There are two sensible ways to represent the 6 DSCP bits of an IP
packet. One could represent them as an integer in the range 0 to
63. Or one could represent them as they would appear in the tos
field (0 to 63) << 2. Before this patch, OVS had used the former
method for the DSCP bits in the Queue Table, and the latter for the
DSCP in the Controller and Manager tables. Since the ability to
set DSCP bits in the Controller and Manager tables is so new that
it hasn't been released yet, this patch changes it to use the
existing style employed in the Queue table. Hopefully this should
make the code and configuration less confusing.
Signed-off-by: Ethan Jackson <et...@nicira.com>
---
lib/socket-util.c | 36 ++++++++++++++++++++++++------------
lib/socket-util.h | 4 ++--
ovsdb/ovsdb-server.c | 41 +++++++++++++++--------------------------
vswitchd/bridge.c | 10 +++++++---
vswitchd/vswitch.xml | 38 +++++++++++++++++++-------------------
5 files changed, 67 insertions(+), 62 deletions(-)
diff --git a/lib/socket-util.c b/lib/socket-util.c
index aebc147..563f87d 100644
--- a/lib/socket-util.c
+++ b/lib/socket-util.c
@@ -17,6 +17,7 @@
#include <config.h>
#include "socket-util.h"
#include <arpa/inet.h>
+#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <net/if.h>
@@ -81,6 +82,17 @@ set_nonblocking(int fd)
}
}
+static int
+set_dscp(int fd, uint8_t dscp)
+{
+ assert(dscp <= 63);
+ dscp = dscp << 2;
+ if (setsockopt(fd, IPPROTO_IP, IP_TOS, &dscp, sizeof dscp)) {
+ return errno;
+ }
+ return 0;
+}
+
static bool
rlim_is_finite(rlim_t limit)
{
@@ -573,12 +585,12 @@ inet_open_active(int style, const char *target, uint16_t
default_port,
goto exit_close;
}
- /* The socket options set here ensure that the TOS bits are set during
- * the connection establishment. If set after connect(), the handshake
- * SYN frames will be sent with a TOS of 0. */
- if (setsockopt(fd, IPPROTO_IP, IP_TOS, &dscp, sizeof dscp)) {
- VLOG_ERR("%s: socket: %s", target, strerror(errno));
- error = errno;
+ /* The dscp bits must be configured before connect() to ensure that the TOS
+ * field is set during the connection establishment. If set after
+ * connect(), the handshake SYN frames will be sent with a TOS of 0. */
+ error = set_dscp(fd, dscp);
+ if (error) {
+ VLOG_ERR("%s: socket: %s", target, strerror(error));
goto exit_close;
}
@@ -714,12 +726,12 @@ inet_open_passive(int style, const char *target, int
default_port,
goto error;
}
- /* The socket options set here ensure that the TOS bits are set during
- * the connection establishment. If set after connect(), the handshake
- * SYN frames will be sent with a TOS of 0. */
- if (setsockopt(fd, IPPROTO_IP, IP_TOS, &dscp, sizeof dscp)) {
- VLOG_ERR("%s: socket: %s", target, strerror(errno));
- error = errno;
+ /* The dscp bits must be configured before connect() to ensure that the TOS
+ * field is set during the connection establishment. If set after
+ * connect(), the handshake SYN frames will be sent with a TOS of 0. */
+ error = set_dscp(fd, dscp);
+ if (error) {
+ VLOG_ERR("%s: socket: %s", target, strerror(error));
goto error;
}
diff --git a/lib/socket-util.h b/lib/socket-util.h
index 07c9327..a2fa71b 100644
--- a/lib/socket-util.h
+++ b/lib/socket-util.h
@@ -66,7 +66,7 @@ char *describe_fd(int fd);
/* Default value of dscp bits for connection between controller and manager.
* Value of IPTOS_PREC_INTERNETCONTROL = 0xc0 which is defined
- * in <netinet/ip.h> is used. */
-#define DSCP_DEFAULT IPTOS_PREC_INTERNETCONTROL
+ * in <netinet/ip.h> is used. */
+#define DSCP_DEFAULT IPTOS_PREC_INTERNETCONTROL >> 2
#endif /* socket-util.h */
diff --git a/ovsdb/ovsdb-server.c b/ovsdb/ovsdb-server.c
index 6994018..d8363a2 100644
--- a/ovsdb/ovsdb-server.c
+++ b/ovsdb/ovsdb-server.c
@@ -319,12 +319,11 @@ get_datum(struct ovsdb_row *row, const char *column_name,
return &row->fields[column->index];
}
-/* This function is used to read the string-string key-values from a map.
- * Returns the true if the 'key' is found and returns the "value" associated
- * with the 'key' in 'stringp', else returns false. */
-static bool
+/* Read string-string key-values from a map. Returns the value associated with
+ * 'key', if found, or NULL */
+static const char *
read_map_string_column(const struct ovsdb_row *row, const char *column_name,
- const char **stringp, const char *key)
+ const char *key)
{
const struct ovsdb_datum *datum;
union ovsdb_atom *atom_key = NULL, *atom_value = NULL;
@@ -334,8 +333,7 @@ read_map_string_column(const struct ovsdb_row *row, const
char *column_name,
OVSDB_TYPE_STRING, UINT_MAX);
if (!datum) {
- *stringp = NULL;
- return false;
+ return NULL;
}
for (i = 0; i < datum->n; i++) {
@@ -346,8 +344,7 @@ read_map_string_column(const struct ovsdb_row *row, const
char *column_name,
}
}
- *stringp = atom_value ? atom_value->string : NULL;
- return atom_value != NULL;
+ return atom_value ? atom_value->string : NULL;
}
static const union ovsdb_atom *
@@ -427,21 +424,6 @@ write_string_string_column(struct ovsdb_row *row, const
char *column_name,
ovsdb_datum_sort_assert(datum, column->type.key.type);
}
-/* Get the other config for the manager from the database. */
-static void
-manager_get_other_config(const struct ovsdb_row *row,
- struct ovsdb_jsonrpc_options *options)
-{
- const char *temp_string;
-
- /* Retrieve the configs and store in the options. */
- if (read_map_string_column(row, "other_config", &temp_string, "dscp")) {
- options->dscp = atoi(temp_string);
- } else {
- options->dscp = DSCP_DEFAULT;
- }
-}
-
/* Adds a remote and options to 'remotes', based on the Manager table row in
* 'row'. */
static void
@@ -450,7 +432,7 @@ add_manager_options(struct shash *remotes, const struct
ovsdb_row *row)
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
struct ovsdb_jsonrpc_options *options;
long long int max_backoff, probe_interval;
- const char *target;
+ const char *target, *dscp_string;
if (!read_string_column(row, "target", &target) || !target) {
VLOG_INFO_RL(&rl, "Table `%s' has missing or invalid `target' column",
@@ -466,7 +448,14 @@ add_manager_options(struct shash *remotes, const struct
ovsdb_row *row)
options->probe_interval = probe_interval;
}
- manager_get_other_config(row, options);
+ options->dscp = DSCP_DEFAULT;
+ dscp_string = read_map_string_column(row, "other_config", "dscp");
+ if (dscp_string) {
+ int dscp = atoi(dscp_string);
+ if (dscp >= 0 && dscp <= 63) {
+ options->dscp = dscp;
+ }
+ }
}
static void
diff --git a/vswitchd/bridge.c b/vswitchd/bridge.c
index 22a3706..74cba87 100644
--- a/vswitchd/bridge.c
+++ b/vswitchd/bridge.c
@@ -2436,10 +2436,14 @@ bridge_ofproto_controller_from_ovsrec(const struct
ovsrec_controller *c,
oc->enable_async_msgs = (!c->enable_async_messages
|| *c->enable_async_messages);
config_str = ovsrec_controller_get_other_config_value(c, "dscp", NULL);
+
+ oc->dscp = DSCP_DEFAULT;
if (config_str) {
- oc->dscp = atoi(config_str);
- } else {
- oc->dscp = DSCP_DEFAULT;
+ int dscp = atoi(config_str);
+
+ if (dscp >= 0 && dscp <= 63) {
+ oc->dscp = dscp;
+ }
}
}
diff --git a/vswitchd/vswitch.xml b/vswitchd/vswitch.xml
index 1128db9..ef01974 100644
--- a/vswitchd/vswitch.xml
+++ b/vswitchd/vswitch.xml
@@ -2698,16 +2698,16 @@
<column name="other_config" key="dscp"
type='{"type": "integer"}'>
- The Differentiated Service Code Point (DSCP) is specified in the IP
- header. They are specified using 6 bits in the Type of Service (TOS)
- field in the IP header. DSCP provides a mechanism to classify the
- network traffic and provide the Quality of Service (QoS) on IP
- networks.
- The DSCP value passed is used when establishing the connection between
- the controller and the Open vSwitch. The connection must be reset
- for the new DSCP values to take effect. If no value is
- specified, a default value of 192 is chosen for connection
- establishment. Valid DSCP values must have their lower 2 bits set to
0.
+ The Differentiated Service Code Point (DSCP) is specified using 6 bits
+ in the Type of Service (TOS) field in the IP header. DSCP provides a
+ mechanism to classify the network traffic and provide Quality of
+ Service (QoS) on IP networks.
+
+ The DSCP value specified here is used when establishing the connection
+ between the controller and the Open vSwitch. The connection must be
+ reset for the new DSCP values to take effect. If no value is
+ specified, a default value of 48 is chosen. Valid DSCP values must be
+ in the range 0 to 63.
</column>
</group>
@@ -2945,16 +2945,16 @@
<column name="other_config" key="dscp"
type='{"type": "integer"}'>
- The Differentiated Service Code Point (DSCP) is specified in the IP
- header. They are specified using 6 bits in the Type of Service (TOS)
- field in the IP header. DSCP provides a mechanism to classify the
- network traffic and provide the Quality of Service (QoS) on IP
- networks.
- The DSCP value passed when establishing the connection between
- the manager and the Open vSwitch Database. The connection must be
+ The Differentiated Service Code Point (DSCP) is specified using 6 bits
+ in the Type of Service (TOS) field in the IP header. DSCP provides a
+ mechanism to classify the network traffic and provide Quality of
+ Service (QoS) on IP networks.
+
+ The DSCP value specified here is used when establishing the connection
+ between the manager and the Open vSwitch. The connection must be
reset for the new DSCP values to take effect. If no value is
- specified, a default value of 192 is chosen for connection
- establishment. Valid DSCP values must have their lower 2 bits set to
0.
+ specified, a default value of 48 is chosen. Valid DSCP values must be
+ in the range 0 to 63.
</column>
</group>
--
1.7.9.6
_______________________________________________
dev mailing list
dev@openvswitch.org
http://openvswitch.org/mailman/listinfo/dev
