lpfc: add support to generate RSCN events for nport
This patch adds general RSCN support: - The ability to transmit an RSCN to the port on the other end of the link (regular port if pt2pt, or fabric controller if fabric). - And general recognition of an RSCN ELS when an ELS is received. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Arun Easi <aeasi@marvell.com> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
James Smart
committed by
Christoph Hellwig
Christoph Hellwig
parent
4cf7c363b4
commit
f60cb93bbf
@@ -30,6 +30,8 @@
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_transport_fc.h>
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#include <uapi/scsi/fc/fc_fs.h>
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#include <uapi/scsi/fc/fc_els.h>
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#include "lpfc_hw4.h"
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#include "lpfc_hw.h"
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@@ -3078,6 +3080,116 @@ lpfc_issue_els_scr(struct lpfc_vport *vport, uint32_t nportid, uint8_t retry)
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return 0;
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}
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/**
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* lpfc_issue_els_rscn - Issue an RSCN to the Fabric Controller (Fabric)
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* or the other nport (pt2pt).
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* @vport: pointer to a host virtual N_Port data structure.
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* @retry: number of retries to the command IOCB.
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*
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* This routine issues a RSCN to the Fabric Controller (DID 0xFFFFFD)
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* when connected to a fabric, or to the remote port when connected
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* in point-to-point mode. When sent to the Fabric Controller, it will
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* replay the RSCN to registered recipients.
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*
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* Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
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* will be incremented by 1 for holding the ndlp and the reference to ndlp
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* will be stored into the context1 field of the IOCB for the completion
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* callback function to the RSCN ELS command.
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*
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* Return code
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* 0 - Successfully issued RSCN command
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* 1 - Failed to issue RSCN command
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**/
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int
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lpfc_issue_els_rscn(struct lpfc_vport *vport, uint8_t retry)
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{
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struct lpfc_hba *phba = vport->phba;
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struct lpfc_iocbq *elsiocb;
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struct lpfc_nodelist *ndlp;
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struct {
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struct fc_els_rscn rscn;
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struct fc_els_rscn_page portid;
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} *event;
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uint32_t nportid;
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uint16_t cmdsize = sizeof(*event);
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/* Not supported for private loop */
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if (phba->fc_topology == LPFC_TOPOLOGY_LOOP &&
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!(vport->fc_flag & FC_PUBLIC_LOOP))
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return 1;
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if (vport->fc_flag & FC_PT2PT) {
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/* find any mapped nport - that would be the other nport */
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ndlp = lpfc_findnode_mapped(vport);
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if (!ndlp)
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return 1;
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} else {
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nportid = FC_FID_FCTRL;
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/* find the fabric controller node */
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ndlp = lpfc_findnode_did(vport, nportid);
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if (!ndlp) {
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/* if one didn't exist, make one */
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ndlp = lpfc_nlp_init(vport, nportid);
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if (!ndlp)
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return 1;
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lpfc_enqueue_node(vport, ndlp);
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} else if (!NLP_CHK_NODE_ACT(ndlp)) {
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ndlp = lpfc_enable_node(vport, ndlp,
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NLP_STE_UNUSED_NODE);
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if (!ndlp)
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return 1;
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}
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}
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elsiocb = lpfc_prep_els_iocb(vport, 1, cmdsize, retry, ndlp,
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ndlp->nlp_DID, ELS_CMD_RSCN_XMT);
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if (!elsiocb) {
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/* This will trigger the release of the node just
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* allocated
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*/
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lpfc_nlp_put(ndlp);
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return 1;
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}
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event = ((struct lpfc_dmabuf *)elsiocb->context2)->virt;
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event->rscn.rscn_cmd = ELS_RSCN;
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event->rscn.rscn_page_len = sizeof(struct fc_els_rscn_page);
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event->rscn.rscn_plen = cpu_to_be16(cmdsize);
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nportid = vport->fc_myDID;
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/* appears that page flags must be 0 for fabric to broadcast RSCN */
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event->portid.rscn_page_flags = 0;
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event->portid.rscn_fid[0] = (nportid & 0x00FF0000) >> 16;
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event->portid.rscn_fid[1] = (nportid & 0x0000FF00) >> 8;
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event->portid.rscn_fid[2] = nportid & 0x000000FF;
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lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
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"Issue RSCN: did:x%x",
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ndlp->nlp_DID, 0, 0);
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phba->fc_stat.elsXmitRSCN++;
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elsiocb->iocb_cmpl = lpfc_cmpl_els_cmd;
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if (lpfc_sli_issue_iocb(phba, LPFC_ELS_RING, elsiocb, 0) ==
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IOCB_ERROR) {
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/* The additional lpfc_nlp_put will cause the following
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* lpfc_els_free_iocb routine to trigger the rlease of
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* the node.
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*/
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lpfc_nlp_put(ndlp);
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lpfc_els_free_iocb(phba, elsiocb);
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return 1;
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}
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/* This will cause the callback-function lpfc_cmpl_els_cmd to
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* trigger the release of node.
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*/
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if (!(vport->fc_flag & FC_PT2PT))
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lpfc_nlp_put(ndlp);
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return 0;
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}
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/**
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* lpfc_issue_els_farpr - Issue a farp to an node on a vport
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* @vport: pointer to a host virtual N_Port data structure.
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@@ -6318,6 +6430,16 @@ lpfc_els_rcv_rscn(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
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fc_host_post_event(shost, fc_get_event_number(),
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FCH_EVT_RSCN, lp[i]);
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/* Check if RSCN is coming from a direct-connected remote NPort */
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if (vport->fc_flag & FC_PT2PT) {
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/* If so, just ACC it, no other action needed for now */
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lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
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"2024 pt2pt RSCN %08x Data: x%x x%x\n",
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*lp, vport->fc_flag, payload_len);
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lpfc_els_rsp_acc(vport, ELS_CMD_ACC, cmdiocb, ndlp, NULL);
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return 0;
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}
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/* If we are about to begin discovery, just ACC the RSCN.
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* Discovery processing will satisfy it.
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*/
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