[PATCH net-next] cxgb4: update LE-TCAM collection for T6

[Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>]

For T6, clip table is separated from main TCAM. So, update LE-TCAM
collection logic to collect clip table TCAM as well. IPv6 takes
4 entries in clip table TCAM compared to 2 entries in main TCAM.

Also, in case of errors, keep LE-TCAM collected so far and set the
status to partial dump.

Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
---
 drivers/net/ethernet/chelsio/cxgb4/cudbg_entity.h |  3 ++
 drivers/net/ethernet/chelsio/cxgb4/cudbg_if.h     |  1 +
 drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c    | 40 ++++++++++++++++++-----
 drivers/net/ethernet/chelsio/cxgb4/t4_regs.h      |  1 +
 4 files changed, 37 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cudbg_entity.h b/drivers/net/ethernet/chelsio/cxgb4/cudbg_entity.h
index b57acb8dc35b..740a18ba4229 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cudbg_entity.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/cudbg_entity.h
@@ -235,6 +235,9 @@ struct cudbg_vpd_data {
 };
 
 #define CUDBG_MAX_TCAM_TID 0x800
+#define CUDBG_T6_CLIP 1536
+#define CUDBG_MAX_TID_COMP_EN 6144
+#define CUDBG_MAX_TID_COMP_DIS 3072
 
 enum cudbg_le_entry_types {
 	LE_ET_UNKNOWN = 0,
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cudbg_if.h b/drivers/net/ethernet/chelsio/cxgb4/cudbg_if.h
index 8568a51f6414..215fe6260fd7 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cudbg_if.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/cudbg_if.h
@@ -24,6 +24,7 @@
 #define CUDBG_STATUS_NOT_IMPLEMENTED -28
 #define CUDBG_SYSTEM_ERROR -29
 #define CUDBG_STATUS_CCLK_NOT_DEFINED -32
+#define CUDBG_STATUS_PARTIAL_DATA -41
 
 #define CUDBG_MAJOR_VERSION 1
 #define CUDBG_MINOR_VERSION 14
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c b/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c
index 9da6f57901a9..4feb7eca0acf 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c
@@ -2366,8 +2366,11 @@ void cudbg_fill_le_tcam_info(struct adapter *padap,
 	value = t4_read_reg(padap, LE_DB_ROUTING_TABLE_INDEX_A);
 	tcam_region->routing_start = value;
 
-	/*Get clip table index */
-	value = t4_read_reg(padap, LE_DB_CLIP_TABLE_INDEX_A);
+	/* Get clip table index. For T6 there is separate CLIP TCAM */
+	if (is_t6(padap->params.chip))
+		value = t4_read_reg(padap, LE_DB_CLCAM_TID_BASE_A);
+	else
+		value = t4_read_reg(padap, LE_DB_CLIP_TABLE_INDEX_A);
 	tcam_region->clip_start = value;
 
 	/* Get filter table index */
@@ -2392,8 +2395,16 @@ void cudbg_fill_le_tcam_info(struct adapter *padap,
 					       tcam_region->tid_hash_base;
 		}
 	} else { /* hash not enabled */
-		tcam_region->max_tid = CUDBG_MAX_TCAM_TID;
+		if (is_t6(padap->params.chip))
+			tcam_region->max_tid = (value & ASLIPCOMPEN_F) ?
+					       CUDBG_MAX_TID_COMP_EN :
+					       CUDBG_MAX_TID_COMP_DIS;
+		else
+			tcam_region->max_tid = CUDBG_MAX_TCAM_TID;
 	}
+
+	if (is_t6(padap->params.chip))
+		tcam_region->max_tid += CUDBG_T6_CLIP;
 }
 
 int cudbg_collect_le_tcam(struct cudbg_init *pdbg_init,
@@ -2423,18 +2434,31 @@ int cudbg_collect_le_tcam(struct cudbg_init *pdbg_init,
 	for (i = 0; i < tcam_region.max_tid; ) {
 		rc = cudbg_read_tid(pdbg_init, i, tid_data);
 		if (rc) {
-			cudbg_err->sys_err = rc;
-			cudbg_put_buff(pdbg_init, &temp_buff);
-			return rc;
+			cudbg_err->sys_warn = CUDBG_STATUS_PARTIAL_DATA;
+			/* Update tcam header and exit */
+			tcam_region.max_tid = i;
+			memcpy(temp_buff.data, &tcam_region,
+			       sizeof(struct cudbg_tcam));
+			goto out;
 		}
 
-		/* ipv6 takes two tids */
-		cudbg_is_ipv6_entry(tid_data, tcam_region) ? i += 2 : i++;
+		if (cudbg_is_ipv6_entry(tid_data, tcam_region)) {
+			/* T6 CLIP TCAM: ipv6 takes 4 entries */
+			if (is_t6(padap->params.chip) &&
+			    i >= tcam_region.clip_start &&
+			    i < tcam_region.clip_start + CUDBG_T6_CLIP)
+				i += 4;
+			else /* Main TCAM: ipv6 takes two tids */
+				i += 2;
+		} else {
+			i++;
+		}
 
 		tid_data++;
 		bytes += sizeof(struct cudbg_tid_data);
 	}
 
+out:
 	return cudbg_write_and_release_buff(pdbg_init, &temp_buff, dbg_buff);
 }
 
diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h b/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h
index 843f8cada1de..6b55aa2eb2a5 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h
@@ -2999,6 +2999,7 @@
 #define LE_DB_HASH_TID_BASE_A 0x19c30
 #define LE_DB_HASH_TBL_BASE_ADDR_A 0x19c30
 #define LE_DB_INT_CAUSE_A 0x19c3c
+#define LE_DB_CLCAM_TID_BASE_A 0x19df4
 #define LE_DB_TID_HASHBASE_A 0x19df8
 #define T6_LE_DB_HASH_TID_BASE_A 0x19df8
 
-- 
2.14.1