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Date: Mon, 14 Aug 2017 11:39:52 +0930
From: Joel Stanley <joel@....id.au>
To: Samuel Mendoza-Jonas <sam@...dozajonas.com>
Cc: "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Gavin Shan <gwshan@...ux.vnet.ibm.com>,
Ratan K Gupta <ratagupt@...ibm.com>
Subject: Re: [PATCH net-next v2 2/3] net/ncsi: Configure VLAN tag filter
On Mon, Aug 14, 2017 at 10:59 AM, Samuel Mendoza-Jonas
<sam@...dozajonas.com> wrote:
> Make use of the ndo_vlan_rx_{add,kill}_vid callbacks to have the NCSI
> stack process new VLAN tags and configure the channel VLAN filter
> appropriately.
> Several VLAN tags can be set and a "Set VLAN Filter" packet must be sent
> for each one, meaning the ncsi_dev_state_config_svf state must be
> repeated. An internal list of VLAN tags is maintained, and compared
> against the current channel's ncsi_channel_filter in order to keep track
> within the state. VLAN filters are removed in a similar manner, with the
> introduction of the ncsi_dev_state_config_clear_vids state. The maximum
> number of VLAN tag filters is determined by the "Get Capabilities"
> response from the channel.
>
> Signed-off-by: Samuel Mendoza-Jonas <sam@...dozajonas.com>
I've given this some testing, but there are a few things I saw below
that we should sort out.
> --- a/net/ncsi/ncsi-manage.c
> +++ b/net/ncsi/ncsi-manage.c
> @@ -38,6 +38,22 @@ static inline int ncsi_filter_size(int table)
> return sizes[table];
> }
>
> +u32 *ncsi_get_filter(struct ncsi_channel *nc, int table, int index)
> +{
> + struct ncsi_channel_filter *ncf;
> + int size;
> +
> + ncf = nc->filters[table];
> + if (!ncf)
> + return NULL;
> +
> + size = ncsi_filter_size(table);
> + if (size < 0)
> + return NULL;
> +
> + return ncf->data + size * index;
> +}
> +
> int ncsi_find_filter(struct ncsi_channel *nc, int table, void *data)
> {
> struct ncsi_channel_filter *ncf;
> @@ -58,7 +74,7 @@ int ncsi_find_filter(struct ncsi_channel *nc, int table, void *data)
> index = -1;
> while ((index = find_next_bit(bitmap, ncf->total, index + 1))
> < ncf->total) {
> - if (!memcmp(ncf->data + size * index, data, size)) {
> + if (!data || !memcmp(ncf->data + size * index, data, size)) {
Not clear why this check is required?
> spin_unlock_irqrestore(&nc->lock, flags);
> return index;
> }
> @@ -639,6 +655,83 @@ static void ncsi_suspend_channel(struct ncsi_dev_priv *ndp)
> nd->state = ncsi_dev_state_functional;
> }
>
> +/* Check the VLAN filter bitmap for a set filter, and construct a
> + * "Set VLAN Filter - Disable" packet if found.
> + */
> +static int clear_one_vid(struct ncsi_dev_priv *ndp, struct ncsi_channel *nc,
> + struct ncsi_cmd_arg *nca)
> +{
> + int index;
> + u16 vid;
> +
> + index = ncsi_find_filter(nc, NCSI_FILTER_VLAN, NULL);
> + if (index < 0) {
> + /* Filter table empty */
> + return -1;
> + }
> +
> + vid = *(u16 *)ncsi_get_filter(nc, NCSI_FILTER_VLAN, index);
You just added this function that returns a pointer to a u32. It's
strange to see the only call site then throw half of it away.
Also, ncsi_get_filter can return NULL.
> + netdev_printk(KERN_DEBUG, ndp->ndev.dev,
> + "ncsi: removed vlan tag %u at index %d\n",
> + vid, index + 1);
> + ncsi_remove_filter(nc, NCSI_FILTER_VLAN, index);
> +
> + nca->type = NCSI_PKT_CMD_SVF;
> + nca->words[1] = vid;
> + /* HW filter index starts at 1 */
> + nca->bytes[6] = index + 1;
> + nca->bytes[7] = 0x00;
> + return 0;
> +}
> @@ -751,6 +876,26 @@ static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
> break;
> case ncsi_dev_state_config_done:
> spin_lock_irqsave(&nc->lock, flags);
> + if (nc->reconfigure_needed) {
> + /* This channel's configuration has been updated
> + * part-way during the config state - start the
> + * channel configuration over
> + */
> + nc->reconfigure_needed = false;
> + nc->state = NCSI_CHANNEL_INVISIBLE;
> + spin_unlock_irqrestore(&nc->lock, flags);
> +
> + spin_lock_irqsave(&ndp->lock, flags);
> + nc->state = NCSI_CHANNEL_INACTIVE;
This looks strange. What's nc->state up to? Does setting it to
NCSI_CHANNEL_INVISIBLE have any affect?
The locking is confusing too.
> + list_add_tail_rcu(&nc->link, &ndp->channel_queue);
> + spin_unlock_irqrestore(&ndp->lock, flags);
> +
> + netdev_printk(KERN_DEBUG, dev,
> + "Dirty NCSI channel state reset\n");
> + ncsi_process_next_channel(ndp);
> + break;
> + }
> +
> if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1) {
> hot_nc = nc;
> nc->state = NCSI_CHANNEL_ACTIVE;
> @@ -1191,6 +1336,149 @@ static struct notifier_block ncsi_inet6addr_notifier = {
> };
> #endif /* CONFIG_IPV6 */
>
> +static int ncsi_kick_channels(struct ncsi_dev_priv *ndp)
> +{
> + struct ncsi_dev *nd = &ndp->ndev;
> + struct ncsi_channel *nc;
> + struct ncsi_package *np;
> + unsigned long flags;
> + unsigned int n = 0;
> +
> + NCSI_FOR_EACH_PACKAGE(ndp, np) {
> + NCSI_FOR_EACH_CHANNEL(np, nc) {
> + spin_lock_irqsave(&nc->lock, flags);
> +
> + /* Channels may be busy, mark dirty instead of
> + * kicking if;
> + * a) not ACTIVE (configured)
> + * b) in the channel_queue (to be configured)
> + * c) it's ndev is in the config state
> + */
> + if (nc->state != NCSI_CHANNEL_ACTIVE) {
> + if ((ndp->ndev.state & 0xff00) ==
> + ncsi_dev_state_config ||
> + !list_empty(&nc->link)) {
> + netdev_printk(KERN_DEBUG, nd->dev,
> + "ncsi: channel %p marked dirty\n",
> + nc);
> + nc->reconfigure_needed = true;
> + }
> + spin_unlock_irqrestore(&nc->lock, flags);
> + continue;
> + }
> +
> + spin_unlock_irqrestore(&nc->lock, flags);
> +
> + ncsi_stop_channel_monitor(nc);
> + spin_lock_irqsave(&nc->lock, flags);
> + nc->state = NCSI_CHANNEL_INVISIBLE;
> + spin_unlock_irqrestore(&nc->lock, flags);
> +
> + spin_lock_irqsave(&ndp->lock, flags);
> + nc->state = NCSI_CHANNEL_INACTIVE;
This is a similar pattern to ncsi_configure_channel. I suspect the
answer there will be the same as here.
> + list_add_tail_rcu(&nc->link, &ndp->channel_queue);
> + spin_unlock_irqrestore(&ndp->lock, flags);
> +
> + netdev_printk(KERN_DEBUG, nd->dev,
> + "ncsi: kicked channel %p\n", nc);
> + n++;
> + }
> + }
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