dlg@ikkaku ~$ kstat myx*:::                                
myx0:0:myx-fw-specs:0
   0: 4d 41 43 3d 30 30 3a 36 30 3a 64 64 3a 34 34 3a |MAC=00:60:dd:44:|
  16: 35 63 3a 33 32 00 53 4e 3d 34 35 38 32 30 39 00 |5c:32_SN=458209_|
  32: 50 57 52 3d 31 30 30 00 50 43 3d 31 30 47 2d 50 |PWR=100_PC=10G-P|
  48: 43 49 45 32 2d 38 42 32 2d 32 53 00 50 4e 3d 30 |CIE2-8B2-2S_PN=0|
  64: 39 2d 30 34 32 34 34 00 4d 45 4d 4d 41 50 3d 2d |9-04244_MEMMAP=-|
  80: 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 00 |---------------_|
  96: 50 53 45 52 44 45 53 3d 30 00 54 41 47 3d 7a 65 |PSERDES=0_TAG=ze|
 112: 5f 74 6f 6f 6c 73 2d 31 5f 34 5f 35 33 61 00 00 |_tools-1_4_53a__|
 128: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |~~~~~~~~~~~~~~~~|
 144: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |~~~~~~~~~~~~~~~~|
 160: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |~~~~~~~~~~~~~~~~|
 176: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |~~~~~~~~~~~~~~~~|
 192: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |~~~~~~~~~~~~~~~~|
 208: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |~~~~~~~~~~~~~~~~|
 224: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |~~~~~~~~~~~~~~~~|
 240: ff ff ff ff ff ff ff ff ff ff ff ff ff ff 00 00 |~~~~~~~~~~~~~~__|
myx0:0:myx-stats:0
     pause drops: 0 packets
  ucast filtered: 0 packets
       bad crc32: 0 packets
         bad phy: 0 packets
  mcast filtered: 152 packets
         tx done: 474 packets
     rx discards: 0 packets
       rx errors: 0 packets
    rx undersize: 0 packets
     rx oversize: 0 packets
  small discards: 0 packets
  large discards: 0 packets
  rdma tags free: 15
myx0:0:rxq:0
         packets: 545 packets
           bytes: 115531 bytes
          qdrops: 0 packets
          errors: 0 packets
            qlen: 0 packets
myx0:0:txq:0
         packets: 474 packets
           bytes: 124027 bytes
          qdrops: 0 packets
          errors: 0 packets
            qlen: 0 packets
         maxqlen: 1023 packets
         oactive: false
myx1:0:myx-fw-specs:0
   0: 4d 41 43 3d 30 30 3a 36 30 3a 64 64 3a 34 34 3a |MAC=00:60:dd:44:|
  16: 35 63 3a 33 33 00 53 4e 3d 34 35 38 32 30 39 00 |5c:33_SN=458209_|
  32: 50 57 52 3d 31 30 30 00 50 43 3d 31 30 47 2d 50 |PWR=100_PC=10G-P|
  48: 43 49 45 32 2d 38 42 32 2d 32 53 00 50 4e 3d 30 |CIE2-8B2-2S_PN=0|
  64: 39 2d 30 34 32 34 34 00 4d 45 4d 4d 41 50 3d 2d |9-04244_MEMMAP=-|
  80: 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 00 |---------------_|
  96: 50 53 45 52 44 45 53 3d 30 00 54 41 47 3d 7a 65 |PSERDES=0_TAG=ze|
 112: 5f 74 6f 6f 6c 73 2d 31 5f 34 5f 35 33 61 00 00 |_tools-1_4_53a__|
 128: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |~~~~~~~~~~~~~~~~|
 144: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |~~~~~~~~~~~~~~~~|
 160: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |~~~~~~~~~~~~~~~~|
 176: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |~~~~~~~~~~~~~~~~|
 192: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |~~~~~~~~~~~~~~~~|
 208: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |~~~~~~~~~~~~~~~~|
 224: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |~~~~~~~~~~~~~~~~|
 240: ff ff ff ff ff ff ff ff ff ff ff ff ff ff 00 00 |~~~~~~~~~~~~~~__|
myx1:0:myx-stats:0
     pause drops: 0 packets
  ucast filtered: 0 packets
       bad crc32: 0 packets
         bad phy: 0 packets
  mcast filtered: 84 packets
         tx done: 130 packets
     rx discards: 0 packets
       rx errors: 0 packets
    rx undersize: 0 packets
     rx oversize: 0 packets
  small discards: 0 packets
  large discards: 0 packets
  rdma tags free: 15
myx1:0:rxq:0
         packets: 201 packets
           bytes: 29537 bytes
          qdrops: 0 packets
          errors: 0 packets
            qlen: 0 packets
myx1:0:txq:0
         packets: 130 packets
           bytes: 76277 bytes
          qdrops: 0 packets
          errors: 0 packets
            qlen: 0 packets
         maxqlen: 1023 packets
         oactive: false

Index: if_myx.c
===================================================================
RCS file: /cvs/src/sys/dev/pci/if_myx.c,v
retrieving revision 1.115
diff -u -p -r1.115 if_myx.c
--- if_myx.c	8 Feb 2021 08:18:45 -0000	1.115
+++ if_myx.c	17 Jan 2022 05:06:15 -0000
@@ -162,10 +162,14 @@ struct myx_softc {
 
 	struct rwlock		 sc_sff_lock;
 
+	uint8_t			 sc_fw_specs[MYX_STRING_SPECS_SIZE];
+	uint32_t		 sc_fw_specs_len;
+
 #if NKSTAT > 0
 	struct mutex		 sc_kstat_mtx;
 	struct timeout		 sc_kstat_tmo;
 	struct kstat		*sc_kstat;
+	struct kstat		*sc_kstat_fw_specs;
 #endif
 };
 
@@ -376,8 +380,8 @@ myx_query(struct myx_softc *sc, char *pa
 {
 	struct myx_gen_hdr hdr;
 	u_int32_t	offset;
-	u_int8_t	strings[MYX_STRING_SPECS_SIZE];
 	u_int		i, len, maxlen;
+	uint8_t		*strings = sc->sc_fw_specs;
 
 	myx_read(sc, MYX_HEADER_POS, &offset, sizeof(offset));
 	offset = betoh32(offset);
@@ -388,9 +392,11 @@ myx_query(struct myx_softc *sc, char *pa
 
 	myx_read(sc, offset, &hdr, sizeof(hdr));
 	offset = betoh32(hdr.fw_specs);
-	len = min(betoh32(hdr.fw_specs_len), sizeof(strings));
+	len = min(betoh32(hdr.fw_specs_len), sizeof(sc->sc_fw_specs));
 
-	bus_space_read_region_1(sc->sc_memt, sc->sc_memh, offset, strings, len);
+	bus_space_read_region_1(sc->sc_memt, sc->sc_memh, offset,
+	    sc->sc_fw_specs, len);
+	sc->sc_fw_specs_len = len;
 
 	for (i = 0; i < len; i++) {
 		maxlen = len - i;
@@ -2236,6 +2242,12 @@ myx_kstat_stop(struct myx_softc *sc)
 	mtx_leave(&sc->sc_kstat_mtx);
 }
 
+static int
+myx_kstat_read_nop(struct kstat *ks)
+{
+	return (0);
+}
+
 void
 myx_kstat_attach(struct myx_softc *sc)
 {
@@ -2272,6 +2284,19 @@ myx_kstat_attach(struct myx_softc *sc)
 
 	ks->ks_softc = sc;
 	sc->sc_kstat = ks;
+	kstat_install(ks);
+
+	ks = kstat_create(DEVNAME(sc), 0, "myx-fw-specs", 0, KSTAT_T_RAW, 0);
+	if (ks == NULL)
+		return;
+
+	ks->ks_data = sc->sc_fw_specs;
+	ks->ks_datalen = sc->sc_fw_specs_len;
+	getnanouptime(&ks->ks_updated);
+	ks->ks_read = myx_kstat_read_nop;
+
+	ks->ks_softc = ks;
+	sc->sc_kstat_fw_specs = ks;
 	kstat_install(ks);
 }
 #endif /* NKSTAT > 0 */