max_recv_dlength = min(conn->max_recv_dlength, max);
|
|
align_pdu_size(conn->max_recv_dlength);
|
|
} else
|
|
conn->max_recv_dlength = max;
|
|
cxgb3i_api_debug("conn 0x%p, max recv %u.\n",
|
|
conn, conn->max_recv_dlength);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* cxgb3i_conn_create - create iscsi connection instance
|
|
* @cls_session: pointer to iscsi cls session
|
|
* @cid: iscsi cid
|
|
*
|
|
* Creates a new iSCSI connection instance for a given session
|
|
*/
|
|
static struct iscsi_cls_conn *cxgb3i_conn_create(struct iscsi_cls_session
|
|
*cls_session, u32 cid)
|
|
{
|
|
struct iscsi_cls_conn *cls_conn;
|
|
struct iscsi_conn *conn;
|
|
struct iscsi_tcp_conn *tcp_conn;
|
|
struct cxgb3i_conn *cconn;
|
|
|
|
cxgb3i_api_debug("sess 0x%p, cid %u.\n", cls_session, cid);
|
|
|
|
cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
|
|
if (!cls_conn)
|
|
return NULL;
|
|
conn = cls_conn->dd_data;
|
|
tcp_conn = conn->dd_data;
|
|
cconn = tcp_conn->dd_data;
|
|
|
|
cconn->conn = conn;
|
|
return cls_conn;
|
|
}
|
|
|
|
/**
|
|
* cxgb3i_conn_bind - binds iscsi sess, conn and endpoint together
|
|
* @cls_session: pointer to iscsi cls session
|
|
* @cls_conn: pointer to iscsi cls conn
|
|
* @transport_eph: 64-bit EP handle
|
|
* @is_leading: leading connection on this session?
|
|
*
|
|
* Binds together an iSCSI session, an iSCSI connection and a
|
|
* TCP connection. This routine returns error code if the TCP
|
|
* connection does not belong on the device iSCSI sess/conn is bound
|
|
*/
|
|
|
|
static int cxgb3i_conn_bind(struct iscsi_cls_session *cls_session,
|
|
struct iscsi_cls_conn *cls_conn,
|
|
u64 transport_eph, int is_leading)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
|
|
struct cxgb3i_adapter *snic;
|
|
struct iscsi_endpoint *ep;
|
|
struct cxgb3i_endpoint *cep;
|
|
struct s3_conn *c3cn;
|
|
int err;
|
|
|
|
ep = iscsi_lookup_endpoint(transport_eph);
|
|
if (!ep)
|
|
return -EINVAL;
|
|
|
|
/* setup ddp pagesize */
|
|
cep = ep->dd_data;
|
|
c3cn = cep->c3cn;
|
|
snic = cep->hba->snic;
|
|
err = cxgb3i_setup_conn_host_pagesize(snic->tdev, c3cn->tid, 0);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
cxgb3i_api_debug("ep 0x%p, cls sess 0x%p, cls conn 0x%p.\n",
|
|
ep, cls_session, cls_conn);
|
|
|
|
err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
|
|
if (err)
|
|
return -EINVAL;
|
|
|
|
/* calculate the tag idx bits needed for this conn based on cmds_max */
|
|
cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
|
|
cxgb3i_api_debug("session cmds_max 0x%x, bits %u.\n",
|
|
conn->session->cmds_max, cconn->task_idx_bits);
|
|
|
|
read_lock(&c3cn->callback_lock);
|
|
c3cn->user_data = conn;
|
|
cconn->hba = cep->hba;
|
|
cconn->cep = cep;
|
|
cep->cconn = cconn;
|
|
read_unlock(&c3cn->callback_lock);
|
|
|
|
cxgb3i_conn_max_xmit_dlength(conn);
|
|
cxgb3i_conn_max_recv_dlength(conn);
|
|
|
|
spin_lock_bh(&conn->session->lock);
|
|
sprintf(conn->portal_address, NIPQUAD_FMT,
|
|
NIPQUAD(c3cn->daddr.sin_addr.s_addr));
|
|
conn->portal_port = ntohs(c3cn->daddr.sin_port);
|
|
spin_unlock_bh(&conn->session->lock);
|
|
|
|
/* init recv engine */
|
|
iscsi_tcp_hdr_recv_prep(tcp_conn);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* cxgb3i_conn_get_param - return iscsi connection parameter to caller
|
|
* @cls_conn: pointer to iscsi cls conn
|
|
* @param: parameter type identifier
|
|
* @buf: buffer pointer
|
|
*
|
|
* returns iSCSI connection parameters
|
|
*/
|
|
static int cxgb3i_conn_get_param(struct iscsi_cls_conn *cls_conn,
|
|
enum iscsi_param param, char *buf)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
int len;
|
|
|
|
cxgb3i_api_debug("cls_conn 0x%p, param %d.\n", cls_conn, param);
|
|
|
|
switch (param) {
|
|
case ISCSI_PARAM_CONN_PORT:
|
|
spin_lock_bh(&conn->session->lock);
|
|
len = sprintf(buf, "%hu\n", conn->portal_port);
|
|
spin_unlock_bh(&conn->session->lock);
|
|
break;
|
|
case ISCSI_PARAM_CONN_ADDRESS:
|
|
spin_lock_bh(&conn->session->lock);
|
|
len = sprintf(buf, "%s\n", conn->portal_address);
|
|
spin_unlock_bh(&conn->session->lock);
|
|
break;
|
|
default:
|
|
return iscsi_conn_get_param(cls_conn, param, buf);
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
/**
|
|
* cxgb3i_conn_set_param - set iscsi connection parameter
|
|
* @cls_conn: pointer to iscsi cls conn
|
|
* @param: parameter type identifier
|
|
* @buf: buffer pointer
|
|
* @buflen: buffer length
|
|
*
|
|
* set iSCSI connection parameters
|
|
*/
|
|
static int cxgb3i_conn_set_param(struct iscsi_cls_conn *cls_conn,
|
|
enum iscsi_param param, char *buf, int buflen)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_session *session = conn->session;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
|
|
struct cxgb3i_adapter *snic = cconn->hba->snic;
|
|
struct s3_conn *c3cn = cconn->cep->c3cn;
|
|
int value, err = 0;
|
|
|
|
switch (param) {
|
|
case ISCSI_PARAM_HDRDGST_EN:
|
|
err = iscsi_set_param(cls_conn, param, buf, buflen);
|
|
if (!err && conn->hdrdgst_en)
|
|
err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
|
|
conn->hdrdgst_en,
|
|
conn->datadgst_en, 0);
|
|
break;
|
|
case ISCSI_PARAM_DATADGST_EN:
|
|
err = iscsi_set_param(cls_conn, param, buf, buflen);
|
|
if (!err && conn->datadgst_en)
|
|
err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
|
|
conn->hdrdgst_en,
|
|
conn->datadgst_en, 0);
|
|
break;
|
|
case ISCSI_PARAM_MAX_R2T:
|
|
sscanf(buf, "%d", &value);
|
|
if (value <= 0 || !is_power_of_2(value))
|
|
return -EINVAL;
|
|
if (session->max_r2t == value)
|
|
break;
|
|
iscsi_tcp_r2tpool_free(session);
|
|
err = iscsi_set_param(cls_conn, param, buf, buflen);
|
|
if (!err && iscsi_tcp_r2tpool_alloc(session))
|
|
return -ENOMEM;
|
|
case ISCSI_PARAM_MAX_RECV_DLENGTH:
|
|
err = iscsi_set_param(cls_conn, param, buf, buflen);
|
|
if (!err)
|
|
err = cxgb3i_conn_max_recv_dlength(conn);
|
|
break;
|
|
case ISCSI_PARAM_MAX_XMIT_DLENGTH:
|
|
err = iscsi_set_param(cls_conn, param, buf, buflen);
|
|
if (!err)
|
|
err = cxgb3i_conn_max_xmit_dlength(conn);
|
|
break;
|
|
default:
|
|
return iscsi_set_param(cls_conn, param, buf, buflen);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* cxgb3i_host_set_param - configure host (adapter) related parameters
|
|
* @shost: scsi host pointer
|
|
* @param: parameter type identifier
|
|
* @buf: buffer pointer
|
|
*/
|
|
static int cxgb3i_host_set_param(struct Scsi_Host *shost,
|
|
enum iscsi_host_param param,
|
|
char *buf, int buflen)
|
|
{
|
|
struct cxgb3i_hba *hba = iscsi_host_priv(shost);
|
|
|
|
cxgb3i_api_debug("param %d, buf %s.\n", param, buf);
|
|
|
|
switch (param) {
|
|
case ISCSI_HOST_PARAM_IPADDRESS:
|
|
{
|
|
__be32 addr = in_aton(buf);
|
|
cxgb3i_set_private_ipv4addr(hba->ndev, addr);
|
|
return 0;
|
|
}
|
|
case ISCSI_HOST_PARAM_HWADDRESS:
|
|
case ISCSI_HOST_PARAM_NETDEV_NAME:
|
|
/* ignore */
|
|
return 0;
|
|
default:
|
|
return iscsi_host_set_param(shost, param, buf, buflen);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* cxgb3i_host_get_param - returns host (adapter) related parameters
|
|
* @shost: scsi host pointer
|
|
* @param: parameter type identifier
|
|
* @buf: buffer pointer
|
|
*/
|
|
static int cxgb3i_host_get_param(struct Scsi_Host *shost,
|
|
enum iscsi_host_param param, char *buf)
|
|
{
|
|
struct cxgb3i_hba *hba = iscsi_host_priv(shost);
|
|
int len = 0;
|
|
|
|
cxgb3i_api_debug("hba %s, param %d.\n", hba->ndev->name, param);
|
|
|
|
switch (param) {
|
|
case ISCSI_HOST_PARAM_HWADDRESS:
|
|
len = sysfs_format_mac(buf, hba->ndev->dev_addr, 6);
|
|
break;
|
|
case ISCSI_HOST_PARAM_NETDEV_NAME:
|
|
len = sprintf(buf, "%s\n", hba->ndev->name);
|
|
break;
|
|
case ISCSI_HOST_PARAM_IPADDRESS:
|
|
{
|
|
__be32 addr;
|
|
|
|
addr = cxgb3i_get_private_ipv4addr(hba->ndev);
|
|
len = sprintf(buf, NIPQUAD_FMT, NIPQUAD(addr));
|
|
break;
|
|
}
|
|
default:
|
|
return iscsi_host_get_param(shost, param, buf);
|
|
}
|
|
return len;
|
|
}
|
|
|
|
/**
|
|
* cxgb3i_conn_get_stats - returns iSCSI stats
|
|
* @cls_conn: pointer to iscsi cls conn
|
|
* @stats: pointer to iscsi statistic struct
|
|
*/
|
|
static void cxgb3i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
|
|
struct iscsi_stats *stats)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
|
|
stats->txdata_octets = conn->txdata_octets;
|
|
stats->rxdata_octets = conn->rxdata_octets;
|
|
stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
|
|
stats->dataout_pdus = conn->dataout_pdus_cnt;
|
|
stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
|
|
stats->datain_pdus = conn->datain_pdus_cnt;
|
|
stats->r2t_pdus = conn->r2t_pdus_cnt;
|
|
stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
|
|
stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
|
|
stats->digest_err = 0;
|
|
stats->timeout_err = 0;
|
|
stats->custom_length = 1;
|
|
strcpy(stats->custom[0].desc, "eh_abort_cnt");
|
|
stats->custom[0].value = conn->eh_abort_cnt;
|
|
}
|
|
|
|
/**
|
|
* cxgb3i_parse_itt - get the idx and age bits from a given tag
|
|
* @conn: iscsi connection
|
|
* @itt: itt tag
|
|
* @idx: task index, filled in by this function
|
|
* @age: session age, filled in by this function
|
|
*/
|
|
static void cxgb3i_parse_itt(struct iscsi_conn *conn, itt_t itt,
|
|
int *idx, int *age)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
|
|
struct cxgb3i_adapter *snic = cconn->hba->snic;
|
|
u32 tag = ntohl((__force u32) itt);
|
|
u32 sw_bits;
|
|
|
|
sw_bits = cxgb3i_tag_nonrsvd_bits(&snic->tag_format, tag);
|
|
if (idx)
|
|
*idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
|
|
if (age)
|
|
*age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
|
|
|
|
cxgb3i_tag_debug("parse tag 0x%x/0x%x, sw 0x%x, itt 0x%x, age 0x%x.\n",
|
|
tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
|
|
age ? *age : 0xFF);
|
|
}
|
|
|
|
/**
|
|
* cxgb3i_reserve_itt - generate tag for a give task
|
|
* Try to set up ddp for a scsi read task.
|
|
* @task: iscsi task
|
|
* @hdr_itt: tag, filled in by this function
|
|
*/
|
|
int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
|
|
{
|
|
struct scsi_cmnd *sc = task->sc;
|
|
struct iscsi_conn *conn = task->conn;
|
|
struct iscsi_session *sess = conn->session;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
|
|
struct cxgb3i_adapter *snic = cconn->hba->snic;
|
|
struct cxgb3i_tag_format *tformat = &snic->tag_format;
|
|
u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
|
|
u32 tag;
|
|
int err = -EINVAL;
|
|
|
|
if (sc &&
|
|
(scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
|
|
cxgb3i_sw_tag_usable(tformat, sw_tag)) {
|
|
struct s3_conn *c3cn = cconn->cep->c3cn;
|
|
struct cxgb3i_gather_list *gl;
|
|
|
|
gl = cxgb3i_ddp_make_gl(scsi_in(sc)->length,
|
|
scsi_in(sc)->table.sgl,
|
|
scsi_in(sc)->table.nents,
|
|
snic->pdev,
|
|
GFP_ATOMIC);
|
|
if (gl) {
|
|
tag = sw_tag;
|
|
err = cxgb3i_ddp_tag_reserve(snic->tdev, c3cn->tid,
|
|
tformat, &tag,
|
|
gl, GFP_ATOMIC);
|
|
if (err < 0)
|
|
cxgb3i_ddp_release_gl(gl, snic->pdev);
|
|
}
|
|
}
|
|
|
|
if (err < 0)
|
|
tag = cxgb3i_set_non_ddp_tag(tformat, sw_tag);
|
|
/* the itt need to sent in big-endian order */
|
|
*hdr_itt = (__force itt_t)htonl(tag);
|
|
|
|
cxgb3i_tag_debug("new tag 0x%x/0x%x (itt 0x%x, age 0x%x).\n",
|
|
tag, *hdr_itt, task->itt, sess->age);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* cxgb3i_release_itt - release the tag for a given task
|
|
* if the tag is a ddp tag, release the ddp setup
|
|
* @task: iscsi task
|
|
* @hdr_itt: tag
|
|
*/
|
|
void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt)
|
|
{
|
|
struct scsi_cmnd *sc = task->sc;
|
|
struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
|
|
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
|
|
struct cxgb3i_adapter *snic = cconn->hba->snic;
|
|
struct cxgb3i_tag_format *tformat = &snic->tag_format;
|
|
u32 tag = ntohl((__force u32)hdr_itt);
|
|
|
|
cxgb3i_tag_debug("release tag 0x%x.\n", tag);
|
|
|
|
if (sc &&
|
|
(scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
|
|
cxgb3i_is_ddp_tag(tformat, tag))
|
|
cxgb3i_ddp_tag_release(snic->tdev, tag);
|
|
}
|
|
|
|
/**
|
|
* cxgb3i_host_template -- Scsi_Host_Template structure
|
|
* used when registering with the scsi mid layer
|
|
*/
|
|
static struct scsi_host_template cxgb3i_host_template = {
|
|
.module = THIS_MODULE,
|
|
.name = "Chelsio S3xx iSCSI Initiator",
|
|
.proc_name = "cxgb3i",
|
|
.queuecommand = iscsi_queuecommand,
|
|
.change_queue_depth = iscsi_change_queue_depth,
|
|
.can_queue = CXGB3I_SCSI_QDEPTH_DFLT - 1,
|
|
.sg_tablesize = SG_ALL,
|
|
.max_sectors = 0xFFFF,
|
|
.cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
|
|
.eh_abort_handler = iscsi_eh_abort,
|
|
.eh_device_reset_handler = iscsi_eh_device_reset,
|
|
.eh_target_reset_handler = iscsi_eh_target_reset,
|
|
.use_clustering = DISABLE_CLUSTERING,
|
|
.this_id = -1,
|
|
};
|
|
|
|
static struct iscsi_transport cxgb3i_iscsi_transport = {
|
|
.owner = THIS_MODULE,
|
|
.name = "cxgb3i",
|
|
.caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
|
|
| CAP_DATADGST | CAP_DIGEST_OFFLOAD |
|
|
CAP_PADDING_OFFLOAD,
|
|
.param_mask = ISCSI_MAX_RECV_DLENGTH |
|
|
ISCSI_MAX_XMIT_DLENGTH |
|
|
ISCSI_HDRDGST_EN |
|
|
ISCSI_DATADGST_EN |
|
|
ISCSI_INITIAL_R2T_EN |
|
|
ISCSI_MAX_R2T |
|
|
ISCSI_IMM_DATA_EN |
|
|
ISCSI_FIRST_BURST |
|
|
ISCSI_MAX_BURST |
|
|
ISCSI_PDU_INORDER_EN |
|
|
ISCSI_DATASEQ_INORDER_EN |
|
|
ISCSI_ERL |
|
|
ISCSI_CONN_PORT |
|
|
ISCSI_CONN_ADDRESS |
|
|
ISCSI_EXP_STATSN |
|
|
ISCSI_PERSISTENT_PORT |
|
|
ISCSI_PERSISTENT_ADDRESS |
|
|
ISCSI_TARGET_NAME | ISCSI_TPGT |
|
|
ISCSI_USERNAME | ISCSI_PASSWORD |
|
|
ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
|
|
ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
|
|
ISCSI_LU_RESET_TMO |
|
|
ISCSI_PING_TMO | ISCSI_RECV_TMO |
|
|
ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
|
|
.host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
|
|
ISCSI_HOST_INITIATOR_NAME | ISCSI_HOST_NETDEV_NAME,
|
|
.get_host_param = cxgb3i_host_get_param,
|
|
.set_host_param = cxgb3i_host_set_param,
|
|
/* session management */
|
|
.create_session = cxgb3i_session_create,
|
|
.destroy_session = cxgb3i_session_destroy,
|
|
.get_session_param = iscsi_session_get_param,
|
|
/* connection management */
|
|
.create_conn = cxgb3i_conn_create,
|
|
.bind_conn = cxgb3i_conn_bind,
|
|
.destroy_conn = iscsi_tcp_conn_teardown,
|
|
.start_conn = iscsi_conn_start,
|
|
.stop_conn = iscsi_conn_stop,
|
|
.get_conn_param = cxgb3i_conn_get_param,
|
|
.set_param = cxgb3i_conn_set_param,
|
|
.get_stats = cxgb3i_conn_get_stats,
|
|
/* pdu xmit req. from user space */
|
|
.send_pdu = iscsi_conn_send_pdu,
|
|
/* task */
|
|
.init_task = iscsi_tcp_task_init,
|
|
.xmit_task = iscsi_tcp_task_xmit,
|
|
.cleanup_task = cxgb3i_conn_cleanup_task,
|
|
|
|
/* pdu */
|
|
.alloc_pdu = cxgb3i_conn_alloc_pdu,
|
|
.init_pdu = cxgb3i_conn_init_pdu,
|
|
.xmit_pdu = cxgb3i_conn_xmit_pdu,
|
|
.parse_pdu_itt = cxgb3i_parse_itt,
|
|
|
|
/* TCP connect/disconnect */
|
|
.ep_connect = cxgb3i_ep_connect,
|
|
.ep_poll = cxgb3i_ep_poll,
|
|
.ep_disconnect = cxgb3i_ep_disconnect,
|
|
/* Error recovery timeout call */
|
|
.session_recovery_timedout = iscsi_session_recovery_timedout,
|
|
};
|
|
|
|
int cxgb3i_iscsi_init(void)
|
|
{
|
|
sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
|
|
sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
|
|
cxgb3i_log_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
|
|
ISCSI_ITT_MASK, sw_tag_idx_bits,
|
|
ISCSI_AGE_MASK, sw_tag_age_bits);
|
|
|
|
cxgb3i_scsi_transport =
|
|
iscsi_register_transport(&cxgb3i_iscsi_transport);
|
|
if (!cxgb3i_scsi_transport) {
|
|
cxgb3i_log_error("Could not register cxgb3i transport.\n");
|
|
return -ENODEV;
|
|
}
|
|
cxgb3i_api_debug("cxgb3i transport 0x%p.\n", cxgb3i_scsi_transport);
|
|
return 0;
|
|
}
|
|
|
|
void cxgb3i_iscsi_cleanup(void)
|
|
{
|
|
if (cxgb3i_scsi_transport) {
|
|
cxgb3i_api_debug("cxgb3i transport 0x%p.\n",
|
|
cxgb3i_scsi_transport);
|
|
iscsi_unregister_transport(&cxgb3i_iscsi_transport);
|
|
}
|
|
}
|