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Date: Fri, 15 Jan 2021 13:05:47 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: Vladimir Oltean <vladimir.oltean@....com>
Cc: Tobias Waldekranz <tobias@...dekranz.com>,
"David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
UNGLinuxDriver@...rochip.com,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
Vivien Didelot <vivien.didelot@...il.com>,
Claudiu Manoil <claudiu.manoil@....com>
Subject: Re: [RFC PATCH net-next 12/16] net: mscc: ocelot: drop the use of
the "lags" array
On Tue, Dec 08, 2020 at 02:07:58PM +0200, Vladimir Oltean wrote:
> We can now simplify the implementation by always using ocelot_get_bond_mask
> to look up the other ports that are offloading the same bonding interface
> as us.
>
> In ocelot_set_aggr_pgids, the code had a way to uniquely iterate through
> LAGs. We need to achieve the same behavior by marking each LAG as visited,
> which we do now by temporarily allocating an array of pointers to bonding
> uppers of each port, and marking each bonding upper as NULL once it has
> been treated by the first port that is a member. And because we now do
> some dynamic allocation, we need to propagate errors from
> ocelot_set_aggr_pgid all the way to ocelot_port_lag_leave.
>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> ---
> drivers/net/ethernet/mscc/ocelot.c | 104 ++++++++++---------------
> drivers/net/ethernet/mscc/ocelot.h | 4 +-
> drivers/net/ethernet/mscc/ocelot_net.c | 4 +-
> include/soc/mscc/ocelot.h | 2 -
> 4 files changed, 47 insertions(+), 67 deletions(-)
>
> diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
> index 1a98c24af056..d4dbba66aa65 100644
> --- a/drivers/net/ethernet/mscc/ocelot.c
> +++ b/drivers/net/ethernet/mscc/ocelot.c
> @@ -909,21 +909,17 @@ static void ocelot_apply_bridge_fwd_mask(struct ocelot *ocelot)
> * source port's forwarding mask.
> */
> for (port = 0; port < ocelot->num_phys_ports; port++) {
> - if (ocelot->bridge_fwd_mask & BIT(port)) {
> - unsigned long mask = ocelot->bridge_fwd_mask & ~BIT(port);
> - int lag;
> + struct ocelot_port *ocelot_port = ocelot->ports[port];
>
> - for (lag = 0; lag < ocelot->num_phys_ports; lag++) {
> - unsigned long bond_mask = ocelot->lags[lag];
> + if (!ocelot_port)
> + continue;
>
> - if (!bond_mask)
> - continue;
> + if (ocelot->bridge_fwd_mask & BIT(port)) {
> + unsigned long mask = ocelot->bridge_fwd_mask & ~BIT(port);
> + struct net_device *bond = ocelot_port->bond;
>
> - if (bond_mask & BIT(port)) {
> - mask &= ~bond_mask;
> - break;
> - }
> - }
> + if (bond)
> + mask &= ~ocelot_get_bond_mask(ocelot, bond);
>
> ocelot_write_rix(ocelot, mask,
> ANA_PGID_PGID, PGID_SRC + port);
> @@ -1238,10 +1234,16 @@ int ocelot_port_bridge_leave(struct ocelot *ocelot, int port,
> }
> EXPORT_SYMBOL(ocelot_port_bridge_leave);
>
> -static void ocelot_set_aggr_pgids(struct ocelot *ocelot)
> +static int ocelot_set_aggr_pgids(struct ocelot *ocelot)
> {
> + struct net_device **bonds;
> int i, port, lag;
>
> + bonds = kcalloc(ocelot->num_phys_ports, sizeof(struct net_device *),
> + GFP_KERNEL);
> + if (!bonds)
> + return -ENOMEM;
> +
I remember somebody complaining about the temporary memory allocation
done here, but I can't seem to find that email for some reason.
Is it ok if I still keep the dynamic allocation there, though? Felix has
up to 5 user ports, Seville has up to 9, Ocelot up to 11. I would like
to not hardcode anything, in case (who knows!) more switches get added.
> /* Reset destination and aggregation PGIDS */
> for_each_unicast_dest_pgid(ocelot, port)
> ocelot_write_rix(ocelot, BIT(port), ANA_PGID_PGID, port);
> @@ -1250,16 +1252,26 @@ static void ocelot_set_aggr_pgids(struct ocelot *ocelot)
> ocelot_write_rix(ocelot, GENMASK(ocelot->num_phys_ports - 1, 0),
> ANA_PGID_PGID, i);
>
> + for (port = 0; port < ocelot->num_phys_ports; port++) {
> + struct ocelot_port *ocelot_port = ocelot->ports[port];
> +
> + if (!ocelot_port)
> + continue;
> +
> + bonds[port] = ocelot_port->bond;
> + }
> +
> /* Now, set PGIDs for each LAG */
> for (lag = 0; lag < ocelot->num_phys_ports; lag++) {
> unsigned long bond_mask;
> int aggr_count = 0;
> u8 aggr_idx[16];
>
> - bond_mask = ocelot->lags[lag];
> - if (!bond_mask)
> + if (!bonds[lag])
> continue;
>
> + bond_mask = ocelot_get_bond_mask(ocelot, bonds[lag]);
> +
> for_each_set_bit(port, &bond_mask, ocelot->num_phys_ports) {
> // Destination mask
> ocelot_write_rix(ocelot, bond_mask,
> @@ -1276,7 +1288,19 @@ static void ocelot_set_aggr_pgids(struct ocelot *ocelot)
> ac |= BIT(aggr_idx[i % aggr_count]);
> ocelot_write_rix(ocelot, ac, ANA_PGID_PGID, i);
> }
> +
> + /* Mark the bonding interface as visited to avoid applying
> + * the same config again
> + */
> + for (i = lag + 1; i < ocelot->num_phys_ports; i++)
> + if (bonds[i] == bonds[lag])
> + bonds[i] = NULL;
> +
> + bonds[lag] = NULL;
> }
> +
> + kfree(bonds);
> + return 0;
> }
>
> /* When offloading a bonding interface, the switch ports configured under the
> @@ -1315,59 +1339,22 @@ static void ocelot_setup_logical_port_ids(struct ocelot *ocelot)
> int ocelot_port_lag_join(struct ocelot *ocelot, int port,
> struct net_device *bond)
> {
> - u32 bond_mask = 0;
> - int lag;
> -
> ocelot->ports[port]->bond = bond;
>
> - bond_mask = ocelot_get_bond_mask(ocelot, bond);
> -
> - lag = __ffs(bond_mask);
> -
> - /* If the new port is the lowest one, use it as the logical port from
> - * now on
> - */
> - if (port == lag) {
> - ocelot->lags[port] = bond_mask;
> - bond_mask &= ~BIT(port);
> - if (bond_mask)
> - ocelot->lags[__ffs(bond_mask)] = 0;
> - } else {
> - ocelot->lags[lag] |= BIT(port);
> - }
> -
> ocelot_setup_logical_port_ids(ocelot);
> ocelot_apply_bridge_fwd_mask(ocelot);
> - ocelot_set_aggr_pgids(ocelot);
> -
> - return 0;
> + return ocelot_set_aggr_pgids(ocelot);
> }
> EXPORT_SYMBOL(ocelot_port_lag_join);
>
> -void ocelot_port_lag_leave(struct ocelot *ocelot, int port,
> - struct net_device *bond)
> +int ocelot_port_lag_leave(struct ocelot *ocelot, int port,
> + struct net_device *bond)
> {
> - int i;
> -
> ocelot->ports[port]->bond = NULL;
>
> - /* Remove port from any lag */
> - for (i = 0; i < ocelot->num_phys_ports; i++)
> - ocelot->lags[i] &= ~BIT(port);
> -
> - /* if it was the logical port of the lag, move the lag config to the
> - * next port
> - */
> - if (ocelot->lags[port]) {
> - int n = __ffs(ocelot->lags[port]);
> -
> - ocelot->lags[n] = ocelot->lags[port];
> - ocelot->lags[port] = 0;
> - }
> -
> ocelot_setup_logical_port_ids(ocelot);
> ocelot_apply_bridge_fwd_mask(ocelot);
> - ocelot_set_aggr_pgids(ocelot);
> + return ocelot_set_aggr_pgids(ocelot);
> }
> EXPORT_SYMBOL(ocelot_port_lag_leave);
>
> @@ -1543,11 +1530,6 @@ int ocelot_init(struct ocelot *ocelot)
> }
> }
>
> - ocelot->lags = devm_kcalloc(ocelot->dev, ocelot->num_phys_ports,
> - sizeof(u32), GFP_KERNEL);
> - if (!ocelot->lags)
> - return -ENOMEM;
> -
> ocelot->stats = devm_kcalloc(ocelot->dev,
> ocelot->num_phys_ports * ocelot->num_stats,
> sizeof(u64), GFP_KERNEL);
> diff --git a/drivers/net/ethernet/mscc/ocelot.h b/drivers/net/ethernet/mscc/ocelot.h
> index 739bd201d951..bef8d5f8e6e5 100644
> --- a/drivers/net/ethernet/mscc/ocelot.h
> +++ b/drivers/net/ethernet/mscc/ocelot.h
> @@ -114,8 +114,8 @@ int ocelot_mact_forget(struct ocelot *ocelot,
> const unsigned char mac[ETH_ALEN], unsigned int vid);
> int ocelot_port_lag_join(struct ocelot *ocelot, int port,
> struct net_device *bond);
> -void ocelot_port_lag_leave(struct ocelot *ocelot, int port,
> - struct net_device *bond);
> +int ocelot_port_lag_leave(struct ocelot *ocelot, int port,
> + struct net_device *bond);
> struct net_device *ocelot_port_to_netdev(struct ocelot *ocelot, int port);
> int ocelot_netdev_to_port(struct net_device *dev);
>
> diff --git a/drivers/net/ethernet/mscc/ocelot_net.c b/drivers/net/ethernet/mscc/ocelot_net.c
> index 77957328722a..93aaa631e347 100644
> --- a/drivers/net/ethernet/mscc/ocelot_net.c
> +++ b/drivers/net/ethernet/mscc/ocelot_net.c
> @@ -1035,8 +1035,8 @@ static int ocelot_netdevice_changeupper(struct net_device *dev,
> err = ocelot_port_lag_join(ocelot, port,
> info->upper_dev);
> else
> - ocelot_port_lag_leave(ocelot, port,
> - info->upper_dev);
> + err = ocelot_port_lag_leave(ocelot, port,
> + info->upper_dev);
> }
>
> return notifier_from_errno(err);
> diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
> index b812bdff1da1..0cd45659430f 100644
> --- a/include/soc/mscc/ocelot.h
> +++ b/include/soc/mscc/ocelot.h
> @@ -639,8 +639,6 @@ struct ocelot {
> enum ocelot_tag_prefix inj_prefix;
> enum ocelot_tag_prefix xtr_prefix;
>
> - u32 *lags;
> -
> struct list_head multicast;
> struct list_head pgids;
>
> --
> 2.25.1
>
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