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SubjectRe: [PATCH] net/ncsi: Disable global multicast filter
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On Thu, 2019-09-12 at 12:04 -0700, Vijay Khemka wrote:
> Disabling multicast filtering from NCSI if it is supported. As it
> should not filter any multicast packets. In current code, multicast
> filter is enabled and with an exception of optional field supported
> by device are disabled filtering.
>
> Mainly I see if goal is to disable filtering for IPV6 packets then
> let
> it disabled for every other types as well. As we are seeing issues
> with
> LLDP not working with this enabled filtering. And there are other
> issues
> with IPV6.
>
> By Disabling this multicast completely, it is working for both IPV6
> as
> well as LLDP.
>
> Signed-off-by: Vijay Khemka <vijaykhemka@fb.com>

Hi Vijay,

There are definitely some current issues with multicast filtering and
IPv6 when behind NC-SI at the moment. It would be nice to make this
configurable instead of disabling the component wholesale but I don't
believe this actually *breaks* anyone's configuration. It would be nice
to see some Tested-By's from the OpenBMC people though.

I'll have a look at the multicast issues, CC'ing in Chris too who IIRC
was looking at similar issues for u-bmc in case he got further.

Acked-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>

> ---
> net/ncsi/internal.h | 7 +--
> net/ncsi/ncsi-manage.c | 98 +++++-----------------------------------
> --
> 2 files changed, 12 insertions(+), 93 deletions(-)
>
> diff --git a/net/ncsi/internal.h b/net/ncsi/internal.h
> index 0b3f0673e1a2..ad3fd7f1da75 100644
> --- a/net/ncsi/internal.h
> +++ b/net/ncsi/internal.h
> @@ -264,9 +264,7 @@ enum {
> ncsi_dev_state_config_ev,
> ncsi_dev_state_config_sma,
> ncsi_dev_state_config_ebf,
> -#if IS_ENABLED(CONFIG_IPV6)
> - ncsi_dev_state_config_egmf,
> -#endif
> + ncsi_dev_state_config_dgmf,
> ncsi_dev_state_config_ecnt,
> ncsi_dev_state_config_ec,
> ncsi_dev_state_config_ae,
> @@ -295,9 +293,6 @@ struct ncsi_dev_priv {
> #define NCSI_DEV_RESET 8 /* Reset state of
> NC */
> unsigned int gma_flag; /* OEM GMA
> flag */
> spinlock_t lock; /* Protect the NCSI
> device */
> -#if IS_ENABLED(CONFIG_IPV6)
> - unsigned int inet6_addr_num; /* Number of IPv6
> addresses */
> -#endif
> unsigned int package_probe_id;/* Current ID during
> probe */
> unsigned int package_num; /* Number of
> packages */
> struct list_head packages; /* List of
> packages */
> diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c
> index 755aab66dcab..bce8b443289d 100644
> --- a/net/ncsi/ncsi-manage.c
> +++ b/net/ncsi/ncsi-manage.c
> @@ -14,7 +14,6 @@
> #include <net/sock.h>
> #include <net/addrconf.h>
> #include <net/ipv6.h>
> -#include <net/if_inet6.h>
> #include <net/genetlink.h>
>
> #include "internal.h"
> @@ -978,9 +977,7 @@ static void ncsi_configure_channel(struct
> ncsi_dev_priv *ndp)
> case ncsi_dev_state_config_ev:
> case ncsi_dev_state_config_sma:
> case ncsi_dev_state_config_ebf:
> -#if IS_ENABLED(CONFIG_IPV6)
> - case ncsi_dev_state_config_egmf:
> -#endif
> + case ncsi_dev_state_config_dgmf:
> case ncsi_dev_state_config_ecnt:
> case ncsi_dev_state_config_ec:
> case ncsi_dev_state_config_ae:
> @@ -1033,23 +1030,23 @@ static void ncsi_configure_channel(struct
> ncsi_dev_priv *ndp)
> } else if (nd->state == ncsi_dev_state_config_ebf) {
> nca.type = NCSI_PKT_CMD_EBF;
> nca.dwords[0] = nc->caps[NCSI_CAP_BC].cap;
> - if (ncsi_channel_is_tx(ndp, nc))
> + /* if multicast global filtering is supported
> then
> + * disable it so that all multicast packet will
> be
> + * forwarded to management controller
> + */
> + if (nc->caps[NCSI_CAP_GENERIC].cap &
> + NCSI_CAP_GENERIC_MC)
> + nd->state = ncsi_dev_state_config_dgmf;
> + else if (ncsi_channel_is_tx(ndp, nc))
> nd->state = ncsi_dev_state_config_ecnt;
> else
> nd->state = ncsi_dev_state_config_ec;
> -#if IS_ENABLED(CONFIG_IPV6)
> - if (ndp->inet6_addr_num > 0 &&
> - (nc->caps[NCSI_CAP_GENERIC].cap &
> - NCSI_CAP_GENERIC_MC))
> - nd->state = ncsi_dev_state_config_egmf;
> - } else if (nd->state == ncsi_dev_state_config_egmf) {
> - nca.type = NCSI_PKT_CMD_EGMF;
> - nca.dwords[0] = nc->caps[NCSI_CAP_MC].cap;
> + } else if (nd->state == ncsi_dev_state_config_dgmf) {
> + nca.type = NCSI_PKT_CMD_DGMF;
> if (ncsi_channel_is_tx(ndp, nc))
> nd->state = ncsi_dev_state_config_ecnt;
> else
> nd->state = ncsi_dev_state_config_ec;
> -#endif /* CONFIG_IPV6 */
> } else if (nd->state == ncsi_dev_state_config_ecnt) {
> if (np->preferred_channel &&
> nc != np->preferred_channel)
> @@ -1483,70 +1480,6 @@ int ncsi_process_next_channel(struct
> ncsi_dev_priv *ndp)
> return -ENODEV;
> }
>
> -#if IS_ENABLED(CONFIG_IPV6)
> -static int ncsi_inet6addr_event(struct notifier_block *this,
> - unsigned long event, void *data)
> -{
> - struct inet6_ifaddr *ifa = data;
> - struct net_device *dev = ifa->idev->dev;
> - struct ncsi_dev *nd = ncsi_find_dev(dev);
> - struct ncsi_dev_priv *ndp = nd ? TO_NCSI_DEV_PRIV(nd) : NULL;
> - struct ncsi_package *np;
> - struct ncsi_channel *nc;
> - struct ncsi_cmd_arg nca;
> - bool action;
> - int ret;
> -
> - if (!ndp || (ipv6_addr_type(&ifa->addr) &
> - (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK)))
> - return NOTIFY_OK;
> -
> - switch (event) {
> - case NETDEV_UP:
> - action = (++ndp->inet6_addr_num) == 1;
> - nca.type = NCSI_PKT_CMD_EGMF;
> - break;
> - case NETDEV_DOWN:
> - action = (--ndp->inet6_addr_num == 0);
> - nca.type = NCSI_PKT_CMD_DGMF;
> - break;
> - default:
> - return NOTIFY_OK;
> - }
> -
> - /* We might not have active channel or packages. The IPv6
> - * required multicast will be enabled when active channel
> - * or packages are chosen.
> - */
> - np = ndp->active_package;
> - nc = ndp->active_channel;
> - if (!action || !np || !nc)
> - return NOTIFY_OK;
> -
> - /* We needn't enable or disable it if the function isn't
> supported */
> - if (!(nc->caps[NCSI_CAP_GENERIC].cap & NCSI_CAP_GENERIC_MC))
> - return NOTIFY_OK;
> -
> - nca.ndp = ndp;
> - nca.req_flags = 0;
> - nca.package = np->id;
> - nca.channel = nc->id;
> - nca.dwords[0] = nc->caps[NCSI_CAP_MC].cap;
> - ret = ncsi_xmit_cmd(&nca);
> - if (ret) {
> - netdev_warn(dev, "Fail to %s global multicast filter
> (%d)\n",
> - (event == NETDEV_UP) ? "enable" :
> "disable", ret);
> - return NOTIFY_DONE;
> - }
> -
> - return NOTIFY_OK;
> -}
> -
> -static struct notifier_block ncsi_inet6addr_notifier = {
> - .notifier_call = ncsi_inet6addr_event,
> -};
> -#endif /* CONFIG_IPV6 */
> -
> static int ncsi_kick_channels(struct ncsi_dev_priv *ndp)
> {
> struct ncsi_dev *nd = &ndp->ndev;
> @@ -1725,11 +1658,6 @@ struct ncsi_dev *ncsi_register_dev(struct
> net_device *dev,
> }
>
> spin_lock_irqsave(&ncsi_dev_lock, flags);
> -#if IS_ENABLED(CONFIG_IPV6)
> - ndp->inet6_addr_num = 0;
> - if (list_empty(&ncsi_dev_list))
> - register_inet6addr_notifier(&ncsi_inet6addr_notifier);
> -#endif
> list_add_tail_rcu(&ndp->node, &ncsi_dev_list);
> spin_unlock_irqrestore(&ncsi_dev_lock, flags);
>
> @@ -1896,10 +1824,6 @@ void ncsi_unregister_dev(struct ncsi_dev *nd)
>
> spin_lock_irqsave(&ncsi_dev_lock, flags);
> list_del_rcu(&ndp->node);
> -#if IS_ENABLED(CONFIG_IPV6)
> - if (list_empty(&ncsi_dev_list))
> - unregister_inet6addr_notifier(&ncsi_inet6addr_notifier)
> ;
> -#endif
> spin_unlock_irqrestore(&ncsi_dev_lock, flags);
>
> ncsi_unregister_netlink(nd->dev);

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