[S2IO]: Support for add/delete/store/restore ethernet addresses

- Support to add/delete/store/restore 64 and 128 Ethernet addresses for Xframe I and Xframe II respectively.

Signed-off-by: Sreenivasa Honnur <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/s2io-regs.h

···
 	u64 rmac_cfg_key;
 #define RMAC_CFG_KEY(val)               vBIT(val,0,16)
 
-#define MAX_MAC_ADDRESSES           16
-#define MAX_MC_ADDRESSES            32	/* Multicast addresses */
-#define MAC_MAC_ADDR_START_OFFSET   0
-#define MAC_MC_ADDR_START_OFFSET    16
-#define MAC_MC_ALL_MC_ADDR_OFFSET   63	/* enables all multicast pkts */
+#define S2IO_MAC_ADDR_START_OFFSET	0
+
+#define S2IO_XENA_MAX_MC_ADDRESSES	64	/* multicast addresses */
+#define S2IO_HERC_MAX_MC_ADDRESSES	256
+
+#define S2IO_XENA_MAX_MAC_ADDRESSES	16
+#define S2IO_HERC_MAX_MAC_ADDRESSES	64
+
+#define S2IO_XENA_MC_ADDR_START_OFFSET	16
+#define S2IO_HERC_MC_ADDR_START_OFFSET	64
+
 	u64 rmac_addr_cmd_mem;
 #define RMAC_ADDR_CMD_MEM_WE                    s2BIT(7)
 #define RMAC_ADDR_CMD_MEM_RD                    0

drivers/net/s2io.c

···
 	/* Set swapper to enable I/O register access */
 	s2io_set_swapper(sp);
 
+	/* restore mac_addr entries */
+	do_s2io_restore_unicast_mc(sp);
+
 	/* Restore the MSIX table entries from local variables */
 	restore_xmsi_data(sp);
 
···
 		val64 = readq(&bar0->pcc_err_reg);
 		writeq(val64, &bar0->pcc_err_reg);
 	}
-
-	/* restore the previously assigned mac address */
-	do_s2io_prog_unicast(sp->dev, (u8 *)&sp->def_mac_addr[0].mac_addr);
 
 	sp->device_enabled_once = FALSE;
 }
···
 static int s2io_close(struct net_device *dev)
 {
 	struct s2io_nic *sp = dev->priv;
+	struct config_param *config = &sp->config;
+	u64 tmp64;
+	int offset;
 
 	/* Return if the device is already closed               *
 	*  Can happen when s2io_card_up failed in change_mtu    *
···
 		return 0;
 
 	netif_stop_queue(dev);
+
+	/* delete all populated mac entries */
+	for (offset = 1; offset < config->max_mc_addr; offset++) {
+		tmp64 = do_s2io_read_unicast_mc(sp, offset);
+		if (tmp64 != S2IO_DISABLE_MAC_ENTRY)
+			do_s2io_delete_unicast_mc(sp, tmp64);
+	}
+
 	/* Reset card, kill tasklet and free Tx and Rx buffers. */
 	s2io_card_down(sp);
 
···
 	struct XENA_dev_config __iomem *bar0 = sp->bar0;
 	u64 val64 = 0, multi_mac = 0x010203040506ULL, mask =
 	    0xfeffffffffffULL;
-	u64 dis_addr = 0xffffffffffffULL, mac_addr = 0;
+	u64 dis_addr = S2IO_DISABLE_MAC_ENTRY, mac_addr = 0;
 	void __iomem *add;
+	struct config_param *config = &sp->config;
 
 	if ((dev->flags & IFF_ALLMULTI) && (!sp->m_cast_flg)) {
 		/*  Enable all Multicast addresses */
···
 		       &bar0->rmac_addr_data1_mem);
 		val64 = RMAC_ADDR_CMD_MEM_WE |
 		    RMAC_ADDR_CMD_MEM_STROBE_NEW_CMD |
-		    RMAC_ADDR_CMD_MEM_OFFSET(MAC_MC_ALL_MC_ADDR_OFFSET);
+		    RMAC_ADDR_CMD_MEM_OFFSET(config->max_mc_addr - 1);
 		writeq(val64, &bar0->rmac_addr_cmd_mem);
 		/* Wait till command completes */
 		wait_for_cmd_complete(&bar0->rmac_addr_cmd_mem,
···
 					S2IO_BIT_RESET);
 
 		sp->m_cast_flg = 1;
-		sp->all_multi_pos = MAC_MC_ALL_MC_ADDR_OFFSET;
+		sp->all_multi_pos = config->max_mc_addr - 1;
 	} else if ((dev->flags & IFF_ALLMULTI) && (sp->m_cast_flg)) {
 		/*  Disable all Multicast addresses */
 		writeq(RMAC_ADDR_DATA0_MEM_ADDR(dis_addr),
···
 	/*  Update individual M_CAST address list */
 	if ((!sp->m_cast_flg) && dev->mc_count) {
 		if (dev->mc_count >
-		    (MAX_ADDRS_SUPPORTED - MAC_MC_ADDR_START_OFFSET - 1)) {
+		    (config->max_mc_addr - config->max_mac_addr)) {
 			DBG_PRINT(ERR_DBG, "%s: No more Rx filters ",
 				  dev->name);
 			DBG_PRINT(ERR_DBG, "can be added, please enable ");
···
 			val64 = RMAC_ADDR_CMD_MEM_WE |
 			    RMAC_ADDR_CMD_MEM_STROBE_NEW_CMD |
 			    RMAC_ADDR_CMD_MEM_OFFSET
-			    (MAC_MC_ADDR_START_OFFSET + i);
+			    (config->mc_start_offset + i);
 			writeq(val64, &bar0->rmac_addr_cmd_mem);
 
 			/* Wait for command completes */
···
 			val64 = RMAC_ADDR_CMD_MEM_WE |
 			    RMAC_ADDR_CMD_MEM_STROBE_NEW_CMD |
 			    RMAC_ADDR_CMD_MEM_OFFSET
-			    (i + MAC_MC_ADDR_START_OFFSET);
+			    (i + config->mc_start_offset);
 			writeq(val64, &bar0->rmac_addr_cmd_mem);
 
 			/* Wait for command completes */
···
 	}
 }
 
-/* add unicast MAC address to CAM */
-static int do_s2io_add_unicast(struct s2io_nic *sp, u64 addr, int off)
+/* read from CAM unicast & multicast addresses and store it in
+ * def_mac_addr structure
+ */
+void do_s2io_store_unicast_mc(struct s2io_nic *sp)
+{
+	int offset;
+	u64 mac_addr = 0x0;
+	struct config_param *config = &sp->config;
+
+	/* store unicast & multicast mac addresses */
+	for (offset = 0; offset < config->max_mc_addr; offset++) {
+		mac_addr = do_s2io_read_unicast_mc(sp, offset);
+		/* if read fails disable the entry */
+		if (mac_addr == FAILURE)
+			mac_addr = S2IO_DISABLE_MAC_ENTRY;
+		do_s2io_copy_mac_addr(sp, offset, mac_addr);
+	}
+}
+
+/* restore unicast & multicast MAC to CAM from def_mac_addr structure */
+static void do_s2io_restore_unicast_mc(struct s2io_nic *sp)
+{
+	int offset;
+	struct config_param *config = &sp->config;
+	/* restore unicast mac address */
+	for (offset = 0; offset < config->max_mac_addr; offset++)
+		do_s2io_prog_unicast(sp->dev,
+			sp->def_mac_addr[offset].mac_addr);
+
+	/* restore multicast mac address */
+	for (offset = config->mc_start_offset;
+		offset < config->max_mc_addr; offset++)
+		do_s2io_add_mc(sp, sp->def_mac_addr[offset].mac_addr);
+}
+
+/* add a multicast MAC address to CAM */
+static int do_s2io_add_mc(struct s2io_nic *sp, u8 *addr)
+{
+	int i;
+	u64 mac_addr = 0;
+	struct config_param *config = &sp->config;
+
+	for (i = 0; i < ETH_ALEN; i++) {
+		mac_addr <<= 8;
+		mac_addr |= addr[i];
+	}
+	if ((0ULL == mac_addr) || (mac_addr == S2IO_DISABLE_MAC_ENTRY))
+		return SUCCESS;
+
+	/* check if the multicast mac already preset in CAM */
+	for (i = config->mc_start_offset; i < config->max_mc_addr; i++) {
+		u64 tmp64;
+		tmp64 = do_s2io_read_unicast_mc(sp, i);
+		if (tmp64 == S2IO_DISABLE_MAC_ENTRY) /* CAM entry is empty */
+			break;
+
+		if (tmp64 == mac_addr)
+			return SUCCESS;
+	}
+	if (i == config->max_mc_addr) {
+		DBG_PRINT(ERR_DBG,
+			"CAM full no space left for multicast MAC\n");
+		return FAILURE;
+	}
+	/* Update the internal structure with this new mac address */
+	do_s2io_copy_mac_addr(sp, i, mac_addr);
+
+	return (do_s2io_add_mac(sp, mac_addr, i));
+}
+
+/* add MAC address to CAM */
+static int do_s2io_add_mac(struct s2io_nic *sp, u64 addr, int off)
 {
 	u64 val64;
 	struct XENA_dev_config __iomem *bar0 = sp->bar0;
···
 	if (wait_for_cmd_complete(&bar0->rmac_addr_cmd_mem,
 		RMAC_ADDR_CMD_MEM_STROBE_CMD_EXECUTING,
 		S2IO_BIT_RESET)) {
-		DBG_PRINT(INFO_DBG, "add_mac_addr failed\n");
+		DBG_PRINT(INFO_DBG, "do_s2io_add_mac failed\n");
 		return FAILURE;
 	}
 	return SUCCESS;
+}
+/* deletes a specified unicast/multicast mac entry from CAM */
+static int do_s2io_delete_unicast_mc(struct s2io_nic *sp, u64 addr)
+{
+	int offset;
+	u64 dis_addr = S2IO_DISABLE_MAC_ENTRY, tmp64;
+	struct config_param *config = &sp->config;
+
+	for (offset = 1;
+		offset < config->max_mc_addr; offset++) {
+		tmp64 = do_s2io_read_unicast_mc(sp, offset);
+		if (tmp64 == addr) {
+			/* disable the entry by writing  0xffffffffffffULL */
+			if (do_s2io_add_mac(sp, dis_addr, offset) ==  FAILURE)
+				return FAILURE;
+			/* store the new mac list from CAM */
+			do_s2io_store_unicast_mc(sp);
+			return SUCCESS;
+		}
+	}
+	DBG_PRINT(ERR_DBG, "MAC address 0x%llx not found in CAM\n",
+			(unsigned long long)addr);
+	return FAILURE;
+}
+
+/* read mac entries from CAM */
+static u64 do_s2io_read_unicast_mc(struct s2io_nic *sp, int offset)
+{
+	u64 tmp64 = 0xffffffffffff0000ULL, val64;
+	struct XENA_dev_config __iomem *bar0 = sp->bar0;
+
+	/* read mac addr */
+	val64 =
+		RMAC_ADDR_CMD_MEM_RD | RMAC_ADDR_CMD_MEM_STROBE_NEW_CMD |
+		RMAC_ADDR_CMD_MEM_OFFSET(offset);
+	writeq(val64, &bar0->rmac_addr_cmd_mem);
+
+	/* Wait till command completes */
+	if (wait_for_cmd_complete(&bar0->rmac_addr_cmd_mem,
+		RMAC_ADDR_CMD_MEM_STROBE_CMD_EXECUTING,
+		S2IO_BIT_RESET)) {
+		DBG_PRINT(INFO_DBG, "do_s2io_read_unicast_mc failed\n");
+		return FAILURE;
+	}
+	tmp64 = readq(&bar0->rmac_addr_data0_mem);
+	return (tmp64 >> 16);
 }
 
 /**
  * s2io_set_mac_addr driver entry point
  */
+
 static int s2io_set_mac_addr(struct net_device *dev, void *p)
 {
 	struct sockaddr *addr = p;
···
 	/* store the MAC address in CAM */
 	return (do_s2io_prog_unicast(dev, dev->dev_addr));
 }
-
 /**
  *  do_s2io_prog_unicast - Programs the Xframe mac address
  *  @dev : pointer to the device structure.
···
  *  Return value: SUCCESS on success and an appropriate (-)ve integer
  *  as defined in errno.h file on failure.
  */
+
 static int do_s2io_prog_unicast(struct net_device *dev, u8 *addr)
 {
 	struct s2io_nic *sp = dev->priv;
 	register u64 mac_addr = 0, perm_addr = 0;
 	int i;
+	u64 tmp64;
+	struct config_param *config = &sp->config;
 
 	/*
 	* Set the new MAC address as the new unicast filter and reflect this
···
 	if (mac_addr == perm_addr)
 		return SUCCESS;
 
+	/* check if the mac already preset in CAM */
+	for (i = 1; i < config->max_mac_addr; i++) {
+		tmp64 = do_s2io_read_unicast_mc(sp, i);
+		if (tmp64 == S2IO_DISABLE_MAC_ENTRY) /* CAM entry is empty */
+			break;
+
+		if (tmp64 == mac_addr) {
+			DBG_PRINT(INFO_DBG,
+			"MAC addr:0x%llx already present in CAM\n",
+			(unsigned long long)mac_addr);
+			return SUCCESS;
+		}
+	}
+	if (i == config->max_mac_addr) {
+		DBG_PRINT(ERR_DBG, "CAM full no space left for Unicast MAC\n");
+		return FAILURE;
+	}
 	/* Update the internal structure with this new mac address */
-	do_s2io_copy_mac_addr(sp, 0, mac_addr);
-	return (do_s2io_add_unicast(sp, mac_addr, 0));
+	do_s2io_copy_mac_addr(sp, i, mac_addr);
+	return (do_s2io_add_mac(sp, mac_addr, i));
 }
 
 /**
···
 	 */
 	bar0 = sp->bar0;
 	val64 = RMAC_ADDR_CMD_MEM_RD | RMAC_ADDR_CMD_MEM_STROBE_NEW_CMD |
-	    RMAC_ADDR_CMD_MEM_OFFSET(0 + MAC_MAC_ADDR_START_OFFSET);
+	    RMAC_ADDR_CMD_MEM_OFFSET(0 + S2IO_MAC_ADDR_START_OFFSET);
 	writeq(val64, &bar0->rmac_addr_cmd_mem);
 	wait_for_cmd_complete(&bar0->rmac_addr_cmd_mem,
 		      RMAC_ADDR_CMD_MEM_STROBE_CMD_EXECUTING, S2IO_BIT_RESET);
···
 	dev->addr_len = ETH_ALEN;
 	memcpy(dev->dev_addr, sp->def_mac_addr, ETH_ALEN);
 	memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
+
+	/* initialize number of multicast & unicast MAC entries variables */
+	if (sp->device_type == XFRAME_I_DEVICE) {
+		config->max_mc_addr = S2IO_XENA_MAX_MC_ADDRESSES;
+		config->max_mac_addr = S2IO_XENA_MAX_MAC_ADDRESSES;
+		config->mc_start_offset = S2IO_XENA_MC_ADDR_START_OFFSET;
+	} else if (sp->device_type == XFRAME_II_DEVICE) {
+		config->max_mc_addr = S2IO_HERC_MAX_MC_ADDRESSES;
+		config->max_mac_addr = S2IO_HERC_MAX_MAC_ADDRESSES;
+		config->mc_start_offset = S2IO_HERC_MC_ADDR_START_OFFSET;
+	}
+
+	/* store mac addresses from CAM to s2io_nic structure */
+	do_s2io_store_unicast_mc(sp);
 
 	 /* Store the values of the MSIX table in the s2io_nic structure */
 	store_xmsi_data(sp);

drivers/net/s2io.h

···
 #define SUCCESS 0
 #define FAILURE -1
 #define S2IO_MINUS_ONE 0xFFFFFFFFFFFFFFFFULL
+#define S2IO_DISABLE_MAC_ENTRY 0xFFFFFFFFFFFFULL
 #define S2IO_MAX_PCI_CONFIG_SPACE_REINIT 100
 #define S2IO_BIT_RESET 1
 #define S2IO_BIT_SET 2
···
 #define MAX_MTU_JUMBO               (MAX_PYLD_JUMBO+18)
 #define MAX_MTU_JUMBO_VLAN          (MAX_PYLD_JUMBO+22)
 	u16 bus_speed;
+	int max_mc_addr;	/* xena=64 herc=256 */
+	int max_mac_addr;	/* xena=16 herc=64 */
+	int mc_start_offset;	/* xena=16 herc=64 */
 };
 
 /* Structure representing MAC Addrs */
···
 #define MAX_MAC_SUPPORTED   16
 #define MAX_SUPPORTED_MULTICASTS MAX_MAC_SUPPORTED
 
-	struct mac_addr def_mac_addr[MAX_MAC_SUPPORTED];
+	struct mac_addr def_mac_addr[256];
 
 	struct net_device_stats stats;
 	int high_dma_flag;
···
 #define MAX_ADDRS_SUPPORTED 64
 	u16 usr_addr_count;
 	u16 mc_addr_count;
-	struct usr_addr usr_addrs[MAX_ADDRS_SUPPORTED];
+	struct usr_addr usr_addrs[256];
 
 	u16 m_cast_flg;
 	u16 all_multi_pos;
···
 static void s2io_rem_isr(struct s2io_nic * sp);
 
 static void restore_xmsi_data(struct s2io_nic *nic);
+static void do_s2io_store_unicast_mc(struct s2io_nic *sp);
+static void do_s2io_restore_unicast_mc(struct s2io_nic *sp);
+static u64 do_s2io_read_unicast_mc(struct s2io_nic *sp, int offset);
+static int do_s2io_add_mc(struct s2io_nic *sp, u8 *addr);
+static int do_s2io_add_mac(struct s2io_nic *sp, u64 addr, int offset);
+static int do_s2io_delete_unicast_mc(struct s2io_nic *sp, u64 addr);
 
 static int
 s2io_club_tcp_session(u8 *buffer, u8 **tcp, u32 *tcp_len, struct lro **lro,