diff options
Diffstat (limited to 'src/vnet')
| -rw-r--r-- | src/vnet/tcp/tcp.c | 2 | ||||
| -rw-r--r-- | src/vnet/tcp/tcp.h | 1 | ||||
| -rwxr-xr-x | src/vnet/tcp/tcp_debug.h | 4 | ||||
| -rw-r--r-- | src/vnet/tcp/tcp_output.c | 44 |
4 files changed, 37 insertions, 14 deletions
diff --git a/src/vnet/tcp/tcp.c b/src/vnet/tcp/tcp.c index c51224447fc..9f35b82a16f 100644 --- a/src/vnet/tcp/tcp.c +++ b/src/vnet/tcp/tcp.c @@ -840,7 +840,7 @@ format_tcp_vars (u8 * s, va_list * args) tcp_rcv_wnd_available (tc)); s = format (s, " tsval_recent %u tsval_recent_age %u\n", tc->tsval_recent, tcp_time_now () - tc->tsval_recent_age); - s = format (s, " rto %u rto_boff %u srtt %u us %.3f rttvar %u rtt_ts %x", + s = format (s, " rto %u rto_boff %u srtt %u us %.3f rttvar %u rtt_ts %.4f", tc->rto, tc->rto_boff, tc->srtt, tc->mrtt_us * 1000, tc->rttvar, tc->rtt_ts); s = format (s, " rtt_seq %u\n", tc->rtt_seq - tc->iss); diff --git a/src/vnet/tcp/tcp.h b/src/vnet/tcp/tcp.h index d1fbf156ed5..a4e7935dfe4 100644 --- a/src/vnet/tcp/tcp.h +++ b/src/vnet/tcp/tcp.h @@ -303,6 +303,7 @@ typedef struct _tcp_connection tcp_options_t rcv_opts; /**< Rx options for connection */ sack_block_t *snd_sacks; /**< Vector of SACKs to send. XXX Fixed size? */ + u8 snd_sack_pos; /**< Position in vec of first block to send */ sack_scoreboard_t sack_sb; /**< SACK "scoreboard" that tracks holes */ u16 rcv_dupacks; /**< Number of DUPACKs received */ diff --git a/src/vnet/tcp/tcp_debug.h b/src/vnet/tcp/tcp_debug.h index cf074925435..7ef7558637e 100755 --- a/src/vnet/tcp/tcp_debug.h +++ b/src/vnet/tcp/tcp_debug.h @@ -20,8 +20,8 @@ #define TCP_DEBUG (1) #define TCP_DEBUG_SM (0) -#define TCP_DEBUG_CC (0) -#define TCP_DEBUG_CC_STAT (0) +#define TCP_DEBUG_CC (1) +#define TCP_DEBUG_CC_STAT (1) #define TCP_DEBUG_BUFFER_ALLOCATION (0) #define foreach_tcp_dbg_evt \ diff --git a/src/vnet/tcp/tcp_output.c b/src/vnet/tcp/tcp_output.c index 725ffec0852..4de479c344b 100644 --- a/src/vnet/tcp/tcp_output.c +++ b/src/vnet/tcp/tcp_output.c @@ -253,14 +253,12 @@ 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_fast (data, &buf, seq_len); @@ -269,7 +267,7 @@ tcp_options_write (u8 * data, tcp_options_t * opts) 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; } } @@ -372,9 +370,13 @@ 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; } } @@ -1250,14 +1252,34 @@ tcp_send_acks (tcp_worker_ctx_t * wrk) { tc = tcp_connection_get (pending_acks[i], thread_index); tc->flags &= ~TCP_CONN_SNDACK; - n_acks = clib_max (1, tc->pending_dupacks); + 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 (tc->pending_dupacks && !vec_len (tc->snd_sacks)) - n_acks = 1; + 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; } |