scsi: fc: Parse FPIN packets and update statistics
Parse the incoming FPIN packets and update the host and rport FPIN statistics based on the FPINs. Link: https://lore.kernel.org/r/20201021092715.22669-4-njavali@marvell.com Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com> Reviewed-by: James Smart <james.smart@broadcom.com> Signed-off-by: Shyam Sundar <ssundar@marvell.com> Signed-off-by: Nilesh Javali <njavali@marvell.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Shyam Sundar
Martin K. Petersen
Родитель
547aab51a9
Коммит
3dcfe0de5a
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@ -34,6 +34,11 @@ static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
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static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
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static void fc_bsg_remove(struct request_queue *);
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static void fc_bsg_goose_queue(struct fc_rport *);
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static void fc_li_stats_update(struct fc_fn_li_desc *li_desc,
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struct fc_fpin_stats *stats);
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static void fc_delivery_stats_update(u32 reason_code,
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struct fc_fpin_stats *stats);
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static void fc_cn_stats_update(u16 event_type, struct fc_fpin_stats *stats);
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/*
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* Module Parameters
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@ -630,6 +635,262 @@ fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
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}
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EXPORT_SYMBOL(fc_host_post_vendor_event);
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/**
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* fc_find_rport_by_wwpn - find the fc_rport pointer for a given wwpn
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* @shost: host the fc_rport is associated with
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* @wwpn: wwpn of the fc_rport device
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*
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* Notes:
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* This routine assumes no locks are held on entry.
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*/
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struct fc_rport *
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fc_find_rport_by_wwpn(struct Scsi_Host *shost, u64 wwpn)
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{
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struct fc_rport *rport;
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unsigned long flags;
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spin_lock_irqsave(shost->host_lock, flags);
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list_for_each_entry(rport, &fc_host_rports(shost), peers) {
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if (rport->port_state != FC_PORTSTATE_ONLINE)
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continue;
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if (rport->port_name == wwpn) {
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spin_unlock_irqrestore(shost->host_lock, flags);
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return rport;
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}
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}
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spin_unlock_irqrestore(shost->host_lock, flags);
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return NULL;
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}
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EXPORT_SYMBOL(fc_find_rport_by_wwpn);
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static void
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fc_li_stats_update(struct fc_fn_li_desc *li_desc,
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struct fc_fpin_stats *stats)
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{
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stats->li += be32_to_cpu(li_desc->event_count);
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switch (be16_to_cpu(li_desc->event_type)) {
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case FPIN_LI_UNKNOWN:
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stats->li_failure_unknown +=
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be32_to_cpu(li_desc->event_count);
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break;
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case FPIN_LI_LINK_FAILURE:
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stats->li_link_failure_count +=
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be32_to_cpu(li_desc->event_count);
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break;
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case FPIN_LI_LOSS_OF_SYNC:
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stats->li_loss_of_sync_count +=
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be32_to_cpu(li_desc->event_count);
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break;
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case FPIN_LI_LOSS_OF_SIG:
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stats->li_loss_of_signals_count +=
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be32_to_cpu(li_desc->event_count);
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break;
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case FPIN_LI_PRIM_SEQ_ERR:
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stats->li_prim_seq_err_count +=
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be32_to_cpu(li_desc->event_count);
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break;
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case FPIN_LI_INVALID_TX_WD:
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stats->li_invalid_tx_word_count +=
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be32_to_cpu(li_desc->event_count);
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break;
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case FPIN_LI_INVALID_CRC:
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stats->li_invalid_crc_count +=
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be32_to_cpu(li_desc->event_count);
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break;
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case FPIN_LI_DEVICE_SPEC:
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stats->li_device_specific +=
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be32_to_cpu(li_desc->event_count);
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break;
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}
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}
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static void
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fc_delivery_stats_update(u32 reason_code, struct fc_fpin_stats *stats)
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{
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stats->dn++;
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switch (reason_code) {
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case FPIN_DELI_UNKNOWN:
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stats->dn_unknown++;
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break;
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case FPIN_DELI_TIMEOUT:
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stats->dn_timeout++;
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break;
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case FPIN_DELI_UNABLE_TO_ROUTE:
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stats->dn_unable_to_route++;
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break;
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case FPIN_DELI_DEVICE_SPEC:
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stats->dn_device_specific++;
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break;
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}
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}
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static void
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fc_cn_stats_update(u16 event_type, struct fc_fpin_stats *stats)
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{
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stats->cn++;
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switch (event_type) {
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case FPIN_CONGN_CLEAR:
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stats->cn_clear++;
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break;
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case FPIN_CONGN_LOST_CREDIT:
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stats->cn_lost_credit++;
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break;
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case FPIN_CONGN_CREDIT_STALL:
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stats->cn_credit_stall++;
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break;
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case FPIN_CONGN_OVERSUBSCRIPTION:
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stats->cn_oversubscription++;
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break;
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case FPIN_CONGN_DEVICE_SPEC:
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stats->cn_device_specific++;
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}
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}
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/*
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* fc_fpin_li_stats_update - routine to update Link Integrity
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* event statistics.
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* @shost: host the FPIN was received on
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* @tlv: pointer to link integrity descriptor
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*
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*/
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static void
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fc_fpin_li_stats_update(struct Scsi_Host *shost, struct fc_tlv_desc *tlv)
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{
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u8 i;
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struct fc_rport *rport = NULL;
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struct fc_rport *attach_rport = NULL;
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struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
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struct fc_fn_li_desc *li_desc = (struct fc_fn_li_desc *)tlv;
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u64 wwpn;
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rport = fc_find_rport_by_wwpn(shost,
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be64_to_cpu(li_desc->attached_wwpn));
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if (rport &&
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(rport->roles & FC_PORT_ROLE_FCP_TARGET ||
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rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
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attach_rport = rport;
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fc_li_stats_update(li_desc, &attach_rport->fpin_stats);
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}
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if (be32_to_cpu(li_desc->pname_count) > 0) {
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for (i = 0;
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i < be32_to_cpu(li_desc->pname_count);
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i++) {
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wwpn = be64_to_cpu(li_desc->pname_list[i]);
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rport = fc_find_rport_by_wwpn(shost, wwpn);
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if (rport &&
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(rport->roles & FC_PORT_ROLE_FCP_TARGET ||
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rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
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if (rport == attach_rport)
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continue;
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fc_li_stats_update(li_desc,
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&rport->fpin_stats);
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}
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}
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}
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if (fc_host->port_name == be64_to_cpu(li_desc->attached_wwpn))
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fc_li_stats_update(li_desc, &fc_host->fpin_stats);
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}
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/*
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* fc_fpin_delivery_stats_update - routine to update Delivery Notification
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* event statistics.
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* @shost: host the FPIN was received on
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* @tlv: pointer to delivery descriptor
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*
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*/
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static void
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fc_fpin_delivery_stats_update(struct Scsi_Host *shost,
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struct fc_tlv_desc *tlv)
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{
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struct fc_rport *rport = NULL;
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struct fc_rport *attach_rport = NULL;
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struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
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struct fc_fn_deli_desc *dn_desc = (struct fc_fn_deli_desc *)tlv;
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u32 reason_code = be32_to_cpu(dn_desc->deli_reason_code);
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rport = fc_find_rport_by_wwpn(shost,
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be64_to_cpu(dn_desc->attached_wwpn));
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if (rport &&
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(rport->roles & FC_PORT_ROLE_FCP_TARGET ||
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rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
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attach_rport = rport;
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fc_delivery_stats_update(reason_code,
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&attach_rport->fpin_stats);
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}
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if (fc_host->port_name == be64_to_cpu(dn_desc->attached_wwpn))
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fc_delivery_stats_update(reason_code, &fc_host->fpin_stats);
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}
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/*
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* fc_fpin_peer_congn_stats_update - routine to update Peer Congestion
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* event statistics.
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* @shost: host the FPIN was received on
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* @tlv: pointer to peer congestion descriptor
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*
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*/
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static void
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fc_fpin_peer_congn_stats_update(struct Scsi_Host *shost,
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struct fc_tlv_desc *tlv)
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{
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u8 i;
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struct fc_rport *rport = NULL;
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struct fc_rport *attach_rport = NULL;
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struct fc_fn_peer_congn_desc *pc_desc =
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(struct fc_fn_peer_congn_desc *)tlv;
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u16 event_type = be16_to_cpu(pc_desc->event_type);
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u64 wwpn;
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rport = fc_find_rport_by_wwpn(shost,
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be64_to_cpu(pc_desc->attached_wwpn));
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if (rport &&
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(rport->roles & FC_PORT_ROLE_FCP_TARGET ||
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rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
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attach_rport = rport;
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fc_cn_stats_update(event_type, &attach_rport->fpin_stats);
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}
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if (be32_to_cpu(pc_desc->pname_count) > 0) {
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for (i = 0;
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i < be32_to_cpu(pc_desc->pname_count);
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i++) {
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wwpn = be64_to_cpu(pc_desc->pname_list[i]);
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rport = fc_find_rport_by_wwpn(shost, wwpn);
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if (rport &&
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(rport->roles & FC_PORT_ROLE_FCP_TARGET ||
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rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
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if (rport == attach_rport)
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continue;
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fc_cn_stats_update(event_type,
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&rport->fpin_stats);
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}
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}
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}
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}
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/*
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* fc_fpin_congn_stats_update - routine to update Congestion
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* event statistics.
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* @shost: host the FPIN was received on
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* @tlv: pointer to congestion descriptor
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*
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*/
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static void
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fc_fpin_congn_stats_update(struct Scsi_Host *shost,
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struct fc_tlv_desc *tlv)
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{
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struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
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struct fc_fn_congn_desc *congn = (struct fc_fn_congn_desc *)tlv;
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fc_cn_stats_update(be16_to_cpu(congn->event_type),
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&fc_host->fpin_stats);
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}
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/**
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* fc_host_rcv_fpin - routine to process a received FPIN.
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* @shost: host the FPIN was received on
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@ -642,6 +903,38 @@ EXPORT_SYMBOL(fc_host_post_vendor_event);
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void
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fc_host_fpin_rcv(struct Scsi_Host *shost, u32 fpin_len, char *fpin_buf)
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{
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struct fc_els_fpin *fpin = (struct fc_els_fpin *)fpin_buf;
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struct fc_tlv_desc *tlv;
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u32 desc_cnt = 0, bytes_remain;
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u32 dtag;
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/* Update Statistics */
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tlv = (struct fc_tlv_desc *)&fpin->fpin_desc[0];
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bytes_remain = fpin_len - offsetof(struct fc_els_fpin, fpin_desc);
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bytes_remain = min_t(u32, bytes_remain, be32_to_cpu(fpin->desc_len));
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while (bytes_remain >= FC_TLV_DESC_HDR_SZ &&
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bytes_remain >= FC_TLV_DESC_SZ_FROM_LENGTH(tlv)) {
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dtag = be32_to_cpu(tlv->desc_tag);
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switch (dtag) {
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case ELS_DTAG_LNK_INTEGRITY:
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fc_fpin_li_stats_update(shost, tlv);
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break;
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case ELS_DTAG_DELIVERY:
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fc_fpin_delivery_stats_update(shost, tlv);
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break;
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case ELS_DTAG_PEER_CONGEST:
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fc_fpin_peer_congn_stats_update(shost, tlv);
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break;
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case ELS_DTAG_CONGESTION:
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fc_fpin_congn_stats_update(shost, tlv);
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}
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desc_cnt++;
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bytes_remain -= FC_TLV_DESC_SZ_FROM_LENGTH(tlv);
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tlv = fc_tlv_next_desc(tlv);
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}
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fc_host_post_fc_event(shost, fc_get_event_number(),
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FCH_EVT_LINK_FPIN, fpin_len, fpin_buf, 0);
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}
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@ -819,6 +819,7 @@ void fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
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enum fc_host_event_code event_code, u32 event_data);
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void fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
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u32 data_len, char *data_buf, u64 vendor_id);
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struct fc_rport *fc_find_rport_by_wwpn(struct Scsi_Host *shost, u64 wwpn);
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void fc_host_post_fc_event(struct Scsi_Host *shost, u32 event_number,
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enum fc_host_event_code event_code,
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u32 data_len, char *data_buf, u64 vendor_id);
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