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Date: Tue, 27 Nov 2012 23:08:10 +0100
From: Michele Baldessari <michele@...syn.org>
To: Vlad Yasevich <vyasevich@...il.com>
Cc: linux-sctp@...r.kernel.org, Neil Horman <nhorman@...driver.com>,
Thomas Graf <tgraf@...g.ch>, netdev@...r.kernel.org,
"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v2 net-next] sctp: Add support to per-association
statistics via a new SCTP_GET_ASSOC_STATS call
Hi Vlad,
thanks a lot for your review.
On Mon, Nov 19, 2012 at 11:01:46AM -0500, Vlad Yasevich wrote:
<snip>
> >@@ -1152,8 +1156,11 @@ static void sctp_assoc_bh_rcv(struct work_struct *work)
> > */
> > if (sctp_chunk_is_data(chunk))
> > asoc->peer.last_data_from = chunk->transport;
> >- else
> >+ else {
> > SCTP_INC_STATS(net, SCTP_MIB_INCTRLCHUNKS);
> >+ if (chunk->chunk_hdr->type == SCTP_CID_SACK)
> >+ asoc->stats.isacks++;
> >+ }
>
> Should the above include asoc->stats.ictrlchunks++; just like ep_bh_rcv()?
Indeed, I will add that.
> >
> > if (chunk->transport)
> > chunk->transport->last_time_heard = jiffies;
> >diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c
> >index 1859e2b..32ab55b 100644
> >--- a/net/sctp/endpointola.c
> >+++ b/net/sctp/endpointola.c
> >@@ -480,8 +480,11 @@ normal:
> > */
> > if (asoc && sctp_chunk_is_data(chunk))
> > asoc->peer.last_data_from = chunk->transport;
> >- else
> >+ else {
> > SCTP_INC_STATS(sock_net(ep->base.sk), SCTP_MIB_INCTRLCHUNKS);
> >+ if (asoc)
> >+ asoc->stats.ictrlchunks++;
> >+ }
> >
> > if (chunk->transport)
> > chunk->transport->last_time_heard = jiffies;
> >diff --git a/net/sctp/input.c b/net/sctp/input.c
> >index 8bd3c27..54c449b 100644
> >--- a/net/sctp/input.c
> >+++ b/net/sctp/input.c
> >@@ -281,6 +281,8 @@ int sctp_rcv(struct sk_buff *skb)
> > SCTP_INC_STATS_BH(net, SCTP_MIB_IN_PKT_SOFTIRQ);
> > sctp_inq_push(&chunk->rcvr->inqueue, chunk);
> > }
> >+ if (asoc)
> >+ asoc->stats.ipackets++;
> >
> > sctp_bh_unlock_sock(sk);
>
> This needs a bit more thought. Current counting behaves differently
> depending on whether the user holds a socket lock or not.
> If the user holds the lock, we'll end counting the packet before it is
> processed. If the user isn't holding the lock, we'll count the packet after
> it is processed.
I see. What do you prefer: use atomic64 for this specific counter or
since it is a temporary miscount we go ahead and ignore it or do you
have other approaches in mind?
> >
> >diff --git a/net/sctp/output.c b/net/sctp/output.c
> >index 4e90188bf..f5200a2 100644
> >--- a/net/sctp/output.c
> >+++ b/net/sctp/output.c
> >@@ -311,6 +311,8 @@ static sctp_xmit_t __sctp_packet_append_chunk(struct sctp_packet *packet,
> >
> > case SCTP_CID_SACK:
> > packet->has_sack = 1;
> >+ if (chunk->asoc)
> >+ chunk->asoc->stats.osacks++;
> > break;
> >
> > case SCTP_CID_AUTH:
> >@@ -584,11 +586,13 @@ int sctp_packet_transmit(struct sctp_packet *packet)
> > */
> >
> > /* Dump that on IP! */
> >- if (asoc && asoc->peer.last_sent_to != tp) {
> >- /* Considering the multiple CPU scenario, this is a
> >- * "correcter" place for last_sent_to. --xguo
> >- */
> >- asoc->peer.last_sent_to = tp;
> >+ if (asoc) {
> >+ asoc->stats.opackets++;
> >+ if (asoc->peer.last_sent_to != tp)
> >+ /* Considering the multiple CPU scenario, this is a
> >+ * "correcter" place for last_sent_to. --xguo
> >+ */
> >+ asoc->peer.last_sent_to = tp;
> > }
> >
> > if (has_data) {
> >diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
> >index 1b4a7f8..379c81d 100644
> >--- a/net/sctp/outqueue.c
> >+++ b/net/sctp/outqueue.c
> >@@ -667,6 +667,7 @@ redo:
> > chunk->fast_retransmit = SCTP_DONT_FRTX;
> >
> > q->empty = 0;
> >+ q->asoc->stats.rtxchunks++;
> > break;
> > }
> >
> >@@ -876,12 +877,14 @@ static int sctp_outq_flush(struct sctp_outq *q, int rtx_timeout)
> > if (status != SCTP_XMIT_OK) {
> > /* put the chunk back */
> > list_add(&chunk->list, &q->control_chunk_list);
> >- } else if (chunk->chunk_hdr->type == SCTP_CID_FWD_TSN) {
> >+ } else {
> >+ asoc->stats.octrlchunks++;
> > /* PR-SCTP C5) If a FORWARD TSN is sent, the
> > * sender MUST assure that at least one T3-rtx
> > * timer is running.
> > */
> >- sctp_transport_reset_timers(transport);
> >+ if (chunk->chunk_hdr->type == SCTP_CID_FWD_TSN)
> >+ sctp_transport_reset_timers(transport);
> > }
> > break;
> >
> >@@ -1055,6 +1058,10 @@ static int sctp_outq_flush(struct sctp_outq *q, int rtx_timeout)
> > */
> > if (asoc->state == SCTP_STATE_SHUTDOWN_PENDING)
> > chunk->chunk_hdr->flags |= SCTP_DATA_SACK_IMM;
> >+ if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED)
> >+ asoc->stats.ouodchunks++;
> >+ else
> >+ asoc->stats.oodchunks++;
> >
> > break;
> >
> >@@ -1162,6 +1169,7 @@ int sctp_outq_sack(struct sctp_outq *q, struct sctp_chunk *chunk)
> >
> > sack_ctsn = ntohl(sack->cum_tsn_ack);
> > gap_ack_blocks = ntohs(sack->num_gap_ack_blocks);
> >+ asoc->stats.gapcnt += gap_ack_blocks;
> > /*
> > * SFR-CACC algorithm:
> > * On receipt of a SACK the sender SHOULD execute the
> >diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
> >index fbe1636..eb7633f 100644
> >--- a/net/sctp/sm_make_chunk.c
> >+++ b/net/sctp/sm_make_chunk.c
> >@@ -804,10 +804,11 @@ struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
> > gabs);
> >
> > /* Add the duplicate TSN information. */
> >- if (num_dup_tsns)
> >+ if (num_dup_tsns) {
> >+ aptr->stats.idupchunks += num_dup_tsns;
> > sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
> > sctp_tsnmap_get_dups(map));
> >-
> >+ }
> > /* Once we have a sack generated, check to see what our sack
> > * generation is, if its 0, reset the transports to 0, and reset
> > * the association generation to 1
> >diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
> >index 6eecf7e..363727e 100644
> >--- a/net/sctp/sm_sideeffect.c
> >+++ b/net/sctp/sm_sideeffect.c
> >@@ -542,6 +542,7 @@ static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t *commands,
> > */
> > if (!is_hb || transport->hb_sent) {
> > transport->rto = min((transport->rto * 2), transport->asoc->rto_max);
> >+ sctp_max_rto(asoc, transport);
> > }
> > }
> >
> >diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
> >index b6adef8..ecf7a17 100644
> >--- a/net/sctp/sm_statefuns.c
> >+++ b/net/sctp/sm_statefuns.c
> >@@ -6127,6 +6127,8 @@ static int sctp_eat_data(const struct sctp_association *asoc,
> > /* The TSN is too high--silently discard the chunk and
> > * count on it getting retransmitted later.
> > */
> >+ if (chunk->asoc)
> >+ chunk->asoc->stats.outofseqtsns++;
> > return SCTP_IERROR_HIGH_TSN;
> > } else if (tmp > 0) {
> > /* This is a duplicate. Record it. */
> >@@ -6226,10 +6228,14 @@ static int sctp_eat_data(const struct sctp_association *asoc,
> > /* Note: Some chunks may get overcounted (if we drop) or overcounted
> > * if we renege and the chunk arrives again.
> > */
> >- if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED)
> >+ if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
> > SCTP_INC_STATS(net, SCTP_MIB_INUNORDERCHUNKS);
> >- else {
> >+ if (chunk->asoc)
> >+ chunk->asoc->stats.iuodchunks++;
> >+ } else {
> > SCTP_INC_STATS(net, SCTP_MIB_INORDERCHUNKS);
> >+ if (chunk->asoc)
> >+ chunk->asoc->stats.iodchunks++;
> > ordered = 1;
> > }
> >
> >diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> >index 15379ac..8113249 100644
> >--- a/net/sctp/socket.c
> >+++ b/net/sctp/socket.c
> >@@ -609,6 +609,7 @@ static int sctp_send_asconf_add_ip(struct sock *sk,
> > 2*asoc->pathmtu, 4380));
> > trans->ssthresh = asoc->peer.i.a_rwnd;
> > trans->rto = asoc->rto_initial;
> >+ sctp_max_rto(asoc, trans);
> > trans->rtt = trans->srtt = trans->rttvar = 0;
> > sctp_transport_route(trans, NULL,
> > sctp_sk(asoc->base.sk));
> >@@ -5633,6 +5634,74 @@ static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
> > return 0;
> > }
> >
> >+/*
> >+ * SCTP_GET_ASSOC_STATS
> >+ *
> >+ * This option retrieves local per endpoint statistics. It is modeled
> >+ * after OpenSolaris' implementation
> >+ */
> >+static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
> >+ char __user *optval,
> >+ int __user *optlen)
> >+{
> >+ struct sctp_assoc_stats sas;
> >+ struct sctp_association *asoc = NULL;
> >+
> >+ /* User must provide at least the assoc id */
> >+ if (len < sizeof(sctp_assoc_t))
> >+ return -EINVAL;
> >+
> >+ if (copy_from_user(&sas, optval, len))
> >+ return -EFAULT;
> >+
> >+ asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
> >+ if (!asoc)
> >+ return -EINVAL;
> >+
> >+ sas.sas_rtxchunks = asoc->stats.rtxchunks;
> >+ sas.sas_gapcnt = asoc->stats.gapcnt;
> >+ sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
> >+ sas.sas_osacks = asoc->stats.osacks;
> >+ sas.sas_isacks = asoc->stats.isacks;
> >+ sas.sas_octrlchunks = asoc->stats.octrlchunks;
> >+ sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
> >+ sas.sas_oodchunks = asoc->stats.oodchunks;
> >+ sas.sas_iodchunks = asoc->stats.iodchunks;
> >+ sas.sas_ouodchunks = asoc->stats.ouodchunks;
> >+ sas.sas_iuodchunks = asoc->stats.iuodchunks;
> >+ sas.sas_idupchunks = asoc->stats.idupchunks;
> >+ sas.sas_opackets = asoc->stats.opackets;
> >+ sas.sas_ipackets = asoc->stats.ipackets;
> >+
> >+ memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
> >+ sizeof(struct sockaddr_storage));
> >+ /* New high max rto observed */
> >+ if (asoc->stats.max_obs_rto > asoc->stats.max_prev_obs_rto)
> >+ sas.sas_maxrto = asoc->stats.max_obs_rto;
> >+ else /* return min_rto since max rto has not changed */
> >+ sas.sas_maxrto = asoc->rto_min;
> >+
> >+ /* Record the value sent to the user this period */
> >+ asoc->stats.max_prev_obs_rto = sas.sas_maxrto;
> >+
> >+ /* Mark beginning of a new observation period */
> >+ asoc->stats.max_obs_rto = 0;
>
> I don't think the logic above behaves correctly. The fact that max_obs_rto
> < max_prev_obs_rto doesn't not mean that max_obs_rto has
> not changed. It just means that the networks had smaller latency this this
> time slice then it had in the privouse one. Returning rto_min is
> mis-information in this case.
Ack. I will look into fixing this as well.
Thanks again and regards,
Michele
>
> -vlad
>
> >+
> >+ /* Allow the struct to grow and fill in as much as possible */
> >+ len = min_t(size_t, len, sizeof(sas));
> >+
> >+ if (put_user(len, optlen))
> >+ return -EFAULT;
> >+
> >+ SCTP_DEBUG_PRINTK("sctp_getsockopt_assoc_stat(%d): %d\n",
> >+ len, sas.sas_assoc_id);
> >+
> >+ if (copy_to_user(optval, &sas, len))
> >+ return -EFAULT;
> >+
> >+ return 0;
> >+}
> >+
> > SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
> > char __user *optval, int __user *optlen)
> > {
> >@@ -5774,6 +5843,9 @@ SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
> > case SCTP_PEER_ADDR_THLDS:
> > retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
> > break;
> >+ case SCTP_GET_ASSOC_STATS:
> >+ retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
> >+ break;
> > default:
> > retval = -ENOPROTOOPT;
> > break;
> >diff --git a/net/sctp/transport.c b/net/sctp/transport.c
> >index 953c21e..8c6920d 100644
> >--- a/net/sctp/transport.c
> >+++ b/net/sctp/transport.c
> >@@ -350,6 +350,7 @@ void sctp_transport_update_rto(struct sctp_transport *tp, __u32 rtt)
> >
> > /* 6.3.1 C3) After the computation, update RTO <- SRTT + 4 * RTTVAR. */
> > tp->rto = tp->srtt + (tp->rttvar << 2);
> >+ sctp_max_rto(tp->asoc, tp);
> >
> > /* 6.3.1 C6) Whenever RTO is computed, if it is less than RTO.Min
> > * seconds then it is rounded up to RTO.Min seconds.
> >@@ -620,6 +621,7 @@ void sctp_transport_reset(struct sctp_transport *t)
> > t->burst_limited = 0;
> > t->ssthresh = asoc->peer.i.a_rwnd;
> > t->rto = asoc->rto_initial;
> >+ sctp_max_rto(asoc, t);
> > t->rtt = 0;
> > t->srtt = 0;
> > t->rttvar = 0;
> >
>
--
Michele Baldessari <michele@...syn.org>
C2A5 9DA3 9961 4FFB E01B D0BC DDD4 DCCB 7515 5C6D
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