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gerrit.nordix.org / fdio / vpp / 9ad8a2621baaf2ea1bf007ca29359a4b2838f076 / . / src / vnet / gso / node.c
blob: b57830f1ac53030263ab4be395e69c1b4603755d [file] [log] [blame]
/*
* Copyright (c) 2018 Cisco and/or its affiliates.
* 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 <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vppinfra/error.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/feature/feature.h>
#include <vnet/gso/gso.h>
#include <vnet/gso/hdr_offset_parser.h>
#include <vnet/ip/icmp46_packet.h>
#include <vnet/ip/ip4.h>
#include <vnet/ip/ip6.h>
#include <vnet/udp/udp_packet.h>
typedef struct
{
u32 flags;
u16 gso_size;
u8 gso_l4_hdr_sz;
generic_header_offset_t gho;
} gso_trace_t;
static u8 *
format_gso_trace (u8 * s, va_list * args)
{
CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
gso_trace_t *t = va_arg (*args, gso_trace_t *);
if (t->flags & VNET_BUFFER_F_GSO)
{
s = format (s, "gso_sz %d gso_l4_hdr_sz %d %U",
t->gso_size, t->gso_l4_hdr_sz, format_generic_header_offset,
&t->gho);
}
else
{
s =
format (s, "non-gso buffer %U", format_generic_header_offset,
&t->gho);
}
return s;
}
static_always_inline u16
tso_segment_ipip_tunnel_fixup (vlib_main_t * vm,
vnet_interface_per_thread_data_t * ptd,
vlib_buffer_t * sb0,
generic_header_offset_t * gho)
{
u16 n_tx_bufs = vec_len (ptd->split_buffers);
u16 i = 0, n_tx_bytes = 0;
while (i < n_tx_bufs)
{
vlib_buffer_t *b0 = vlib_get_buffer (vm, ptd->split_buffers[i]);
vnet_get_outer_header (b0, gho);
clib_memcpy_fast (vlib_buffer_get_current (b0),
vlib_buffer_get_current (sb0), gho->outer_hdr_sz);
ip4_header_t *ip4 =
(ip4_header_t *) (vlib_buffer_get_current (b0) +
gho->outer_l3_hdr_offset);
ip6_header_t *ip6 =
(ip6_header_t *) (vlib_buffer_get_current (b0) +
gho->outer_l3_hdr_offset);
if (gho->gho_flags & GHO_F_OUTER_IP4)
{
ip4->length =
clib_host_to_net_u16 (b0->current_length -
gho->outer_l3_hdr_offset);
ip4->checksum = ip4_header_checksum (ip4);
}
else if (gho->gho_flags & GHO_F_OUTER_IP6)
{
ip6->payload_length =
clib_host_to_net_u16 (b0->current_length -
gho->outer_l4_hdr_offset);
}
n_tx_bytes += gho->outer_hdr_sz;
i++;
}
return n_tx_bytes;
}
static_always_inline void
tso_segment_vxlan_tunnel_headers_fixup (vlib_main_t * vm, vlib_buffer_t * b,
generic_header_offset_t * gho)
{
u8 proto = 0;
ip4_header_t *ip4 = 0;
ip6_header_t *ip6 = 0;
udp_header_t *udp = 0;
ip4 =
(ip4_header_t *) (vlib_buffer_get_current (b) + gho->outer_l3_hdr_offset);
ip6 =
(ip6_header_t *) (vlib_buffer_get_current (b) + gho->outer_l3_hdr_offset);
udp =
(udp_header_t *) (vlib_buffer_get_current (b) + gho->outer_l4_hdr_offset);
if (gho->gho_flags & GHO_F_OUTER_IP4)
{
proto = ip4->protocol;
ip4->length =
clib_host_to_net_u16 (b->current_length - gho->outer_l3_hdr_offset);
ip4->checksum = ip4_header_checksum (ip4);
}
else if (gho->gho_flags & GHO_F_OUTER_IP6)
{
proto = ip6->protocol;
ip6->payload_length =
clib_host_to_net_u16 (b->current_length - gho->outer_l4_hdr_offset);
}
if (proto == IP_PROTOCOL_UDP)
{
int bogus;
udp->length =
clib_host_to_net_u16 (b->current_length - gho->outer_l4_hdr_offset);
udp->checksum = 0;
if (gho->gho_flags & GHO_F_OUTER_IP6)
{
udp->checksum =
ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6, &bogus);
}
else if (gho->gho_flags & GHO_F_OUTER_IP4)
{
udp->checksum = ip4_tcp_udp_compute_checksum (vm, b, ip4);
}
b->flags &= ~VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
}
}
static_always_inline u16
tso_segment_vxlan_tunnel_fixup (vlib_main_t * vm,
vnet_interface_per_thread_data_t * ptd,
vlib_buffer_t * sb0,
generic_header_offset_t * gho)
{
u16 n_tx_bufs = vec_len (ptd->split_buffers);
u16 i = 0, n_tx_bytes = 0;
while (i < n_tx_bufs)
{
vlib_buffer_t *b0 = vlib_get_buffer (vm, ptd->split_buffers[i]);
vnet_get_outer_header (b0, gho);
clib_memcpy_fast (vlib_buffer_get_current (b0),
vlib_buffer_get_current (sb0), gho->outer_hdr_sz);
tso_segment_vxlan_tunnel_headers_fixup (vm, b0, gho);
n_tx_bytes += gho->outer_hdr_sz;
i++;
}
return n_tx_bytes;
}
static_always_inline u16
tso_alloc_tx_bufs (vlib_main_t * vm,
vnet_interface_per_thread_data_t * ptd,
vlib_buffer_t * b0, u32 n_bytes_b0, u16 l234_sz,
u16 gso_size, u16 first_data_size,
generic_header_offset_t * gho)
{
u16 n_alloc, size;
u16 first_packet_length = l234_sz + first_data_size;
/*
* size is the amount of data per segmented buffer except the 1st
* segmented buffer.
* l2_hdr_offset is an offset == current_data of vlib_buffer_t.
* l234_sz is hdr_sz from l2_hdr_offset.
*/
size =
clib_min (gso_size, vlib_buffer_get_default_data_size (vm) - l234_sz
- gho->l2_hdr_offset);
/*
* First segmented buffer length is calculated separately.
* As it may contain less data than gso_size (when gso_size is
* greater than current_length of 1st buffer from GSO chained
* buffers) and/or size calculated above.
*/
u16 n_bufs = 1;
/*
* Total packet length minus first packet length including l234 header.
* rounded-up division
*/
ASSERT (n_bytes_b0 > first_packet_length);
n_bufs += ((n_bytes_b0 - first_packet_length + (size - 1)) / size);
vec_validate (ptd->split_buffers, n_bufs - 1);
n_alloc = vlib_buffer_alloc (vm, ptd->split_buffers, n_bufs);
if (n_alloc < n_bufs)
{
vlib_buffer_free (vm, ptd->split_buffers, n_alloc);
return 0;
}
return n_alloc;
}
static_always_inline void
tso_init_buf_from_template_base (vlib_buffer_t * nb0, vlib_buffer_t * b0,
u32 flags, u16 length)
{
/* copying objects from cacheline 0 */
nb0->current_data = b0->current_data;
nb0->current_length = length;
nb0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID | flags;
nb0->flow_id = b0->flow_id;
nb0->error = b0->error;
nb0->current_config_index = b0->current_config_index;
clib_memcpy_fast (&nb0->opaque, &b0->opaque, sizeof (nb0->opaque));
/* copying objects from cacheline 1 */
nb0->trace_handle = b0->trace_handle;
nb0->total_length_not_including_first_buffer = 0;
/* copying data */
clib_memcpy_fast (vlib_buffer_get_current (nb0),
vlib_buffer_get_current (b0), length);
}
static_always_inline void
tso_init_buf_from_template (vlib_main_t * vm, vlib_buffer_t * nb0,
vlib_buffer_t * b0, u16 template_data_sz,
u16 gso_size, u8 ** p_dst_ptr, u16 * p_dst_left,
u32 next_tcp_seq, u32 flags,
generic_header_offset_t * gho)
{
tso_init_buf_from_template_base (nb0, b0, flags, template_data_sz);
*p_dst_left =
clib_min (gso_size,
vlib_buffer_get_default_data_size (vm) - (template_data_sz +
nb0->current_data));
*p_dst_ptr = vlib_buffer_get_current (nb0) + template_data_sz;
tcp_header_t *tcp =
(tcp_header_t *) (vlib_buffer_get_current (nb0) + gho->l4_hdr_offset);
tcp->seq_number = clib_host_to_net_u32 (next_tcp_seq);
}
static_always_inline void
tso_fixup_segmented_buf (vlib_main_t * vm, vlib_buffer_t * b0, u8 tcp_flags,
int is_ip6, generic_header_offset_t * gho)
{
ip4_header_t *ip4 =
(ip4_header_t *) (vlib_buffer_get_current (b0) + gho->l3_hdr_offset);
ip6_header_t *ip6 =
(ip6_header_t *) (vlib_buffer_get_current (b0) + gho->l3_hdr_offset);
tcp_header_t *tcp =
(tcp_header_t *) (vlib_buffer_get_current (b0) + gho->l4_hdr_offset);
tcp->flags = tcp_flags;
if (is_ip6)
{
ip6->payload_length =
clib_host_to_net_u16 (b0->current_length - gho->l4_hdr_offset);
if (gho->gho_flags & GHO_F_TCP)
{
int bogus = 0;
tcp->checksum = 0;
tcp->checksum =
ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip6, &bogus);
b0->flags &= ~VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
}
}
else
{
ip4->length =
clib_host_to_net_u16 (b0->current_length - gho->l3_hdr_offset);
if (gho->gho_flags & GHO_F_IP4)
ip4->checksum = ip4_header_checksum (ip4);
if (gho->gho_flags & GHO_F_TCP)
{
tcp->checksum = 0;
tcp->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ip4);
}
b0->flags &= ~VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
b0->flags &= ~VNET_BUFFER_F_OFFLOAD_IP_CKSUM;
}
if ((gho->gho_flags & GHO_F_TUNNEL) == 0)
{
u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
ip_adjacency_t *adj0 = adj_get (adj_index0);
if (adj0->lookup_next_index == IP_LOOKUP_NEXT_MIDCHAIN &&
adj0->sub_type.midchain.fixup_func)
/* calls e.g. ipip44_fixup */
adj0->sub_type.midchain.fixup_func
(vm, adj0, b0, adj0->sub_type.midchain.fixup_data);
}
}
/**
* Allocate the necessary number of ptd->split_buffers,
* and segment the possibly chained buffer(s) from b0 into
* there.
*
* Return the cumulative number of bytes sent or zero
* if allocation failed.
*/
static_always_inline u32
tso_segment_buffer (vlib_main_t * vm, vnet_interface_per_thread_data_t * ptd,
u32 sbi0, vlib_buffer_t * sb0,
generic_header_offset_t * gho, u32 n_bytes_b0, int is_ip6)
{
u32 n_tx_bytes = 0;
u16 gso_size = vnet_buffer2 (sb0)->gso_size;
u8 save_tcp_flags = 0;
u8 tcp_flags_no_fin_psh = 0;
u32 next_tcp_seq = 0;
tcp_header_t *tcp =
(tcp_header_t *) (vlib_buffer_get_current (sb0) + gho->l4_hdr_offset);
next_tcp_seq = clib_net_to_host_u32 (tcp->seq_number);
/* store original flags for last packet and reset FIN and PSH */
save_tcp_flags = tcp->flags;
tcp_flags_no_fin_psh = tcp->flags & ~(TCP_FLAG_FIN | TCP_FLAG_PSH);
tcp->checksum = 0;
u32 default_bflags =
sb0->flags & ~(VNET_BUFFER_F_GSO | VLIB_BUFFER_NEXT_PRESENT);
u16 l234_sz = gho->hdr_sz;
int first_data_size = clib_min (gso_size, sb0->current_length - l234_sz);
next_tcp_seq += first_data_size;
if (PREDICT_FALSE
(!tso_alloc_tx_bufs
(vm, ptd, sb0, n_bytes_b0, l234_sz, gso_size, first_data_size, gho)))
return 0;
vlib_buffer_t *b0 = vlib_get_buffer (vm, ptd->split_buffers[0]);
tso_init_buf_from_template_base (b0, sb0, default_bflags,
l234_sz + first_data_size);
u32 total_src_left = n_bytes_b0 - l234_sz - first_data_size;
if (total_src_left)
{
/* Need to copy more segments */
u8 *src_ptr, *dst_ptr;
u16 src_left, dst_left;
/* current source buffer */
vlib_buffer_t *csb0 = sb0;
u32 csbi0 = sbi0;
/* current dest buffer */
vlib_buffer_t *cdb0;
u16 dbi = 1; /* the buffer [0] is b0 */
src_ptr = vlib_buffer_get_current (sb0) + l234_sz + first_data_size;
src_left = sb0->current_length - l234_sz - first_data_size;
tso_fixup_segmented_buf (vm, b0, tcp_flags_no_fin_psh, is_ip6, gho);
/* grab a second buffer and prepare the loop */
ASSERT (dbi < vec_len (ptd->split_buffers));
cdb0 = vlib_get_buffer (vm, ptd->split_buffers[dbi++]);
tso_init_buf_from_template (vm, cdb0, b0, l234_sz, gso_size, &dst_ptr,
&dst_left, next_tcp_seq, default_bflags,
gho);
/* an arbitrary large number to catch the runaway loops */
int nloops = 2000;
while (total_src_left)
{
if (nloops-- <= 0)
clib_panic ("infinite loop detected");
u16 bytes_to_copy = clib_min (src_left, dst_left);
clib_memcpy_fast (dst_ptr, src_ptr, bytes_to_copy);
src_left -= bytes_to_copy;
src_ptr += bytes_to_copy;
total_src_left -= bytes_to_copy;
dst_left -= bytes_to_copy;
dst_ptr += bytes_to_copy;
next_tcp_seq += bytes_to_copy;
cdb0->current_length += bytes_to_copy;
if (0 == src_left)
{
int has_next = (csb0->flags & VLIB_BUFFER_NEXT_PRESENT);
u32 next_bi = csb0->next_buffer;
/* init src to the next buffer in chain */
if (has_next)
{
csbi0 = next_bi;
csb0 = vlib_get_buffer (vm, csbi0);
src_left = csb0->current_length;
src_ptr = vlib_buffer_get_current (csb0);
}
else
{
ASSERT (total_src_left == 0);
break;
}
}
if (0 == dst_left && total_src_left)
{
n_tx_bytes += cdb0->current_length;
tso_fixup_segmented_buf (vm, cdb0, tcp_flags_no_fin_psh, is_ip6,
gho);
ASSERT (dbi < vec_len (ptd->split_buffers));
cdb0 = vlib_get_buffer (vm, ptd->split_buffers[dbi++]);
tso_init_buf_from_template (vm, cdb0, b0, l234_sz,
gso_size, &dst_ptr, &dst_left,
next_tcp_seq, default_bflags, gho);
}
}
tso_fixup_segmented_buf (vm, cdb0, save_tcp_flags, is_ip6, gho);
n_tx_bytes += cdb0->current_length;
}
n_tx_bytes += b0->current_length;
return n_tx_bytes;
}
static_always_inline void
drop_one_buffer_and_count (vlib_main_t * vm, vnet_main_t * vnm,
vlib_node_runtime_t * node, u32 * pbi0,
u32 sw_if_index, u32 drop_error_code)
{
u32 thread_index = vm->thread_index;
vlib_simple_counter_main_t *cm;
cm =
vec_elt_at_index (vnm->interface_main.sw_if_counters,
VNET_INTERFACE_COUNTER_TX_ERROR);
vlib_increment_simple_counter (cm, thread_index, sw_if_index, 1);
vlib_error_drop_buffers (vm, node, pbi0,
/* buffer stride */ 1,
/* n_buffers */ 1,
VNET_INTERFACE_OUTPUT_NEXT_DROP,
node->node_index, drop_error_code);
}
static_always_inline uword
vnet_gso_node_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame,
vnet_main_t * vnm,
vnet_hw_interface_t * hi,
int is_l2, int is_ip4, int is_ip6, int do_segmentation)
{
u32 *to_next;
u32 next_index = node->cached_next_index;
u32 *from = vlib_frame_vector_args (frame);
u32 n_left_from = frame->n_vectors;
u32 *from_end = from + n_left_from;
u32 thread_index = vm->thread_index;
vnet_interface_main_t *im = &vnm->interface_main;
vnet_interface_per_thread_data_t *ptd =
vec_elt_at_index (im->per_thread_data, thread_index);
vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
vlib_get_buffers (vm, from, b, n_left_from);
while (n_left_from > 0)
{
u32 n_left_to_next;
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
if (!do_segmentation)
while (from + 8 <= from_end && n_left_to_next >= 4)
{
u32 bi0, bi1, bi2, bi3;
u32 next0, next1, next2, next3;
u32 swif0, swif1, swif2, swif3;
gso_trace_t *t0, *t1, *t2, *t3;
vnet_hw_interface_t *hi0, *hi1, *hi2, *hi3;
/* Prefetch next iteration. */
vlib_prefetch_buffer_header (b[4], LOAD);
vlib_prefetch_buffer_header (b[5], LOAD);
vlib_prefetch_buffer_header (b[6], LOAD);
vlib_prefetch_buffer_header (b[7], LOAD);
bi0 = from[0];
bi1 = from[1];
bi2 = from[2];
bi3 = from[3];
to_next[0] = bi0;
to_next[1] = bi1;
to_next[2] = bi2;
to_next[3] = bi3;
swif0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
swif1 = vnet_buffer (b[1])->sw_if_index[VLIB_TX];
swif2 = vnet_buffer (b[2])->sw_if_index[VLIB_TX];
swif3 = vnet_buffer (b[3])->sw_if_index[VLIB_TX];
if (PREDICT_FALSE (hi->sw_if_index != swif0))
{
hi0 = vnet_get_sup_hw_interface (vnm, swif0);
if ((hi0->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0 &&
(b[0]->flags & VNET_BUFFER_F_GSO))
break;
}
if (PREDICT_FALSE (hi->sw_if_index != swif1))
{
hi1 = vnet_get_sup_hw_interface (vnm, swif1);
if (!(hi1->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) &&
(b[1]->flags & VNET_BUFFER_F_GSO))
break;
}
if (PREDICT_FALSE (hi->sw_if_index != swif2))
{
hi2 = vnet_get_sup_hw_interface (vnm, swif2);
if ((hi2->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0 &&
(b[2]->flags & VNET_BUFFER_F_GSO))
break;
}
if (PREDICT_FALSE (hi->sw_if_index != swif3))
{
hi3 = vnet_get_sup_hw_interface (vnm, swif3);
if (!(hi3->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) &&
(b[3]->flags & VNET_BUFFER_F_GSO))
break;
}
if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
{
t0 = vlib_add_trace (vm, node, b[0], sizeof (t0[0]));
t0->flags = b[0]->flags & VNET_BUFFER_F_GSO;
t0->gso_size = vnet_buffer2 (b[0])->gso_size;
t0->gso_l4_hdr_sz = vnet_buffer2 (b[0])->gso_l4_hdr_sz;
vnet_generic_header_offset_parser (b[0], &t0->gho, is_l2,
is_ip4, is_ip6);
}
if (b[1]->flags & VLIB_BUFFER_IS_TRACED)
{
t1 = vlib_add_trace (vm, node, b[1], sizeof (t1[0]));
t1->flags = b[1]->flags & VNET_BUFFER_F_GSO;
t1->gso_size = vnet_buffer2 (b[1])->gso_size;
t1->gso_l4_hdr_sz = vnet_buffer2 (b[1])->gso_l4_hdr_sz;
vnet_generic_header_offset_parser (b[1], &t1->gho, is_l2,
is_ip4, is_ip6);
}
if (b[2]->flags & VLIB_BUFFER_IS_TRACED)
{
t2 = vlib_add_trace (vm, node, b[2], sizeof (t2[0]));
t2->flags = b[2]->flags & VNET_BUFFER_F_GSO;
t2->gso_size = vnet_buffer2 (b[2])->gso_size;
t2->gso_l4_hdr_sz = vnet_buffer2 (b[2])->gso_l4_hdr_sz;
vnet_generic_header_offset_parser (b[2], &t2->gho, is_l2,
is_ip4, is_ip6);
}
if (b[3]->flags & VLIB_BUFFER_IS_TRACED)
{
t3 = vlib_add_trace (vm, node, b[3], sizeof (t3[0]));
t3->flags = b[3]->flags & VNET_BUFFER_F_GSO;
t3->gso_size = vnet_buffer2 (b[3])->gso_size;
t3->gso_l4_hdr_sz = vnet_buffer2 (b[3])->gso_l4_hdr_sz;
vnet_generic_header_offset_parser (b[3], &t3->gho, is_l2,
is_ip4, is_ip6);
}
from += 4;
to_next += 4;
n_left_to_next -= 4;
n_left_from -= 4;
next0 = next1 = 0;
next2 = next3 = 0;
vnet_feature_next (&next0, b[0]);
vnet_feature_next (&next1, b[1]);
vnet_feature_next (&next2, b[2]);
vnet_feature_next (&next3, b[3]);
vlib_validate_buffer_enqueue_x4 (vm, node, next_index, to_next,
n_left_to_next, bi0, bi1, bi2,
bi3, next0, next1, next2, next3);
b += 4;
}
while (from + 1 <= from_end && n_left_to_next > 0)
{
u32 bi0, swif0;
gso_trace_t *t0;
vnet_hw_interface_t *hi0;
u32 next0 = 0;
u32 do_segmentation0 = 0;
swif0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
if (PREDICT_FALSE (hi->sw_if_index != swif0))
{
hi0 = vnet_get_sup_hw_interface (vnm, swif0);
if ((hi0->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0 &&
(b[0]->flags & VNET_BUFFER_F_GSO))
do_segmentation0 = 1;
}
else
do_segmentation0 = do_segmentation;
/* speculatively enqueue b0 to the current next frame */
to_next[0] = bi0 = from[0];
to_next += 1;
n_left_to_next -= 1;
from += 1;
n_left_from -= 1;
if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
{
t0 = vlib_add_trace (vm, node, b[0], sizeof (t0[0]));
t0->flags = b[0]->flags & VNET_BUFFER_F_GSO;
t0->gso_size = vnet_buffer2 (b[0])->gso_size;
t0->gso_l4_hdr_sz = vnet_buffer2 (b[0])->gso_l4_hdr_sz;
vnet_generic_header_offset_parser (b[0], &t0->gho, is_l2,
is_ip4, is_ip6);
}
if (do_segmentation0)
{
if (PREDICT_FALSE (b[0]->flags & VNET_BUFFER_F_GSO))
{
/*
* Undo the enqueue of the b0 - it is not going anywhere,
* and will be freed either after it's segmented or
* when dropped, if there is no buffers to segment into.
*/
to_next -= 1;
n_left_to_next += 1;
/* undo the counting. */
generic_header_offset_t gho = { 0 };
u32 n_bytes_b0 = vlib_buffer_length_in_chain (vm, b[0]);
u32 n_tx_bytes = 0;
vnet_generic_header_offset_parser (b[0], &gho, is_l2,
is_ip4, is_ip6);
if (PREDICT_FALSE (gho.gho_flags & GHO_F_TUNNEL))
{
if (PREDICT_FALSE
(gho.gho_flags & (GHO_F_GRE_TUNNEL |
GHO_F_GENEVE_TUNNEL)))
{
/* not supported yet */
drop_one_buffer_and_count (vm, vnm, node, from - 1,
hi->sw_if_index,
VNET_INTERFACE_OUTPUT_ERROR_UNHANDLED_GSO_TYPE);
b += 1;
continue;
}
vnet_get_inner_header (b[0], &gho);
n_bytes_b0 -= gho.outer_hdr_sz;
is_ip6 = (gho.gho_flags & GHO_F_IP6) != 0;
}
n_tx_bytes =
tso_segment_buffer (vm, ptd, bi0, b[0], &gho, n_bytes_b0,
is_ip6);
if (PREDICT_FALSE (n_tx_bytes == 0))
{
drop_one_buffer_and_count (vm, vnm, node, from - 1,
hi->sw_if_index,
VNET_INTERFACE_OUTPUT_ERROR_NO_BUFFERS_FOR_GSO);
b += 1;
continue;
}
if (PREDICT_FALSE (gho.gho_flags & GHO_F_VXLAN_TUNNEL))
{
vnet_get_outer_header (b[0], &gho);
n_tx_bytes +=
tso_segment_vxlan_tunnel_fixup (vm, ptd, b[0], &gho);
}
else
if (PREDICT_FALSE
(gho.gho_flags & (GHO_F_IPIP_TUNNEL |
GHO_F_IPIP6_TUNNEL)))
{
vnet_get_outer_header (b[0], &gho);
n_tx_bytes +=
tso_segment_ipip_tunnel_fixup (vm, ptd, b[0], &gho);
}
u16 n_tx_bufs = vec_len (ptd->split_buffers);
u32 *from_seg = ptd->split_buffers;
while (n_tx_bufs > 0)
{
u32 sbi0;
vlib_buffer_t *sb0;
while (n_tx_bufs > 0 && n_left_to_next > 0)
{
sbi0 = to_next[0] = from_seg[0];
sb0 = vlib_get_buffer (vm, sbi0);
ASSERT (sb0->current_length > 0);
to_next += 1;
from_seg += 1;
n_left_to_next -= 1;
n_tx_bufs -= 1;
next0 = 0;
vnet_feature_next (&next0, sb0);
vlib_validate_buffer_enqueue_x1 (vm, node,
next_index,
to_next,
n_left_to_next,
sbi0, next0);
}
vlib_put_next_frame (vm, node, next_index,
n_left_to_next);
if (n_tx_bufs > 0)
vlib_get_next_frame (vm, node, next_index,
to_next, n_left_to_next);
}
/* The buffers were enqueued. Reset the length */
_vec_len (ptd->split_buffers) = 0;
/* Free the now segmented buffer */
vlib_buffer_free_one (vm, bi0);
b += 1;
continue;
}
}
vnet_feature_next (&next0, b[0]);
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, bi0, next0);
b += 1;
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
return frame->n_vectors;
}
static_always_inline uword
vnet_gso_inline (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame, int is_l2,
int is_ip4, int is_ip6)
{
vnet_main_t *vnm = vnet_get_main ();
vnet_hw_interface_t *hi;
if (frame->n_vectors > 0)
{
u32 *from = vlib_frame_vector_args (frame);
vlib_buffer_t *b = vlib_get_buffer (vm, from[0]);
hi = vnet_get_sup_hw_interface (vnm,
vnet_buffer (b)->sw_if_index[VLIB_TX]);
if (hi->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO)
return vnet_gso_node_inline (vm, node, frame, vnm, hi,
is_l2, is_ip4, is_ip6,
/* do_segmentation */ 0);
else
return vnet_gso_node_inline (vm, node, frame, vnm, hi,
is_l2, is_ip4, is_ip6,
/* do_segmentation */ 1);
}
return 0;
}
VLIB_NODE_FN (gso_l2_ip4_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return vnet_gso_inline (vm, node, frame, 1 /* l2 */ , 1 /* ip4 */ ,
0 /* ip6 */ );
}
VLIB_NODE_FN (gso_l2_ip6_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return vnet_gso_inline (vm, node, frame, 1 /* l2 */ , 0 /* ip4 */ ,
1 /* ip6 */ );
}
VLIB_NODE_FN (gso_ip4_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return vnet_gso_inline (vm, node, frame, 0 /* l2 */ , 1 /* ip4 */ ,
0 /* ip6 */ );
}
VLIB_NODE_FN (gso_ip6_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return vnet_gso_inline (vm, node, frame, 0 /* l2 */ , 0 /* ip4 */ ,
1 /* ip6 */ );
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (gso_l2_ip4_node) = {
.vector_size = sizeof (u32),
.format_trace = format_gso_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = 0,
.n_next_nodes = 0,
.name = "gso-l2-ip4",
};
VLIB_REGISTER_NODE (gso_l2_ip6_node) = {
.vector_size = sizeof (u32),
.format_trace = format_gso_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = 0,
.n_next_nodes = 0,
.name = "gso-l2-ip6",
};
VLIB_REGISTER_NODE (gso_ip4_node) = {
.vector_size = sizeof (u32),
.format_trace = format_gso_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = 0,
.n_next_nodes = 0,
.name = "gso-ip4",
};
VLIB_REGISTER_NODE (gso_ip6_node) = {
.vector_size = sizeof (u32),
.format_trace = format_gso_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = 0,
.n_next_nodes = 0,
.name = "gso-ip6",
};
VNET_FEATURE_INIT (gso_l2_ip4_node, static) = {
.arc_name = "l2-output-ip4",
.node_name = "gso-l2-ip4",
.runs_before = VNET_FEATURES ("l2-output-feat-arc-end"),
};
VNET_FEATURE_INIT (gso_l2_ip6_node, static) = {
.arc_name = "l2-output-ip6",
.node_name = "gso-l2-ip6",
.runs_before = VNET_FEATURES ("l2-output-feat-arc-end"),
};
VNET_FEATURE_INIT (gso_ip4_node, static) = {
.arc_name = "ip4-output",
.node_name = "gso-ip4",
.runs_before = VNET_FEATURES ("esp4-encrypt-tun","ipsec4-output-feature"),
};
VNET_FEATURE_INIT (gso_ip6_node, static) = {
.arc_name = "ip6-output",
.node_name = "gso-ip6",
.runs_before = VNET_FEATURES ("esp6-encrypt-tun","ipsec6-output-feature"),
};
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/