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authorFlorin Coras <fcoras@cisco.com>2017-07-31 17:18:03 -0700
committerFlorin Coras <fcoras@cisco.com>2017-08-02 01:49:39 -0700
commit66b11318a1e5f24880e3ec77c95d70647732a4a8 (patch)
tree5711f1b28863d0a2130f6370f39c7777ea34b07e /src/vnet/tcp
parentfdbc38249a8c672937a74667dcfaafa2cfd292e7 (diff)
Fix tcp tx buffer allocation
- Make tcp output buffer allocation macro an inline function - Use per ip version per thread tx frames for retransmits and timer events - Fix / parameterize tcp data structure preallocation - Add a couple of gdb-callable show commands - Fix local endpoint cleanup Change-Id: I67b47b7570aa14cb4634b6fd93c57cd2eacbfa29 Signed-off-by: Florin Coras <fcoras@cisco.com> Signed-off-by: Dave Barach <dave@barachs.net>
Diffstat (limited to 'src/vnet/tcp')
-rw-r--r--src/vnet/tcp/builtin_client.c39
-rw-r--r--src/vnet/tcp/tcp.c52
-rw-r--r--src/vnet/tcp/tcp.h12
-rw-r--r--src/vnet/tcp/tcp_input.c2
-rw-r--r--src/vnet/tcp/tcp_output.c188
5 files changed, 203 insertions, 90 deletions
diff --git a/src/vnet/tcp/builtin_client.c b/src/vnet/tcp/builtin_client.c
index 27e20f8e8e5..48daffb41de 100644
--- a/src/vnet/tcp/builtin_client.c
+++ b/src/vnet/tcp/builtin_client.c
@@ -597,8 +597,9 @@ clients_connect (vlib_main_t * vm, u8 * uri, u32 n_clients)
a->mp = 0;
vnet_connect_uri (a);
- /* Crude pacing for call setups, 100k/sec */
- vlib_process_suspend (vm, 10e-6);
+ /* Crude pacing for call setups */
+ if ((i % 4) == 0)
+ vlib_process_suspend (vm, 10e-6);
}
}
@@ -612,8 +613,10 @@ test_tcp_clients_command_fn (vlib_main_t * vm,
uword *event_data = 0, event_type;
u8 *default_connect_uri = (u8 *) "tcp://6.0.1.1/1234", *uri;
u64 tmp, total_bytes;
- f64 cli_timeout = 20.0, delta;
+ f64 test_timeout = 20.0, syn_timeout = 20.0, delta;
+ f64 time_before_connects;
u32 n_clients = 1;
+ int preallocate_sessions = 0;
char *transfer_type;
int i;
@@ -640,7 +643,9 @@ test_tcp_clients_command_fn (vlib_main_t * vm,
;
else if (unformat (input, "uri %s", &tm->connect_uri))
;
- else if (unformat (input, "cli-timeout %f", &cli_timeout))
+ else if (unformat (input, "test-timeout %f", &test_timeout))
+ ;
+ else if (unformat (input, "syn-timeout %f", &syn_timeout))
;
else if (unformat (input, "no-return"))
tm->no_return = 1;
@@ -657,6 +662,8 @@ test_tcp_clients_command_fn (vlib_main_t * vm,
tm->private_segment_size = tmp;
else if (unformat (input, "preallocate-fifos"))
tm->prealloc_fifos = 1;
+ else if (unformat (input, "preallocate-sessions"))
+ preallocate_sessions = 1;
else
if (unformat (input, "client-batch %d", &tm->connections_per_batch))
;
@@ -674,6 +681,7 @@ test_tcp_clients_command_fn (vlib_main_t * vm,
return clib_error_return (0, "failed init");
}
+
tm->ready_connections = 0;
tm->expected_connections = n_clients;
tm->rx_total = 0;
@@ -705,11 +713,21 @@ test_tcp_clients_command_fn (vlib_main_t * vm,
vlib_node_set_state (vlib_mains[i], builtin_client_node.index,
VLIB_NODE_STATE_POLLING);
+ if (preallocate_sessions)
+ {
+ session_t *sp __attribute__ ((unused));
+ for (i = 0; i < n_clients; i++)
+ pool_get (tm->sessions, sp);
+ for (i = 0; i < n_clients; i++)
+ pool_put_index (tm->sessions, i);
+ }
+
/* Fire off connect requests */
+ time_before_connects = vlib_time_now (vm);
clients_connect (vm, uri, n_clients);
/* Park until the sessions come up, or ten seconds elapse... */
- vlib_process_wait_for_event_or_clock (vm, 10 /* timeout, seconds */ );
+ vlib_process_wait_for_event_or_clock (vm, syn_timeout);
event_type = vlib_process_get_events (vm, &event_data);
switch (event_type)
{
@@ -719,6 +737,15 @@ test_tcp_clients_command_fn (vlib_main_t * vm,
goto cleanup;
case 1:
+ delta = vlib_time_now (vm) - time_before_connects;
+
+ if (delta != 0.0)
+ {
+ vlib_cli_output
+ (vm, "%d three-way handshakes in %.2f seconds, %.2f/sec",
+ n_clients, delta, ((f64) n_clients) / delta);
+ }
+
tm->test_start_time = vlib_time_now (tm->vlib_main);
vlib_cli_output (vm, "Test started at %.6f", tm->test_start_time);
break;
@@ -729,7 +756,7 @@ test_tcp_clients_command_fn (vlib_main_t * vm,
}
/* Now wait for the sessions to finish... */
- vlib_process_wait_for_event_or_clock (vm, cli_timeout);
+ vlib_process_wait_for_event_or_clock (vm, test_timeout);
event_type = vlib_process_get_events (vm, &event_data);
switch (event_type)
{
diff --git a/src/vnet/tcp/tcp.c b/src/vnet/tcp/tcp.c
index 59b20747da6..8e2eb9f4e3d 100644
--- a/src/vnet/tcp/tcp.c
+++ b/src/vnet/tcp/tcp.c
@@ -173,7 +173,7 @@ tcp_connection_cleanup (tcp_connection_t * tc)
/* Cleanup local endpoint if this was an active connect */
tepi = transport_endpoint_lookup (&tm->local_endpoints_table, &tc->c_lcl_ip,
- tc->c_lcl_port);
+ clib_net_to_host_u16 (tc->c_lcl_port));
if (tepi != TRANSPORT_ENDPOINT_INVALID_INDEX)
{
tep = pool_elt_at_index (tm->local_endpoints, tepi);
@@ -367,25 +367,24 @@ tcp_allocate_local_port (ip46_address_t * ip)
{
tcp_main_t *tm = vnet_get_tcp_main ();
transport_endpoint_t *tep;
- u32 time_now, tei;
+ u32 tei;
u16 min = 1024, max = 65535; /* XXX configurable ? */
- int tries;
+ int tries, limit;
- tries = max - min;
- time_now = tcp_time_now ();
+ limit = max - min;
/* Only support active opens from thread 0 */
ASSERT (vlib_get_thread_index () == 0);
/* Search for first free slot */
- for (; tries >= 0; tries--)
+ for (tries = 0; tries < limit; tries++)
{
u16 port = 0;
/* Find a port in the specified range */
while (1)
{
- port = random_u32 (&time_now) & PORT_MASK;
+ port = random_u32 (&tm->port_allocator_seed) & PORT_MASK;
if (PREDICT_TRUE (port >= min && port < max))
break;
}
@@ -1189,8 +1188,9 @@ tcp_main_enable (vlib_main_t * vm)
vlib_thread_main_t *vtm = vlib_get_thread_main ();
clib_error_t *error = 0;
u32 num_threads;
- int thread, i;
+ int i, thread;
tcp_connection_t *tc __attribute__ ((unused));
+ u32 preallocated_connections_per_thread;
if ((error = vlib_call_init_function (vm, ip_main_init)))
return error;
@@ -1224,14 +1224,26 @@ tcp_main_enable (vlib_main_t * vm)
vec_validate (tm->connections, num_threads - 1);
/*
- * Preallocate connections
+ * Preallocate connections. Assume that thread 0 won't
+ * use preallocated threads when running multi-core
*/
- for (thread = 0; thread < num_threads; thread++)
+ if (num_threads == 1)
{
- for (i = 0; i < tm->preallocated_connections; i++)
+ thread = 0;
+ preallocated_connections_per_thread = tm->preallocated_connections;
+ }
+ else
+ {
+ thread = 1;
+ preallocated_connections_per_thread =
+ tm->preallocated_connections / (num_threads - 1);
+ }
+ for (; thread < num_threads; thread++)
+ {
+ for (i = 0; i < preallocated_connections_per_thread; i++)
pool_get (tm->connections[thread], tc);
- for (i = 0; i < tm->preallocated_connections; i++)
+ for (i = 0; i < preallocated_connections_per_thread; i++)
pool_put_index (tm->connections[thread], i);
}
@@ -1257,13 +1269,21 @@ tcp_main_enable (vlib_main_t * vm)
/ TCP_TSTAMP_RESOLUTION;
clib_bihash_init_24_8 (&tm->local_endpoints_table, "local endpoint table",
- 200000 /* $$$$ config parameter nbuckets */ ,
- (64 << 20) /*$$$ config parameter table size */ );
+ 1000000 /* $$$$ config parameter nbuckets */ ,
+ (512 << 20) /*$$$ config parameter table size */ );
+
+ /* Initialize [port-allocator] random number seed */
+ tm->port_allocator_seed = (u32) clib_cpu_time_now ();
+
if (num_threads > 1)
{
clib_spinlock_init (&tm->half_open_lock);
clib_spinlock_init (&tm->local_endpoints_lock);
}
+
+ vec_validate (tm->tx_frames[0], num_threads - 1);
+ vec_validate (tm->tx_frames[1], num_threads - 1);
+
return error;
}
@@ -1289,16 +1309,12 @@ clib_error_t *
tcp_init (vlib_main_t * vm)
{
tcp_main_t *tm = vnet_get_tcp_main ();
-
- tm->vnet_main = vnet_get_main ();
tm->is_enabled = 0;
-
return 0;
}
VLIB_INIT_FUNCTION (tcp_init);
-
static clib_error_t *
tcp_config_fn (vlib_main_t * vm, unformat_input_t * input)
{
diff --git a/src/vnet/tcp/tcp.h b/src/vnet/tcp/tcp.h
index 4fa681f8cc1..997df76f545 100644
--- a/src/vnet/tcp/tcp.h
+++ b/src/vnet/tcp/tcp.h
@@ -369,6 +369,8 @@ typedef struct _tcp_main
/** per-worker tx buffer free lists */
u32 **tx_buffers;
+ /** per-worker tx frames to 4/6 output nodes */
+ vlib_frame_t **tx_frames[2];
/* Per worker-thread timer wheel for connections timers */
tw_timer_wheel_16t_2w_512sl_t *timer_wheels;
@@ -400,11 +402,8 @@ typedef struct _tcp_main
u32 last_v6_address_rotor;
ip6_address_t *ip6_src_addresses;
- /* convenience */
- vlib_main_t *vlib_main;
- vnet_main_t *vnet_main;
- ip4_main_t *ip4_main;
- ip6_main_t *ip6_main;
+ /** Port allocator random number generator seed */
+ u32 port_allocator_seed;
} tcp_main_t;
extern tcp_main_t tcp_main;
@@ -493,6 +492,8 @@ void tcp_send_fin (tcp_connection_t * tc);
void tcp_init_mss (tcp_connection_t * tc);
void tcp_update_snd_mss (tcp_connection_t * tc);
void tcp_update_rto (tcp_connection_t * tc);
+void tcp_flush_frame_to_output (vlib_main_t * vm, u8 thread_index, u8 is_ip4);
+void tcp_flush_frames_to_output (u8 thread_index);
always_inline u32
tcp_end_seq (tcp_header_t * th, u32 len)
@@ -614,6 +615,7 @@ tcp_update_time (f64 now, u32 thread_index)
{
tw_timer_expire_timers_16t_2w_512sl (&tcp_main.timer_wheels[thread_index],
now);
+ tcp_flush_frames_to_output (thread_index);
}
u32 tcp_push_header (transport_connection_t * tconn, vlib_buffer_t * b);
diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c
index 6c59d70f072..29f4f08d72c 100644
--- a/src/vnet/tcp/tcp_input.c
+++ b/src/vnet/tcp/tcp_input.c
@@ -1751,6 +1751,8 @@ tcp46_established_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
errors = session_manager_flush_enqueue_events (my_thread_index);
tcp_established_inc_counter (vm, is_ip4, TCP_ERROR_EVENT_FIFO_FULL, errors);
+ tcp_flush_frame_to_output (vm, my_thread_index, is_ip4);
+
return from_frame->n_vectors;
}
diff --git a/src/vnet/tcp/tcp_output.c b/src/vnet/tcp/tcp_output.c
index ad13493a14c..f8fbb8a9e69 100644
--- a/src/vnet/tcp/tcp_output.c
+++ b/src/vnet/tcp/tcp_output.c
@@ -436,34 +436,41 @@ tcp_init_mss (tcp_connection_t * tc)
tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
}
-#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 int
+tcp_get_free_buffer_index (tcp_main_t * tm, u32 * bidx)
+{
+ 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 = VLIB_FRAME_SIZE;
+ 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);
+ /* buffer shortage, report failure */
+ if (vec_len (my_tx_buffers) == 0)
+ {
+ clib_warning ("out of buffers");
+ return -1;
+ }
+ tm->tx_buffers[thread_index] = my_tx_buffers;
+ }
+ *bidx = my_tx_buffers[_vec_len (my_tx_buffers) - 1];
+ _vec_len (my_tx_buffers) -= 1;
+ return 0;
+}
+
+always_inline void
+tcp_return_buffer (tcp_main_t * tm)
+{
+ 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;
+}
always_inline void
tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
@@ -706,7 +713,9 @@ tcp_send_reset (tcp_connection_t * tc, vlib_buffer_t * pkt, u8 is_ip4)
ip4_header_t *ih4, *pkt_ih4;
ip6_header_t *ih6, *pkt_ih6;
- tcp_get_free_buffer_index (tm, &bi);
+ if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
+ return;
+
b = vlib_get_buffer (vm, bi);
/* Leave enough space for headers */
@@ -811,7 +820,9 @@ tcp_send_syn (tcp_connection_t * tc)
u16 initial_wnd;
tcp_options_t snd_opts;
- tcp_get_free_buffer_index (tm, &bi);
+ if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
+ return;
+
b = vlib_get_buffer (vm, bi);
/* Leave enough space for headers */
@@ -854,8 +865,11 @@ tcp_send_syn (tcp_connection_t * tc)
}
always_inline void
-tcp_enqueue_to_output (vlib_main_t * vm, vlib_buffer_t * b, u32 bi, u8 is_ip4)
+tcp_enqueue_to_output_i (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
+ u8 is_ip4, u8 flush)
{
+ tcp_main_t *tm = vnet_get_tcp_main ();
+ u32 thread_index = vlib_get_thread_index ();
u32 *to_next, next_index;
vlib_frame_t *f;
@@ -872,12 +886,62 @@ tcp_enqueue_to_output (vlib_main_t * vm, vlib_buffer_t * b, u32 bi, u8 is_ip4)
b->pre_data[1] = next_index;
}
- /* Enqueue the packet */
- f = vlib_get_frame_to_node (vm, next_index);
+ /* Get frame to v4/6 output node */
+ f = tm->tx_frames[!is_ip4][thread_index];
+ if (!f)
+ {
+ f = vlib_get_frame_to_node (vm, next_index);
+ ASSERT (f);
+ tm->tx_frames[!is_ip4][thread_index] = f;
+ }
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);
+ tm->tx_frames[!is_ip4][thread_index] = 0;
+ }
+}
+
+always_inline void
+tcp_enqueue_to_output (vlib_main_t * vm, vlib_buffer_t * b, u32 bi, u8 is_ip4)
+{
+ tcp_enqueue_to_output_i (vm, b, bi, is_ip4, 0);
+}
+
+always_inline void
+tcp_enqueue_to_output_now (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
+ u8 is_ip4)
+{
+ tcp_enqueue_to_output_i (vm, b, bi, is_ip4, 1);
+}
+
+/**
+ * Flush tx frame populated by retransmits and timer pops
+ */
+void
+tcp_flush_frame_to_output (vlib_main_t * vm, u8 thread_index, u8 is_ip4)
+{
+ if (tcp_main.tx_frames[!is_ip4][thread_index])
+ {
+ u32 next_index;
+ next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
+ vlib_put_frame_to_node (vm, next_index,
+ tcp_main.tx_frames[!is_ip4][thread_index]);
+ tcp_main.tx_frames[!is_ip4][thread_index] = 0;
+ }
+}
+
+/**
+ * Flush both v4 and v6 tx frames for thread index
+ */
+void
+tcp_flush_frames_to_output (u8 thread_index)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ tcp_flush_frame_to_output (vm, thread_index, 1);
+ tcp_flush_frame_to_output (vm, thread_index, 0);
}
/**
@@ -891,14 +955,15 @@ tcp_send_fin (tcp_connection_t * tc)
tcp_main_t *tm = vnet_get_tcp_main ();
vlib_main_t *vm = vlib_get_main ();
- tcp_get_free_buffer_index (tm, &bi);
+ if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
+ return;
b = vlib_get_buffer (vm, bi);
/* Leave enough space for headers */
vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
tcp_make_fin (tc, b);
- tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
+ tcp_enqueue_to_output_now (vm, b, bi, tc->c_is_ip4);
tc->flags |= TCP_CONN_FINSNT;
tcp_retransmit_timer_force_update (tc);
TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
@@ -981,7 +1046,8 @@ tcp_send_ack (tcp_connection_t * tc)
u32 bi;
/* Get buffer */
- tcp_get_free_buffer_index (tm, &bi);
+ if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
+ return;
b = vlib_get_buffer (vm, bi);
/* Fill in the ACK */
@@ -1108,7 +1174,9 @@ tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
/* Go back to first un-acked byte */
tc->snd_nxt = tc->snd_una;
- tcp_get_free_buffer_index (tm, &bi);
+ if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
+ return;
+
b = vlib_get_buffer (vm, bi);
if (tc->state >= TCP_STATE_ESTABLISHED)
@@ -1116,6 +1184,7 @@ tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
/* Lost FIN, retransmit and return */
if (tc->flags & TCP_CONN_FINSNT)
{
+ tcp_return_buffer (tm);
tcp_send_fin (tc);
return;
}
@@ -1143,6 +1212,7 @@ tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
tcp_retransmit_timer_set (tc);
ASSERT (0 || (tc->rto_boff > 1
&& tc->snd_una == tc->snd_congestion));
+ tcp_return_buffer (tm);
return;
}
@@ -1164,6 +1234,7 @@ tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
clib_warning ("could not remove half-open connection");
ASSERT (0);
}
+ tcp_return_buffer (tm);
return;
}
@@ -1185,6 +1256,7 @@ tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
{
ASSERT (tc->state == TCP_STATE_CLOSED);
clib_warning ("connection closed ...");
+ tcp_return_buffer (tm);
return;
}
@@ -1254,7 +1326,9 @@ tcp_timer_persist_handler (u32 index)
tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
/* Try to force the first unsent segment */
- tcp_get_free_buffer_index (tm, &bi);
+ if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
+ return;
+
b = vlib_get_buffer (vm, bi);
tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
@@ -1300,7 +1374,9 @@ tcp_retransmit_first_unacked (tcp_connection_t * tc)
tc->snd_nxt = tc->snd_una;
/* Get buffer */
- tcp_get_free_buffer_index (tm, &bi);
+ if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
+ return;
+
b = vlib_get_buffer (vm, bi);
TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
@@ -1344,9 +1420,10 @@ tcp_fast_retransmit_sack (tcp_connection_t * tc)
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);
+ if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
+ return;
+ b = vlib_get_buffer (vm, bi);
hole = scoreboard_next_rxt_hole (sb, hole,
tcp_fastrecovery_sent_1_smss (tc),
&can_rescue, &snd_limited);
@@ -1414,9 +1491,9 @@ tcp_fast_retransmit_no_sack (tcp_connection_t * tc)
while (snd_space > 0)
{
- tcp_get_free_buffer_index (tm, &bi);
+ if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
+ return;
b = vlib_get_buffer (vm, bi);
-
offset += n_written;
n_written = tcp_prepare_retransmit_segment (tc, b, offset, snd_space);
@@ -1506,32 +1583,21 @@ tcp46_output_inline (vlib_main_t * vm,
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,
- 1);
- 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;
+ 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;
- 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;
+ 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;
- ASSERT (!bogus);
}
/* Filter out DUPACKs if there are no OOO segments left */