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--- soc:2009:asdlkf:journal:week7 [2009/07/07 17:30]
asdlkf created
+++ soc:2009:asdlkf:journal:week7 [2009/07/12 11:21] (current)
asdlkf
@@ Line 1: / Line 1: @@
 July 4: Meeting with Marty: There are obviously some shortcommings in my driver design; As my driver progress has been good up to this point, I'm going to take a step back for a while and do some personal education on other drivers and driver structure;
@@ Line 9: / Line 10: @@
 July 7: I'm currently working on the SKGE driver outline, in the same format as r8169 and 3c90x. -> see notes.
+July 8: Worked on a new outline for skge, worked on a new version of probe. Power failure. Nothing to show for it :(
+July 9-10: Missing my pills; with out them I can't stay awake at a keyboard.
+July 11: Meeting with mentors. Informed that I need to make some "major progress" by monday, or be failed.
+Re-wrote probe section of skge.outline
+Moved the software reset section of skge_initialize into a new function and called it in probe instead. (skge_hardware_reset)
+Moved chip identification section of skge_initialize into a new function and called int in probe instead. (skge_load_chip_identifiers)
+in skge_initialize:
+ - moved hardware reset and chip identification code out of this function
+ - moved clock code into new function: (skge_stop_and_configure_clocks)
+ - moved non-genesis specific information into new function: (generic init)
+outline now looks like this:
+<code>
+skge_probe
+	alloc_etherdev
+	netdev_init
+	pci_set_drvdata
+	adjust_pci_device
+	skge_get_register_address
+	skge_hardware_reset
+	skge_load_chip_identifiers
+	skge_initialize
+		skge_genesis_init
+		skge_generic_init
+		skge_stop_and_configure_clocks
+	skge_devinit
+		skge_supported_modes
+		netdev_link_down
+	netdev_link_up
+skge_open
+	 Setup RX Resources
+	       skge_ring_alloc
+	       skge_rx_fill
+	             populate_rx_descriptor
+	 Setup TX Resources
+	       skge_ring_alloc
+	       skge_tx_fill
+	 skge_start_clocks
+ 	       software_reset_device
+skge_irq
+	netdev_priv
+skge_transmit
+	skge_avail
+	skge_write8
+skge_poll
+	skge_extirq
+	skge_process_tx
+		skge_tx_done
+	skge_process_rx
+		skge_rx_desc
+		skge_rx_get
+		netdev_rx
+		skge_refill_rx_ring
+			populate_rx_descriptor
+skge_close
+	skge_hardware_reset
+		skge_configure_irq
+	skge_free_tx_resources
+	skge_free_rx_resources
+skge_remove
+	pci_get_Drvdata
+	unregister_netdev
+	netdev_nullify
+	netdev_put
+</code>
+-- removed every line not directly used by probe:
+ - Commented out all operations in all root (core 7) functions except probe. Recompiled and commented out any "declaired but unused" functions until compiled cleanly.
+<code>
+cp skge.c skge.c.2
+cat skge.c.2 | grep -v \n// > skge.c
+</code>
+ - recompiled to check everything's running.
+-- Resorted all functions in skge.c based on call order.
+-- Changed how netdev_priv() is being used. It was previously being used to store information about the skge_port structure. It is holding the skge_private structure which was previously the skge_adapter structure.
+<code>
+struct skge_private {
+        unsigned long     regs;         //hardware register base
+        uint8_t           *hw_addr;     //
+        unsigned long     io_base;      // physical chip base add
+        struct net_device *netdev;   	// net device instance
+        struct skge_port  *port;	// port specific private variables
+        struct pci_device *pdev;        // physical device instance
+        u32               intr_mask;
+        uint32_t          ioaddr;       // io address
+        uint32_t          irqno;        // irq number of device
+        uint32_t          tx_ring_size; //
+        uint32_t          rx_ring_size; //
+        u16               phy_addr;     // physical device addres
+        u8                chip_id;      // chip id of device
+        u8                chip_rev;     // chip revision
+        u8                copper;       // medium
+        u8                port_count;   // number of ports
+        u8                phy_type;     // ???
+        u32               ram_size;     // ram size
+        u32               ram_offset;   // ram offset
+};
+struct skge_port {
+        struct skge_private  *adapter; // Link to parent adapter
+        struct net_device    *netdev;  // Link to sibling net_device
+        int                  port_number;
+        u32                  msg_enable;
+        struct skge_ring     tx_ring;
+        struct skge_ring     rx_ring;
+        unsigned int         rx_buf_size;
+        enum pause_control   flow_control;
+        enum pause_status    flow_status;
+        u8                   rx_csum;
+        u8                   blink_on;
+        u8                   wol;
+        u8                   autoneg;   /* AUTONEG_ENABLE, AUTONE
+        u8                   duplex;    /* DUPLEX_HALF, DUPLEX_FU
+        u16                  speed;     /* SPEED_1000, SPEED_100,
+        u32                  advertising;
+        void                 *mem;      /* PCI memory for rings *
+        u32                  dma;
+        unsigned long        mem_size;
+        int                  use_xm_link_timer;
+};
+struct net_device {
+        struct refcnt refcnt;
+        struct list_head list;
+        struct list_head open_list;
+        char name[8];
+        struct device *dev;
+        struct net_device_operations *op;
+        struct ll_protocol *ll_protocol;
+        uint8_t ll_addr[MAX_LL_ADDR_LEN];
+        unsigned int state;
+        size_t max_pkt_len;
+        struct list_head tx_queue;
+        struct list_head rx_queue;
+        struct net_device_stats tx_stats;
+        struct net_device_stats rx_stats;
+        struct generic_settings settings;
+        void *priv;
+};
+</code>
+As an example of how data will be passed around:
+<code>
+netdev
+|->name
+|->dev
+|->op
+|->ll_adr[]
+|->priv
+   |->regs
+   |->netdev
+   |  <link to parent>
+   |->port_count
+   |->port
+   |  |->port_number
+   |  |->tx_ring
+   |  |  |->*to_use -> skge_element
+   |  |  |->*to_clean -> skge_element
+   |  |  |->*start -> skge_element
+   |  |->rx_ring
+   |  |  |->*to_use -> skge_element
+   |  |  |->*to_clean -> skge_element
+   |  |  |->*start -> skge_element
+   |  |->rx_buf_size
+   |  |->autoneg
+   |  |->duplex
+   |  |->speed
+   |  |->advertising
+   |  |->dma
+   |  |->mem_size
+   |  |->use_xm_link_timer
+   |->pdev
+   |->tx_ring_size
+   |->rx_ring_size
+   |->phy_addr
+   |->phy_type
+   |->chip_id
+   |->chip_rev
+   |->copper
+   |->ram_size
+   |->ram_offset
+</code>
+I took another look at open, and I'm not happy with the structure as it was;
+It's again been redefined to this (but it's very likely to change by tomorrow).
+<code>
+skge_open
+	setup_rx_resources
+		skge_ring_alloc
+			refill_rx_ring
+			populate_rx_descriptor
+	setup_tx_resources
+		skge_ring_alloc
+	start_clocks
+		software_reset_device
+</code>
+Plan for tomorrow:
+<code>
+/Re-outline existing skge_open in much more detail
+|Compare above outline with the intended structure for skge_open
+|Separate tx and rx memory sections; perform two malloc_dma's instead of one;
+\Each tx and rx section of open should be completely separate
+Re-write skge_open (and all it's child functions)in it's new form and outline
+Specificly:
+ - Change all instances of netdev_priv (as now netdev_priv is an instance of skge_private, not skge_port)
+ - Enumerate all access to the tx and rx rings and make sure they are using separated access methods.
+</code>
 -- Chris

Trace: • week9 • week7

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