diff options
author | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
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committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/cris/arch-v10/lib/old_checksum.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/cris/arch-v10/lib/old_checksum.c')
-rw-r--r-- | kernel/arch/cris/arch-v10/lib/old_checksum.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/kernel/arch/cris/arch-v10/lib/old_checksum.c b/kernel/arch/cris/arch-v10/lib/old_checksum.c new file mode 100644 index 000000000..8f79163f1 --- /dev/null +++ b/kernel/arch/cris/arch-v10/lib/old_checksum.c @@ -0,0 +1,86 @@ +/* + * INET An implementation of the TCP/IP protocol suite for the LINUX + * operating system. INET is implemented using the BSD Socket + * interface as the means of communication with the user level. + * + * IP/TCP/UDP checksumming routines + * + * Authors: Jorge Cwik, <jorge@laser.satlink.net> + * Arnt Gulbrandsen, <agulbra@nvg.unit.no> + * Tom May, <ftom@netcom.com> + * Lots of code moved from tcp.c and ip.c; see those files + * for more names. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <net/checksum.h> +#include <net/module.h> + +#undef PROFILE_CHECKSUM + +#ifdef PROFILE_CHECKSUM +/* these are just for profiling the checksum code with an oscillioscope.. uh */ +#if 0 +#define BITOFF *((unsigned char *)0xb0000030) = 0xff +#define BITON *((unsigned char *)0xb0000030) = 0x0 +#endif +#include <asm/io.h> +#define CBITON LED_ACTIVE_SET(1) +#define CBITOFF LED_ACTIVE_SET(0) +#define BITOFF +#define BITON +#else +#define BITOFF +#define BITON +#define CBITOFF +#define CBITON +#endif + +/* + * computes a partial checksum, e.g. for TCP/UDP fragments + */ + +#include <asm/delay.h> + +__wsum csum_partial(const void *p, int len, __wsum __sum) +{ + u32 sum = (__force u32)__sum; + const u16 *buff = p; + /* + * Experiments with ethernet and slip connections show that buff + * is aligned on either a 2-byte or 4-byte boundary. + */ + const void *endMarker = p + len; + const void *marker = endMarker - (len % 16); +#if 0 + if((int)buff & 0x3) + printk("unaligned buff %p\n", buff); + __delay(900); /* extra delay of 90 us to test performance hit */ +#endif + BITON; + while (buff < marker) { + sum += *buff++; + sum += *buff++; + sum += *buff++; + sum += *buff++; + sum += *buff++; + sum += *buff++; + sum += *buff++; + sum += *buff++; + } + marker = endMarker - (len % 2); + while (buff < marker) + sum += *buff++; + + if (endMarker > buff) + sum += *(const u8 *)buff; /* add extra byte separately */ + + BITOFF; + return (__force __wsum)sum; +} + +EXPORT_SYMBOL(csum_partial); |