[PATCH net-next] net: ethernet: ti: cpsw: use for mcast entries only host port

[PATCH net-next] net: ethernet: ti: cpsw: use for mcast entries only host port

[Ivan Khoronzhuk]

In dual-emac mode the cpsw driver sends directed packets, that means
that packets go to the directed port, but an ALE lookup is performed
to determine untagged egress only. It means that on tx side no need
to add port bit for ALE mcast entry mask, and basically ALE entry
for port identification is needed only on rx side.

So, add only host port in dual_emac mode as used directed
transmission, and no need in one more port. For single port boards
and switch mode all ports used, as usual, so no changes for them.
Also it simplifies farther changes.

In other words, mcast entries for dual-emac should behave exactly
like unicast. It also can help avoid leaking packets between ports
with same vlan on h/w level if ports could became members of same vid.

So now, for instance, if mcast address 33:33:00:00:00:01 is added then
entries in ALE table:

vid = 1, addr = 33:33:00:00:00:01, port_mask = 0x1
vid = 2, addr = 33:33:00:00:00:01, port_mask = 0x1

Instead of:
vid = 1, addr = 33:33:00:00:00:01, port_mask = 0x3
vid = 2, addr = 33:33:00:00:00:01, port_mask = 0x5

With the same considerations, set only host port for unregistered
mcast for dual-emac mode in case of IFF_ALLMULTI is set, exactly like
it's done in cpsw_ale_set_allmulti().

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
---

Based on net-next/master

 drivers/net/ethernet/ti/cpsw.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index 16dcbf36f8cc..7bfb7ee3a261 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -576,10 +576,8 @@ static void cpsw_add_mcast(struct cpsw_priv *priv, u8 *addr)
 
 	if (cpsw->data.dual_emac) {
 		struct cpsw_slave *slave = cpsw->slaves + priv->emac_port;
-		int slave_port = cpsw_get_slave_port(slave->slave_num);
 
-		cpsw_ale_add_mcast(cpsw->ale, addr,
-				   1 << slave_port | ALE_PORT_HOST,
+		cpsw_ale_add_mcast(cpsw->ale, addr, ALE_PORT_HOST,
 				   ALE_VLAN, slave->port_vlan, 0);
 		return;
 	}
@@ -1410,7 +1408,7 @@ static inline void cpsw_add_dual_emac_def_ale_entries(
 	cpsw_ale_add_vlan(cpsw->ale, slave->port_vlan, port_mask,
 			  port_mask, port_mask, 0);
 	cpsw_ale_add_mcast(cpsw->ale, priv->ndev->broadcast,
-			   port_mask, ALE_VLAN, slave->port_vlan, 0);
+			   ALE_PORT_HOST, ALE_VLAN, slave->port_vlan, 0);
 	cpsw_ale_add_ucast(cpsw->ale, priv->mac_addr,
 			   HOST_PORT_NUM, ALE_VLAN |
 			   ALE_SECURE, slave->port_vlan);
@@ -2293,16 +2291,19 @@ static inline int cpsw_add_vlan_ale_entry(struct cpsw_priv *priv,
 {
 	int ret;
 	int unreg_mcast_mask = 0;
+	int mcast_mask;
 	u32 port_mask;
 	struct cpsw_common *cpsw = priv->cpsw;
 
 	if (cpsw->data.dual_emac) {
 		port_mask = (1 << (priv->emac_port + 1)) | ALE_PORT_HOST;
 
+		mcast_mask = ALE_PORT_HOST;
 		if (priv->ndev->flags & IFF_ALLMULTI)
-			unreg_mcast_mask = port_mask;
+			unreg_mcast_mask = mcast_mask;
 	} else {
 		port_mask = ALE_ALL_PORTS;
+		mcast_mask = port_mask;
 
 		if (priv->ndev->flags & IFF_ALLMULTI)
 			unreg_mcast_mask = ALE_ALL_PORTS;
@@ -2321,7 +2322,7 @@ static inline int cpsw_add_vlan_ale_entry(struct cpsw_priv *priv,
 		goto clean_vid;
 
 	ret = cpsw_ale_add_mcast(cpsw->ale, priv->ndev->broadcast,
-				 port_mask, ALE_VLAN, vid, 0);
+				 mcast_mask, ALE_VLAN, vid, 0);
 	if (ret != 0)
 		goto clean_vlan_ucast;
 	return 0;
-- 
2.17.1

Re: [PATCH net-next] net: ethernet: ti: cpsw: use for mcast entries only host port

[Grygorii Strashko]

On 10/12/2018 11:06 AM, Ivan Khoronzhuk wrote:
> In dual-emac mode the cpsw driver sends directed packets, that means
> that packets go to the directed port, but an ALE lookup is performed
> to determine untagged egress only. It means that on tx side no need
> to add port bit for ALE mcast entry mask, and basically ALE entry
> for port identification is needed only on rx side.
> 
> So, add only host port in dual_emac mode as used directed
> transmission, and no need in one more port. For single port boards
> and switch mode all ports used, as usual, so no changes for them.
> Also it simplifies farther changes.
> 
> In other words, mcast entries for dual-emac should behave exactly
> like unicast. It also can help avoid leaking packets between ports
> with same vlan on h/w level if ports could became members of same vid.
> 
> So now, for instance, if mcast address 33:33:00:00:00:01 is added then
> entries in ALE table:
> 
> vid = 1, addr = 33:33:00:00:00:01, port_mask = 0x1
> vid = 2, addr = 33:33:00:00:00:01, port_mask = 0x1
> 
> Instead of:
> vid = 1, addr = 33:33:00:00:00:01, port_mask = 0x3
> vid = 2, addr = 33:33:00:00:00:01, port_mask = 0x5
> 
> With the same considerations, set only host port for unregistered
> mcast for dual-emac mode in case of IFF_ALLMULTI is set, exactly like
> it's done in cpsw_ale_set_allmulti().
> 
> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
> ---
> 
> Based on net-next/master



Thank you.
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>

-- 
regards,
-grygorii

Re: [PATCH net-next] net: ethernet: ti: cpsw: use for mcast entries only host port

[David Miller]

From: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Date: Fri, 12 Oct 2018 19:06:29 +0300

> In dual-emac mode the cpsw driver sends directed packets, that means
> that packets go to the directed port, but an ALE lookup is performed
> to determine untagged egress only. It means that on tx side no need
> to add port bit for ALE mcast entry mask, and basically ALE entry
> for port identification is needed only on rx side.
> 
> So, add only host port in dual_emac mode as used directed
> transmission, and no need in one more port. For single port boards
> and switch mode all ports used, as usual, so no changes for them.
> Also it simplifies farther changes.
> 
> In other words, mcast entries for dual-emac should behave exactly
> like unicast. It also can help avoid leaking packets between ports
> with same vlan on h/w level if ports could became members of same vid.
> 
> So now, for instance, if mcast address 33:33:00:00:00:01 is added then
> entries in ALE table:
> 
> vid = 1, addr = 33:33:00:00:00:01, port_mask = 0x1
> vid = 2, addr = 33:33:00:00:00:01, port_mask = 0x1
> 
> Instead of:
> vid = 1, addr = 33:33:00:00:00:01, port_mask = 0x3
> vid = 2, addr = 33:33:00:00:00:01, port_mask = 0x5
> 
> With the same considerations, set only host port for unregistered
> mcast for dual-emac mode in case of IFF_ALLMULTI is set, exactly like
> it's done in cpsw_ale_set_allmulti().
> 
> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>

Applied.