dccp: Lockless integration of CCID congestion-control plugins
Based on Arnaldo's earlier patch, this patch integrates the standardised CCID congestion control plugins (CCID-2 and CCID-3) of DCCP with dccp.ko: * enables a faster connection path by eliminating the need to always go through the CCID registration lock; * updates the implementation to use only a single array whose size equals the number of configured CCIDs instead of the maximum (256); * since the CCIDs are now fixed array elements, synchronization is no longer needed, simplifying use and implementation. CCID-2 is suggested as minimum for a basic DCCP implementation (RFC 4340, 10); CCID-3 is a standards-track CCID supported by RFC 4342 and RFC 5348. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gerrit Renker
David S. Miller
parent
6ea2fde13a
commit
ddebc973c5
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@ -1,7 +1,6 @@
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menuconfig IP_DCCP
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tristate "The DCCP Protocol (EXPERIMENTAL)"
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depends on INET && EXPERIMENTAL
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select IP_DCCP_CCID2
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---help---
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Datagram Congestion Control Protocol (RFC 4340)
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@ -25,9 +24,6 @@ config INET_DCCP_DIAG
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def_tristate y if (IP_DCCP = y && INET_DIAG = y)
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def_tristate m
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config IP_DCCP_ACKVEC
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bool
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source "net/dccp/ccids/Kconfig"
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menu "DCCP Kernel Hacking"
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@ -2,14 +2,19 @@ obj-$(CONFIG_IP_DCCP) += dccp.o dccp_ipv4.o
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dccp-y := ccid.o feat.o input.o minisocks.o options.o output.o proto.o timer.o
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#
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# CCID algorithms to be used by dccp.ko
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#
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# CCID-2 is default (RFC 4340, p. 77) and has Ack Vectors as dependency
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dccp-y += ccids/ccid2.o ackvec.o
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dccp-$(CONFIG_IP_DCCP_CCID3) += ccids/ccid3.o
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dccp_ipv4-y := ipv4.o
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# build dccp_ipv6 as module whenever either IPv6 or DCCP is a module
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obj-$(subst y,$(CONFIG_IP_DCCP),$(CONFIG_IPV6)) += dccp_ipv6.o
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dccp_ipv6-y := ipv6.o
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dccp-$(CONFIG_IP_DCCP_ACKVEC) += ackvec.o
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obj-$(CONFIG_INET_DCCP_DIAG) += dccp_diag.o
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obj-$(CONFIG_NET_DCCPPROBE) += dccp_probe.o
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@ -84,7 +84,7 @@ struct dccp_ackvec_record {
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struct sock;
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struct sk_buff;
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#ifdef CONFIG_IP_DCCP_ACKVEC
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#ifndef ___OLD_INTERFACE_TO_BE_REMOVED___
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extern int dccp_ackvec_init(void);
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extern void dccp_ackvec_exit(void);
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@ -106,7 +106,7 @@ static inline int dccp_ackvec_pending(const struct dccp_ackvec *av)
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{
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return av->av_vec_len;
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}
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#else /* CONFIG_IP_DCCP_ACKVEC */
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#else /* ___OLD_INTERFACE_TO_BE_REMOVED___ */
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static inline int dccp_ackvec_init(void)
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{
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return 0;
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156
net/dccp/ccid.c
156
net/dccp/ccid.c
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@ -13,6 +13,70 @@
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#include "ccid.h"
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static struct ccid_operations *ccids[] = {
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&ccid2_ops,
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#ifdef CONFIG_IP_DCCP_CCID3
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&ccid3_ops,
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#endif
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};
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static struct ccid_operations *ccid_by_number(const u8 id)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(ccids); i++)
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if (ccids[i]->ccid_id == id)
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return ccids[i];
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return NULL;
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}
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/* check that up to @array_len members in @ccid_array are supported */
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bool ccid_support_check(u8 const *ccid_array, u8 array_len)
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{
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while (array_len > 0)
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if (ccid_by_number(ccid_array[--array_len]) == NULL)
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return false;
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return true;
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}
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/**
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* ccid_get_builtin_ccids - Populate a list of built-in CCIDs
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* @ccid_array: pointer to copy into
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* @array_len: value to return length into
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* This function allocates memory - caller must see that it is freed after use.
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*/
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int ccid_get_builtin_ccids(u8 **ccid_array, u8 *array_len)
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{
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*ccid_array = kmalloc(ARRAY_SIZE(ccids), gfp_any());
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if (*ccid_array == NULL)
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return -ENOBUFS;
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for (*array_len = 0; *array_len < ARRAY_SIZE(ccids); *array_len += 1)
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(*ccid_array)[*array_len] = ccids[*array_len]->ccid_id;
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return 0;
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}
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int ccid_getsockopt_builtin_ccids(struct sock *sk, int len,
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char __user *optval, int __user *optlen)
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{
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u8 *ccid_array, array_len;
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int err = 0;
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if (len < ARRAY_SIZE(ccids))
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return -EINVAL;
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if (ccid_get_builtin_ccids(&ccid_array, &array_len))
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return -ENOBUFS;
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if (put_user(array_len, optlen) ||
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copy_to_user(optval, ccid_array, array_len))
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err = -EFAULT;
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kfree(ccid_array);
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return err;
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}
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#ifdef ___OLD_INTERFACE_TO_BE_REMOVED___
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static u8 builtin_ccids[] = {
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DCCPC_CCID2, /* CCID2 is supported by default */
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#if defined(CONFIG_IP_DCCP_CCID3) || defined(CONFIG_IP_DCCP_CCID3_MODULE)
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@ -62,6 +126,7 @@ static inline void ccids_read_unlock(void)
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#define ccids_read_lock() do { } while(0)
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#define ccids_read_unlock() do { } while(0)
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#endif
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#endif /* ___OLD_INTERFACE_TO_BE_REMOVED___ */
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static struct kmem_cache *ccid_kmem_cache_create(int obj_size, const char *fmt,...)
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{
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@ -93,6 +158,7 @@ static void ccid_kmem_cache_destroy(struct kmem_cache *slab)
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}
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}
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#ifdef ___OLD_INTERFACE_TO_BE_REMOVED___
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/* check that up to @array_len members in @ccid_array are supported */
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bool ccid_support_check(u8 const *ccid_array, u8 array_len)
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{
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@ -133,8 +199,9 @@ int ccid_getsockopt_builtin_ccids(struct sock *sk, int len,
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return -EFAULT;
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return 0;
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}
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#endif /* ___OLD_INTERFACE_TO_BE_REMOVED___ */
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int ccid_register(struct ccid_operations *ccid_ops)
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static int ccid_activate(struct ccid_operations *ccid_ops)
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{
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int err = -ENOBUFS;
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@ -152,79 +219,40 @@ int ccid_register(struct ccid_operations *ccid_ops)
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if (ccid_ops->ccid_hc_tx_slab == NULL)
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goto out_free_rx_slab;
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ccids_write_lock();
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err = -EEXIST;
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if (ccids[ccid_ops->ccid_id] == NULL) {
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ccids[ccid_ops->ccid_id] = ccid_ops;
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err = 0;
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}
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ccids_write_unlock();
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if (err != 0)
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goto out_free_tx_slab;
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pr_info("CCID: Registered CCID %d (%s)\n",
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pr_info("CCID: Activated CCID %d (%s)\n",
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ccid_ops->ccid_id, ccid_ops->ccid_name);
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err = 0;
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out:
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return err;
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out_free_tx_slab:
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ccid_kmem_cache_destroy(ccid_ops->ccid_hc_tx_slab);
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ccid_ops->ccid_hc_tx_slab = NULL;
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goto out;
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out_free_rx_slab:
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ccid_kmem_cache_destroy(ccid_ops->ccid_hc_rx_slab);
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ccid_ops->ccid_hc_rx_slab = NULL;
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goto out;
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}
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EXPORT_SYMBOL_GPL(ccid_register);
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int ccid_unregister(struct ccid_operations *ccid_ops)
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static void ccid_deactivate(struct ccid_operations *ccid_ops)
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{
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ccids_write_lock();
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ccids[ccid_ops->ccid_id] = NULL;
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ccids_write_unlock();
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ccid_kmem_cache_destroy(ccid_ops->ccid_hc_tx_slab);
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ccid_ops->ccid_hc_tx_slab = NULL;
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ccid_kmem_cache_destroy(ccid_ops->ccid_hc_rx_slab);
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ccid_ops->ccid_hc_rx_slab = NULL;
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pr_info("CCID: Unregistered CCID %d (%s)\n",
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pr_info("CCID: Deactivated CCID %d (%s)\n",
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ccid_ops->ccid_id, ccid_ops->ccid_name);
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return 0;
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}
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EXPORT_SYMBOL_GPL(ccid_unregister);
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struct ccid *ccid_new(unsigned char id, struct sock *sk, int rx, gfp_t gfp)
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{
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struct ccid_operations *ccid_ops;
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struct ccid_operations *ccid_ops = ccid_by_number(id);
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struct ccid *ccid = NULL;
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ccids_read_lock();
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#ifdef CONFIG_MODULES
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if (ccids[id] == NULL) {
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/* We only try to load if in process context */
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ccids_read_unlock();
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if (gfp & GFP_ATOMIC)
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goto out;
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request_module("net-dccp-ccid-%d", id);
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ccids_read_lock();
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}
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#endif
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ccid_ops = ccids[id];
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if (ccid_ops == NULL)
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goto out_unlock;
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if (!try_module_get(ccid_ops->ccid_owner))
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goto out_unlock;
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ccids_read_unlock();
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goto out;
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ccid = kmem_cache_alloc(rx ? ccid_ops->ccid_hc_rx_slab :
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ccid_ops->ccid_hc_tx_slab, gfp);
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if (ccid == NULL)
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goto out_module_put;
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goto out;
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ccid->ccid_ops = ccid_ops;
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if (rx) {
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memset(ccid + 1, 0, ccid_ops->ccid_hc_rx_obj_size);
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@ -239,15 +267,10 @@ struct ccid *ccid_new(unsigned char id, struct sock *sk, int rx, gfp_t gfp)
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}
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out:
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return ccid;
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out_unlock:
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ccids_read_unlock();
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goto out;
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out_free_ccid:
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kmem_cache_free(rx ? ccid_ops->ccid_hc_rx_slab :
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ccid_ops->ccid_hc_tx_slab, ccid);
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ccid = NULL;
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out_module_put:
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module_put(ccid_ops->ccid_owner);
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goto out;
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}
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@ -270,10 +293,6 @@ static void ccid_delete(struct ccid *ccid, struct sock *sk, int rx)
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ccid_ops->ccid_hc_tx_exit(sk);
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kmem_cache_free(ccid_ops->ccid_hc_tx_slab, ccid);
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}
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ccids_read_lock();
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if (ccids[ccid_ops->ccid_id] != NULL)
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module_put(ccid_ops->ccid_owner);
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ccids_read_unlock();
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}
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void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk)
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@ -289,3 +308,28 @@ void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk)
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}
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EXPORT_SYMBOL_GPL(ccid_hc_tx_delete);
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int __init ccid_initialize_builtins(void)
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{
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int i, err;
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for (i = 0; i < ARRAY_SIZE(ccids); i++) {
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err = ccid_activate(ccids[i]);
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if (err)
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goto unwind_registrations;
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}
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return 0;
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unwind_registrations:
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while(--i >= 0)
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ccid_deactivate(ccids[i]);
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return err;
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}
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void ccid_cleanup_builtins(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(ccids); i++)
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ccid_deactivate(ccids[i]);
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}
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@ -29,7 +29,6 @@ struct tcp_info;
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* @ccid_id: numerical CCID ID (up to %CCID_MAX, cf. table 5 in RFC 4340, 10.)
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* @ccid_ccmps: the CCMPS including network/transport headers (0 when disabled)
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* @ccid_name: alphabetical identifier string for @ccid_id
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* @ccid_owner: module which implements/owns this CCID
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* @ccid_hc_{r,t}x_slab: memory pool for the receiver/sender half-connection
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* @ccid_hc_{r,t}x_obj_size: size of the receiver/sender half-connection socket
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*
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@ -48,7 +47,6 @@ struct ccid_operations {
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unsigned char ccid_id;
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__u32 ccid_ccmps;
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const char *ccid_name;
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struct module *ccid_owner;
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struct kmem_cache *ccid_hc_rx_slab,
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*ccid_hc_tx_slab;
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__u32 ccid_hc_rx_obj_size,
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@ -90,8 +88,13 @@ struct ccid_operations {
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int __user *optlen);
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};
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extern int ccid_register(struct ccid_operations *ccid_ops);
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extern int ccid_unregister(struct ccid_operations *ccid_ops);
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extern struct ccid_operations ccid2_ops;
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#ifdef CONFIG_IP_DCCP_CCID3
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extern struct ccid_operations ccid3_ops;
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#endif
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extern int ccid_initialize_builtins(void);
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extern void ccid_cleanup_builtins(void);
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struct ccid {
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struct ccid_operations *ccid_ops;
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@ -1,80 +1,52 @@
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menu "DCCP CCIDs Configuration (EXPERIMENTAL)"
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depends on EXPERIMENTAL
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config IP_DCCP_CCID2
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tristate "CCID2 (TCP-Like) (EXPERIMENTAL)"
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def_tristate IP_DCCP
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select IP_DCCP_ACKVEC
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---help---
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CCID 2, TCP-like Congestion Control, denotes Additive Increase,
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Multiplicative Decrease (AIMD) congestion control with behavior
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modelled directly on TCP, including congestion window, slow start,
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timeouts, and so forth [RFC 2581]. CCID 2 achieves maximum
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bandwidth over the long term, consistent with the use of end-to-end
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congestion control, but halves its congestion window in response to
|
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each congestion event. This leads to the abrupt rate changes
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typical of TCP. Applications should use CCID 2 if they prefer
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maximum bandwidth utilization to steadiness of rate. This is often
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the case for applications that are not playing their data directly
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to the user. For example, a hypothetical application that
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transferred files over DCCP, using application-level retransmissions
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for lost packets, would prefer CCID 2 to CCID 3. On-line games may
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also prefer CCID 2. See RFC 4341 for further details.
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CCID2 is the default CCID used by DCCP.
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config IP_DCCP_CCID2_DEBUG
|
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bool "CCID2 debugging messages"
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depends on IP_DCCP_CCID2
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---help---
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Enable CCID2-specific debugging messages.
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bool "CCID-2 debugging messages"
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---help---
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Enable CCID-2 specific debugging messages.
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When compiling CCID2 as a module, this debugging output can
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additionally be toggled by setting the ccid2_debug module
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parameter to 0 or 1.
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The debugging output can additionally be toggled by setting the
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ccid2_debug parameter to 0 or 1.
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|
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If in doubt, say N.
|
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If in doubt, say N.
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config IP_DCCP_CCID3
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tristate "CCID3 (TCP-Friendly) (EXPERIMENTAL)"
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def_tristate IP_DCCP
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bool "CCID-3 (TCP-Friendly) (EXPERIMENTAL)"
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def_bool y if (IP_DCCP = y || IP_DCCP = m)
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select IP_DCCP_TFRC_LIB
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---help---
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CCID 3 denotes TCP-Friendly Rate Control (TFRC), an equation-based
|
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CCID-3 denotes TCP-Friendly Rate Control (TFRC), an equation-based
|
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rate-controlled congestion control mechanism. TFRC is designed to
|
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be reasonably fair when competing for bandwidth with TCP-like flows,
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where a flow is "reasonably fair" if its sending rate is generally
|
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within a factor of two of the sending rate of a TCP flow under the
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same conditions. However, TFRC has a much lower variation of
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throughput over time compared with TCP, which makes CCID 3 more
|
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suitable than CCID 2 for applications such streaming media where a
|
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throughput over time compared with TCP, which makes CCID-3 more
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suitable than CCID-2 for applications such streaming media where a
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relatively smooth sending rate is of importance.
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|
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CCID 3 is further described in RFC 4342,
|
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CCID-3 is further described in RFC 4342,
|
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http://www.ietf.org/rfc/rfc4342.txt
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|
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The TFRC congestion control algorithms were initially described in
|
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RFC 3448.
|
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RFC 5448.
|
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|
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This text was extracted from RFC 4340 (sec. 10.2),
|
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http://www.ietf.org/rfc/rfc4340.txt
|
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|
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To compile this CCID as a module, choose M here: the module will be
|
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called dccp_ccid3.
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|
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If in doubt, say M.
|
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If in doubt, say N.
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|
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config IP_DCCP_CCID3_DEBUG
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bool "CCID3 debugging messages"
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||||
depends on IP_DCCP_CCID3
|
||||
---help---
|
||||
Enable CCID3-specific debugging messages.
|
||||
bool "CCID-3 debugging messages"
|
||||
depends on IP_DCCP_CCID3
|
||||
---help---
|
||||
Enable CCID-3 specific debugging messages.
|
||||
|
||||
When compiling CCID3 as a module, this debugging output can
|
||||
additionally be toggled by setting the ccid3_debug module
|
||||
parameter to 0 or 1.
|
||||
The debugging output can additionally be toggled by setting the
|
||||
ccid3_debug parameter to 0 or 1.
|
||||
|
||||
If in doubt, say N.
|
||||
If in doubt, say N.
|
||||
|
||||
config IP_DCCP_CCID3_RTO
|
||||
int "Use higher bound for nofeedback timer"
|
||||
|
|
|
|||
|
|
@ -1,9 +1 @@
|
|||
obj-$(CONFIG_IP_DCCP_CCID3) += dccp_ccid3.o
|
||||
|
||||
dccp_ccid3-y := ccid3.o
|
||||
|
||||
obj-$(CONFIG_IP_DCCP_CCID2) += dccp_ccid2.o
|
||||
|
||||
dccp_ccid2-y := ccid2.o
|
||||
|
||||
obj-y += lib/
|
||||
|
|
|
|||
|
|
@ -768,10 +768,9 @@ static void ccid2_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
|
|||
}
|
||||
}
|
||||
|
||||
static struct ccid_operations ccid2 = {
|
||||
struct ccid_operations ccid2_ops = {
|
||||
.ccid_id = DCCPC_CCID2,
|
||||
.ccid_name = "TCP-like",
|
||||
.ccid_owner = THIS_MODULE,
|
||||
.ccid_hc_tx_obj_size = sizeof(struct ccid2_hc_tx_sock),
|
||||
.ccid_hc_tx_init = ccid2_hc_tx_init,
|
||||
.ccid_hc_tx_exit = ccid2_hc_tx_exit,
|
||||
|
|
@ -784,22 +783,5 @@ static struct ccid_operations ccid2 = {
|
|||
|
||||
#ifdef CONFIG_IP_DCCP_CCID2_DEBUG
|
||||
module_param(ccid2_debug, bool, 0644);
|
||||
MODULE_PARM_DESC(ccid2_debug, "Enable debug messages");
|
||||
MODULE_PARM_DESC(ccid2_debug, "Enable CCID-2 debug messages");
|
||||
#endif
|
||||
|
||||
static __init int ccid2_module_init(void)
|
||||
{
|
||||
return ccid_register(&ccid2);
|
||||
}
|
||||
module_init(ccid2_module_init);
|
||||
|
||||
static __exit void ccid2_module_exit(void)
|
||||
{
|
||||
ccid_unregister(&ccid2);
|
||||
}
|
||||
module_exit(ccid2_module_exit);
|
||||
|
||||
MODULE_AUTHOR("Andrea Bittau <a.bittau@cs.ucl.ac.uk>");
|
||||
MODULE_DESCRIPTION("DCCP TCP-Like (CCID2) CCID");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS("net-dccp-ccid-2");
|
||||
|
|
|
|||
|
|
@ -940,10 +940,9 @@ static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len,
|
|||
return 0;
|
||||
}
|
||||
|
||||
static struct ccid_operations ccid3 = {
|
||||
struct ccid_operations ccid3_ops = {
|
||||
.ccid_id = DCCPC_CCID3,
|
||||
.ccid_name = "TCP-Friendly Rate Control",
|
||||
.ccid_owner = THIS_MODULE,
|
||||
.ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock),
|
||||
.ccid_hc_tx_init = ccid3_hc_tx_init,
|
||||
.ccid_hc_tx_exit = ccid3_hc_tx_exit,
|
||||
|
|
@ -964,23 +963,5 @@ static struct ccid_operations ccid3 = {
|
|||
|
||||
#ifdef CONFIG_IP_DCCP_CCID3_DEBUG
|
||||
module_param(ccid3_debug, bool, 0644);
|
||||
MODULE_PARM_DESC(ccid3_debug, "Enable debug messages");
|
||||
MODULE_PARM_DESC(ccid3_debug, "Enable CCID-3 debug messages");
|
||||
#endif
|
||||
|
||||
static __init int ccid3_module_init(void)
|
||||
{
|
||||
return ccid_register(&ccid3);
|
||||
}
|
||||
module_init(ccid3_module_init);
|
||||
|
||||
static __exit void ccid3_module_exit(void)
|
||||
{
|
||||
ccid_unregister(&ccid3);
|
||||
}
|
||||
module_exit(ccid3_module_exit);
|
||||
|
||||
MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, "
|
||||
"Arnaldo Carvalho de Melo <acme@ghostprotocols.net>");
|
||||
MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS("net-dccp-ccid-3");
|
||||
|
|
|
|||
|
|
@ -432,10 +432,8 @@ static inline int dccp_ack_pending(const struct sock *sk)
|
|||
{
|
||||
const struct dccp_sock *dp = dccp_sk(sk);
|
||||
return dp->dccps_timestamp_echo != 0 ||
|
||||
#ifdef CONFIG_IP_DCCP_ACKVEC
|
||||
(dp->dccps_hc_rx_ackvec != NULL &&
|
||||
dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
|
||||
#endif
|
||||
inet_csk_ack_scheduled(sk);
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -1118,9 +1118,15 @@ static int __init dccp_init(void)
|
|||
if (rc)
|
||||
goto out_ackvec_exit;
|
||||
|
||||
rc = ccid_initialize_builtins();
|
||||
if (rc)
|
||||
goto out_sysctl_exit;
|
||||
|
||||
dccp_timestamping_init();
|
||||
out:
|
||||
return rc;
|
||||
out_sysctl_exit:
|
||||
dccp_sysctl_exit();
|
||||
out_ackvec_exit:
|
||||
dccp_ackvec_exit();
|
||||
out_free_dccp_mib:
|
||||
|
|
@ -1143,6 +1149,7 @@ out_free_percpu:
|
|||
|
||||
static void __exit dccp_fini(void)
|
||||
{
|
||||
ccid_cleanup_builtins();
|
||||
dccp_mib_exit();
|
||||
free_pages((unsigned long)dccp_hashinfo.bhash,
|
||||
get_order(dccp_hashinfo.bhash_size *
|
||||
|
|
|
|||
Reference in New Issue