cxgb4: Differentiates between TIDs being used in TCAM and HASH

For the tid info, differentiate from which region the TID is allocated
from. It can be from TCAM region or HASH region.
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c

@@ -1654,20 +1654,25 @@ static void process_tid_release_list(struct work_struct *work)
  */
 void cxgb4_remove_tid(struct tid_info *t, unsigned int chan, unsigned int tid)
 {
-	void *old;
 	struct sk_buff *skb;
 	struct adapter *adap = container_of(t, struct adapter, tids);
 
-	old = t->tid_tab[tid];
+	WARN_ON(tid >= t->ntids);
+
+	if (t->tid_tab[tid]) {
+		t->tid_tab[tid] = NULL;
+		if (t->hash_base && (tid >= t->hash_base))
+			atomic_dec(&t->hash_tids_in_use);
+		else
+			atomic_dec(&t->tids_in_use);
+	}
+
 	skb = alloc_skb(sizeof(struct cpl_tid_release), GFP_ATOMIC);
 	if (likely(skb)) {
-		t->tid_tab[tid] = NULL;
 		mk_tid_release(skb, chan, tid);
 		t4_ofld_send(adap, skb);
 	} else
 		cxgb4_queue_tid_release(t, chan, tid);
-	if (old)
-		atomic_dec(&t->tids_in_use);
 }
 EXPORT_SYMBOL(cxgb4_remove_tid);
 
@@ -1705,6 +1710,7 @@ static int tid_init(struct tid_info *t)
 	t->afree = NULL;
 	t->atids_in_use = 0;
 	atomic_set(&t->tids_in_use, 0);
+	atomic_set(&t->hash_tids_in_use, 0);
 
 	/* Setup the free list for atid_tab and clear the stid bitmap. */
 	if (natids) {
@@ -4814,6 +4820,22 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 		adapter->params.offload = 0;
 	}
 
+	if (is_offload(adapter)) {
+		if (t4_read_reg(adapter, LE_DB_CONFIG_A) & HASHEN_F) {
+			u32 hash_base, hash_reg;
+
+			if (chip <= CHELSIO_T5) {
+				hash_reg = LE_DB_TID_HASHBASE_A;
+				hash_base = t4_read_reg(adapter, hash_reg);
+				adapter->tids.hash_base = hash_base / 4;
+			} else {
+				hash_reg = T6_LE_DB_HASH_TID_BASE_A;
+				hash_base = t4_read_reg(adapter, hash_reg);
+				adapter->tids.hash_base = hash_base;
+			}
+		}
+	}
+
 	/* See what interrupts we'll be using */
 	if (msi > 1 && enable_msix(adapter) == 0)
 		adapter->flags |= USING_MSIX;

drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.h

@@ -96,6 +96,7 @@ struct tid_info {
 	unsigned long *stid_bmap;
 	unsigned int nstids;
 	unsigned int stid_base;
+	unsigned int hash_base;
 
 	union aopen_entry *atid_tab;
 	unsigned int natids;
@@ -117,7 +118,10 @@ struct tid_info {
 	spinlock_t stid_lock;
 	unsigned int stids_in_use;
 
+	/* TIDs in the TCAM */
 	atomic_t tids_in_use;
+	/* TIDs in the HASH */
+	atomic_t hash_tids_in_use;
 };
 
 static inline void *lookup_tid(const struct tid_info *t, unsigned int tid)
@@ -147,7 +151,10 @@ static inline void cxgb4_insert_tid(struct tid_info *t, void *data,
 				    unsigned int tid)
 {
 	t->tid_tab[tid] = data;
-	atomic_inc(&t->tids_in_use);
+	if (t->hash_base && (tid >= t->hash_base))
+		atomic_inc(&t->hash_tids_in_use);
+	else
+		atomic_inc(&t->tids_in_use);
 }
 
 int cxgb4_alloc_atid(struct tid_info *t, void *data);

drivers/net/ethernet/chelsio/cxgb4/t4_regs.h

@@ -2736,6 +2736,7 @@
 #define LE_DB_HASH_TBL_BASE_ADDR_A 0x19c30
 #define LE_DB_INT_CAUSE_A 0x19c3c
 #define LE_DB_TID_HASHBASE_A 0x19df8
+#define T6_LE_DB_HASH_TID_BASE_A 0x19df8
 
 #define HASHEN_S    20
 #define HASHEN_V(x) ((x) << HASHEN_S)