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Date:	Wed, 31 Jan 2007 22:54:35 +0530
From:	Amit Kale <amitkale@...xen.com>
To:	Jeff Garzik <jeff@...zik.org>,
	Francois Romieu <romieu@...zoreil.com>
Cc:	netdev@...r.kernel.org, brazilnut@...ibm.com,
	netxenproj@...syssoft.com, rob@...xen.com, sanjeev@...xen.com,
	wendyx@...ibm.com
Subject: Re: [PATCH 1/2] NetXen: Added ethtool support for user level tools

Ueimor, Jeff,

Thanks for reviewing. We are integrating these into our code and will send an 
update tomorrow.

-Amit


On Wednesday 31 January 2007 15:46, Jeff Garzik wrote:
> Amit S. Kale wrote:
> > Added ethtool support for user level firmware management utilities.
> >
> > Signed-off-by: Amit S. Kale <amitkale@...xen.com>
>
> You will need to resend against netdev#upstream, which now contains Al
> Viro's netxen annotations.
>
> Please add sparse checking (read Documentation/sparse.txt) to your build
> process, after updating for Al Viro's changes.
>
> > ---
> >
> >  netxen_nic.h         |   16 ++-
> >  netxen_nic_ethtool.c |   87 +++++++++++++---
> >  netxen_nic_init.c    |  268
> > ++++++++++++++++++++++++++++++++++++++++++++++++++- 3 files changed, 351
> > insertions(+), 20 deletions(-)
> >
> > diff --git a/drivers/net/netxen/netxen_nic.h
> > b/drivers/net/netxen/netxen_nic.h index 59324b1..f188b59 100644
> > --- a/drivers/net/netxen/netxen_nic.h
> > +++ b/drivers/net/netxen/netxen_nic.h
> > @@ -63,12 +63,16 @@ #include <asm/pgtable.h>
> >
> >  #include "netxen_nic_hw.h"
> >
> > -#define NETXEN_NIC_BUILD_NO     "2"
> > +#define NETXEN_NIC_BUILD_NO     "3"
>
> As mentioned previously, this constant should be removed
>
> >  #define _NETXEN_NIC_LINUX_MAJOR 3
> >  #define _NETXEN_NIC_LINUX_MINOR 3
> >  #define _NETXEN_NIC_LINUX_SUBVERSION 3
> >  #define NETXEN_NIC_LINUX_VERSIONID  "3.3.3" "-" NETXEN_NIC_BUILD_NO
> >
> > +#define NUM_FLASH_SECTORS (64)
> > +#define FLASH_SECTOR_SIZE (64*1024)
> > +#define FLASH_TOTAL_SIZE  (NUM_FLASH_SECTORS*FLASH_SECTOR_SIZE)
> > +
> >  #define RCV_DESC_RINGSIZE	\
> >  	(sizeof(struct rcv_desc) * adapter->max_rx_desc_count)
> >  #define STATUS_DESC_RINGSIZE	\
> > @@ -85,6 +89,7 @@ #define NETXEN_NETDEV_STATUS		0x1
> >  #define NETXEN_RCV_PRODUCER_OFFSET	0
> >  #define NETXEN_RCV_PEG_DB_ID		2
> >  #define NETXEN_HOST_DUMMY_DMA_SIZE 1024
> > +#define FLASH_SUCCESS 0
> >
> >  #define ADDR_IN_WINDOW1(off)	\
> >  	((off > NETXEN_CRB_PCIX_HOST2) && (off < NETXEN_CRB_MAX)) ? 1 : 0
> > @@ -1034,6 +1039,15 @@ void netxen_phantom_init(struct netxen_a
> >  void netxen_load_firmware(struct netxen_adapter *adapter);
> >  int netxen_pinit_from_rom(struct netxen_adapter *adapter, int verbose);
> >  int netxen_rom_fast_read(struct netxen_adapter *adapter, int addr, int
> > *valp); +int netxen_rom_fast_read_words(struct netxen_adapter *adapter,
> > int addr, +				u8 *bytes, size_t size);
> > +int netxen_rom_fast_write_words(struct netxen_adapter *adapter, int
> > addr, +				u8 *bytes, size_t size);
> > +int netxen_flash_unlock(struct netxen_adapter *adapter);
> > +int netxen_backup_crbinit(struct netxen_adapter *adapter);
> > +int netxen_flash_erase_secondary(struct netxen_adapter *adapter);
> > +int netxen_flash_erase_primary(struct netxen_adapter *adapter);
> > +
> >  int netxen_rom_fast_write(struct netxen_adapter *adapter, int addr, int
> > data); int netxen_rom_se(struct netxen_adapter *adapter, int addr);
> >  int netxen_do_rom_se(struct netxen_adapter *adapter, int addr);
> > diff --git a/drivers/net/netxen/netxen_nic_ethtool.c
> > b/drivers/net/netxen/netxen_nic_ethtool.c index 3404461..49b3b4c 100644
> > --- a/drivers/net/netxen/netxen_nic_ethtool.c
> > +++ b/drivers/net/netxen/netxen_nic_ethtool.c
> > @@ -32,6 +32,7 @@
> >   */
> >
> >  #include <linux/types.h>
> > +#include <linux/delay.h>
> >  #include <asm/uaccess.h>
> >  #include <linux/pci.h>
> >  #include <asm/io.h>
> > @@ -94,17 +95,7 @@ #define NETXEN_MAX_EEPROM_LEN   1024
> >
> >  static int netxen_nic_get_eeprom_len(struct net_device *dev)
> >  {
> > -	struct netxen_port *port = netdev_priv(dev);
> > -	struct netxen_adapter *adapter = port->adapter;
> > -	int n;
> > -
> > -	if ((netxen_rom_fast_read(adapter, 0, &n) == 0)
> > -	    && (n & NETXEN_ROM_ROUNDUP)) {
> > -		n &= ~NETXEN_ROM_ROUNDUP;
> > -		if (n < NETXEN_MAX_EEPROM_LEN)
> > -			return n;
> > -	}
> > -	return 0;
> > +	return FLASH_TOTAL_SIZE;
> >  }
> >
> >  static void
> > @@ -445,13 +436,78 @@ netxen_nic_get_eeprom(struct net_device
> >  		return -EINVAL;
> >
> >  	eeprom->magic = (port->pdev)->vendor | ((port->pdev)->device << 16);
> > -	for (offset = 0; offset < eeprom->len; offset++)
> > -		if (netxen_rom_fast_read
> > -		    (adapter, (8 * offset) + 8, (int *)eeprom->data) == -1)
> > -			return -EIO;
> > +	offset = eeprom->offset;
> > +
> > +	if (netxen_rom_fast_read_words
> > +		(adapter, offset, bytes, eeprom->len) == -1){
> > +		return -EIO;
> > +	}
>
> two non-standard style elements:
>
> 1) function arguments should follow the function on the same line.  wrap
> the line at the first argument that crosses the 72-column barrier
>
> 2) do not use braces '{' '}' to enclose a single C statement
>
> >  	return 0;
> >  }
> >
> > +static int
> > +netxen_nic_set_eeprom(struct net_device *dev, struct ethtool_eeprom
> > *eeprom, +			u8 * bytes)
> > +{
> > +	struct netxen_port *port = netdev_priv(dev);
> > +	struct netxen_adapter *adapter = port->adapter;
> > +	int offset = eeprom->offset;
> > +	static int first_write = 1;
> > +	int ret;
> > +	static int ready_to_flash = 0;
> > +
> > +	if(first_write == 1){
> > +		netxen_flash_unlock(adapter);
> > +		printk("%s: flash unlocked. \n", netxen_nic_driver_name);
> > +		if ((ret = netxen_flash_erase_secondary(adapter))
> > +			!= FLASH_SUCCESS) {
>
> do not combine a test and a C statement into the same line
>
> > +			printk("%s: Flash erase failed.\n",
> > +				netxen_nic_driver_name);
> > +			return(ret);
>
> 1) return is not a function.  do not enclose its arguments in parens.
>
> 2) is it ok to return without re-locking flash?
>
> > +		}
> > +		printk("%s: secondary flash erased successfully.\n",
> > +			netxen_nic_driver_name);
>
> Do not add printk() calls without a KERN_xxx message prefix.
>
> Moreover, you should probably be using dev_{err,info,...} instead of
> printk()
>
> > +		first_write = 0;
> > +		return 0;
>
> ditto (re-locking flash)
>
> > +	}
> > +
> > +	if(offset == BOOTLD_START){
>
> add spaces following "if", this is not Java ;-)
>
> > +		if ((ret = netxen_flash_erase_primary(adapter))
> > +			!= FLASH_SUCCESS) {
> > +			printk("%s: Flash erase failed.\n",
> > +				netxen_nic_driver_name);
> > +			return ret;
>
> ditto (re-locking flash)
>
> > +		}
> > +		if((ret = netxen_rom_se(adapter, USER_START)) != FLASH_SUCCESS)
> > +			return ret;
> > +		if((ret = netxen_rom_se(adapter, FIXED_START)) != FLASH_SUCCESS)
> > +			return ret;
>
> 1) more statement + tests that should be split into two lines apiece
>
> 2) re-locking flash?
>
> > +		printk("%s: primary flash erased successfully\n",
> > +			netxen_nic_driver_name);
> > +		udelay (500);
> > +
> > +		if((ret = netxen_backup_crbinit(adapter)) != FLASH_SUCCESS){
> > +			printk("%s: CRBinit backup failed.\n",
> > +				netxen_nic_driver_name);
> > +			return ret;
> > +		}
> > +		printk("%s: CRBinit backup done.\n", netxen_nic_driver_name);
> > +		ready_to_flash = 1;
> > +		udelay (500);
> > +	}
> > +
> > +	if(!ready_to_flash){
> > +		printk("%s: Invalid write sequence, returning...\n",
> > +			netxen_nic_driver_name);
> > +		return -EINVAL;
>
> more naked printk's
>
> > +
> > +	udelay (500);
> > +
> > +	return netxen_rom_fast_write_words(adapter, offset, bytes,
> > eeprom->len); +}
> > +
> >  static void
> >  netxen_nic_get_ringparam(struct net_device *dev, struct
> > ethtool_ringparam *ring) {
> > @@ -721,6 +777,7 @@ struct ethtool_ops netxen_nic_ethtool_op
> >  	.get_link = netxen_nic_get_link,
> >  	.get_eeprom_len = netxen_nic_get_eeprom_len,
> >  	.get_eeprom = netxen_nic_get_eeprom,
> > +	.set_eeprom = netxen_nic_set_eeprom,
> >  	.get_ringparam = netxen_nic_get_ringparam,
> >  	.get_pauseparam = netxen_nic_get_pauseparam,
> >  	.set_pauseparam = netxen_nic_set_pauseparam,
> > diff --git a/drivers/net/netxen/netxen_nic_init.c
> > b/drivers/net/netxen/netxen_nic_init.c index c3e41f3..069436f 100644
> > --- a/drivers/net/netxen/netxen_nic_init.c
> > +++ b/drivers/net/netxen/netxen_nic_init.c
> > @@ -391,6 +391,7 @@ static inline int do_rom_fast_write(stru
> >  	netxen_nic_reg_write(adapter, NETXEN_ROMUSB_ROM_ABYTE_CNT, 3);
> >  	netxen_nic_reg_write(adapter, NETXEN_ROMUSB_ROM_INSTR_OPCODE,
> >  			     M25P_INSTR_PP);
> > +	udelay(100);
>
> why?
>
> maybe just a PCI posting bug?
>
> >  	if (netxen_wait_rom_done(adapter)) {
> >  		netxen_nic_reg_write(adapter, NETXEN_ROMUSB_ROM_ABYTE_CNT, 0);
> >  		return -1;
> > @@ -399,12 +400,13 @@ static inline int do_rom_fast_write(stru
> >  	return netxen_rom_wip_poll(adapter);
> >  }
> >
> > +
> >  static inline int
> >  do_rom_fast_read(struct netxen_adapter *adapter, int addr, int *valp)
> >  {
> >  	netxen_nic_reg_write(adapter, NETXEN_ROMUSB_ROM_ADDRESS, addr);
> >  	netxen_nic_reg_write(adapter, NETXEN_ROMUSB_ROM_ABYTE_CNT, 3);
> > -	udelay(100);		/* prevent bursting on CRB */
> > +	udelay(70);		/* prevent bursting on CRB */
>
> why?
>
> >  	netxen_nic_reg_write(adapter, NETXEN_ROMUSB_ROM_DUMMY_BYTE_CNT, 0);
> >  	netxen_nic_reg_write(adapter, NETXEN_ROMUSB_ROM_INSTR_OPCODE, 0xb);
> >  	if (netxen_wait_rom_done(adapter)) {
> > @@ -413,13 +415,45 @@ do_rom_fast_read(struct netxen_adapter *
> >  	}
> >  	/* reset abyte_cnt and dummy_byte_cnt */
> >  	netxen_nic_reg_write(adapter, NETXEN_ROMUSB_ROM_ABYTE_CNT, 0);
> > -	udelay(100);		/* prevent bursting on CRB */
> > +	udelay(70);		/* prevent bursting on CRB */
>
> why?
>
> >  	netxen_nic_reg_write(adapter, NETXEN_ROMUSB_ROM_DUMMY_BYTE_CNT, 0);
> >
> >  	*valp = netxen_nic_reg_read(adapter, NETXEN_ROMUSB_ROM_RDATA);
> >  	return 0;
> >  }
> >
> > +static inline int
> > +do_rom_fast_read_words(struct netxen_adapter *adapter, int addr,
> > +			u8 *bytes, size_t size)
> > +{
> > +	int addridx = addr;
> > +	int ret = 0;
> > +
> > +	while (addridx < (addr + size)) {
> > +		ret = do_rom_fast_read(adapter, addridx, (int *)bytes);
> > +		if(ret != 0)
>
> add space after 'if'
>
> > +			break;
> > +		bytes += 4;
> > +		addridx += 4;
> > +	}
> > +	return ret;
> > +}
> > +
> > +int
> > +netxen_rom_fast_read_words (struct netxen_adapter *adapter, int addr, u8
> > *bytes, +			size_t size)
> > +{
> > +	int ret;
>
> add blank line after definition of automatic variable
>
> > +	if (rom_lock(adapter) != 0) {
> > +		return -1;
> > +	}
>
> remove braces
>
> > +	ret = do_rom_fast_read_words(adapter, addr, bytes, size);
> > +
> > +	netxen_rom_unlock(adapter);
> > +	return ret;
> > +}
> > +
> >  int netxen_rom_fast_read(struct netxen_adapter *adapter, int addr, int
> > *valp) {
> >  	int ret;
> > @@ -443,20 +477,189 @@ int netxen_rom_fast_write(struct netxen_
> >  	netxen_rom_unlock(adapter);
> >  	return ret;
> >  }
> > +
> > +static inline int do_rom_fast_write_words(struct netxen_adapter
> > *adapter, +						int addr, u8 *bytes, size_t size)
> > +{
> > +	int addridx = addr;
> > +	int data1;
> > +	int data;
> > +	int ret = 0;
> > +	int timeout = 0;
> > +
> > +	while (addridx < (addr + size)) {
> > +		data = *(u32*)bytes;
> > +
> > +		ret = do_rom_fast_write(adapter, addridx, data);
> > +		if(ret == -1){
>
> add space
>
> > +			printk("do_rom_fast_write returned error \n");
>
> naked printk
>
> > +			return ret;
> > +
> > +		}
> > +		timeout = 0;
> > +
> > +		while(1){
> > +			do_rom_fast_read(adapter, addridx, &data1);
> > +
> > +			if(data1 == data){
> > +				break;
> > +			}
>
> kill braces
>
> > +			if(timeout++ >= 300) {
> > +				printk("netxen_nic: Data write didn't succeed"
> > +					" at address %x\n", addridx);
> > +				break;
>
> naked printk
>
> > +			}
> > +		}
> > +
> > +		bytes += 4;
> > +		addridx += 4;
> > +	}
> > +
> > +	return ret;
> > +}
> > +
> > +int netxen_rom_fast_write_words(struct netxen_adapter *adapter, int
> > addr, +					u8 *bytes, size_t size)
> > +{
> > +	int ret = 0;
> > +
> > +	if (rom_lock(adapter) != 0) {
> > +		return -EAGAIN;
> > +	}
>
> kill braces
>
> > +	ret = do_rom_fast_write_words(adapter, addr, bytes, size);
> > +	netxen_rom_unlock(adapter);
> > +	return ret;
> > +}
> > +
> > +int netxen_rom_wrsr(struct netxen_adapter *adapter, int data)
> > +{
> > +	if (netxen_rom_wren(adapter)){
> > +		return -1;
> > +	}
>
> ditto
>
> > +	netxen_crb_writelit_adapter(adapter, NETXEN_ROMUSB_ROM_WDATA, data);
> > +	netxen_crb_writelit_adapter(adapter, NETXEN_ROMUSB_ROM_INSTR_OPCODE,
> > 0x1); +
> > +	if (netxen_wait_rom_done(adapter)) {
> > +		return -1;
> > +	}
>
> ditto
>
> > +	return netxen_rom_wip_poll(adapter);
> > +}
> > +
> > +int netxen_rom_rdsr(struct netxen_adapter *adapter)
> > +{
> > +	int ret;
> > +
> > +	if (rom_lock(adapter) != 0){
> > +		return -1;
> > +	}
>
> ditto
>
> > +	ret = netxen_do_rom_rdsr(adapter);
> > +	netxen_rom_unlock(adapter);
> > +	return ret;
> > +}
> > +
> > +int netxen_backup_crbinit(struct netxen_adapter *adapter)
> > +{
> > +	int ret = FLASH_SUCCESS;
> > +	int val;
> > +	char *buffer = kmalloc(FLASH_SECTOR_SIZE, GFP_KERNEL);
>
> check for NULL
>
> > +	/* unlock sector 63 */
> > +	val = netxen_rom_rdsr(adapter);
> > +	val = val & 0xe3;
> > +	ret = netxen_rom_wrsr(adapter, val);
> > +	if(ret != FLASH_SUCCESS){
> > +		kfree(buffer);
> > +		return -1;
> > +	}
> > +	ret = netxen_rom_wip_poll(adapter);
> > +	if(ret != FLASH_SUCCESS){
> > +		kfree(buffer);
> > +		return -1;
> > +	}
> > +	/* copy  sector 0 to sector 63 */
> > +
> > +	if (netxen_rom_fast_read_words
> > +		(adapter, CRBINIT_START, buffer, FLASH_SECTOR_SIZE) == -1){
>
> function args start on previous line
>
> > +		printk("get_eeprom() fails...\n");
> > +		kfree(buffer);
> > +		return -EIO;
> > +	}
> > +
> > +	ret = netxen_rom_fast_write_words(adapter, FIXED_START, buffer,
> > +					   FLASH_SECTOR_SIZE);
>
> like this
>
> > +	if(ret != FLASH_SUCCESS){
>
> add space after 'if'
>
> > +		kfree(buffer);
> > +		return -1;
> > +	}
> > +
> > +	/* lock sector 63 */
> > +	val = netxen_rom_rdsr(adapter);
> > +	if (!(val & 0x8)) {
> > +		val |= (0x1 << 2);
> > +		/* lock sector 63 */
> > +		if (netxen_rom_wrsr(adapter, val) == 0) {
> > +			ret = netxen_rom_wip_poll(adapter);
> > +			if(ret != FLASH_SUCCESS){
> > +				kfree(buffer);
> > +				return -1;
> > +			}
> > +			/* lock SR writes */
> > +			val = val | 0x80;
> > +			ret = netxen_rom_wip_poll(adapter);
> > +			if(ret != FLASH_SUCCESS){
> > +				kfree(buffer);
> > +				return -1;
> > +			}
> > +		}
> > +	}
> > +	kfree(buffer);
> > +	return ret;
>
> overall, WAY TOO MANY duplicate 'kfree(buffer)' calls.  it is kernel
> style to use 'goto' to jump to a single error handling callsite, rather
> than all this duplication
>
> >  int netxen_do_rom_se(struct netxen_adapter *adapter, int addr)
> >  {
> > -	netxen_rom_wren(adapter);
> > +	if(netxen_rom_wren(adapter) != 0)
> > +		return -1;
> >  	netxen_nic_reg_write(adapter, NETXEN_ROMUSB_ROM_ADDRESS, addr);
> > +	udelay(200);
> >  	netxen_nic_reg_write(adapter, NETXEN_ROMUSB_ROM_ABYTE_CNT, 3);
> > +	udelay(200);
> >  	netxen_nic_reg_write(adapter, NETXEN_ROMUSB_ROM_INSTR_OPCODE,
> > -			     M25P_INSTR_SE);
> > +				M25P_INSTR_SE);
> > +	udelay(200);
>
> why?
>
> PCI posting bugs?
>
> >  	if (netxen_wait_rom_done(adapter)) {
> >  		netxen_nic_reg_write(adapter, NETXEN_ROMUSB_ROM_ABYTE_CNT, 0);
> >  		return -1;
> >  	}
> > +
> >  	return netxen_rom_wip_poll(adapter);
> >  }
> >
> > +void check_erased_flash(struct netxen_adapter *adapter, int addr)
> > +{
> > +	int i;
> > +	int val;
> > +	int count = 0, erased_errors =0;
> > +	int range;
> > +
> > +	if(addr == 0x3e8000)
> > +		range = 0x3f0000;
>
> what do these magic numbers mean?  why aren't they named constants?
>
> > +	else range = addr + FLASH_SECTOR_SIZE;
> > +
> > +	for(i = addr; i < range; i+=4){
> > +		netxen_rom_fast_read(adapter, i, &val);
> > +		if(val != 0xffffffff)
> > +			erased_errors++;
> > +		count++;
> > +	}
> > +
> > +	if(erased_errors)
>
> space after 'if'
>
> > +		printk("0x%x out of 0x%x words fail to be erased "
> > +			"for sector address: %x\n", erased_errors, count, addr);
>
> naked printk
>
> >  int netxen_rom_se(struct netxen_adapter *adapter, int addr)
> >  {
> >  	int ret = 0;
> > @@ -465,6 +668,63 @@ int netxen_rom_se(struct netxen_adapter
> >  	}
> >  	ret = netxen_do_rom_se(adapter, addr);
> >  	netxen_rom_unlock(adapter);
> > +	schedule();
> > +	check_erased_flash(adapter, addr);
> > +	return ret;
>
> why are you calling schedule() here?  more likely you want to call
> msleep(), I'm guessing.
>
> > +int
> > +netxen_flash_erase_sections(struct netxen_adapter *adapter, int start,
> > int end) +{
> > +	int ret = FLASH_SUCCESS;
> > +	int i;
> > +	for (i = start; i < end; i++) {
> > +		ret = netxen_rom_se(adapter, i*FLASH_SECTOR_SIZE);
> > +		if (ret)
> > +			break;
> > +		if (netxen_rom_wip_poll(adapter) != 0) {
> > +			ret = -1;
> > +			break;
> > +		}
> > +	}
> > +	return(ret);
> > +}
> > +
> > +int
> > +netxen_flash_erase_secondary(struct netxen_adapter *adapter)
> > +{
> > +	int ret = FLASH_SUCCESS;
> > +	int start, end;
> > +
> > +	start = SECONDARY_START/FLASH_SECTOR_SIZE;
> > +	end   = USER_START/FLASH_SECTOR_SIZE;
> > +	netxen_flash_erase_sections(adapter, start, end);
> > +
> > +	return(ret);
> > +}
> > +
> > +int
> > +netxen_flash_erase_primary(struct netxen_adapter *adapter)
> > +{
> > +	int ret = FLASH_SUCCESS;
> > +	int start, end;
> > +
> > +	start = PRIMARY_START/FLASH_SECTOR_SIZE;
> > +	end   = SECONDARY_START/FLASH_SECTOR_SIZE;
> > +	ret = netxen_flash_erase_sections(adapter, start, end);
> > +
> > +	return(ret);
> > +}
> > +
> > +int netxen_flash_unlock(struct netxen_adapter *adapter)
> > +{
> > +	int ret = 0;
> > +
> > +	if (netxen_rom_wrsr(adapter, 0) != 0)
> > +		ret = -1;
> > +	if (netxen_rom_wren(adapter) != 0)
> > +		ret = -1;
> > +
> >  	return ret;
> >  }
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