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Use asm versions of in_cksum() and friends.
This commit is contained in:
Olivier Houchard
parent
530d1c7646
commit
0f18d3256d
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=146594
@ -70,22 +70,6 @@ __FBSDID("$FreeBSD$");
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ADDCARRY(sum); \
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}
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static const u_int32_t in_masks[] = {
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#ifndef __ARMEB__
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/*0 bytes*/ /*1 byte*/ /*2 bytes*/ /*3 bytes*/
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0x00000000, 0x000000FF, 0x0000FFFF, 0x00FFFFFF, /* offset 0 */
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0x00000000, 0x0000FF00, 0x00FFFF00, 0xFFFFFF00, /* offset 1 */
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0x00000000, 0x00FF0000, 0xFFFF0000, 0xFFFF0000, /* offset 2 */
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0x00000000, 0xFF000000, 0xFF000000, 0xFF000000, /* offset 3 */
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#else
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/*0 bytes*/ /*1 byte*/ /*2 bytes*/ /*3 bytes*/
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0x00000000, 0xFF000000, 0xFFFF0000, 0xFFFFFF00, /* offset 0 */
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0x00000000, 0x00FF0000, 0x00FFFF00, 0x00FFFFFF, /* offset 1 */
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0x00000000, 0x0000FF00, 0x0000FFFF, 0x0000FFFF, /* offset 2 */
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0x00000000, 0x000000FF, 0x000000FF, 0x000000FF, /* offset 3 */
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#endif
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};
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union l_util {
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u_int16_t s[2];
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u_int32_t l;
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@ -96,87 +80,6 @@ union q_util {
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u_int64_t q;
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};
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static u_int64_t
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in_cksumdata(const void *buf, int len)
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{
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const u_int32_t *lw = (const u_int32_t *) buf;
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u_int64_t sum = 0;
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u_int64_t prefilled;
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int offset;
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union q_util q_util;
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if ((3 & (long) lw) == 0 && len == 20) {
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sum = (u_int64_t) lw[0] + lw[1] + lw[2] + lw[3] + lw[4];
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REDUCE32;
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return sum;
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}
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if ((offset = 3 & (long) lw) != 0) {
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const u_int32_t *masks = in_masks + (offset << 2);
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lw = (u_int32_t *) (((long) lw) - offset);
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sum = *lw++ & masks[len >= 3 ? 3 : len];
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len -= 4 - offset;
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if (len <= 0) {
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REDUCE32;
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return sum;
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}
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}
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#if 0
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/*
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* Force to cache line boundary.
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*/
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offset = 32 - (0x1f & (long) lw);
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if (offset < 32 && len > offset) {
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len -= offset;
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if (4 & offset) {
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sum += (u_int64_t) lw[0];
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lw += 1;
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}
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if (8 & offset) {
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sum += (u_int64_t) lw[0] + lw[1];
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lw += 2;
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}
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if (16 & offset) {
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sum += (u_int64_t) lw[0] + lw[1] + lw[2] + lw[3];
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lw += 4;
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}
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}
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#endif
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/*
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* access prefilling to start load of next cache line.
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* then add current cache line
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* save result of prefilling for loop iteration.
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*/
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prefilled = lw[0];
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while ((len -= 32) >= 4) {
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u_int64_t prefilling = lw[8];
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sum += prefilled + lw[1] + lw[2] + lw[3]
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+ lw[4] + lw[5] + lw[6] + lw[7];
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lw += 8;
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prefilled = prefilling;
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}
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if (len >= 0) {
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sum += prefilled + lw[1] + lw[2] + lw[3]
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+ lw[4] + lw[5] + lw[6] + lw[7];
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lw += 8;
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} else {
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len += 32;
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}
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while ((len -= 16) >= 0) {
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sum += (u_int64_t) lw[0] + lw[1] + lw[2] + lw[3];
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lw += 4;
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}
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len += 16;
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while ((len -= 4) >= 0) {
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sum += (u_int64_t) *lw++;
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}
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len += 4;
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if (len > 0)
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sum += (u_int64_t) (in_masks[len] & *lw);
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REDUCE32;
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return sum;
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}
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u_short
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in_addword(u_short a, u_short b)
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{
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@ -229,9 +132,9 @@ in_cksum_skip(struct mbuf *m, int len, int skip)
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mlen = len;
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if ((clen ^ (int) addr) & 1)
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sum += in_cksumdata(addr, mlen) << 8;
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sum += do_cksum(addr, mlen) << 8;
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else
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sum += in_cksumdata(addr, mlen);
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sum += do_cksum(addr, mlen);
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clen += mlen;
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len -= mlen;
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@ -239,12 +142,3 @@ in_cksum_skip(struct mbuf *m, int len, int skip)
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REDUCE16;
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return (~sum & 0xffff);
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}
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u_int in_cksum_hdr(const struct ip *ip)
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{
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u_int64_t sum = in_cksumdata(ip, sizeof(struct ip));
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union q_util q_util;
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union l_util l_util;
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REDUCE16;
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return (~sum & 0xffff);
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}
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@ -92,142 +92,11 @@ ENTRY(in_cksum)
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ldmfd sp!, {r4-r11,pc}
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#ifdef INET
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/*
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* int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len)
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*
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* Entry:
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* r0 m
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* r1 nxt
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* r2 off
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* r3 len
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*/
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/* LINTSTUB: Func: int in4_cksum(struct mbuf *, u_int8_t, int, int) */
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ENTRY(in4_cksum)
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stmfd sp!, {r4-r11,lr}
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mov r8, #0x00 /* Accumulate sum in r8 */
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/*
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* First, deal with a pseudo header, if present
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*/
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ldr r6, [r0, #(M_DATA)]
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cmp r1, #0x00
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beq .Lin4_cksum_skip_entry
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#ifdef __XSCALE__
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pld [r6, #(IP_SRC)]
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#endif
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add r4, r6, #(IP_SRC)
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ands r4, r4, #0x03
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add r8, r1, r3 /* sum = nxt + len */
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addne pc, pc, r4, lsl #5 /* Handle alignment of pseudo header */
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nop
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/* 0x00: Data 32-bit aligned */
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ldr r5, [r6, #(IP_SRC)]
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ldr r4, [r6, #(IP_DST)]
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b .Lin4_cksum_add_ips
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nop
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nop
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nop
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nop
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nop
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/* 0x01: Data 8-bit aligned */
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ldr r4, [r6, #(IP_SRC - 1)] /* BE:r4 = x012 LE:r4 = 210x */
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ldr r5, [r6, #(IP_SRC + 3)] /* BE:r5 = 3456 LE:r5 = 6543 */
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ldrb r7, [r6, #(IP_SRC + 7)] /* r7 = ...7 */
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#ifdef __ARMEB__
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mov r4, r4, lsl #8 /* r4 = 012. */
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orr r4, r4, r5, lsr #24 /* r4 = 0123 */
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orr r5, r7, r5, lsl #8 /* r5 = 4567 */
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b .Lin4_cksum_add_ips
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nop
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#else
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mov r4, r4, lsr #8 /* r4 = .210 */
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orr r4, r4, r5, lsl #24 /* r4 = 3210 */
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mov r5, r5, lsr #8 /* r5 = .654 */
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orr r5, r5, r7, lsl #24 /* r5 = 7654 */
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b .Lin4_cksum_add_ips
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#endif
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/* 0x02: Data 16-bit aligned */
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#ifdef __XSCALE__
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ldrh r5, [r6, #(IP_SRC)] /* BE:r5 = ..01 LE:r5 = ..10 */
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ldrh r7, [r6, #(IP_DST + 2)] /* BE:r7 = ..67 LE:r7 = ..76 */
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ldr r4, [r6, #(IP_SRC + 2)] /* BE:r4 = 2345 LE:r4 = 5432 */
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orr r5, r7, r5, lsl #16 /* BE:r5 = 0167 LE:r5 = 1076 */
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b .Lin4_cksum_add_ips
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nop
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nop
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nop
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#else
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ldr r4, [r6, #(IP_SRC - 2)] /* r4 = 10xx */
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ldr r7, [r6, #(IP_DST - 2)] /* r7 = xx76 */
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ldr r5, [r6, #(IP_SRC + 2)] /* r5 = 5432 */
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mov r4, r4, lsr #16 /* r4 = ..10 */
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orr r4, r4, r7, lsl #16 /* r4 = 7610 */
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b .Lin4_cksum_add_ips
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nop
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nop
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#endif
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/* 0x03: Data 8-bit aligned */
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ldrb r4, [r6, #(IP_SRC)] /* r4 = ...0 */
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ldr r5, [r6, #(IP_SRC + 1)] /* BE:r5 = 1234 LE:r5 = 4321 */
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ldr r7, [r6, #(IP_SRC + 5)] /* BE:r7 = 567x LE:r7 = x765 */
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#ifdef __ARMEB__
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mov r4, r4, lsl #24 /* r4 = 0... */
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orr r4, r4, r5, lsr #8 /* r4 = 0123 */
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mov r5, r5, lsl #24 /* r5 = 4... */
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orr r5, r5, r7, lsr #8 /* r5 = 4567 */
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#else
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orr r4, r4, r5, lsl #8 /* r4 = 3210 */
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mov r5, r5, lsr #24 /* r4 = ...4 */
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orr r5, r5, r7, lsl #8 /* r5 = 7654 */
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#endif
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/* FALLTHROUGH */
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.Lin4_cksum_add_ips:
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adds r5, r5, r4
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#ifndef __ARMEB__
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adcs r8, r5, r8, lsl #8
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#else
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adcs r8, r5, r8
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#endif
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adc r8, r8, #0x00
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mov r1, #0x00
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b .Lin4_cksum_skip_entry
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.Lin4_cksum_skip_loop:
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ldr r1, [r0, #(M_LEN)]
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ldr r6, [r0, #(M_DATA)]
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ldr r0, [r0, #(M_NEXT)]
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.Lin4_cksum_skip_entry:
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subs r2, r2, r1
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blt .Lin4_cksum_skip_done
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cmp r0, #0x00
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bne .Lin4_cksum_skip_loop
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b .Lin4_cksum_whoops
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.Lin4_cksum_skip_done:
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mov ip, r0
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add r0, r2, r6
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add r0, r0, r1
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rsb r1, r2, #0x00
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mov r9, r3
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mov r10, #0x00
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b .Lin_cksum_entry4
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.Lin4_cksum_whoops:
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adr r0, .Lin4_cksum_whoops_str
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bl _C_LABEL(panic)
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.Lin4_cksum_whoops_str:
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.asciz "in4_cksum: out of mbufs\n"
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.align 5
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#endif /* INET */
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ENTRY(do_cksum)
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stmfd sp!, {r4-r11, lr}
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bl L_cksumdata
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mov r0, r2
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ldmfd sp!, {r4-r11, pc}
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/*
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* The main in*_cksum() workhorse...
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*
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@ -43,9 +43,19 @@
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#ifdef _KERNEL
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u_short in_cksum(struct mbuf *m, int len);
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u_int in_cksum_hdr(const struct ip *ip);
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u_short in_addword(u_short sum, u_short b);
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u_short in_pseudo(u_int sum, u_int b, u_int c);
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u_short in_cksum_skip(struct mbuf *m, int len, int skip);
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u_int do_cksum(const void *, int);
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static __inline u_int
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in_cksum_hdr(const struct ip *ip)
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{
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u_int sum = do_cksum(ip, sizeof(struct ip));
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sum = (sum & 0xffff) + (sum >> 16);
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if (sum > 0xffff)
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sum -= 0xffff;
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return (~sum & 0xffff);
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}
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#endif /* _KERNEL */
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#endif /* _MACHINE_IN_CKSUM_H_ */
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