X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Ftcp%2Ftcp_output.c;h=7b0303f30335f31e50adef9f60430c87bc5e9083;hb=1cfcb78940580c8e3645fca0419d32f9286e942d;hp=5e9ecf114a72441d5227c3dfa73761c36ac82d3d;hpb=6534b7aa13bc5bed15ed87f47bb766405963e9e8;p=vpp.git diff --git a/src/vnet/tcp/tcp_output.c b/src/vnet/tcp/tcp_output.c index 5e9ecf114a7..7b0303f3033 100644 --- a/src/vnet/tcp/tcp_output.c +++ b/src/vnet/tcp/tcp_output.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2016 Cisco and/or its affiliates. + * Copyright (c) 2016-2019 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: @@ -14,25 +14,28 @@ */ #include -#include - -vlib_node_registration_t tcp4_output_node; -vlib_node_registration_t tcp6_output_node; +#include typedef enum _tcp_output_next { TCP_OUTPUT_NEXT_DROP, TCP_OUTPUT_NEXT_IP_LOOKUP, + TCP_OUTPUT_NEXT_IP_REWRITE, + TCP_OUTPUT_NEXT_IP_ARP, TCP_OUTPUT_N_NEXT } tcp_output_next_t; #define foreach_tcp4_output_next \ _ (DROP, "error-drop") \ - _ (IP_LOOKUP, "ip4-lookup") + _ (IP_LOOKUP, "ip4-lookup") \ + _ (IP_REWRITE, "ip4-rewrite") \ + _ (IP_ARP, "ip4-arp") #define foreach_tcp6_output_next \ _ (DROP, "error-drop") \ - _ (IP_LOOKUP, "ip6-lookup") + _ (IP_LOOKUP, "ip6-lookup") \ + _ (IP_REWRITE, "ip6-rewrite") \ + _ (IP_ARP, "ip6-discover-neighbor") static char *tcp_error_strings[] = { #define tcp_error(n,s) s, @@ -46,15 +49,13 @@ typedef struct tcp_connection_t tcp_connection; } tcp_tx_trace_t; -u16 dummy_mtu = 1460; - -u8 * +static u8 * format_tcp_tx_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 *); tcp_tx_trace_t *t = va_arg (*args, tcp_tx_trace_t *); - uword indent = format_get_indent (s); + u32 indent = format_get_indent (s); s = format (s, "%U\n%U%U", format_tcp_header, &t->tcp_header, 128, @@ -64,12 +65,12 @@ format_tcp_tx_trace (u8 * s, va_list * args) return s; } +#ifndef CLIB_MARCH_VARIANT static u8 -tcp_window_compute_scale (u32 available_space) +tcp_window_compute_scale (u32 window) { u8 wnd_scale = 0; - while (wnd_scale < TCP_MAX_WND_SCALE - && (available_space >> wnd_scale) > TCP_WND_MAX) + while (wnd_scale < TCP_MAX_WND_SCALE && (window >> wnd_scale) > TCP_WND_MAX) wnd_scale++; return wnd_scale; } @@ -84,7 +85,7 @@ void tcp_update_rcv_mss (tcp_connection_t * tc) { /* TODO find our iface MTU */ - tc->mss = dummy_mtu; + tc->mss = tcp_main.default_mtu - sizeof (tcp_header_t); } /** @@ -112,56 +113,36 @@ tcp_initial_wnd_unscaled (tcp_connection_t * tc) 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 = TCP_MAX_RX_FIFO_SIZE; + 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 (max_fifo); tc->rcv_wnd = tcp_initial_wnd_unscaled (tc); return clib_min (tc->rcv_wnd, TCP_WND_MAX); } -/** - * Compute and return window to advertise, scaled as per RFC1323 - */ -u32 -tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state) -{ - if (state < TCP_STATE_ESTABLISHED) - return tcp_initial_window_to_advertise (tc); - - tcp_update_rcv_wnd (tc); - - if (tc->rcv_wnd == 0) - { - tc->flags |= TCP_CONN_SENT_RCV_WND0; - } - else - { - tc->flags &= ~TCP_CONN_SENT_RCV_WND0; - } - - return tc->rcv_wnd >> tc->rcv_wscale; -} - -void +static inline void tcp_update_rcv_wnd (tcp_connection_t * tc) { + u32 available_space, wnd; i32 observed_wnd; - u32 available_space, max_fifo, wnd; + + ASSERT (tc->rcv_opts.mss < transport_rx_fifo_size (&tc->connection)); /* * Figure out how much space we have available */ - available_space = stream_session_max_rx_enqueue (&tc->connection); - max_fifo = stream_session_rx_fifo_size (&tc->connection); - - ASSERT (tc->rcv_opts.mss < max_fifo); - if (available_space < tc->rcv_opts.mss && available_space < max_fifo >> 3) + available_space = transport_max_rx_enqueue (&tc->connection); + if (PREDICT_FALSE (available_space < tc->rcv_opts.mss)) available_space = 0; /* @@ -169,13 +150,11 @@ tcp_update_rcv_wnd (tcp_connection_t * tc) * to compute the new window */ observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las); - if (observed_wnd < 0) - observed_wnd = 0; /* Bad. Thou shalt not shrink */ - if (available_space < observed_wnd) + if (PREDICT_FALSE ((i32) available_space < observed_wnd)) { - wnd = observed_wnd; + wnd = clib_max (observed_wnd, 0); TCP_EVT_DBG (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space); } else @@ -186,7 +165,7 @@ tcp_update_rcv_wnd (tcp_connection_t * tc) /* Make sure we have a multiple of rcv_wscale */ if (wnd && tc->rcv_wscale) { - wnd &= ~(1 << tc->rcv_wscale); + wnd &= ~((1 << tc->rcv_wscale) - 1); if (wnd == 0) wnd = 1 << tc->rcv_wscale; } @@ -194,10 +173,23 @@ tcp_update_rcv_wnd (tcp_connection_t * tc) tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale); } +/** + * Compute and return window to advertise, scaled as per RFC1323 + */ +static inline u32 +tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state) +{ + if (state < TCP_STATE_ESTABLISHED) + return tcp_initial_window_to_advertise (tc); + + tcp_update_rcv_wnd (tc); + return tc->rcv_wnd >> tc->rcv_wscale; +} + /** * Write TCP options to segment. */ -u32 +static u32 tcp_options_write (u8 * data, tcp_options_t * opts) { u32 opts_len = 0; @@ -208,7 +200,7 @@ tcp_options_write (u8 * data, tcp_options_t * opts) *data++ = TCP_OPTION_MSS; *data++ = TCP_OPTION_LEN_MSS; buf = clib_host_to_net_u16 (opts->mss); - clib_memcpy (data, &buf, sizeof (opts->mss)); + clib_memcpy_fast (data, &buf, sizeof (opts->mss)); data += sizeof (opts->mss); opts_len += TCP_OPTION_LEN_MSS; } @@ -233,10 +225,10 @@ tcp_options_write (u8 * data, tcp_options_t * opts) *data++ = TCP_OPTION_TIMESTAMP; *data++ = TCP_OPTION_LEN_TIMESTAMP; buf = clib_host_to_net_u32 (opts->tsval); - clib_memcpy (data, &buf, sizeof (opts->tsval)); + clib_memcpy_fast (data, &buf, sizeof (opts->tsval)); data += sizeof (opts->tsval); buf = clib_host_to_net_u32 (opts->tsecr); - clib_memcpy (data, &buf, sizeof (opts->tsecr)); + clib_memcpy_fast (data, &buf, sizeof (opts->tsecr)); data += sizeof (opts->tsecr); opts_len += TCP_OPTION_LEN_TIMESTAMP; } @@ -244,23 +236,21 @@ tcp_options_write (u8 * data, tcp_options_t * opts) if (tcp_opts_sack (opts)) { int i; - u32 n_sack_blocks = clib_min (vec_len (opts->sacks), - TCP_OPTS_MAX_SACK_BLOCKS); - if (n_sack_blocks != 0) + if (opts->n_sack_blocks != 0) { *data++ = TCP_OPTION_SACK_BLOCK; - *data++ = 2 + n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK; - for (i = 0; i < n_sack_blocks; i++) + *data++ = 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK; + for (i = 0; i < opts->n_sack_blocks; i++) { buf = clib_host_to_net_u32 (opts->sacks[i].start); - clib_memcpy (data, &buf, seq_len); + clib_memcpy_fast (data, &buf, seq_len); data += seq_len; buf = clib_host_to_net_u32 (opts->sacks[i].end); - clib_memcpy (data, &buf, seq_len); + clib_memcpy_fast (data, &buf, seq_len); data += seq_len; } - opts_len += 2 + n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK; + opts_len += 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK; } } @@ -280,13 +270,13 @@ tcp_options_write (u8 * data, tcp_options_t * opts) return opts_len; } -always_inline int +static int tcp_make_syn_options (tcp_options_t * opts, u8 wnd_scale) { u8 len = 0; opts->flags |= TCP_OPTS_FLAG_MSS; - opts->mss = dummy_mtu; /*XXX discover that */ + opts->mss = tcp_main.default_mtu; /*XXX discover that */ len += TCP_OPTION_LEN_MSS; opts->flags |= TCP_OPTS_FLAG_WSCALE; @@ -309,7 +299,7 @@ tcp_make_syn_options (tcp_options_t * opts, u8 wnd_scale) return len; } -always_inline int +static int tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts) { u8 len = 0; @@ -344,7 +334,7 @@ tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts) return len; } -always_inline int +static int tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts) { u8 len = 0; @@ -354,7 +344,7 @@ tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts) if (tcp_opts_tstamp (&tc->rcv_opts)) { opts->flags |= TCP_OPTS_FLAG_TSTAMP; - opts->tsval = tcp_time_now (); + opts->tsval = tcp_tstamp (tc); opts->tsecr = tc->tsval_recent; len += TCP_OPTION_LEN_TIMESTAMP; } @@ -363,9 +353,13 @@ tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts) if (vec_len (tc->snd_sacks)) { opts->flags |= TCP_OPTS_FLAG_SACK; - opts->sacks = tc->snd_sacks; - opts->n_sack_blocks = clib_min (vec_len (tc->snd_sacks), + if (tc->snd_sack_pos >= vec_len (tc->snd_sacks)) + tc->snd_sack_pos = 0; + opts->sacks = &tc->snd_sacks[tc->snd_sack_pos]; + opts->n_sack_blocks = vec_len (tc->snd_sacks) - tc->snd_sack_pos; + opts->n_sack_blocks = clib_min (opts->n_sack_blocks, TCP_OPTS_MAX_SACK_BLOCKS); + tc->snd_sack_pos += opts->n_sack_blocks; len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks; } } @@ -382,33 +376,58 @@ tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts, switch (state) { case TCP_STATE_ESTABLISHED: + case TCP_STATE_CLOSE_WAIT: case TCP_STATE_FIN_WAIT_1: + case TCP_STATE_LAST_ACK: + case TCP_STATE_CLOSING: + case TCP_STATE_FIN_WAIT_2: + case TCP_STATE_TIME_WAIT: + case TCP_STATE_CLOSED: return tcp_make_established_options (tc, opts); 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); default: - clib_warning ("Not handled!"); + clib_warning ("State not handled! %d", state); return 0; } } /** - * Update snd_mss to reflect the effective segment size that we can send - * by taking into account all TCP options, including SACKs + * Update burst send vars + * + * - Updates snd_mss to reflect the effective segment size that we can send + * by taking into account all TCP options, including SACKs. + * - Cache 'on the wire' options for reuse + * - Updates receive window which can be reused for a burst. + * + * This should *only* be called when doing bursts */ void -tcp_update_snd_mss (tcp_connection_t * tc) +tcp_update_burst_snd_vars (tcp_connection_t * tc) { + tcp_main_t *tm = &tcp_main; + /* Compute options to be used for connection. These may be reused when * sending data or to compute the effective mss (snd_mss) */ - tc->snd_opts_len = - tcp_make_options (tc, &tc->snd_opts, TCP_STATE_ESTABLISHED); + tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, + TCP_STATE_ESTABLISHED); /* XXX check if MTU has been updated */ tc->snd_mss = clib_min (tc->mss, tc->rcv_opts.mss) - tc->snd_opts_len; ASSERT (tc->snd_mss > 0); + + tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts, + &tc->snd_opts); + + tcp_update_rcv_wnd (tc); + + if (tc->flags & TCP_CONN_RATE_SAMPLE) + tc->flags |= TCP_CONN_TRACK_BURST; + + if (tc->snd_una == tc->snd_nxt) + tcp_cc_event (tc, TCP_CC_EVT_START_TX); } void @@ -422,7 +441,6 @@ tcp_init_mss (tcp_connection_t * tc) if (tc->snd_mss < 45) { - clib_warning ("snd mss is 0"); /* Assume that at least the min default mss works */ tc->snd_mss = default_min_mss; tc->rcv_opts.mss = default_min_mss; @@ -435,58 +453,42 @@ tcp_init_mss (tcp_connection_t * tc) if (tcp_opts_tstamp (&tc->rcv_opts)) tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP; } +#endif /* CLIB_MARCH_VARIANT */ -#define tcp_get_free_buffer_index(tm, bidx) \ -do { \ - u32 *my_tx_buffers, n_free_buffers; \ - u32 thread_index = vlib_get_thread_index(); \ - my_tx_buffers = tm->tx_buffers[thread_index]; \ - if (PREDICT_FALSE(vec_len (my_tx_buffers) == 0)) \ - { \ - n_free_buffers = 32; /* TODO config or macro */ \ - vec_validate (my_tx_buffers, n_free_buffers - 1); \ - _vec_len(my_tx_buffers) = vlib_buffer_alloc_from_free_list ( \ - vlib_get_main(), my_tx_buffers, n_free_buffers, \ - VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX); \ - tm->tx_buffers[thread_index] = my_tx_buffers; \ - } \ - /* buffer shortage */ \ - if (PREDICT_FALSE (vec_len (my_tx_buffers) == 0)) \ - return; \ - *bidx = my_tx_buffers[_vec_len (my_tx_buffers)-1]; \ - _vec_len (my_tx_buffers) -= 1; \ -} while (0) - -#define tcp_return_buffer(tm) \ -do { \ - u32 *my_tx_buffers; \ - u32 thread_index = vlib_get_thread_index(); \ - my_tx_buffers = tm->tx_buffers[thread_index]; \ - _vec_len (my_tx_buffers) +=1; \ -} while (0) - -always_inline void +static void * tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b) { - vlib_buffer_t *it = b; - do - { - it->current_data = 0; - it->current_length = 0; - it->total_length_not_including_first_buffer = 0; - } - while ((it->flags & VLIB_BUFFER_NEXT_PRESENT) - && (it = vlib_get_buffer (vm, it->next_buffer))); + if (b->flags & VLIB_BUFFER_NEXT_PRESENT) + vlib_buffer_free_one (vm, b->next_buffer); + /* Zero all flags but free list index and trace flag */ + b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1; + b->current_data = 0; + b->current_length = 0; + b->total_length_not_including_first_buffer = 0; + vnet_buffer (b)->tcp.flags = 0; /* Leave enough space for headers */ - vlib_buffer_make_headroom (b, MAX_HDRS_LEN); + return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN); +} + +#ifndef CLIB_MARCH_VARIANT +static void * +tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b) +{ + ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0); + b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; + b->total_length_not_including_first_buffer = 0; + b->current_data = 0; vnet_buffer (b)->tcp.flags = 0; + VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b); + /* Leave enough space for headers */ + return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN); } /** * Prepare ACK */ -void +static inline void tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state, u8 flags) { @@ -506,20 +508,21 @@ tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state, tcp_options_write ((u8 *) (th + 1), snd_opts); vnet_buffer (b)->tcp.connection_index = tc->c_c_index; + + if (wnd == 0) + tcp_zero_rwnd_sent_on (tc); + else + tcp_zero_rwnd_sent_off (tc); } /** * Convert buffer to ACK */ -void +static inline void tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b) { - vlib_main_t *vm = vlib_get_main (); - - tcp_reuse_buffer (vm, b); tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK); TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc); - vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_ACK; tc->rcv_las = tc->rcv_nxt; } @@ -529,18 +532,32 @@ tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b) void tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b) { - vlib_main_t *vm = vlib_get_main (); - u8 flags = 0; + tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK); +} - tcp_reuse_buffer (vm, b); +/** + * Convert buffer to SYN + */ +void +tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b) +{ + u8 tcp_hdr_opts_len, tcp_opts_len; + tcp_header_t *th; + u16 initial_wnd; + tcp_options_t snd_opts; - flags = TCP_FLAG_FIN | TCP_FLAG_ACK; - tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, flags); + initial_wnd = tcp_initial_window_to_advertise (tc); - /* Reset flags, make sure ack is sent */ - vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK; + /* 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_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t); - tc->snd_nxt += 1; + th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss, + tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN, + initial_wnd); + vnet_buffer (b)->tcp.connection_index = tc->c_c_index; + tcp_options_write ((u8 *) (th + 1), &snd_opts); } /** @@ -549,70 +566,124 @@ tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b) void tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b) { - vlib_main_t *vm = vlib_get_main (); tcp_options_t _snd_opts, *snd_opts = &_snd_opts; u8 tcp_opts_len, tcp_hdr_opts_len; tcp_header_t *th; u16 initial_wnd; - u32 time_now; - - memset (snd_opts, 0, sizeof (*snd_opts)); - - tcp_reuse_buffer (vm, b); - - /* Set random initial sequence */ - time_now = tcp_time_now (); - - tc->iss = random_u32 (&time_now); - tc->snd_una = tc->iss; - tc->snd_nxt = tc->iss + 1; - tc->snd_una_max = tc->snd_nxt; + clib_memset (snd_opts, 0, sizeof (*snd_opts)); initial_wnd = tcp_initial_window_to_advertise (tc); - - /* Make and write options */ tcp_opts_len = tcp_make_synack_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, tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd); - tcp_options_write ((u8 *) (th + 1), snd_opts); vnet_buffer (b)->tcp.connection_index = tc->c_c_index; - vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_ACK; - - /* Init retransmit timer */ - tcp_retransmit_timer_set (tc); - TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc); } always_inline void -tcp_enqueue_to_ip_lookup (vlib_main_t * vm, vlib_buffer_t * b, u32 bi, - u8 is_ip4) +tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi, + u8 is_ip4, u32 fib_index, u8 flush) { + vlib_main_t *vm = wrk->vm; u32 *to_next, next_index; vlib_frame_t *f; b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; b->error = 0; - /* Default FIB for now */ - vnet_buffer (b)->sw_if_index[VLIB_TX] = 0; + vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index; + vnet_buffer (b)->sw_if_index[VLIB_RX] = 0; /* Send to IP lookup */ next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index; - f = vlib_get_frame_to_node (vm, next_index); + tcp_trajectory_add_start (b, 1); + + f = wrk->ip_lookup_tx_frames[!is_ip4]; + if (!f) + { + f = vlib_get_frame_to_node (vm, next_index); + ASSERT (f); + wrk->ip_lookup_tx_frames[!is_ip4] = f; + } - /* Enqueue the packet */ to_next = vlib_frame_vector_args (f); - to_next[0] = bi; - f->n_vectors = 1; - vlib_put_frame_to_node (vm, next_index, f); + to_next[f->n_vectors] = bi; + f->n_vectors += 1; + if (flush || f->n_vectors == VLIB_FRAME_SIZE) + { + vlib_put_frame_to_node (vm, next_index, f); + wrk->ip_lookup_tx_frames[!is_ip4] = 0; + } } -int +static void +tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, + u32 bi, u8 is_ip4, u32 fib_index) +{ + tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1); +} + +static void +tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi, + u8 is_ip4, u32 fib_index) +{ + tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0); + if (wrk->vm->thread_index == 0 && vlib_num_workers ()) + 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) +{ + u32 *to_next, next_index; + vlib_frame_t *f; + + 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); +} + +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) { @@ -641,8 +712,8 @@ tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0, { ih6 = vlib_buffer_get_current (b0); ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60); - clib_memcpy (&src_ip60, &ih6->src_address, sizeof (ip6_address_t)); - clib_memcpy (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t)); + clib_memcpy_fast (&src_ip60, &ih6->src_address, sizeof (ip6_address_t)); + clib_memcpy_fast (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t)); } src_port = th0->src_port; @@ -669,13 +740,14 @@ tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0, } 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); if (is_ip4) { ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40, - IP_PROTOCOL_TCP); + IP_PROTOCOL_TCP, 1); th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4); } else @@ -690,27 +762,35 @@ tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0, return 0; } +#ifndef CLIB_MARCH_VARIANT /** * Send reset without reusing existing buffer + * + * It extracts connection info out of original packet */ void -tcp_send_reset (tcp_connection_t * tc, vlib_buffer_t * pkt, u8 is_ip4) +tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt, + u32 thread_index, u8 is_ip4) { + tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); + vlib_main_t *vm = wrk->vm; vlib_buffer_t *b; - u32 bi; - tcp_main_t *tm = vnet_get_tcp_main (); - vlib_main_t *vm = vlib_get_main (); + u32 bi, sw_if_index, fib_index; u8 tcp_hdr_len, flags = 0; tcp_header_t *th, *pkt_th; u32 seq, ack; ip4_header_t *ih4, *pkt_ih4; ip6_header_t *ih6, *pkt_ih6; + fib_protocol_t fib_proto; - tcp_get_free_buffer_index (tm, &bi); - b = vlib_get_buffer (vm, bi); + if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) + return; - /* Leave enough space for headers */ - vlib_buffer_make_headroom (b, MAX_HDRS_LEN); + b = vlib_get_buffer (vm, bi); + sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX]; + fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6; + fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index); + tcp_init_buffer (vm, b); /* Make and write options */ tcp_hdr_len = sizeof (tcp_header_t); @@ -730,7 +810,7 @@ tcp_send_reset (tcp_connection_t * tc, vlib_buffer_t * pkt, u8 is_ip4) { flags = TCP_FLAG_RST; seq = pkt_th->ack_number; - ack = (tc && tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0; + ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0; } else { @@ -747,36 +827,84 @@ tcp_send_reset (tcp_connection_t * tc, vlib_buffer_t * pkt, u8 is_ip4) { 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); + &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1); th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4); } else { int bogus = ~0; - pkt_ih6 = (ip6_header_t *) (pkt_th - 1); 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 (vm, b, &pkt_ih6->dst_address, + &pkt_ih6->src_address, IP_PROTOCOL_TCP); th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus); ASSERT (!bogus); } - tcp_enqueue_to_ip_lookup (vm, b, bi, is_ip4); + tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index); TCP_EVT_DBG (TCP_EVT_RST_SENT, tc); } +/** + * Build and set reset packet for connection + */ void -tcp_push_ip_hdr (tcp_main_t * tm, tcp_connection_t * tc, vlib_buffer_t * b) +tcp_send_reset (tcp_connection_t * tc) +{ + tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); + vlib_main_t *vm = wrk->vm; + vlib_buffer_t *b; + u32 bi; + tcp_header_t *th; + u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len; + u8 flags; + + if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) + return; + b = vlib_get_buffer (vm, bi); + tcp_init_buffer (vm, b); + + 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); + 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); + 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); +} + +static void +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 = vlib_get_main (); + 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); + &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1); th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih); } else @@ -801,83 +929,104 @@ tcp_push_ip_hdr (tcp_main_t * tm, tcp_connection_t * tc, vlib_buffer_t * b) void tcp_send_syn (tcp_connection_t * tc) { + tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); + vlib_main_t *vm = wrk->vm; vlib_buffer_t *b; u32 bi; - tcp_main_t *tm = vnet_get_tcp_main (); - vlib_main_t *vm = vlib_get_main (); - u8 tcp_hdr_opts_len, tcp_opts_len; - tcp_header_t *th; - u32 time_now; - u16 initial_wnd; - tcp_options_t snd_opts; - - tcp_get_free_buffer_index (tm, &bi); - b = vlib_get_buffer (vm, bi); - - /* Leave enough space for headers */ - vlib_buffer_make_headroom (b, MAX_HDRS_LEN); - - /* Set random initial sequence */ - time_now = tcp_time_now (); - - tc->iss = random_u32 (&time_now); - tc->snd_una = tc->iss; - tc->snd_una_max = tc->snd_nxt = tc->iss + 1; - - initial_wnd = tcp_initial_window_to_advertise (tc); - /* Make and write options */ - memset (&snd_opts, 0, sizeof (snd_opts)); - tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale); - tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t); + /* + * 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); - th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss, - tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN, - initial_wnd); + if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) + { + tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1); + return; + } - tcp_options_write ((u8 *) (th + 1), &snd_opts); + b = vlib_get_buffer (vm, bi); + tcp_init_buffer (vm, b); + tcp_make_syn (tc, b); /* Measure RTT with this */ - tc->rtt_ts = tcp_time_now (); + tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0); tc->rtt_seq = tc->snd_nxt; - - /* Start retransmit trimer */ - tcp_timer_set (tc, TCP_TIMER_RETRANSMIT_SYN, tc->rto * TCP_TO_TIMER_TICK); tc->rto_boff = 0; - /* Set the connection establishment timer */ - tcp_timer_set (tc, TCP_TIMER_ESTABLISH, TCP_ESTABLISH_TIME); - - tcp_push_ip_hdr (tm, tc, b); - tcp_enqueue_to_ip_lookup (vm, b, bi, tc->c_is_ip4); + 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); } -always_inline void -tcp_enqueue_to_output (vlib_main_t * vm, vlib_buffer_t * b, u32 bi, u8 is_ip4) +void +tcp_send_synack (tcp_connection_t * tc) { - u32 *to_next, next_index; - vlib_frame_t *f; + tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); + vlib_main_t *vm = wrk->vm; + vlib_buffer_t *b; + u32 bi; - b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; - b->error = 0; + tcp_retransmit_timer_force_update (tc); - /* Decide where to send the packet */ - next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index; + if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) + { + tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1); + return; + } + + tc->rtt_ts = tcp_time_now_us (tc->c_thread_index); + b = vlib_get_buffer (vm, bi); + 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; + } +} - /* Initialize the trajectory trace, if configured */ - if (VLIB_BUFFER_TRACE_TRAJECTORY > 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]) { - b->pre_data[0] = 1; - b->pre_data[1] = next_index; + 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; } +} - /* Enqueue the packet */ - f = vlib_get_frame_to_node (vm, next_index); - to_next = vlib_frame_vector_args (f); - to_next[0] = bi; - f->n_vectors = 1; - vlib_put_frame_to_node (vm, next_index, f); +/** + * 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); } /** @@ -886,110 +1035,233 @@ tcp_enqueue_to_output (vlib_main_t * vm, vlib_buffer_t * b, u32 bi, u8 is_ip4) void tcp_send_fin (tcp_connection_t * tc) { + tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); + vlib_main_t *vm = wrk->vm; vlib_buffer_t *b; u32 bi; - tcp_main_t *tm = vnet_get_tcp_main (); - vlib_main_t *vm = vlib_get_main (); + u8 fin_snt = 0; - tcp_get_free_buffer_index (tm, &bi); - b = vlib_get_buffer (vm, bi); + fin_snt = tc->flags & TCP_CONN_FINSNT; + if (fin_snt) + tc->snd_nxt -= 1; - /* Leave enough space for headers */ - vlib_buffer_make_headroom (b, MAX_HDRS_LEN); + if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) + { + /* Out of buffers so program fin retransmit ASAP */ + tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1); + if (fin_snt) + tc->snd_nxt += 1; + else + /* Make sure retransmit retries a fin not data */ + tc->flags |= TCP_CONN_FINSNT; + return; + } - tcp_make_fin (tc, b); - tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4); - tc->flags |= TCP_CONN_FINSNT; 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); + /* Account for the FIN */ + tc->snd_nxt += 1; + if (!fin_snt) + { + tc->flags |= TCP_CONN_FINSNT; + tc->flags &= ~TCP_CONN_FINPNDG; + tc->snd_una_max = seq_max (tc->snd_una_max, tc->snd_nxt); + } } -always_inline u8 -tcp_make_state_flags (tcp_state_t next_state) -{ - switch (next_state) - { - case TCP_STATE_ESTABLISHED: - return TCP_FLAG_ACK; - case TCP_STATE_SYN_RCVD: - return TCP_FLAG_SYN | TCP_FLAG_ACK; - case TCP_STATE_SYN_SENT: - return TCP_FLAG_SYN; - case TCP_STATE_LAST_ACK: - case TCP_STATE_FIN_WAIT_1: - return TCP_FLAG_FIN; - default: - clib_warning ("Shouldn't be here!"); - } - return 0; -} - -/** - * Push TCP header and update connection variables - */ -static void -tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b, - tcp_state_t next_state, u8 compute_opts) +/** + * Push TCP header and update connection variables. Should only be called + * for segments with data, not for 'control' packets. + */ +always_inline void +tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b, u32 snd_nxt, + u8 compute_opts, u8 maybe_burst, u8 update_snd_nxt) { + u8 tcp_hdr_opts_len, flags = TCP_FLAG_ACK; u32 advertise_wnd, data_len; - u8 tcp_hdr_opts_len, opts_write_len, flags; + tcp_main_t *tm = &tcp_main; tcp_header_t *th; - data_len = b->current_length + b->total_length_not_including_first_buffer; + data_len = b->current_length; + if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT)) + data_len += b->total_length_not_including_first_buffer; + vnet_buffer (b)->tcp.flags = 0; + vnet_buffer (b)->tcp.connection_index = tc->c_c_index; if (compute_opts) 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, next_state); - flags = tcp_make_state_flags (next_state); - /* Push header and options */ - th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt, + if (maybe_burst) + advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale; + else + advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED); + + if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING)) + { + if (seq_geq (tc->psh_seq, snd_nxt) + && seq_lt (tc->psh_seq, snd_nxt + data_len)) + flags |= TCP_FLAG_PSH; + } + th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, snd_nxt, tc->rcv_nxt, tcp_hdr_opts_len, flags, advertise_wnd); - opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts); - ASSERT (opts_write_len == tc->snd_opts_len); - vnet_buffer (b)->tcp.connection_index = tc->c_c_index; + if (maybe_burst) + { + clib_memcpy_fast ((u8 *) (th + 1), + tm->wrk_ctx[tc->c_thread_index].cached_opts, + tc->snd_opts_len); + } + else + { + u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts); + ASSERT (len == tc->snd_opts_len); + } /* * Update connection variables */ - tc->snd_nxt += data_len; + if (update_snd_nxt) + tc->snd_nxt += data_len; tc->rcv_las = tc->rcv_nxt; - /* TODO this is updated in output as well ... */ - if (seq_gt (tc->snd_nxt, tc->snd_una_max)) + TCP_EVT_DBG (TCP_EVT_PKTIZE, tc); +} + +u32 +tcp_session_push_header (transport_connection_t * tconn, vlib_buffer_t * b) +{ + tcp_connection_t *tc = (tcp_connection_t *) tconn; + + if (tc->flags & TCP_CONN_TRACK_BURST) { - tc->snd_una_max = tc->snd_nxt; - tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una); + tcp_bt_check_app_limited (tc); + tcp_bt_track_tx (tc); + tc->flags &= ~TCP_CONN_TRACK_BURST; } - TCP_EVT_DBG (TCP_EVT_PKTIZE, tc); + tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0, /* burst */ 1, + /* update_snd_nxt */ 1); + + tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max); + tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una); + /* If not tracking an ACK, start tracking */ + if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc)) + { + tc->rtt_ts = tcp_time_now_us (tc->c_thread_index); + tc->rtt_seq = tc->snd_nxt; + } + if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT))) + { + tcp_retransmit_timer_set (tc); + tc->rto_boff = 0; + } + tcp_trajectory_add_start (b, 3); + return 0; } void tcp_send_ack (tcp_connection_t * tc) { - tcp_main_t *tm = vnet_get_tcp_main (); - vlib_main_t *vm = vlib_get_main (); - + tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); + vlib_main_t *vm = wrk->vm; vlib_buffer_t *b; u32 bi; - /* Get buffer */ - tcp_get_free_buffer_index (tm, &bi); + if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) + { + tcp_update_rcv_wnd (tc); + return; + } b = vlib_get_buffer (vm, bi); - - /* Fill in the ACK */ + tcp_init_buffer (vm, b); tcp_make_ack (tc, b); - tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4); + tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); } -/* Send delayed ACK when timer expires */ +void +tcp_program_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) +{ + if (!(tc->flags & TCP_CONN_SNDACK)) + { + vec_add1 (wrk->pending_acks, tc->c_c_index); + tc->flags |= TCP_CONN_SNDACK; + } +} + +void +tcp_program_dupack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) +{ + if (!(tc->flags & TCP_CONN_SNDACK)) + { + vec_add1 (wrk->pending_acks, tc->c_c_index); + tc->flags |= TCP_CONN_SNDACK; + } + if (tc->pending_dupacks < 255) + tc->pending_dupacks += 1; +} + +void +tcp_send_acks (tcp_worker_ctx_t * wrk) +{ + u32 thread_index, *pending_acks; + tcp_connection_t *tc; + int i, j, n_acks; + + if (!vec_len (wrk->pending_acks)) + return; + + thread_index = wrk->vm->thread_index; + pending_acks = wrk->pending_acks; + for (i = 0; i < vec_len (pending_acks); i++) + { + tc = tcp_connection_get (pending_acks[i], thread_index); + tc->flags &= ~TCP_CONN_SNDACK; + if (!tc->pending_dupacks) + { + tcp_send_ack (tc); + continue; + } + + /* If we're supposed to send dupacks but have no ooo data + * send only one ack */ + if (!vec_len (tc->snd_sacks)) + { + tcp_send_ack (tc); + continue; + } + + /* Start with first sack block */ + tc->snd_sack_pos = 0; + + /* Generate enough dupacks to cover all sack blocks. Do not generate + * more sacks than the number of packets received. But do generate at + * least 3, i.e., the number needed to signal congestion, if needed. */ + n_acks = vec_len (tc->snd_sacks) / TCP_OPTS_MAX_SACK_BLOCKS; + n_acks = clib_min (n_acks, tc->pending_dupacks); + n_acks = clib_max (n_acks, clib_min (tc->pending_dupacks, 3)); + for (j = 0; j < n_acks; j++) + tcp_send_ack (tc); + + tc->pending_dupacks = 0; + tc->snd_sack_pos = 0; + } + _vec_len (wrk->pending_acks) = 0; +} + +/** + * Delayed ack timer handler + * + * Sends delayed ACK when timer expires + */ void tcp_timer_delack_handler (u32 index) { @@ -1001,52 +1273,198 @@ tcp_timer_delack_handler (u32 index) tcp_send_ack (tc); } -/** Build a retransmit segment +/** + * 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 + */ +void +tcp_send_window_update_ack (tcp_connection_t * tc) +{ + tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); + u32 win; + + if (tcp_zero_rwnd_sent (tc)) + { + win = tcp_window_to_advertise (tc, tc->state); + if (win > 0) + { + tcp_zero_rwnd_sent_off (tc); + tcp_program_ack (wrk, tc); + } + } +} + +/** + * Allocate a new buffer and build a new tcp segment + * + * @param wrk tcp worker + * @param tc connection for which the segment will be allocated + * @param offset offset of the first byte in the tx fifo + * @param max_deq_byte segment size + * @param[out] b pointer to buffer allocated + * + * @return the number of bytes in the segment or 0 if buffer cannot be + * allocated or no data available + */ +static int +tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, + u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b) +{ + u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer; + vlib_main_t *vm = wrk->vm; + u32 bi, seg_size; + int n_bytes = 0; + u8 *data; + + seg_size = max_deq_bytes + TRANSPORT_MAX_HDRS_LEN; + + /* + * Prepare options + */ + tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); + + /* + * Allocate and fill in buffer(s) + */ + + /* Easy case, buffer size greater than mss */ + if (PREDICT_TRUE (seg_size <= bytes_per_buffer)) + { + if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) + return 0; + *b = vlib_get_buffer (vm, bi); + data = tcp_init_buffer (vm, *b); + n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset, + max_deq_bytes); + ASSERT (n_bytes == max_deq_bytes); + b[0]->current_length = n_bytes; + tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0, + /* burst */ 0, /* update_snd_nxt */ 0); + } + /* Split mss into multiple buffers */ + else + { + u32 chain_bi = ~0, n_bufs_per_seg, n_bufs; + u16 n_peeked, len_to_deq; + vlib_buffer_t *chain_b, *prev_b; + int i; + + /* Make sure we have enough buffers */ + n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer); + vec_validate_aligned (wrk->tx_buffers, n_bufs_per_seg - 1, + CLIB_CACHE_LINE_BYTES); + n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, n_bufs_per_seg); + if (PREDICT_FALSE (n_bufs != n_bufs_per_seg)) + { + if (n_bufs) + vlib_buffer_free (vm, wrk->tx_buffers, n_bufs); + return 0; + } + + *b = vlib_get_buffer (vm, wrk->tx_buffers[--n_bufs]); + data = tcp_init_buffer (vm, *b); + n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset, + bytes_per_buffer - + TRANSPORT_MAX_HDRS_LEN); + b[0]->current_length = n_bytes; + b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; + b[0]->total_length_not_including_first_buffer = 0; + max_deq_bytes -= n_bytes; + + chain_b = *b; + for (i = 1; i < n_bufs_per_seg; i++) + { + prev_b = chain_b; + len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer); + chain_bi = wrk->tx_buffers[--n_bufs]; + chain_b = vlib_get_buffer (vm, chain_bi); + chain_b->current_data = 0; + data = vlib_buffer_get_current (chain_b); + n_peeked = session_tx_fifo_peek_bytes (&tc->connection, data, + offset + n_bytes, + len_to_deq); + ASSERT (n_peeked == len_to_deq); + n_bytes += n_peeked; + chain_b->current_length = n_peeked; + chain_b->next_buffer = 0; + + /* update previous buffer */ + prev_b->next_buffer = chain_bi; + prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT; + + max_deq_bytes -= n_peeked; + b[0]->total_length_not_including_first_buffer += n_peeked; + } + + tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0, + /* burst */ 0, /* update_snd_nxt */ 0); + + if (PREDICT_FALSE (n_bufs)) + { + clib_warning ("not all buffers consumed"); + vlib_buffer_free (vm, wrk->tx_buffers, n_bufs); + } + } + + ASSERT (n_bytes > 0); + ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer); + + return n_bytes; +} + +/** + * Build a retransmit segment * * @return the number of bytes in the segment or 0 if there's nothing to * retransmit */ -u32 -tcp_prepare_retransmit_segment (tcp_connection_t * tc, vlib_buffer_t * b, - u32 offset, u32 max_bytes) +static u32 +tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk, + tcp_connection_t * tc, u32 offset, + u32 max_deq_bytes, vlib_buffer_t ** b) { - vlib_main_t *vm = vlib_get_main (); + u32 start, available_bytes; int n_bytes = 0; - u32 start; - - tcp_reuse_buffer (vm, b); ASSERT (tc->state >= TCP_STATE_ESTABLISHED); - ASSERT (max_bytes != 0); + ASSERT (max_deq_bytes != 0); - max_bytes = clib_min (tc->snd_mss, max_bytes); - start = tc->snd_una + offset; + /* + * Make sure we can retransmit something + */ + available_bytes = transport_max_tx_dequeue (&tc->connection); + ASSERT (available_bytes >= offset); + available_bytes -= offset; + if (!available_bytes) + return 0; + + 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_bytes, tc->snd_congestion)) + if (seq_gt (start + max_deq_bytes, tc->snd_congestion)) { - max_bytes = tc->snd_congestion - start; - if (max_bytes == 0) + max_deq_bytes = tc->snd_congestion - start; + if (max_deq_bytes == 0) goto done; } - tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); - - ASSERT (max_bytes <= tc->snd_mss); - - n_bytes = stream_session_peek_bytes (&tc->connection, - vlib_buffer_get_current (b), offset, - max_bytes); - ASSERT (n_bytes > 0); - b->current_length = n_bytes; - tcp_push_hdr_i (tc, b, tc->state, 0); + 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; + { + tc->snd_rxt_bytes += n_bytes; + if (tc->flags & TCP_CONN_RATE_SAMPLE) + tcp_bt_track_rxt (tc, start, start + n_bytes); + } done: TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes); @@ -1057,142 +1475,212 @@ done: * Reset congestion control, switch cwnd to loss window and try again. */ static void -tcp_rtx_timeout_cc (tcp_connection_t * tc) +tcp_cc_init_rxt_timeout (tcp_connection_t * tc) { + TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6); tc->prev_ssthresh = tc->ssthresh; tc->prev_cwnd = tc->cwnd; - /* Cleanly recover cc (also clears up fast retransmit) */ + /* Clear fast recovery state if needed */ if (tcp_in_fastrecovery (tc)) - tcp_cc_fastrecovery_exit (tc); + tcp_cc_fastrecovery_clear (tc); - /* Start again from the beginning */ - tc->ssthresh = clib_max (tcp_flight_size (tc) / 2, 2 * tc->snd_mss); - tc->cwnd = tcp_loss_wnd (tc); - tc->snd_congestion = tc->snd_una_max; + /* Let cc algo decide loss cwnd and ssthresh */ + 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); tcp_recovery_on (tc); } -static void +static inline void tcp_timer_retransmit_handler_i (u32 index, u8 is_syn) { - tcp_main_t *tm = vnet_get_tcp_main (); - vlib_main_t *vm = vlib_get_main (); u32 thread_index = vlib_get_thread_index (); + tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); + vlib_main_t *vm = wrk->vm; tcp_connection_t *tc; - vlib_buffer_t *b; + 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; } - /* Make sure timer handle is set to invalid */ - tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID; - - if (!tcp_in_recovery (tc) && tc->rto_boff > 0 - && tc->state >= TCP_STATE_ESTABLISHED) - { - tc->rto_boff = 0; - tcp_update_rto (tc); - } - - /* Increment RTO backoff (also equal to number of retries) */ - tc->rto_boff += 1; - - /* Go back to first un-acked byte */ - tc->snd_nxt = tc->snd_una; - - tcp_get_free_buffer_index (tm, &bi); - b = vlib_get_buffer (vm, bi); - if (tc->state >= TCP_STATE_ESTABLISHED) { + TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2); + /* Lost FIN, retransmit and return */ if (tc->flags & TCP_CONN_FINSNT) { tcp_send_fin (tc); + tc->rto_boff += 1; + tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); + return; + } + + /* Shouldn't be here. This condition is tricky because it has to take + * into account boff > 0 due to persist timeout. */ + if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_nxt) + || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion) + && !tcp_flight_size (tc))) + { + ASSERT (!tcp_in_recovery (tc)); + tc->rto_boff = 0; + return; + } + + /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due + * to persist timer timeout */ + if (!tcp_in_recovery (tc) && tc->rto_boff > 0) + { + tc->rto_boff = 0; + tcp_update_rto (tc); + } + + /* Peer is dead or network connectivity is lost. Close connection. + * RFC 1122 section 4.2.3.5 recommends a value of at least 100s. For + * a min rto of 0.2s we need to retry about 8 times. */ + if (tc->rto_boff >= TCP_RTO_BOFF_MAX) + { + tcp_send_reset (tc); + tcp_connection_set_state (tc, TCP_STATE_CLOSED); + session_transport_closing_notify (&tc->connection); + tcp_connection_timers_reset (tc); + tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME); return; } + /* Increment RTO backoff (also equal to number of retries) and go back + * to first un-acked byte */ + tc->rto_boff += 1; + + /* TODO be less aggressive about clearing scoreboard */ + scoreboard_clear (&tc->sack_sb); + /* First retransmit timeout */ if (tc->rto_boff == 1) - tcp_rtx_timeout_cc (tc); + tcp_cc_init_rxt_timeout (tc); - /* Exponential backoff */ - tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); + if (tc->flags & TCP_CONN_RATE_SAMPLE) + tcp_bt_flush_samples (tc); - TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1); + /* If we've sent beyond snd_congestion, update it */ + tc->snd_congestion = seq_max (tc->snd_nxt, tc->snd_congestion); - /* Send one segment */ - n_bytes = tcp_prepare_retransmit_segment (tc, b, 0, tc->snd_mss); - /* TODO be less aggressive about this */ - scoreboard_clear (&tc->sack_sb); + tc->snd_nxt = tc->snd_una; + tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); - if (n_bytes == 0) + /* 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); + if (!n_bytes) { - clib_warning ("could not retransmit anything"); - clib_warning ("%U", format_tcp_connection, tc, 2); - - /* Try again eventually */ - tcp_retransmit_timer_set (tc); - ASSERT (0 || (tc->rto_boff > 1 - && tc->snd_una == tc->snd_congestion)); + tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1); return; } + 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_time_now (); + 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/SYNACK */ - else if (tc->state == TCP_STATE_SYN_RCVD || tc->state == TCP_STATE_SYN_SENT) + /* 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); + /* 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); - vlib_buffer_make_headroom (b, MAX_HDRS_LEN); - tcp_push_hdr_i (tc, b, tc->state, 1); + tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, + tc->rto * TCP_TO_TIMER_TICK); + + if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) + { + tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1); + return; + } + + b = vlib_get_buffer (vm, bi); + tcp_init_buffer (vm, b); + tcp_make_syn (tc, b); - /* Account for the SYN */ - tc->snd_nxt += 1; tc->rtt_ts = 0; - TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, - (tc->state == TCP_STATE_SYN_SENT ? 0 : 1)); + 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); } - else + /* Retransmit SYN-ACK */ + else if (tc->state == TCP_STATE_SYN_RCVD) { - ASSERT (tc->state == TCP_STATE_CLOSED); - clib_warning ("connection closed ..."); - return; - } + TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2); - if (!is_syn) - { - tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4); + 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; - /* Re-enable retransmit timer */ - tcp_retransmit_timer_set (tc); + tcp_retransmit_timer_force_update (tc); + + if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) + { + tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1); + return; + } + + 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); + + /* Retransmit timer already updated, just enqueue to output */ + tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); } else { - ASSERT (tc->state == TCP_STATE_SYN_SENT); - - /* This goes straight to ipx_lookup */ - tcp_push_ip_hdr (tm, tc, b); - tcp_enqueue_to_ip_lookup (vm, b, bi, tc->c_is_ip4); - - /* Re-enable retransmit timer */ - tcp_timer_set (tc, TCP_TIMER_RETRANSMIT_SYN, - tc->rto * TCP_TO_TIMER_TICK); + ASSERT (tc->state == TCP_STATE_CLOSED); + return; } } @@ -1215,16 +1703,17 @@ tcp_timer_retransmit_syn_handler (u32 index) void tcp_timer_persist_handler (u32 index) { - tcp_main_t *tm = vnet_get_tcp_main (); - vlib_main_t *vm = vlib_get_main (); u32 thread_index = vlib_get_thread_index (); + tcp_worker_ctx_t *wrk = tcp_get_worker (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; - u32 bi, old_snd_nxt; int n_bytes = 0; + u8 *data; tc = tcp_connection_get_if_valid (index, thread_index); - if (!tc) return; @@ -1232,116 +1721,168 @@ tcp_timer_persist_handler (u32 index) tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID; /* Problem already solved or worse */ - if (tc->state == TCP_STATE_CLOSED || tc->state > TCP_STATE_ESTABLISHED - || tc->snd_wnd > tc->snd_mss || tcp_in_recovery (tc)) + if (tc->state == TCP_STATE_CLOSED || tc->snd_wnd > tc->snd_mss + || (tc->flags & TCP_CONN_FINSNT)) return; + available_bytes = transport_max_tx_dequeue (&tc->connection); + offset = tc->snd_nxt - tc->snd_una; + + /* Reprogram persist if no new bytes available to send. We may have data + * next time */ + if (!available_bytes) + { + tcp_persist_timer_set (tc); + return; + } + + if (available_bytes <= offset) + { + ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)); + return; + } + /* Increment RTO backoff */ tc->rto_boff += 1; tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); - /* Try to force the first unsent segment */ - tcp_get_free_buffer_index (tm, &bi); - b = vlib_get_buffer (vm, bi); - - tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una); - tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); - n_bytes = stream_session_peek_bytes (&tc->connection, - vlib_buffer_get_current (b), - tc->snd_una_max - tc->snd_una, - tc->snd_mss); - /* Nothing to send */ - if (n_bytes <= 0) - { - // clib_warning ("persist found nothing to send"); - tcp_return_buffer (tm); + /* + * Try to force the first unsent segment (or buffer) + */ + if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) + { + tcp_persist_timer_set (tc); return; } + b = vlib_get_buffer (vm, bi); + data = tcp_init_buffer (vm, b); + tcp_validate_txf_size (tc, offset); + tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); + max_snd_bytes = clib_min (tc->snd_mss, + tm->bytes_per_buffer - TRANSPORT_MAX_HDRS_LEN); + n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset, + max_snd_bytes); b->current_length = n_bytes; - ASSERT (tc->snd_nxt == tc->snd_una_max || tc->rto_boff > 1 - || tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)); + ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT) + || tc->snd_nxt == tc->snd_una_max + || tc->rto_boff > 1)); - /* Allow updating of snd_una_max but don't update snd_nxt */ - old_snd_nxt = tc->snd_nxt; - tcp_push_hdr_i (tc, b, tc->state, 0); - tc->snd_nxt = old_snd_nxt; - tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4); + 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); + tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una); + tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); - /* Re-enable persist timer */ - tcp_persist_timer_set (tc); + /* Just sent new data, enable retransmit */ + tcp_retransmit_timer_update (tc); } /** * Retransmit first unacked segment */ -void -tcp_retransmit_first_unacked (tcp_connection_t * tc) +int +tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) { - tcp_main_t *tm = vnet_get_tcp_main (); - vlib_main_t *vm = vlib_get_main (); + vlib_main_t *vm = wrk->vm; vlib_buffer_t *b; - u32 bi, n_bytes, old_snd_nxt; + u32 bi, n_bytes; - old_snd_nxt = tc->snd_nxt; - tc->snd_nxt = tc->snd_una; + TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1); - /* Get buffer */ - tcp_get_free_buffer_index (tm, &bi); - b = vlib_get_buffer (vm, bi); + n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b); + if (!n_bytes) + return -1; - TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2); + bi = vlib_get_buffer_index (vm, b); + tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); - n_bytes = tcp_prepare_retransmit_segment (tc, b, 0, tc->snd_mss); - if (n_bytes == 0) + return 0; +} + +static int +tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, + u32 burst_size) +{ + u32 offset, n_segs = 0, n_written, bi; + vlib_main_t *vm = wrk->vm; + vlib_buffer_t *b = 0; + + offset = tc->snd_nxt - tc->snd_una; + while (n_segs < burst_size) { - tcp_return_buffer (tm); - goto done; - } + n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b); + if (!n_written) + goto done; - tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4); + bi = vlib_get_buffer_index (vm, b); + tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); + offset += n_written; + n_segs += 1; + + tc->snd_nxt += n_written; + tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max); + } done: - tc->snd_nxt = old_snd_nxt; + return n_segs; } +#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 */ -void -tcp_fast_retransmit_sack (tcp_connection_t * tc) +int +tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, + u32 burst_size) { - tcp_main_t *tm = vnet_get_tcp_main (); - vlib_main_t *vm = vlib_get_main (); - u32 n_written = 0, offset = 0, max_bytes; - vlib_buffer_t *b; + u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now; sack_scoreboard_hole_t *hole; + vlib_main_t *vm = wrk->vm; + vlib_buffer_t *b = 0; sack_scoreboard_t *sb; - u32 bi, old_snd_nxt; + u32 bi, max_deq; int snd_space; u8 snd_limited = 0, can_rescue = 0; ASSERT (tcp_in_fastrecovery (tc)); - TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0); - old_snd_nxt = tc->snd_nxt; - sb = &tc->sack_sb; - snd_space = tcp_available_snd_space (tc); + snd_space = tcp_available_cc_snd_space (tc); + if (snd_space < tc->snd_mss) + { + tcp_program_fastretransmit (wrk, tc); + return 0; + } + TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0); + sb = &tc->sack_sb; hole = scoreboard_get_hole (sb, sb->cur_rxt_hole); - while (hole && snd_space > 0) - { - tcp_get_free_buffer_index (tm, &bi); - b = vlib_get_buffer (vm, bi); - hole = scoreboard_next_rxt_hole (sb, hole, - tcp_fastrecovery_sent_1_smss (tc), - &can_rescue, &snd_limited); + max_deq = transport_max_tx_dequeue (&tc->connection); + max_deq -= tc->snd_nxt - tc->snd_una; + + while (snd_space > 0 && n_segs < burst_size) + { + hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue, + &snd_limited); if (!hole) { - if (!can_rescue || !(seq_lt (sb->rescue_rxt, tc->snd_una) - || seq_gt (sb->rescue_rxt, - tc->snd_congestion))) + if (max_deq) + { + 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 (wrk, tc); + n_segs += n_segs_now; + goto done; + } + + if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc)) break; /* If rescue rxt undefined or less than snd_una then one segment of @@ -1349,279 +1890,328 @@ tcp_fast_retransmit_sack (tcp_connection_t * tc) * unSACKed sequence number SHOULD be returned, and RescueRxt set to * RecoveryPoint. HighRxt MUST NOT be updated. */ - max_bytes = clib_min (tc->snd_mss, snd_space); + max_bytes = clib_min (tc->snd_mss, + tc->snd_congestion - tc->snd_una); + max_bytes = clib_min (max_bytes, snd_space); offset = tc->snd_congestion - tc->snd_una - max_bytes; sb->rescue_rxt = tc->snd_congestion; - tc->snd_nxt = tc->snd_una + offset; - tcp_prepare_retransmit_segment (tc, b, offset, max_bytes); - tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4); + n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, + max_bytes, &b); + if (!n_written) + goto done; + + bi = vlib_get_buffer_index (vm, b); + tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); + n_segs += 1; break; } - max_bytes = snd_limited ? tc->snd_mss : hole->end - sb->high_rxt; + max_bytes = clib_min (hole->end - sb->high_rxt, snd_space); + max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes; + if (max_bytes == 0) + break; + offset = sb->high_rxt - tc->snd_una; - tc->snd_nxt = tc->snd_una + offset; - n_written = tcp_prepare_retransmit_segment (tc, b, offset, max_bytes); + n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes, + &b); + ASSERT (n_written <= snd_space); /* Nothing left to retransmit */ if (n_written == 0) - { - tcp_return_buffer (tm); - break; - } + break; + + bi = vlib_get_buffer_index (vm, b); + tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); sb->high_rxt += n_written; - tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4); snd_space -= n_written; + n_segs += 1; } - /* If window allows, send 1 SMSS of new data */ - tc->snd_nxt = old_snd_nxt; + if (hole) + tcp_program_fastretransmit (wrk, tc); + +done: + return n_segs; } /** * Fast retransmit without SACK info */ -void -tcp_fast_retransmit_no_sack (tcp_connection_t * tc) +int +tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, + u32 burst_size) { - tcp_main_t *tm = vnet_get_tcp_main (); - vlib_main_t *vm = vlib_get_main (); - u32 n_written = 0, offset = 0, bi, old_snd_nxt; - int snd_space; + u32 n_written = 0, offset = 0, bi, max_deq, n_segs_now; + vlib_main_t *vm = wrk->vm; + int snd_space, n_segs = 0; vlib_buffer_t *b; ASSERT (tcp_in_fastrecovery (tc)); TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0); - /* Start resending from first un-acked segment */ - old_snd_nxt = tc->snd_nxt; - tc->snd_nxt = tc->snd_una; - snd_space = tcp_available_snd_space (tc); + snd_space = tcp_available_cc_snd_space (tc); - while (snd_space > 0) - { - tcp_get_free_buffer_index (tm, &bi); - b = vlib_get_buffer (vm, bi); + if (!tcp_fastrecovery_first (tc)) + goto send_unsent; - offset += n_written; - n_written = tcp_prepare_retransmit_segment (tc, b, offset, snd_space); + /* RFC 6582: [If a partial ack], retransmit the first unacknowledged + * segment. */ + while (snd_space > 0 && n_segs < burst_size) + { + n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, + tc->snd_mss, &b); /* Nothing left to retransmit */ if (n_written == 0) - { - tcp_return_buffer (tm); - break; - } + break; - tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4); + bi = vlib_get_buffer_index (vm, b); + tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); snd_space -= n_written; + offset += n_written; + n_segs += 1; + } + + if (n_segs == burst_size) + goto done; + +send_unsent: + + /* RFC 6582: Send a new segment if permitted by the new value of cwnd. */ + if (snd_space < tc->snd_mss || tc->snd_mss == 0) + goto done; + + max_deq = transport_max_tx_dequeue (&tc->connection); + max_deq -= tc->snd_nxt - tc->snd_una; + if (max_deq) + { + 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 (wrk, tc); + n_segs += n_segs_now; } - /* Restore snd_nxt. If window allows, send 1 SMSS of new data */ - tc->snd_nxt = old_snd_nxt; +done: + tcp_fastrecovery_first_off (tc); + return n_segs; } /** * Do fast retransmit */ -void -tcp_fast_retransmit (tcp_connection_t * tc) +int +tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, + u32 burst_size) { - if (tcp_opts_sack_permitted (&tc->rcv_opts) - && scoreboard_first_hole (&tc->sack_sb)) - tcp_fast_retransmit_sack (tc); + if (tcp_opts_sack_permitted (&tc->rcv_opts)) + return tcp_fast_retransmit_sack (wrk, tc, burst_size); else - tcp_fast_retransmit_no_sack (tc); + return tcp_fast_retransmit_no_sack (wrk, tc, burst_size); } +#endif /* CLIB_MARCH_VARIANT */ -always_inline u32 -tcp_session_has_ooo_data (tcp_connection_t * tc) +static void +tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0, + u16 * next0, u32 * error0) { - stream_session_t *s = - stream_session_get (tc->c_s_index, tc->c_thread_index); - return svm_fifo_has_ooo_data (s->server_rx_fifo); + ip_adjacency_t *adj; + adj_index_t ai; + + /* Not thread safe but as long as the connection exists the adj should + * not be removed */ + ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip, + tc0->sw_if_index); + if (ai == ADJ_INDEX_INVALID) + { + vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0; + *next0 = TCP_OUTPUT_NEXT_DROP; + *error0 = TCP_ERROR_LINK_LOCAL_RW; + return; + } + + adj = adj_get (ai); + if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE)) + *next0 = TCP_OUTPUT_NEXT_IP_REWRITE; + else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP) + *next0 = TCP_OUTPUT_NEXT_IP_ARP; + else + { + *next0 = TCP_OUTPUT_NEXT_DROP; + *error0 = TCP_ERROR_LINK_LOCAL_RW; + } + vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai; } -always_inline uword -tcp46_output_inline (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * from_frame, int is_ip4) +static void +tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node, + u32 * to_next, u32 n_bufs) { - u32 n_left_from, next_index, *from, *to_next; - u32 my_thread_index = vm->thread_index; + 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; - from = vlib_frame_vector_args (from_frame); - n_left_from = from_frame->n_vectors; + for (i = 0; i < clib_min (n_trace, n_bufs); i++) + { + b = vlib_get_buffer (vm, to_next[i]); + th = vlib_buffer_get_current (b); + tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index, + vm->thread_index); + t = vlib_add_trace (vm, node, b, sizeof (*t)); + clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header)); + clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection)); + } +} - next_index = node->cached_next_index; +always_inline void +tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0, + tcp_connection_t * tc0, u8 is_ip4) +{ + tcp_header_t *th0 = 0; - while (n_left_from > 0) + th0 = vlib_buffer_get_current (b0); + TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length); + if (is_ip4) { - u32 n_left_to_next; + 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; + } + 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_get_next_frame (vm, node, next_index, to_next, n_left_to_next); +always_inline void +tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0, + u32 * error0, u16 * next0, u8 is_ip4) +{ - while (n_left_from > 0 && n_left_to_next > 0) - { - u32 bi0; - vlib_buffer_t *b0; - tcp_connection_t *tc0; - tcp_tx_trace_t *t0; - tcp_header_t *th0 = 0; - u32 error0 = TCP_ERROR_PKTS_SENT, next0 = TCP_OUTPUT_NEXT_IP_LOOKUP; + if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED)) + { + *error0 = TCP_ERROR_INVALID_CONNECTION; + *next0 = TCP_OUTPUT_NEXT_DROP; + return; + } - bi0 = from[0]; - to_next[0] = bi0; - from += 1; - to_next += 1; - n_left_from -= 1; - n_left_to_next -= 1; + /* 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; + } - b0 = vlib_get_buffer (vm, bi0); - tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index, - my_thread_index); - if (PREDICT_FALSE (tc0 == 0 || tc0->state == TCP_STATE_CLOSED)) - { - error0 = TCP_ERROR_INVALID_CONNECTION; - next0 = TCP_OUTPUT_NEXT_DROP; - goto done; - } + vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index; + vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0; - th0 = vlib_buffer_get_current (b0); - TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length); + if (!is_ip4) + { + if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6))) + tcp_output_handle_link_local (tc0, b0, next0, error0); + } - if (is_ip4) - { - ip4_header_t *ih0; - ih0 = vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, - &tc0->c_rmt_ip4, IP_PROTOCOL_TCP); - b0->flags |= VNET_BUFFER_F_IS_IP4 | - VNET_BUFFER_F_OFFLOAD_IP_CKSUM | - 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; - } - else - { - ip6_header_t *ih0; - int bogus = ~0; - - ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6, - &tc0->c_rmt_ip6, IP_PROTOCOL_TCP); - - b0->flags |= VNET_BUFFER_F_IS_IP6 | - VNET_BUFFER_F_OFFLOAD_IP_CKSUM | - 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; - ASSERT (!bogus); - } + if (!TCP_ALWAYS_ACK) + tcp_timer_reset (tc0, TCP_TIMER_DELACK); +} - /* Filter out DUPACKs if there are no OOO segments left */ - if (PREDICT_FALSE - (vnet_buffer (b0)->tcp.flags & TCP_BUF_FLAG_DUPACK)) - { - if (!tcp_session_has_ooo_data (tc0)) - { - error0 = TCP_ERROR_FILTERED_DUPACKS; - next0 = TCP_OUTPUT_NEXT_DROP; - goto done; - } - } +always_inline uword +tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * frame, int is_ip4) +{ + u32 n_left_from, *from, thread_index = vm->thread_index; + vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; + u16 nexts[VLIB_FRAME_SIZE], *next; - /* Stop DELACK timer and fix flags */ - tc0->flags &= ~(TCP_CONN_SNDACK); - tcp_timer_reset (tc0, TCP_TIMER_DELACK); + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + tcp_set_time_now (tcp_get_worker (thread_index)); - /* If not retransmitting - * 1) update snd_una_max (SYN, SYNACK, FIN) - * 2) If we're not tracking an ACK, start tracking */ - if (seq_lt (tc0->snd_una_max, tc0->snd_nxt)) - { - tc0->snd_una_max = tc0->snd_nxt; - if (tc0->rtt_ts == 0) - { - tc0->rtt_ts = tcp_time_now (); - tc0->rtt_seq = tc0->snd_nxt; - } - } + if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE)) + tcp46_output_trace_frame (vm, node, from, n_left_from); - /* Set the retransmit timer if not set already and not - * doing a pure ACK */ - if (!tcp_timer_is_active (tc0, TCP_TIMER_RETRANSMIT) - && tc0->snd_nxt != tc0->snd_una) - { - tcp_retransmit_timer_set (tc0); - tc0->rto_boff = 0; - } + vlib_get_buffers (vm, from, bufs, n_left_from); + b = bufs; + next = nexts; -#if 0 - /* Make sure we haven't lost route to our peer */ - if (PREDICT_FALSE (tc0->last_fib_check - < tc0->snd_opts.tsval + TCP_FIB_RECHECK_PERIOD)) - { - if (PREDICT_TRUE - (tc0->c_rmt_fei == tcp_lookup_rmt_in_fib (tc0))) - { - tc0->last_fib_check = tc0->snd_opts.tsval; - } - else - { - clib_warning ("lost connection to peer"); - tcp_connection_reset (tc0); - goto done; - } - } + while (n_left_from >= 4) + { + u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT; + tcp_connection_t *tc0, *tc1; - /* Use pre-computed dpo to set next node */ - next0 = tc0->c_rmt_dpo.dpoi_next_node; - vnet_buffer (b0)->ip.adj_index[VLIB_TX] = tc0->c_rmt_dpo.dpoi_index; -#endif + { + vlib_prefetch_buffer_header (b[2], STORE); + CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE); - vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0; - vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0; + vlib_prefetch_buffer_header (b[3], STORE); + CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE); + } - b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; - done: - b0->error = node->errors[error0]; - if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) - { - t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); - if (th0) - { - clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header)); - } - else - { - memset (&t0->tcp_header, 0, sizeof (t0->tcp_header)); - } - clib_memcpy (&t0->tcp_connection, tc0, - sizeof (t0->tcp_connection)); - } + next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP; - vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, - n_left_to_next, bi0, next0); + 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); + + tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4); + tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4); + + b += 2; + next += 2; + n_left_from -= 2; + } + while (n_left_from > 0) + { + u32 error0 = TCP_ERROR_PKTS_SENT; + tcp_connection_t *tc0; + + if (n_left_from > 1) + { + vlib_prefetch_buffer_header (b[1], STORE); + CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE); } - vlib_put_next_frame (vm, node, next_index, n_left_to_next); + 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); + + b += 1; + next += 1; + n_left_from -= 1; } - return from_frame->n_vectors; + vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); + return frame->n_vectors; } -static uword -tcp4_output (vlib_main_t * vm, vlib_node_runtime_t * node, - vlib_frame_t * from_frame) +VLIB_NODE_FN (tcp4_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * from_frame) { return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ ); } -static uword -tcp6_output (vlib_main_t * vm, vlib_node_runtime_t * node, - vlib_frame_t * from_frame) +VLIB_NODE_FN (tcp6_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * from_frame) { return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ ); } @@ -1629,32 +2219,31 @@ tcp6_output (vlib_main_t * vm, vlib_node_runtime_t * node, /* *INDENT-OFF* */ VLIB_REGISTER_NODE (tcp4_output_node) = { - .function = tcp4_output,.name = "tcp4-output", - /* Takes a vector of packets. */ - .vector_size = sizeof (u32), - .n_errors = TCP_N_ERROR, - .error_strings = tcp_error_strings, - .n_next_nodes = TCP_OUTPUT_N_NEXT, - .next_nodes = { + .name = "tcp4-output", + /* Takes a vector of packets. */ + .vector_size = sizeof (u32), + .n_errors = TCP_N_ERROR, + .protocol_hint = VLIB_NODE_PROTO_HINT_TCP, + .error_strings = tcp_error_strings, + .n_next_nodes = TCP_OUTPUT_N_NEXT, + .next_nodes = { #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n, foreach_tcp4_output_next #undef _ - }, - .format_buffer = format_tcp_header, - .format_trace = format_tcp_tx_trace, + }, + .format_buffer = format_tcp_header, + .format_trace = format_tcp_tx_trace, }; /* *INDENT-ON* */ -VLIB_NODE_FUNCTION_MULTIARCH (tcp4_output_node, tcp4_output); - /* *INDENT-OFF* */ VLIB_REGISTER_NODE (tcp6_output_node) = { - .function = tcp6_output, .name = "tcp6-output", /* Takes a vector of packets. */ .vector_size = sizeof (u32), .n_errors = TCP_N_ERROR, + .protocol_hint = VLIB_NODE_PROTO_HINT_TCP, .error_strings = tcp_error_strings, .n_next_nodes = TCP_OUTPUT_N_NEXT, .next_nodes = { @@ -1667,24 +2256,6 @@ VLIB_REGISTER_NODE (tcp6_output_node) = }; /* *INDENT-ON* */ -VLIB_NODE_FUNCTION_MULTIARCH (tcp6_output_node, tcp6_output); - -u32 -tcp_push_header (transport_connection_t * tconn, vlib_buffer_t * b) -{ - tcp_connection_t *tc; - - tc = (tcp_connection_t *) tconn; - tcp_push_hdr_i (tc, b, TCP_STATE_ESTABLISHED, 0); - - if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc)) - { - tc->rtt_ts = tcp_time_now (); - tc->rtt_seq = tc->snd_nxt; - } - return 0; -} - typedef enum _tcp_reset_next { TCP_RESET_NEXT_DROP, @@ -1744,7 +2315,7 @@ tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node, } /* Prepare to send to IP lookup */ - vnet_buffer (b0)->sw_if_index[VLIB_TX] = 0; + vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0; next0 = TCP_RESET_NEXT_IP_LOOKUP; done: @@ -1758,7 +2329,8 @@ tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node, else th0 = ip6_next_header ((ip6_header_t *) th0); t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); - clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header)); + clib_memcpy_fast (&t0->tcp_header, th0, + sizeof (t0->tcp_header)); } vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, @@ -1769,23 +2341,20 @@ tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node, return from_frame->n_vectors; } -static uword -tcp4_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node, - vlib_frame_t * from_frame) +VLIB_NODE_FN (tcp4_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * from_frame) { return tcp46_send_reset_inline (vm, node, from_frame, 1); } -static uword -tcp6_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node, - vlib_frame_t * from_frame) +VLIB_NODE_FN (tcp6_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * from_frame) { return tcp46_send_reset_inline (vm, node, from_frame, 0); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (tcp4_reset_node) = { - .function = tcp4_send_reset, .name = "tcp4-reset", .vector_size = sizeof (u32), .n_errors = TCP_N_ERROR, @@ -1800,11 +2369,8 @@ VLIB_REGISTER_NODE (tcp4_reset_node) = { }; /* *INDENT-ON* */ -VLIB_NODE_FUNCTION_MULTIARCH (tcp4_reset_node, tcp4_send_reset); - /* *INDENT-OFF* */ VLIB_REGISTER_NODE (tcp6_reset_node) = { - .function = tcp6_send_reset, .name = "tcp6-reset", .vector_size = sizeof (u32), .n_errors = TCP_N_ERROR, @@ -1819,8 +2385,6 @@ VLIB_REGISTER_NODE (tcp6_reset_node) = { }; /* *INDENT-ON* */ -VLIB_NODE_FUNCTION_MULTIARCH (tcp6_reset_node, tcp6_send_reset); - /* * fd.io coding-style-patch-verification: ON *