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Date: Wed, 21 Dec 2016 09:11:08 -0500
From: Neil Horman <nhorman@...driver.com>
To: Julian Anastasov <ja@....bg>
Cc: netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
YueHaibing <yuehaibing@...wei.com>
Subject: Re: [PATCH RFC net-next 3/7] sctp: add dst_pending_confirm flag
On Sun, Dec 18, 2016 at 10:56:32PM +0200, Julian Anastasov wrote:
> Add new transport flag to allow sockets to confirm neighbour.
> When same struct dst_entry can be used for many different
> neighbours we can not use it for pending confirmations.
> The flag is propagated from transport to every packet.
> It is reset when cached dst is reset.
>
> Reported-by: YueHaibing <yuehaibing@...wei.com>
> Fixes: 5110effee8fd ("net: Do delayed neigh confirmation.")
> Fixes: f2bb4bedf35d ("ipv4: Cache output routes in fib_info nexthops.")
> Signed-off-by: Julian Anastasov <ja@....bg>
> ---
> include/net/sctp/sctp.h | 6 ++----
> include/net/sctp/structs.h | 4 ++++
> net/sctp/associola.c | 3 +--
> net/sctp/output.c | 10 +++++++++-
> net/sctp/outqueue.c | 2 +-
> net/sctp/sm_make_chunk.c | 6 ++----
> net/sctp/sm_sideeffect.c | 2 +-
> net/sctp/socket.c | 4 ++--
> net/sctp/transport.c | 18 +++++++++++++++++-
> 9 files changed, 39 insertions(+), 16 deletions(-)
>
> diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
> index f0dcaeb..85d9083 100644
> --- a/include/net/sctp/sctp.h
> +++ b/include/net/sctp/sctp.h
> @@ -586,10 +586,8 @@ static inline void sctp_v4_map_v6(union sctp_addr *addr)
> */
> static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t)
> {
> - if (t->dst && !dst_check(t->dst, t->dst_cookie)) {
> - dst_release(t->dst);
> - t->dst = NULL;
> - }
> + if (t->dst && !dst_check(t->dst, t->dst_cookie))
> + sctp_transport_dst_release(t);
>
> return t->dst;
> }
> diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
> index 92daabd..e842e84 100644
> --- a/include/net/sctp/structs.h
> +++ b/include/net/sctp/structs.h
> @@ -838,6 +838,8 @@ struct sctp_transport {
>
> __u32 burst_limited; /* Holds old cwnd when max.burst is applied */
>
> + __u32 dst_pending_confirm; /* need to confirm neighbour */
> +
> /* Destination */
> struct dst_entry *dst;
> /* Source address. */
> @@ -980,6 +982,8 @@ void sctp_transport_route(struct sctp_transport *, union sctp_addr *,
> void sctp_transport_reset(struct sctp_transport *);
> void sctp_transport_update_pmtu(struct sock *, struct sctp_transport *, u32);
> void sctp_transport_immediate_rtx(struct sctp_transport *);
> +void sctp_transport_dst_release(struct sctp_transport *t);
> +void sctp_transport_dst_confirm(struct sctp_transport *t);
>
>
> /* This is the structure we use to queue packets as they come into
> diff --git a/net/sctp/associola.c b/net/sctp/associola.c
> index 68428e1..7bd26e0 100644
> --- a/net/sctp/associola.c
> +++ b/net/sctp/associola.c
> @@ -820,8 +820,7 @@ void sctp_assoc_control_transport(struct sctp_association *asoc,
> if (transport->state != SCTP_UNCONFIRMED)
> transport->state = SCTP_INACTIVE;
> else {
> - dst_release(transport->dst);
> - transport->dst = NULL;
> + sctp_transport_dst_release(transport);
> ulp_notify = false;
> }
>
> diff --git a/net/sctp/output.c b/net/sctp/output.c
> index f5320a8..4684a00 100644
> --- a/net/sctp/output.c
> +++ b/net/sctp/output.c
> @@ -550,6 +550,7 @@ int sctp_packet_transmit(struct sctp_packet *packet, gfp_t gfp)
> struct sctp_association *asoc = tp->asoc;
> struct sctp_chunk *chunk, *tmp;
> int pkt_count, gso = 0;
> + int confirm;
> struct dst_entry *dst;
> struct sk_buff *head;
> struct sctphdr *sh;
> @@ -628,7 +629,14 @@ int sctp_packet_transmit(struct sctp_packet *packet, gfp_t gfp)
> asoc->peer.last_sent_to = tp;
> }
> head->ignore_df = packet->ipfragok;
> - tp->af_specific->sctp_xmit(head, tp);
> + confirm = tp->dst_pending_confirm;
> + if (confirm)
> + head->dst_pending_confirm = 1;
Why not use your confirm helper function here?
> + /* neighbour should be confirmed on successful transmission or
> + * positive error
> + */
> + if (tp->af_specific->sctp_xmit(head, tp) >= 0 && confirm)
> + tp->dst_pending_confirm = 0;
>
> out:
> list_for_each_entry_safe(chunk, tmp, &packet->chunk_list, list) {
> diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
> index e540826..8234799 100644
> --- a/net/sctp/outqueue.c
> +++ b/net/sctp/outqueue.c
> @@ -1641,7 +1641,7 @@ static void sctp_check_transmitted(struct sctp_outq *q,
>
> if (forward_progress) {
> if (transport->dst)
> - dst_confirm(transport->dst);
> + sctp_transport_dst_confirm(transport);
> }
> }
>
> diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
> index 9e9690b..6fb15bf 100644
> --- a/net/sctp/sm_make_chunk.c
> +++ b/net/sctp/sm_make_chunk.c
> @@ -3317,8 +3317,7 @@ static void sctp_asconf_param_success(struct sctp_association *asoc,
> local_bh_enable();
> list_for_each_entry(transport, &asoc->peer.transport_addr_list,
> transports) {
> - dst_release(transport->dst);
> - transport->dst = NULL;
> + sctp_transport_dst_release(transport);
> }
> break;
> case SCTP_PARAM_DEL_IP:
> @@ -3332,8 +3331,7 @@ static void sctp_asconf_param_success(struct sctp_association *asoc,
> local_bh_enable();
> list_for_each_entry(transport, &asoc->peer.transport_addr_list,
> transports) {
> - dst_release(transport->dst);
> - transport->dst = NULL;
> + sctp_transport_dst_release(transport);
> }
> break;
> default:
> diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
> index c345bf1..9255b29 100644
> --- a/net/sctp/sm_sideeffect.c
> +++ b/net/sctp/sm_sideeffect.c
> @@ -723,7 +723,7 @@ static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds,
> * forward progress.
> */
> if (t->dst)
> - dst_confirm(t->dst);
> + sctp_transport_dst_confirm(t);
>
> /* The receiver of the HEARTBEAT ACK should also perform an
> * RTT measurement for that destination transport address
> diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> index 318c678..9ee676a 100644
> --- a/net/sctp/socket.c
> +++ b/net/sctp/socket.c
> @@ -588,7 +588,7 @@ static int sctp_send_asconf_add_ip(struct sock *sk,
> list_for_each_entry(trans,
> &asoc->peer.transport_addr_list, transports) {
> /* Clear the source and route cache */
> - dst_release(trans->dst);
> + sctp_transport_dst_release(trans);
> trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
> 2*asoc->pathmtu, 4380));
> trans->ssthresh = asoc->peer.i.a_rwnd;
> @@ -839,7 +839,7 @@ static int sctp_send_asconf_del_ip(struct sock *sk,
> */
> list_for_each_entry(transport, &asoc->peer.transport_addr_list,
> transports) {
> - dst_release(transport->dst);
> + sctp_transport_dst_release(transport);
> sctp_transport_route(transport, NULL,
> sctp_sk(asoc->base.sk));
> }
> diff --git a/net/sctp/transport.c b/net/sctp/transport.c
> index ce54dce..db66514 100644
> --- a/net/sctp/transport.c
> +++ b/net/sctp/transport.c
> @@ -227,7 +227,7 @@ void sctp_transport_pmtu(struct sctp_transport *transport, struct sock *sk)
> {
> /* If we don't have a fresh route, look one up */
> if (!transport->dst || transport->dst->obsolete) {
> - dst_release(transport->dst);
> + sctp_transport_dst_release(transport);
> transport->af_specific->get_dst(transport, &transport->saddr,
> &transport->fl, sk);
> }
> @@ -659,3 +659,19 @@ void sctp_transport_immediate_rtx(struct sctp_transport *t)
> sctp_transport_hold(t);
> }
> }
> +
> +/* Drop dst */
> +void sctp_transport_dst_release(struct sctp_transport *t)
> +{
> + dst_release(t->dst);
> + t->dst = NULL;
> + t->dst_pending_confirm = 0;
> +}
> +
> +/* Schedule neighbour confirm */
> +void sctp_transport_dst_confirm(struct sctp_transport *t)
> +{
> + if (!t->dst_pending_confirm)
> + t->dst_pending_confirm = 1;
I'm not sure why you check it for being zero before setting it here, just set it
unilaterally instead, or are you trying to avoid dirtying a cacheline?
Neil
> +}
> +
> --
> 1.9.3
>
> --
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