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01fe7ab88efe1771618358ee5e90f56996ba909e
vpp/src/plugins/geneve/encap.c
Neale Ranns 3a6adc52fe geneve: Move to plugin 
Type: refactor

Change-Id: I613bf4d6517591351b212bfe6c8d93abf235f5dc
Signed-off-by: Neale Ranns <nranns@cisco.com>
2020-09-21 17:04:13 +00:00

582 lines
18 KiB
C
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/*
* Copyright (c) 2017 SUSE LLC.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <vppinfra/error.h>
#include <vppinfra/hash.h>
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/ethernet/ethernet.h>
#include <geneve/geneve.h>
/* Statistics (not all errors) */
#define foreach_geneve_encap_error \
_(ENCAPSULATED, "good packets encapsulated")
static char *geneve_encap_error_strings[] = {
#define _(sym,string) string,
foreach_geneve_encap_error
#undef _
};
typedef enum
{
#define _(sym,str) GENEVE_ENCAP_ERROR_##sym,
foreach_geneve_encap_error
#undef _
GENEVE_ENCAP_N_ERROR,
} geneve_encap_error_t;
typedef enum
{
GENEVE_ENCAP_NEXT_DROP,
GENEVE_ENCAP_N_NEXT,
} geneve_encap_next_t;
#define foreach_fixed_header4_offset \
_(0) _(1) _(2) _(3)
#define foreach_fixed_header6_offset \
_(0) _(1) _(2) _(3) _(4) _(5) _(6)
always_inline uword
geneve_encap_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame, u32 is_ip4)
{
u32 n_left_from, next_index, *from, *to_next;
geneve_main_t *vxm = &geneve_main;
vnet_main_t *vnm = vxm->vnet_main;
vnet_interface_main_t *im = &vnm->interface_main;
u32 pkts_encapsulated = 0;
u16 old_l0 = 0, old_l1 = 0;
u32 thread_index = vm->thread_index;
u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
u32 sw_if_index0 = ~0, sw_if_index1 = ~0;
u32 next0 = 0, next1 = 0;
vnet_hw_interface_t *hi0, *hi1;
geneve_tunnel_t *t0 = NULL, *t1 = NULL;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
vlib_get_buffers (vm, from, bufs, n_left_from);
next_index = node->cached_next_index;
stats_sw_if_index = node->runtime_data[0];
stats_n_packets = stats_n_bytes = 0;
while (n_left_from > 0)
{
u32 n_left_to_next;
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from >= 4 && n_left_to_next >= 2)
{
u32 bi0, bi1;
u32 flow_hash0, flow_hash1;
u32 len0, len1;
ip4_header_t *ip4_0, *ip4_1;
ip6_header_t *ip6_0, *ip6_1;
udp_header_t *udp0, *udp1;
u64 *copy_src0, *copy_dst0;
u64 *copy_src1, *copy_dst1;
u32 *copy_src_last0, *copy_dst_last0;
u32 *copy_src_last1, *copy_dst_last1;
u16 new_l0, new_l1;
ip_csum_t sum0, sum1;
/* Prefetch next iteration. */
{
vlib_prefetch_buffer_header (b[2], LOAD);
vlib_prefetch_buffer_header (b[3], LOAD);
CLIB_PREFETCH (b[2]->data - CLIB_CACHE_LINE_BYTES,
2 * CLIB_CACHE_LINE_BYTES, LOAD);
CLIB_PREFETCH (b[3]->data - CLIB_CACHE_LINE_BYTES,
2 * CLIB_CACHE_LINE_BYTES, LOAD);
}
bi0 = from[0];
bi1 = from[1];
to_next[0] = bi0;
to_next[1] = bi1;
from += 2;
to_next += 2;
n_left_to_next -= 2;
n_left_from -= 2;
flow_hash0 = vnet_l2_compute_flow_hash (b[0]);
flow_hash1 = vnet_l2_compute_flow_hash (b[1]);
/* Get next node index and adj index from tunnel next_dpo */
if (sw_if_index0 != vnet_buffer (b[0])->sw_if_index[VLIB_TX])
{
sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
t0 = &vxm->tunnels[hi0->dev_instance];
/* Note: change to always set next0 if it may be set to drop */
next0 = t0->next_dpo.dpoi_next_node;
}
ALWAYS_ASSERT (t0 != NULL);
vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = t0->next_dpo.dpoi_index;
/* Get next node index and adj index from tunnel next_dpo */
if (sw_if_index1 != vnet_buffer (b[1])->sw_if_index[VLIB_TX])
{
sw_if_index1 = vnet_buffer (b[1])->sw_if_index[VLIB_TX];
hi1 = vnet_get_sup_hw_interface (vnm, sw_if_index1);
t1 = &vxm->tunnels[hi1->dev_instance];
/* Note: change to always set next1 if it may be set to drop */
next1 = t1->next_dpo.dpoi_next_node;
}
ALWAYS_ASSERT (t1 != NULL);
vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = t1->next_dpo.dpoi_index;
/* Apply the rewrite string. $$$$ vnet_rewrite? */
vlib_buffer_advance (b[0], -(word) _vec_len (t0->rewrite));
vlib_buffer_advance (b[1], -(word) _vec_len (t1->rewrite));
if (is_ip4)
{
u8 ip4_geneve_base_header_len =
sizeof (ip4_header_t) + sizeof (udp_header_t) +
GENEVE_BASE_HEADER_LENGTH;
u8 ip4_geneve_header_total_len0 = ip4_geneve_base_header_len;
u8 ip4_geneve_header_total_len1 = ip4_geneve_base_header_len;
#if SUPPORT_OPTIONS_HEADER==1
ip4_geneve_header_total_len0 += t0->options_len;
ip4_geneve_header_total_len1 += t1->options_len;
#endif
ASSERT (vec_len (t0->rewrite) == ip4_geneve_header_total_len0);
ASSERT (vec_len (t1->rewrite) == ip4_geneve_header_total_len1);
ip4_0 = vlib_buffer_get_current (b[0]);
ip4_1 = vlib_buffer_get_current (b[1]);
/* Copy the fixed header */
copy_dst0 = (u64 *) ip4_0;
copy_src0 = (u64 *) t0->rewrite;
copy_dst1 = (u64 *) ip4_1;
copy_src1 = (u64 *) t1->rewrite;
/* Copy first 32 octets 8-bytes at a time */
#define _(offs) copy_dst0[offs] = copy_src0[offs];
foreach_fixed_header4_offset;
#undef _
#define _(offs) copy_dst1[offs] = copy_src1[offs];
foreach_fixed_header4_offset;
#undef _
/* Last 4 octets. Hopefully gcc will be our friend */
copy_dst_last0 = (u32 *) (&copy_dst0[4]);
copy_src_last0 = (u32 *) (&copy_src0[4]);
copy_dst_last0[0] = copy_src_last0[0];
copy_dst_last1 = (u32 *) (&copy_dst1[4]);
copy_src_last1 = (u32 *) (&copy_src1[4]);
copy_dst_last1[0] = copy_src_last1[0];
/* Fix the IP4 checksum and length */
sum0 = ip4_0->checksum;
new_l0 = /* old_l0 always 0, see the rewrite setup */
clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[0]));
sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
length /* changed member */ );
ip4_0->checksum = ip_csum_fold (sum0);
ip4_0->length = new_l0;
sum1 = ip4_1->checksum;
new_l1 = /* old_l1 always 0, see the rewrite setup */
clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[1]));
sum1 = ip_csum_update (sum1, old_l1, new_l1, ip4_header_t,
length /* changed member */ );
ip4_1->checksum = ip_csum_fold (sum1);
ip4_1->length = new_l1;
/* Fix UDP length and set source port */
udp0 = (udp_header_t *) (ip4_0 + 1);
new_l0 =
clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[0]) -
sizeof (*ip4_0));
udp0->length = new_l0;
udp0->src_port = flow_hash0;
udp1 = (udp_header_t *) (ip4_1 + 1);
new_l1 =
clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[1]) -
sizeof (*ip4_1));
udp1->length = new_l1;
udp1->src_port = flow_hash1;
}
else /* ipv6 */
{
int bogus = 0;
u8 ip6_geneve_base_header_len =
sizeof (ip6_header_t) + sizeof (udp_header_t) +
GENEVE_BASE_HEADER_LENGTH;
u8 ip6_geneve_header_total_len0 = ip6_geneve_base_header_len;
u8 ip6_geneve_header_total_len1 = ip6_geneve_base_header_len;
#if SUPPORT_OPTIONS_HEADER==1
ip6_geneve_header_total_len0 += t0->options_len;
ip6_geneve_header_total_len1 += t1->options_len;
#endif
ASSERT (vec_len (t0->rewrite) == ip6_geneve_header_total_len0);
ASSERT (vec_len (t1->rewrite) == ip6_geneve_header_total_len1);
ip6_0 = vlib_buffer_get_current (b[0]);
ip6_1 = vlib_buffer_get_current (b[1]);
/* Copy the fixed header */
copy_dst0 = (u64 *) ip6_0;
copy_src0 = (u64 *) t0->rewrite;
copy_dst1 = (u64 *) ip6_1;
copy_src1 = (u64 *) t1->rewrite;
/* Copy first 56 (ip6) octets 8-bytes at a time */
#define _(offs) copy_dst0[offs] = copy_src0[offs];
foreach_fixed_header6_offset;
#undef _
#define _(offs) copy_dst1[offs] = copy_src1[offs];
foreach_fixed_header6_offset;
#undef _
/* Fix IP6 payload length */
new_l0 =
clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[0])
- sizeof (*ip6_0));
ip6_0->payload_length = new_l0;
new_l1 =
clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[1])
- sizeof (*ip6_1));
ip6_1->payload_length = new_l1;
/* Fix UDP length and set source port */
udp0 = (udp_header_t *) (ip6_0 + 1);
udp0->length = new_l0;
udp0->src_port = flow_hash0;
udp1 = (udp_header_t *) (ip6_1 + 1);
udp1->length = new_l1;
udp1->src_port = flow_hash1;
/* IPv6 UDP checksum is mandatory */
udp0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b[0],
ip6_0,
&bogus);
ASSERT (bogus == 0);
if (udp0->checksum == 0)
udp0->checksum = 0xffff;
udp1->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b[1],
ip6_1,
&bogus);
ASSERT (bogus == 0);
if (udp1->checksum == 0)
udp1->checksum = 0xffff;
}
pkts_encapsulated += 2;
len0 = vlib_buffer_length_in_chain (vm, b[0]);
len1 = vlib_buffer_length_in_chain (vm, b[1]);
stats_n_packets += 2;
stats_n_bytes += len0 + len1;
/* save inner packet flow_hash for load-balance node */
vnet_buffer (b[0])->ip.flow_hash = flow_hash0;
vnet_buffer (b[1])->ip.flow_hash = flow_hash1;
/* Batch stats increment on the same geneve tunnel so counter is not
incremented per packet. Note stats are still incremented for deleted
and admin-down tunnel where packets are dropped. It is not worthwhile
to check for this rare case and affect normal path performance. */
if (PREDICT_FALSE ((sw_if_index0 != stats_sw_if_index) ||
(sw_if_index1 != stats_sw_if_index)))
{
stats_n_packets -= 2;
stats_n_bytes -= len0 + len1;
if (sw_if_index0 == sw_if_index1)
{
if (stats_n_packets)
vlib_increment_combined_counter
(im->combined_sw_if_counters +
VNET_INTERFACE_COUNTER_TX, thread_index,
stats_sw_if_index, stats_n_packets, stats_n_bytes);
stats_sw_if_index = sw_if_index0;
stats_n_packets = 2;
stats_n_bytes = len0 + len1;
}
else
{
vlib_increment_combined_counter
(im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
thread_index, sw_if_index0, 1, len0);
vlib_increment_combined_counter
(im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
thread_index, sw_if_index1, 1, len1);
}
}
if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
{
geneve_encap_trace_t *tr =
vlib_add_trace (vm, node, b[0], sizeof (*tr));
tr->tunnel_index = t0 - vxm->tunnels;
tr->vni = t0->vni;
}
if (PREDICT_FALSE (b[1]->flags & VLIB_BUFFER_IS_TRACED))
{
geneve_encap_trace_t *tr =
vlib_add_trace (vm, node, b[1], sizeof (*tr));
tr->tunnel_index = t1 - vxm->tunnels;
tr->vni = t1->vni;
}
b += 2;
vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
to_next, n_left_to_next,
bi0, bi1, next0, next1);
}
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
u32 flow_hash0;
u32 len0;
ip4_header_t *ip4_0;
ip6_header_t *ip6_0;
udp_header_t *udp0;
u64 *copy_src0, *copy_dst0;
u32 *copy_src_last0, *copy_dst_last0;
u16 new_l0;
ip_csum_t sum0;
bi0 = from[0];
to_next[0] = bi0;
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
flow_hash0 = vnet_l2_compute_flow_hash (b[0]);
/* Get next node index and adj index from tunnel next_dpo */
if (sw_if_index0 != vnet_buffer (b[0])->sw_if_index[VLIB_TX])
{
sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
t0 = &vxm->tunnels[hi0->dev_instance];
/* Note: change to always set next0 if it may be set to drop */
next0 = t0->next_dpo.dpoi_next_node;
}
ALWAYS_ASSERT (t0 != NULL);
vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = t0->next_dpo.dpoi_index;
/* Apply the rewrite string. $$$$ vnet_rewrite? */
vlib_buffer_advance (b[0], -(word) _vec_len (t0->rewrite));
if (is_ip4)
{
u8 ip4_geneve_base_header_len =
sizeof (ip4_header_t) + sizeof (udp_header_t) +
GENEVE_BASE_HEADER_LENGTH;
u8 ip4_geneve_header_total_len0 = ip4_geneve_base_header_len;
#if SUPPORT_OPTIONS_HEADER==1
ip4_geneve_header_total_len0 += t0->options_len;
#endif
ASSERT (vec_len (t0->rewrite) == ip4_geneve_header_total_len0);
ip4_0 = vlib_buffer_get_current (b[0]);
/* Copy the fixed header */
copy_dst0 = (u64 *) ip4_0;
copy_src0 = (u64 *) t0->rewrite;
/* Copy first 32 octets 8-bytes at a time */
#define _(offs) copy_dst0[offs] = copy_src0[offs];
foreach_fixed_header4_offset;
#undef _
/* Last 4 octets. Hopefully gcc will be our friend */
copy_dst_last0 = (u32 *) (&copy_dst0[4]);
copy_src_last0 = (u32 *) (&copy_src0[4]);
copy_dst_last0[0] = copy_src_last0[0];
/* Fix the IP4 checksum and length */
sum0 = ip4_0->checksum;
new_l0 = /* old_l0 always 0, see the rewrite setup */
clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[0]));
sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
length /* changed member */ );
ip4_0->checksum = ip_csum_fold (sum0);
ip4_0->length = new_l0;
/* Fix UDP length and set source port */
udp0 = (udp_header_t *) (ip4_0 + 1);
new_l0 =
clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[0]) -
sizeof (*ip4_0));
udp0->length = new_l0;
udp0->src_port = flow_hash0;
}
else /* ip6 path */
{
int bogus = 0;
u8 ip6_geneve_base_header_len =
sizeof (ip6_header_t) + sizeof (udp_header_t) +
GENEVE_BASE_HEADER_LENGTH;
u8 ip6_geneve_header_total_len0 = ip6_geneve_base_header_len;
#if SUPPORT_OPTIONS_HEADER==1
ip6_geneve_header_total_len0 += t0->options_len;
#endif
ASSERT (vec_len (t0->rewrite) == ip6_geneve_header_total_len0);
ip6_0 = vlib_buffer_get_current (b[0]);
/* Copy the fixed header */
copy_dst0 = (u64 *) ip6_0;
copy_src0 = (u64 *) t0->rewrite;
/* Copy first 56 (ip6) octets 8-bytes at a time */
#define _(offs) copy_dst0[offs] = copy_src0[offs];
foreach_fixed_header6_offset;
#undef _
/* Fix IP6 payload length */
new_l0 =
clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[0])
- sizeof (*ip6_0));
ip6_0->payload_length = new_l0;
/* Fix UDP length and set source port */
udp0 = (udp_header_t *) (ip6_0 + 1);
udp0->length = new_l0;
udp0->src_port = flow_hash0;
/* IPv6 UDP checksum is mandatory */
udp0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b[0],
ip6_0,
&bogus);
ASSERT (bogus == 0);
if (udp0->checksum == 0)
udp0->checksum = 0xffff;
}
pkts_encapsulated++;
len0 = vlib_buffer_length_in_chain (vm, b[0]);
stats_n_packets += 1;
stats_n_bytes += len0;
/* save inner packet flow_hash for load-balance node */
vnet_buffer (b[0])->ip.flow_hash = flow_hash0;
/* Batch stats increment on the same geneve tunnel so counter is not
incremented per packet. Note stats are still incremented for deleted
and admin-down tunnel where packets are dropped. It is not worthwhile
to check for this rare case and affect normal path performance. */
if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
{
stats_n_packets -= 1;
stats_n_bytes -= len0;
if (stats_n_packets)
vlib_increment_combined_counter
(im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
thread_index, stats_sw_if_index,
stats_n_packets, stats_n_bytes);
stats_n_packets = 1;
stats_n_bytes = len0;
stats_sw_if_index = sw_if_index0;
}
if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
{
geneve_encap_trace_t *tr =
vlib_add_trace (vm, node, b[0], sizeof (*tr));
tr->tunnel_index = t0 - vxm->tunnels;
tr->vni = t0->vni;
}
b += 1;
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
bi0, next0);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
/* Do we still need this now that tunnel tx stats is kept? */
vlib_node_increment_counter (vm, node->node_index,
GENEVE_ENCAP_ERROR_ENCAPSULATED,
pkts_encapsulated);
/* Increment any remaining batch stats */
if (stats_n_packets)
{
vlib_increment_combined_counter
(im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
node->runtime_data[0] = stats_sw_if_index;
}
return from_frame->n_vectors;
}
VLIB_NODE_FN (geneve4_encap_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
return geneve_encap_inline (vm, node, from_frame, /* is_ip4 */ 1);
}
VLIB_NODE_FN (geneve6_encap_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
return geneve_encap_inline (vm, node, from_frame, /* is_ip4 */ 0);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (geneve4_encap_node) = {
.name = "geneve4-encap",
.vector_size = sizeof (u32),
.format_trace = format_geneve_encap_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN (geneve_encap_error_strings),
.error_strings = geneve_encap_error_strings,
.n_next_nodes = GENEVE_ENCAP_N_NEXT,
.next_nodes = {
[GENEVE_ENCAP_NEXT_DROP] = "error-drop",
},
};
VLIB_REGISTER_NODE (geneve6_encap_node) = {
.name = "geneve6-encap",
.vector_size = sizeof (u32),
.format_trace = format_geneve_encap_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN (geneve_encap_error_strings),
.error_strings = geneve_encap_error_strings,
.n_next_nodes = GENEVE_ENCAP_N_NEXT,
.next_nodes = {
[GENEVE_ENCAP_NEXT_DROP] = "error-drop",
},
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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