/* 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 #include #include #include #include #include #include #include #include #include #include #include #include #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_adpater_find_by_tdev - find the cxgb3i_adapter structure via t3cdev * @tdev: t3cdev pointer */ struct cxgb3i_adapter *cxgb3i_adapter_find_by_tdev(struct t3cdev *tdev) { struct cxgb3i_adapter *snic; read_lock(&cxgb3i_snic_rwlock); list_for_each_entry(snic, &cxgb3i_snic_list, list_head) { if (snic->tdev == tdev) { read_unlock(&cxgb3i_snic_rwlock); return snic; } } read_unlock(&cxgb3i_snic_rwlock); return NULL; } static inline int adapter_update(struct cxgb3i_adapter *snic) { cxgb3i_log_info("snic 0x%p, t3dev 0x%p, updating.\n", snic, snic->tdev); return cxgb3i_adapter_ddp_info(snic->tdev, &snic->tag_format, &snic->tx_max_size, &snic->rx_max_size); } static int adapter_add(struct cxgb3i_adapter *snic) { struct t3cdev *t3dev = snic->tdev; struct adapter *adapter = tdev2adap(t3dev); int i, err; snic->pdev = adapter->pdev; snic->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits; err = cxgb3i_adapter_ddp_info(t3dev, &snic->tag_format, &snic->tx_max_size, &snic->rx_max_size); if (err < 0) return err; for_each_port(adapter, i) { snic->hba[i] = cxgb3i_hba_host_add(snic, adapter->port[i]); if (!snic->hba[i]) return -EINVAL; } 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); cxgb3i_log_info("t3dev 0x%p open, snic 0x%p, %u scsi hosts added.\n", t3dev, snic, snic->hba_cnt); return 0; } /** * cxgb3i_adapter_open - init a s3 adapter structure and any h/w settings * @t3dev: t3cdev adapter */ void cxgb3i_adapter_open(struct t3cdev *t3dev) { struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(t3dev); int err; if (snic) err = adapter_update(snic); else { snic = kzalloc(sizeof(*snic), GFP_KERNEL); if (snic) { spin_lock_init(&snic->lock); snic->tdev = t3dev; err = adapter_add(snic); } else err = -ENOMEM; } if (err < 0) { cxgb3i_log_info("snic 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n", snic, snic ? snic->flags : 0, t3dev, err); if (snic) { snic->flags &= ~CXGB3I_ADAPTER_FLAG_RESET; cxgb3i_adapter_close(t3dev); } } } /** * cxgb3i_adapter_close - release the resources held and cleanup h/w settings * @t3dev: t3cdev adapter */ void cxgb3i_adapter_close(struct t3cdev *t3dev) { struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(t3dev); int i; if (!snic || snic->flags & CXGB3I_ADAPTER_FLAG_RESET) { cxgb3i_log_info("t3dev 0x%p close, snic 0x%p, f 0x%x.\n", t3dev, snic, snic ? snic->flags : 0); return; } /* remove from the list */ write_lock(&cxgb3i_snic_rwlock); list_del(&snic->list_head); write_unlock(&cxgb3i_snic_rwlock); for (i = 0; i < snic->hba_cnt; i++) { if (snic->hba[i]) { cxgb3i_hba_host_remove(snic->hba[i]); snic->hba[i] = NULL; } } cxgb3i_log_info("t3dev 0x%p close, snic 0x%p, %u scsi hosts removed.\n", t3dev, snic, snic->hba_cnt); kfree(snic); } /** * cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure via net_device * @t3dev: t3cdev adapter */ static struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev) { struct cxgb3i_adapter *snic; int i; if (ndev->priv_flags & IFF_802_1Q_VLAN) ndev = vlan_dev_real_dev(ndev); 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), 1); if (!shost) { cxgb3i_log_info("snic 0x%p, ndev 0x%p, host_alloc failed.\n", snic, ndev); 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; hba->ndev = ndev; hba->shost = shost; pci_dev_get(snic->pdev); err = iscsi_host_add(shost, &snic->pdev->dev); if (err) { cxgb3i_log_info("snic 0x%p, ndev 0x%p, host_add failed.\n", snic, ndev); goto pci_dev_put; } cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n", shost, hba, shost->host_no); return hba; pci_dev_put: pci_dev_put(snic->pdev); scsi_host_put(shost); return NULL; } /** * cxgb3i_hba_host_remove - de-register the host with scsi/iscsi * @hba: the cxgb3i hba */ void cxgb3i_hba_host_remove(struct cxgb3i_hba *hba) { cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n", hba->shost, hba, hba->shost->host_no); iscsi_host_remove(hba->shost); pci_dev_put(hba->snic->pdev); iscsi_host_free(hba->shost); } /** * cxgb3i_ep_connect - establish TCP connection to target portal * @shost: scsi host to use * @dst_addr: target IP address * @non_blocking: blocking or non-blocking call * * Initiates a TCP/IP connection to the dst_addr */ static struct iscsi_endpoint *cxgb3i_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, int non_blocking) { struct iscsi_endpoint *ep; struct cxgb3i_endpoint *cep; struct cxgb3i_hba *hba = NULL; struct s3_conn *c3cn = NULL; int err = 0; if (shost) hba = iscsi_host_priv(shost); cxgb3i_api_debug("shost 0x%p, hba 0x%p.\n", shost, hba); c3cn = cxgb3i_c3cn_create(); if (!c3cn) { cxgb3i_log_info("ep connect OOM.\n"); err = -ENOMEM; goto release_conn; } err = cxgb3i_c3cn_connect(hba ? hba->ndev : NULL, c3cn, (struct sockaddr_in *)dst_addr); if (err < 0) { cxgb3i_log_info("ep connect failed.\n"); goto release_conn; } hba = cxgb3i_hba_find_by_netdev(c3cn->dst_cache->dev); if (!hba) { err = -ENOSPC; cxgb3i_log_info("NOT going through cxgbi device.\n"); goto release_conn; } if (shost && hba != iscsi_host_priv(shost)) { err = -ENOSPC; cxgb3i_log_info("Could not connect through request host%u\n", shost->host_no); goto release_conn; } if (c3cn_is_closing(c3cn)) { err = -ENOSPC; cxgb3i_log_info("ep connect unable to connect.\n"); goto release_conn; } ep = iscsi_create_endpoint(sizeof(*cep)); if (!ep) { err = -ENOMEM; cxgb3i_log_info("iscsi alloc ep, OOM.\n"); goto release_conn; } cep = ep->dd_data; cep->c3cn = c3cn; cep->hba = hba; cxgb3i_api_debug("ep 0x%p, 0x%p, c3cn 0x%p, hba 0x%p.\n", ep, cep, c3cn, hba); return ep; release_conn: cxgb3i_api_debug("conn 0x%p failed, release.\n", c3cn); if (c3cn) cxgb3i_c3cn_release(c3cn); return ERR_PTR(err); } /** * cxgb3i_ep_poll - polls for TCP connection establishement * @ep: TCP connection (endpoint) handle * @timeout_ms: timeout value in milli secs * * polls for TCP connect request to complete */ static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) { struct cxgb3i_endpoint *cep = ep->dd_data; struct s3_conn *c3cn = cep->c3cn; if (!c3cn_is_established(c3cn)) return 0; cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn); return 1; } /** * cxgb3i_ep_disconnect - teardown TCP connection * @ep: TCP connection (endpoint) handle * * teardown TCP connection */ static void cxgb3i_ep_disconnect(struct iscsi_endpoint *ep) { struct cxgb3i_endpoint *cep = ep->dd_data; struct cxgb3i_conn *cconn = cep->cconn; cxgb3i_api_debug("ep 0x%p, cep 0x%p.\n", ep, cep); if (cconn && cconn->conn) { /* * stop the xmit path so the xmit_pdu function is * not being called */ iscsi_suspend_tx(cconn->conn); write_lock_bh(&cep->c3cn->callback_lock); cep->c3cn->user_data = NULL; cconn->cep = NULL; write_unlock_bh(&cep->c3cn->callback_lock); } cxgb3i_api_debug("ep 0x%p, cep 0x%p, release c3cn 0x%p.\n", ep, cep, cep->c3cn); cxgb3i_c3cn_release(cep->c3cn); iscsi_destroy_endpoint(ep); } /** * cxgb3i_session_create - create a new iscsi session * @cmds_max: max # of commands * @qdepth: scsi queue depth * @initial_cmdsn: initial iscsi CMDSN for this session * * Creates a new iSCSI session */ static struct iscsi_cls_session * cxgb3i_session_create(struct iscsi_endpoint *ep, u16 cmds_max, u16 qdepth, u32 initial_cmdsn) { struct cxgb3i_endpoint *cep; struct cxgb3i_hba *hba; struct Scsi_Host *shost; struct iscsi_cls_session *cls_session; struct iscsi_session *session; if (!ep) { cxgb3i_log_error("%s, missing endpoint.\n", __func__); return NULL; } cep = ep->dd_data; hba = cep->hba; shost = hba->shost; cxgb3i_api_debug("ep 0x%p, cep 0x%p, hba 0x%p.\n", ep, cep, hba); BUG_ON(hba != iscsi_host_priv(shost)); cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost, cmds_max, 0, sizeof(struct iscsi_tcp_task) + sizeof(struct cxgb3i_task_data), initial_cmdsn, ISCSI_MAX_TARGET); if (!cls_session) return NULL; session = cls_session->dd_data; if (iscsi_tcp_r2tpool_alloc(session)) goto remove_session; return cls_session; remove_session: iscsi_session_teardown(cls_session); return NULL; } /** * cxgb3i_session_destroy - destroys iscsi session * @cls_session: pointer to iscsi cls session * * Destroys an iSCSI session instance and releases its all resources held */ static void cxgb3i_session_destroy(struct iscsi_cls_session *cls_session) { cxgb3i_api_debug("sess 0x%p.\n", cls_session); iscsi_tcp_r2tpool_free(cls_session->dd_data); iscsi_session_teardown(cls_session); } /** * cxgb3i_conn_max_xmit_dlength -- calc the max. xmit pdu segment size * @conn: iscsi connection * check the max. xmit pdu payload, reduce it if needed */ static inline int cxgb3i_conn_max_xmit_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 = max(512 * MAX_SKB_FRAGS, SKB_TX_HEADROOM); max = min(cconn->hba->snic->tx_max_size, max); if (conn->max_xmit_dlength) conn->max_xmit_dlength = min(conn->max_xmit_dlength, max); else conn->max_xmit_dlength = max; align_pdu_size(conn->max_xmit_dlength); cxgb3i_api_debug("conn 0x%p, max xmit %u.\n", conn, conn->max_xmit_dlength); return 0; } /** * cxgb3i_conn_max_recv_dlength -- check the max. recv pdu segment size * @conn: iscsi connection * 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, "%pI4", &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, "%pI4", &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 * @task: iscsi task * @hdr_itt: tag, filled in by this function * Set up ddp for scsi read tasks if possible. */ 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 * @task: iscsi task * @hdr_itt: tag * If the tag is a ddp tag, release the ddp setup */ 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_HOST_QDEPTH, .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, .target_alloc = iscsi_target_alloc, .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_TGT_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); } }