/*
 * arch/alpha/lib/ev6-csum_ipv6_magic.S
 * 21264 version contributed by Rick Gorton <rick.gorton@alpha-processor.com>
 *
 * unsigned short csum_ipv6_magic(struct in6_addr *saddr,
 *                                struct in6_addr *daddr,
 *                                __u32 len,
 *                                unsigned short proto,
 *                                unsigned int csum);
 *
 * Much of the information about 21264 scheduling/coding comes from:
 *	Compiler Writer's Guide for the Alpha 21264
 *	abbreviated as 'CWG' in other comments here
 *	ftp.digital.com/pub/Digital/info/semiconductor/literature/dsc-library.html
 * Scheduling notation:
 *	E	- either cluster
 *	U	- upper subcluster; U0 - subcluster U0; U1 - subcluster U1
 *	L	- lower subcluster; L0 - subcluster L0; L1 - subcluster L1
 * Try not to change the actual algorithm if possible for consistency.
 * Determining actual stalls (other than slotting) doesn't appear to be easy to do.
 *
 * unsigned short csum_ipv6_magic(struct in6_addr *saddr,
 *                                struct in6_addr *daddr,
 *                                __u32 len,
 *                                unsigned short proto,
 *                                unsigned int csum);
 *
 * Swap <proto> (takes form 0xaabb)
 * Then shift it left by 48, so result is:
 *	0xbbaa0000 00000000
 * Then turn it back into a sign extended 32-bit item
 *	0xbbaa0000
 *
 * Swap <len> (an unsigned int) using Mike Burrows' 7-instruction sequence
 * (we can't hide the 3-cycle latency of the unpkbw in the 6-instruction sequence)
 * Assume input takes form 0xAABBCCDD
 *
 * Finally, original 'folding' approach is to split the long into 4 unsigned shorts
 * add 4 ushorts, resulting in ushort/carry
 * add carry bits + ushort --> ushort
 * add carry bits + ushort --> ushort (in case the carry results in an overflow)
 * Truncate to a ushort.  (took 13 instructions)
 * From doing some testing, using the approach in checksum.c:from64to16()
 * results in the same outcome:
 * split into 2 uints, add those, generating a ulong
 * add the 3 low ushorts together, generating a uint
 * a final add of the 2 lower ushorts
 * truncating the result.
 *
 * Misalignment handling added by Ivan Kokshaysky <ink@jurassic.park.msu.ru>
 * The cost is 16 instructions (~8 cycles), including two extra loads which
 * may cause additional delay in rare cases (load-load replay traps).
 */

	.globl csum_ipv6_magic
	.align 4
	.ent csum_ipv6_magic
	.frame $30,0,$26,0
csum_ipv6_magic:
	.prologue 0

	ldq_u	$0,0($16)	# L : Latency: 3
	inslh	$18,7,$4	# U : 0000000000AABBCC
	ldq_u	$1,8($16)	# L : Latency: 3
	sll	$19,8,$7	# U : U L U L : 0x00000000 00aabb00

	and	$16,7,$6	# E : src misalignment
	ldq_u	$5,15($16)	# L : Latency: 3
	zapnot	$20,15,$20	# U : zero extend incoming csum
	ldq_u	$2,0($17)	# L : U L U L : Latency: 3

	extql	$0,$6,$0	# U :
	extqh	$1,$6,$22	# U :
	ldq_u	$3,8($17)	# L : Latency: 3
	sll	$19,24,$19	# U : U U L U : 0x000000aa bb000000

	cmoveq	$6,$31,$22	# E : src aligned?
	ldq_u	$23,15($17)	# L : Latency: 3
	inswl	$18,3,$18	# U : 000000CCDD000000
	addl	$19,$7,$19	# E : U L U L : <sign bits>bbaabb00

	or	$0,$22,$0	# E : 1st src word complete
	extql	$1,$6,$1	# U :
	or	$18,$4,$18	# E : 000000CCDDAABBCC
	extqh	$5,$6,$5	# U : L U L U

	and	$17,7,$6	# E : dst misalignment
	extql	$2,$6,$2	# U :
	or	$1,$5,$1	# E : 2nd src word complete
	extqh	$3,$6,$22	# U : L U L U :

	cmoveq	$6,$31,$22	# E : dst aligned?
	extql	$3,$6,$3	# U :
	addq	$20,$0,$20	# E : begin summing the words
	extqh	$23,$6,$23	# U : L U L U :

	srl	$18,16,$4	# U : 0000000000CCDDAA
	or	$2,$22,$2	# E : 1st dst word complete
	zap	$19,0x3,$19	# U : <sign bits>bbaa0000
	or	$3,$23,$3	# E : U L U L : 2nd dst word complete

	cmpult	$20,$0,$0	# E :
	addq	$20,$1,$20	# E :
	zapnot	$18,0xa,$18	# U : 00000000DD00BB00
	zap	$4,0xa,$4	# U : U U L L : 0000000000CC00AA

	or	$18,$4,$18	# E : 00000000DDCCBBAA
	nop			# E :
	cmpult	$20,$1,$1	# E :
	addq	$20,$2,$20	# E : U L U L

	cmpult	$20,$2,$2	# E :
	addq	$20,$3,$20	# E :
	cmpult	$20,$3,$3	# E : (1 cycle stall on $20)
	addq	$20,$18,$20	# E : U L U L (1 cycle stall on $20)

	cmpult	$20,$18,$18	# E :
	addq	$20,$19,$20	# E : (1 cycle stall on $20)
	addq	$0,$1,$0	# E : merge the carries back into the csum
	addq	$2,$3,$2	# E :

	cmpult	$20,$19,$19	# E :
	addq	$18,$19,$18	# E : (1 cycle stall on $19)
	addq	$0,$2,$0	# E :
	addq	$20,$18,$20	# E : U L U L :
		/* (1 cycle stall on $18, 2 cycles on $20) */

	addq	$0,$20,$0	# E :
	zapnot	$0,15,$1	# U : Start folding output (1 cycle stall on $0)
	nop			# E :
	srl	$0,32,$0	# U : U L U L : (1 cycle stall on $0)

	addq	$1,$0,$1	# E : Finished generating ulong
	extwl	$1,2,$2		# U : ushort[1] (1 cycle stall on $1)
	zapnot	$1,3,$0		# U : ushort[0] (1 cycle stall on $1)
	extwl	$1,4,$1		# U : ushort[2] (1 cycle stall on $1)

	addq	$0,$2,$0	# E
	addq	$0,$1,$3	# E : Finished generating uint
		/* (1 cycle stall on $0) */
	extwl	$3,2,$1		# U : ushort[1] (1 cycle stall on $3)
	nop			# E : L U L U

	addq	$1,$3,$0	# E : Final carry
	not	$0,$4		# E : complement (1 cycle stall on $0)
	zapnot	$4,3,$0		# U : clear upper garbage bits
		/* (1 cycle stall on $4) */
	ret			# L0 : L U L U

	.end csum_ipv6_magic
27:23 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests/rcutorture/configs?id=f5a0aab84b74de68523599817569c057c7ac1622'>f5a0aab84b74de68523599817569c057c7ac1622</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/testing/selftests/rcutorture/configs?id=f5a0aab84b74de68523599817569c057c7ac1622'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=f5a0aab84b74de68523599817569c057c7ac1622'>321a7119a443d99853b4d3e747db583ad3a39912</a> /<a href='/cgit.cgi/linux/net-next.git/tree/tools/testing/selftests/rcutorture/configs?id=f5a0aab84b74de68523599817569c057c7ac1622'>tools/testing/selftests/rcutorture/configs</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests/rcutorture/configs?id=2344ef3c86a7fe41f97bf66c7936001b6132860b'>2344ef3c86a7fe41f97bf66c7936001b6132860b</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/testing/selftests/rcutorture/configs?id=f5a0aab84b74de68523599817569c057c7ac1622&amp;id2=2344ef3c86a7fe41f97bf66c7936001b6132860b'>diff</a>)</td></tr></table>
<div class='commit-subject'>net: ipv4: dst for local input routes should use l3mdev if relevant</div><div class='commit-msg'>IPv4 output routes already use l3mdev device instead of loopback for dst's
if it is applicable. Change local input routes to do the same.

This fixes icmp responses for unreachable UDP ports which are directed
to the wrong table after commit 9d1a6c4ea43e4 because local_input
routes use the loopback device. Moving from ingress device to loopback
loses the L3 domain causing responses based on the dst to get to lost.

Fixes: 9d1a6c4ea43e4 ("net: icmp_route_lookup should use rt dev to
		       determine L3 domain")
Signed-off-by: David Ahern &lt;dsa@cumulusnetworks.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=f5a0aab84b74de68523599817569c057c7ac1622'>Diffstat</a> (limited to 'tools/testing/selftests/rcutorture/configs')</div><table summary='diffstat' class='diffstat'>