scsi: fc: add FPIN ELS definition

T11 has introduced a new Fabric Notifications mechanism whereby the fabric
can notify a port of events occurring in the fabric.  The notifications are
given by the FPIN ELS.

Add the FPIN ELS definitions to the kernel.

Signed-off-by: James Smart <jsmart2021@gmail.com>
Reviewed-by: Ewan D. Milne <emilne@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/include/uapi/scsi/fc/fc_els.h b/include/uapi/scsi/fc/fc_els.h
index b7e0a5e..a81c535 100644 (file)
--- a/include/uapi/scsi/fc/fc_els.h
+++ b/include/uapi/scsi/fc/fc_els.h
@@ -52,6 +52,7 @@ enum fc_els_cmd {
        ELS_RRQ =       0x12,   /* reinstate recovery qualifier */
        ELS_REC =       0x13,   /* read exchange concise */
        ELS_SRR =       0x14,   /* sequence retransmission request */
+       ELS_FPIN =      0x16,   /* Fabric Performance Impact Notification */
        ELS_PRLI =      0x20,   /* process login */
        ELS_PRLO =      0x21,   /* process logout */
        ELS_SCN =       0x22,   /* state change notification */
@@ -119,6 +120,7 @@ enum fc_els_cmd {
        [ELS_RRQ] =     "RRQ",                  \
        [ELS_REC] =     "REC",                  \
        [ELS_SRR] =     "SRR",                  \
+       [ELS_FPIN] =    "FPIN",                 \
        [ELS_PRLI] =    "PRLI",                 \
        [ELS_PRLO] =    "PRLO",                 \
        [ELS_SCN] =     "SCN",                  \
@@ -829,4 +831,35 @@ enum fc_els_clid_ic {
        ELS_CLID_IC_LIP =       8,      /* receiving LIP */
 };
 
+
+/*
+ * Fabric Notification Descriptor Tag values
+ */
+enum fc_fn_dtag {
+       ELS_FN_DTAG_LNK_INTEGRITY =     0x00020001,     /* Link Integrity */
+       ELS_FN_DTAG_PEER_CONGEST =      0x00020003,     /* Peer Congestion */
+       ELS_FN_DTAG_CONGESTION =        0x00020004,     /* Congestion */
+};
+
+/*
+ * Fabric Notification Descriptor
+ */
+struct fc_fn_desc {
+       __be32          fn_desc_tag;    /* Notification Descriptor Tag */
+       __be32          fn_desc_value_len; /* Length of Descriptor Value field
+                                           * (in bytes)
+                                           */
+       __u8            fn_desc_value[0];  /* Descriptor Value */
+};
+
+/*
+ * ELS_FPIN - Fabric Performance Impact Notification
+ */
+struct fc_els_fpin {
+       __u8            fpin_cmd;       /* command (0x16) */
+       __u8            fpin_zero[3];   /* specified as zero - part of cmd */
+       __be32          fpin_desc_cnt;  /* count of descriptors */
+       struct fc_fn_desc       fpin_desc[0];   /* Descriptor list */
+};
+
 #endif /* _FC_ELS_H_ */