1 files changed, 186 insertions, 0 deletions
diff --git a/arch/alpha/lib/checksum.c b/arch/alpha/lib/checksum.c
new file mode 100644
index 000000000000..89044e6385fe
--- /dev/null
+++ b/arch/alpha/lib/checksum.c
@@ -0,0 +1,186 @@
+/*
+ * arch/alpha/lib/checksum.c
+ *
+ * This file contains network checksum routines that are better done
+ * in an architecture-specific manner due to speed..
+ * Comments in other versions indicate that the algorithms are from RFC1071
+ *
+ * accellerated versions (and 21264 assembly versions ) contributed by
+ *      Rick Gorton     <rick.gorton@alpha-processor.com>
+ */
+ 
+#include <linux/module.h>
+#include <linux/string.h>
+#include <asm/byteorder.h>
+static inline unsigned short from64to16(unsigned long x)
+{
+        /* Using extract instructions is a bit more efficient
+           than the original shift/bitmask version.  */
+        union {
+                unsigned long   ul;
+                unsigned int    ui[2];
+                unsigned short  us[4];
+        } in_v, tmp_v, out_v;
+        in_v.ul = x;
+        tmp_v.ul = (unsigned long) in_v.ui[0] + (unsigned long) in_v.ui[1];
+        /* Since the bits of tmp_v.sh[3] are going to always be zero,
+           we don't have to bother to add that in.  */
+        out_v.ul = (unsigned long) tmp_v.us[0] + (unsigned long) tmp_v.us[1]
+                        + (unsigned long) tmp_v.us[2];
+        /* Similarly, out_v.us[2] is always zero for the final add.  */
+        return out_v.us[0] + out_v.us[1];
+}
+/*
+ * computes the checksum of the TCP/UDP pseudo-header
+ * returns a 16-bit checksum, already complemented.
+ */
+unsigned short int csum_tcpudp_magic(unsigned long saddr,
+                                   unsigned long daddr,
+                                   unsigned short len,
+                                   unsigned short proto,
+                                   unsigned int sum)
+{
+        return ~from64to16(saddr + daddr + sum +
+                ((unsigned long) ntohs(len) << 16) +
+                ((unsigned long) proto << 8));
+}
+unsigned int csum_tcpudp_nofold(unsigned long saddr,
+                                   unsigned long daddr,
+                                   unsigned short len,
+                                   unsigned short proto,
+                                   unsigned int sum)
+{
+        unsigned long result;
+        result = (saddr + daddr + sum +
+                  ((unsigned long) ntohs(len) << 16) +
+                  ((unsigned long) proto << 8));
+        /* Fold down to 32-bits so we don't lose in the typedef-less 
+           network stack.  */
+        /* 64 to 33 */
+        result = (result & 0xffffffff) + (result >> 32);
+        /* 33 to 32 */
+        result = (result & 0xffffffff) + (result >> 32);
+        return result;
+}
+/*
+ * Do a 64-bit checksum on an arbitrary memory area..
+ *
+ * This isn't a great routine, but it's not _horrible_ either. The
+ * inner loop could be unrolled a bit further, and there are better
+ * ways to do the carry, but this is reasonable.
+ */
+static inline unsigned long do_csum(const unsigned char * buff, int len)
+{
+        int odd, count;
+        unsigned long result = 0;
+        if (len <= 0)
+                goto out;
+        odd = 1 & (unsigned long) buff;
+        if (odd) {
+                result = *buff << 8;
+                len--;
+                buff++;
+        }
+        count = len >> 1;               /* nr of 16-bit words.. */
+        if (count) {
+                if (2 & (unsigned long) buff) {
+                        result += *(unsigned short *) buff;
+                        count--;
+                        len -= 2;
+                        buff += 2;
+                }
+                count >>= 1;            /* nr of 32-bit words.. */
+                if (count) {
+                        if (4 & (unsigned long) buff) {
+                                result += *(unsigned int *) buff;
+                                count--;
+                                len -= 4;
+                                buff += 4;
+                        }
+                        count >>= 1;    /* nr of 64-bit words.. */
+                        if (count) {
+                                unsigned long carry = 0;
+                                do {
+                                        unsigned long w = *(unsigned long *) buff;
+                                        count--;
+                                        buff += 8;
+                                        result += carry;
+                                        result += w;
+                                        carry = (w > result);
+                                } while (count);
+                                result += carry;
+                                result = (result & 0xffffffff) + (result >> 32);
+                        }
+                        if (len & 4) {
+                                result += *(unsigned int *) buff;
+                                buff += 4;
+                        }
+                }
+                if (len & 2) {
+                        result += *(unsigned short *) buff;
+                        buff += 2;
+                }
+        }
+        if (len & 1)
+                result += *buff;
+        result = from64to16(result);
+        if (odd)
+                result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
+out:
+        return result;
+}
+/*
+ *      This is a version of ip_compute_csum() optimized for IP headers,
+ *      which always checksum on 4 octet boundaries.
+ */
+unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl)
+{
+        return ~do_csum(iph,ihl*4);
+}
+/*
+ * computes the checksum of a memory block at buff, length len,
+ * and adds in "sum" (32-bit)
+ *
+ * returns a 32-bit number suitable for feeding into itself
+ * or csum_tcpudp_magic
+ *
+ * this function must be called with even lengths, except
+ * for the last fragment, which may be odd
+ *
+ * it's best to have buff aligned on a 32-bit boundary
+ */
+unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum)
+{
+        unsigned long result = do_csum(buff, len);
+        /* add in old sum, and carry.. */
+        result += sum;
+        /* 32+c bits -> 32 bits */
+        result = (result & 0xffffffff) + (result >> 32);
+        return result;
+}
+EXPORT_SYMBOL(csum_partial);
+/*
+ * this routine is used for miscellaneous IP-like checksums, mainly
+ * in icmp.c
+ */
+unsigned short ip_compute_csum(unsigned char * buff, int len)
+{
+        return ~from64to16(do_csum(buff,len));
+}

diff --git a/arch/alpha/lib/checksum.c b/arch/alpha/lib/checksum.c new file mode 100644 index 000000000000..89044e6385fe --- /dev/null +++ b/arch/alpha/lib/checksum.c
@@ -0,0 +1,186 @@
	1	/*
	2	* arch/alpha/lib/checksum.c
	3	*
	4	* This file contains network checksum routines that are better done
	5	* in an architecture-specific manner due to speed..
	6	* Comments in other versions indicate that the algorithms are from RFC1071
	7	*
	8	* accellerated versions (and 21264 assembly versions ) contributed by
	9	* Rick Gorton <rick.gorton@alpha-processor.com>
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/string.h>
	14
	15	#include <asm/byteorder.h>
	16
	17	static inline unsigned short from64to16(unsigned long x)
	18	{
	19	/* Using extract instructions is a bit more efficient
	20	than the original shift/bitmask version. */
	21
	22	union {
	23	unsigned long ul;
	24	unsigned int ui[2];
	25	unsigned short us[4];
	26	} in_v, tmp_v, out_v;
	27
	28	in_v.ul = x;
	29	tmp_v.ul = (unsigned long) in_v.ui[0] + (unsigned long) in_v.ui[1];
	30
	31	/* Since the bits of tmp_v.sh[3] are going to always be zero,
	32	we don't have to bother to add that in. */
	33	out_v.ul = (unsigned long) tmp_v.us[0] + (unsigned long) tmp_v.us[1]
	34	+ (unsigned long) tmp_v.us[2];
	35
	36	/* Similarly, out_v.us[2] is always zero for the final add. */
	37	return out_v.us[0] + out_v.us[1];
	38	}
	39
	40	/*
	41	* computes the checksum of the TCP/UDP pseudo-header
	42	* returns a 16-bit checksum, already complemented.
	43	*/
	44	unsigned short int csum_tcpudp_magic(unsigned long saddr,
	45	unsigned long daddr,
	46	unsigned short len,
	47	unsigned short proto,
	48	unsigned int sum)
	49	{
	50	return ~from64to16(saddr + daddr + sum +
	51	((unsigned long) ntohs(len) << 16) +
	52	((unsigned long) proto << 8));
	53	}
	54
	55	unsigned int csum_tcpudp_nofold(unsigned long saddr,
	56	unsigned long daddr,
	57	unsigned short len,
	58	unsigned short proto,
	59	unsigned int sum)
	60	{
	61	unsigned long result;
	62
	63	result = (saddr + daddr + sum +
	64	((unsigned long) ntohs(len) << 16) +
	65	((unsigned long) proto << 8));
	66
	67	/* Fold down to 32-bits so we don't lose in the typedef-less
	68	network stack. */
	69	/* 64 to 33 */
	70	result = (result & 0xffffffff) + (result >> 32);
	71	/* 33 to 32 */
	72	result = (result & 0xffffffff) + (result >> 32);
	73	return result;
	74	}
	75
	76	/*
	77	* Do a 64-bit checksum on an arbitrary memory area..
	78	*
	79	* This isn't a great routine, but it's not _horrible_ either. The
	80	* inner loop could be unrolled a bit further, and there are better
	81	* ways to do the carry, but this is reasonable.
	82	*/
	83	static inline unsigned long do_csum(const unsigned char * buff, int len)
	84	{
	85	int odd, count;
	86	unsigned long result = 0;
	87
	88	if (len <= 0)
	89	goto out;
	90	odd = 1 & (unsigned long) buff;
	91	if (odd) {
	92	result = *buff << 8;
	93	len--;
	94	buff++;
	95	}
	96	count = len >> 1; /* nr of 16-bit words.. */
	97	if (count) {
	98	if (2 & (unsigned long) buff) {
	99	result += (unsigned short ) buff;
	100	count--;
	101	len -= 2;
	102	buff += 2;
	103	}
	104	count >>= 1; /* nr of 32-bit words.. */
	105	if (count) {
	106	if (4 & (unsigned long) buff) {
	107	result += (unsigned int ) buff;
	108	count--;
	109	len -= 4;
	110	buff += 4;
	111	}
	112	count >>= 1; /* nr of 64-bit words.. */
	113	if (count) {
	114	unsigned long carry = 0;
	115	do {
	116	unsigned long w = (unsigned long ) buff;
	117	count--;
	118	buff += 8;
	119	result += carry;
	120	result += w;
	121	carry = (w > result);
	122	} while (count);
	123	result += carry;
	124	result = (result & 0xffffffff) + (result >> 32);
	125	}
	126	if (len & 4) {
	127	result += (unsigned int ) buff;
	128	buff += 4;
	129	}
	130	}
	131	if (len & 2) {
	132	result += (unsigned short ) buff;
	133	buff += 2;
	134	}
	135	}
	136	if (len & 1)
	137	result += *buff;
	138	result = from64to16(result);
	139	if (odd)
	140	result = ((result >> 8) & 0xff) \| ((result & 0xff) << 8);
	141	out:
	142	return result;
	143	}
	144
	145	/*
	146	* This is a version of ip_compute_csum() optimized for IP headers,
	147	* which always checksum on 4 octet boundaries.
	148	*/
	149	unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl)
	150	{
	151	return ~do_csum(iph,ihl*4);
	152	}
	153
	154	/*
	155	* computes the checksum of a memory block at buff, length len,
	156	* and adds in "sum" (32-bit)
	157	*
	158	* returns a 32-bit number suitable for feeding into itself
	159	* or csum_tcpudp_magic
	160	*
	161	* this function must be called with even lengths, except
	162	* for the last fragment, which may be odd
	163	*
	164	* it's best to have buff aligned on a 32-bit boundary
	165	*/
	166	unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum)
	167	{
	168	unsigned long result = do_csum(buff, len);
	169
	170	/* add in old sum, and carry.. */
	171	result += sum;
	172	/* 32+c bits -> 32 bits */
	173	result = (result & 0xffffffff) + (result >> 32);
	174	return result;
	175	}
	176
	177	EXPORT_SYMBOL(csum_partial);
	178
	179	/*
	180	* this routine is used for miscellaneous IP-like checksums, mainly
	181	* in icmp.c
	182	*/
	183	unsigned short ip_compute_csum(unsigned char * buff, int len)
	184	{
	185	return ~from64to16(do_csum(buff,len));
	186	}