On Sun, Mar 31, 2019 at 04:53:47PM +0800, Xin Long wrote:
> sk_forward_alloc's updating is also done on rx path, but to be consistent
> we change to use sk_mem_charge() in sctp_skb_set_owner_r().
>
> In sctp_eat_data(), it's not enough to check sctp_memory_pressure only,
> which doesn't work for mem_cgroup_sockets_enabled, so we change to use
> sk_under_memory_pressure().
>
> When it's under memory pressure, sk_mem_reclaim() and sk_rmem_schedule()
> should be called on both RENEGE or CHUNK DELIVERY path exit the memory
> pressure status as soon as possible.
>
> Note that sk_rmem_schedule() is using datalen to make things easy there.
>
> Signed-off-by: Xin Long <lucien....@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leit...@gmail.com>
> ---
> include/net/sctp/sctp.h | 2 +-
> net/sctp/sm_statefuns.c | 6 ++++--
> net/sctp/ulpevent.c | 19 ++++++++-----------
> net/sctp/ulpqueue.c | 3 ++-
> 4 files changed, 15 insertions(+), 15 deletions(-)
>
> diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
> index 1d13ec3..eefdfa5 100644
> --- a/include/net/sctp/sctp.h
> +++ b/include/net/sctp/sctp.h
> @@ -421,7 +421,7 @@ static inline void sctp_skb_set_owner_r(struct sk_buff
> *skb, struct sock *sk)
> /*
> * This mimics the behavior of skb_set_owner_r
> */
> - sk->sk_forward_alloc -= event->rmem_len;
> + sk_mem_charge(sk, event->rmem_len);
> }
>
> /* Tests if the list has one and only one entry. */
> diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
> index c9ae340..7dfc34b 100644
> --- a/net/sctp/sm_statefuns.c
> +++ b/net/sctp/sm_statefuns.c
> @@ -6412,13 +6412,15 @@ static int sctp_eat_data(const struct
> sctp_association *asoc,
> * in sctp_ulpevent_make_rcvmsg will drop the frame if we grow our
> * memory usage too much
> */
> - if (*sk->sk_prot_creator->memory_pressure) {
> + if (sk_under_memory_pressure(sk)) {
> if (sctp_tsnmap_has_gap(map) &&
> (sctp_tsnmap_get_ctsn(map) + 1) == tsn) {
> pr_debug("%s: under pressure, reneging for tsn:%u\n",
> __func__, tsn);
> deliver = SCTP_CMD_RENEGE;
> - }
> + } else {
> + sk_mem_reclaim(sk);
> + }
> }
>
> /*
> diff --git a/net/sctp/ulpevent.c b/net/sctp/ulpevent.c
> index 8cb7d98..c2a7478 100644
> --- a/net/sctp/ulpevent.c
> +++ b/net/sctp/ulpevent.c
> @@ -634,8 +634,9 @@ struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct
> sctp_association *asoc,
> gfp_t gfp)
> {
> struct sctp_ulpevent *event = NULL;
> - struct sk_buff *skb;
> - size_t padding, len;
> + struct sk_buff *skb = chunk->skb;
> + struct sock *sk = asoc->base.sk;
> + size_t padding, datalen;
> int rx_count;
>
> /*
> @@ -646,15 +647,12 @@ struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct
> sctp_association *asoc,
> if (asoc->ep->rcvbuf_policy)
> rx_count = atomic_read(&asoc->rmem_alloc);
> else
> - rx_count = atomic_read(&asoc->base.sk->sk_rmem_alloc);
> + rx_count = atomic_read(&sk->sk_rmem_alloc);
>
> - if (rx_count >= asoc->base.sk->sk_rcvbuf) {
> + datalen = ntohs(chunk->chunk_hdr->length);
>
> - if ((asoc->base.sk->sk_userlocks & SOCK_RCVBUF_LOCK) ||
> - (!sk_rmem_schedule(asoc->base.sk, chunk->skb,
> - chunk->skb->truesize)))
> - goto fail;
> - }
> + if (rx_count >= sk->sk_rcvbuf || !sk_rmem_schedule(sk, skb, datalen))
> + goto fail;
>
> /* Clone the original skb, sharing the data. */
> skb = skb_clone(chunk->skb, gfp);
> @@ -681,8 +679,7 @@ struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct
> sctp_association *asoc,
> * The sender should never pad with more than 3 bytes. The receiver
> * MUST ignore the padding bytes.
> */
> - len = ntohs(chunk->chunk_hdr->length);
> - padding = SCTP_PAD4(len) - len;
> + padding = SCTP_PAD4(datalen) - datalen;
>
> /* Fixup cloned skb with just this chunks data. */
> skb_trim(skb, chunk->chunk_end - padding - skb->data);
> diff --git a/net/sctp/ulpqueue.c b/net/sctp/ulpqueue.c
> index 5dde921..770ff1f 100644
> --- a/net/sctp/ulpqueue.c
> +++ b/net/sctp/ulpqueue.c
> @@ -1106,7 +1106,8 @@ void sctp_ulpq_renege(struct sctp_ulpq *ulpq, struct
> sctp_chunk *chunk,
> freed += sctp_ulpq_renege_frags(ulpq, needed - freed);
> }
> /* If able to free enough room, accept this chunk. */
> - if (freed >= needed) {
> + if (sk_rmem_schedule(asoc->base.sk, chunk->skb, needed) &&
> + freed >= needed) {
> int retval = sctp_ulpq_tail_data(ulpq, chunk, gfp);
> /*
> * Enter partial delivery if chunk has not been
> --
> 2.1.0
>
