From: Shyam Sundar <ssundar@xxxxxxxxxxx>
Parse the incoming FPIN packets and update the host and rport FPIN
statistics based on the FPINs.
Signed-off-by: Shyam Sundar <ssundar@xxxxxxxxxxx>
Signed-off-by: Nilesh Javali <njavali@xxxxxxxxxxx>
---
drivers/scsi/scsi_transport_fc.c | 293 +++++++++++++++++++++++++++++++
include/scsi/scsi_transport_fc.h | 1 +
2 files changed, 294 insertions(+)
diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index 501e165ae6f1..4dfa0e40d8e5 100644
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -34,6 +34,11 @@ static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
static void fc_bsg_remove(struct request_queue *);
static void fc_bsg_goose_queue(struct fc_rport *);
+static void fc_li_stats_update(struct fc_fn_li_desc *li_desc,
+ struct fc_fpin_stats *stats);
+static void fc_delivery_stats_update(u32 reason_code,
+ struct fc_fpin_stats *stats);
+static void fc_cn_stats_update(u16 event_type, struct fc_fpin_stats *stats);
/*
* Module Parameters
@@ -630,6 +635,262 @@ fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
}
EXPORT_SYMBOL(fc_host_post_vendor_event);
+/**
+ * fc_find_rport_by_wwpn - find the fc_rport pointer for a given wwpn
+ * @shost: host the fc_rport is associated with
+ * @wwpn: wwpn of the fc_rport device
+ *
+ * Notes:
+ * This routine assumes no locks are held on entry.
+ */
+struct fc_rport *
+fc_find_rport_by_wwpn(struct Scsi_Host *shost, u64 wwpn)
+{
+ struct fc_rport *rport;
+ unsigned long flags;
+
+ spin_lock_irqsave(shost->host_lock, flags);
+
+ list_for_each_entry(rport, &fc_host_rports(shost), peers) {
+ if (rport->port_state != FC_PORTSTATE_ONLINE)
+ continue;
+
+ if (rport->port_name == wwpn) {
+ spin_unlock_irqrestore(shost->host_lock, flags);
+ return rport;
+ }
+ }
+
+ spin_unlock_irqrestore(shost->host_lock, flags);
+ return NULL;
+}
+EXPORT_SYMBOL(fc_find_rport_by_wwpn);
+
+static void
+fc_li_stats_update(struct fc_fn_li_desc *li_desc,
+ struct fc_fpin_stats *stats)
+{
+ stats->li += be32_to_cpu(li_desc->event_count);
+ switch (be16_to_cpu(li_desc->event_type)) {
+ case FPIN_LI_UNKNOWN:
+ stats->li_failure_unknown +=
+ be32_to_cpu(li_desc->event_count);
+ break;
+ case FPIN_LI_LINK_FAILURE:
+ stats->li_link_failure_count +=
+ be32_to_cpu(li_desc->event_count);
+ break;
+ case FPIN_LI_LOSS_OF_SYNC:
+ stats->li_loss_of_sync_count +=
+ be32_to_cpu(li_desc->event_count);
+ break;
+ case FPIN_LI_LOSS_OF_SIG:
+ stats->li_loss_of_signals_count +=
+ be32_to_cpu(li_desc->event_count);
+ break;
+ case FPIN_LI_PRIM_SEQ_ERR:
+ stats->li_prim_seq_err_count +=
+ be32_to_cpu(li_desc->event_count);
+ break;
+ case FPIN_LI_INVALID_TX_WD:
+ stats->li_invalid_tx_word_count +=
+ be32_to_cpu(li_desc->event_count);
+ break;
+ case FPIN_LI_INVALID_CRC:
+ stats->li_invalid_crc_count +=
+ be32_to_cpu(li_desc->event_count);
+ break;
+ case FPIN_LI_DEVICE_SPEC:
+ stats->li_device_specific +=
+ be32_to_cpu(li_desc->event_count);
+ break;
+ }
+}
+
+static void
+fc_delivery_stats_update(u32 reason_code, struct fc_fpin_stats *stats)
+{
+ stats->dn++;
+ switch (reason_code) {
+ case FPIN_DELI_UNKNOWN:
+ stats->dn_unknown++;
+ break;
+ case FPIN_DELI_TIMEOUT:
+ stats->dn_timeout++;
+ break;
+ case FPIN_DELI_UNABLE_TO_ROUTE:
+ stats->dn_unable_to_route++;
+ break;
+ case FPIN_DELI_DEVICE_SPEC:
+ stats->dn_device_specific++;
+ break;
+ }
+}
+
+static void
+fc_cn_stats_update(u16 event_type, struct fc_fpin_stats *stats)
+{
+ stats->cn++;
+ switch (event_type) {
+ case FPIN_CONGN_CLEAR:
+ stats->cn_clear++;
+ break;
+ case FPIN_CONGN_LOST_CREDIT:
+ stats->cn_lost_credit++;
+ break;
+ case FPIN_CONGN_CREDIT_STALL:
+ stats->cn_credit_stall++;
+ break;
+ case FPIN_CONGN_OVERSUBSCRIPTION:
+ stats->cn_oversubscription++;
+ break;
+ case FPIN_CONGN_DEVICE_SPEC:
+ stats->cn_device_specific++;
+ }
+}
+
+/*
+ * fc_fpin_li_stats_update - routine to update Link Integrity
+ * event statistics.
+ * @shost: host the FPIN was received on
+ * @tlv: pointer to link integrity descriptor
+ *
+ */
+static void
+fc_fpin_li_stats_update(struct Scsi_Host *shost, struct fc_tlv_desc *tlv)
+{
+ u8 i;
+ struct fc_rport *rport = NULL;
+ struct fc_rport *attach_rport = NULL;
+ struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
+ struct fc_fn_li_desc *li_desc = (struct fc_fn_li_desc *)tlv;
+ u64 wwpn;
+
+ rport = fc_find_rport_by_wwpn(shost,
+ be64_to_cpu(li_desc->attached_wwpn));
+ if (rport &&
+ (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
+ rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
+ attach_rport = rport;
+ fc_li_stats_update(li_desc, &attach_rport->fpin_stats);
+ }
+
+ 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]);
+ rport = fc_find_rport_by_wwpn(shost, wwpn);
+ if (rport &&
+ (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
+ rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
+ if (rport == attach_rport)
+ continue;
+ fc_li_stats_update(li_desc,
+ &rport->fpin_stats);
+ }
+ }
+ }
+
+ if (fc_host->port_name == be64_to_cpu(li_desc->attached_wwpn))
+ fc_li_stats_update(li_desc, &fc_host->fpin_stats);
+}
+
+/*
+ * fc_fpin_delivery_stats_update - routine to update Delivery Notification
+ * event statistics.
+ * @shost: host the FPIN was received on
+ * @tlv: pointer to delivery descriptor
+ *
+ */
+static void
+fc_fpin_delivery_stats_update(struct Scsi_Host *shost,
+ struct fc_tlv_desc *tlv)
+{
+ struct fc_rport *rport = NULL;
+ struct fc_rport *attach_rport = NULL;
+ struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
+ struct fc_fn_deli_desc *dn_desc = (struct fc_fn_deli_desc *)tlv;
+ u32 reason_code = be32_to_cpu(dn_desc->deli_reason_code);
+
+ rport = fc_find_rport_by_wwpn(shost,
+ be64_to_cpu(dn_desc->attached_wwpn));
+ if (rport &&
+ (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
+ rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
+ attach_rport = rport;
+ fc_delivery_stats_update(reason_code,
+ &attach_rport->fpin_stats);
+ }
+
+ if (fc_host->port_name == be64_to_cpu(dn_desc->attached_wwpn))
+ fc_delivery_stats_update(reason_code, &fc_host->fpin_stats);
+}
+
+/*
+ * fc_fpin_peer_congn_stats_update - routine to update Peer Congestion
+ * event statistics.
+ * @shost: host the FPIN was received on
+ * @tlv: pointer to peer congestion descriptor
+ *
+ */
+static void
+fc_fpin_peer_congn_stats_update(struct Scsi_Host *shost,
+ struct fc_tlv_desc *tlv)
+{
+ u8 i;
+ struct fc_rport *rport = NULL;
+ struct fc_rport *attach_rport = NULL;
+ struct fc_fn_peer_congn_desc *pc_desc =
+ (struct fc_fn_peer_congn_desc *)tlv;
+ u16 event_type = be16_to_cpu(pc_desc->event_type);
+ u64 wwpn;
+
+ rport = fc_find_rport_by_wwpn(shost,
+ be64_to_cpu(pc_desc->attached_wwpn));
+ if (rport &&
+ (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
+ rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
+ attach_rport = rport;
+ fc_cn_stats_update(event_type, &attach_rport->fpin_stats);
+ }
+
+ if (be32_to_cpu(pc_desc->pname_count) > 0) {
+ for (i = 0;
+ i < be32_to_cpu(pc_desc->pname_count);
+ i++) {
+ wwpn = be64_to_cpu(pc_desc->pname_list[i]);
+ rport = fc_find_rport_by_wwpn(shost, wwpn);
+ if (rport &&
+ (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
+ rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
+ if (rport == attach_rport)
+ continue;
+ fc_cn_stats_update(event_type,
+ &rport->fpin_stats);
+ }
+ }
+ }
+}
+
+/*
+ * fc_fpin_congn_stats_update - routine to update Congestion
+ * event statistics.
+ * @shost: host the FPIN was received on
+ * @tlv: pointer to congestion descriptor
+ *
+ */
+static void
+fc_fpin_congn_stats_update(struct Scsi_Host *shost,
+ struct fc_tlv_desc *tlv)
+{
+ struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
+ struct fc_fn_congn_desc *congn = (struct fc_fn_congn_desc *)tlv;
+
+ fc_cn_stats_update(be16_to_cpu(congn->event_type),
+ &fc_host->fpin_stats);
+}
+
/**
* fc_host_rcv_fpin - routine to process a received FPIN.
* @shost: host the FPIN was received on
@@ -642,6 +903,38 @@ EXPORT_SYMBOL(fc_host_post_vendor_event);
void
fc_host_fpin_rcv(struct Scsi_Host *shost, u32 fpin_len, char *fpin_buf)
{
+ struct fc_els_fpin *fpin = (struct fc_els_fpin *)fpin_buf;
+ struct fc_tlv_desc *tlv;
+ u32 desc_cnt = 0, bytes_remain;
+ u32 dtag;
+
+ /* Update Statistics */
+ tlv = (struct fc_tlv_desc *)&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->desc_tag);
+ switch (dtag) {
+ case ELS_DTAG_LNK_INTEGRITY:
+ fc_fpin_li_stats_update(shost, tlv);
+ break;
+ case ELS_DTAG_DELIVERY:
+ fc_fpin_delivery_stats_update(shost, tlv);
+ break;
+ case ELS_DTAG_PEER_CONGEST:
+ fc_fpin_peer_congn_stats_update(shost, tlv);
+ break;
+ case ELS_DTAG_CONGESTION:
+ fc_fpin_congn_stats_update(shost, tlv);
+ }
+
+ desc_cnt++;
+ bytes_remain -= FC_TLV_DESC_SZ_FROM_LENGTH(tlv);
+ tlv = fc_tlv_next_desc(tlv);
+ }
+
fc_host_post_fc_event(shost, fc_get_event_number(),
FCH_EVT_LINK_FPIN, fpin_len, fpin_buf, 0);
}
diff --git a/include/scsi/scsi_transport_fc.h b/include/scsi/scsi_transport_fc.h
index 487a403ee51e..a636c1986e22 100644
--- a/include/scsi/scsi_transport_fc.h
+++ b/include/scsi/scsi_transport_fc.h
@@ -819,6 +819,7 @@ void fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
enum fc_host_event_code event_code, u32 event_data);
void fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
u32 data_len, char *data_buf, u64 vendor_id);
+struct fc_rport *fc_find_rport_by_wwpn(struct Scsi_Host *shost, u64 wwpn);
void fc_host_post_fc_event(struct Scsi_Host *shost, u32 event_number,
enum fc_host_event_code event_code,
u32 data_len, char *data_buf, u64 vendor_id);
--
2.19.0.rc0
