CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
tcp_tx_trace_t *t = va_arg (*args, tcp_tx_trace_t *);
+ tcp_connection_t *tc = &t->tcp_connection;
u32 indent = format_get_indent (s);
- s = format (s, "%U\n%U%U",
- format_tcp_header, &t->tcp_header, 128,
- format_white_space, indent,
- format_tcp_connection, &t->tcp_connection, 1);
+ s = format (s, "%U state %U\n%U%U", format_tcp_connection_id, tc,
+ format_tcp_state, tc->state, format_white_space, indent,
+ format_tcp_header, &t->tcp_header, 128);
return s;
}
return wnd_scale;
}
-/**
- * Update max segment size we're able to process.
- *
- * The value is constrained by our interface's MTU and IP options. It is
- * also what we advertise to our peer.
- */
-void
-tcp_update_rcv_mss (tcp_connection_t * tc)
-{
- /* TODO find our iface MTU */
- tc->mss = tcp_main.default_mtu - sizeof (tcp_header_t);
-}
-
/**
* TCP's initial window
*/
tcp_update_rcv_mss (tc);
TCP_IW_N_SEGMENTS * tc->mss;
*/
- return TCP_MIN_RX_FIFO_SIZE;
+ return tcp_cfg.min_rx_fifo;
}
/**
u32
tcp_initial_window_to_advertise (tcp_connection_t * tc)
{
- tcp_main_t *tm = &tcp_main;
- u32 max_fifo;
-
- /* Initial wnd for SYN. Fifos are not allocated yet.
- * Use some predefined value. For SYN-ACK we still want the
- * scale to be computed in the same way */
- max_fifo = tm->max_rx_fifo ? tm->max_rx_fifo : TCP_MAX_RX_FIFO_SIZE;
-
/* Compute rcv wscale only if peer advertised support for it */
if (tc->state != TCP_STATE_SYN_RCVD || tcp_opts_wscale (&tc->rcv_opts))
- tc->rcv_wscale = tcp_window_compute_scale (max_fifo);
+ tc->rcv_wscale = tcp_window_compute_scale (tcp_cfg.max_rx_fifo);
tc->rcv_wnd = tcp_initial_wnd_unscaled (tc);
u32 available_space, wnd;
i32 observed_wnd;
- ASSERT (tc->rcv_opts.mss < transport_rx_fifo_size (&tc->connection));
-
/*
* Figure out how much space we have available
*/
available_space = transport_max_rx_enqueue (&tc->connection);
if (PREDICT_FALSE (available_space < tc->rcv_opts.mss))
- available_space = 0;
+ {
+ tc->rcv_wnd = 0;
+ return;
+ }
/*
* Use the above and what we know about what we've previously advertised
if (PREDICT_FALSE ((i32) available_space < observed_wnd))
{
wnd = clib_max (observed_wnd, 0);
- TCP_EVT_DBG (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space);
+ TCP_EVT (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space);
}
else
{
}
static int
-tcp_make_syn_options (tcp_options_t * opts, u8 wnd_scale)
+tcp_make_syn_options (tcp_connection_t * tc, tcp_options_t * opts)
{
u8 len = 0;
opts->flags |= TCP_OPTS_FLAG_MSS;
- opts->mss = tcp_main.default_mtu; /*XXX discover that */
+ opts->mss = tc->mss;
len += TCP_OPTION_LEN_MSS;
opts->flags |= TCP_OPTS_FLAG_WSCALE;
- opts->wscale = wnd_scale;
+ opts->wscale = tc->rcv_wscale;
len += TCP_OPTION_LEN_WINDOW_SCALE;
opts->flags |= TCP_OPTS_FLAG_TSTAMP;
case TCP_STATE_SYN_RCVD:
return tcp_make_synack_options (tc, opts);
case TCP_STATE_SYN_SENT:
- return tcp_make_syn_options (opts, tc->rcv_wscale);
+ return tcp_make_syn_options (tc, opts);
default:
clib_warning ("State not handled! %d", state);
return 0;
tcp_update_rcv_wnd (tc);
- if (tc->flags & TCP_CONN_RATE_SAMPLE)
- tc->flags |= TCP_CONN_TRACK_BURST;
+ if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
+ tcp_bt_check_app_limited (tc);
if (tc->snd_una == tc->snd_nxt)
- tcp_cc_event (tc, TCP_CC_EVT_START_TX);
-}
-
-void
-tcp_init_mss (tcp_connection_t * tc)
-{
- u16 default_min_mss = 536;
- tcp_update_rcv_mss (tc);
-
- /* TODO cache mss and consider PMTU discovery */
- tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
-
- if (tc->snd_mss < 45)
{
- /* Assume that at least the min default mss works */
- tc->snd_mss = default_min_mss;
- tc->rcv_opts.mss = default_min_mss;
+ tcp_cc_event (tc, TCP_CC_EVT_START_TX);
+ tcp_connection_tx_pacer_reset (tc, tc->cwnd, TRANSPORT_PACER_MIN_BURST);
}
-
- /* We should have enough space for 40 bytes of options */
- ASSERT (tc->snd_mss > 45);
-
- /* If we use timestamp option, account for it */
- if (tcp_opts_tstamp (&tc->rcv_opts))
- tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
}
+
#endif /* CLIB_MARCH_VARIANT */
static void *
return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
}
+
+/* Compute TCP checksum in software when offloading is disabled for a connection */
+u16
+ip6_tcp_compute_checksum_custom (vlib_main_t * vm, vlib_buffer_t * p0,
+ ip46_address_t * src, ip46_address_t * dst)
+{
+ ip_csum_t sum0;
+ u16 payload_length_host_byte_order;
+ u32 i;
+
+ /* Initialize checksum with ip header. */
+ sum0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, p0)) +
+ clib_host_to_net_u16 (IP_PROTOCOL_TCP);
+ payload_length_host_byte_order = vlib_buffer_length_in_chain (vm, p0);
+
+ for (i = 0; i < ARRAY_LEN (src->ip6.as_uword); i++)
+ {
+ sum0 = ip_csum_with_carry
+ (sum0, clib_mem_unaligned (&src->ip6.as_uword[i], uword));
+ sum0 = ip_csum_with_carry
+ (sum0, clib_mem_unaligned (&dst->ip6.as_uword[i], uword));
+ }
+
+ return ip_calculate_l4_checksum (vm, p0, sum0,
+ payload_length_host_byte_order, NULL, 0,
+ NULL);
+}
+
+u16
+ip4_tcp_compute_checksum_custom (vlib_main_t * vm, vlib_buffer_t * p0,
+ ip46_address_t * src, ip46_address_t * dst)
+{
+ ip_csum_t sum0;
+ u32 payload_length_host_byte_order;
+
+ payload_length_host_byte_order = vlib_buffer_length_in_chain (vm, p0);
+ sum0 =
+ clib_host_to_net_u32 (payload_length_host_byte_order +
+ (IP_PROTOCOL_TCP << 16));
+
+ sum0 = ip_csum_with_carry (sum0, clib_mem_unaligned (&src->ip4, u32));
+ sum0 = ip_csum_with_carry (sum0, clib_mem_unaligned (&dst->ip4, u32));
+
+ return ip_calculate_l4_checksum (vm, p0, sum0,
+ payload_length_host_byte_order, NULL, 0,
+ NULL);
+}
+
+static inline u16
+tcp_compute_checksum (tcp_connection_t * tc, vlib_buffer_t * b)
+{
+ u16 checksum = 0;
+ if (PREDICT_FALSE (tc->cfg_flags & TCP_CFG_F_NO_CSUM_OFFLOAD))
+ {
+ tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
+ vlib_main_t *vm = wrk->vm;
+
+ if (tc->c_is_ip4)
+ checksum = ip4_tcp_compute_checksum_custom
+ (vm, b, &tc->c_lcl_ip, &tc->c_rmt_ip);
+ else
+ checksum = ip6_tcp_compute_checksum_custom
+ (vm, b, &tc->c_lcl_ip, &tc->c_rmt_ip);
+ }
+ else
+ {
+ b->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
+ }
+ return checksum;
+}
+
/**
* Prepare ACK
*/
tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
tcp_options_write ((u8 *) (th + 1), snd_opts);
+
+ th->checksum = tcp_compute_checksum (tc, b);
+
vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
if (wnd == 0)
tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
{
tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
- TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
+ TCP_EVT (TCP_EVT_ACK_SENT, tc);
tc->rcv_las = tc->rcv_nxt;
}
/* Make and write options */
clib_memset (&snd_opts, 0, sizeof (snd_opts));
- tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
+ tcp_opts_len = tcp_make_syn_options (tc, &snd_opts);
tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
initial_wnd);
vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
tcp_options_write ((u8 *) (th + 1), &snd_opts);
+ th->checksum = tcp_compute_checksum (tc, b);
}
/**
tcp_options_write ((u8 *) (th + 1), snd_opts);
vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
+ th->checksum = tcp_compute_checksum (tc, b);
}
always_inline void
session_flush_frames_main_thread (wrk->vm);
}
-always_inline void
-tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
- u8 is_ip4, u8 flush)
+static void
+tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
+ u8 is_ip4)
{
- u32 *to_next, next_index;
- vlib_frame_t *f;
+ session_type_t st;
b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
b->error = 0;
- /* Decide where to send the packet */
- next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
- tcp_trajectory_add_start (b, 2);
-
- /* Get frame to v4/6 output node */
- f = wrk->tx_frames[!is_ip4];
- if (!f)
- {
- f = vlib_get_frame_to_node (wrk->vm, next_index);
- ASSERT (f);
- wrk->tx_frames[!is_ip4] = f;
- }
- to_next = vlib_frame_vector_args (f);
- to_next[f->n_vectors] = bi;
- f->n_vectors += 1;
- if (flush || f->n_vectors == VLIB_FRAME_SIZE)
- {
- vlib_put_frame_to_node (wrk->vm, next_index, f);
- wrk->tx_frames[!is_ip4] = 0;
- }
-}
-
-static void
-tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
- u8 is_ip4)
-{
- tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0);
+ st = session_type_from_proto_and_ip (TRANSPORT_PROTO_TCP, is_ip4);
+ session_add_pending_tx_buffer (st, wrk->vm->thread_index, bi);
}
-static void
-tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
- u8 is_ip4)
-{
- tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1);
-}
#endif /* CLIB_MARCH_VARIANT */
static int
-tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
- tcp_state_t state, u8 thread_index, u8 is_ip4)
+tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b, u8 is_ip4)
{
ip4_header_t *ih4;
ip6_header_t *ih6;
- tcp_header_t *th0;
- ip4_address_t src_ip40, dst_ip40;
- ip6_address_t src_ip60, dst_ip60;
+ tcp_header_t *th;
+ ip4_address_t src_ip4, dst_ip4;
+ ip6_address_t src_ip6, dst_ip6;
u16 src_port, dst_port;
- u32 tmp;
- u32 seq, ack;
+ u32 tmp, len, seq, ack;
u8 flags;
/* Find IP and TCP headers */
- th0 = tcp_buffer_hdr (b0);
+ th = tcp_buffer_hdr (b);
/* Save src and dst ip */
if (is_ip4)
{
- ih4 = vlib_buffer_get_current (b0);
+ ih4 = vlib_buffer_get_current (b);
ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40);
- src_ip40.as_u32 = ih4->src_address.as_u32;
- dst_ip40.as_u32 = ih4->dst_address.as_u32;
+ src_ip4.as_u32 = ih4->src_address.as_u32;
+ dst_ip4.as_u32 = ih4->dst_address.as_u32;
}
else
{
- ih6 = vlib_buffer_get_current (b0);
+ ih6 = vlib_buffer_get_current (b);
ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60);
- clib_memcpy_fast (&src_ip60, &ih6->src_address, sizeof (ip6_address_t));
- clib_memcpy_fast (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t));
+ clib_memcpy_fast (&src_ip6, &ih6->src_address, sizeof (ip6_address_t));
+ clib_memcpy_fast (&dst_ip6, &ih6->dst_address, sizeof (ip6_address_t));
}
- src_port = th0->src_port;
- dst_port = th0->dst_port;
+ src_port = th->src_port;
+ dst_port = th->dst_port;
+ flags = TCP_FLAG_RST;
- /* Try to determine what/why we're actually resetting */
- if (state == TCP_STATE_CLOSED)
+ /*
+ * RFC 793. If the ACK bit is off, sequence number zero is used,
+ * <SEQ=0><ACK=SEG.SEQ+SEG.LEN><CTL=RST,ACK>
+ * If the ACK bit is on,
+ * <SEQ=SEG.ACK><CTL=RST>
+ */
+ if (tcp_ack (th))
{
- if (!tcp_syn (th0))
- return -1;
-
- tmp = clib_net_to_host_u32 (th0->seq_number);
-
- /* Got a SYN for no listener. */
- flags = TCP_FLAG_RST | TCP_FLAG_ACK;
- ack = clib_host_to_net_u32 (tmp + 1);
- seq = 0;
+ seq = th->ack_number;
+ ack = 0;
}
else
{
- flags = TCP_FLAG_RST;
- seq = th0->ack_number;
- ack = 0;
+ flags |= TCP_FLAG_ACK;
+ tmp = clib_net_to_host_u32 (th->seq_number);
+ len = vnet_buffer (b)->tcp.data_len + tcp_is_syn (th) + tcp_is_fin (th);
+ ack = clib_host_to_net_u32 (tmp + len);
+ seq = 0;
}
- tcp_reuse_buffer (vm, b0);
- tcp_trajectory_add_start (b0, 4);
- th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
- sizeof (tcp_header_t), flags, 0);
+ tcp_reuse_buffer (vm, b);
+ tcp_trajectory_add_start (b, 4);
+ th = vlib_buffer_push_tcp_net_order (b, dst_port, src_port, seq, ack,
+ sizeof (tcp_header_t), flags, 0);
if (is_ip4)
{
- ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
+ ih4 = vlib_buffer_push_ip4 (vm, b, &dst_ip4, &src_ip4,
IP_PROTOCOL_TCP, 1);
- th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
+ th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
}
else
{
int bogus = ~0;
- ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60,
- IP_PROTOCOL_TCP);
- th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus);
+ ih6 = vlib_buffer_push_ip6 (vm, b, &dst_ip6, &src_ip6, IP_PROTOCOL_TCP);
+ th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
ASSERT (!bogus);
}
{
ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
- &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
+ &pkt_ih4->src_address, IP_PROTOCOL_TCP,
+ tcp_csum_offload (tc));
th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
}
else
int bogus = ~0;
ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
0x60);
- ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
- &pkt_ih6->src_address, IP_PROTOCOL_TCP);
+ ih6 = vlib_buffer_push_ip6_custom (vm, b, &pkt_ih6->dst_address,
+ &pkt_ih6->src_address,
+ IP_PROTOCOL_TCP,
+ tc->ipv6_flow_label);
th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
ASSERT (!bogus);
}
tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index);
- TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
+ TCP_EVT (TCP_EVT_RST_SENT, tc);
vlib_node_increment_counter (vm, tcp_node_index (output, tc->c_is_ip4),
TCP_ERROR_RST_SENT, 1);
}
tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
- advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
+ advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale;
flags = TCP_FLAG_RST;
th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
tc->rcv_nxt, tcp_hdr_opts_len, flags,
advertise_wnd);
opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
+ th->checksum = tcp_compute_checksum (tc, b);
ASSERT (opts_write_len == tc->snd_opts_len);
vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
- if (tc->c_is_ip4)
- {
- ip4_header_t *ih4;
- ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
- &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
- th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
- }
- else
- {
- int bogus = ~0;
- ip6_header_t *ih6;
- ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
- &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
- th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
- ASSERT (!bogus);
- }
- tcp_enqueue_to_ip_lookup_now (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
- TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
+ tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
+ TCP_EVT (TCP_EVT_RST_SENT, tc);
vlib_node_increment_counter (vm, tcp_node_index (output, tc->c_is_ip4),
TCP_ERROR_RST_SENT, 1);
}
tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
vlib_buffer_t * b)
{
- tcp_header_t *th = vlib_buffer_get_current (b);
- vlib_main_t *vm = wrk->vm;
if (tc->c_is_ip4)
{
- ip4_header_t *ih;
- ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
- &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
- th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
+ vlib_buffer_push_ip4 (wrk->vm, b, &tc->c_lcl_ip4, &tc->c_rmt_ip4,
+ IP_PROTOCOL_TCP, tcp_csum_offload (tc));
}
else
{
- ip6_header_t *ih;
- int bogus = ~0;
-
- ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
- &tc->c_rmt_ip6, IP_PROTOCOL_TCP);
- th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
- ASSERT (!bogus);
+ vlib_buffer_push_ip6_custom (wrk->vm, b, &tc->c_lcl_ip6, &tc->c_rmt_ip6,
+ IP_PROTOCOL_TCP, tc->ipv6_flow_label);
}
}
* Setup retransmit and establish timers before requesting buffer
* such that we can return if we've ran out.
*/
- tcp_timer_set (tc, TCP_TIMER_ESTABLISH_AO, TCP_ESTABLISH_TIME);
tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
tc->rto * TCP_TO_TIMER_TICK);
tcp_push_ip_hdr (wrk, tc, b);
tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
- TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
+ TCP_EVT (TCP_EVT_SYN_SENT, tc);
}
void
tcp_init_buffer (vm, b);
tcp_make_synack (tc, b);
tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
- TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
-}
-
-/**
- * Flush tx frame populated by retransmits and timer pops
- */
-void
-tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4)
-{
- if (wrk->tx_frames[!is_ip4])
- {
- u32 next_index;
- next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
- vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]);
- wrk->tx_frames[!is_ip4] = 0;
- }
-}
-
-/**
- * Flush ip lookup tx frames populated by timer pops
- */
-static void
-tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4)
-{
- if (wrk->ip_lookup_tx_frames[!is_ip4])
- {
- u32 next_index;
- next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
- vlib_put_frame_to_node (wrk->vm, next_index,
- wrk->ip_lookup_tx_frames[!is_ip4]);
- wrk->ip_lookup_tx_frames[!is_ip4] = 0;
- }
-}
-
-/**
- * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
- */
-void
-tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk)
-{
- tcp_flush_frame_to_output (wrk, 1);
- tcp_flush_frame_to_output (wrk, 0);
- tcp_flush_frame_to_ip_lookup (wrk, 1);
- tcp_flush_frame_to_ip_lookup (wrk, 0);
+ TCP_EVT (TCP_EVT_SYNACK_SENT, tc);
}
/**
return;
}
+ /* If we have non-dupacks programmed, no need to send them */
+ if ((tc->flags & TCP_CONN_SNDACK) && !tc->pending_dupacks)
+ tc->flags &= ~TCP_CONN_SNDACK;
+
tcp_retransmit_timer_force_update (tc);
b = vlib_get_buffer (vm, bi);
tcp_init_buffer (vm, b);
tcp_make_fin (tc, b);
- tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4);
- TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
+ tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
+ TCP_EVT (TCP_EVT_FIN_SENT, tc);
/* Account for the FIN */
tc->snd_nxt += 1;
if (!fin_snt)
tc->snd_nxt += data_len;
tc->rcv_las = tc->rcv_nxt;
- TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
+ tc->bytes_out += data_len;
+ tc->data_segs_out += 1;
+
+ th->checksum = tcp_compute_checksum (tc, b);
+
+ TCP_EVT (TCP_EVT_PKTIZE, tc);
+}
+
+always_inline u32
+tcp_buffer_len (vlib_buffer_t * b)
+{
+ u32 data_len = b->current_length;
+ if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
+ data_len += b->total_length_not_including_first_buffer;
+ return data_len;
}
u32
{
tcp_connection_t *tc = (tcp_connection_t *) tconn;
- if (tc->flags & TCP_CONN_TRACK_BURST)
- {
- tcp_bt_check_app_limited (tc);
- tcp_bt_track_tx (tc);
- tc->flags &= ~TCP_CONN_TRACK_BURST;
- }
+ if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
+ tcp_bt_track_tx (tc, tcp_buffer_len (b));
tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0, /* burst */ 1,
/* update_snd_nxt */ 1);
}
void
-tcp_program_fastretransmit (tcp_connection_t * tc)
+tcp_program_retransmit (tcp_connection_t * tc)
{
- if (!(tc->flags & TCP_CONN_FRXT_PENDING))
+ if (!(tc->flags & TCP_CONN_RXT_PENDING))
{
session_add_self_custom_tx_evt (&tc->connection, 0);
- tc->flags |= TCP_CONN_FRXT_PENDING;
+ tc->flags |= TCP_CONN_RXT_PENDING;
}
}
* Sends delayed ACK when timer expires
*/
void
-tcp_timer_delack_handler (u32 index)
+tcp_timer_delack_handler (tcp_connection_t * tc)
{
- u32 thread_index = vlib_get_thread_index ();
- tcp_connection_t *tc;
-
- tc = tcp_connection_get (index, thread_index);
- tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
tcp_send_ack (tc);
}
/**
- * Send Window Update ACK,
- * ensuring that it will be sent once, if RWND became non-zero,
- * after zero RWND has been advertised in ACK before
+ * Send window update ack
+ *
+ * Ensures that it will be sent only once, after a zero rwnd has been
+ * advertised in a previous ack, and only if rwnd has grown beyond a
+ * configurable value.
*/
void
tcp_send_window_update_ack (tcp_connection_t * tc)
{
- u32 win;
-
if (tcp_zero_rwnd_sent (tc))
{
- win = tcp_window_to_advertise (tc, tc->state);
- if (win > 0)
+ tcp_update_rcv_wnd (tc);
+ if (tc->rcv_wnd >= tcp_cfg.rwnd_min_update_ack * tc->snd_mss)
{
tcp_zero_rwnd_sent_off (tc);
tcp_program_ack (tc);
max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
- /* Start is beyond snd_congestion */
start = tc->snd_una + offset;
- if (seq_geq (start, tc->snd_congestion))
- goto done;
-
- /* Don't overshoot snd_congestion */
- if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
- {
- max_deq_bytes = tc->snd_congestion - start;
- if (max_deq_bytes == 0)
- goto done;
- }
+ ASSERT (seq_leq (start + max_deq_bytes, tc->snd_nxt));
n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b);
if (!n_bytes)
return 0;
- if (tcp_in_fastrecovery (tc))
- {
- tc->snd_rxt_bytes += n_bytes;
- if (tc->flags & TCP_CONN_RATE_SAMPLE)
- tcp_bt_track_rxt (tc, start, start + n_bytes);
- }
+ tc->snd_rxt_bytes += n_bytes;
+
+ if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
+ tcp_bt_track_rxt (tc, start, start + n_bytes);
+
+ tc->bytes_retrans += n_bytes;
+ tc->segs_retrans += 1;
+ tcp_workerp_stats_inc (wrk, rxt_segs, 1);
+ TCP_EVT (TCP_EVT_CC_RTX, tc, offset, n_bytes);
-done:
- TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
return n_bytes;
}
+static void
+tcp_check_sack_reneging (tcp_connection_t * tc)
+{
+ sack_scoreboard_t *sb = &tc->sack_sb;
+ sack_scoreboard_hole_t *hole;
+
+ hole = scoreboard_first_hole (sb);
+ if (!sb->is_reneging && (!hole || hole->start == tc->snd_una))
+ return;
+
+ scoreboard_clear_reneging (sb, tc->snd_una, tc->snd_nxt);
+}
+
/**
* Reset congestion control, switch cwnd to loss window and try again.
*/
static void
tcp_cc_init_rxt_timeout (tcp_connection_t * tc)
{
- TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6);
+ TCP_EVT (TCP_EVT_CC_EVT, tc, 6);
+
tc->prev_ssthresh = tc->ssthresh;
tc->prev_cwnd = tc->cwnd;
- /* Clear fast recovery state if needed */
- if (tcp_in_fastrecovery (tc))
- tcp_cc_fastrecovery_clear (tc);
+ /* If we entrered loss without fast recovery, notify cc algo of the
+ * congestion event such that it can update ssthresh and its state */
+ if (!tcp_in_fastrecovery (tc))
+ tcp_cc_congestion (tc);
- /* Let cc algo decide loss cwnd and ssthresh */
+ /* Let cc algo decide loss cwnd and ssthresh post unrecovered loss */
tcp_cc_loss (tc);
- /* Start again from the beginning */
- tc->snd_congestion = tc->snd_nxt;
- tc->rcv_dupacks = 0;
tc->rtt_ts = 0;
tc->cwnd_acc_bytes = 0;
- tcp_connection_tx_pacer_reset (tc, tc->cwnd, 2 * tc->snd_mss);
+ tc->tr_occurences += 1;
tcp_recovery_on (tc);
}
-static inline void
-tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
+void
+tcp_timer_retransmit_handler (tcp_connection_t * tc)
{
- u32 thread_index = vlib_get_thread_index ();
- tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
+ tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
vlib_main_t *vm = wrk->vm;
- tcp_connection_t *tc;
vlib_buffer_t *b = 0;
u32 bi, n_bytes;
- if (is_syn)
- {
- tc = tcp_half_open_connection_get (index);
- /* Note: the connection may have transitioned to ESTABLISHED... */
- if (PREDICT_FALSE (tc == 0 || tc->state != TCP_STATE_SYN_SENT))
- return;
- tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
- }
- else
- {
- tc = tcp_connection_get (index, thread_index);
- /* Note: the connection may have been closed and pool_put */
- if (PREDICT_FALSE (tc == 0 || tc->state == TCP_STATE_SYN_SENT))
- return;
- tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
- /* Wait-close and retransmit could pop at the same time */
- if (tc->state == TCP_STATE_CLOSED)
- return;
- }
+ tcp_workerp_stats_inc (wrk, tr_events, 1);
+
+ /* Should be handled by a different handler */
+ if (PREDICT_FALSE (tc->state == TCP_STATE_SYN_SENT))
+ return;
+
+ /* Wait-close and retransmit could pop at the same time */
+ if (tc->state == TCP_STATE_CLOSED)
+ return;
if (tc->state >= TCP_STATE_ESTABLISHED)
{
- TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
+ TCP_EVT (TCP_EVT_CC_EVT, tc, 2);
/* Lost FIN, retransmit and return */
if (tc->flags & TCP_CONN_FINSNT)
tcp_send_reset (tc);
tcp_connection_set_state (tc, TCP_STATE_CLOSED);
session_transport_closing_notify (&tc->connection);
+ session_transport_closed_notify (&tc->connection);
tcp_connection_timers_reset (tc);
- tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME);
+ tcp_program_cleanup (wrk, tc);
+ tcp_workerp_stats_inc (wrk, tr_abort, 1);
return;
}
- /* Increment RTO backoff (also equal to number of retries) and go back
- * to first un-acked byte */
- tc->rto_boff += 1;
+ if (tcp_opts_sack_permitted (&tc->rcv_opts))
+ tcp_check_sack_reneging (tc);
- /* TODO be less aggressive about clearing scoreboard */
- scoreboard_clear (&tc->sack_sb);
-
- /* First retransmit timeout */
- if (tc->rto_boff == 1)
- tcp_cc_init_rxt_timeout (tc);
-
- if (tc->flags & TCP_CONN_RATE_SAMPLE)
- tcp_bt_flush_samples (tc);
-
- /* If we've sent beyond snd_congestion, update it */
- tc->snd_congestion = seq_max (tc->snd_nxt, tc->snd_congestion);
-
- tc->snd_nxt = tc->snd_una;
- tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
+ /* Update send congestion to make sure that rxt has data to send */
+ tc->snd_congestion = tc->snd_nxt;
- /* Send one segment. Note that n_bytes may be zero due to buffer
- * shortfall */
- n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
+ /* Send the first unacked segment. If we're short on buffers, return
+ * as soon as possible */
+ n_bytes = clib_min (tc->snd_mss, tc->snd_nxt - tc->snd_una);
+ n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, n_bytes, &b);
if (!n_bytes)
{
tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
}
bi = vlib_get_buffer_index (vm, b);
-
- /* For first retransmit, record timestamp (Eifel detection RFC3522) */
- if (tc->rto_boff == 1)
- tc->snd_rxt_ts = tcp_tstamp (tc);
-
tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
- tcp_retransmit_timer_force_update (tc);
- }
- /* Retransmit for SYN */
- else if (tc->state == TCP_STATE_SYN_SENT)
- {
- /* Half-open connection actually moved to established but we were
- * waiting for syn retransmit to pop to call cleanup from the right
- * thread. */
- if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
- {
- if (tcp_half_open_connection_cleanup (tc))
- TCP_DBG ("could not remove half-open connection");
- return;
- }
- TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
+ tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
+ tcp_retransmit_timer_force_update (tc);
- /* Try without increasing RTO a number of times. If this fails,
- * start growing RTO exponentially */
tc->rto_boff += 1;
- if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
- tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
-
- tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
- tc->rto * TCP_TO_TIMER_TICK);
-
- if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
+ if (tc->rto_boff == 1)
{
- tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
- return;
+ tcp_cc_init_rxt_timeout (tc);
+ /* Record timestamp. Eifel detection algorithm RFC3522 */
+ tc->snd_rxt_ts = tcp_tstamp (tc);
}
- b = vlib_get_buffer (vm, bi);
- tcp_init_buffer (vm, b);
- tcp_make_syn (tc, b);
+ if (tcp_opts_sack_permitted (&tc->rcv_opts))
+ scoreboard_init_rxt (&tc->sack_sb, tc->snd_una + n_bytes);
- tc->rtt_ts = 0;
- TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
-
- /* This goes straight to ipx_lookup. Retransmit timer set already */
- tcp_push_ip_hdr (wrk, tc, b);
- tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
+ tcp_program_retransmit (tc);
}
/* Retransmit SYN-ACK */
else if (tc->state == TCP_STATE_SYN_RCVD)
{
- TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
+ TCP_EVT (TCP_EVT_CC_EVT, tc, 2);
- tc->rto_boff += 1;
- if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
- tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
tc->rtt_ts = 0;
- tcp_retransmit_timer_force_update (tc);
+ /* Passive open establish timeout */
+ if (tc->rto > TCP_ESTABLISH_TIME >> 1)
+ {
+ tcp_connection_set_state (tc, TCP_STATE_CLOSED);
+ tcp_connection_timers_reset (tc);
+ tcp_program_cleanup (wrk, tc);
+ tcp_workerp_stats_inc (wrk, tr_abort, 1);
+ return;
+ }
if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
{
return;
}
+ tc->rto_boff += 1;
+ if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
+ tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
+
+ tcp_retransmit_timer_force_update (tc);
+
b = vlib_get_buffer (vm, bi);
tcp_init_buffer (vm, b);
tcp_make_synack (tc, b);
- TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
+ TCP_EVT (TCP_EVT_SYN_RXT, tc, 1);
/* Retransmit timer already updated, just enqueue to output */
tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
}
}
+/**
+ * SYN retransmit timer handler. Active open only.
+ */
void
-tcp_timer_retransmit_handler (u32 index)
+tcp_timer_retransmit_syn_handler (tcp_connection_t * tc)
{
- tcp_timer_retransmit_handler_i (index, 0);
-}
+ tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
+ vlib_main_t *vm = wrk->vm;
+ vlib_buffer_t *b = 0;
+ u32 bi;
-void
-tcp_timer_retransmit_syn_handler (u32 index)
-{
- tcp_timer_retransmit_handler_i (index, 1);
+ /* Note: the connection may have transitioned to ESTABLISHED... */
+ if (PREDICT_FALSE (tc->state != TCP_STATE_SYN_SENT))
+ return;
+
+ /* Half-open connection actually moved to established but we were
+ * waiting for syn retransmit to pop to call cleanup from the right
+ * thread. */
+ if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
+ {
+ if (tcp_half_open_connection_cleanup (tc))
+ TCP_DBG ("could not remove half-open connection");
+ return;
+ }
+
+ TCP_EVT (TCP_EVT_CC_EVT, tc, 2);
+ tc->rtt_ts = 0;
+
+ /* Active open establish timeout */
+ if (tc->rto >= TCP_ESTABLISH_TIME >> 1)
+ {
+ session_stream_connect_notify (&tc->connection, 1 /* fail */ );
+ tcp_connection_cleanup (tc);
+ return;
+ }
+
+ if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1)))
+ {
+ tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1);
+ return;
+ }
+
+ /* Try without increasing RTO a number of times. If this fails,
+ * start growing RTO exponentially */
+ tc->rto_boff += 1;
+ if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
+ tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
+
+ b = vlib_get_buffer (vm, bi);
+ tcp_init_buffer (vm, b);
+ tcp_make_syn (tc, b);
+
+ TCP_EVT (TCP_EVT_SYN_RXT, tc, 0);
+
+ /* This goes straight to ipx_lookup */
+ tcp_push_ip_hdr (wrk, tc, b);
+ tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index);
+
+ tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
+ tc->rto * TCP_TO_TIMER_TICK);
}
/**
*
*/
void
-tcp_timer_persist_handler (u32 index)
+tcp_timer_persist_handler (tcp_connection_t * tc)
{
- u32 thread_index = vlib_get_thread_index ();
- tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
+ tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
u32 bi, max_snd_bytes, available_bytes, offset;
tcp_main_t *tm = vnet_get_tcp_main ();
vlib_main_t *vm = wrk->vm;
- tcp_connection_t *tc;
vlib_buffer_t *b;
int n_bytes = 0;
u8 *data;
- tc = tcp_connection_get_if_valid (index, thread_index);
- if (!tc)
- return;
-
- /* Make sure timer handle is set to invalid */
- tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
-
/* Problem already solved or worse */
if (tc->state == TCP_STATE_CLOSED || tc->snd_wnd > tc->snd_mss
|| (tc->flags & TCP_CONN_FINSNT))
- return;
+ goto update_scheduler;
available_bytes = transport_max_tx_dequeue (&tc->connection);
offset = tc->snd_nxt - tc->snd_una;
}
if (available_bytes <= offset)
- {
- ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
- return;
- }
+ goto update_scheduler;
/* Increment RTO backoff */
tc->rto_boff += 1;
tcp_persist_timer_set (tc);
return;
}
+
b = vlib_get_buffer (vm, bi);
data = tcp_init_buffer (vm, b);
|| tc->snd_nxt == tc->snd_una_max
|| tc->rto_boff > 1));
+ if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
+ {
+ tcp_bt_check_app_limited (tc);
+ tcp_bt_track_tx (tc, n_bytes);
+ }
+
tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0,
/* burst */ 0, /* update_snd_nxt */ 1);
tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
/* Just sent new data, enable retransmit */
tcp_retransmit_timer_update (tc);
+
+ return;
+
+update_scheduler:
+
+ if (tcp_is_descheduled (tc))
+ transport_connection_reschedule (&tc->connection);
}
/**
vlib_buffer_t *b;
u32 bi, n_bytes;
- TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
+ TCP_EVT (TCP_EVT_CC_EVT, tc, 1);
n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
if (!n_bytes)
}
static int
-tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
- u32 burst_size)
+tcp_transmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
+ u32 burst_size)
{
u32 offset, n_segs = 0, n_written, bi, available_wnd;
vlib_main_t *vm = wrk->vm;
available_wnd = tc->snd_wnd - offset;
burst_size = clib_min (burst_size, available_wnd / tc->snd_mss);
+ if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
+ tcp_bt_check_app_limited (tc);
+
while (n_segs < burst_size)
{
n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b);
offset += n_written;
n_segs += 1;
+ if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
+ tcp_bt_track_tx (tc, n_written);
+
tc->snd_nxt += n_written;
tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
}
return n_segs;
}
+/**
+ * Estimate send space using proportional rate reduction (RFC6937)
+ */
+int
+tcp_fastrecovery_prr_snd_space (tcp_connection_t * tc)
+{
+ u32 pipe, prr_out;
+ int space;
+
+ pipe = tcp_flight_size (tc);
+ prr_out = tc->snd_rxt_bytes + (tc->snd_nxt - tc->snd_congestion);
+
+ if (pipe > tc->ssthresh)
+ {
+ space = ((int) tc->prr_delivered * ((f64) tc->ssthresh / tc->prev_cwnd))
+ - prr_out;
+ }
+ else
+ {
+ int limit;
+ limit = clib_max ((int) (tc->prr_delivered - prr_out), 0) + tc->snd_mss;
+ space = clib_min (tc->ssthresh - pipe, limit);
+ }
+ space = clib_max (space, prr_out ? 0 : tc->snd_mss);
+ return space;
+}
+
+static inline u8
+tcp_retransmit_should_retry_head (tcp_connection_t * tc,
+ sack_scoreboard_t * sb)
+{
+ u32 tx_adv_sack = sb->high_sacked - tc->snd_congestion;
+ f64 rr = (f64) tc->ssthresh / tc->prev_cwnd;
+
+ if (tcp_fastrecovery_first (tc))
+ return 1;
+
+ return (tx_adv_sack > (tc->snd_una - tc->prr_start) * rr);
+}
+
+static inline u8
+tcp_max_tx_deq (tcp_connection_t * tc)
+{
+ return (transport_max_tx_dequeue (&tc->connection)
+ - (tc->snd_nxt - tc->snd_una));
+}
+
#define scoreboard_rescue_rxt_valid(_sb, _tc) \
(seq_geq (_sb->rescue_rxt, _tc->snd_una) \
&& seq_leq (_sb->rescue_rxt, _tc->snd_congestion))
/**
- * Do fast retransmit with SACKs
+ * Do retransmit with SACKs
*/
-int
-tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
- u32 burst_size)
+static int
+tcp_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
+ u32 burst_size)
{
- u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now;
+ u32 n_written = 0, offset, max_bytes, n_segs = 0;
+ u8 snd_limited = 0, can_rescue = 0;
+ u32 bi, max_deq, burst_bytes;
sack_scoreboard_hole_t *hole;
vlib_main_t *vm = wrk->vm;
vlib_buffer_t *b = 0;
sack_scoreboard_t *sb;
- u32 bi, max_deq;
int snd_space;
- u8 snd_limited = 0, can_rescue = 0;
- ASSERT (tcp_in_fastrecovery (tc));
+ ASSERT (tcp_in_cong_recovery (tc));
- snd_space = tcp_available_cc_snd_space (tc);
- if (snd_space < tc->snd_mss)
+ burst_bytes = transport_connection_tx_pacer_burst (&tc->connection);
+ burst_size = clib_min (burst_size, burst_bytes / tc->snd_mss);
+ if (!burst_size)
{
- tcp_program_fastretransmit (tc);
+ tcp_program_retransmit (tc);
return 0;
}
- TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
+ if (tcp_in_recovery (tc))
+ snd_space = tcp_available_cc_snd_space (tc);
+ else
+ snd_space = tcp_fastrecovery_prr_snd_space (tc);
+
+ if (snd_space < tc->snd_mss)
+ goto done;
+
sb = &tc->sack_sb;
+
+ /* Check if snd_una is a lost retransmit */
+ if (pool_elts (sb->holes)
+ && seq_gt (sb->high_sacked, tc->snd_congestion)
+ && tc->rxt_head != tc->snd_una
+ && tcp_retransmit_should_retry_head (tc, sb))
+ {
+ max_bytes = clib_min (tc->snd_mss, tc->snd_congestion - tc->snd_una);
+ n_written = tcp_prepare_retransmit_segment (wrk, tc, 0, max_bytes, &b);
+ if (!n_written)
+ {
+ tcp_program_retransmit (tc);
+ goto done;
+ }
+ bi = vlib_get_buffer_index (vm, b);
+ tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
+ n_segs = 1;
+
+ tc->rxt_head = tc->snd_una;
+ tc->rxt_delivered += n_written;
+ tc->prr_delivered += n_written;
+ ASSERT (tc->rxt_delivered <= tc->snd_rxt_bytes);
+ }
+
+ tcp_fastrecovery_first_off (tc);
+
+ TCP_EVT (TCP_EVT_CC_EVT, tc, 0);
hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
max_deq = transport_max_tx_dequeue (&tc->connection);
while (snd_space > 0 && n_segs < burst_size)
{
- hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue,
+ hole = scoreboard_next_rxt_hole (sb, hole, max_deq != 0, &can_rescue,
&snd_limited);
if (!hole)
{
- if (max_deq)
+ /* We are out of lost holes to retransmit so send some new data. */
+ if (max_deq > tc->snd_mss)
{
+ u32 n_segs_new;
+ int av_wnd;
+
+ /* Make sure we don't exceed available window and leave space
+ * for one more packet, to avoid zero window acks */
+ av_wnd = (int) tc->snd_wnd - (tc->snd_nxt - tc->snd_una);
+ av_wnd = clib_max (av_wnd - tc->snd_mss, 0);
+ snd_space = clib_min (snd_space, av_wnd);
snd_space = clib_min (max_deq, snd_space);
burst_size = clib_min (burst_size - n_segs,
snd_space / tc->snd_mss);
- n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
- if (max_deq > n_segs_now * tc->snd_mss)
- tcp_program_fastretransmit (tc);
- n_segs += n_segs_now;
+ burst_size = clib_min (burst_size, TCP_RXT_MAX_BURST);
+ n_segs_new = tcp_transmit_unsent (wrk, tc, burst_size);
+ if (max_deq > n_segs_new * tc->snd_mss)
+ tcp_program_retransmit (tc);
+
+ n_segs += n_segs_new;
goto done;
}
- if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc))
+ if (tcp_in_recovery (tc) || !can_rescue
+ || scoreboard_rescue_rxt_valid (sb, tc))
break;
/* If rescue rxt undefined or less than snd_una then one segment of
* unSACKed sequence number SHOULD be returned, and RescueRxt set to
* RecoveryPoint. HighRxt MUST NOT be updated.
*/
- max_bytes = clib_min (tc->snd_mss,
- tc->snd_congestion - tc->snd_una);
+ hole = scoreboard_last_hole (sb);
+ max_bytes = clib_min (tc->snd_mss, hole->end - hole->start);
max_bytes = clib_min (max_bytes, snd_space);
- offset = tc->snd_congestion - tc->snd_una - max_bytes;
- sb->rescue_rxt = tc->snd_congestion;
+ offset = hole->end - tc->snd_una - max_bytes;
n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
max_bytes, &b);
if (!n_written)
goto done;
+ sb->rescue_rxt = tc->snd_congestion;
bi = vlib_get_buffer_index (vm, b);
tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
n_segs += 1;
tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);
sb->high_rxt += n_written;
+ ASSERT (seq_leq (sb->high_rxt, tc->snd_nxt));
+
snd_space -= n_written;
n_segs += 1;
}
if (hole)
- tcp_program_fastretransmit (tc);
+ tcp_program_retransmit (tc);
done:
+
+ transport_connection_tx_pacer_reset_bucket (&tc->connection, 0);
return n_segs;
}
/**
* Fast retransmit without SACK info
*/
-int
-tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
- u32 burst_size)
+static int
+tcp_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
+ u32 burst_size)
{
- u32 n_written = 0, offset = 0, bi, max_deq, n_segs_now;
+ u32 n_written = 0, offset = 0, bi, max_deq, n_segs_now, max_bytes;
+ u32 burst_bytes, sent_bytes;
vlib_main_t *vm = wrk->vm;
int snd_space, n_segs = 0;
+ u8 cc_limited = 0;
vlib_buffer_t *b;
- ASSERT (tcp_in_fastrecovery (tc));
- TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
+ ASSERT (tcp_in_cong_recovery (tc));
+ TCP_EVT (TCP_EVT_CC_EVT, tc, 0);
+
+ burst_bytes = transport_connection_tx_pacer_burst (&tc->connection);
+ burst_size = clib_min (burst_size, burst_bytes / tc->snd_mss);
+ if (!burst_size)
+ {
+ tcp_program_retransmit (tc);
+ return 0;
+ }
snd_space = tcp_available_cc_snd_space (tc);
+ cc_limited = snd_space < burst_bytes;
if (!tcp_fastrecovery_first (tc))
goto send_unsent;
* segment. */
while (snd_space > 0 && n_segs < burst_size)
{
- n_written = tcp_prepare_retransmit_segment (wrk, tc, offset,
- tc->snd_mss, &b);
+ max_bytes = clib_min (tc->snd_mss,
+ tc->snd_congestion - tc->snd_una - offset);
+ if (!max_bytes)
+ break;
+ n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes,
+ &b);
/* Nothing left to retransmit */
if (n_written == 0)
{
snd_space = clib_min (max_deq, snd_space);
burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss);
- n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size);
- if (max_deq > n_segs_now * tc->snd_mss)
- tcp_program_fastretransmit (tc);
+ n_segs_now = tcp_transmit_unsent (wrk, tc, burst_size);
+ if (n_segs_now && max_deq > n_segs_now * tc->snd_mss)
+ tcp_program_retransmit (tc);
n_segs += n_segs_now;
}
done:
tcp_fastrecovery_first_off (tc);
- return n_segs;
-}
-/**
- * Do fast retransmit
- */
-int
-tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
- u32 burst_size)
-{
- if (tcp_opts_sack_permitted (&tc->rcv_opts))
- return tcp_fast_retransmit_sack (wrk, tc, burst_size);
- else
- return tcp_fast_retransmit_no_sack (wrk, tc, burst_size);
+ sent_bytes = clib_min (n_segs * tc->snd_mss, burst_bytes);
+ sent_bytes = cc_limited ? burst_bytes : sent_bytes;
+ transport_connection_tx_pacer_update_bytes (&tc->connection, sent_bytes);
+
+ return n_segs;
}
static int
if (!tc->pending_dupacks)
{
- tcp_send_ack (tc);
- return 1;
+ if (tcp_in_cong_recovery (tc) || !tcp_max_tx_deq (tc)
+ || tc->state != TCP_STATE_ESTABLISHED)
+ {
+ tcp_send_ack (tc);
+ return 1;
+ }
+ return 0;
}
/* If we're supposed to send dupacks but have no ooo data
if (!vec_len (tc->snd_sacks))
{
tcp_send_ack (tc);
+ tc->dupacks_out += 1;
+ tc->pending_dupacks = 0;
return 1;
}
{
tc->pending_dupacks = 0;
tc->snd_sack_pos = 0;
+ tc->dupacks_out += n_acks;
return n_acks;
}
else
{
TCP_DBG ("constrained by burst size");
tc->pending_dupacks = n_acks - max_burst_size;
+ tc->dupacks_out += max_burst_size;
tcp_program_dupack (tc);
return max_burst_size;
}
}
static int
-tcp_do_fastretransmit (tcp_connection_t * tc, u32 max_burst_size)
+tcp_do_retransmit (tcp_connection_t * tc, u32 max_burst_size)
{
- u32 n_segs = 0, burst_size, sent_bytes, burst_bytes;
tcp_worker_ctx_t *wrk;
+ u32 n_segs;
+
+ if (PREDICT_FALSE (tc->state == TCP_STATE_CLOSED))
+ return 0;
wrk = tcp_get_worker (tc->c_thread_index);
- burst_bytes = transport_connection_tx_pacer_burst (&tc->connection,
- wrk->vm->
- clib_time.last_cpu_time);
- burst_size = clib_min (max_burst_size, burst_bytes / tc->snd_mss);
- if (!burst_size)
- {
- tcp_program_fastretransmit (tc);
- return 0;
- }
- n_segs = tcp_fast_retransmit (wrk, tc, burst_size);
- sent_bytes = clib_min (n_segs * tc->snd_mss, burst_bytes);
- transport_connection_tx_pacer_update_bytes (&tc->connection, sent_bytes);
+ if (tcp_opts_sack_permitted (&tc->rcv_opts))
+ n_segs = tcp_retransmit_sack (wrk, tc, max_burst_size);
+ else
+ n_segs = tcp_retransmit_no_sack (wrk, tc, max_burst_size);
+
return n_segs;
}
tcp_connection_t *tc = (tcp_connection_t *) conn;
u32 n_segs = 0;
- if (tcp_in_fastrecovery (tc) && (tc->flags & TCP_CONN_FRXT_PENDING))
+ if (tcp_in_cong_recovery (tc) && (tc->flags & TCP_CONN_RXT_PENDING))
{
- tc->flags &= ~TCP_CONN_FRXT_PENDING;
- n_segs = tcp_do_fastretransmit (tc, max_burst_size);
+ tc->flags &= ~TCP_CONN_RXT_PENDING;
+ n_segs = tcp_do_retransmit (tc, max_burst_size);
max_burst_size -= n_segs;
}
tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
u32 * to_next, u32 n_bufs)
{
- u32 n_trace = vlib_get_trace_count (vm, node);
tcp_connection_t *tc;
tcp_tx_trace_t *t;
vlib_buffer_t *b;
tcp_header_t *th;
int i;
- for (i = 0; i < clib_min (n_trace, n_bufs); i++)
+ for (i = 0; i < n_bufs; i++)
{
b = vlib_get_buffer (vm, to_next[i]);
+ if (!(b->flags & VLIB_BUFFER_IS_TRACED))
+ continue;
th = vlib_buffer_get_current (b);
tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
vm->thread_index);
tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
tcp_connection_t * tc0, u8 is_ip4)
{
- tcp_header_t *th0 = 0;
+ TCP_EVT (TCP_EVT_OUTPUT, tc0,
+ ((tcp_header_t *) vlib_buffer_get_current (b0))->flags,
+ b0->current_length);
- th0 = vlib_buffer_get_current (b0);
- TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
if (is_ip4)
- {
- vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
- IP_PROTOCOL_TCP, 1);
- b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
- vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
- th0->checksum = 0;
- }
+ vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
+ IP_PROTOCOL_TCP, tcp_csum_offload (tc0));
else
- {
- ip6_header_t *ih0;
- ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
- &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
- b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
- vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
- vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
- th0->checksum = 0;
- }
+ vlib_buffer_push_ip6_custom (vm, b0, &tc0->c_lcl_ip6, &tc0->c_rmt_ip6,
+ IP_PROTOCOL_TCP, tc0->ipv6_flow_label);
}
always_inline void
-tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
- u32 * error0, u16 * next0, u8 is_ip4)
+tcp_check_if_gso (tcp_connection_t * tc, vlib_buffer_t * b)
{
+ if (PREDICT_TRUE (!(tc->cfg_flags & TCP_CFG_F_TSO)))
+ return;
+
+ u16 data_len = b->current_length - sizeof (tcp_header_t) - tc->snd_opts_len;
- if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
+ if (PREDICT_FALSE (b->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID))
+ data_len += b->total_length_not_including_first_buffer;
+
+ if (PREDICT_TRUE (data_len <= tc->snd_mss))
+ return;
+ else
{
- *error0 = TCP_ERROR_INVALID_CONNECTION;
- *next0 = TCP_OUTPUT_NEXT_DROP;
- return;
+ ASSERT ((b->flags & VNET_BUFFER_F_L3_HDR_OFFSET_VALID) != 0);
+ ASSERT ((b->flags & VNET_BUFFER_F_L4_HDR_OFFSET_VALID) != 0);
+ b->flags |= VNET_BUFFER_F_GSO;
+ vnet_buffer2 (b)->gso_l4_hdr_sz =
+ sizeof (tcp_header_t) + tc->snd_opts_len;
+ vnet_buffer2 (b)->gso_size = tc->snd_mss;
}
+}
+always_inline void
+tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
+ vlib_node_runtime_t * error_node, u16 * next0,
+ u8 is_ip4)
+{
/* If next_index is not drop use it */
if (tc0->next_node_index)
{
*next0 = tc0->next_node_index;
vnet_buffer (b0)->tcp.next_node_opaque = tc0->next_node_opaque;
}
+ else
+ {
+ *next0 = TCP_OUTPUT_NEXT_IP_LOOKUP;
+ }
vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
if (!is_ip4)
{
+ u32 error0 = 0;
+
if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
- tcp_output_handle_link_local (tc0, b0, next0, error0);
+ tcp_output_handle_link_local (tc0, b0, next0, &error0);
+
+ if (PREDICT_FALSE (error0))
+ {
+ b0->error = error_node->errors[error0];
+ return;
+ }
}
if (!TCP_ALWAYS_ACK)
tcp_timer_reset (tc0, TCP_TIMER_DELACK);
+
+ tc0->segs_out += 1;
}
always_inline uword
u32 n_left_from, *from, thread_index = vm->thread_index;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
u16 nexts[VLIB_FRAME_SIZE], *next;
+ vlib_node_runtime_t *error_node;
+
+ error_node = vlib_node_get_runtime (vm, tcp_node_index (output, is_ip4));
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
while (n_left_from >= 4)
{
- u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT;
tcp_connection_t *tc0, *tc1;
{
CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
}
- next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP;
-
tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
thread_index);
tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
thread_index);
- tcp_output_push_ip (vm, b[0], tc0, is_ip4);
- tcp_output_push_ip (vm, b[1], tc1, is_ip4);
+ if (PREDICT_TRUE (!tc0 + !tc1 == 0))
+ {
+ tcp_output_push_ip (vm, b[0], tc0, is_ip4);
+ tcp_output_push_ip (vm, b[1], tc1, is_ip4);
+
+ tcp_check_if_gso (tc0, b[0]);
+ tcp_check_if_gso (tc1, b[1]);
- tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
- tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4);
+ tcp_output_handle_packet (tc0, b[0], error_node, &next[0], is_ip4);
+ tcp_output_handle_packet (tc1, b[1], error_node, &next[1], is_ip4);
+ }
+ else
+ {
+ if (tc0 != 0)
+ {
+ tcp_output_push_ip (vm, b[0], tc0, is_ip4);
+ tcp_check_if_gso (tc0, b[0]);
+ tcp_output_handle_packet (tc0, b[0], error_node, &next[0],
+ is_ip4);
+ }
+ else
+ {
+ b[0]->error = error_node->errors[TCP_ERROR_INVALID_CONNECTION];
+ next[0] = TCP_OUTPUT_NEXT_DROP;
+ }
+ if (tc1 != 0)
+ {
+ tcp_output_push_ip (vm, b[1], tc1, is_ip4);
+ tcp_check_if_gso (tc1, b[1]);
+ tcp_output_handle_packet (tc1, b[1], error_node, &next[1],
+ is_ip4);
+ }
+ else
+ {
+ b[1]->error = error_node->errors[TCP_ERROR_INVALID_CONNECTION];
+ next[1] = TCP_OUTPUT_NEXT_DROP;
+ }
+ }
b += 2;
next += 2;
}
while (n_left_from > 0)
{
- u32 error0 = TCP_ERROR_PKTS_SENT;
tcp_connection_t *tc0;
if (n_left_from > 1)
CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
}
- next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP;
tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
thread_index);
- tcp_output_push_ip (vm, b[0], tc0, is_ip4);
- tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4);
+ if (PREDICT_TRUE (tc0 != 0))
+ {
+ tcp_output_push_ip (vm, b[0], tc0, is_ip4);
+ tcp_check_if_gso (tc0, b[0]);
+ tcp_output_handle_packet (tc0, b[0], error_node, &next[0], is_ip4);
+ }
+ else
+ {
+ b[0]->error = error_node->errors[TCP_ERROR_INVALID_CONNECTION];
+ next[0] = TCP_OUTPUT_NEXT_DROP;
+ }
b += 1;
next += 1;
}
vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
+ vlib_node_increment_counter (vm, tcp_node_index (output, is_ip4),
+ TCP_ERROR_PKTS_SENT, frame->n_vectors);
return frame->n_vectors;
}
tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * from_frame, u8 is_ip4)
{
+ u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
u32 n_left_from, next_index, *from, *to_next;
- u32 my_thread_index = vm->thread_index;
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
while (n_left_from > 0 && n_left_to_next > 0)
{
- u32 bi0;
vlib_buffer_t *b0;
tcp_tx_trace_t *t0;
tcp_header_t *th0;
- u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP;
+ u32 bi0;
bi0 = from[0];
to_next[0] = bi0;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
-
- if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags,
- my_thread_index, is_ip4))
- {
- error0 = TCP_ERROR_LOOKUP_DROPS;
- next0 = TCP_RESET_NEXT_DROP;
- goto done;
- }
+ tcp_make_reset_in_place (vm, b0, is_ip4);
/* Prepare to send to IP lookup */
vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
- next0 = TCP_RESET_NEXT_IP_LOOKUP;
- done:
b0->error = node->errors[error0];
b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
Code Review / vpp.git / blobdiff