[dpdk-dev] [PATCH v4 2/2] lib/librte_pmd_i40e: add I40E_VFTA_IDX and I40E_VFTA__BIT macros for VFTA related operation

[Huawei Xie <huawei.xie@intel.com>]

Add two macros I40E_VFTA_IDX and I40E_VFTA_BIT for vlan filter search and set.
Add vlan_id check in vlan filter search and set function.

Signed-off-by: Huawei Xie <huawei.xie@intel.com>
---
 lib/librte_pmd_i40e/i40e_ethdev.c | 17 ++++++++++-------
 lib/librte_pmd_i40e/i40e_ethdev.h |  9 +++++++++
 2 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/lib/librte_pmd_i40e/i40e_ethdev.c b/lib/librte_pmd_i40e/i40e_ethdev.c
index 518597f..43b9448 100644
--- a/lib/librte_pmd_i40e/i40e_ethdev.c
+++ b/lib/librte_pmd_i40e/i40e_ethdev.c
@@ -4157,8 +4157,11 @@ i40e_find_vlan_filter(struct i40e_vsi *vsi,
 {
 	uint32_t vid_idx, vid_bit;
 
-	vid_idx = (uint32_t) ((vlan_id >> 5) & 0x7F);
-	vid_bit = (uint32_t) (1 << (vlan_id & 0x1F));
+	if (vlan_id > ETH_VLAN_ID_MAX)
+		return 0;
+
+	vid_idx = I40E_VFTA_IDX(vlan_id);
+	vid_bit = I40E_VFTA_BIT(vlan_id);
 
 	if (vsi->vfta[vid_idx] & vid_bit)
 		return 1;
@@ -4172,11 +4175,11 @@ i40e_set_vlan_filter(struct i40e_vsi *vsi,
 {
 	uint32_t vid_idx, vid_bit;
 
-	/* VFTA is 32-bits size array, each element contains 32 vlan bits, Find the
-	 *  element first, then find the bits it belongs to
-	 */
-	vid_idx = (uint32_t) ((vlan_id >> 5) & 0x7F);
-	vid_bit = (uint32_t) (1 << (vlan_id & 0x1F));
+	if (vlan_id > ETH_VLAN_ID_MAX)
+		return;
+
+	vid_idx = I40E_VFTA_IDX(vlan_id);
+	vid_bit = I40E_VFTA_BIT(vlan_id);
 
 	if (on)
 		vsi->vfta[vid_idx] |= vid_bit;
diff --git a/lib/librte_pmd_i40e/i40e_ethdev.h b/lib/librte_pmd_i40e/i40e_ethdev.h
index f99fbea..f913ea9 100644
--- a/lib/librte_pmd_i40e/i40e_ethdev.h
+++ b/lib/librte_pmd_i40e/i40e_ethdev.h
@@ -50,6 +50,15 @@
 #define I40E_DEFAULT_QP_NUM_FDIR  1
 #define I40E_UINT32_BIT_SIZE      (CHAR_BIT * sizeof(uint32_t))
 #define I40E_VFTA_SIZE            (4096 / I40E_UINT32_BIT_SIZE)
+/*
+ * vlan_id is a 12 bit number.
+ * The VFTA array is actually a 4096 bit array, 128 of 32bit elements.
+ * 2^5 = 32. The val of lower 5 bits specifies the bit in the 32bit element.
+ * The higher 7 bit val specifies VFTA array index.
+ */
+#define I40E_VFTA_BIT(vlan_id)    (1 << ((vlan_id) & 0x1F))
+#define I40E_VFTA_IDX(vlan_id)    ((vlan_id) >> 5)
+
 /* Default TC traffic in case DCB is not enabled */
 #define I40E_DEFAULT_TCMAP        0x1
 #define I40E_FDIR_QUEUE_ID        0
-- 
1.8.1.4