Messages in this thread Patch in this message | | | Subject | [PATCH] lib/vsprintf.c: Add %pMF to format FDDI bit reversed MAC addresses | From | Joe Perches <> | Date | Thu, 07 Jan 2010 10:23:45 -0800 |
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On Mon, 2010-01-04 at 23:43 +0000, Maciej W. Rozycki wrote: > The example below shows an address, and the sequence of bits or symbols > that would be transmitted when the address is used in the Source Address > or Destination Address fields on the MAC header. The transmission line > shows the address bits in the order transmitted, from left to right. For > IEEE 802 LANs these correspond to actual bits on the medium. The FDDI > symbols line shows how the FDDI PHY sends the address bits as encoded > symbols. > > MSB: 35:7B:12:00:00:01 > Canonical: AC-DE-48-00-00-80 > Transmission: 00110101 01111011 00010010 00000000 00000000 00000001 > FDDI Symbols: 35 7B 12 00 00 01" > > Please note that this address has its group bit clear. > > This notation is also defined in the "FDDI MEDIA ACCESS CONTROL-2 > (MAC-2)" (X3T9/92-120) document although that book does not have a need > to use the MSB form and it's skipped.
Adds 56 bytes to object size
New: $ size lib/vsprintf.o text data bss dec hex filename 8714 0 2 8716 220c lib/vsprintf.o old: $ size lib/vsprintf.o text data bss dec hex filename 8658 0 2 8660 21d4 lib/vsprintf.o
Signed-off-by: Joe Perches <joe@perches.com> diff --git a/lib/vsprintf.c b/lib/vsprintf.c index d4996cf..36959cc 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -25,6 +25,7 @@ #include <linux/kallsyms.h> #include <linux/uaccess.h> #include <linux/ioport.h> +#include <linux/bitrev.h> #include <net/addrconf.h> #include <asm/page.h> /* for PAGE_SIZE */ @@ -675,17 +676,37 @@ static char *resource_string(char *buf, char *end, struct resource *res, return string(buf, end, sym, spec); } +static u8 mac_byte(u8 val) +{ + return val; +} + +static u8 mac_byte_rev(u8 val) +{ + return bitrev8(val); +} + static char *mac_address_string(char *buf, char *end, u8 *addr, struct printf_spec spec, const char *fmt) { char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; char *p = mac_addr; int i; + u8 (*mac_byte_fn)(u8 val); + char separator; + + if (fmt[1] == 'F') { /* FDDI canonical format */ + mac_byte_fn = mac_byte_rev; + separator = '-'; + } else { + mac_byte_fn = mac_byte; + separator = ':'; + } for (i = 0; i < 6; i++) { - p = pack_hex_byte(p, addr[i]); + p = pack_hex_byte(p, mac_byte_fn(addr[i])); if (fmt[0] == 'M' && i != 5) - *p++ = ':'; + *p++ = separator; } *p = '\0'; @@ -896,6 +917,10 @@ static char *uuid_string(char *buf, char *end, const u8 *addr, * - 'M' For a 6-byte MAC address, it prints the address in the * usual colon-separated hex notation * - 'm' For a 6-byte MAC address, it prints the hex address without colons + * - 'MF' For a 6-byte MAC FDDI address, it prints the address + * with a dash-separated hex notation with bit reversed bytes + * - 'mF' For a 6-byte MAC FDDI address, it prints the address + * in hex notation without separators with bit reversed bytes * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) * IPv6 uses colon separated network-order 16 bit hex with leading 0's @@ -939,6 +964,7 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr, return resource_string(buf, end, ptr, spec, fmt); case 'M': /* Colon separated: 00:01:02:03:04:05 */ case 'm': /* Contiguous: 000102030405 */ + /* [mM]F (FDDI, bit reversed) */ return mac_address_string(buf, end, ptr, spec, fmt); case 'I': /* Formatted IP supported * 4: 1.2.3.4
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