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authorDave Barach <dave@barachs.net>2019-09-09 16:38:17 -0400
committerDave Barach <dave@barachs.net>2019-09-10 15:20:08 -0400
commit4b943d632864949310da4c88ea00e59f6043ae40 (patch)
tree0d88295ff7420659dcd25ad79a39dea1cc41c967 /src/vnet
parent1dafb7fd83b36640557be41e6aa2ea95e663c40b (diff)
misc: clean up "pcap [rx|tx] trace" debug CLI
Separate debug CLI arg parsing from the underlying action function. Fixes a number of subtle ordering dependencies, and will allow us to add a binary API to control the feature at some point in the future. Type: refactor Ticket: VPP-1770 Signed-off-by: Dave Barach <dave@barachs.net> Change-Id: Id0dbeda06dad20e756c941c691e2088ce3c50ec7 (cherry picked from commit b97641c79f4aaf0069268c550f263167ddea2b34)
Diffstat (limited to 'src/vnet')
-rw-r--r--src/vnet/interface.h12
-rw-r--r--src/vnet/interface_cli.c316
2 files changed, 161 insertions, 167 deletions
diff --git a/src/vnet/interface.h b/src/vnet/interface.h
index d3065dc2a9f..a6488447dc1 100644
--- a/src/vnet/interface.h
+++ b/src/vnet/interface.h
@@ -893,6 +893,18 @@ void vnet_register_format_buffer_opaque_helper
void vnet_register_format_buffer_opaque2_helper
(vnet_buffer_opquae_formatter_t fn);
+typedef struct
+{
+ u8 *filename;
+ int enable;
+ int status;
+ u32 packets_to_capture;
+ vlib_rx_or_tx_t rxtx;
+ u32 sw_if_index;
+} vnet_pcap_dispatch_trace_args_t;
+
+int vnet_pcap_dispatch_trace_configure (vnet_pcap_dispatch_trace_args_t *);
+
#endif /* included_vnet_interface_h */
/*
diff --git a/src/vnet/interface_cli.c b/src/vnet/interface_cli.c
index 437854476b4..00df77fd4a0 100644
--- a/src/vnet/interface_cli.c
+++ b/src/vnet/interface_cli.c
@@ -1695,19 +1695,108 @@ VLIB_CLI_COMMAND (cmd_set_if_rx_placement,static) = {
};
/* *INDENT-ON* */
-static inline clib_error_t *
+int
+vnet_pcap_dispatch_trace_configure (vnet_pcap_dispatch_trace_args_t * a)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ vlib_rx_or_tx_t rxtx = a->rxtx;
+ vnet_pcap_t *pp = &vm->pcap[rxtx];
+ pcap_main_t *pm = &pp->pcap_main;
+
+ if (a->status)
+ {
+ if (pp->pcap_enable == 0)
+ {
+ vlib_cli_output
+ (vm, "pcap %s dispatch capture enabled: %d of %d pkts...",
+ (rxtx == VLIB_RX) ? "rx" : "tx",
+ pm->n_packets_captured, pm->n_packets_to_capture);
+ vlib_cli_output (vm, "capture to file %s", pm->file_name);
+ }
+ else
+ vlib_cli_output (vm, "pcap %s dispatch capture disabled",
+ (rxtx == VLIB_RX) ? "rx" : "tx");
+ return 0;
+ }
+
+ /* Consistency checks */
+
+ /* Enable w/ capture already enabled not allowed */
+ if (pp->pcap_enable && a->enable)
+ return VNET_API_ERROR_INVALID_VALUE;
+
+ /* Disable capture with capture already disabled, not interesting */
+ if (pp->pcap_enable == 0 && a->enable == 0)
+ return VNET_API_ERROR_VALUE_EXIST;
+
+ /* Change number of packets to capture while capturing */
+ if (pp->pcap_enable && a->enable
+ && (pm->n_packets_to_capture != a->packets_to_capture))
+ return VNET_API_ERROR_INVALID_VALUE_2;
+
+ if (a->enable)
+ {
+ /* Clean up from previous run, if any */
+ vec_free (pm->file_name);
+ vec_free (pm->pcap_data);
+ memset (pm, 0, sizeof (*pm));
+
+ vec_validate_aligned (vnet_trace_dummy, 2048, CLIB_CACHE_LINE_BYTES);
+ if (pm->lock == 0)
+ clib_spinlock_init (&(pm->lock));
+
+ if (a->filename == 0)
+ a->filename = format (0, "/tmp/%s.pcap%c",
+ (rxtx == VLIB_RX) ? "rx" : "tx", 0);
+
+ pm->file_name = (char *) a->filename;
+ pm->n_packets_captured = 0;
+ pm->packet_type = PCAP_PACKET_TYPE_ethernet;
+ pm->n_packets_to_capture = a->packets_to_capture;
+ pp->pcap_sw_if_index = a->sw_if_index;
+ pp->pcap_enable = 1;
+ }
+ else
+ {
+ pp->pcap_enable = 0;
+ if (pm->n_packets_captured)
+ {
+ clib_error_t *error;
+ pm->n_packets_to_capture = pm->n_packets_captured;
+ vlib_cli_output (vm, "Write %d packets to %s, and stop capture...",
+ pm->n_packets_captured, pm->file_name);
+ error = pcap_write (pm);
+ if (pm->file_descriptor >= 0)
+ pcap_close (pm);
+ /* Report I/O errors... */
+ if (error)
+ {
+ clib_error_report (error);
+ return VNET_API_ERROR_SYSCALL_ERROR_1;
+ }
+ return 0;
+ }
+ else
+ return VNET_API_ERROR_NO_SUCH_ENTRY;
+ }
+
+ return 0;
+}
+
+static clib_error_t *
pcap_trace_command_internal (vlib_main_t * vm,
unformat_input_t * input,
- vlib_cli_command_t * cmd, int rx_tx)
+ vlib_cli_command_t * cmd, vlib_rx_or_tx_t rxtx)
{
unformat_input_t _line_input, *line_input = &_line_input;
- u8 *filename;
- u8 *chroot_filename = 0;
- u32 max = 0;
- int enabled = 0;
- int errorFlag = 0;
- clib_error_t *error = 0;
+ vnet_pcap_dispatch_trace_args_t _a, *a = &_a;
vnet_main_t *vnm = vnet_get_main ();
+ u8 *filename = 0;
+ u32 max = 1000;
+ int rv;
+ int enable = 0;
+ int status = 0;
+ u32 sw_if_index = 0;
/* Get a line of input. */
if (!unformat_user (input, unformat_line_input, line_input))
@@ -1715,179 +1804,73 @@ pcap_trace_command_internal (vlib_main_t * vm,
while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
{
- if (unformat (line_input, "on"))
- {
- if (vm->pcap[rx_tx].pcap_enable == 0)
- {
- enabled = 1;
- vm->pcap[rx_tx].pcap_main.n_packets_to_capture =
- PCAP_DEF_PKT_TO_CAPTURE;
- }
- else
- {
- vlib_cli_output (vm, "pcap %s capture already on...",
- (rx_tx == VLIB_RX) ? "rx" : "tx");
- errorFlag = 1;
- break;
- }
- }
- else if (unformat (line_input, "off"))
- {
- if (vm->pcap[rx_tx].pcap_enable)
- {
- vlib_cli_output
- (vm, "captured %d pkts...",
- vm->pcap[rx_tx].pcap_main.n_packets_captured);
- if (vm->pcap[rx_tx].pcap_main.n_packets_captured)
- {
- vm->pcap[rx_tx].pcap_main.n_packets_to_capture =
- vm->pcap[rx_tx].pcap_main.n_packets_captured;
- error = pcap_write (&vm->pcap[rx_tx].pcap_main);
- if (error)
- clib_error_report (error);
- else
- vlib_cli_output (vm, "saved to %s...",
- vm->pcap[rx_tx].pcap_main.file_name);
- }
-
- vm->pcap[rx_tx].pcap_enable = 0;
- }
- else
- {
- vlib_cli_output (vm, "pcap %s capture already off...",
- (rx_tx == VLIB_RX) ? "rx" : "tx");
- errorFlag = 1;
- break;
- }
- }
+ if (unformat (line_input, "on %=", &enable, 1))
+ ;
+ else if (unformat (line_input, "enable %=", &enable, 1))
+ ;
+ else if (unformat (line_input, "off %=", &enable, 0))
+ ;
+ else if (unformat (line_input, "disable %=", &enable, 0))
+ ;
else if (unformat (line_input, "max %d", &max))
- {
- if (vm->pcap[rx_tx].pcap_enable)
- {
- vlib_cli_output
- (vm,
- "can't change max value while pcap tx capture active...");
- errorFlag = 1;
- break;
- }
- vm->pcap[rx_tx].pcap_main.n_packets_to_capture = max;
- }
+ ;
+ else if (unformat (line_input, "packets-to-capture %d", &max))
+ ;
+ else if (unformat (line_input, "file %U", unformat_vlib_tmpfile,
+ &filename))
+ ;
+ else if (unformat (line_input, "status %=", &status, 1))
+ ;
else if (unformat (line_input, "intfc %U",
- unformat_vnet_sw_interface, vnm,
- &vm->pcap[rx_tx].pcap_sw_if_index))
+ unformat_vnet_sw_interface, vnm, &sw_if_index))
;
-
else if (unformat (line_input, "intfc any"))
- {
- vm->pcap[rx_tx].pcap_sw_if_index = 0;
- }
- else if (unformat (line_input, "file %s", &filename))
- {
- if (vm->pcap[rx_tx].pcap_enable)
- {
- vlib_cli_output
- (vm, "can't change file while pcap tx capture active...");
- errorFlag = 1;
- break;
- }
-
- /* Brain-police user path input */
- if (strstr ((char *) filename, "..")
- || index ((char *) filename, '/'))
- {
- vlib_cli_output (vm, "illegal characters in filename '%s'",
- filename);
- vlib_cli_output (vm, "Hint: .. and / are not allowed.");
- vec_free (filename);
- errorFlag = 1;
- break;
- }
-
- chroot_filename = format (0, "/tmp/%s%c", filename, 0);
- vec_free (filename);
- }
- else if (unformat (line_input, "status"))
- {
- if (vm->pcap[rx_tx].pcap_sw_if_index == 0)
- {
- vlib_cli_output
- (vm, "max is %d for any interface to file %s",
- vm->pcap[rx_tx].pcap_main.n_packets_to_capture,
- vm->pcap[rx_tx].pcap_main.file_name ?
- (u8 *) vm->pcap[rx_tx].pcap_main.file_name :
- (u8 *) "/tmp/vpe.pcap");
- }
- else
- {
- vlib_cli_output (vm, "max is %d for interface %U to file %s",
- vm->pcap[rx_tx].pcap_main.n_packets_to_capture,
- format_vnet_sw_if_index_name, vnm,
- vm->pcap[rx_tx].pcap_sw_if_index,
- vm->pcap[rx_tx].
- pcap_main.file_name ? (u8 *) vm->pcap[rx_tx].
- pcap_main.file_name : (u8 *) "/tmp/vpe.pcap");
- }
-
- if (vm->pcap[rx_tx].pcap_enable == 0)
- {
- vlib_cli_output (vm, "pcap %s capture is off...",
- (rx_tx == VLIB_RX) ? "rx" : "tx");
- }
- else
- {
- vlib_cli_output (vm, "pcap %s capture is on: %d of %d pkts...",
- (rx_tx == VLIB_RX) ? "rx" : "tx",
- vm->pcap[rx_tx].pcap_main.n_packets_captured,
- vm->pcap[rx_tx].
- pcap_main.n_packets_to_capture);
- }
- break;
- }
-
+ sw_if_index = 0;
else
{
- error = clib_error_return (0, "unknown input `%U'",
- format_unformat_error, line_input);
- errorFlag = 1;
- break;
+ return clib_error_return (0, "unknown input `%U'",
+ format_unformat_error, line_input);
}
}
+
unformat_free (line_input);
+ /* no need for memset (a, 0, sizeof (*a)), set all fields here. */
+ a->filename = filename;
+ a->enable = enable;
+ a->status = status;
+ a->packets_to_capture = max;
+ a->rxtx = rxtx;
+ a->sw_if_index = sw_if_index;
+
+ rv = vnet_pcap_dispatch_trace_configure (a);
- if (errorFlag == 0)
+ switch (rv)
{
- /* Since no error, save configured values. */
- if (chroot_filename)
- {
- if (vm->pcap[rx_tx].pcap_main.file_name)
- vec_free (vm->pcap[rx_tx].pcap_main.file_name);
- vec_add1 (chroot_filename, 0);
- vm->pcap[rx_tx].pcap_main.file_name = (char *) chroot_filename;
- }
+ case 0:
+ break;
- if (max)
- vm->pcap[rx_tx].pcap_main.n_packets_to_capture = max;
+ case VNET_API_ERROR_INVALID_VALUE:
+ return clib_error_return (0, "dispatch trace already enabled...");
- if (enabled)
- {
- if (vm->pcap[rx_tx].pcap_main.file_name == 0)
- vm->pcap[rx_tx].pcap_main.file_name
- = (char *) format (0, "/tmp/vpe.pcap%c", 0);
-
- vm->pcap[rx_tx].pcap_main.n_packets_captured = 0;
- vm->pcap[rx_tx].pcap_main.packet_type = PCAP_PACKET_TYPE_ethernet;
- if (vm->pcap[rx_tx].pcap_main.lock == 0)
- clib_spinlock_init (&(vm->pcap[rx_tx].pcap_main.lock));
- vm->pcap[rx_tx].pcap_enable = 1;
- vlib_cli_output (vm, "pcap %s capture on...",
- rx_tx == VLIB_RX ? "rx" : "tx");
- }
- }
- else if (chroot_filename)
- vec_free (chroot_filename);
+ case VNET_API_ERROR_VALUE_EXIST:
+ return clib_error_return (0, "dispatch trace already disabled...");
- return error;
+ case VNET_API_ERROR_INVALID_VALUE_2:
+ return clib_error_return
+ (0, "can't change number of records to capture while tracing...");
+
+ case VNET_API_ERROR_SYSCALL_ERROR_1:
+ return clib_error_return (0, "I/O writing trace capture...");
+
+ case VNET_API_ERROR_NO_SUCH_ENTRY:
+ return clib_error_return (0, "No packets captured...");
+
+ default:
+ vlib_cli_output (vm, "WARNING: trace configure returned %d", rv);
+ break;
+ }
+ return 0;
}
static clib_error_t *
@@ -1904,7 +1887,6 @@ pcap_tx_trace_command_fn (vlib_main_t * vm,
return pcap_trace_command_internal (vm, input, cmd, VLIB_TX);
}
-
/*?
* This command is used to start or stop a packet capture, or show
* the status of packet capture. Note that both "pcap rx trace" and