Add fc_host_fpin_set_nvme_rport_marginal() function to evaluate the FPIN LI TLV information and set the 'marginal' path status for all affected nvme rports.
Co-developed-by: Hannes Reinecke <[email protected]> Signed-off-by: Hannes Reinecke <[email protected]> Tested-by: Bryan Gurney <[email protected]> Signed-off-by: John Meneghini <[email protected]> --- drivers/scsi/scsi_transport_fc.c | 81 ++++++++++++++++++++++++++++++++ include/scsi/scsi_transport_fc.h | 1 + 2 files changed, 82 insertions(+) diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c index f31fdc840191..4dc03cbaf3e2 100644 --- a/drivers/scsi/scsi_transport_fc.c +++ b/drivers/scsi/scsi_transport_fc.c @@ -25,6 +25,10 @@ #include <uapi/scsi/fc/fc_els.h> #include "scsi_priv.h" +#if (IS_ENABLED(CONFIG_NVME_FC)) +void nvme_fc_modify_rport_fpin_state(u64 local_wwpn, u64 remote_wwpn, bool marginal); +#endif + static int fc_queue_work(struct Scsi_Host *, struct work_struct *); static void fc_vport_sched_delete(struct work_struct *work); static int fc_vport_setup(struct Scsi_Host *shost, int channel, @@ -873,6 +877,83 @@ fc_fpin_congn_stats_update(struct Scsi_Host *shost, &fc_host->fpin_stats); } +/** + * fc_host_fpin_set_nvme_rport_marginal + * - Set FC_PORTSTATE_MARGINAL for nvme rports in FPIN + * @shost: host the FPIN was received on + * @fpin_len: length of FPIN payload, in bytes + * @fpin_buf: pointer to FPIN payload + * + * This function processes a received FPIN and sets FC_PORTSTATE_MARGINAL on + * all remote ports that have FC_PORT_ROLE_NVME_TARGET set identified in the + * FPIN descriptors. + * + * Notes: + * This routine assumes no locks are held on entry. + */ +void +fc_host_fpin_set_nvme_rport_marginal(struct Scsi_Host *shost, u32 fpin_len, char *fpin_buf) +{ + struct fc_els_fpin *fpin = (struct fc_els_fpin *)fpin_buf; + struct fc_rport *rport; + union fc_tlv_desc *tlv; + u64 local_wwpn = fc_host_port_name(shost); + u64 wwpn, attached_wwpn; + u32 bytes_remain; + u32 dtag; + u8 i; + unsigned long flags; + + /* Parse FPIN descriptors */ + tlv = &fpin->fpin_desc[0]; + bytes_remain = fpin_len - offsetof(struct fc_els_fpin, fpin_desc); + bytes_remain = min_t(u32, bytes_remain, be32_to_cpu(fpin->desc_len)); + + while (bytes_remain >= FC_TLV_DESC_HDR_SZ && + bytes_remain >= FC_TLV_DESC_SZ_FROM_LENGTH(tlv)) { + dtag = be32_to_cpu(tlv->hdr.desc_tag); + switch (dtag) { + case ELS_DTAG_LNK_INTEGRITY: + struct fc_fn_li_desc *li_desc = &tlv->li; + + attached_wwpn = be64_to_cpu(li_desc->attached_wwpn); + + /* Set marginal state for WWPNs in pname_list */ + if (be32_to_cpu(li_desc->pname_count) > 0) { + for (i = 0; i < be32_to_cpu(li_desc->pname_count); i++) { + wwpn = be64_to_cpu(li_desc->pname_list[i]); + if (wwpn == attached_wwpn) + continue; + + rport = fc_find_rport_by_wwpn(shost, wwpn); + if (!rport) + continue; + + spin_lock_irqsave(shost->host_lock, flags); + + if (rport->port_state == FC_PORTSTATE_ONLINE && + rport->roles & FC_PORT_ROLE_NVME_TARGET) { + rport->port_state = FC_PORTSTATE_MARGINAL; + spin_unlock_irqrestore(shost->host_lock, flags); +#if (IS_ENABLED(CONFIG_NVME_FC)) + nvme_fc_modify_rport_fpin_state(local_wwpn, + wwpn, true); +#endif + } else + spin_unlock_irqrestore(shost->host_lock, flags); + + } + } + break; + default: + break; + } + bytes_remain -= FC_TLV_DESC_SZ_FROM_LENGTH(tlv); + tlv = fc_tlv_next_desc(tlv); + } +} +EXPORT_SYMBOL(fc_host_fpin_set_nvme_rport_marginal); + /** * fc_host_fpin_rcv - routine to process a received FPIN. * @shost: host the FPIN was received on diff --git a/include/scsi/scsi_transport_fc.h b/include/scsi/scsi_transport_fc.h index b908aacfef48..e8d46b71bada 100644 --- a/include/scsi/scsi_transport_fc.h +++ b/include/scsi/scsi_transport_fc.h @@ -852,6 +852,7 @@ void fc_host_post_fc_event(struct Scsi_Host *shost, u32 event_number, */ void fc_host_fpin_rcv(struct Scsi_Host *shost, u32 fpin_len, char *fpin_buf, u8 event_acknowledge); +void fc_host_fpin_set_nvme_rport_marginal(struct Scsi_Host *shost, u32 fpin_len, char *fpin_buf); struct fc_vport *fc_vport_create(struct Scsi_Host *shost, int channel, struct fc_vport_identifiers *); int fc_vport_terminate(struct fc_vport *vport); -- 2.51.0
