568 lines
15 KiB
C
568 lines
15 KiB
C
/*
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* zfcp device driver
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*
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* Fibre Channel related functions for the zfcp device driver.
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*
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* Copyright IBM Corporation 2008
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*/
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#include "zfcp_ext.h"
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struct ct_iu_gpn_ft_req {
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struct ct_hdr header;
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u8 flags;
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u8 domain_id_scope;
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u8 area_id_scope;
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u8 fc4_type;
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} __attribute__ ((packed));
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struct gpn_ft_resp_acc {
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u8 control;
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u8 port_id[3];
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u8 reserved[4];
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u64 wwpn;
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} __attribute__ ((packed));
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#define ZFCP_GPN_FT_ENTRIES ((PAGE_SIZE - sizeof(struct ct_hdr)) \
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/ sizeof(struct gpn_ft_resp_acc))
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#define ZFCP_GPN_FT_BUFFERS 4
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#define ZFCP_GPN_FT_MAX_ENTRIES ZFCP_GPN_FT_BUFFERS * (ZFCP_GPN_FT_ENTRIES + 1)
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struct ct_iu_gpn_ft_resp {
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struct ct_hdr header;
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struct gpn_ft_resp_acc accept[ZFCP_GPN_FT_ENTRIES];
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} __attribute__ ((packed));
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struct zfcp_gpn_ft {
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struct zfcp_send_ct ct;
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struct scatterlist sg_req;
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struct scatterlist sg_resp[ZFCP_GPN_FT_BUFFERS];
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};
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static struct zfcp_port *zfcp_get_port_by_did(struct zfcp_adapter *adapter,
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u32 d_id)
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{
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struct zfcp_port *port;
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list_for_each_entry(port, &adapter->port_list_head, list)
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if ((port->d_id == d_id) &&
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!atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
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return port;
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return NULL;
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}
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static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
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struct fcp_rscn_element *elem)
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{
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unsigned long flags;
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struct zfcp_port *port;
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read_lock_irqsave(&zfcp_data.config_lock, flags);
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list_for_each_entry(port, &fsf_req->adapter->port_list_head, list) {
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if (atomic_test_mask(ZFCP_STATUS_PORT_WKA, &port->status))
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continue;
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/* FIXME: ZFCP_STATUS_PORT_DID_DID check is racy */
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if (!atomic_test_mask(ZFCP_STATUS_PORT_DID_DID, &port->status))
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/* Try to connect to unused ports anyway. */
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zfcp_erp_port_reopen(port,
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ZFCP_STATUS_COMMON_ERP_FAILED,
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82, fsf_req);
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else if ((port->d_id & range) == (elem->nport_did & range))
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/* Check connection status for connected ports */
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zfcp_test_link(port);
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}
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read_unlock_irqrestore(&zfcp_data.config_lock, flags);
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}
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static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
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{
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struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
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struct fcp_rscn_head *fcp_rscn_head;
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struct fcp_rscn_element *fcp_rscn_element;
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u16 i;
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u16 no_entries;
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u32 range_mask;
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fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload.data;
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fcp_rscn_element = (struct fcp_rscn_element *) fcp_rscn_head;
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/* see FC-FS */
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no_entries = fcp_rscn_head->payload_len /
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sizeof(struct fcp_rscn_element);
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for (i = 1; i < no_entries; i++) {
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/* skip head and start with 1st element */
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fcp_rscn_element++;
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switch (fcp_rscn_element->addr_format) {
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case ZFCP_PORT_ADDRESS:
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range_mask = ZFCP_PORTS_RANGE_PORT;
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break;
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case ZFCP_AREA_ADDRESS:
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range_mask = ZFCP_PORTS_RANGE_AREA;
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break;
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case ZFCP_DOMAIN_ADDRESS:
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range_mask = ZFCP_PORTS_RANGE_DOMAIN;
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break;
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case ZFCP_FABRIC_ADDRESS:
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range_mask = ZFCP_PORTS_RANGE_FABRIC;
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break;
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default:
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continue;
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}
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_zfcp_fc_incoming_rscn(fsf_req, range_mask, fcp_rscn_element);
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}
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schedule_work(&fsf_req->adapter->scan_work);
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}
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static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, wwn_t wwpn)
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{
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struct zfcp_adapter *adapter = req->adapter;
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struct zfcp_port *port;
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unsigned long flags;
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read_lock_irqsave(&zfcp_data.config_lock, flags);
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list_for_each_entry(port, &adapter->port_list_head, list)
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if (port->wwpn == wwpn)
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break;
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read_unlock_irqrestore(&zfcp_data.config_lock, flags);
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if (port && (port->wwpn == wwpn))
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zfcp_erp_port_forced_reopen(port, 0, 83, req);
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}
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static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
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{
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struct fsf_status_read_buffer *status_buffer =
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(struct fsf_status_read_buffer *)req->data;
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struct fsf_plogi *els_plogi =
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(struct fsf_plogi *) status_buffer->payload.data;
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zfcp_fc_incoming_wwpn(req, els_plogi->serv_param.wwpn);
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}
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static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
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{
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struct fsf_status_read_buffer *status_buffer =
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(struct fsf_status_read_buffer *)req->data;
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struct fcp_logo *els_logo =
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(struct fcp_logo *) status_buffer->payload.data;
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zfcp_fc_incoming_wwpn(req, els_logo->nport_wwpn);
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}
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/**
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* zfcp_fc_incoming_els - handle incoming ELS
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* @fsf_req - request which contains incoming ELS
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*/
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void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
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{
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struct fsf_status_read_buffer *status_buffer =
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(struct fsf_status_read_buffer *) fsf_req->data;
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unsigned int els_type = status_buffer->payload.data[0];
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zfcp_san_dbf_event_incoming_els(fsf_req);
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if (els_type == LS_PLOGI)
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zfcp_fc_incoming_plogi(fsf_req);
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else if (els_type == LS_LOGO)
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zfcp_fc_incoming_logo(fsf_req);
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else if (els_type == LS_RSCN)
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zfcp_fc_incoming_rscn(fsf_req);
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}
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static void zfcp_ns_gid_pn_handler(unsigned long data)
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{
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struct zfcp_gid_pn_data *gid_pn = (struct zfcp_gid_pn_data *) data;
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struct zfcp_send_ct *ct = &gid_pn->ct;
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struct ct_iu_gid_pn_req *ct_iu_req = sg_virt(ct->req);
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struct ct_iu_gid_pn_resp *ct_iu_resp = sg_virt(ct->resp);
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struct zfcp_port *port = gid_pn->port;
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if (ct->status)
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goto out;
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if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT) {
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atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
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goto out;
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}
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/* paranoia */
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if (ct_iu_req->wwpn != port->wwpn)
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goto out;
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/* looks like a valid d_id */
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port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
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atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
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out:
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mempool_free(gid_pn, port->adapter->pool.data_gid_pn);
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}
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/**
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* zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
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* @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
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* return: -ENOMEM on error, 0 otherwise
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*/
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int zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
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{
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int ret;
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struct zfcp_gid_pn_data *gid_pn;
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struct zfcp_adapter *adapter = erp_action->adapter;
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gid_pn = mempool_alloc(adapter->pool.data_gid_pn, GFP_ATOMIC);
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if (!gid_pn)
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return -ENOMEM;
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memset(gid_pn, 0, sizeof(*gid_pn));
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/* setup parameters for send generic command */
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gid_pn->port = erp_action->port;
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gid_pn->ct.port = adapter->nameserver_port;
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gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
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gid_pn->ct.handler_data = (unsigned long) gid_pn;
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gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
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gid_pn->ct.req = &gid_pn->req;
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gid_pn->ct.resp = &gid_pn->resp;
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gid_pn->ct.req_count = 1;
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gid_pn->ct.resp_count = 1;
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sg_init_one(&gid_pn->req, &gid_pn->ct_iu_req,
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sizeof(struct ct_iu_gid_pn_req));
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sg_init_one(&gid_pn->resp, &gid_pn->ct_iu_resp,
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sizeof(struct ct_iu_gid_pn_resp));
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/* setup nameserver request */
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gid_pn->ct_iu_req.header.revision = ZFCP_CT_REVISION;
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gid_pn->ct_iu_req.header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
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gid_pn->ct_iu_req.header.gs_subtype = ZFCP_CT_NAME_SERVER;
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gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS;
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gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN;
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gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_MAX_SIZE;
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gid_pn->ct_iu_req.wwpn = erp_action->port->wwpn;
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ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
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erp_action);
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if (ret)
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mempool_free(gid_pn, adapter->pool.data_gid_pn);
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return ret;
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}
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/**
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* zfcp_fc_plogi_evaluate - evaluate PLOGI playload
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* @port: zfcp_port structure
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* @plogi: plogi payload
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*
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* Evaluate PLOGI playload and copy important fields into zfcp_port structure
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*/
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void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
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{
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port->maxframe_size = plogi->serv_param.common_serv_param[7] |
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((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
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if (plogi->serv_param.class1_serv_param[0] & 0x80)
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port->supported_classes |= FC_COS_CLASS1;
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if (plogi->serv_param.class2_serv_param[0] & 0x80)
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port->supported_classes |= FC_COS_CLASS2;
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if (plogi->serv_param.class3_serv_param[0] & 0x80)
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port->supported_classes |= FC_COS_CLASS3;
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if (plogi->serv_param.class4_serv_param[0] & 0x80)
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port->supported_classes |= FC_COS_CLASS4;
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}
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struct zfcp_els_adisc {
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struct zfcp_send_els els;
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struct scatterlist req;
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struct scatterlist resp;
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struct zfcp_ls_adisc ls_adisc;
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struct zfcp_ls_adisc_acc ls_adisc_acc;
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};
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static void zfcp_fc_adisc_handler(unsigned long data)
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{
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struct zfcp_els_adisc *adisc = (struct zfcp_els_adisc *) data;
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struct zfcp_port *port = adisc->els.port;
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struct zfcp_ls_adisc_acc *ls_adisc = &adisc->ls_adisc_acc;
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if (adisc->els.status) {
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/* request rejected or timed out */
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zfcp_erp_port_forced_reopen(port, 0, 63, NULL);
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goto out;
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}
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if (!port->wwnn)
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port->wwnn = ls_adisc->wwnn;
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if (port->wwpn != ls_adisc->wwpn)
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zfcp_erp_port_reopen(port, 0, 64, NULL);
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out:
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zfcp_port_put(port);
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kfree(adisc);
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}
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static int zfcp_fc_adisc(struct zfcp_port *port)
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{
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struct zfcp_els_adisc *adisc;
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struct zfcp_adapter *adapter = port->adapter;
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adisc = kzalloc(sizeof(struct zfcp_els_adisc), GFP_ATOMIC);
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if (!adisc)
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return -ENOMEM;
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adisc->els.req = &adisc->req;
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adisc->els.resp = &adisc->resp;
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sg_init_one(adisc->els.req, &adisc->ls_adisc,
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sizeof(struct zfcp_ls_adisc));
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sg_init_one(adisc->els.resp, &adisc->ls_adisc_acc,
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sizeof(struct zfcp_ls_adisc_acc));
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adisc->els.req_count = 1;
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adisc->els.resp_count = 1;
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adisc->els.adapter = adapter;
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adisc->els.port = port;
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adisc->els.d_id = port->d_id;
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adisc->els.handler = zfcp_fc_adisc_handler;
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adisc->els.handler_data = (unsigned long) adisc;
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adisc->els.ls_code = adisc->ls_adisc.code = ZFCP_LS_ADISC;
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/* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
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without FC-AL-2 capability, so we don't set it */
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adisc->ls_adisc.wwpn = fc_host_port_name(adapter->scsi_host);
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adisc->ls_adisc.wwnn = fc_host_node_name(adapter->scsi_host);
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adisc->ls_adisc.nport_id = fc_host_port_id(adapter->scsi_host);
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return zfcp_fsf_send_els(&adisc->els);
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}
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/**
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* zfcp_test_link - lightweight link test procedure
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* @port: port to be tested
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*
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* Test status of a link to a remote port using the ELS command ADISC.
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* If there is a problem with the remote port, error recovery steps
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* will be triggered.
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*/
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void zfcp_test_link(struct zfcp_port *port)
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{
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int retval;
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zfcp_port_get(port);
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retval = zfcp_fc_adisc(port);
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if (retval == 0 || retval == -EBUSY)
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return;
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/* send of ADISC was not possible */
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zfcp_port_put(port);
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zfcp_erp_port_forced_reopen(port, 0, 65, NULL);
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}
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static int zfcp_scan_get_nameserver(struct zfcp_adapter *adapter)
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{
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int ret;
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if (!adapter->nameserver_port)
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return -EINTR;
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if (!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
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&adapter->nameserver_port->status)) {
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ret = zfcp_erp_port_reopen(adapter->nameserver_port, 0, 148,
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NULL);
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if (ret)
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return ret;
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zfcp_erp_wait(adapter);
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zfcp_port_put(adapter->nameserver_port);
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}
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return !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
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&adapter->nameserver_port->status);
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}
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static void zfcp_gpn_ft_handler(unsigned long _done)
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{
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complete((struct completion *)_done);
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}
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static void zfcp_free_sg_env(struct zfcp_gpn_ft *gpn_ft)
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{
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struct scatterlist *sg = &gpn_ft->sg_req;
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kfree(sg_virt(sg)); /* free request buffer */
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zfcp_sg_free_table(gpn_ft->sg_resp, ZFCP_GPN_FT_BUFFERS);
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kfree(gpn_ft);
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}
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static struct zfcp_gpn_ft *zfcp_alloc_sg_env(void)
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{
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struct zfcp_gpn_ft *gpn_ft;
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struct ct_iu_gpn_ft_req *req;
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gpn_ft = kzalloc(sizeof(*gpn_ft), GFP_KERNEL);
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if (!gpn_ft)
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return NULL;
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req = kzalloc(sizeof(struct ct_iu_gpn_ft_req), GFP_KERNEL);
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if (!req) {
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kfree(gpn_ft);
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gpn_ft = NULL;
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goto out;
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}
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sg_init_one(&gpn_ft->sg_req, req, sizeof(*req));
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if (zfcp_sg_setup_table(gpn_ft->sg_resp, ZFCP_GPN_FT_BUFFERS)) {
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zfcp_free_sg_env(gpn_ft);
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gpn_ft = NULL;
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}
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out:
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return gpn_ft;
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}
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static int zfcp_scan_issue_gpn_ft(struct zfcp_gpn_ft *gpn_ft,
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struct zfcp_adapter *adapter)
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{
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struct zfcp_send_ct *ct = &gpn_ft->ct;
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struct ct_iu_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req);
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struct completion done;
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int ret;
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/* prepare CT IU for GPN_FT */
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req->header.revision = ZFCP_CT_REVISION;
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req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
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req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
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req->header.options = ZFCP_CT_SYNCHRONOUS;
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req->header.cmd_rsp_code = ZFCP_CT_GPN_FT;
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req->header.max_res_size = (sizeof(struct gpn_ft_resp_acc) *
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(ZFCP_GPN_FT_MAX_ENTRIES - 1)) >> 2;
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req->flags = 0;
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req->domain_id_scope = 0;
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req->area_id_scope = 0;
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req->fc4_type = ZFCP_CT_SCSI_FCP;
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/* prepare zfcp_send_ct */
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ct->port = adapter->nameserver_port;
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ct->handler = zfcp_gpn_ft_handler;
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ct->handler_data = (unsigned long)&done;
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ct->timeout = 10;
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ct->req = &gpn_ft->sg_req;
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ct->resp = gpn_ft->sg_resp;
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ct->req_count = 1;
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ct->resp_count = ZFCP_GPN_FT_BUFFERS;
|
|
|
|
init_completion(&done);
|
|
ret = zfcp_fsf_send_ct(ct, NULL, NULL);
|
|
if (!ret)
|
|
wait_for_completion(&done);
|
|
return ret;
|
|
}
|
|
|
|
static void zfcp_validate_port(struct zfcp_port *port)
|
|
{
|
|
struct zfcp_adapter *adapter = port->adapter;
|
|
|
|
atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
|
|
|
|
if (port == adapter->nameserver_port)
|
|
return;
|
|
if ((port->supported_classes != 0) || (port->units != 0)) {
|
|
zfcp_port_put(port);
|
|
return;
|
|
}
|
|
zfcp_erp_port_shutdown(port, 0, 151, NULL);
|
|
zfcp_erp_wait(adapter);
|
|
zfcp_port_put(port);
|
|
zfcp_port_dequeue(port);
|
|
}
|
|
|
|
static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft)
|
|
{
|
|
struct zfcp_send_ct *ct = &gpn_ft->ct;
|
|
struct scatterlist *sg = gpn_ft->sg_resp;
|
|
struct ct_hdr *hdr = sg_virt(sg);
|
|
struct gpn_ft_resp_acc *acc = sg_virt(sg);
|
|
struct zfcp_adapter *adapter = ct->port->adapter;
|
|
struct zfcp_port *port, *tmp;
|
|
u32 d_id;
|
|
int ret = 0, x;
|
|
|
|
if (ct->status)
|
|
return -EIO;
|
|
|
|
if (hdr->cmd_rsp_code != ZFCP_CT_ACCEPT) {
|
|
if (hdr->reason_code == ZFCP_CT_UNABLE_TO_PERFORM_CMD)
|
|
return -EAGAIN; /* might be a temporary condition */
|
|
return -EIO;
|
|
}
|
|
|
|
if (hdr->max_res_size)
|
|
return -E2BIG;
|
|
|
|
down(&zfcp_data.config_sema);
|
|
|
|
/* first entry is the header */
|
|
for (x = 1; x < ZFCP_GPN_FT_MAX_ENTRIES; x++) {
|
|
if (x % (ZFCP_GPN_FT_ENTRIES + 1))
|
|
acc++;
|
|
else
|
|
acc = sg_virt(++sg);
|
|
|
|
d_id = acc->port_id[0] << 16 | acc->port_id[1] << 8 |
|
|
acc->port_id[2];
|
|
|
|
/* skip the adapter's port and known remote ports */
|
|
if (acc->wwpn == fc_host_port_name(adapter->scsi_host) ||
|
|
zfcp_get_port_by_did(adapter, d_id))
|
|
continue;
|
|
|
|
port = zfcp_port_enqueue(adapter, acc->wwpn,
|
|
ZFCP_STATUS_PORT_DID_DID |
|
|
ZFCP_STATUS_COMMON_NOESC, d_id);
|
|
if (IS_ERR(port))
|
|
ret = PTR_ERR(port);
|
|
else
|
|
zfcp_erp_port_reopen(port, 0, 149, NULL);
|
|
if (acc->control & 0x80) /* last entry */
|
|
break;
|
|
}
|
|
|
|
zfcp_erp_wait(adapter);
|
|
list_for_each_entry_safe(port, tmp, &adapter->port_list_head, list)
|
|
zfcp_validate_port(port);
|
|
up(&zfcp_data.config_sema);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* zfcp_scan_ports - scan remote ports and attach new ports
|
|
* @adapter: pointer to struct zfcp_adapter
|
|
*/
|
|
int zfcp_scan_ports(struct zfcp_adapter *adapter)
|
|
{
|
|
int ret, i;
|
|
struct zfcp_gpn_ft *gpn_ft;
|
|
|
|
zfcp_erp_wait(adapter); /* wait until adapter is finished with ERP */
|
|
if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT)
|
|
return 0;
|
|
|
|
ret = zfcp_scan_get_nameserver(adapter);
|
|
if (ret)
|
|
return ret;
|
|
|
|
gpn_ft = zfcp_alloc_sg_env();
|
|
if (!gpn_ft)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
ret = zfcp_scan_issue_gpn_ft(gpn_ft, adapter);
|
|
if (!ret) {
|
|
ret = zfcp_scan_eval_gpn_ft(gpn_ft);
|
|
if (ret == -EAGAIN)
|
|
ssleep(1);
|
|
else
|
|
break;
|
|
}
|
|
}
|
|
zfcp_free_sg_env(gpn_ft);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
void _zfcp_scan_ports_later(struct work_struct *work)
|
|
{
|
|
zfcp_scan_ports(container_of(work, struct zfcp_adapter, scan_work));
|
|
}
|