Add optimized implementations of in_cksum_skip() and related functions

for sparc64.

1 files changed, 253 insertions, 0 deletions

diff --git a/sys/sparc64/sparc64/in_cksum.c b/sys/sparc64/sparc64/in_cksum.c
new file mode 100644
index 000000000000..25b1955ac5a1
--- /dev/null
+++ b/sys/sparc64/sparc64/in_cksum.c
@@ -0,0 +1,253 @@
+/*-
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+/*-
+ * Copyright (c) 2001 by Thomas Moestl <tmm@FreeBSD.org>.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+ * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *	from tahoe:	in_cksum.c	1.2	86/01/05
+ *	from:		@(#)in_cksum.c	1.3 (Berkeley) 1/19/91
+ * 	from: FreeBSD: src/sys/i386/i386/in_cksum.c,v 1.22 2000/11/25
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/mbuf.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+
+#include <machine/in_cksum.h>
+
+/*
+ * Checksum routine for Internet Protocol family headers.
+ *
+ * This routine is very heavily used in the network
+ * code and should be modified for each CPU to be as fast as possible.
+ *
+ * This implementation is a sparc64 version. Most code was taken over and
+ * adapted from the i386. Some optimizations were changed to achieve (hopefully)
+ * better performance.
+ * This uses 64 bit loads, but 32 bit additions due to the lack of a 64-bit
+ * add-with-carry operation.
+ */
+
+/*
+ * REDUCE() is actually not used that frequently... maybe a C implementation
+ * would suffice.
+ */
+#define REDUCE(sum, tmp) __asm __volatile( \
+	"sll %2, 16, %1\n" \
+	"addcc %2, %1, %0\n" \
+	"srl %0, 16, %0\n" \
+	"addc %0, 0, %0" : "=r" (sum), "=r" (tmp) : "0" (sum))
+
+/*
+ * Note that some of these macros depend on the flags being preserved between
+ * calls, so they should not be intermixed with other C statements.
+ */
+#define LD64_ADD32(sum, tmp, addr, n, mod) __asm __volatile( \
+	"ldx [%3 + " #n "], %1\n" \
+	"add" #mod " %2, %1, %0\n" \
+	"srlx %1, 32, %1\n" \
+	"addccc %0, %1, %0" : "=r" (sum), "=r" (tmp) : "0" (sum), "r" (addr))
+
+#define LD32_ADD32(sum, tmp, addr, n, mod) __asm __volatile( \
+	"lduw [%3 + " #n "], %1\n" \
+	"add" #mod " %2, %1, %0\n" \
+	: "=r" (sum), "=r" (tmp) : "0" (sum), "r" (addr))
+
+#define MOP(sum) __asm __volatile( \
+	"addc %1, 0, %0" : "=r" (sum) : "0" (sum))
+
+u_short
+in_cksum_skip(struct mbuf *m, int len, int skip)
+{
+	u_short *w;
+	unsigned long tmp, sum = 0;
+	int mlen = 0;
+	int byte_swapped = 0;
+	u_short	su = 0;
+
+	len -= skip;
+	for (; skip > 0 && m != NULL; m = m->m_next) {
+		if (m->m_len > skip) {
+			mlen = m->m_len - skip;
+			w = (u_short *)(mtod(m, u_char *) + skip);
+			goto skip_start;
+		} else
+			skip -= m->m_len;
+	}
+
+	for (; m != NULL && len > 0; m = m->m_next) {
+		if (m->m_len == 0)
+			continue;
+		w = mtod(m, u_short *);
+		if (mlen == -1) {
+			/*
+			 * The first byte of this mbuf is the continuation
+			 * of a word spanning between this mbuf and the
+			 * last mbuf.
+			 *
+			 * The high order byte of su is already saved when
+			 * scanning previous mbuf.  sum was REDUCEd when we
+			 * found mlen == -1
+			 */
+			sum += su | *(u_char *)w;
+			w = (u_short *)((u_char *)w + 1);
+			mlen = m->m_len - 1;
+			len--;
+		} else
+			mlen = m->m_len;
+skip_start:
+		if (len < mlen)
+			mlen = len;
+		len -= mlen;
+		/*
+		 * Force to a 8-byte boundary first so that we can use
+		 * LD64_ADD32.
+		 */
+		if (((u_long)w & 7) != 0) {
+			REDUCE(sum, tmp);
+			if (((u_long)w & 1) != 0 && mlen >= 1) {
+				sum <<= 8;
+				su = *(u_char *)w << 8;
+				w = (u_short *)((u_char *)w + 1);
+				mlen--;
+				byte_swapped = 1;
+			}
+			if (((u_long)w & 2) != 0 && mlen >= 2) {
+				sum += *w++;
+				mlen -= 2;
+			}
+			if (((u_long)w & 4) != 0 && mlen >= 4) {
+				LD32_ADD32(sum, tmp, w, 0, cc);
+				MOP(sum);
+				w += 2;
+				mlen -= 4;
+			}
+		}
+		/*
+		 * Do as much of the checksum as possible 64 bits at at time.
+		 * In fact, this loop is unrolled to make overhead from
+		 * branches &c small.
+		 */
+		for (; mlen >= 64; mlen -= 64) {
+			LD64_ADD32(sum, tmp, w, 0, cc);
+			LD64_ADD32(sum, tmp, w, 8, ccc);
+			LD64_ADD32(sum, tmp, w, 16, ccc);
+			LD64_ADD32(sum, tmp, w, 24, ccc);
+			LD64_ADD32(sum, tmp, w, 32, ccc);
+			LD64_ADD32(sum, tmp, w, 40, ccc);
+			LD64_ADD32(sum, tmp, w, 48, ccc);
+			LD64_ADD32(sum, tmp, w, 56, ccc);
+			MOP(sum);
+			w += 32;
+		}
+		if (mlen >= 32) {
+			LD64_ADD32(sum, tmp, w, 0, cc);
+			LD64_ADD32(sum, tmp, w, 8, ccc);
+			LD64_ADD32(sum, tmp, w, 16, ccc);
+			LD64_ADD32(sum, tmp, w, 24, ccc);
+			MOP(sum);
+			w += 16;
+			mlen -= 32;
+		}
+		if (mlen >= 16) {
+			LD64_ADD32(sum, tmp, w, 0, cc);
+			LD64_ADD32(sum, tmp, w, 8, ccc);
+			MOP(sum);
+			w += 8;
+			mlen -= 16;
+		}
+		if (mlen >= 8) {
+			LD64_ADD32(sum, tmp, w, 0, cc);
+			MOP(sum);
+			w += 4;
+			mlen -= 8;
+		}
+		REDUCE(sum, tmp);
+		while ((mlen -= 2) >= 0)
+			sum += *w++;
+		if (byte_swapped) {
+			sum <<= 8;
+			byte_swapped = 0;
+			if (mlen == -1) {
+				su |= *(u_char *)w;
+				sum += su;
+				mlen = 0;
+			} else
+				mlen = -1;
+		} else if (mlen == -1) {
+			/*
+			 * This mbuf has odd number of bytes.
+			 * There could be a word split betwen
+			 * this mbuf and the next mbuf.
+			 * Save the last byte (to prepend to next mbuf).
+			 */
+			su = *(u_char *)w << 8;
+		}
+	}
+
+	if (len)
+		printf("%s: out of data by %d\n", __func__, len);
+	if (mlen == -1) {
+		/* The last mbuf has odd # of bytes. Follow the
+		   standard (the odd byte is shifted left by 8 bits) */
+		sum += su & 0xff00;
+	}
+	REDUCE(sum, tmp);
+	return (~sum & 0xffff);
+}