From: Hannes Reinecke <[email protected]> Add a callback nvme_fc_fpin_rcv() to evaluate the FPIN LI TLV information and set the 'marginal' path status for all affected rports.
Signed-off-by: Hannes Reinecke <[email protected]> Tested-by: Bryan Gurney <[email protected]> Reviewed-by: John Meneghini <[email protected]> Tested-by: Muneendra Kumar <[email protected]> --- drivers/nvme/host/fc.c | 95 ++++++++++++++++++++++++++++++++++ include/linux/nvme-fc-driver.h | 3 ++ 2 files changed, 98 insertions(+) diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c index bf6188b554ce..a640310f1424 100644 --- a/drivers/nvme/host/fc.c +++ b/drivers/nvme/host/fc.c @@ -3724,6 +3724,101 @@ static struct nvmf_transport_ops nvme_fc_transport = { .create_ctrl = nvme_fc_create_ctrl, }; +static struct nvme_fc_rport *nvme_fc_rport_from_wwpn(struct nvme_fc_lport *lport, + u64 rport_wwpn) +{ + struct nvme_fc_rport *rport; + + list_for_each_entry(rport, &lport->endp_list, endp_list) { + if (!nvme_fc_rport_get(rport)) + continue; + if (rport->remoteport.port_name == rport_wwpn && + rport->remoteport.port_role & FC_PORT_ROLE_NVME_TARGET) + return rport; + nvme_fc_rport_put(rport); + } + return NULL; +} + +static void +nvme_fc_fpin_li_lport_update(struct nvme_fc_lport *lport, struct fc_fn_li_desc *li) +{ + unsigned int i, pname_count = be32_to_cpu(li->pname_count); + u64 attached_wwpn = be64_to_cpu(li->attached_wwpn); + struct nvme_fc_rport *attached_rport; + + for (i = 0; i < pname_count; i++) { + struct nvme_fc_rport *rport; + u64 wwpn = be64_to_cpu(li->pname_list[i]); + + rport = nvme_fc_rport_from_wwpn(lport, wwpn); + if (!rport) + continue; + if (wwpn != attached_wwpn) { + struct nvme_fc_ctrl *ctrl; + + spin_lock_irq(&rport->lock); + list_for_each_entry(ctrl, &rport->ctrl_list, ctrl_list) + set_bit(NVME_CTRL_MARGINAL, &ctrl->ctrl.flags); + spin_unlock_irq(&rport->lock); + } + nvme_fc_rport_put(rport); + } + + attached_rport = nvme_fc_rport_from_wwpn(lport, attached_wwpn); + if (attached_rport) { + struct nvme_fc_ctrl *ctrl; + + spin_lock_irq(&attached_rport->lock); + list_for_each_entry(ctrl, &attached_rport->ctrl_list, ctrl_list) + set_bit(NVME_CTRL_MARGINAL, &ctrl->ctrl.flags); + spin_unlock_irq(&attached_rport->lock); + nvme_fc_rport_put(attached_rport); + } +} + +/** + * fc_host_fpin_rcv() - Process a received FPIN. + * @localport: local port the FPIN was received on + * @fpin_len: length of FPIN payload, in bytes + * @fpin_buf: pointer to FPIN payload + * Notes: + * This routine assumes no locks are held on entry. + */ +void +nvme_fc_fpin_rcv(struct nvme_fc_local_port *localport, + u32 fpin_len, char *fpin_buf) +{ + struct nvme_fc_lport *lport; + struct fc_els_fpin *fpin = (struct fc_els_fpin *)fpin_buf; + union fc_tlv_desc *tlv; + u32 bytes_remain; + u32 dtag; + + if (!localport) + return; + lport = localport_to_lport(localport); + 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: + nvme_fc_fpin_li_lport_update(lport, &tlv->li); + break; + default: + break; + } + + bytes_remain -= FC_TLV_DESC_SZ_FROM_LENGTH(tlv); + tlv = fc_tlv_next_desc(tlv); + } +} +EXPORT_SYMBOL(nvme_fc_fpin_rcv); + /* Arbitrary successive failures max. With lots of subsystems could be high */ #define DISCOVERY_MAX_FAIL 20 diff --git a/include/linux/nvme-fc-driver.h b/include/linux/nvme-fc-driver.h index 9f6acadfe0c8..bcd3b1e5a256 100644 --- a/include/linux/nvme-fc-driver.h +++ b/include/linux/nvme-fc-driver.h @@ -536,6 +536,9 @@ void nvme_fc_rescan_remoteport(struct nvme_fc_remote_port *remoteport); int nvme_fc_set_remoteport_devloss(struct nvme_fc_remote_port *remoteport, u32 dev_loss_tmo); +void nvme_fc_fpin_rcv(struct nvme_fc_local_port *localport, + u32 fpin_len, char *fpin_buf); + /* * Routine called to pass a NVME-FC LS request, received by the lldd, * to the nvme-fc transport. -- 2.50.1
