2009-08-17 Till Straumann <strauman@slac.stanford.edu>

* network/tsec.c, network/if_tsec_pub.h:
	Fixed bugs in multicast support; added reference-count
	for hash-table entries which allows for the implementation
	of a 'deletion' routine.
	NOTE: mcast support largely untested.

c/src/lib/libbsp/powerpc/mvme3100/ChangeLog

@@ -1,3 +1,11 @@
+2009-08-17	Till Straumann <strauman@slac.stanford.edu>
+
+	* network/tsec.c, network/if_tsec_pub.h:
+	Fixed bugs in multicast support; added reference-count
+	for hash-table entries which allows for the implementation
+	of a 'deletion' routine.
+	NOTE: mcast support largely untested.
+
 2009-06-05	Till Straumann <strauman@slac.stanford.edu>
 
 	* irq/irq_init.c: silenced compiler warning.

c/src/lib/libbsp/powerpc/mvme3100/network/if_tsec_pub.h

@@ -182,35 +182,51 @@ BSP_tsec_init_hw(struct tsec_private *mp, int promisc, unsigned char *enaddr);
  * Clear multicast hash filter. No multicast frames are accepted
  * after executing this routine (unless the hardware was initialized
  * in 'promiscuous' mode).
+ *
+ * Reset reference count for all hash-table entries
+ * to zero (see BSP_tsec_mcast_filter_accept_del()).
  */
 void
 BSP_tsec_mcast_filter_clear(struct tsec_private *mp);
 
 /*
  * Program multicast filter to accept all multicast frames.
+ *
+ * Increment reference count for all hash-table entries
+ * by one (see BSP_tsec_mcast_filter_accept_del()).
  */
 void
 BSP_tsec_mcast_filter_accept_all(struct tsec_private *mp);
 
 /*
- * Add a MAC address to the multicast filter.
+ * Add a MAC address to the multicast filter and increment
+ * the reference count for the matching hash-table entry
+ * (see BSP_tsec_mcast_filter_accept_del()).
+ * 
  * Existing entries are not changed but note that
  * the filter is imperfect, i.e., multiple MAC addresses
  * may alias to a single filter entry. Hence software
  * filtering must still be performed.
  *
- * NOTE: Deletion of an address is not possible. This is
- *       usually accomplished by a higher-level driver
- *       maintaining a list/database of multicast addresses
- *       and going through a sequence:
- *
- *         BSP_tsec_mcast_filter_clear()
- *         forall mcast addresses do
- *            BSP_tsec_mcast_filter_accept_add()
  */
 void
 BSP_tsec_mcast_filter_accept_add(struct tsec_private *mp, unsigned char *enaddr);
 
+/*
+ * Remove a MAC address from the (imperfec) multicast
+ * filter.
+ * Note that the driver maintains an internal reference
+ * counter for each multicast hash. The hash-table
+ * entry is only cleared when the reference count
+ * reaches zero ('del' has been called the same
+ * amount of times as 'add' for an address (or
+ * any alias) that matches a given table entry.
+ * BSP_tsec_mcast_filter_clear() resets all reference
+ * counters to zero.
+ */
+void
+BSP_tsec_mcast_filter_accept_del(struct tsec_private *mp, unsigned char *enaddr);
+
 /*
  * Dump statistics to FILE 'f'. If NULL, stdout is used.
  */

c/src/lib/libbsp/powerpc/mvme3100/network/tsec.c

@@ -640,6 +640,8 @@ static inline void bd_wrbuf(TSEC_BD *bd, uint32_t addr)
 
 /* Driver 'private' data */
 
+#define NUM_MC_HASHES		256
+
 struct tsec_private {
 	FEC_Enet_Base	base;            /* Controller base address                  */
 	FEC_Enet_Base	phy_base;        /* Phy base address (not necessarily identical
@@ -684,6 +686,7 @@ struct tsec_private {
 		unsigned	odrops;
 		unsigned	repack;
 	}               stats;
+	uint16_t		mc_refcnt[NUM_MC_HASHES];
 };
 
 #define NEXT_TXI(mp, i)	(((i)+1) < (mp)->tx_ring_size ? (i)+1 : 0 )
@@ -1402,9 +1405,10 @@ rtems_interrupt_level l;
 }
 
 static uint8_t
-hash_accept(struct tsec_private *mp, uint32_t tble, const uint8_t *enaddr)
+hash_prog(struct tsec_private *mp, uint32_t tble, const uint8_t *enaddr, int accept)
 {
-uint8_t s;
+uint8_t  s;
+uint32_t reg, bit;
 
 	s = ether_crc32_le(enaddr, ETHER_ADDR_LEN);
 
@@ -1413,7 +1417,16 @@ uint8_t s;
     s = ((s&0x33) << 2) | ((s&0xcc) >> 2);
     s = ((s&0x55) << 1) | ((s&0xaa) >> 1);
 
-	fec_wr( mp->base, tble + (s >> (5-2)), (1 << (31 - (s & 31))) );
+	reg = tble + ((s >> (5-2)) & ~3);
+	bit = 1 << (31 - (s & 31));
+
+	if ( accept ) {
+		if ( 0 == mp->mc_refcnt[s]++ )
+			fec_set( mp->base, reg, bit );
+	} else {
+		if ( mp->mc_refcnt[s] > 0 && 0 == --mp->mc_refcnt[s] )
+			fec_clr( mp->base, reg, bit );
+	}
 }
 
 void
@@ -1423,6 +1436,8 @@ int i;
 	for ( i=0; i<8*4; i+=4 ) {
 		fec_wr( mp->base, TSEC_GADDR0 + i, 0 );
 	}
+	for ( i=0; i<NUM_MC_HASHES; i++ )
+		mp->mc_refcnt[i] = 0;
 }
 
 void
@@ -1432,10 +1447,12 @@ int i;
 	for ( i=0; i<8*4; i+=4 ) {
 		fec_wr( mp->base, TSEC_GADDR0 + i, 0xffffffff );
 	}
+	for ( i=0; i<NUM_MC_HASHES; i++ )
+		mp->mc_refcnt[i]++;
 }
 
-void
+static void
-BSP_tsec_mcast_filter_accept_add(struct tsec_private *mp, uint8_t *enaddr)
+mcast_filter_prog(struct tsec_private *mp, uint8_t *enaddr, int accept)
 {
 static const uint8_t bcst={0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
 	if ( ! (enaddr[0] & 0x01) ) {
@@ -1446,7 +1463,19 @@ static const uint8_t bcst={0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
 		/* broadcast; ignore */
 		return;
 	}
-	hash_accept(mp, TSEC_GADDR0, enaddr);
+	hash_prog(mp, TSEC_GADDR0, enaddr, accept);
+}
+
+void
+BSP_tsec_mcast_filter_accept_add(struct tsec_private *mp, uint8_t *enaddr)
+{
+	mcast_filter_prog(mp, enaddr, 1 /* accept */);
+}
+
+void
+BSP_tsec_mcast_filter_accept_del(struct tsec_private *mp, uint8_t *enaddr)
+{
+	mcast_filter_prog(mp, enaddr, 0 /* delete */);
 }
 
 void