Date:	Sat, 4 Oct 2008 11:48:39 -0700
From:	"Mandeep Baines" <msb@...gle.com>
To:	jeff@...zik.org, netdev@...r.kernel.org, davem@...emloft.net
Cc:	nil@...gle.com, thockin@...gle.com
Subject: Re: ethtool: add support for block writing of EEPROMs

Hi Jeff,

Just wanted to know if this was in your queue.

http://marc.info/?l=linux-netdev&m=121381113108841

Could be used for restoring e1000es.

You could back up the EEPROM of a good NIC:

ethtool -e eth0 > eth0.eeprom

And then restore it on a bad NIC:

ethtool -E eth0 < eth0.eeprom

Then fix up the MAC address.

Regards,
Mandeep

On Wed, Jun 18, 2008 at 10:38 AM, Mandeep Singh Baines <msb@...gle.com> wrote:
> EEPROM write only supports byte writing. Add support for writing
> an arbitrary number of bytes at an arbitrary offset.
>
> Signed-off-by: Mandeep Singh Baines <msb@...gle.com>
> ---
>  ethtool.8 |   12 ++++++++----
>  ethtool.c |   58 ++++++++++++++++++++++++++++++++++++++++++++--------------
>  2 files changed, 52 insertions(+), 18 deletions(-)
>
> diff --git a/ethtool.8 b/ethtool.8
> index cc6a46e..90d160a 100644
> --- a/ethtool.8
> +++ b/ethtool.8
> @@ -144,6 +144,8 @@ ethtool \- Display or change ethernet card settings
>  .IR N ]
>  .RB [ offset
>  .IR N ]
> +.RB [ length
> +.IR N ]
>  .RB [ value
>  .IR N ]
>
> @@ -265,10 +267,12 @@ length and offset parameters allow dumping certain portions of the EEPROM.
>  Default is to dump the entire EEPROM.
>  .TP
>  .B \-E \-\-change\-eeprom
> -Changes EEPROM byte for the specified ethernet device.  offset and value
> -specify which byte and it's new value.  Because of the persistent nature
> -of writing to the EEPROM, a device-specific magic key must be specified
> -to prevent the accidental writing to the EEPROM.
> +If value is specified, changes EEPROM byte for the specified ethernet device.
> +offset and value specify which byte and it's new value. If value is not
> +specified, stdin is read and written to the EEPROM. The length and offset
> +parameters allow writing to certain portions of the EEPROM.
> +Because of the persistent nature of writing to the EEPROM, a device-specific
> +magic key must be specified to prevent the accidental writing to the EEPROM.
>  .TP
>  .B \-k \-\-show\-offload
>  Queries the specified ethernet device for offload information.
> diff --git a/ethtool.c b/ethtool.c
> index a668b49..3fce21c 100644
> --- a/ethtool.c
> +++ b/ethtool.c
> @@ -163,6 +163,7 @@ static struct option {
>     { "-E", "--change-eeprom", MODE_SEEPROM, "Change bytes in device EEPROM",
>                "               [ magic N ]\n"
>                "               [ offset N ]\n"
> +               "               [ length N ]\n"
>                "               [ value N ]\n" },
>     { "-r", "--negotiate", MODE_NWAY_RST, "Restart N-WAY negotation" },
>     { "-p", "--identify", MODE_PHYS_ID, "Show visible port identification (e.g. blinking)",
> @@ -264,8 +265,9 @@ static int geeprom_offset = 0;
>  static int geeprom_length = -1;
>  static int seeprom_changed = 0;
>  static int seeprom_magic = 0;
> -static int seeprom_offset = -1;
> -static int seeprom_value = 0;
> +static int seeprom_length = -1;
> +static int seeprom_offset = 0;
> +static int seeprom_value = EOF;
>  static enum {
>        ONLINE=0,
>        OFFLINE,
> @@ -300,6 +302,7 @@ static struct cmdline_info cmdline_geeprom[] = {
>  static struct cmdline_info cmdline_seeprom[] = {
>        { "magic", CMDL_INT, &seeprom_magic, NULL },
>        { "offset", CMDL_INT, &seeprom_offset, NULL },
> +       { "length", CMDL_INT, &seeprom_length, NULL },
>        { "value", CMDL_INT, &seeprom_value, NULL },
>  };
>
> @@ -1920,22 +1923,49 @@ static int do_geeprom(int fd, struct ifreq *ifr)
>  static int do_seeprom(int fd, struct ifreq *ifr)
>  {
>        int err;
> -       struct {
> -               struct ethtool_eeprom eeprom;
> -               u8 data;
> -       } edata;
> -
> -       edata.eeprom.cmd = ETHTOOL_SEEPROM;
> -       edata.eeprom.len = 1;
> -       edata.eeprom.offset = seeprom_offset;
> -       edata.eeprom.magic = seeprom_magic;
> -       edata.data = seeprom_value;
> -       ifr->ifr_data = (caddr_t)&edata.eeprom;
> +       struct ethtool_drvinfo drvinfo;
> +       struct ethtool_eeprom *eeprom;
> +
> +       drvinfo.cmd = ETHTOOL_GDRVINFO;
> +       ifr->ifr_data = (caddr_t)&drvinfo;
> +       err = ioctl(fd, SIOCETHTOOL, ifr);
> +       if (err < 0) {
> +               perror("Cannot get driver information");
> +               return 74;
> +       }
> +
> +       if (seeprom_value != EOF)
> +               seeprom_length = 1;
> +
> +       if (seeprom_length <= 0)
> +               seeprom_length = drvinfo.eedump_len;
> +
> +       if (drvinfo.eedump_len < seeprom_offset + seeprom_length)
> +               seeprom_length = drvinfo.eedump_len - seeprom_offset;
> +
> +       eeprom = calloc(1, sizeof(*eeprom)+seeprom_length);
> +       if (!eeprom) {
> +               perror("Cannot allocate memory for EEPROM data");
> +               return 75;
> +       }
> +
> +       eeprom->cmd = ETHTOOL_SEEPROM;
> +       eeprom->len = seeprom_length;
> +       eeprom->offset = seeprom_offset;
> +       eeprom->magic = seeprom_magic;
> +       eeprom->data[0] = seeprom_value;
> +
> +       /* Multi-byte write: read input from stdin */
> +       if (seeprom_value == EOF)
> +               eeprom->len = fread(eeprom->data, 1, eeprom->len, stdin);
> +
> +       ifr->ifr_data = (caddr_t)eeprom;
>        err = ioctl(fd, SIOCETHTOOL, ifr);
>        if (err < 0) {
>                perror("Cannot set EEPROM data");
> -               return 87;
> +               err = 87;
>        }
> +       free(eeprom);
>
>        return err;
>  }
> --
> 1.5.2.5
>
>
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