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-rw-r--r--Documentation/networking/dccp.txt10
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/networking/dccp.txt b/Documentation/networking/dccp.txt
index 387482e46c4..4504cc59e40 100644
--- a/Documentation/networking/dccp.txt
+++ b/Documentation/networking/dccp.txt
@@ -57,6 +57,16 @@ DCCP_SOCKOPT_SEND_CSCOV is for the receiver and has a different meaning: it
coverage value are also acceptable. The higher the number, the more
restrictive this setting (see [RFC 4340, sec. 9.2.1]).
+The following two options apply to CCID 3 exclusively and are getsockopt()-only.
+In either case, a TFRC info struct (defined in <linux/tfrc.h>) is returned.
+DCCP_SOCKOPT_CCID_RX_INFO
+ Returns a `struct tfrc_rx_info' in optval; the buffer for optval and
+ optlen must be set to at least sizeof(struct tfrc_rx_info).
+DCCP_SOCKOPT_CCID_TX_INFO
+ Returns a `struct tfrc_tx_info' in optval; the buffer for optval and
+ optlen must be set to at least sizeof(struct tfrc_tx_info).
+
+
Sysctl variables
================
Several DCCP default parameters can be managed by the following sysctls