Add the capability to read the complete contents of the NVRAM via sysctl

dev.bce.<unit>.nvram_dump
Add the capability to write the complete contents of the NVRAM via sysctl
	dev.bce.<unit>.nvram_write
These are only available if the kernel option BCE_DEBUG is enabled.
The nvram_write sysctl also requires the kernel option
BCE_NVRAM_WRITE_SUPPORT to be enabled.  These are to be used at your
own caution.  Since the MAC addresses are stored in the NVRAM, if you
dump one NIC and restore it on another NIC the destination NIC's
MAC addresses will not be preserved.  A tool can be made using these
sysctl's to manage the on-chip firmware.

Reviewed by:	davidch, yongari

sys/conf/options

@@ -696,6 +696,7 @@ ED_SIC			opt_ed.h
 
 # bce driver
 BCE_DEBUG		opt_bce.h
+BCE_NVRAM_WRITE_SUPPORT	opt_bce.h
 
 SOCKBUF_DEBUG		opt_global.h
 

sys/dev/bce/if_bce.c

@@ -343,6 +343,12 @@ static int  bce_miibus_read_reg		(device_t, int, int);
 static int  bce_miibus_write_reg	(device_t, int, int, int);
 static void bce_miibus_statchg		(device_t);
 
+#ifdef BCE_DEBUG
+static int sysctl_nvram_dump(SYSCTL_HANDLER_ARGS);
+#ifdef BCE_NVRAM_WRITE_SUPPORT
+static int sysctl_nvram_write(SYSCTL_HANDLER_ARGS);
+#endif
+#endif
 
 /****************************************************************************/
 /* BCE NVRAM Access Routines                                                */
@@ -8342,6 +8348,57 @@ bce_sysctl_phy_read(SYSCTL_HANDLER_ARGS)
 }
 
 
+static int
+sysctl_nvram_dump(SYSCTL_HANDLER_ARGS)
+{
+	struct bce_softc *sc = (struct bce_softc *)arg1;
+	int error, i;
+
+	if (sc->nvram_buf == NULL) {
+		sc->nvram_buf = malloc(sc->bce_flash_size,
+				       M_TEMP, M_ZERO | M_WAITOK);
+	}
+	if (sc->nvram_buf == NULL) {
+		return(ENOMEM);
+	}
+	if (req->oldlen == sc->bce_flash_size) {
+		for (i = 0; i < sc->bce_flash_size; i++) {
+			bce_nvram_read(sc, i, &sc->nvram_buf[i], 1);
+		}
+	}
+
+	error = SYSCTL_OUT(req, sc->nvram_buf, sc->bce_flash_size);
+
+	return error;
+}
+
+#ifdef BCE_NVRAM_WRITE_SUPPORT
+static int
+sysctl_nvram_write(SYSCTL_HANDLER_ARGS)
+{
+	struct bce_softc *sc = (struct bce_softc *)arg1;
+	int error;
+
+	if (sc->nvram_buf == NULL) {
+		sc->nvram_buf = malloc(sc->bce_flash_size,
+				       M_TEMP, M_ZERO | M_WAITOK);
+	}
+	if (sc->nvram_buf == NULL) {
+		return(ENOMEM);
+	}
+	bzero(sc->nvram_buf, sc->bce_flash_size);
+	error = SYSCTL_IN(req, sc->nvram_buf, sc->bce_flash_size);
+
+	if (req->newlen == sc->bce_flash_size) {
+		bce_nvram_write(sc, 0, sc->nvram_buf , sc->bce_flash_size);
+	}
+
+
+	return error;
+}
+#endif
+
+
 /****************************************************************************/
 /* Provides a sysctl interface to allow reading a CID.                      */
 /*                                                                          */
@@ -8566,6 +8623,16 @@ bce_add_sysctls(struct bce_softc *sc)
 	    "interrupts_tx",
 	    CTLFLAG_RD, &sc->interrupts_tx,
 	    0, "Number of TX interrupts");
+	SYSCTL_ADD_PROC(ctx, children, OID_AUTO,
+	    "nvram_dump", CTLTYPE_OPAQUE | CTLFLAG_RD,
+	    (void *)sc, 0,
+	    sysctl_nvram_dump, "S", "");
+#ifdef BCE_NVRAM_WRITE_SUPPORT
+	SYSCTL_ADD_PROC(ctx, children, OID_AUTO,
+	    "nvram_write", CTLTYPE_OPAQUE | CTLFLAG_WR,
+	    (void *)sc, 0,
+	    sysctl_nvram_write, "S", "");
+#endif
 #endif
 
 	SYSCTL_ADD_ULONG(ctx, children, OID_AUTO,

sys/dev/bce/if_bcereg.h

@@ -6790,6 +6790,7 @@ struct bce_softc
 	/* Number of VLAN tagged frames stripped. */
 	u32			vlan_tagged_frames_stripped;
 #endif
+	uint8_t *nvram_buf;
 };
 
 #endif /* __BCEREG_H_DEFINED */