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Date: Mon, 01 Jul 2013 11:35:03 -0400
From: Vlad Yasevich <vyasevich@...il.com>
To: Daniel Borkmann <dborkman@...hat.com>
CC: davem@...emloft.net, netdev@...r.kernel.org,
linux-sctp@...r.kernel.org, Neil Horman <nhorman@...driver.com>
Subject: Re: [PATCH net-next] net: sctp: get rid of SCTP_DBG_TSNS entirely
On 07/01/2013 05:31 AM, Daniel Borkmann wrote:
> After having reworked the debugging framework, Neil and Vlad agreed to
> get rid of the leftover SCTP_DBG_TSNS code for a couple of reasons:
>
> We can use systemtap scripts to investigate these things, we now have
> pr_debug() helpers that make life easier, and if we really need anything
> else besides those tools, we will be forced to come up with something
> better than we have there. Therefore, get rid of this ifdef debugging
> code entirely for now.
>
> Signed-off-by: Daniel Borkmann <dborkman@...hat.com>
> CC: Vlad Yasevich <vyasevich@...il.com>
Acked-by: Vlad Yasevich <vyasevich@...il.com>
We might replace this with either stap or update the sctp kprobe module
to include this info.
-vlad
> CC: Neil Horman <nhorman@...driver.com>
> ---
> On top of [PATCH net-next v4 0/2] Rework SCTP debugging framework.
>
> net/sctp/Kconfig | 9 -----
> net/sctp/outqueue.c | 105 ----------------------------------------------------
> 2 files changed, 114 deletions(-)
>
> diff --git a/net/sctp/Kconfig b/net/sctp/Kconfig
> index d80bf1a..71c1a59 100644
> --- a/net/sctp/Kconfig
> +++ b/net/sctp/Kconfig
> @@ -49,15 +49,6 @@ config NET_SCTPPROBE
> To compile this code as a module, choose M here: the
> module will be called sctp_probe.
>
> -config SCTP_DBG_TSNS
> - bool "SCTP: Debug transactions"
> - help
> - If you say Y, this will enable transaction debugging, visible
> - from the kernel's dynamic debugging framework.
> -
> - If unsure, say N. However, if you are running into problems, use
> - this option to gather outqueue trace information.
> -
> config SCTP_DBG_OBJCNT
> bool "SCTP: Debug object counts"
> depends on PROC_FS
> diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
> index 511b3b3..cb80a8e 100644
> --- a/net/sctp/outqueue.c
> +++ b/net/sctp/outqueue.c
> @@ -1335,21 +1335,6 @@ static void sctp_check_transmitted(struct sctp_outq *q,
> int bytes_acked = 0;
> int migrate_bytes = 0;
>
> - /* These state variables are for coherent debug output. --xguo */
> -
> -#ifdef CONFIG_SCTP_DBG_TSNS
> - __u32 dbg_ack_tsn = 0; /* An ACKed TSN range starts here... */
> - __u32 dbg_last_ack_tsn = 0; /* ...and finishes here. */
> - __u32 dbg_kept_tsn = 0; /* An un-ACKed range starts here... */
> - __u32 dbg_last_kept_tsn = 0; /* ...and finishes here. */
> -
> - /* 0 : The last TSN was ACKed.
> - * 1 : The last TSN was NOT ACKed (i.e. KEPT).
> - * -1: We need to initialize.
> - */
> - int dbg_prt_state = -1;
> -#endif /* CONFIG_SCTP_DBG_TSNS */
> -
> sack_ctsn = ntohl(sack->cum_tsn_ack);
>
> INIT_LIST_HEAD(&tlist);
> @@ -1471,49 +1456,6 @@ static void sctp_check_transmitted(struct sctp_outq *q,
> */
> list_add_tail(lchunk, &tlist);
> }
> -
> -#ifdef CONFIG_SCTP_DBG_TSNS
> - switch (dbg_prt_state) {
> - case 0: /* last TSN was ACKed */
> - if (dbg_last_ack_tsn + 1 == tsn) {
> - /* This TSN belongs to the
> - * current ACK range.
> - */
> - break;
> - }
> -
> - if (dbg_last_ack_tsn != dbg_ack_tsn) {
> - /* Display the end of the
> - * current range.
> - */
> - pr_cont("-%08x", dbg_last_ack_tsn);
> - }
> -
> - /* Start a new range. */
> - pr_cont(",%08x", tsn);
> - dbg_ack_tsn = tsn;
> - break;
> -
> - case 1: /* The last TSN was NOT ACKed. */
> - if (dbg_last_kept_tsn != dbg_kept_tsn) {
> - /* Display the end of current range. */
> - pr_cont("-%08x", dbg_last_kept_tsn);
> - }
> -
> - pr_cont("\n");
> - /* FALL THROUGH... */
> - default:
> - /* This is the first-ever TSN we examined. */
> - /* Start a new range of ACK-ed TSNs. */
> - pr_debug("ACKed: %08x", tsn);
> -
> - dbg_prt_state = 0;
> - dbg_ack_tsn = tsn;
> - }
> -
> - dbg_last_ack_tsn = tsn;
> -#endif /* CONFIG_SCTP_DBG_TSNS */
> -
> } else {
> if (tchunk->tsn_gap_acked) {
> pr_debug("%s: receiver reneged on data TSN:0x%x\n",
> @@ -1537,56 +1479,9 @@ static void sctp_check_transmitted(struct sctp_outq *q,
> }
>
> list_add_tail(lchunk, &tlist);
> -
> -#ifdef CONFIG_SCTP_DBG_TSNS
> - /* See the above comments on ACK-ed TSNs. */
> - switch (dbg_prt_state) {
> - case 1:
> - if (dbg_last_kept_tsn + 1 == tsn)
> - break;
> -
> - if (dbg_last_kept_tsn != dbg_kept_tsn)
> - pr_cont("-%08x", dbg_last_kept_tsn);
> -
> - pr_cont(",%08x", tsn);
> - dbg_kept_tsn = tsn;
> - break;
> -
> - case 0:
> - if (dbg_last_ack_tsn != dbg_ack_tsn)
> - pr_cont("-%08x", dbg_last_ack_tsn);
> -
> - pr_cont("\n");
> - /* FALL THROUGH... */
> - default:
> - pr_debug("KEPT: %08x", tsn);
> -
> - dbg_prt_state = 1;
> - dbg_kept_tsn = tsn;
> - }
> -
> - dbg_last_kept_tsn = tsn;
> -#endif /* CONFIG_SCTP_DBG_TSNS */
> }
> }
>
> -#ifdef CONFIG_SCTP_DBG_TSNS
> - /* Finish off the last range, displaying its ending TSN. */
> - switch (dbg_prt_state) {
> - case 0:
> - if (dbg_last_ack_tsn != dbg_ack_tsn)
> - pr_cont("-%08x\n", dbg_last_ack_tsn);
> - else
> - pr_cont("\n");
> - break;
> - case 1:
> - if (dbg_last_kept_tsn != dbg_kept_tsn)
> - pr_cont("-%08x\n", dbg_last_kept_tsn);
> - else
> - pr_cont("\n");
> - break;
> - }
> -#endif /* CONFIG_SCTP_DBG_TSNS */
> if (transport) {
> if (bytes_acked) {
> struct sctp_association *asoc = transport->asoc;
>
--
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