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authorMuneendra <muneendra.kumar@broadcom.com>2023-02-09 06:43:26 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2023-02-22 02:03:29 +0300
commit64fd2ba977b1b6b073bcf4c71906f820bc531421 (patch)
tree138bdec8127be17b25451819f6a7c94c12e0607a /drivers/scsi
parent3fe97ff3d94934649abb0652028dd7296170c8d0 (diff)
downloadlinux-64fd2ba977b1b6b073bcf4c71906f820bc531421.tar.xz
scsi: scsi_transport_fc: Add an additional flag to fc_host_fpin_rcv()
The LLDD and the stack currently process FPINs received from the fabric, but the stack is not aware of any action taken by the driver to alleviate congestion. The current interface between the driver and the SCSI stack is limited to passing the notification mainly for statistics and heuristics. The reaction to an FPIN could be handled either by the driver or by the stack (marginal path and failover). Amend the interface to indicate if action on an FPIN has already been reacted to by the LLDDs or not. Add an additional flag to fc_host_fpin_rcv() to indicate if the FPIN has been acknowledged/reacted to by the driver. Also added a new event code FCH_EVT_LINK_FPIN_ACK to notify to the user that the event has been acknowledged/reacted by the LLDD driver Link: https://lore.kernel.org/r/20230209034326.882514-1-muneendra.kumar@broadcom.com Co-developed-by: Anil Gurumurthy <agurumurthy@marvell.com> Signed-off-by: Anil Gurumurthy <agurumurthy@marvell.com> Co-developed-by: Nilesh Javali <njavali@marvell.com> Signed-off-by: Nilesh Javali <njavali@marvell.com> Signed-off-by: Muneendra <muneendra.kumar@broadcom.com> Reviewed-by: James Smart <jsmart2021@gmail.com> Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com> Reviewed-by: Ewan D. Milne <emilne@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/lpfc/lpfc_els.c2
-rw-r--r--drivers/scsi/qla2xxx/qla_isr.c2
-rw-r--r--drivers/scsi/scsi_transport_fc.c10
3 files changed, 9 insertions, 5 deletions
diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
index 569639dc8b2c..aee5d0d1187d 100644
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -10287,7 +10287,7 @@ lpfc_els_rcv_fpin(struct lpfc_vport *vport, void *p, u32 fpin_length)
/* Send every descriptor individually to the upper layer */
if (deliver)
fc_host_fpin_rcv(lpfc_shost_from_vport(vport),
- fpin_length, (char *)fpin);
+ fpin_length, (char *)fpin, 0);
desc_cnt++;
}
}
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index 46e8b38603f0..030625ebb4e6 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -45,7 +45,7 @@ qla27xx_process_purex_fpin(struct scsi_qla_host *vha, struct purex_item *item)
ql_dump_buffer(ql_dbg_init + ql_dbg_verbose, vha, 0x508f,
pkt, pkt_size);
- fc_host_fpin_rcv(vha->host, pkt_size, (char *)pkt);
+ fc_host_fpin_rcv(vha->host, pkt_size, (char *)pkt, 0);
}
const char *const port_state_str[] = {
diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index 0965f8a7134f..f12e9467ebb4 100644
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -137,6 +137,7 @@ static const struct {
{ FCH_EVT_PORT_FABRIC, "port_fabric" },
{ FCH_EVT_LINK_UNKNOWN, "link_unknown" },
{ FCH_EVT_LINK_FPIN, "link_FPIN" },
+ { FCH_EVT_LINK_FPIN_ACK, "link_FPIN_ACK" },
{ FCH_EVT_VENDOR_UNIQUE, "vendor_unique" },
};
fc_enum_name_search(host_event_code, fc_host_event_code,
@@ -894,17 +895,20 @@ fc_fpin_congn_stats_update(struct Scsi_Host *shost,
* @shost: host the FPIN was received on
* @fpin_len: length of FPIN payload, in bytes
* @fpin_buf: pointer to FPIN payload
- *
+ * @event_acknowledge: 1, if LLDD handles this event.
* Notes:
* This routine assumes no locks are held on entry.
*/
void
-fc_host_fpin_rcv(struct Scsi_Host *shost, u32 fpin_len, char *fpin_buf)
+fc_host_fpin_rcv(struct Scsi_Host *shost, u32 fpin_len, char *fpin_buf,
+ u8 event_acknowledge)
{
struct fc_els_fpin *fpin = (struct fc_els_fpin *)fpin_buf;
struct fc_tlv_desc *tlv;
u32 desc_cnt = 0, bytes_remain;
u32 dtag;
+ enum fc_host_event_code event_code =
+ event_acknowledge ? FCH_EVT_LINK_FPIN_ACK : FCH_EVT_LINK_FPIN;
/* Update Statistics */
tlv = (struct fc_tlv_desc *)&fpin->fpin_desc[0];
@@ -934,7 +938,7 @@ fc_host_fpin_rcv(struct Scsi_Host *shost, u32 fpin_len, char *fpin_buf)
}
fc_host_post_fc_event(shost, fc_get_event_number(),
- FCH_EVT_LINK_FPIN, fpin_len, fpin_buf, 0);
+ event_code, fpin_len, fpin_buf, 0);
}
EXPORT_SYMBOL(fc_host_fpin_rcv);