| Message ID | 1623315118-57936-2-git-send-email-liyonglong@chinatelecom.cn (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Delegated to: | Paolo Abeni |
| Headers | show |
| Series | mptcp: fix conflicts when using pm.add_signal in ADD_ADDR/echo and RM_ADDR process | expand |
On Thu, 2021-06-10 at 16:51 +0800, Yonglong Li wrote: > ADD_ADDR share pm.addr_signal with RM_ADDR, so after RM_ADDR/ADD_ADDR > done we should not clean ADD_ADDR/RM_ADDR's addr_signal. > > Signed-off-by: Yonglong Li <liyonglong@chinatelecom.cn> > --- > net/mptcp/pm.c | 10 +++++++--- > 1 file changed, 7 insertions(+), 3 deletions(-) > > diff --git a/net/mptcp/pm.c b/net/mptcp/pm.c > index 9d00fa6..74886a3 100644 > --- a/net/mptcp/pm.c > +++ b/net/mptcp/pm.c > @@ -252,6 +252,7 @@ void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup) > bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining, > struct mptcp_addr_info *saddr, bool *echo, bool *port) > { > + u8 add_addr; > int ret = false; > > spin_lock_bh(&msk->pm.lock); > @@ -267,7 +268,8 @@ bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining, > goto out_unlock; > > *saddr = msk->pm.local; > - WRITE_ONCE(msk->pm.addr_signal, 0); > + add_addr = READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); This chunk of code is under the pm spin lock and pm.addr_signal is modified only under such lock, so no need to READ_ONCE() msk- >pm.addr_signal. > + WRITE_ONCE(msk->pm.addr_signal, add_addr); > ret = true; > > out_unlock: > @@ -278,6 +280,7 @@ bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining, > bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, > struct mptcp_rm_list *rm_list) > { > + u8 rm_addr; > int ret = false, len; > > spin_lock_bh(&msk->pm.lock); > @@ -286,16 +289,17 @@ bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, > if (!mptcp_pm_should_rm_signal(msk)) > goto out_unlock; > > + rm_addr = READ_ONCE(msk->pm.addr_signal) & ~BIT(MPTCP_RM_ADDR_SIGNAL); Same here. > len = mptcp_rm_addr_len(&msk->pm.rm_list_tx); > if (len < 0) { > - WRITE_ONCE(msk->pm.addr_signal, 0); > + WRITE_ONCE(msk->pm.addr_signal, rm_addr); > goto out_unlock; > } > if (remaining < len) > goto out_unlock; > > *rm_list = msk->pm.rm_list_tx; > - WRITE_ONCE(msk->pm.addr_signal, 0); > + WRITE_ONCE(msk->pm.addr_signal, rm_addr); > ret = true; > > out_unlock:
diff --git a/net/mptcp/pm.c b/net/mptcp/pm.c index 9d00fa6..74886a3 100644 --- a/net/mptcp/pm.c +++ b/net/mptcp/pm.c @@ -252,6 +252,7 @@ void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup) bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining, struct mptcp_addr_info *saddr, bool *echo, bool *port) { + u8 add_addr; int ret = false; spin_lock_bh(&msk->pm.lock); @@ -267,7 +268,8 @@ bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining, goto out_unlock; *saddr = msk->pm.local; - WRITE_ONCE(msk->pm.addr_signal, 0); + add_addr = READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); + WRITE_ONCE(msk->pm.addr_signal, add_addr); ret = true; out_unlock: @@ -278,6 +280,7 @@ bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining, bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, struct mptcp_rm_list *rm_list) { + u8 rm_addr; int ret = false, len; spin_lock_bh(&msk->pm.lock); @@ -286,16 +289,17 @@ bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, if (!mptcp_pm_should_rm_signal(msk)) goto out_unlock; + rm_addr = READ_ONCE(msk->pm.addr_signal) & ~BIT(MPTCP_RM_ADDR_SIGNAL); len = mptcp_rm_addr_len(&msk->pm.rm_list_tx); if (len < 0) { - WRITE_ONCE(msk->pm.addr_signal, 0); + WRITE_ONCE(msk->pm.addr_signal, rm_addr); goto out_unlock; } if (remaining < len) goto out_unlock; *rm_list = msk->pm.rm_list_tx; - WRITE_ONCE(msk->pm.addr_signal, 0); + WRITE_ONCE(msk->pm.addr_signal, rm_addr); ret = true; out_unlock:
ADD_ADDR share pm.addr_signal with RM_ADDR, so after RM_ADDR/ADD_ADDR done we should not clean ADD_ADDR/RM_ADDR's addr_signal. Signed-off-by: Yonglong Li <liyonglong@chinatelecom.cn> --- net/mptcp/pm.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)