// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2021 Broadcom. All Rights Reserved. The term * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.
*/
/* * device_sm Node State Machine: Remote Device States
*/
/* * State is entered when a node sends a delete initiator/target call * to the target-server/initiator-client and needs to wait for that * work to complete.
*/
node_sm_trace();
switch (evt) { case EFC_EVT_ENTER:
efc_node_hold_frames(node);
fallthrough;
case EFC_EVT_NODE_ACTIVE_IO_LIST_EMPTY: case EFC_EVT_ALL_CHILD_NODES_FREE: /* These are expected events. */ break;
case EFC_EVT_NODE_DEL_INI_COMPLETE: case EFC_EVT_NODE_DEL_TGT_COMPLETE: /* * 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); break;
case EFC_EVT_EXIT:
efc_node_accept_frames(node); break;
case EFC_EVT_SRRS_ELS_REQ_FAIL: /* Can happen as ELS IO IO's complete */
WARN_ON(!node->els_req_cnt);
node->els_req_cnt--; break;
/* ignore shutdown events as we're already in shutdown path */ case EFC_EVT_SHUTDOWN: /* have default shutdown event take precedence */
node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT;
fallthrough;
case EFC_EVT_SHUTDOWN_EXPLICIT_LOGO: case EFC_EVT_SHUTDOWN_IMPLICIT_LOGO:
node_printf(node, "%s received\n", efc_sm_event_name(evt)); break; case EFC_EVT_DOMAIN_ATTACH_OK: /* don't care about domain_attach_ok */ break; default:
__efc_d_common(__func__, ctx, evt, arg);
}
}
switch (evt) { case EFC_EVT_ENTER:
efc_node_hold_frames(node);
fallthrough;
case EFC_EVT_NODE_ACTIVE_IO_LIST_EMPTY: case EFC_EVT_ALL_CHILD_NODES_FREE: /* These are expected events. */ break;
case EFC_EVT_NODE_DEL_INI_COMPLETE: case EFC_EVT_NODE_DEL_TGT_COMPLETE:
efc_node_transition(node, __efc_d_wait_del_node, NULL); break;
case EFC_EVT_EXIT:
efc_node_accept_frames(node); break;
case EFC_EVT_SRRS_ELS_REQ_FAIL: /* Can happen as ELS IO IO's complete */
WARN_ON(!node->els_req_cnt);
node->els_req_cnt--; break;
/* ignore shutdown events as we're already in shutdown path */ case EFC_EVT_SHUTDOWN: /* have default shutdown event take precedence */
node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT;
fallthrough;
case EFC_EVT_SHUTDOWN_EXPLICIT_LOGO: case EFC_EVT_SHUTDOWN_IMPLICIT_LOGO:
node_printf(node, "%s received\n", efc_sm_event_name(evt)); break; case EFC_EVT_DOMAIN_ATTACH_OK: /* don't care about domain_attach_ok */ break; default:
__efc_d_common(__func__, ctx, evt, arg);
}
}
if (rc == EFC_SCSI_CALL_COMPLETE)
efc_node_post_event(node,
EFC_EVT_NODE_DEL_INI_COMPLETE, NULL); /* assume no wait needed */
rc = EFC_SCSI_CALL_COMPLETE; if (node->nport->enable_ini)
rc = efc->tt.scsi_del_node(efc, node,
EFC_SCSI_TARGET_DELETED);
if (rc == EFC_SCSI_CALL_COMPLETE)
efc_node_post_event(node,
EFC_EVT_NODE_DEL_TGT_COMPLETE, NULL);
}
/* we've initiated the upcalls as needed, now kick off the node * detach to precipitate the aborting of outstanding exchanges * associated with said node * * Beware: if we've made upcall(s), we've already transitioned * to a new state by the time we execute this. * consider doing this before the upcalls?
*/ if (node->attached) { /* 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);
}
/* if neither initiator nor target, proceed to cleanup */ if (!node->init && !node->targ) { /* * 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);
} break;
} case EFC_EVT_ALL_CHILD_NODES_FREE: /* Ignore, this can happen if an ELS is * aborted while in a delay/retry state
*/ break; default:
__efc_d_common(__func__, ctx, evt, arg);
}
}
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_REQ_OK: case EFC_EVT_SRRS_ELS_REQ_RJT: case EFC_EVT_SRRS_ELS_REQ_FAIL: /* LOGO response received, sent shutdown */ if (efc_node_check_els_req(ctx, evt, arg, ELS_LOGO,
__efc_d_common, __func__)) return;
WARN_ON(!node->els_req_cnt);
node->els_req_cnt--;
node_printf(node, "LOGO sent (evt=%s), shutdown node\n",
efc_sm_event_name(evt)); /* sm: / post explicit logout */
efc_node_post_event(node, EFC_EVT_SHUTDOWN_EXPLICIT_LOGO,
NULL); break;
staticvoid
efc_d_check_plogi_topology(struct efc_node *node, u32 d_id)
{ switch (node->nport->topology) { case EFC_NPORT_TOPO_P2P: /* we're not attached and nport is p2p, * need to attach
*/
efc_domain_attach(node->nport->domain, d_id);
efc_node_transition(node, __efc_d_wait_domain_attach, NULL); break; case EFC_NPORT_TOPO_FABRIC: /* we're not attached and nport is fabric, domain * attach should have already been requested as part * of the fabric state machine, wait for it
*/
efc_node_transition(node, __efc_d_wait_domain_attach, NULL); break; case EFC_NPORT_TOPO_UNKNOWN: /* Two possibilities: * 1. received a PLOGI before our FLOGI has completed * (possible since completion comes in on another * CQ), thus we don't know what we're connected to * yet; transition to a state to wait for the * fabric node to tell us; * 2. PLOGI received before link went down and we * haven't performed domain attach yet. * Note: we cannot distinguish between 1. and 2. * so have to assume PLOGI * was received after link back up.
*/
node_printf(node, "received PLOGI, unknown topology did=0x%x\n",
d_id);
efc_node_transition(node, __efc_d_wait_topology_notify, NULL); break; default:
node_printf(node, "received PLOGI, unexpected topology %d\n",
node->nport->topology);
}
}
/* * This state is entered when a node is instantiated, * either having been discovered from a name services query, * or having received a PLOGI/FLOGI.
*/ switch (evt) { case EFC_EVT_ENTER: if (!node->send_plogi) break; /* only send if we have initiator capability, * and domain is attached
*/ if (node->nport->enable_ini &&
node->nport->domain->attached) {
efc_send_plogi(node);
/* domain not attached; several possibilities: */ if (!node->nport->domain->attached) {
efc_d_check_plogi_topology(node, ntoh24(hdr->fh_d_id)); break;
}
case EFC_EVT_LOGO_RCVD: { struct fc_frame_header *hdr = cbdata->header->dma.virt;
if (!node->nport->domain->attached) { /* most likely a frame left over from before a link * down; drop and * shut node down w/ "explicit logout" so pending * frames are processed
*/
node_printf(node, "%s domain not attached, dropping\n",
efc_sm_event_name(evt));
efc_node_post_event(node,
EFC_EVT_SHUTDOWN_EXPLICIT_LOGO, NULL); break;
}
case EFC_EVT_PRLI_RCVD: case EFC_EVT_PRLO_RCVD: case EFC_EVT_PDISC_RCVD: case EFC_EVT_ADISC_RCVD: case EFC_EVT_RSCN_RCVD: { struct fc_frame_header *hdr = cbdata->header->dma.virt;
if (!node->nport->domain->attached) { /* most likely a frame left over from before a link * down; drop and shut node down w/ "explicit logout" * so pending frames are processed
*/
node_printf(node, "%s domain not attached, dropping\n",
efc_sm_event_name(evt));
case EFC_EVT_FCP_CMD_RCVD: { /* note: problem, we're now expecting an ELS REQ completion * from both the LOGO and PLOGI
*/ if (!node->nport->domain->attached) { /* most likely a frame left over from before a * link down; drop and * shut node down w/ "explicit logout" so pending * frames are processed
*/
node_printf(node, "%s domain not attached, dropping\n",
efc_sm_event_name(evt));
efc_node_post_event(node,
EFC_EVT_SHUTDOWN_EXPLICIT_LOGO,
NULL); break;
}
/* Send LOGO */
node_printf(node, "FCP_CMND received, send LOGO\n"); if (efc_send_logo(node)) { /* * failed to send LOGO, go ahead and cleanup node * anyways
*/
node_printf(node, "Failed to send LOGO\n");
efc_node_post_event(node,
EFC_EVT_SHUTDOWN_EXPLICIT_LOGO,
NULL);
} else { /* sent LOGO, wait for response */
efc_node_transition(node,
__efc_d_wait_logo_rsp, NULL);
} break;
} case EFC_EVT_DOMAIN_ATTACH_OK: /* don't care about domain_attach_ok */ break;
switch (evt) { case EFC_EVT_PLOGI_RCVD: { /* T, or I+T */ /* received PLOGI with svc parms, go ahead and attach node * when PLOGI that was sent ultimately completes, it'll be a * no-op * * If there is an outstanding PLOGI sent, can we set a flag * to indicate that we don't want to retry it if it times out?
*/
efc_node_save_sparms(node, cbdata->payload->dma.virt);
efc_send_ls_acc_after_attach(node,
cbdata->header->dma.virt,
EFC_NODE_SEND_LS_ACC_PLOGI); /* sm: domain->attached / efc_node_attach */
rc = efc_node_attach(node);
efc_node_transition(node, __efc_d_wait_node_attach, NULL); if (rc < 0)
efc_node_post_event(node,
EFC_EVT_NODE_ATTACH_FAIL, NULL);
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_d_wait_plogi_rsp_recvd_prli,
NULL); break;
case EFC_EVT_LOGO_RCVD: /* why don't we do a shutdown here?? */ case EFC_EVT_PRLO_RCVD: case EFC_EVT_PDISC_RCVD: case EFC_EVT_FDISC_RCVD: case EFC_EVT_ADISC_RCVD: case EFC_EVT_RSCN_RCVD: case EFC_EVT_SCR_RCVD: { struct fc_frame_header *hdr = cbdata->header->dma.virt;
case EFC_EVT_SRRS_ELS_REQ_OK: /* PLOGI response received */ /* Completion from PLOGI sent */ if (efc_node_check_els_req(ctx, evt, arg, ELS_PLOGI,
__efc_d_common, __func__)) return;
case EFC_EVT_SRRS_ELS_REQ_RJT: /* Our PLOGI was rejected, this is ok in some cases */ if (efc_node_check_els_req(ctx, evt, arg, ELS_PLOGI,
__efc_d_common, __func__)) return;
case EFC_EVT_FCP_CMD_RCVD: { /* not logged in yet and outstanding PLOGI so don't send LOGO, * just drop
*/
node_printf(node, "FCP_CMND received, drop\n"); break;
}
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 */ /* Completion from PLOGI sent */ if (efc_node_check_els_req(ctx, evt, arg, ELS_PLOGI,
__efc_d_common, __func__)) return;
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_d_common, __func__)) return;
/* At the time the PLOGI was received, the topology was unknown, * so we didn't know which node would perform the domain attach: * 1. The node from which the PLOGI was sent (p2p) or * 2. The node to which the FLOGI was sent (fabric).
*/ if (*topology == EFC_NPORT_TOPO_P2P) { /* if this is p2p, need to attach to the domain using * the d_id from the PLOGI received
*/
efc_domain_attach(node->nport->domain,
node->ls_acc_did);
} /* else, if this is fabric, the domain attach * should be performed by the fabric node (node sending FLOGI); * just wait for attach to complete
*/
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_PLOGI: { /* sm: send_plogi_acc is set / send PLOGI acc */ /* Normal case for T, or I+T */
efc_send_plogi_acc(node, node->ls_acc_oxid);
efc_node_transition(node, __efc_d_wait_plogi_acc_cmpl,
NULL);
node->send_ls_acc = EFC_NODE_SEND_LS_ACC_NONE;
node->ls_acc_io = NULL; break;
} case EFC_NODE_SEND_LS_ACC_PRLI: {
efc_d_send_prli_rsp(node, 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_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;
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_node_transition(node, __efc_d_initiate_shutdown, NULL); break;
case EFC_EVT_NODE_ATTACH_FAIL: /* node attach failed, shutdown the node */
node->attached = false;
node_printf(node, "Attach evt=%s, proceed to shutdown\n",
efc_sm_event_name(evt));
efc_node_transition(node, __efc_d_initiate_shutdown, NULL); break;
/* ignore shutdown events as we're already in shutdown path */ case EFC_EVT_SHUTDOWN: /* have default shutdown event take precedence */
node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT;
fallthrough;
case EFC_EVT_SHUTDOWN_EXPLICIT_LOGO: case EFC_EVT_SHUTDOWN_IMPLICIT_LOGO:
node_printf(node, "%s received\n", efc_sm_event_name(evt)); break;
switch (evt) { case EFC_EVT_ENTER: /* Normal case for I or I+T */ if (node->nport->enable_ini &&
!(node->rnode.fc_id != FC_FID_DOM_MGR)) { /* sm: if enable_ini / send PRLI */
efc_send_prli(node); /* can now expect ELS_REQ_OK/FAIL/RJT */
} break;
case EFC_EVT_FCP_CMD_RCVD: { break;
}
case EFC_EVT_PRLI_RCVD: { /* Normal case for T or I+T */ struct fc_frame_header *hdr = cbdata->header->dma.virt; struct { struct fc_els_prli prli; struct fc_els_spp sp;
} *pp;
pp = cbdata->payload->dma.virt; if (pp->sp.spp_type != FC_TYPE_FCP) { /*Only FCP is supported*/
efc_send_ls_rjt(node, be16_to_cpu(hdr->fh_ox_id),
ELS_RJT_UNAB, ELS_EXPL_UNSUPR, 0); break;
}
case EFC_EVT_SRRS_ELS_REQ_OK: { /* PRLI response */ /* Normal case for I or I+T */ if (efc_node_check_els_req(ctx, evt, arg, ELS_PRLI,
__efc_d_common, __func__)) return;
case EFC_EVT_SRRS_ELS_REQ_RJT: { /* PRLI rejected by remote * Normal for I, I+T (connected to an I) * Node doesn't want to be a target, stay here and wait for a * PRLI from the remote node * if it really wants to connect to us as target
*/ if (efc_node_check_els_req(ctx, evt, arg, ELS_PRLI,
__efc_d_common, __func__)) return;
case EFC_EVT_SRRS_ELS_CMPL_OK: { /* Normal T, I+T, target-server rejected the process login */ /* This would be received only in the case where we sent * LS_RJT for the PRLI, so * do nothing. (note: as T only we could shutdown the node)
*/
WARN_ON(!node->els_cmpl_cnt);
node->els_cmpl_cnt--; break;
}
case EFC_EVT_PLOGI_RCVD: { /*sm: / save sparams, set send_plogi_acc, *post implicit logout * Save plogi parameters
*/
efc_node_save_sparms(node, cbdata->payload->dma.virt);
efc_send_ls_acc_after_attach(node,
cbdata->header->dma.virt,
EFC_NODE_SEND_LS_ACC_PLOGI);
/* Restart node attach with new service parameters, * and send ACC
*/
efc_node_post_event(node, EFC_EVT_SHUTDOWN_IMPLICIT_LOGO,
NULL); break;
}
case EFC_EVT_LOGO_RCVD: { /* I, T, I+T */ struct fc_frame_header *hdr = cbdata->header->dma.virt;
node_printf(node, "%s received attached=%d\n",
efc_sm_event_name(evt),
node->attached); /* sm: / send LOGO acc */
efc_send_logo_acc(node, be16_to_cpu(hdr->fh_ox_id));
efc_node_transition(node, __efc_d_wait_logo_acc_cmpl, NULL); break;
}
switch (evt) { case EFC_EVT_ENTER:
node->fcp_enabled = true; if (node->targ) {
efc_log_info(efc, "[%s] found (target) WWPN %s WWNN %s\n",
node->display_name,
node->wwpn, node->wwnn); if (node->nport->enable_ini)
efc->tt.scsi_new_node(efc, node);
} break;
case EFC_EVT_EXIT:
node->fcp_enabled = false; break;
case EFC_EVT_PLOGI_RCVD: { /* sm: / save sparams, set send_plogi_acc, post implicit * logout * Save plogi parameters
*/
efc_node_save_sparms(node, cbdata->payload->dma.virt);
efc_send_ls_acc_after_attach(node,
cbdata->header->dma.virt,
EFC_NODE_SEND_LS_ACC_PLOGI);
/* * Restart node attach with new service parameters, * and send ACC
*/
efc_node_post_event(node,
EFC_EVT_SHUTDOWN_IMPLICIT_LOGO, NULL); break;
}
case EFC_EVT_PRLI_RCVD: { /* T, I+T: remote initiator is slow to get started */ struct fc_frame_header *hdr = cbdata->header->dma.virt; struct { struct fc_els_prli prli; struct fc_els_spp sp;
} *pp;
pp = cbdata->payload->dma.virt; if (pp->sp.spp_type != FC_TYPE_FCP) { /*Only FCP is supported*/
efc_send_ls_rjt(node, be16_to_cpu(hdr->fh_ox_id),
ELS_RJT_UNAB, ELS_EXPL_UNSUPR, 0); break;
}
switch (efc_node_get_enable(node)) { case EFC_NODE_ENABLE_T_TO_T: case EFC_NODE_ENABLE_I_TO_T: case EFC_NODE_ENABLE_IT_TO_T:
rc = efc->tt.scsi_del_node(efc, node,
EFC_SCSI_TARGET_MISSING); break;
case EFC_NODE_ENABLE_T_TO_I: case EFC_NODE_ENABLE_I_TO_I: case EFC_NODE_ENABLE_IT_TO_I:
rc = efc->tt.scsi_del_node(efc, node,
EFC_SCSI_INITIATOR_MISSING); break;
case EFC_NODE_ENABLE_T_TO_IT:
rc = efc->tt.scsi_del_node(efc, node,
EFC_SCSI_INITIATOR_MISSING); break;
case EFC_NODE_ENABLE_I_TO_IT:
rc = efc->tt.scsi_del_node(efc, node,
EFC_SCSI_TARGET_MISSING); break;
case EFC_EVT_PLOGI_RCVD: { /* sm: / save sparams, set send_plogi_acc, post implicit * logout * Save plogi parameters
*/
efc_node_save_sparms(node, cbdata->payload->dma.virt);
efc_send_ls_acc_after_attach(node,
cbdata->header->dma.virt,
EFC_NODE_SEND_LS_ACC_PLOGI);
/* * Restart node attach with new service parameters, and send * ACC
*/
efc_node_post_event(node, EFC_EVT_SHUTDOWN_IMPLICIT_LOGO,
NULL); break;
}
case EFC_EVT_FCP_CMD_RCVD: { /* most likely a stale frame (received prior to link down), * if attempt to send LOGO, will probably timeout and eat * up 20s; thus, drop FCP_CMND
*/
node_printf(node, "FCP_CMND received, drop\n"); break;
} case EFC_EVT_LOGO_RCVD: { /* I, T, I+T */ struct fc_frame_header *hdr = cbdata->header->dma.virt;
case EFC_EVT_SRRS_ELS_REQ_RJT: /* received an LS_RJT, in this case, send shutdown * (explicit logo) event which will unregister the node, * and start over with PLOGI
*/ if (efc_node_check_els_req(ctx, evt, arg, ELS_ADISC,
__efc_d_common, __func__)) return;
case EFC_EVT_LOGO_RCVD: { /* In this case, we have the equivalent of an LS_RJT for * the ADISC, so we need to abort the ADISC, and re-login * with PLOGI
*/ /* sm: / request abort, send LOGO acc */ struct fc_frame_header *hdr = cbdata->header->dma.virt;
node_printf(node, "%s received attached=%d\n",
efc_sm_event_name(evt), node->attached);
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