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mptcp: pm: reduce entries iterations on connect

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__mptcp_subflow_connect() is currently called from the path-managers,
which have all the required information to create subflows. No need to
call the PM again to re-iterate over the list of entries with RCU lock
to get more info.

Instead, it is possible to pass a mptcp_pm_addr_entry structure, instead
of a mptcp_addr_info one. The former contains the ifindex and the flags
that are required when creating the new subflow.

This is a partial revert of commit ee285257a9 ("mptcp: drop flags and
ifindex arguments").

While at it, the local ID can also be set if it is known and 0, to avoid
having to set it in the 'rebuild_header' hook, which will cause a new
iteration of the endpoint entries.

Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20240902-net-next-mptcp-mib-mpjtx-misc-v1-2-d3e0f3773b90@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Matthieu Baerts (NGI0)
2024-09-02 12:45:53 +02:00
committed by Jakub Kicinski
parent 7bcf4d8022
commit b83fbca1b4
5 changed files with 62 additions and 100 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
net/mptcp/pm_userspace.c
View File

@@ -119,23 +119,6 @@ mptcp_userspace_pm_lookup_addr_by_id(struct mptcp_sock *msk, unsigned int id)
return NULL;
}
int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
unsigned int id,
u8 *flags, int *ifindex)
{
struct mptcp_pm_addr_entry *match;
spin_lock_bh(&msk->pm.lock);
match = mptcp_userspace_pm_lookup_addr_by_id(msk, id);
spin_unlock_bh(&msk->pm.lock);
if (match) {
*flags = match->flags;
*ifindex = match->ifindex;
}
return 0;
}
int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk,
struct mptcp_addr_info *skc)
{
@@ -352,8 +335,9 @@ int mptcp_pm_nl_subflow_create_doit(struct sk_buff *skb, struct genl_info *info)
struct nlattr *raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE];
struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
struct nlattr *laddr = info->attrs[MPTCP_PM_ATTR_ADDR];
struct mptcp_pm_addr_entry local = { 0 };
struct mptcp_pm_addr_entry entry = { 0 };
struct mptcp_addr_info addr_r;
struct mptcp_pm_local local;
struct mptcp_sock *msk;
int err = -EINVAL;
struct sock *sk;
@@ -379,18 +363,18 @@ int mptcp_pm_nl_subflow_create_doit(struct sk_buff *skb, struct genl_info *info)
goto create_err;
}
err = mptcp_pm_parse_entry(laddr, info, true, &local);
err = mptcp_pm_parse_entry(laddr, info, true, &entry);
if (err < 0) {
NL_SET_ERR_MSG_ATTR(info->extack, laddr, "error parsing local addr");
goto create_err;
}
if (local.flags & MPTCP_PM_ADDR_FLAG_SIGNAL) {
if (entry.flags & MPTCP_PM_ADDR_FLAG_SIGNAL) {
GENL_SET_ERR_MSG(info, "invalid addr flags");
err = -EINVAL;
goto create_err;
}
local.flags |= MPTCP_PM_ADDR_FLAG_SUBFLOW;
entry.flags |= MPTCP_PM_ADDR_FLAG_SUBFLOW;
err = mptcp_pm_parse_addr(raddr, info, &addr_r);
if (err < 0) {
@@ -398,27 +382,29 @@ int mptcp_pm_nl_subflow_create_doit(struct sk_buff *skb, struct genl_info *info)
goto create_err;
}
if (!mptcp_pm_addr_families_match(sk, &local.addr, &addr_r)) {
if (!mptcp_pm_addr_families_match(sk, &entry.addr, &addr_r)) {
GENL_SET_ERR_MSG(info, "families mismatch");
err = -EINVAL;
goto create_err;
}
err = mptcp_userspace_pm_append_new_local_addr(msk, &local, false);
err = mptcp_userspace_pm_append_new_local_addr(msk, &entry, false);
if (err < 0) {
GENL_SET_ERR_MSG(info, "did not match address and id");
goto create_err;
}
local.addr = entry.addr;
local.flags = entry.flags;
local.ifindex = entry.ifindex;
lock_sock(sk);
err = __mptcp_subflow_connect(sk, &local.addr, &addr_r);
err = __mptcp_subflow_connect(sk, &local, &addr_r);
release_sock(sk);
spin_lock_bh(&msk->pm.lock);
if (err)
mptcp_userspace_pm_delete_local_addr(msk, &local);
mptcp_userspace_pm_delete_local_addr(msk, &entry);
else
msk->pm.subflows++;
spin_unlock_bh(&msk->pm.lock);