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bundle: add symmetric_l3 hash method for multipath
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Add a symmetric_l3 hash method that uses both network destination
address and network source address.

VMware-BZ: #2112940
Signed-off-by: Martin Xu <[email protected]>
Signed-off-by: Ben Pfaff <[email protected]>
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@martinxu9ovs @blp
martinxu9ovs authored and blp committed Oct 2, 2018
1 parent b5967cb commit 84ddf96
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Showing 11 changed files with 520 additions and 2 deletions.
1 change: 1 addition & 0 deletions NEWS
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ Post-v2.10.0
- DPDK:
* Add option for simple round-robin based Rxq to PMD assignment.
It can be set with pmd-rxq-assign.
- Add 'symmetric_l3' hash function.

v2.10.0 - 18 Aug 2018
---------------------
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4 changes: 3 additions & 1 deletion include/openflow/nicira-ext.h
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Expand Up @@ -109,8 +109,10 @@ enum nx_hash_fields {
NX_HASH_FIELDS_NW_SRC,

/* Network destination address (NXM_OF_IP_DST) only. */
NX_HASH_FIELDS_NW_DST
NX_HASH_FIELDS_NW_DST,

/* Both network destination and source destination addresses. */
NX_HASH_FIELDS_SYMMETRIC_L3
};

/* NXT_PACKET_IN (analogous to OFPT_PACKET_IN).
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2 changes: 2 additions & 0 deletions lib/bundle.c
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Original file line number Diff line number Diff line change
Expand Up @@ -198,6 +198,8 @@ bundle_parse__(const char *s, const struct ofputil_port_map *port_map,
bundle->fields = NX_HASH_FIELDS_NW_SRC;
} else if (!strcasecmp(fields, "nw_dst")) {
bundle->fields = NX_HASH_FIELDS_NW_DST;
} else if (!strcasecmp(fields, "symmetric_l3")) {
bundle->fields = NX_HASH_FIELDS_SYMMETRIC_L3;
} else {
return xasprintf("%s: unknown fields `%s'", s, fields);
}
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47 changes: 46 additions & 1 deletion lib/flow.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2307,6 +2307,37 @@ flow_hash_symmetric_l3l4(const struct flow *flow, uint32_t basis,
return hash_finish(hash, basis);
}

/* Hashes 'flow' based on its nw_dst and nw_src for multipath. */
uint32_t
flow_hash_symmetric_l3(const struct flow *flow, uint32_t basis)
{
struct {
union {
ovs_be32 ipv4_addr;
struct in6_addr ipv6_addr;
};
ovs_be16 eth_type;
} fields;

int i;

memset(&fields, 0, sizeof fields);
fields.eth_type = flow->dl_type;

if (fields.eth_type == htons(ETH_TYPE_IP)) {
fields.ipv4_addr = flow->nw_src ^ flow->nw_dst;
} else if (fields.eth_type == htons(ETH_TYPE_IPV6)) {
const uint8_t *a = &flow->ipv6_src.s6_addr[0];
const uint8_t *b = &flow->ipv6_dst.s6_addr[0];
uint8_t *ipv6_addr = &fields.ipv6_addr.s6_addr[0];

for (i = 0; i < 16; i++) {
ipv6_addr[i] = a[i] ^ b[i];
}
}
return jhash_bytes(&fields, sizeof fields, basis);
}

/* Initialize a flow with random fields that matter for nx_hash_fields. */
void
flow_random_hash_fields(struct flow *flow)
Expand Down Expand Up @@ -2422,6 +2453,16 @@ flow_mask_hash_fields(const struct flow *flow, struct flow_wildcards *wc,
}
break;

case NX_HASH_FIELDS_SYMMETRIC_L3:
if (flow->dl_type == htons(ETH_TYPE_IP)) {
memset(&wc->masks.nw_src, 0xff, sizeof wc->masks.nw_src);
memset(&wc->masks.nw_dst, 0xff, sizeof wc->masks.nw_dst);
} else if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
memset(&wc->masks.ipv6_src, 0xff, sizeof wc->masks.ipv6_src);
memset(&wc->masks.ipv6_dst, 0xff, sizeof wc->masks.ipv6_dst);
}
break;

default:
OVS_NOT_REACHED();
}
Expand Down Expand Up @@ -2464,6 +2505,8 @@ flow_hash_fields(const struct flow *flow, enum nx_hash_fields fields,
return basis;
}

case NX_HASH_FIELDS_SYMMETRIC_L3:
return flow_hash_symmetric_l3(flow, basis);
}

OVS_NOT_REACHED();
Expand All @@ -2480,6 +2523,7 @@ flow_hash_fields_to_str(enum nx_hash_fields fields)
case NX_HASH_FIELDS_SYMMETRIC_L3L4_UDP: return "symmetric_l3l4+udp";
case NX_HASH_FIELDS_NW_SRC: return "nw_src";
case NX_HASH_FIELDS_NW_DST: return "nw_dst";
case NX_HASH_FIELDS_SYMMETRIC_L3: return "symmetric_l3";
default: return "<unknown>";
}
}
Expand All @@ -2493,7 +2537,8 @@ flow_hash_fields_valid(enum nx_hash_fields fields)
|| fields == NX_HASH_FIELDS_SYMMETRIC_L3L4
|| fields == NX_HASH_FIELDS_SYMMETRIC_L3L4_UDP
|| fields == NX_HASH_FIELDS_NW_SRC
|| fields == NX_HASH_FIELDS_NW_DST;
|| fields == NX_HASH_FIELDS_NW_DST
|| fields == NX_HASH_FIELDS_SYMMETRIC_L3;
}

/* Returns a hash value for the bits of 'flow' that are active based on
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1 change: 1 addition & 0 deletions lib/flow.h
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Original file line number Diff line number Diff line change
Expand Up @@ -241,6 +241,7 @@ uint32_t flow_hash_symmetric_l4(const struct flow *flow, uint32_t basis);
uint32_t flow_hash_symmetric_l2(const struct flow *flow, uint32_t basis);
uint32_t flow_hash_symmetric_l3l4(const struct flow *flow, uint32_t basis,
bool inc_udp_ports );
uint32_t flow_hash_symmetric_l3(const struct flow *flow, uint32_t basis);

/* Initialize a flow with random fields that matter for nx_hash_fields. */
void flow_random_hash_fields(struct flow *);
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2 changes: 2 additions & 0 deletions lib/multipath.c
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Original file line number Diff line number Diff line change
Expand Up @@ -171,6 +171,8 @@ multipath_parse__(struct ofpact_multipath *mp, const char *s_, char *s)
mp->fields = NX_HASH_FIELDS_NW_SRC;
} else if (!strcasecmp(fields, "nw_dst")) {
mp->fields = NX_HASH_FIELDS_NW_DST;
} else if (!strcasecmp(fields, "symmetric_l3")) {
mp->fields = NX_HASH_FIELDS_SYMMETRIC_L3;
} else {
return xasprintf("%s: unknown fields `%s'", s_, fields);
}
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179 changes: 179 additions & 0 deletions tests/bundle.at
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Expand Up @@ -273,3 +273,182 @@ AT_CHECK([grep Final stdout], [0],
])
OVS_VSWITCHD_STOP
AT_CLEANUP

AT_SETUP([hrw bundle symmetric_l3 link selection])
AT_KEYWORDS([bundle_action])
AT_CHECK([[ovstest test-bundle 'symmetric_l3,60,hrw,ofport,NXM_NX_REG0[],slaves:1,2,3,4,5']],
[0], [ignore])
# 100000: disruption=1.00 (perfect=1.00) 1.00 0.00 0.00 0.00 0.00 0.00
# 110000: disruption=0.50 (perfect=0.50) 0.50 0.50 0.00 0.00 0.00 0.00
# 010000: disruption=0.50 (perfect=0.50) 0.00 1.00 0.00 0.00 0.00 0.00
# 011000: disruption=0.50 (perfect=0.50) 0.00 0.50 0.50 0.00 0.00 0.00
# 111000: disruption=0.33 (perfect=0.33) 0.33 0.33 0.34 0.00 0.00 0.00
# 101000: disruption=0.33 (perfect=0.33) 0.50 0.00 0.50 0.00 0.00 0.00
# 001000: disruption=0.50 (perfect=0.50) 0.00 0.00 1.00 0.00 0.00 0.00
# 001100: disruption=0.50 (perfect=0.50) 0.00 0.00 0.50 0.50 0.00 0.00
# 101100: disruption=0.33 (perfect=0.33) 0.33 0.00 0.34 0.33 0.00 0.00
# 111100: disruption=0.25 (perfect=0.25) 0.25 0.25 0.25 0.25 0.00 0.00
# 011100: disruption=0.25 (perfect=0.25) 0.00 0.33 0.33 0.33 0.00 0.00
# 010100: disruption=0.33 (perfect=0.33) 0.00 0.50 0.00 0.50 0.00 0.00
# 110100: disruption=0.33 (perfect=0.33) 0.33 0.33 0.00 0.34 0.00 0.00
# 100100: disruption=0.33 (perfect=0.33) 0.50 0.00 0.00 0.50 0.00 0.00
# 000100: disruption=0.50 (perfect=0.50) 0.00 0.00 0.00 1.00 0.00 0.00
# 000110: disruption=0.50 (perfect=0.50) 0.00 0.00 0.00 0.50 0.50 0.00
# 100110: disruption=0.33 (perfect=0.33) 0.33 0.00 0.00 0.33 0.33 0.00
# 110110: disruption=0.25 (perfect=0.25) 0.25 0.25 0.00 0.25 0.25 0.00
# 010110: disruption=0.25 (perfect=0.25) 0.00 0.34 0.00 0.33 0.33 0.00
# 011110: disruption=0.25 (perfect=0.25) 0.00 0.25 0.25 0.25 0.25 0.00
# 111110: disruption=0.20 (perfect=0.20) 0.20 0.20 0.20 0.20 0.20 0.00
# 101110: disruption=0.20 (perfect=0.20) 0.25 0.00 0.25 0.25 0.25 0.00
# 001110: disruption=0.25 (perfect=0.25) 0.00 0.00 0.34 0.33 0.33 0.00
# 001010: disruption=0.33 (perfect=0.33) 0.00 0.00 0.50 0.00 0.50 0.00
# 101010: disruption=0.33 (perfect=0.33) 0.33 0.00 0.34 0.00 0.33 0.00
# 111010: disruption=0.25 (perfect=0.25) 0.25 0.25 0.25 0.00 0.25 0.00
# 011010: disruption=0.25 (perfect=0.25) 0.00 0.33 0.34 0.00 0.33 0.00
# 010010: disruption=0.34 (perfect=0.33) 0.00 0.50 0.00 0.00 0.50 0.00
# 110010: disruption=0.33 (perfect=0.33) 0.33 0.33 0.00 0.00 0.33 0.00
# 100010: disruption=0.33 (perfect=0.33) 0.50 0.00 0.00 0.00 0.50 0.00
# 000010: disruption=0.50 (perfect=0.50) 0.00 0.00 0.00 0.00 1.00 0.00
# 000011: disruption=0.50 (perfect=0.50) 0.00 0.00 0.00 0.00 0.50 0.50
# 100011: disruption=0.33 (perfect=0.33) 0.33 0.00 0.00 0.00 0.33 0.33
# 110011: disruption=0.25 (perfect=0.25) 0.25 0.25 0.00 0.00 0.25 0.25
# 010011: disruption=0.25 (perfect=0.25) 0.00 0.33 0.00 0.00 0.33 0.33
# 011011: disruption=0.25 (perfect=0.25) 0.00 0.25 0.25 0.00 0.25 0.25
# 111011: disruption=0.20 (perfect=0.20) 0.20 0.20 0.20 0.00 0.20 0.20
# 101011: disruption=0.20 (perfect=0.20) 0.25 0.00 0.25 0.00 0.25 0.25
# 001011: disruption=0.25 (perfect=0.25) 0.00 0.00 0.34 0.00 0.33 0.33
# 001111: disruption=0.25 (perfect=0.25) 0.00 0.00 0.25 0.25 0.25 0.25
# 101111: disruption=0.20 (perfect=0.20) 0.20 0.00 0.20 0.20 0.20 0.20
# 111111: disruption=0.17 (perfect=0.17) 0.17 0.17 0.17 0.17 0.17 0.17
# 011111: disruption=0.17 (perfect=0.17) 0.00 0.20 0.20 0.20 0.20 0.20
# 010111: disruption=0.20 (perfect=0.20) 0.00 0.25 0.00 0.25 0.25 0.25
# 110111: disruption=0.20 (perfect=0.20) 0.20 0.20 0.00 0.20 0.20 0.20
# 100111: disruption=0.20 (perfect=0.20) 0.25 0.00 0.00 0.25 0.25 0.25
# 000111: disruption=0.25 (perfect=0.25) 0.00 0.00 0.00 0.33 0.33 0.33
# 000101: disruption=0.33 (perfect=0.33) 0.00 0.00 0.00 0.50 0.00 0.50
# 100101: disruption=0.33 (perfect=0.33) 0.33 0.00 0.00 0.33 0.00 0.33
# 110101: disruption=0.25 (perfect=0.25) 0.25 0.25 0.00 0.25 0.00 0.25
# 010101: disruption=0.25 (perfect=0.25) 0.00 0.33 0.00 0.33 0.00 0.33
# 011101: disruption=0.25 (perfect=0.25) 0.00 0.25 0.25 0.25 0.00 0.25
# 111101: disruption=0.20 (perfect=0.20) 0.20 0.20 0.20 0.20 0.00 0.20
# 101101: disruption=0.20 (perfect=0.20) 0.25 0.00 0.25 0.25 0.00 0.25
# 001101: disruption=0.25 (perfect=0.25) 0.00 0.00 0.33 0.33 0.00 0.33
# 001001: disruption=0.33 (perfect=0.33) 0.00 0.00 0.50 0.00 0.00 0.50
# 101001: disruption=0.33 (perfect=0.33) 0.33 0.00 0.33 0.00 0.00 0.33
# 111001: disruption=0.25 (perfect=0.25) 0.25 0.25 0.25 0.00 0.00 0.25
# 011001: disruption=0.25 (perfect=0.25) 0.00 0.33 0.34 0.00 0.00 0.33
# 010001: disruption=0.34 (perfect=0.33) 0.00 0.50 0.00 0.00 0.00 0.50
# 110001: disruption=0.33 (perfect=0.33) 0.33 0.33 0.00 0.00 0.00 0.34
# 100001: disruption=0.33 (perfect=0.33) 0.50 0.00 0.00 0.00 0.00 0.50
# 000001: disruption=0.50 (perfect=0.50) 0.00 0.00 0.00 0.00 0.00 1.00
# 000000: disruption=1.00 (perfect=1.00) 0.00 0.00 0.00 0.00 0.00 0.00
# 100000: disruption=1.00 (perfect=1.00) 1.00 0.00 0.00 0.00 0.00 0.00
AT_CLEANUP

AT_SETUP([active_backup bundle symmetric_l3 link selection])
AT_KEYWORDS([bundle_action])
AT_CHECK([[ovstest test-bundle 'symmetric_l3,60,active_backup,ofport,NXM_NX_REG0[],slaves:1,2,3,4,5,6']],
[0],
[100000: disruption=1.00 (perfect=1.00) 1.00 0.00 0.00 0.00 0.00 0.00
110000: disruption=0.00 (perfect=0.00) 1.00 0.00 0.00 0.00 0.00 0.00
010000: disruption=1.00 (perfect=1.00) 0.00 1.00 0.00 0.00 0.00 0.00
011000: disruption=0.00 (perfect=0.00) 0.00 1.00 0.00 0.00 0.00 0.00
111000: disruption=1.00 (perfect=1.00) 1.00 0.00 0.00 0.00 0.00 0.00
101000: disruption=0.00 (perfect=0.00) 1.00 0.00 0.00 0.00 0.00 0.00
001000: disruption=1.00 (perfect=1.00) 0.00 0.00 1.00 0.00 0.00 0.00
001100: disruption=0.00 (perfect=0.00) 0.00 0.00 1.00 0.00 0.00 0.00
101100: disruption=1.00 (perfect=1.00) 1.00 0.00 0.00 0.00 0.00 0.00
111100: disruption=0.00 (perfect=0.00) 1.00 0.00 0.00 0.00 0.00 0.00
011100: disruption=1.00 (perfect=1.00) 0.00 1.00 0.00 0.00 0.00 0.00
010100: disruption=0.00 (perfect=0.00) 0.00 1.00 0.00 0.00 0.00 0.00
110100: disruption=1.00 (perfect=1.00) 1.00 0.00 0.00 0.00 0.00 0.00
100100: disruption=0.00 (perfect=0.00) 1.00 0.00 0.00 0.00 0.00 0.00
000100: disruption=1.00 (perfect=1.00) 0.00 0.00 0.00 1.00 0.00 0.00
000110: disruption=0.00 (perfect=0.00) 0.00 0.00 0.00 1.00 0.00 0.00
100110: disruption=1.00 (perfect=1.00) 1.00 0.00 0.00 0.00 0.00 0.00
110110: disruption=0.00 (perfect=0.00) 1.00 0.00 0.00 0.00 0.00 0.00
010110: disruption=1.00 (perfect=1.00) 0.00 1.00 0.00 0.00 0.00 0.00
011110: disruption=0.00 (perfect=0.00) 0.00 1.00 0.00 0.00 0.00 0.00
111110: disruption=1.00 (perfect=1.00) 1.00 0.00 0.00 0.00 0.00 0.00
101110: disruption=0.00 (perfect=0.00) 1.00 0.00 0.00 0.00 0.00 0.00
001110: disruption=1.00 (perfect=1.00) 0.00 0.00 1.00 0.00 0.00 0.00
001010: disruption=0.00 (perfect=0.00) 0.00 0.00 1.00 0.00 0.00 0.00
101010: disruption=1.00 (perfect=1.00) 1.00 0.00 0.00 0.00 0.00 0.00
111010: disruption=0.00 (perfect=0.00) 1.00 0.00 0.00 0.00 0.00 0.00
011010: disruption=1.00 (perfect=1.00) 0.00 1.00 0.00 0.00 0.00 0.00
010010: disruption=0.00 (perfect=0.00) 0.00 1.00 0.00 0.00 0.00 0.00
110010: disruption=1.00 (perfect=1.00) 1.00 0.00 0.00 0.00 0.00 0.00
100010: disruption=0.00 (perfect=0.00) 1.00 0.00 0.00 0.00 0.00 0.00
000010: disruption=1.00 (perfect=1.00) 0.00 0.00 0.00 0.00 1.00 0.00
000011: disruption=0.00 (perfect=0.00) 0.00 0.00 0.00 0.00 1.00 0.00
100011: disruption=1.00 (perfect=1.00) 1.00 0.00 0.00 0.00 0.00 0.00
110011: disruption=0.00 (perfect=0.00) 1.00 0.00 0.00 0.00 0.00 0.00
010011: disruption=1.00 (perfect=1.00) 0.00 1.00 0.00 0.00 0.00 0.00
011011: disruption=0.00 (perfect=0.00) 0.00 1.00 0.00 0.00 0.00 0.00
111011: disruption=1.00 (perfect=1.00) 1.00 0.00 0.00 0.00 0.00 0.00
101011: disruption=0.00 (perfect=0.00) 1.00 0.00 0.00 0.00 0.00 0.00
001011: disruption=1.00 (perfect=1.00) 0.00 0.00 1.00 0.00 0.00 0.00
001111: disruption=0.00 (perfect=0.00) 0.00 0.00 1.00 0.00 0.00 0.00
101111: disruption=1.00 (perfect=1.00) 1.00 0.00 0.00 0.00 0.00 0.00
111111: disruption=0.00 (perfect=0.00) 1.00 0.00 0.00 0.00 0.00 0.00
011111: disruption=1.00 (perfect=1.00) 0.00 1.00 0.00 0.00 0.00 0.00
010111: disruption=0.00 (perfect=0.00) 0.00 1.00 0.00 0.00 0.00 0.00
110111: disruption=1.00 (perfect=1.00) 1.00 0.00 0.00 0.00 0.00 0.00
100111: disruption=0.00 (perfect=0.00) 1.00 0.00 0.00 0.00 0.00 0.00
000111: disruption=1.00 (perfect=1.00) 0.00 0.00 0.00 1.00 0.00 0.00
000101: disruption=0.00 (perfect=0.00) 0.00 0.00 0.00 1.00 0.00 0.00
100101: disruption=1.00 (perfect=1.00) 1.00 0.00 0.00 0.00 0.00 0.00
110101: disruption=0.00 (perfect=0.00) 1.00 0.00 0.00 0.00 0.00 0.00
010101: disruption=1.00 (perfect=1.00) 0.00 1.00 0.00 0.00 0.00 0.00
011101: disruption=0.00 (perfect=0.00) 0.00 1.00 0.00 0.00 0.00 0.00
111101: disruption=1.00 (perfect=1.00) 1.00 0.00 0.00 0.00 0.00 0.00
101101: disruption=0.00 (perfect=0.00) 1.00 0.00 0.00 0.00 0.00 0.00
001101: disruption=1.00 (perfect=1.00) 0.00 0.00 1.00 0.00 0.00 0.00
001001: disruption=0.00 (perfect=0.00) 0.00 0.00 1.00 0.00 0.00 0.00
101001: disruption=1.00 (perfect=1.00) 1.00 0.00 0.00 0.00 0.00 0.00
111001: disruption=0.00 (perfect=0.00) 1.00 0.00 0.00 0.00 0.00 0.00
011001: disruption=1.00 (perfect=1.00) 0.00 1.00 0.00 0.00 0.00 0.00
010001: disruption=0.00 (perfect=0.00) 0.00 1.00 0.00 0.00 0.00 0.00
110001: disruption=1.00 (perfect=1.00) 1.00 0.00 0.00 0.00 0.00 0.00
100001: disruption=0.00 (perfect=0.00) 1.00 0.00 0.00 0.00 0.00 0.00
000001: disruption=1.00 (perfect=1.00) 0.00 0.00 0.00 0.00 0.00 1.00
000000: disruption=1.00 (perfect=1.00) 0.00 0.00 0.00 0.00 0.00 0.00
100000: disruption=1.00 (perfect=1.00) 1.00 0.00 0.00 0.00 0.00 0.00
])
AT_CLEANUP

AT_SETUP([hrw bundle symmetric_l3 single link selection])
AT_KEYWORDS([bundle_action])
AT_CHECK([[ovstest test-bundle 'symmetric_l3,60,hrw,ofport,NXM_NX_REG0[],slaves:1']],
[0], [ignore])
# 1: disruption=1.00 (perfect=1.00) 1.00
# 0: disruption=1.00 (perfect=1.00) 0.00
# 1: disruption=1.00 (perfect=1.00) 1.00
AT_CLEANUP

AT_SETUP([hrw bundle symmetric_l3 single link selection])
AT_KEYWORDS([bundle_action])
AT_CHECK([[ovstest test-bundle 'symmetric_l3,60,hrw,ofport,NXM_NX_REG0[],slaves:1']],
[0], [ignore])
# 1: disruption=1.00 (perfect=1.00) 1.00
# 0: disruption=1.00 (perfect=1.00) 0.00
# 1: disruption=1.00 (perfect=1.00) 1.00
AT_CLEANUP

AT_SETUP([hrw bundle symmetric_l3 no link selection])
AT_KEYWORDS([bundle_action])
AT_CHECK([[ovstest test-bundle 'symmetric_l3,60,hrw,ofport,NXM_NX_REG0[],slaves:']],
[0], [ignore])
AT_CLEANUP
#: disruption=0.00 (perfect=0.00)
#: disruption=0.00 (perfect=0.00)

AT_SETUP([bundle symmetric_l3 action with many ports])
AT_KEYWORDS([bundle_action])
OVS_VSWITCHD_START
AT_CHECK([ovs-ofctl add-flow br0 'actions=set_field:0x1->metadata,set_field:0x2->metadata,set_field:0x3->metadata,set_field:0x4->metadata,bundle(symmetric_l3,0,hrw,ofport,slaves:[[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40]])'])
AT_CHECK([ovs-ofctl dump-flows br0 --no-stats], [0], [dnl
actions=load:0x1->OXM_OF_METADATA[[]],load:0x2->OXM_OF_METADATA[[]],load:0x3->OXM_OF_METADATA[[]],load:0x4->OXM_OF_METADATA[[]],bundle(symmetric_l3,0,hrw,ofport,slaves:1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40)
])
OVS_VSWITCHD_STOP
AT_CLEANUP
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