blob: 605fd584e2dcdabcfd06024ab9a20c279eb4cea5 [file] [log] [blame]
/*
* Copyright (c) 2017-2019 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 <math.h>
#include <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vppinfra/elog.h>
#include <vnet/session/transport.h>
#include <vnet/session/session.h>
#include <vnet/session/application.h>
#include <vnet/session/application_interface.h>
#include <vnet/session/application_local.h>
#include <vnet/session/session_debug.h>
#include <svm/queue.h>
static void session_mq_accepted_reply_handler (void *data);
static void
accepted_notify_cb (void *data, u32 data_len)
{
session_mq_accepted_reply_handler (data);
}
static void
session_mq_accepted_reply_handler (void *data)
{
session_accepted_reply_msg_t *mp = (session_accepted_reply_msg_t *) data;
vnet_disconnect_args_t _a = { 0 }, *a = &_a;
session_state_t old_state;
app_worker_t *app_wrk;
session_t *s;
/* Server isn't interested, kill the session */
if (mp->retval)
{
a->app_index = mp->context;
a->handle = mp->handle;
vnet_disconnect_session (a);
return;
}
/* Mail this back from the main thread. We're not polling in main
* thread so we're using other workers for notifications. */
if (vlib_num_workers () && vlib_get_thread_index () != 0
&& session_thread_from_handle (mp->handle) == 0)
{
vl_api_rpc_call_main_thread (accepted_notify_cb, data,
sizeof (session_accepted_reply_msg_t));
return;
}
s = session_get_from_handle_if_valid (mp->handle);
if (!s)
return;
app_wrk = app_worker_get (s->app_wrk_index);
if (app_wrk->app_index != mp->context)
{
clib_warning ("app doesn't own session");
return;
}
if (!session_has_transport (s))
{
s->session_state = SESSION_STATE_READY;
if (ct_session_connect_notify (s))
return;
}
else
{
old_state = s->session_state;
s->session_state = SESSION_STATE_READY;
if (!svm_fifo_is_empty_prod (s->rx_fifo))
app_worker_lock_and_send_event (app_wrk, s, SESSION_IO_EVT_RX);
/* Closed while waiting for app to reply. Resend disconnect */
if (old_state >= SESSION_STATE_TRANSPORT_CLOSING)
{
app_worker_close_notify (app_wrk, s);
s->session_state = old_state;
return;
}
}
}
static void
session_mq_reset_reply_handler (void *data)
{
vnet_disconnect_args_t _a = { 0 }, *a = &_a;
session_reset_reply_msg_t *mp;
app_worker_t *app_wrk;
session_t *s;
application_t *app;
u32 index, thread_index;
mp = (session_reset_reply_msg_t *) data;
app = application_lookup (mp->context);
if (!app)
return;
session_parse_handle (mp->handle, &index, &thread_index);
s = session_get_if_valid (index, thread_index);
/* Session was already closed or already cleaned up */
if (!s || s->session_state != SESSION_STATE_TRANSPORT_CLOSING)
return;
app_wrk = app_worker_get (s->app_wrk_index);
if (!app_wrk || app_wrk->app_index != app->app_index)
{
clib_warning ("App % does not own handle 0x%lx!", app->app_index,
mp->handle);
return;
}
/* Client objected to resetting the session, log and continue */
if (mp->retval)
{
clib_warning ("client retval %d", mp->retval);
return;
}
/* This comes as a response to a reset, transport only waiting for
* confirmation to remove connection state, no need to disconnect */
a->handle = mp->handle;
a->app_index = app->app_index;
vnet_disconnect_session (a);
}
static void
session_mq_disconnected_handler (void *data)
{
session_disconnected_reply_msg_t *rmp;
vnet_disconnect_args_t _a, *a = &_a;
svm_msg_q_msg_t _msg, *msg = &_msg;
session_disconnected_msg_t *mp;
app_worker_t *app_wrk;
session_event_t *evt;
session_t *s;
application_t *app;
int rv = 0;
mp = (session_disconnected_msg_t *) data;
if (!(s = session_get_from_handle_if_valid (mp->handle)))
{
clib_warning ("could not disconnect handle %llu", mp->handle);
return;
}
app_wrk = app_worker_get (s->app_wrk_index);
app = application_lookup (mp->client_index);
if (!(app_wrk && app && app->app_index == app_wrk->app_index))
{
clib_warning ("could not disconnect session: %llu app: %u",
mp->handle, mp->client_index);
return;
}
a->handle = mp->handle;
a->app_index = app_wrk->wrk_index;
rv = vnet_disconnect_session (a);
svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
SESSION_MQ_CTRL_EVT_RING,
SVM_Q_WAIT, msg);
svm_msg_q_unlock (app_wrk->event_queue);
evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
clib_memset (evt, 0, sizeof (*evt));
evt->event_type = SESSION_CTRL_EVT_DISCONNECTED_REPLY;
rmp = (session_disconnected_reply_msg_t *) evt->data;
rmp->handle = mp->handle;
rmp->context = mp->context;
rmp->retval = rv;
svm_msg_q_add (app_wrk->event_queue, msg, SVM_Q_WAIT);
}
static void
session_mq_disconnected_reply_handler (void *data)
{
session_disconnected_reply_msg_t *mp;
vnet_disconnect_args_t _a, *a = &_a;
application_t *app;
mp = (session_disconnected_reply_msg_t *) data;
/* Client objected to disconnecting the session, log and continue */
if (mp->retval)
{
clib_warning ("client retval %d", mp->retval);
return;
}
/* Disconnect has been confirmed. Confirm close to transport */
app = application_lookup (mp->context);
if (app)
{
a->handle = mp->handle;
a->app_index = app->app_index;
vnet_disconnect_session (a);
}
}
static void
session_mq_worker_update_handler (void *data)
{
session_worker_update_msg_t *mp = (session_worker_update_msg_t *) data;
session_worker_update_reply_msg_t *rmp;
svm_msg_q_msg_t _msg, *msg = &_msg;
app_worker_t *app_wrk;
u32 owner_app_wrk_map;
session_event_t *evt;
session_t *s;
application_t *app;
app = application_lookup (mp->client_index);
if (!app)
return;
if (!(s = session_get_from_handle_if_valid (mp->handle)))
{
clib_warning ("invalid handle %llu", mp->handle);
return;
}
app_wrk = app_worker_get (s->app_wrk_index);
if (app_wrk->app_index != app->app_index)
{
clib_warning ("app %u does not own session %llu", app->app_index,
mp->handle);
return;
}
owner_app_wrk_map = app_wrk->wrk_map_index;
app_wrk = application_get_worker (app, mp->wrk_index);
/* This needs to come from the new owner */
if (mp->req_wrk_index == owner_app_wrk_map)
{
session_req_worker_update_msg_t *wump;
svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
SESSION_MQ_CTRL_EVT_RING,
SVM_Q_WAIT, msg);
svm_msg_q_unlock (app_wrk->event_queue);
evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
clib_memset (evt, 0, sizeof (*evt));
evt->event_type = SESSION_CTRL_EVT_REQ_WORKER_UPDATE;
wump = (session_req_worker_update_msg_t *) evt->data;
wump->session_handle = mp->handle;
svm_msg_q_add (app_wrk->event_queue, msg, SVM_Q_WAIT);
return;
}
app_worker_own_session (app_wrk, s);
/*
* Send reply
*/
svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
SESSION_MQ_CTRL_EVT_RING,
SVM_Q_WAIT, msg);
svm_msg_q_unlock (app_wrk->event_queue);
evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
clib_memset (evt, 0, sizeof (*evt));
evt->event_type = SESSION_CTRL_EVT_WORKER_UPDATE_REPLY;
rmp = (session_worker_update_reply_msg_t *) evt->data;
rmp->handle = mp->handle;
rmp->rx_fifo = pointer_to_uword (s->rx_fifo);
rmp->tx_fifo = pointer_to_uword (s->tx_fifo);
rmp->segment_handle = session_segment_handle (s);
svm_msg_q_add (app_wrk->event_queue, msg, SVM_Q_WAIT);
/*
* Retransmit messages that may have been lost
*/
if (s->tx_fifo && !svm_fifo_is_empty (s->tx_fifo))
session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX);
if (s->rx_fifo && !svm_fifo_is_empty (s->rx_fifo))
app_worker_lock_and_send_event (app_wrk, s, SESSION_IO_EVT_RX);
if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSING)
app_worker_close_notify (app_wrk, s);
}
vlib_node_registration_t session_queue_node;
typedef struct
{
u32 session_index;
u32 server_thread_index;
} session_queue_trace_t;
/* packet trace format function */
static u8 *
format_session_queue_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 *);
session_queue_trace_t *t = va_arg (*args, session_queue_trace_t *);
s = format (s, "SESSION_QUEUE: session index %d, server thread index %d",
t->session_index, t->server_thread_index);
return s;
}
#define foreach_session_queue_error \
_(TX, "Packets transmitted") \
_(TIMER, "Timer events") \
_(NO_BUFFER, "Out of buffers")
typedef enum
{
#define _(sym,str) SESSION_QUEUE_ERROR_##sym,
foreach_session_queue_error
#undef _
SESSION_QUEUE_N_ERROR,
} session_queue_error_t;
static char *session_queue_error_strings[] = {
#define _(sym,string) string,
foreach_session_queue_error
#undef _
};
enum
{
SESSION_TX_NO_BUFFERS = -2,
SESSION_TX_NO_DATA,
SESSION_TX_OK
};
static void
session_tx_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
u32 next_index, u32 * to_next, u16 n_segs,
session_t * s, u32 n_trace)
{
session_queue_trace_t *t;
vlib_buffer_t *b;
int i;
for (i = 0; i < clib_min (n_trace, n_segs); i++)
{
b = vlib_get_buffer (vm, to_next[i - n_segs]);
vlib_trace_buffer (vm, node, next_index, b, 1 /* follow_chain */ );
t = vlib_add_trace (vm, node, b, sizeof (*t));
t->session_index = s->session_index;
t->server_thread_index = s->thread_index;
}
vlib_set_trace_count (vm, node, n_trace - i);
}
always_inline void
session_tx_fifo_chain_tail (vlib_main_t * vm, session_tx_context_t * ctx,
vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
{
vlib_buffer_t *chain_b, *prev_b;
u32 chain_bi0, to_deq, left_from_seg;
session_worker_t *wrk;
u16 len_to_deq, n_bytes_read;
u8 *data, j;
wrk = session_main_get_worker (ctx->s->thread_index);
b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
b->total_length_not_including_first_buffer = 0;
chain_b = b;
left_from_seg = clib_min (ctx->snd_mss - b->current_length,
ctx->left_to_snd);
to_deq = left_from_seg;
for (j = 1; j < ctx->n_bufs_per_seg; j++)
{
prev_b = chain_b;
len_to_deq = clib_min (to_deq, ctx->deq_per_buf);
*n_bufs -= 1;
chain_bi0 = wrk->tx_buffers[*n_bufs];
chain_b = vlib_get_buffer (vm, chain_bi0);
chain_b->current_data = 0;
data = vlib_buffer_get_current (chain_b);
if (peek_data)
{
n_bytes_read = svm_fifo_peek (ctx->s->tx_fifo,
ctx->tx_offset, len_to_deq, data);
ctx->tx_offset += n_bytes_read;
}
else
{
if (ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
{
svm_fifo_t *f = ctx->s->tx_fifo;
session_dgram_hdr_t *hdr = &ctx->hdr;
u16 deq_now;
deq_now = clib_min (hdr->data_length - hdr->data_offset,
len_to_deq);
n_bytes_read = svm_fifo_peek (f, hdr->data_offset, deq_now,
data);
ASSERT (n_bytes_read > 0);
hdr->data_offset += n_bytes_read;
if (hdr->data_offset == hdr->data_length)
{
u32 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
svm_fifo_dequeue_drop (f, offset);
}
}
else
n_bytes_read = svm_fifo_dequeue_nowait (ctx->s->tx_fifo,
len_to_deq, data);
}
ASSERT (n_bytes_read == len_to_deq);
chain_b->current_length = n_bytes_read;
b->total_length_not_including_first_buffer += chain_b->current_length;
/* update previous buffer */
prev_b->next_buffer = chain_bi0;
prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
/* update current buffer */
chain_b->next_buffer = 0;
to_deq -= n_bytes_read;
if (to_deq == 0)
break;
}
ASSERT (to_deq == 0
&& b->total_length_not_including_first_buffer == left_from_seg);
ctx->left_to_snd -= left_from_seg;
}
always_inline void
session_tx_fill_buffer (vlib_main_t * vm, session_tx_context_t * ctx,
vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
{
u32 len_to_deq;
u8 *data0;
int n_bytes_read;
/*
* Start with the first buffer in chain
*/
b->error = 0;
b->flags = VNET_BUFFER_F_LOCALLY_ORIGINATED;
b->current_data = 0;
data0 = vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
len_to_deq = clib_min (ctx->left_to_snd, ctx->deq_per_first_buf);
if (peek_data)
{
n_bytes_read = svm_fifo_peek (ctx->s->tx_fifo, ctx->tx_offset,
len_to_deq, data0);
ASSERT (n_bytes_read > 0);
/* Keep track of progress locally, transport is also supposed to
* increment it independently when pushing the header */
ctx->tx_offset += n_bytes_read;
}
else
{
if (ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
{
session_dgram_hdr_t *hdr = &ctx->hdr;
svm_fifo_t *f = ctx->s->tx_fifo;
u16 deq_now;
u32 offset;
ASSERT (hdr->data_length > hdr->data_offset);
deq_now = clib_min (hdr->data_length - hdr->data_offset,
len_to_deq);
offset = hdr->data_offset + SESSION_CONN_HDR_LEN;
n_bytes_read = svm_fifo_peek (f, offset, deq_now, data0);
ASSERT (n_bytes_read > 0);
if (ctx->s->session_state == SESSION_STATE_LISTENING)
{
ip_copy (&ctx->tc->rmt_ip, &hdr->rmt_ip, ctx->tc->is_ip4);
ctx->tc->rmt_port = hdr->rmt_port;
}
hdr->data_offset += n_bytes_read;
if (hdr->data_offset == hdr->data_length)
{
offset = hdr->data_length + SESSION_CONN_HDR_LEN;
svm_fifo_dequeue_drop (f, offset);
}
}
else
{
n_bytes_read = svm_fifo_dequeue_nowait (ctx->s->tx_fifo,
len_to_deq, data0);
ASSERT (n_bytes_read > 0);
}
}
b->current_length = n_bytes_read;
ctx->left_to_snd -= n_bytes_read;
/*
* Fill in the remaining buffers in the chain, if any
*/
if (PREDICT_FALSE (ctx->n_bufs_per_seg > 1 && ctx->left_to_snd))
session_tx_fifo_chain_tail (vm, ctx, b, n_bufs, peek_data);
/* *INDENT-OFF* */
SESSION_EVT_DBG(SESSION_EVT_DEQ, ctx->s, ({
ed->data[0] = SESSION_IO_EVT_TX;
ed->data[1] = ctx->max_dequeue;
ed->data[2] = len_to_deq;
ed->data[3] = ctx->left_to_snd;
}));
/* *INDENT-ON* */
}
always_inline u8
session_tx_not_ready (session_t * s, u8 peek_data)
{
if (peek_data)
{
/* Can retransmit for closed sessions but can't send new data if
* session is not ready or closed */
if (s->session_state < SESSION_STATE_READY)
return 1;
if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED)
return 2;
}
return 0;
}
always_inline transport_connection_t *
session_tx_get_transport (session_tx_context_t * ctx, u8 peek_data)
{
if (peek_data)
{
return ctx->transport_vft->get_connection (ctx->s->connection_index,
ctx->s->thread_index);
}
else
{
if (ctx->s->session_state == SESSION_STATE_LISTENING)
return ctx->transport_vft->get_listener (ctx->s->connection_index);
else
{
return ctx->transport_vft->get_connection (ctx->s->connection_index,
ctx->s->thread_index);
}
}
}
always_inline void
session_tx_set_dequeue_params (vlib_main_t * vm, session_tx_context_t * ctx,
u32 max_segs, u8 peek_data)
{
u32 n_bytes_per_buf, n_bytes_per_seg;
ctx->max_dequeue = svm_fifo_max_dequeue_cons (ctx->s->tx_fifo);
if (peek_data)
{
/* Offset in rx fifo from where to peek data */
ctx->tx_offset = ctx->transport_vft->tx_fifo_offset (ctx->tc);
if (PREDICT_FALSE (ctx->tx_offset >= ctx->max_dequeue))
{
ctx->max_len_to_snd = 0;
return;
}
ctx->max_dequeue -= ctx->tx_offset;
}
else
{
if (ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
{
if (ctx->max_dequeue <= sizeof (ctx->hdr))
{
ctx->max_len_to_snd = 0;
return;
}
svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
(u8 *) & ctx->hdr);
ASSERT (ctx->hdr.data_length > ctx->hdr.data_offset);
ctx->max_dequeue = ctx->hdr.data_length - ctx->hdr.data_offset;
}
}
ASSERT (ctx->max_dequeue > 0);
/* Ensure we're not writing more than transport window allows */
if (ctx->max_dequeue < ctx->snd_space)
{
/* Constrained by tx queue. Try to send only fully formed segments */
ctx->max_len_to_snd =
(ctx->max_dequeue > ctx->snd_mss) ?
ctx->max_dequeue - ctx->max_dequeue % ctx->snd_mss : ctx->max_dequeue;
/* TODO Nagle ? */
}
else
{
/* Expectation is that snd_space0 is already a multiple of snd_mss */
ctx->max_len_to_snd = ctx->snd_space;
}
/* Check if we're tx constrained by the node */
ctx->n_segs_per_evt = ceil ((f64) ctx->max_len_to_snd / ctx->snd_mss);
if (ctx->n_segs_per_evt > max_segs)
{
ctx->n_segs_per_evt = max_segs;
ctx->max_len_to_snd = max_segs * ctx->snd_mss;
}
n_bytes_per_buf = vlib_buffer_get_default_data_size (vm);
ASSERT (n_bytes_per_buf > TRANSPORT_MAX_HDRS_LEN);
n_bytes_per_seg = TRANSPORT_MAX_HDRS_LEN + ctx->snd_mss;
ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf);
ctx->deq_per_buf = clib_min (ctx->snd_mss, n_bytes_per_buf);
ctx->deq_per_first_buf = clib_min (ctx->snd_mss,
n_bytes_per_buf -
TRANSPORT_MAX_HDRS_LEN);
}
always_inline int
session_tx_fifo_read_and_snd_i (vlib_main_t * vm, vlib_node_runtime_t * node,
session_worker_t * wrk,
session_event_t * e, int *n_tx_packets,
u8 peek_data)
{
u32 next_index, next0, next1, *to_next, n_left_to_next, n_left, pbi;
u32 n_trace = vlib_get_trace_count (vm, node), n_bufs_needed = 0;
session_main_t *smm = &session_main;
session_tx_context_t *ctx = &wrk->ctx;
transport_proto_t tp;
vlib_buffer_t *pb;
u16 n_bufs, rv;
if (PREDICT_FALSE ((rv = session_tx_not_ready (ctx->s, peek_data))))
{
if (rv < 2)
vec_add1 (wrk->pending_event_vector, *e);
return SESSION_TX_NO_DATA;
}
next_index = smm->session_type_to_next[ctx->s->session_type];
next0 = next1 = next_index;
tp = session_get_transport_proto (ctx->s);
ctx->transport_vft = transport_protocol_get_vft (tp);
ctx->tc = session_tx_get_transport (ctx, peek_data);
ctx->snd_mss = ctx->transport_vft->send_mss (ctx->tc);
if (PREDICT_FALSE (e->event_type == SESSION_IO_EVT_TX_FLUSH))
{
if (ctx->transport_vft->flush_data)
ctx->transport_vft->flush_data (ctx->tc);
}
ctx->snd_space = transport_connection_snd_space (ctx->tc,
vm->clib_time.
last_cpu_time,
ctx->snd_mss);
if (ctx->snd_space == 0 || ctx->snd_mss == 0)
{
vec_add1 (wrk->pending_event_vector, *e);
return SESSION_TX_NO_DATA;
}
/* Allow enqueuing of a new event */
svm_fifo_unset_event (ctx->s->tx_fifo);
/* Check how much we can pull. */
session_tx_set_dequeue_params (vm, ctx, VLIB_FRAME_SIZE - *n_tx_packets,
peek_data);
if (PREDICT_FALSE (!ctx->max_len_to_snd))
return SESSION_TX_NO_DATA;
n_bufs_needed = ctx->n_segs_per_evt * ctx->n_bufs_per_seg;
vec_validate_aligned (wrk->tx_buffers, n_bufs_needed - 1,
CLIB_CACHE_LINE_BYTES);
n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, n_bufs_needed);
if (PREDICT_FALSE (n_bufs < n_bufs_needed))
{
if (n_bufs)
vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
vec_add1 (wrk->pending_event_vector, *e);
return SESSION_TX_NO_BUFFERS;
}
/*
* Write until we fill up a frame
*/
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
if (PREDICT_FALSE (ctx->n_segs_per_evt > n_left_to_next))
{
ctx->n_segs_per_evt = n_left_to_next;
ctx->max_len_to_snd = ctx->snd_mss * n_left_to_next;
}
ctx->left_to_snd = ctx->max_len_to_snd;
n_left = ctx->n_segs_per_evt;
while (n_left >= 4)
{
vlib_buffer_t *b0, *b1;
u32 bi0, bi1;
pbi = wrk->tx_buffers[n_bufs - 3];
pb = vlib_get_buffer (vm, pbi);
vlib_prefetch_buffer_header (pb, STORE);
pbi = wrk->tx_buffers[n_bufs - 4];
pb = vlib_get_buffer (vm, pbi);
vlib_prefetch_buffer_header (pb, STORE);
to_next[0] = bi0 = wrk->tx_buffers[--n_bufs];
to_next[1] = bi1 = wrk->tx_buffers[--n_bufs];
b0 = vlib_get_buffer (vm, bi0);
b1 = vlib_get_buffer (vm, bi1);
session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
session_tx_fill_buffer (vm, ctx, b1, &n_bufs, peek_data);
ctx->transport_vft->push_header (ctx->tc, b0);
ctx->transport_vft->push_header (ctx->tc, b1);
to_next += 2;
n_left_to_next -= 2;
n_left -= 2;
VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1);
vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
n_left_to_next, bi0, bi1, next0,
next1);
}
while (n_left)
{
vlib_buffer_t *b0;
u32 bi0;
if (n_left > 1)
{
pbi = wrk->tx_buffers[n_bufs - 2];
pb = vlib_get_buffer (vm, pbi);
vlib_prefetch_buffer_header (pb, STORE);
}
to_next[0] = bi0 = wrk->tx_buffers[--n_bufs];
b0 = vlib_get_buffer (vm, bi0);
session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
/* Ask transport to push header after current_length and
* total_length_not_including_first_buffer are updated */
ctx->transport_vft->push_header (ctx->tc, b0);
to_next += 1;
n_left_to_next -= 1;
n_left -= 1;
VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, bi0, next0);
}
if (PREDICT_FALSE (n_trace > 0))
session_tx_trace_frame (vm, node, next_index, to_next,
ctx->n_segs_per_evt, ctx->s, n_trace);
if (PREDICT_FALSE (n_bufs))
{
clib_warning ("not all buffers consumed");
vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
}
*n_tx_packets += ctx->n_segs_per_evt;
transport_connection_update_tx_stats (ctx->tc, ctx->max_len_to_snd);
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
/* If we couldn't dequeue all bytes mark as partially read */
ASSERT (ctx->left_to_snd == 0);
if (ctx->max_len_to_snd < ctx->max_dequeue)
if (svm_fifo_set_event (ctx->s->tx_fifo))
vec_add1 (wrk->pending_event_vector, *e);
if (!peek_data && ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
{
/* Fix dgram pre header */
if (ctx->max_len_to_snd < ctx->max_dequeue)
svm_fifo_overwrite_head (ctx->s->tx_fifo, (u8 *) & ctx->hdr,
sizeof (session_dgram_pre_hdr_t));
/* More data needs to be read */
else if (svm_fifo_max_dequeue_cons (ctx->s->tx_fifo) > 0)
if (svm_fifo_set_event (ctx->s->tx_fifo))
vec_add1 (wrk->pending_event_vector, *e);
}
return SESSION_TX_OK;
}
int
session_tx_fifo_peek_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node,
session_worker_t * wrk,
session_event_t * e, int *n_tx_pkts)
{
return session_tx_fifo_read_and_snd_i (vm, node, wrk, e, n_tx_pkts, 1);
}
int
session_tx_fifo_dequeue_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node,
session_worker_t * wrk,
session_event_t * e, int *n_tx_pkts)
{
return session_tx_fifo_read_and_snd_i (vm, node, wrk, e, n_tx_pkts, 0);
}
int
session_tx_fifo_dequeue_internal (vlib_main_t * vm,
vlib_node_runtime_t * node,
session_worker_t * wrk,
session_event_t * e, int *n_tx_pkts)
{
session_t *s = wrk->ctx.s;
if (PREDICT_FALSE (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED))
return 0;
svm_fifo_unset_event (s->tx_fifo);
return transport_custom_tx (session_get_transport_proto (s), s);
}
always_inline session_t *
session_event_get_session (session_event_t * e, u8 thread_index)
{
return session_get_if_valid (e->session_index, thread_index);
}
static void
session_update_dispatch_period (session_worker_t * wrk, f64 now,
u32 thread_index)
{
if (wrk->last_tx_packets)
{
f64 sample = now - wrk->last_vlib_time;
wrk->dispatch_period = (wrk->dispatch_period + sample) * 0.5;
}
wrk->last_vlib_time = now;
}
static uword
session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
session_main_t *smm = vnet_get_session_main ();
u32 thread_index = vm->thread_index, n_to_dequeue, n_events;
session_worker_t *wrk = &smm->wrk[thread_index];
session_event_t *e, *fifo_events;
svm_msg_q_msg_t _msg, *msg = &_msg;
f64 now = vlib_time_now (vm);
int n_tx_packets = 0, i, rv;
app_worker_t *app_wrk;
svm_msg_q_t *mq;
void (*fp) (void *);
SESSION_EVT_DBG (SESSION_EVT_POLL_GAP_TRACK, smm, thread_index);
/*
* Update transport time
*/
session_update_dispatch_period (wrk, now, thread_index);
transport_update_time (now, thread_index);
SESSION_EVT_DBG (SESSION_EVT_DEQ_NODE, 0);
/* Make sure postponed events are handled first */
fifo_events = wrk->free_event_vector;
vec_append (fifo_events, wrk->postponed_event_vector);
_vec_len (wrk->postponed_event_vector) = 0;
/* Try to dequeue what is available. Don't wait for lock.
* XXX: we may need priorities here */
mq = wrk->vpp_event_queue;
n_to_dequeue = svm_msg_q_size (mq);
if (n_to_dequeue && svm_msg_q_try_lock (mq) == 0)
{
for (i = 0; i < n_to_dequeue; i++)
{
vec_add2 (fifo_events, e, 1);
svm_msg_q_sub_w_lock (mq, msg);
/* Works because reply messages are smaller than a session evt.
* If we ever need to support bigger messages this needs to be
* fixed */
clib_memcpy_fast (e, svm_msg_q_msg_data (mq, msg), sizeof (*e));
svm_msg_q_free_msg (mq, msg);
}
svm_msg_q_unlock (mq);
}
vec_append (fifo_events, wrk->pending_event_vector);
vec_append (fifo_events, wrk->pending_disconnects);
_vec_len (wrk->pending_event_vector) = 0;
_vec_len (wrk->pending_disconnects) = 0;
n_events = vec_len (fifo_events);
if (PREDICT_FALSE (!n_events))
return 0;
for (i = 0; i < n_events; i++)
{
session_t *s; /* $$$ prefetch 1 ahead maybe */
session_event_t *e;
u8 need_tx_ntf;
e = &fifo_events[i];
switch (e->event_type)
{
case SESSION_IO_EVT_TX_FLUSH:
case SESSION_IO_EVT_TX:
/* Don't try to send more that one frame per dispatch cycle */
if (n_tx_packets == VLIB_FRAME_SIZE)
{
vec_add1 (wrk->postponed_event_vector, *e);
break;
}
s = session_event_get_session (e, thread_index);
if (PREDICT_FALSE (!s))
{
clib_warning ("session was freed!");
continue;
}
CLIB_PREFETCH (s->tx_fifo, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
wrk->ctx.s = s;
/* Spray packets in per session type frames, since they go to
* different nodes */
rv = (smm->session_tx_fns[s->session_type]) (vm, node, wrk, e,
&n_tx_packets);
if (PREDICT_TRUE (rv == SESSION_TX_OK))
{
need_tx_ntf = svm_fifo_needs_tx_ntf (s->tx_fifo,
wrk->ctx.max_len_to_snd);
if (PREDICT_FALSE (need_tx_ntf))
session_dequeue_notify (s);
}
else if (PREDICT_FALSE (rv == SESSION_TX_NO_BUFFERS))
{
vlib_node_increment_counter (vm, node->node_index,
SESSION_QUEUE_ERROR_NO_BUFFER, 1);
continue;
}
break;
case SESSION_IO_EVT_RX:
s = session_event_get_session (e, thread_index);
if (!s)
break;
transport_app_rx_evt (session_get_transport_proto (s),
s->connection_index, s->thread_index);
break;
case SESSION_CTRL_EVT_CLOSE:
s = session_get_from_handle_if_valid (e->session_handle);
if (PREDICT_FALSE (!s))
break;
/* Make sure session disconnects run after the pending list is
* drained, i.e., postpone if the first time. If not the first
* and the tx queue is still not empty, try to wait for some
* dispatch cycles */
if (!e->postponed
|| (e->postponed < 200
&& svm_fifo_max_dequeue_cons (s->tx_fifo)))
{
e->postponed += 1;
vec_add1 (wrk->pending_disconnects, *e);
continue;
}
session_transport_close (s);
break;
case SESSION_IO_EVT_BUILTIN_RX:
s = session_event_get_session (e, thread_index);
if (PREDICT_FALSE (!s || s->session_state >= SESSION_STATE_CLOSING))
continue;
svm_fifo_unset_event (s->rx_fifo);
app_wrk = app_worker_get (s->app_wrk_index);
app_worker_builtin_rx (app_wrk, s);
break;
case SESSION_IO_EVT_BUILTIN_TX:
s = session_get_from_handle_if_valid (e->session_handle);
wrk->ctx.s = s;
if (PREDICT_TRUE (s != 0))
session_tx_fifo_dequeue_internal (vm, node, wrk, e,
&n_tx_packets);
break;
case SESSION_CTRL_EVT_RPC:
fp = e->rpc_args.fp;
(*fp) (e->rpc_args.arg);
break;
case SESSION_CTRL_EVT_DISCONNECTED:
session_mq_disconnected_handler (e->data);
break;
case SESSION_CTRL_EVT_ACCEPTED_REPLY:
session_mq_accepted_reply_handler (e->data);
break;
case SESSION_CTRL_EVT_CONNECTED_REPLY:
break;
case SESSION_CTRL_EVT_DISCONNECTED_REPLY:
session_mq_disconnected_reply_handler (e->data);
break;
case SESSION_CTRL_EVT_RESET_REPLY:
session_mq_reset_reply_handler (e->data);
break;
case SESSION_CTRL_EVT_WORKER_UPDATE:
session_mq_worker_update_handler (e->data);
break;
default:
clib_warning ("unhandled event type %d", e->event_type);
}
}
_vec_len (fifo_events) = 0;
wrk->free_event_vector = fifo_events;
wrk->last_tx_packets = n_tx_packets;
vlib_node_increment_counter (vm, session_queue_node.index,
SESSION_QUEUE_ERROR_TX, n_tx_packets);
SESSION_EVT_DBG (SESSION_EVT_DISPATCH_END, smm, thread_index);
return n_tx_packets;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (session_queue_node) =
{
.function = session_queue_node_fn,
.name = "session-queue",
.format_trace = format_session_queue_trace,
.type = VLIB_NODE_TYPE_INPUT,
.n_errors = ARRAY_LEN (session_queue_error_strings),
.error_strings = session_queue_error_strings,
.state = VLIB_NODE_STATE_DISABLED,
};
/* *INDENT-ON* */
void
dump_thread_0_event_queue (void)
{
session_main_t *smm = vnet_get_session_main ();
vlib_main_t *vm = &vlib_global_main;
u32 my_thread_index = vm->thread_index;
session_event_t _e, *e = &_e;
svm_msg_q_ring_t *ring;
session_t *s0;
svm_msg_q_msg_t *msg;
svm_msg_q_t *mq;
int i, index;
mq = smm->wrk[my_thread_index].vpp_event_queue;
index = mq->q->head;
for (i = 0; i < mq->q->cursize; i++)
{
msg = (svm_msg_q_msg_t *) (&mq->q->data[0] + mq->q->elsize * index);
ring = svm_msg_q_ring (mq, msg->ring_index);
clib_memcpy_fast (e, svm_msg_q_msg_data (mq, msg), ring->elsize);
switch (e->event_type)
{
case SESSION_IO_EVT_TX:
s0 = session_event_get_session (e, my_thread_index);
fformat (stdout, "[%04d] TX session %d\n", i, s0->session_index);
break;
case SESSION_CTRL_EVT_CLOSE:
s0 = session_get_from_handle (e->session_handle);
fformat (stdout, "[%04d] disconnect session %d\n", i,
s0->session_index);
break;
case SESSION_IO_EVT_BUILTIN_RX:
s0 = session_event_get_session (e, my_thread_index);
fformat (stdout, "[%04d] builtin_rx %d\n", i, s0->session_index);
break;
case SESSION_CTRL_EVT_RPC:
fformat (stdout, "[%04d] RPC call %llx with %llx\n",
i, (u64) (uword) (e->rpc_args.fp),
(u64) (uword) (e->rpc_args.arg));
break;
default:
fformat (stdout, "[%04d] unhandled event type %d\n",
i, e->event_type);
break;
}
index++;
if (index == mq->q->maxsize)
index = 0;
}
}
static u8
session_node_cmp_event (session_event_t * e, svm_fifo_t * f)
{
session_t *s;
switch (e->event_type)
{
case SESSION_IO_EVT_RX:
case SESSION_IO_EVT_TX:
case SESSION_IO_EVT_BUILTIN_RX:
if (e->session_index == f->master_session_index)
return 1;
break;
case SESSION_CTRL_EVT_CLOSE:
break;
case SESSION_CTRL_EVT_RPC:
s = session_get_from_handle (e->session_handle);
if (!s)
{
clib_warning ("session has event but doesn't exist!");
break;
}
if (s->rx_fifo == f || s->tx_fifo == f)
return 1;
break;
default:
break;
}
return 0;
}
u8
session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e)
{
session_event_t *pending_event_vector, *evt;
session_worker_t *wrk;
int i, index, found = 0;
svm_msg_q_msg_t *msg;
svm_msg_q_ring_t *ring;
svm_msg_q_t *mq;
u8 thread_index;
ASSERT (e);
thread_index = f->master_thread_index;
wrk = session_main_get_worker (thread_index);
/*
* Search evt queue
*/
mq = wrk->vpp_event_queue;
index = mq->q->head;
for (i = 0; i < mq->q->cursize; i++)
{
msg = (svm_msg_q_msg_t *) (&mq->q->data[0] + mq->q->elsize * index);
ring = svm_msg_q_ring (mq, msg->ring_index);
clib_memcpy_fast (e, svm_msg_q_msg_data (mq, msg), ring->elsize);
found = session_node_cmp_event (e, f);
if (found)
return 1;
if (++index == mq->q->maxsize)
index = 0;
}
/*
* Search pending events vector
*/
pending_event_vector = wrk->pending_event_vector;
vec_foreach (evt, pending_event_vector)
{
found = session_node_cmp_event (evt, f);
if (found)
{
clib_memcpy_fast (e, evt, sizeof (*evt));
break;
}
}
return found;
}
static clib_error_t *
session_queue_exit (vlib_main_t * vm)
{
if (vec_len (vlib_mains) < 2)
return 0;
/*
* Shut off (especially) worker-thread session nodes.
* Otherwise, vpp can crash as the main thread unmaps the
* API segment.
*/
vlib_worker_thread_barrier_sync (vm);
session_node_enable_disable (0 /* is_enable */ );
vlib_worker_thread_barrier_release (vm);
return 0;
}
VLIB_MAIN_LOOP_EXIT_FUNCTION (session_queue_exit);
static uword
session_queue_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
vlib_frame_t * f)
{
f64 now, timeout = 1.0;
uword *event_data = 0;
uword event_type;
while (1)
{
vlib_process_wait_for_event_or_clock (vm, timeout);
now = vlib_time_now (vm);
event_type = vlib_process_get_events (vm, (uword **) & event_data);
switch (event_type)
{
case SESSION_Q_PROCESS_FLUSH_FRAMES:
/* Flush the frames by updating all transports times */
transport_update_time (now, 0);
break;
case SESSION_Q_PROCESS_STOP:
timeout = 100000.0;
break;
case ~0:
/* Timed out. Update time for all transports to trigger all
* outstanding retransmits. */
transport_update_time (now, 0);
break;
}
vec_reset_length (event_data);
}
return 0;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (session_queue_process_node) =
{
.function = session_queue_process,
.type = VLIB_NODE_TYPE_PROCESS,
.name = "session-queue-process",
.state = VLIB_NODE_STATE_DISABLED,
};
/* *INDENT-ON* */
static_always_inline uword
session_queue_pre_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
session_main_t *sm = &session_main;
if (!sm->wrk[0].vpp_event_queue)
return 0;
return session_queue_node_fn (vm, node, frame);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (session_queue_pre_input_node) =
{
.function = session_queue_pre_input_inline,
.type = VLIB_NODE_TYPE_PRE_INPUT,
.name = "session-queue-main",
.state = VLIB_NODE_STATE_DISABLED,
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/