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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2008-09-04 07:30:19 +0200
committerGerrit Renker <gerrit@erg.abdn.ac.uk>2008-09-04 07:45:28 +0200
commit17c30b40ed79e9f3955e884632c8f01e577b204a (patch)
tree41b91885f808f0b1d48b8b87a303ea7891565a46
parent20f41eee82864e308a5499308a1722dc3181cc3a (diff)
downloadop-kernel-dev-17c30b40ed79e9f3955e884632c8f01e577b204a.zip
op-kernel-dev-17c30b40ed79e9f3955e884632c8f01e577b204a.tar.gz
dccp: Deprecate Ack Ratio sysctl
This patch deprecates the Ack Ratio sysctl, since * Ack Ratio is entirely ignored by CCID-3 and CCID-4, * Ack Ratio currently doesn't work in CCID-2 (i.e. is always set to 1); * even if it would work in CCID-2, there is no point for a user to change it: - Ack Ratio is constrained by cwnd (RFC 4341, 6.1.2), - if Ack Ratio > cwnd, the system resorts to spurious RTO timeouts (since waiting for Acks which will never arrive in this window), - cwnd is not a user-configurable value. The only reasonable place for Ack Ratio is to print it for debugging. It is planned to do this later on, as part of e.g. dccp_probe. With this patch Ack Ratio is now under full control of feature negotiation: * Ack Ratio is resolved as a dependency of the selected CCID; * if the chosen CCID supports it (i.e. CCID == CCID-2), Ack Ratio is set to the default of 2, following RFC 4340, 11.3 - "New connections start with Ack Ratio 2 for both endpoints"; * what happens then is part of another patch set, since it concerns the dynamic update of Ack Ratio while the connection is in full flight. Thanks to Tomasz Grobelny for discussion leading up to this patch. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--Documentation/networking/dccp.txt3
-rw-r--r--include/linux/dccp.h2
-rw-r--r--net/dccp/dccp.h1
-rw-r--r--net/dccp/minisocks.c1
-rw-r--r--net/dccp/options.c1
-rw-r--r--net/dccp/sysctl.c7
6 files changed, 0 insertions, 15 deletions
diff --git a/Documentation/networking/dccp.txt b/Documentation/networking/dccp.txt
index f0aeb20..43df448 100644
--- a/Documentation/networking/dccp.txt
+++ b/Documentation/networking/dccp.txt
@@ -125,9 +125,6 @@ send_ndp = 1
send_ackvec = 1
Whether or not to send Ack Vector options (sec. 11.5).
-ack_ratio = 2
- The default Ack Ratio (sec. 11.3) to use.
-
tx_ccid = 2
Default CCID for the sender-receiver half-connection.
diff --git a/include/linux/dccp.h b/include/linux/dccp.h
index 5a5a899..eda389c 100644
--- a/include/linux/dccp.h
+++ b/include/linux/dccp.h
@@ -368,7 +368,6 @@ static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
* @dccpms_ccid - Congestion Control Id (CCID) (section 10)
* @dccpms_send_ack_vector - Send Ack Vector Feature (section 11.5)
* @dccpms_send_ndp_count - Send NDP Count Feature (7.7.2)
- * @dccpms_ack_ratio - Ack Ratio Feature (section 11.3)
* @dccpms_pending - List of features being negotiated
* @dccpms_conf -
*/
@@ -378,7 +377,6 @@ struct dccp_minisock {
__u8 dccpms_tx_ccid;
__u8 dccpms_send_ack_vector;
__u8 dccpms_send_ndp_count;
- __u8 dccpms_ack_ratio;
struct list_head dccpms_pending;
struct list_head dccpms_conf;
};
diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
index e656daf..031ce35 100644
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -98,7 +98,6 @@ extern int sysctl_dccp_retries2;
extern int sysctl_dccp_feat_sequence_window;
extern int sysctl_dccp_feat_rx_ccid;
extern int sysctl_dccp_feat_tx_ccid;
-extern int sysctl_dccp_feat_ack_ratio;
extern int sysctl_dccp_feat_send_ack_vector;
extern int sysctl_dccp_feat_send_ndp_count;
extern int sysctl_dccp_tx_qlen;
diff --git a/net/dccp/minisocks.c b/net/dccp/minisocks.c
index e487133..ee7f40f 100644
--- a/net/dccp/minisocks.c
+++ b/net/dccp/minisocks.c
@@ -47,7 +47,6 @@ void dccp_minisock_init(struct dccp_minisock *dmsk)
dmsk->dccpms_sequence_window = sysctl_dccp_feat_sequence_window;
dmsk->dccpms_rx_ccid = sysctl_dccp_feat_rx_ccid;
dmsk->dccpms_tx_ccid = sysctl_dccp_feat_tx_ccid;
- dmsk->dccpms_ack_ratio = sysctl_dccp_feat_ack_ratio;
dmsk->dccpms_send_ack_vector = sysctl_dccp_feat_send_ack_vector;
dmsk->dccpms_send_ndp_count = sysctl_dccp_feat_send_ndp_count;
}
diff --git a/net/dccp/options.c b/net/dccp/options.c
index 67a171a..515ad45 100644
--- a/net/dccp/options.c
+++ b/net/dccp/options.c
@@ -26,7 +26,6 @@
int sysctl_dccp_feat_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW;
int sysctl_dccp_feat_rx_ccid = DCCPF_INITIAL_CCID;
int sysctl_dccp_feat_tx_ccid = DCCPF_INITIAL_CCID;
-int sysctl_dccp_feat_ack_ratio = DCCPF_INITIAL_ACK_RATIO;
int sysctl_dccp_feat_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR;
int sysctl_dccp_feat_send_ndp_count = DCCPF_INITIAL_SEND_NDP_COUNT;
diff --git a/net/dccp/sysctl.c b/net/dccp/sysctl.c
index 2129599..f6e54f4 100644
--- a/net/dccp/sysctl.c
+++ b/net/dccp/sysctl.c
@@ -41,13 +41,6 @@ static struct ctl_table dccp_default_table[] = {
.proc_handler = proc_dointvec,
},
{
- .procname = "ack_ratio",
- .data = &sysctl_dccp_feat_ack_ratio,
- .maxlen = sizeof(sysctl_dccp_feat_ack_ratio),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- {
.procname = "send_ackvec",
.data = &sysctl_dccp_feat_send_ack_vector,
.maxlen = sizeof(sysctl_dccp_feat_send_ack_vector),
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