diff options
Diffstat (limited to '')
-rw-r--r-- | drivers/scsi/elx/libefc/efc_fabric.c | 1563 |
1 files changed, 1563 insertions, 0 deletions
diff --git a/drivers/scsi/elx/libefc/efc_fabric.c b/drivers/scsi/elx/libefc/efc_fabric.c new file mode 100644 index 0000000000..9661eea93a --- /dev/null +++ b/drivers/scsi/elx/libefc/efc_fabric.c @@ -0,0 +1,1563 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2021 Broadcom. All Rights Reserved. The term + * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries. + */ + +/* + * This file implements remote node state machines for: + * - Fabric logins. + * - Fabric controller events. + * - Name/directory services interaction. + * - Point-to-point logins. + */ + +/* + * fabric_sm Node State Machine: Fabric States + * ns_sm Node State Machine: Name/Directory Services States + * p2p_sm Node State Machine: Point-to-Point Node States + */ + +#include "efc.h" + +static void +efc_fabric_initiate_shutdown(struct efc_node *node) +{ + struct efc *efc = node->efc; + + node->els_io_enabled = false; + + if (node->attached) { + int rc; + + /* issue hw node free; don't care if succeeds right away + * or sometime later, will check node->attached later in + * shutdown process + */ + rc = efc_cmd_node_detach(efc, &node->rnode); + if (rc < 0) { + node_printf(node, "Failed freeing HW node, rc=%d\n", + rc); + } + } + /* + * node has either been detached or is in the process of being detached, + * call common node's initiate cleanup function + */ + efc_node_initiate_cleanup(node); +} + +static void +__efc_fabric_common(const char *funcname, struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node *node = NULL; + + node = ctx->app; + + switch (evt) { + case EFC_EVT_DOMAIN_ATTACH_OK: + break; + case EFC_EVT_SHUTDOWN: + node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT; + efc_fabric_initiate_shutdown(node); + break; + + default: + /* call default event handler common to all nodes */ + __efc_node_common(funcname, ctx, evt, arg); + } +} + +void +__efc_fabric_init(struct efc_sm_ctx *ctx, enum efc_sm_event evt, + void *arg) +{ + struct efc_node *node = ctx->app; + struct efc *efc = node->efc; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + switch (evt) { + case EFC_EVT_REENTER: + efc_log_debug(efc, ">>> reenter !!\n"); + fallthrough; + + case EFC_EVT_ENTER: + /* send FLOGI */ + efc_send_flogi(node); + efc_node_transition(node, __efc_fabric_flogi_wait_rsp, NULL); + break; + + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +void +efc_fabric_set_topology(struct efc_node *node, + enum efc_nport_topology topology) +{ + node->nport->topology = topology; +} + +void +efc_fabric_notify_topology(struct efc_node *node) +{ + struct efc_node *tmp_node; + unsigned long index; + + /* + * now loop through the nodes in the nport + * and send topology notification + */ + xa_for_each(&node->nport->lookup, index, tmp_node) { + if (tmp_node != node) { + efc_node_post_event(tmp_node, + EFC_EVT_NPORT_TOPOLOGY_NOTIFY, + &node->nport->topology); + } + } +} + +static bool efc_rnode_is_nport(struct fc_els_flogi *rsp) +{ + return !(ntohs(rsp->fl_csp.sp_features) & FC_SP_FT_FPORT); +} + +void +__efc_fabric_flogi_wait_rsp(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node_cb *cbdata = arg; + struct efc_node *node = ctx->app; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + switch (evt) { + case EFC_EVT_SRRS_ELS_REQ_OK: { + if (efc_node_check_els_req(ctx, evt, arg, ELS_FLOGI, + __efc_fabric_common, __func__)) { + return; + } + WARN_ON(!node->els_req_cnt); + node->els_req_cnt--; + + memcpy(node->nport->domain->flogi_service_params, + cbdata->els_rsp.virt, + sizeof(struct fc_els_flogi)); + + /* Check to see if the fabric is an F_PORT or and N_PORT */ + if (!efc_rnode_is_nport(cbdata->els_rsp.virt)) { + /* sm: if not nport / efc_domain_attach */ + /* ext_status has the fc_id, attach domain */ + efc_fabric_set_topology(node, EFC_NPORT_TOPO_FABRIC); + efc_fabric_notify_topology(node); + WARN_ON(node->nport->domain->attached); + efc_domain_attach(node->nport->domain, + cbdata->ext_status); + efc_node_transition(node, + __efc_fabric_wait_domain_attach, + NULL); + break; + } + + /* sm: if nport and p2p_winner / efc_domain_attach */ + efc_fabric_set_topology(node, EFC_NPORT_TOPO_P2P); + if (efc_p2p_setup(node->nport)) { + node_printf(node, + "p2p setup failed, shutting down node\n"); + node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT; + efc_fabric_initiate_shutdown(node); + break; + } + + if (node->nport->p2p_winner) { + efc_node_transition(node, + __efc_p2p_wait_domain_attach, + NULL); + if (node->nport->domain->attached && + !node->nport->domain->domain_notify_pend) { + /* + * already attached, + * just send ATTACH_OK + */ + node_printf(node, + "p2p winner, domain already attached\n"); + efc_node_post_event(node, + EFC_EVT_DOMAIN_ATTACH_OK, + NULL); + } + } else { + /* + * peer is p2p winner; + * PLOGI will be received on the + * remote SID=1 node; + * this node has served its purpose + */ + node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT; + efc_fabric_initiate_shutdown(node); + } + + break; + } + + case EFC_EVT_ELS_REQ_ABORTED: + case EFC_EVT_SRRS_ELS_REQ_RJT: + case EFC_EVT_SRRS_ELS_REQ_FAIL: { + struct efc_nport *nport = node->nport; + /* + * with these errors, we have no recovery, + * so shutdown the nport, leave the link + * up and the domain ready + */ + if (efc_node_check_els_req(ctx, evt, arg, ELS_FLOGI, + __efc_fabric_common, __func__)) { + return; + } + node_printf(node, + "FLOGI failed evt=%s, shutting down nport [%s]\n", + efc_sm_event_name(evt), nport->display_name); + WARN_ON(!node->els_req_cnt); + node->els_req_cnt--; + efc_sm_post_event(&nport->sm, EFC_EVT_SHUTDOWN, NULL); + break; + } + + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +void +__efc_vport_fabric_init(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node *node = ctx->app; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + switch (evt) { + case EFC_EVT_ENTER: + /* sm: / send FDISC */ + efc_send_fdisc(node); + efc_node_transition(node, __efc_fabric_fdisc_wait_rsp, NULL); + break; + + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +void +__efc_fabric_fdisc_wait_rsp(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node_cb *cbdata = arg; + struct efc_node *node = ctx->app; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + switch (evt) { + case EFC_EVT_SRRS_ELS_REQ_OK: { + /* fc_id is in ext_status */ + if (efc_node_check_els_req(ctx, evt, arg, ELS_FDISC, + __efc_fabric_common, __func__)) { + return; + } + + WARN_ON(!node->els_req_cnt); + node->els_req_cnt--; + /* sm: / efc_nport_attach */ + efc_nport_attach(node->nport, cbdata->ext_status); + efc_node_transition(node, __efc_fabric_wait_domain_attach, + NULL); + break; + } + + case EFC_EVT_SRRS_ELS_REQ_RJT: + case EFC_EVT_SRRS_ELS_REQ_FAIL: { + if (efc_node_check_els_req(ctx, evt, arg, ELS_FDISC, + __efc_fabric_common, __func__)) { + return; + } + WARN_ON(!node->els_req_cnt); + node->els_req_cnt--; + efc_log_err(node->efc, "FDISC failed, shutting down nport\n"); + /* sm: / shutdown nport */ + efc_sm_post_event(&node->nport->sm, EFC_EVT_SHUTDOWN, NULL); + break; + } + + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +static int +efc_start_ns_node(struct efc_nport *nport) +{ + struct efc_node *ns; + + /* Instantiate a name services node */ + ns = efc_node_find(nport, FC_FID_DIR_SERV); + if (!ns) { + ns = efc_node_alloc(nport, FC_FID_DIR_SERV, false, false); + if (!ns) + return -EIO; + } + /* + * for found ns, should we be transitioning from here? + * breaks transition only + * 1. from within state machine or + * 2. if after alloc + */ + if (ns->efc->nodedb_mask & EFC_NODEDB_PAUSE_NAMESERVER) + efc_node_pause(ns, __efc_ns_init); + else + efc_node_transition(ns, __efc_ns_init, NULL); + return 0; +} + +static int +efc_start_fabctl_node(struct efc_nport *nport) +{ + struct efc_node *fabctl; + + fabctl = efc_node_find(nport, FC_FID_FCTRL); + if (!fabctl) { + fabctl = efc_node_alloc(nport, FC_FID_FCTRL, + false, false); + if (!fabctl) + return -EIO; + } + /* + * for found ns, should we be transitioning from here? + * breaks transition only + * 1. from within state machine or + * 2. if after alloc + */ + efc_node_transition(fabctl, __efc_fabctl_init, NULL); + return 0; +} + +void +__efc_fabric_wait_domain_attach(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node *node = ctx->app; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + switch (evt) { + case EFC_EVT_ENTER: + efc_node_hold_frames(node); + break; + + case EFC_EVT_EXIT: + efc_node_accept_frames(node); + break; + case EFC_EVT_DOMAIN_ATTACH_OK: + case EFC_EVT_NPORT_ATTACH_OK: { + int rc; + + rc = efc_start_ns_node(node->nport); + if (rc) + return; + + /* sm: if enable_ini / start fabctl node */ + /* Instantiate the fabric controller (sends SCR) */ + if (node->nport->enable_rscn) { + rc = efc_start_fabctl_node(node->nport); + if (rc) + return; + } + efc_node_transition(node, __efc_fabric_idle, NULL); + break; + } + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +void +__efc_fabric_idle(struct efc_sm_ctx *ctx, enum efc_sm_event evt, + void *arg) +{ + struct efc_node *node = ctx->app; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + switch (evt) { + case EFC_EVT_DOMAIN_ATTACH_OK: + break; + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +void +__efc_ns_init(struct efc_sm_ctx *ctx, enum efc_sm_event evt, void *arg) +{ + struct efc_node *node = ctx->app; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + switch (evt) { + case EFC_EVT_ENTER: + /* sm: / send PLOGI */ + efc_send_plogi(node); + efc_node_transition(node, __efc_ns_plogi_wait_rsp, NULL); + break; + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +void +__efc_ns_plogi_wait_rsp(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node_cb *cbdata = arg; + struct efc_node *node = ctx->app; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + switch (evt) { + case EFC_EVT_SRRS_ELS_REQ_OK: { + int rc; + + /* Save service parameters */ + if (efc_node_check_els_req(ctx, evt, arg, ELS_PLOGI, + __efc_fabric_common, __func__)) { + return; + } + WARN_ON(!node->els_req_cnt); + node->els_req_cnt--; + /* sm: / save sparams, efc_node_attach */ + efc_node_save_sparms(node, cbdata->els_rsp.virt); + rc = efc_node_attach(node); + efc_node_transition(node, __efc_ns_wait_node_attach, NULL); + if (rc < 0) + efc_node_post_event(node, EFC_EVT_NODE_ATTACH_FAIL, + NULL); + break; + } + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +void +__efc_ns_wait_node_attach(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node *node = ctx->app; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + switch (evt) { + case EFC_EVT_ENTER: + efc_node_hold_frames(node); + break; + + case EFC_EVT_EXIT: + efc_node_accept_frames(node); + break; + + case EFC_EVT_NODE_ATTACH_OK: + node->attached = true; + /* sm: / send RFTID */ + efc_ns_send_rftid(node); + efc_node_transition(node, __efc_ns_rftid_wait_rsp, NULL); + break; + + case EFC_EVT_NODE_ATTACH_FAIL: + /* node attach failed, shutdown the node */ + node->attached = false; + node_printf(node, "Node attach failed\n"); + node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT; + efc_fabric_initiate_shutdown(node); + break; + + case EFC_EVT_SHUTDOWN: + node_printf(node, "Shutdown event received\n"); + node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT; + efc_node_transition(node, + __efc_fabric_wait_attach_evt_shutdown, + NULL); + break; + + /* + * if receive RSCN just ignore, + * we haven't sent GID_PT yet (ACC sent by fabctl node) + */ + case EFC_EVT_RSCN_RCVD: + break; + + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +void +__efc_fabric_wait_attach_evt_shutdown(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node *node = ctx->app; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + switch (evt) { + case EFC_EVT_ENTER: + efc_node_hold_frames(node); + break; + + case EFC_EVT_EXIT: + efc_node_accept_frames(node); + break; + + /* wait for any of these attach events and then shutdown */ + case EFC_EVT_NODE_ATTACH_OK: + node->attached = true; + node_printf(node, "Attach evt=%s, proceed to shutdown\n", + efc_sm_event_name(evt)); + efc_fabric_initiate_shutdown(node); + break; + + case EFC_EVT_NODE_ATTACH_FAIL: + node->attached = false; + node_printf(node, "Attach evt=%s, proceed to shutdown\n", + efc_sm_event_name(evt)); + efc_fabric_initiate_shutdown(node); + break; + + /* ignore shutdown event as we're already in shutdown path */ + case EFC_EVT_SHUTDOWN: + node_printf(node, "Shutdown event received\n"); + break; + + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +void +__efc_ns_rftid_wait_rsp(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node *node = ctx->app; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + switch (evt) { + case EFC_EVT_SRRS_ELS_REQ_OK: + if (efc_node_check_ns_req(ctx, evt, arg, FC_NS_RFT_ID, + __efc_fabric_common, __func__)) { + return; + } + WARN_ON(!node->els_req_cnt); + node->els_req_cnt--; + /* sm: / send RFFID */ + efc_ns_send_rffid(node); + efc_node_transition(node, __efc_ns_rffid_wait_rsp, NULL); + break; + + /* + * if receive RSCN just ignore, + * we haven't sent GID_PT yet (ACC sent by fabctl node) + */ + case EFC_EVT_RSCN_RCVD: + break; + + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +void +__efc_ns_rffid_wait_rsp(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node *node = ctx->app; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + /* + * Waits for an RFFID response event; + * if rscn enabled, a GIDPT name services request is issued. + */ + switch (evt) { + case EFC_EVT_SRRS_ELS_REQ_OK: { + if (efc_node_check_ns_req(ctx, evt, arg, FC_NS_RFF_ID, + __efc_fabric_common, __func__)) { + return; + } + WARN_ON(!node->els_req_cnt); + node->els_req_cnt--; + if (node->nport->enable_rscn) { + /* sm: if enable_rscn / send GIDPT */ + efc_ns_send_gidpt(node); + + efc_node_transition(node, __efc_ns_gidpt_wait_rsp, + NULL); + } else { + /* if 'T' only, we're done, go to idle */ + efc_node_transition(node, __efc_ns_idle, NULL); + } + break; + } + /* + * if receive RSCN just ignore, + * we haven't sent GID_PT yet (ACC sent by fabctl node) + */ + case EFC_EVT_RSCN_RCVD: + break; + + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +static int +efc_process_gidpt_payload(struct efc_node *node, + void *data, u32 gidpt_len) +{ + u32 i, j; + struct efc_node *newnode; + struct efc_nport *nport = node->nport; + struct efc *efc = node->efc; + u32 port_id = 0, port_count, plist_count; + struct efc_node *n; + struct efc_node **active_nodes; + int residual; + struct { + struct fc_ct_hdr hdr; + struct fc_gid_pn_resp pn_rsp; + } *rsp; + struct fc_gid_pn_resp *gidpt; + unsigned long index; + + rsp = data; + gidpt = &rsp->pn_rsp; + residual = be16_to_cpu(rsp->hdr.ct_mr_size); + + if (residual != 0) + efc_log_debug(node->efc, "residual is %u words\n", residual); + + if (be16_to_cpu(rsp->hdr.ct_cmd) == FC_FS_RJT) { + node_printf(node, + "GIDPT request failed: rsn x%x rsn_expl x%x\n", + rsp->hdr.ct_reason, rsp->hdr.ct_explan); + return -EIO; + } + + plist_count = (gidpt_len - sizeof(struct fc_ct_hdr)) / sizeof(*gidpt); + + /* Count the number of nodes */ + port_count = 0; + xa_for_each(&nport->lookup, index, n) { + port_count++; + } + + /* Allocate a buffer for all nodes */ + active_nodes = kcalloc(port_count, sizeof(*active_nodes), GFP_ATOMIC); + if (!active_nodes) { + node_printf(node, "efc_malloc failed\n"); + return -EIO; + } + + /* Fill buffer with fc_id of active nodes */ + i = 0; + xa_for_each(&nport->lookup, index, n) { + port_id = n->rnode.fc_id; + switch (port_id) { + case FC_FID_FLOGI: + case FC_FID_FCTRL: + case FC_FID_DIR_SERV: + break; + default: + if (port_id != FC_FID_DOM_MGR) + active_nodes[i++] = n; + break; + } + } + + /* update the active nodes buffer */ + for (i = 0; i < plist_count; i++) { + hton24(gidpt[i].fp_fid, port_id); + + for (j = 0; j < port_count; j++) { + if (active_nodes[j] && + port_id == active_nodes[j]->rnode.fc_id) { + active_nodes[j] = NULL; + } + } + + if (gidpt[i].fp_resvd & FC_NS_FID_LAST) + break; + } + + /* Those remaining in the active_nodes[] are now gone ! */ + for (i = 0; i < port_count; i++) { + /* + * if we're an initiator and the remote node + * is a target, then post the node missing event. + * if we're target and we have enabled + * target RSCN, then post the node missing event. + */ + if (!active_nodes[i]) + continue; + + if ((node->nport->enable_ini && active_nodes[i]->targ) || + (node->nport->enable_tgt && enable_target_rscn(efc))) { + efc_node_post_event(active_nodes[i], + EFC_EVT_NODE_MISSING, NULL); + } else { + node_printf(node, + "GID_PT: skipping non-tgt port_id x%06x\n", + active_nodes[i]->rnode.fc_id); + } + } + kfree(active_nodes); + + for (i = 0; i < plist_count; i++) { + hton24(gidpt[i].fp_fid, port_id); + + /* Don't create node for ourselves */ + if (port_id == node->rnode.nport->fc_id) { + if (gidpt[i].fp_resvd & FC_NS_FID_LAST) + break; + continue; + } + + newnode = efc_node_find(nport, port_id); + if (!newnode) { + if (!node->nport->enable_ini) + continue; + + newnode = efc_node_alloc(nport, port_id, false, false); + if (!newnode) { + efc_log_err(efc, "efc_node_alloc() failed\n"); + return -EIO; + } + /* + * send PLOGI automatically + * if initiator + */ + efc_node_init_device(newnode, true); + } + + if (node->nport->enable_ini && newnode->targ) { + efc_node_post_event(newnode, EFC_EVT_NODE_REFOUND, + NULL); + } + + if (gidpt[i].fp_resvd & FC_NS_FID_LAST) + break; + } + return 0; +} + +void +__efc_ns_gidpt_wait_rsp(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node_cb *cbdata = arg; + struct efc_node *node = ctx->app; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + /* + * Wait for a GIDPT response from the name server. Process the FC_IDs + * that are reported by creating new remote ports, as needed. + */ + + switch (evt) { + case EFC_EVT_SRRS_ELS_REQ_OK: { + if (efc_node_check_ns_req(ctx, evt, arg, FC_NS_GID_PT, + __efc_fabric_common, __func__)) { + return; + } + WARN_ON(!node->els_req_cnt); + node->els_req_cnt--; + /* sm: / process GIDPT payload */ + efc_process_gidpt_payload(node, cbdata->els_rsp.virt, + cbdata->els_rsp.len); + efc_node_transition(node, __efc_ns_idle, NULL); + break; + } + + case EFC_EVT_SRRS_ELS_REQ_FAIL: { + /* not much we can do; will retry with the next RSCN */ + node_printf(node, "GID_PT failed to complete\n"); + WARN_ON(!node->els_req_cnt); + node->els_req_cnt--; + efc_node_transition(node, __efc_ns_idle, NULL); + break; + } + + /* if receive RSCN here, queue up another discovery processing */ + case EFC_EVT_RSCN_RCVD: { + node_printf(node, "RSCN received during GID_PT processing\n"); + node->rscn_pending = true; + break; + } + + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +void +__efc_ns_idle(struct efc_sm_ctx *ctx, enum efc_sm_event evt, void *arg) +{ + struct efc_node *node = ctx->app; + struct efc *efc = node->efc; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + /* + * Wait for RSCN received events (posted from the fabric controller) + * and restart the GIDPT name services query and processing. + */ + + switch (evt) { + case EFC_EVT_ENTER: + if (!node->rscn_pending) + break; + + node_printf(node, "RSCN pending, restart discovery\n"); + node->rscn_pending = false; + fallthrough; + + case EFC_EVT_RSCN_RCVD: { + /* sm: / send GIDPT */ + /* + * If target RSCN processing is enabled, + * and this is target only (not initiator), + * and tgt_rscn_delay is non-zero, + * then we delay issuing the GID_PT + */ + if (efc->tgt_rscn_delay_msec != 0 && + !node->nport->enable_ini && node->nport->enable_tgt && + enable_target_rscn(efc)) { + efc_node_transition(node, __efc_ns_gidpt_delay, NULL); + } else { + efc_ns_send_gidpt(node); + efc_node_transition(node, __efc_ns_gidpt_wait_rsp, + NULL); + } + break; + } + + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +static void +gidpt_delay_timer_cb(struct timer_list *t) +{ + struct efc_node *node = from_timer(node, t, gidpt_delay_timer); + + del_timer(&node->gidpt_delay_timer); + + efc_node_post_event(node, EFC_EVT_GIDPT_DELAY_EXPIRED, NULL); +} + +void +__efc_ns_gidpt_delay(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node *node = ctx->app; + struct efc *efc = node->efc; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + switch (evt) { + case EFC_EVT_ENTER: { + u64 delay_msec, tmp; + + /* + * Compute the delay time. + * Set to tgt_rscn_delay, if the time since last GIDPT + * is less than tgt_rscn_period, then use tgt_rscn_period. + */ + delay_msec = efc->tgt_rscn_delay_msec; + tmp = jiffies_to_msecs(jiffies) - node->time_last_gidpt_msec; + if (tmp < efc->tgt_rscn_period_msec) + delay_msec = efc->tgt_rscn_period_msec; + + timer_setup(&node->gidpt_delay_timer, &gidpt_delay_timer_cb, + 0); + mod_timer(&node->gidpt_delay_timer, + jiffies + msecs_to_jiffies(delay_msec)); + + break; + } + + case EFC_EVT_GIDPT_DELAY_EXPIRED: + node->time_last_gidpt_msec = jiffies_to_msecs(jiffies); + + efc_ns_send_gidpt(node); + efc_node_transition(node, __efc_ns_gidpt_wait_rsp, NULL); + break; + + case EFC_EVT_RSCN_RCVD: { + efc_log_debug(efc, + "RSCN received while in GIDPT delay - no action\n"); + break; + } + + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +void +__efc_fabctl_init(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node *node = ctx->app; + + node_sm_trace(); + + switch (evt) { + case EFC_EVT_ENTER: + /* no need to login to fabric controller, just send SCR */ + efc_send_scr(node); + efc_node_transition(node, __efc_fabctl_wait_scr_rsp, NULL); + break; + + case EFC_EVT_NODE_ATTACH_OK: + node->attached = true; + break; + + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +void +__efc_fabctl_wait_scr_rsp(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node *node = ctx->app; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + /* + * Fabric controller node state machine: + * Wait for an SCR response from the fabric controller. + */ + switch (evt) { + case EFC_EVT_SRRS_ELS_REQ_OK: + if (efc_node_check_els_req(ctx, evt, arg, ELS_SCR, + __efc_fabric_common, __func__)) { + return; + } + WARN_ON(!node->els_req_cnt); + node->els_req_cnt--; + efc_node_transition(node, __efc_fabctl_ready, NULL); + break; + + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +static void +efc_process_rscn(struct efc_node *node, struct efc_node_cb *cbdata) +{ + struct efc *efc = node->efc; + struct efc_nport *nport = node->nport; + struct efc_node *ns; + + /* Forward this event to the name-services node */ + ns = efc_node_find(nport, FC_FID_DIR_SERV); + if (ns) + efc_node_post_event(ns, EFC_EVT_RSCN_RCVD, cbdata); + else + efc_log_warn(efc, "can't find name server node\n"); +} + +void +__efc_fabctl_ready(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node_cb *cbdata = arg; + struct efc_node *node = ctx->app; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + /* + * Fabric controller node state machine: Ready. + * In this state, the fabric controller sends a RSCN, which is received + * by this node and is forwarded to the name services node object; and + * the RSCN LS_ACC is sent. + */ + switch (evt) { + case EFC_EVT_RSCN_RCVD: { + struct fc_frame_header *hdr = cbdata->header->dma.virt; + + /* + * sm: / process RSCN (forward to name services node), + * send LS_ACC + */ + efc_process_rscn(node, cbdata); + efc_send_ls_acc(node, be16_to_cpu(hdr->fh_ox_id)); + efc_node_transition(node, __efc_fabctl_wait_ls_acc_cmpl, + NULL); + break; + } + + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +void +__efc_fabctl_wait_ls_acc_cmpl(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node *node = ctx->app; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + switch (evt) { + case EFC_EVT_ENTER: + efc_node_hold_frames(node); + break; + + case EFC_EVT_EXIT: + efc_node_accept_frames(node); + break; + + case EFC_EVT_SRRS_ELS_CMPL_OK: + WARN_ON(!node->els_cmpl_cnt); + node->els_cmpl_cnt--; + efc_node_transition(node, __efc_fabctl_ready, NULL); + break; + + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +static uint64_t +efc_get_wwpn(struct fc_els_flogi *sp) +{ + return be64_to_cpu(sp->fl_wwnn); +} + +static int +efc_rnode_is_winner(struct efc_nport *nport) +{ + struct fc_els_flogi *remote_sp; + u64 remote_wwpn; + u64 local_wwpn = nport->wwpn; + u64 wwn_bump = 0; + + remote_sp = (struct fc_els_flogi *)nport->domain->flogi_service_params; + remote_wwpn = efc_get_wwpn(remote_sp); + + local_wwpn ^= wwn_bump; + + efc_log_debug(nport->efc, "r: %llx\n", + be64_to_cpu(remote_sp->fl_wwpn)); + efc_log_debug(nport->efc, "l: %llx\n", local_wwpn); + + if (remote_wwpn == local_wwpn) { + efc_log_warn(nport->efc, + "WWPN of remote node [%08x %08x] matches local WWPN\n", + (u32)(local_wwpn >> 32ll), + (u32)local_wwpn); + return -1; + } + + return (remote_wwpn > local_wwpn); +} + +void +__efc_p2p_wait_domain_attach(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node *node = ctx->app; + struct efc *efc = node->efc; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + switch (evt) { + case EFC_EVT_ENTER: + efc_node_hold_frames(node); + break; + + case EFC_EVT_EXIT: + efc_node_accept_frames(node); + break; + + case EFC_EVT_DOMAIN_ATTACH_OK: { + struct efc_nport *nport = node->nport; + struct efc_node *rnode; + + /* + * this transient node (SID=0 (recv'd FLOGI) + * or DID=fabric (sent FLOGI)) + * is the p2p winner, will use a separate node + * to send PLOGI to peer + */ + WARN_ON(!node->nport->p2p_winner); + + rnode = efc_node_find(nport, node->nport->p2p_remote_port_id); + if (rnode) { + /* + * the "other" transient p2p node has + * already kicked off the + * new node from which PLOGI is sent + */ + node_printf(node, + "Node with fc_id x%x already exists\n", + rnode->rnode.fc_id); + } else { + /* + * create new node (SID=1, DID=2) + * from which to send PLOGI + */ + rnode = efc_node_alloc(nport, + nport->p2p_remote_port_id, + false, false); + if (!rnode) { + efc_log_err(efc, "node alloc failed\n"); + return; + } + + efc_fabric_notify_topology(node); + /* sm: / allocate p2p remote node */ + efc_node_transition(rnode, __efc_p2p_rnode_init, + NULL); + } + + /* + * the transient node (SID=0 or DID=fabric) + * has served its purpose + */ + if (node->rnode.fc_id == 0) { + /* + * if this is the SID=0 node, + * move to the init state in case peer + * has restarted FLOGI discovery and FLOGI is pending + */ + /* don't send PLOGI on efc_d_init entry */ + efc_node_init_device(node, false); + } else { + /* + * if this is the DID=fabric node + * (we initiated FLOGI), shut it down + */ + node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT; + efc_fabric_initiate_shutdown(node); + } + break; + } + + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +void +__efc_p2p_rnode_init(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node_cb *cbdata = arg; + struct efc_node *node = ctx->app; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + switch (evt) { + case EFC_EVT_ENTER: + /* sm: / send PLOGI */ + efc_send_plogi(node); + efc_node_transition(node, __efc_p2p_wait_plogi_rsp, NULL); + break; + + case EFC_EVT_ABTS_RCVD: + /* sm: send BA_ACC */ + efc_send_bls_acc(node, cbdata->header->dma.virt); + + break; + + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +void +__efc_p2p_wait_flogi_acc_cmpl(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node_cb *cbdata = arg; + struct efc_node *node = ctx->app; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + switch (evt) { + case EFC_EVT_ENTER: + efc_node_hold_frames(node); + break; + + case EFC_EVT_EXIT: + efc_node_accept_frames(node); + break; + + case EFC_EVT_SRRS_ELS_CMPL_OK: + WARN_ON(!node->els_cmpl_cnt); + node->els_cmpl_cnt--; + + /* sm: if p2p_winner / domain_attach */ + if (node->nport->p2p_winner) { + efc_node_transition(node, + __efc_p2p_wait_domain_attach, + NULL); + if (!node->nport->domain->attached) { + node_printf(node, "Domain not attached\n"); + efc_domain_attach(node->nport->domain, + node->nport->p2p_port_id); + } else { + node_printf(node, "Domain already attached\n"); + efc_node_post_event(node, + EFC_EVT_DOMAIN_ATTACH_OK, + NULL); + } + } else { + /* this node has served its purpose; + * we'll expect a PLOGI on a separate + * node (remote SID=0x1); return this node + * to init state in case peer + * restarts discovery -- it may already + * have (pending frames may exist). + */ + /* don't send PLOGI on efc_d_init entry */ + efc_node_init_device(node, false); + } + break; + + case EFC_EVT_SRRS_ELS_CMPL_FAIL: + /* + * LS_ACC failed, possibly due to link down; + * shutdown node and wait + * for FLOGI discovery to restart + */ + node_printf(node, "FLOGI LS_ACC failed, shutting down\n"); + WARN_ON(!node->els_cmpl_cnt); + node->els_cmpl_cnt--; + node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT; + efc_fabric_initiate_shutdown(node); + break; + + case EFC_EVT_ABTS_RCVD: { + /* sm: / send BA_ACC */ + efc_send_bls_acc(node, cbdata->header->dma.virt); + break; + } + + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +void +__efc_p2p_wait_plogi_rsp(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node_cb *cbdata = arg; + struct efc_node *node = ctx->app; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + switch (evt) { + case EFC_EVT_SRRS_ELS_REQ_OK: { + int rc; + + if (efc_node_check_els_req(ctx, evt, arg, ELS_PLOGI, + __efc_fabric_common, __func__)) { + return; + } + WARN_ON(!node->els_req_cnt); + node->els_req_cnt--; + /* sm: / save sparams, efc_node_attach */ + efc_node_save_sparms(node, cbdata->els_rsp.virt); + rc = efc_node_attach(node); + efc_node_transition(node, __efc_p2p_wait_node_attach, NULL); + if (rc < 0) + efc_node_post_event(node, EFC_EVT_NODE_ATTACH_FAIL, + NULL); + break; + } + case EFC_EVT_SRRS_ELS_REQ_FAIL: { + if (efc_node_check_els_req(ctx, evt, arg, ELS_PLOGI, + __efc_fabric_common, __func__)) { + return; + } + node_printf(node, "PLOGI failed, shutting down\n"); + WARN_ON(!node->els_req_cnt); + node->els_req_cnt--; + node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT; + efc_fabric_initiate_shutdown(node); + break; + } + + case EFC_EVT_PLOGI_RCVD: { + struct fc_frame_header *hdr = cbdata->header->dma.virt; + /* if we're in external loopback mode, just send LS_ACC */ + if (node->efc->external_loopback) { + efc_send_plogi_acc(node, be16_to_cpu(hdr->fh_ox_id)); + } else { + /* + * if this isn't external loopback, + * pass to default handler + */ + __efc_fabric_common(__func__, ctx, evt, arg); + } + break; + } + case EFC_EVT_PRLI_RCVD: + /* I, or I+T */ + /* sent PLOGI and before completion was seen, received the + * PRLI from the remote node (WCQEs and RCQEs come in on + * different queues and order of processing cannot be assumed) + * Save OXID so PRLI can be sent after the attach and continue + * to wait for PLOGI response + */ + efc_process_prli_payload(node, cbdata->payload->dma.virt); + efc_send_ls_acc_after_attach(node, + cbdata->header->dma.virt, + EFC_NODE_SEND_LS_ACC_PRLI); + efc_node_transition(node, __efc_p2p_wait_plogi_rsp_recvd_prli, + NULL); + break; + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +void +__efc_p2p_wait_plogi_rsp_recvd_prli(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node_cb *cbdata = arg; + struct efc_node *node = ctx->app; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + switch (evt) { + case EFC_EVT_ENTER: + /* + * Since we've received a PRLI, we have a port login and will + * just need to wait for the PLOGI response to do the node + * attach and then we can send the LS_ACC for the PRLI. If, + * during this time, we receive FCP_CMNDs (which is possible + * since we've already sent a PRLI and our peer may have + * accepted). + * At this time, we are not waiting on any other unsolicited + * frames to continue with the login process. Thus, it will not + * hurt to hold frames here. + */ + efc_node_hold_frames(node); + break; + + case EFC_EVT_EXIT: + efc_node_accept_frames(node); + break; + + case EFC_EVT_SRRS_ELS_REQ_OK: { /* PLOGI response received */ + int rc; + + /* Completion from PLOGI sent */ + if (efc_node_check_els_req(ctx, evt, arg, ELS_PLOGI, + __efc_fabric_common, __func__)) { + return; + } + WARN_ON(!node->els_req_cnt); + node->els_req_cnt--; + /* sm: / save sparams, efc_node_attach */ + efc_node_save_sparms(node, cbdata->els_rsp.virt); + rc = efc_node_attach(node); + efc_node_transition(node, __efc_p2p_wait_node_attach, NULL); + if (rc < 0) + efc_node_post_event(node, EFC_EVT_NODE_ATTACH_FAIL, + NULL); + break; + } + case EFC_EVT_SRRS_ELS_REQ_FAIL: /* PLOGI response received */ + case EFC_EVT_SRRS_ELS_REQ_RJT: + /* PLOGI failed, shutdown the node */ + if (efc_node_check_els_req(ctx, evt, arg, ELS_PLOGI, + __efc_fabric_common, __func__)) { + return; + } + WARN_ON(!node->els_req_cnt); + node->els_req_cnt--; + node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT; + efc_fabric_initiate_shutdown(node); + break; + + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +void +__efc_p2p_wait_node_attach(struct efc_sm_ctx *ctx, + enum efc_sm_event evt, void *arg) +{ + struct efc_node_cb *cbdata = arg; + struct efc_node *node = ctx->app; + + efc_node_evt_set(ctx, evt, __func__); + + node_sm_trace(); + + switch (evt) { + case EFC_EVT_ENTER: + efc_node_hold_frames(node); + break; + + case EFC_EVT_EXIT: + efc_node_accept_frames(node); + break; + + case EFC_EVT_NODE_ATTACH_OK: + node->attached = true; + switch (node->send_ls_acc) { + case EFC_NODE_SEND_LS_ACC_PRLI: { + efc_d_send_prli_rsp(node->ls_acc_io, + node->ls_acc_oxid); + node->send_ls_acc = EFC_NODE_SEND_LS_ACC_NONE; + node->ls_acc_io = NULL; + break; + } + case EFC_NODE_SEND_LS_ACC_PLOGI: /* Can't happen in P2P */ + case EFC_NODE_SEND_LS_ACC_NONE: + default: + /* Normal case for I */ + /* sm: send_plogi_acc is not set / send PLOGI acc */ + efc_node_transition(node, __efc_d_port_logged_in, + NULL); + break; + } + break; + + case EFC_EVT_NODE_ATTACH_FAIL: + /* node attach failed, shutdown the node */ + node->attached = false; + node_printf(node, "Node attach failed\n"); + node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT; + efc_fabric_initiate_shutdown(node); + break; + + case EFC_EVT_SHUTDOWN: + node_printf(node, "%s received\n", efc_sm_event_name(evt)); + node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT; + efc_node_transition(node, + __efc_fabric_wait_attach_evt_shutdown, + NULL); + break; + case EFC_EVT_PRLI_RCVD: + node_printf(node, "%s: PRLI received before node is attached\n", + efc_sm_event_name(evt)); + efc_process_prli_payload(node, cbdata->payload->dma.virt); + efc_send_ls_acc_after_attach(node, + cbdata->header->dma.virt, + EFC_NODE_SEND_LS_ACC_PRLI); + break; + + default: + __efc_fabric_common(__func__, ctx, evt, arg); + } +} + +int +efc_p2p_setup(struct efc_nport *nport) +{ + struct efc *efc = nport->efc; + int rnode_winner; + + rnode_winner = efc_rnode_is_winner(nport); + + /* set nport flags to indicate p2p "winner" */ + if (rnode_winner == 1) { + nport->p2p_remote_port_id = 0; + nport->p2p_port_id = 0; + nport->p2p_winner = false; + } else if (rnode_winner == 0) { + nport->p2p_remote_port_id = 2; + nport->p2p_port_id = 1; + nport->p2p_winner = true; + } else { + /* no winner; only okay if external loopback enabled */ + if (nport->efc->external_loopback) { + /* + * External loopback mode enabled; + * local nport and remote node + * will be registered with an NPortID = 1; + */ + efc_log_debug(efc, + "External loopback mode enabled\n"); + nport->p2p_remote_port_id = 1; + nport->p2p_port_id = 1; + nport->p2p_winner = true; + } else { + efc_log_warn(efc, + "failed to determine p2p winner\n"); + return rnode_winner; + } + } + return 0; +} |