net: airoha: ppe: Configure SRAM PPE entries via the cpu

Introduce airoha_ppe_foe_commit_sram_entry routine in order to configure
the SRAM PPE entries directly via the CPU instead of using the NPU APIs.
This is a preliminary patch to enable netfilter flowtable hw offload for
AN7583 SoC.

Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/20251017-an7583-eth-support-v3-8-f28319666667@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/drivers/net/ethernet/airoha/airoha_ppe.c b/drivers/net/ethernet/airoha/airoha_ppe.c
index 195d97e61197e5c393f2e79f33f685c334612a83..46755bc60a8e822b296e188c061c45eae0b88cb5 100644 (file)
--- a/drivers/net/ethernet/airoha/airoha_ppe.c
+++ b/drivers/net/ethernet/airoha/airoha_ppe.c
@@ -656,6 +656,27 @@ static bool airoha_ppe_foe_compare_entry(struct airoha_flow_table_entry *e,
        return !memcmp(&e->data.d, &hwe->d, len - sizeof(hwe->ib1));
 }
 
+static int airoha_ppe_foe_commit_sram_entry(struct airoha_ppe *ppe, u32 hash)
+{
+       struct airoha_foe_entry *hwe = ppe->foe + hash * sizeof(*hwe);
+       bool ppe2 = hash >= PPE_SRAM_NUM_ENTRIES;
+       u32 *ptr = (u32 *)hwe, val;
+       int i;
+
+       for (i = 0; i < sizeof(*hwe) / sizeof(*ptr); i++)
+               airoha_fe_wr(ppe->eth, REG_PPE_RAM_ENTRY(ppe2, i), ptr[i]);
+
+       wmb();
+       airoha_fe_wr(ppe->eth, REG_PPE_RAM_CTRL(ppe2),
+                    FIELD_PREP(PPE_SRAM_CTRL_ENTRY_MASK, hash) |
+                    PPE_SRAM_CTRL_WR_MASK | PPE_SRAM_CTRL_REQ_MASK);
+
+       return read_poll_timeout_atomic(airoha_fe_rr, val,
+                                       val & PPE_SRAM_CTRL_ACK_MASK,
+                                       10, 100, false, ppe->eth,
+                                       REG_PPE_RAM_CTRL(ppe2));
+}
+
 static int airoha_ppe_foe_commit_entry(struct airoha_ppe *ppe,
                                       struct airoha_foe_entry *e,
                                       u32 hash, bool rx_wlan)
@@ -685,13 +706,8 @@ static int airoha_ppe_foe_commit_entry(struct airoha_ppe *ppe,
        if (!rx_wlan)
                airoha_ppe_foe_flow_stats_update(ppe, npu, hwe, hash);
 
-       if (hash < sram_num_entries) {
-               dma_addr_t addr = ppe->foe_dma + hash * sizeof(*hwe);
-               bool ppe2 = hash >= PPE_SRAM_NUM_ENTRIES;
-
-               err = npu->ops.ppe_foe_commit_entry(npu, addr, sizeof(*hwe),
-                                                   hash, ppe2);
-       }
+       if (hash < sram_num_entries)
+               err = airoha_ppe_foe_commit_sram_entry(ppe, hash);
 unlock:
        rcu_read_unlock();