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authorVladimir Oltean <vladimir.oltean@nxp.com>2019-11-14 17:03:23 +0200
committerDavid S. Miller <davem@davemloft.net>2019-11-15 12:32:16 -0800
commitfa914e9c4d9485f06b3676791a74587d2642fca3 (patch)
tree9969f8136d451e16349e9b25cd7d5e59297dc32b /drivers/net/ethernet/mscc
parentnet: mscc: ocelot: move invariant configs out of adjust_link (diff)
downloadlinux-dev-fa914e9c4d9485f06b3676791a74587d2642fca3.tar.xz
linux-dev-fa914e9c4d9485f06b3676791a74587d2642fca3.zip
net: mscc: ocelot: create a helper for changing the port MTU
Since in an NPI/DSA setup, not all ports will have the same MTU, we need to make sure the watermarks for pause frames and/or tail dropping logic that existed in the driver is still coherent for the new MTU values. We need to do this because the NPI (aka external CPU) port needs an increased MTU for the DSA tag. This will be done in a future patch. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/mscc')
-rw-r--r--drivers/net/ethernet/mscc/ocelot.c40
1 files changed, 23 insertions, 17 deletions
diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index 4558c09e2e8a..8ede8ad902c9 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -2097,11 +2097,32 @@ static int ocelot_init_timestamp(struct ocelot *ocelot)
return 0;
}
-static void ocelot_init_port(struct ocelot *ocelot, int port)
+static void ocelot_port_set_mtu(struct ocelot *ocelot, int port, size_t mtu)
{
struct ocelot_port *ocelot_port = ocelot->ports[port];
int atop_wm;
+ ocelot_port_writel(ocelot_port, mtu, DEV_MAC_MAXLEN_CFG);
+
+ /* Set Pause WM hysteresis
+ * 152 = 6 * mtu / OCELOT_BUFFER_CELL_SZ
+ * 101 = 4 * mtu / OCELOT_BUFFER_CELL_SZ
+ */
+ ocelot_write_rix(ocelot, SYS_PAUSE_CFG_PAUSE_ENA |
+ SYS_PAUSE_CFG_PAUSE_STOP(101) |
+ SYS_PAUSE_CFG_PAUSE_START(152), SYS_PAUSE_CFG, port);
+
+ /* Tail dropping watermark */
+ atop_wm = (ocelot->shared_queue_sz - 9 * mtu) / OCELOT_BUFFER_CELL_SZ;
+ ocelot_write_rix(ocelot, ocelot_wm_enc(9 * mtu),
+ SYS_ATOP, port);
+ ocelot_write(ocelot, ocelot_wm_enc(atop_wm), SYS_ATOP_TOT_CFG);
+}
+
+static void ocelot_init_port(struct ocelot *ocelot, int port)
+{
+ struct ocelot_port *ocelot_port = ocelot->ports[port];
+
INIT_LIST_HEAD(&ocelot_port->skbs);
/* Basic L2 initialization */
@@ -2122,8 +2143,7 @@ static void ocelot_init_port(struct ocelot *ocelot, int port)
DEV_MAC_HDX_CFG);
/* Set Max Length and maximum tags allowed */
- ocelot_port_writel(ocelot_port, VLAN_ETH_FRAME_LEN,
- DEV_MAC_MAXLEN_CFG);
+ ocelot_port_set_mtu(ocelot, port, VLAN_ETH_FRAME_LEN);
ocelot_port_writel(ocelot_port, DEV_MAC_TAGS_CFG_TAG_ID(ETH_P_8021AD) |
DEV_MAC_TAGS_CFG_VLAN_AWR_ENA |
DEV_MAC_TAGS_CFG_VLAN_LEN_AWR_ENA,
@@ -2133,20 +2153,6 @@ static void ocelot_init_port(struct ocelot *ocelot, int port)
ocelot_port_writel(ocelot_port, 0, DEV_MAC_FC_MAC_HIGH_CFG);
ocelot_port_writel(ocelot_port, 0, DEV_MAC_FC_MAC_LOW_CFG);
- /* Set Pause WM hysteresis
- * 152 = 6 * VLAN_ETH_FRAME_LEN / OCELOT_BUFFER_CELL_SZ
- * 101 = 4 * VLAN_ETH_FRAME_LEN / OCELOT_BUFFER_CELL_SZ
- */
- ocelot_write_rix(ocelot, SYS_PAUSE_CFG_PAUSE_ENA |
- SYS_PAUSE_CFG_PAUSE_STOP(101) |
- SYS_PAUSE_CFG_PAUSE_START(152), SYS_PAUSE_CFG, port);
-
- /* Tail dropping watermark */
- atop_wm = (ocelot->shared_queue_sz - 9 * VLAN_ETH_FRAME_LEN) / OCELOT_BUFFER_CELL_SZ;
- ocelot_write_rix(ocelot, ocelot_wm_enc(9 * VLAN_ETH_FRAME_LEN),
- SYS_ATOP, port);
- ocelot_write(ocelot, ocelot_wm_enc(atop_wm), SYS_ATOP_TOT_CFG);
-
/* Drop frames with multicast source address */
ocelot_rmw_gix(ocelot, ANA_PORT_DROP_CFG_DROP_MC_SMAC_ENA,
ANA_PORT_DROP_CFG_DROP_MC_SMAC_ENA,