net: ti: icssg-prueth: Fix fdb hash size configuration

The ICSSG driver does the initial FDB configuration which
includes setting the control registers. Other run time
management like learning is managed by the PRU's. The default
FDB hash size used by the firmware is 512 slots, which is
currently missing in the current driver. Update the driver
FDB config to include FDB hash size as well.

Please refer trm [1] 6.4.14.12.17 section on how the FDB config
register gets configured. From the table 6-1404, there is a reset
field for FDB_HAS_SIZE which is 4, meaning 1024 slots. Currently
the driver is not updating this reset value from 4(1024 slots) to
3(512 slots). This patch fixes this by updating the reset value
to 512 slots.

[1]: https://www.ti.com/lit/pdf/spruim2
Fixes: abd5576b9c57f ("net: ti: icssg-prueth: Add support for ICSSG switch firmware")
Signed-off-by: Meghana Malladi <m-malladi@ti.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20251104104415.3110537-1-m-malladi@ti.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/ti/icssg/icssg_config.c b/drivers/net/ethernet/ti/icssg/icssg_config.c
index da53eb04b0a43dd2baed05d7c46cdfceaf0f0100..3f8237c17d099ee36a96fec8727c79f04d478cb1 100644 (file)
--- a/drivers/net/ethernet/ti/icssg/icssg_config.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_config.c
@@ -66,6 +66,9 @@
 #define FDB_GEN_CFG1           0x60
 #define SMEM_VLAN_OFFSET       8
 #define SMEM_VLAN_OFFSET_MASK  GENMASK(25, 8)
+#define FDB_HASH_SIZE_MASK     GENMASK(6, 3)
+#define FDB_HASH_SIZE_SHIFT    3
+#define FDB_HASH_SIZE          3
 
 #define FDB_GEN_CFG2           0x64
 #define FDB_VLAN_EN            BIT(6)
@@ -463,6 +466,8 @@ void icssg_init_emac_mode(struct prueth *prueth)
        /* Set VLAN TABLE address base */
        regmap_update_bits(prueth->miig_rt, FDB_GEN_CFG1, SMEM_VLAN_OFFSET_MASK,
                           addr <<  SMEM_VLAN_OFFSET);
+       regmap_update_bits(prueth->miig_rt, FDB_GEN_CFG1, FDB_HASH_SIZE_MASK,
+                          FDB_HASH_SIZE << FDB_HASH_SIZE_SHIFT);
        /* Set enable VLAN aware mode, and FDBs for all PRUs */
        regmap_write(prueth->miig_rt, FDB_GEN_CFG2, (FDB_PRU0_EN | FDB_PRU1_EN | FDB_HOST_EN));
        prueth->vlan_tbl = (struct prueth_vlan_tbl __force *)(prueth->shram.va +
@@ -484,6 +489,8 @@ void icssg_init_fw_offload_mode(struct prueth *prueth)
        /* Set VLAN TABLE address base */
        regmap_update_bits(prueth->miig_rt, FDB_GEN_CFG1, SMEM_VLAN_OFFSET_MASK,
                           addr <<  SMEM_VLAN_OFFSET);
+       regmap_update_bits(prueth->miig_rt, FDB_GEN_CFG1, FDB_HASH_SIZE_MASK,
+                          FDB_HASH_SIZE << FDB_HASH_SIZE_SHIFT);
        /* Set enable VLAN aware mode, and FDBs for all PRUs */
        regmap_write(prueth->miig_rt, FDB_GEN_CFG2, FDB_EN_ALL);
        prueth->vlan_tbl = (struct prueth_vlan_tbl __force *)(prueth->shram.va +