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/*
*------------------------------------------------------------------
* af_packet.c - linux kernel packet interface
*
* Copyright (c) 2016 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 <linux/if_packet.h>
#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
#include <vnet/ip/ip.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/devices/af_packet/af_packet.h>
#define foreach_af_packet_input_error
typedef enum
{
#define _(f,s) AF_PACKET_INPUT_ERROR_##f,
foreach_af_packet_input_error
#undef _
AF_PACKET_INPUT_N_ERROR,
} af_packet_input_error_t;
static char *af_packet_input_error_strings[] = {
#define _(n,s) s,
foreach_af_packet_input_error
#undef _
};
enum
{
AF_PACKET_INPUT_NEXT_DROP,
AF_PACKET_INPUT_NEXT_ETHERNET_INPUT,
AF_PACKET_INPUT_N_NEXT,
};
typedef struct
{
u32 next_index;
u32 hw_if_index;
int block;
struct tpacket2_hdr tph;
} af_packet_input_trace_t;
static u8 *
format_af_packet_input_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 *);
af_packet_input_trace_t *t = va_arg (*args, af_packet_input_trace_t *);
uword indent = format_get_indent (s);
s = format (s, "af_packet: hw_if_index %d next-index %d",
t->hw_if_index, t->next_index);
s =
format (s,
"\n%Utpacket2_hdr:\n%Ustatus 0x%x len %u snaplen %u mac %u net %u"
"\n%Usec 0x%x nsec 0x%x vlan %U"
#ifdef TP_STATUS_VLAN_TPID_VALID
" vlan_tpid %u"
#endif
,
format_white_space, indent + 2,
format_white_space, indent + 4,
t->tph.tp_status,
t->tph.tp_len,
t->tph.tp_snaplen,
t->tph.tp_mac,
t->tph.tp_net,
format_white_space, indent + 4,
t->tph.tp_sec,
t->tph.tp_nsec, format_ethernet_vlan_tci, t->tph.tp_vlan_tci
#ifdef TP_STATUS_VLAN_TPID_VALID
, t->tph.tp_vlan_tpid
#endif
);
return s;
}
always_inline void
buffer_add_to_chain (vlib_main_t * vm, u32 bi, u32 first_bi, u32 prev_bi)
{
vlib_buffer_t *b = vlib_get_buffer (vm, bi);
vlib_buffer_t *first_b = vlib_get_buffer (vm, first_bi);
vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_bi);
/* update first buffer */
first_b->total_length_not_including_first_buffer += b->current_length;
/* update previous buffer */
prev_b->next_buffer = bi;
prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
/* update current buffer */
b->next_buffer = 0;
#if DPDK > 0
struct rte_mbuf *mbuf = rte_mbuf_from_vlib_buffer (b);
struct rte_mbuf *first_mbuf = rte_mbuf_from_vlib_buffer (first_b);
struct rte_mbuf *prev_mbuf = rte_mbuf_from_vlib_buffer (prev_b);
first_mbuf->nb_segs++;
prev_mbuf->next = mbuf;
mbuf->data_len = b->current_length;
mbuf->data_off = RTE_PKTMBUF_HEADROOM + b->current_data;
mbuf->next = 0;
#endif
}
always_inline uword
af_packet_device_input_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * frame, u32 device_idx)
{
af_packet_main_t *apm = &af_packet_main;
af_packet_if_t *apif = pool_elt_at_index (apm->interfaces, device_idx);
struct tpacket2_hdr *tph;
u32 next_index = AF_PACKET_INPUT_NEXT_ETHERNET_INPUT;
u32 block = 0;
u32 rx_frame;
u32 n_free_bufs;
u32 n_rx_packets = 0;
u32 n_rx_bytes = 0;
u32 *to_next = 0;
u32 block_size = apif->rx_req->tp_block_size;
u32 frame_size = apif->rx_req->tp_frame_size;
u32 frame_num = apif->rx_req->tp_frame_nr;
u8 *block_start = apif->rx_ring + block * block_size;
uword n_trace = vlib_get_trace_count (vm, node);
u32 n_buffer_bytes = vlib_buffer_free_list_buffer_size (vm,
VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
u32 min_bufs = apif->rx_req->tp_frame_size / n_buffer_bytes;
int cpu_index = node->cpu_index;
if (apif->per_interface_next_index != ~0)
next_index = apif->per_interface_next_index;
n_free_bufs = vec_len (apm->rx_buffers[cpu_index]);
if (PREDICT_FALSE (n_free_bufs < VLIB_FRAME_SIZE))
{
vec_validate (apm->rx_buffers[cpu_index],
VLIB_FRAME_SIZE + n_free_bufs - 1);
n_free_bufs +=
vlib_buffer_alloc (vm, &apm->rx_buffers[cpu_index][n_free_bufs],
VLIB_FRAME_SIZE);
_vec_len (apm->rx_buffers[cpu_index]) = n_free_bufs;
}
rx_frame = apif->next_rx_frame;
tph = (struct tpacket2_hdr *) (block_start + rx_frame * frame_size);
while ((tph->tp_status & TP_STATUS_USER) && (n_free_bufs > min_bufs))
{
vlib_buffer_t *b0, *first_b0 = 0;
u32 next0 = next_index;
u32 n_left_to_next;
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while ((tph->tp_status & TP_STATUS_USER) && (n_free_bufs > min_bufs) &&
n_left_to_next)
{
u32 data_len = tph->tp_snaplen;
u32 offset = 0;
u32 bi0 = 0, first_bi0 = 0, prev_bi0;
while (data_len)
{
/* grab free buffer */
u32 last_empty_buffer =
vec_len (apm->rx_buffers[cpu_index]) - 1;
prev_bi0 = bi0;
bi0 = apm->rx_buffers[cpu_index][last_empty_buffer];
b0 = vlib_get_buffer (vm, bi0);
_vec_len (apm->rx_buffers[cpu_index]) = last_empty_buffer;
n_free_bufs--;
/* copy data */
u32 bytes_to_copy =
data_len > n_buffer_bytes ? n_buffer_bytes : data_len;
b0->current_data = 0;
clib_memcpy (vlib_buffer_get_current (b0),
(u8 *) tph + tph->tp_mac + offset, bytes_to_copy);
/* fill buffer header */
b0->current_length = bytes_to_copy;
if (offset == 0)
{
#if DPDK > 0
struct rte_mbuf *mb = rte_mbuf_from_vlib_buffer (b0);
rte_pktmbuf_data_len (mb) = b0->current_length;
rte_pktmbuf_pkt_len (mb) = b0->current_length;
#endif
b0->total_length_not_including_first_buffer = 0;
b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
vnet_buffer (b0)->sw_if_index[VLIB_RX] = apif->sw_if_index;
vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
first_bi0 = bi0;
first_b0 = vlib_get_buffer (vm, first_bi0);
}
else
buffer_add_to_chain (vm, bi0, first_bi0, prev_bi0);
offset += bytes_to_copy;
data_len -= bytes_to_copy;
}
n_rx_packets++;
n_rx_bytes += tph->tp_snaplen;
to_next[0] = first_bi0;
to_next += 1;
n_left_to_next--;
/* trace */
VLIB_BUFFER_TRACE_TRAJECTORY_INIT (first_b0);
if (PREDICT_FALSE (n_trace > 0))
{
af_packet_input_trace_t *tr;
vlib_trace_buffer (vm, node, next0, first_b0, /* follow_chain */
0);
vlib_set_trace_count (vm, node, --n_trace);
tr = vlib_add_trace (vm, node, first_b0, sizeof (*tr));
tr->next_index = next0;
tr->hw_if_index = apif->hw_if_index;
clib_memcpy (&tr->tph, tph, sizeof (struct tpacket2_hdr));
}
/* enque and take next packet */
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, first_bi0, next0);
/* next packet */
tph->tp_status = TP_STATUS_KERNEL;
rx_frame = (rx_frame + 1) % frame_num;
tph = (struct tpacket2_hdr *) (block_start + rx_frame * frame_size);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
apif->next_rx_frame = rx_frame;
vlib_increment_combined_counter
(vnet_get_main ()->interface_main.combined_sw_if_counters
+ VNET_INTERFACE_COUNTER_RX,
os_get_cpu_number (), apif->hw_if_index, n_rx_packets, n_rx_bytes);
return n_rx_packets;
}
static uword
af_packet_input_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
int i;
u32 n_rx_packets = 0;
af_packet_main_t *apm = &af_packet_main;
/* *INDENT-OFF* */
clib_bitmap_foreach (i, apm->pending_input_bitmap,
({
clib_bitmap_set (apm->pending_input_bitmap, i, 0);
n_rx_packets += af_packet_device_input_fn(vm, node, frame, i);
}));
/* *INDENT-ON* */
return n_rx_packets;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (af_packet_input_node) = {
.function = af_packet_input_fn,
.name = "af-packet-input",
.format_trace = format_af_packet_input_trace,
.type = VLIB_NODE_TYPE_INPUT,
.state = VLIB_NODE_STATE_INTERRUPT,
.n_errors = AF_PACKET_INPUT_N_ERROR,
.error_strings = af_packet_input_error_strings,
.n_next_nodes = AF_PACKET_INPUT_N_NEXT,
.next_nodes = {
[AF_PACKET_INPUT_NEXT_DROP] = "error-drop",
[AF_PACKET_INPUT_NEXT_ETHERNET_INPUT] = "ethernet-input",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (af_packet_input_node, af_packet_input_fn)
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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