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Date: Thu, 7 Feb 2008 01:35:34 -0500
From: Christoph Hellwig <hch@...radead.org>
To: Ursula Braun <braunu@...ibm.com>
Cc: jgarzik@...ox.com, netdev@...r.kernel.org,
linux-s390@...r.kernel.org, Peter Tiedemann <ptiedem@...ibm.com>
Subject: Re: [patch 3/4] ctcm: infrastructure for replaced ctc driver
On Wed, Feb 06, 2008 at 07:27:26PM +0100, Ursula Braun wrote:
> From: Peter Tiedemann <ptiedem@...ibm.com>
>
> ctcm driver supports the channel-to-channel connections of the
> old ctc driver plus an additional MPC protocol to provide SNA
> connectivity.
>
> This new ctcm driver replaces the existing ctc driver.
>
> Signed-off-by: Peter Tiedemann <ptiedem@...ibm.com>
> Signed-off-by: Ursula Braun <braunu@...ibm.com>
> ---
>
> drivers/s390/net/Kconfig | 12
> drivers/s390/net/Makefile | 5
> drivers/s390/net/ctcm_dbug.c | 67 +
> drivers/s390/net/ctcm_dbug.h | 158 ++
> drivers/s390/net/ctcm_fsms.c | 2338 +++++++++++++++++++++++++++++++++++++++
> drivers/s390/net/ctcm_fsms.h | 359 ++++++
> drivers/s390/net/ctcm_main.c | 1772 ++++++++++++++++++++++++++++++
> drivers/s390/net/ctcm_main.h | 287 ++++
> drivers/s390/net/ctcm_mpc.c | 2467 ++++++++++++++++++++++++++++++++++++++++++
> drivers/s390/net/ctcm_mpc.h | 239 ++++
> drivers/s390/net/ctcm_sysfs.c | 210 +++
> 11 files changed, 7906 insertions(+), 8 deletions(-)
>
> Index: linux-2.6-uschi/drivers/s390/net/Makefile
> ===================================================================
> --- linux-2.6-uschi.orig/drivers/s390/net/Makefile
> +++ linux-2.6-uschi/drivers/s390/net/Makefile
> @@ -2,11 +2,10 @@
> # S/390 network devices
> #
>
> -ctc-objs := ctcmain.o ctcdbug.o
> -
> +ctcm-objs := ctcm_main.o ctcm_fsms.o ctcm_mpc.o ctcm_sysfs.o ctcm_dbug.o
please don't use foo-objs := but always foo-y +=
> Index: linux-2.6-uschi/drivers/s390/net/ctcm_dbug.c
> ===================================================================
> --- /dev/null
> +++ linux-2.6-uschi/drivers/s390/net/ctcm_dbug.c
> @@ -0,0 +1,67 @@
> +/*
> + * drivers/s390/net/ctcm_dbug.c
> + *
> + * Copyright IBM Corp. 2001, 2007
> + * Authors: Peter Tiedemann (ptiedem@...ibm.com)
> + *
> + */
Please don't mention filenames in the top of file comments.
On the other hand a little description of what this file
does would be quite useful. (This comment applies to all
files in this patch)
> +#ifdef DEBUG
> + #define do_debug 1
> +#else
> + #define do_debug 0
> +#endif
> +#ifdef DEBUGDATA
> + #define do_debug_data 1
> +#else
> + #define do_debug_data 0
> +#endif
> +#ifdef DEBUGCCW
> + #define do_debug_ccw 1
> +#else
> + #define do_debug_ccw 0
> +#endif
Please don't indent cpp directives with tabs. Normally we don't indent
them at all, but if we have to it's just a single space after the # per
indentiation level.
> +static void chx_rxidle(fsm_instance *fi, int event, void *arg);
Please don't put forward declarations in the middle of a file.
If you have to have them please put all somewhere at the top of the
file, but it would be even nicer to re-order the code to avoid
them completely.
> +/**
> + * Initialize connection by sending a __u16 of value 0.
> + *
> + * @param fi An instance of a channel statemachine.
> + * @param event The event, just happened.
> + * @param arg Generic pointer, casted from channel * upon call.
> + */
This is not a kerneldoc comment. Please read
Documentation/kernel-doc-nano-HOWTO.txt for the correct format, and run
it through the extraction script to make sure it's valid.
> +static void chx_firstio(fsm_instance *fi, int event, void *arg)
> +{
> + struct channel *ch = (struct channel *)arg;
no cast needed when converting to/from void *
> + struct channel *ch = (struct channel *)arg;
> + struct channel *ch2;
> + struct net_device *dev = ch->netdev;
> +
> + CTCM_DBF_DEV_NAME(TRACE, dev, "Got remote disconnect, re-initializing");
> + fsm_deltimer(&ch->timer);
> + if (do_debug)
> + ctcm_pr_debug("%s: Got remote disconnect, "
> + "re-initializing ...\n", dev->name);
> + /*
> + * Notify device statemachine
> + */
> + fsm_event(((struct ctcm_priv *)dev->priv)->fsm, DEV_EVENT_RXDOWN, dev);
> + fsm_event(((struct ctcm_priv *)dev->priv)->fsm, DEV_EVENT_TXDOWN, dev);
> +
> + fsm_newstate(fi, CTC_STATE_DTERM);
> + ch2 = ((struct ctcm_priv *)dev->priv)->channel[WRITE];
keeping a local variable of type struct ctcm_priv * would be a lot
cleaner than all these casts. This applies to a lot of functions all
over this patch.
> + fsm_newstate(ch2->fsm, CTC_STATE_DTERM);
> +
> + ccw_device_halt(ch->cdev, (unsigned long)ch);
> + ccw_device_halt(ch2->cdev, (unsigned long)ch2);
what an odd calling convention. Why does ccw_device_halt take an
unsigned long argument that's actually a pointer?
> + header = kzalloc(TH_HEADER_LENGTH, gfp_type());
> +
> + if (!header) {
> + printk(KERN_WARNING "ctcmpc: OUT OF MEMORY IN %s()"
> + ": Data Lost \n", __FUNCTION__);
> + spin_unlock(&ch->collect_lock);
> + fsm_event(privptr->mpcg->fsm, MPCG_EVENT_INOP, dev);
> + goto done;
odd indentation messup.
> + min((int)ch->trans_skb->len, 50));
please don't case arguments to min but use min_t instead.
I gave up here for now, but you should probably run this through
checkpatch.pl aswell before resubmitting it.
--
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