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* [PATCH 23.11] net/txgbe: fix FDIR input mask
@ 2026-01-04  2:53 Jiawen Wu
  2026-01-06  9:54 ` Shani Peretz
  0 siblings, 1 reply; 2+ messages in thread
From: Jiawen Wu @ 2026-01-04  2:53 UTC (permalink / raw)
  To: stable; +Cc: Jiawen Wu

[ upstream commit a2d4de27109033d5061da44aed919bf46cfd7ca9 ]

Fix FDIR mask settings to comply with the hardware configuration. And
mask out the spec field instead of manually setting it to 0.

There are some requirements of mask in hardware:
1) IPv4 mask should be little-endian.
2) Ipv6 source address mask has only 16 bits, one bit of mask
   corresponds to one byte of spec.
3) IPv6 dest address is only supported to perfect match the low 8 bits,
   so it is not taken into account for support in the driver.

Fixes: ea230dda16ad ("net/txgbe: configure flow director filter")

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
---
 drivers/net/txgbe/txgbe_fdir.c | 49 +++++++++++++++++++++++++++++-----
 drivers/net/txgbe/txgbe_flow.c |  8 ++----
 2 files changed, 45 insertions(+), 12 deletions(-)

diff --git a/drivers/net/txgbe/txgbe_fdir.c b/drivers/net/txgbe/txgbe_fdir.c
index 8d181db33f..6b83a7379d 100644
--- a/drivers/net/txgbe/txgbe_fdir.c
+++ b/drivers/net/txgbe/txgbe_fdir.c
@@ -165,6 +165,15 @@ configure_fdir_flags(const struct rte_eth_fdir_conf *conf,
 	return 0;
 }
 
+static inline uint16_t
+txgbe_reverse_fdir_bitmasks(uint16_t mask)
+{
+	mask = ((mask & 0x5555) << 1) | ((mask & 0xAAAA) >> 1);
+	mask = ((mask & 0x3333) << 2) | ((mask & 0xCCCC) >> 2);
+	mask = ((mask & 0x0F0F) << 4) | ((mask & 0xF0F0) >> 4);
+	return ((mask & 0x00FF) << 8) | ((mask & 0xFF00) >> 8);
+}
+
 int
 txgbe_fdir_set_input_mask(struct rte_eth_dev *dev)
 {
@@ -206,15 +215,15 @@ txgbe_fdir_set_input_mask(struct rte_eth_dev *dev)
 	wr32(hw, TXGBE_FDIRUDPMSK, ~fdirtcpm);
 	wr32(hw, TXGBE_FDIRSCTPMSK, ~fdirtcpm);
 
-	/* Store source and destination IPv4 masks (big-endian) */
-	wr32(hw, TXGBE_FDIRSIP4MSK, ~info->mask.src_ipv4_mask);
-	wr32(hw, TXGBE_FDIRDIP4MSK, ~info->mask.dst_ipv4_mask);
+	/* Store source and destination IPv4 masks (little-endian) */
+	wr32(hw, TXGBE_FDIRSIP4MSK, rte_be_to_cpu_32(~info->mask.src_ipv4_mask));
+	wr32(hw, TXGBE_FDIRDIP4MSK, rte_be_to_cpu_32(~info->mask.dst_ipv4_mask));
 
 	/*
 	 * Store source and destination IPv6 masks (bit reversed)
 	 */
-	fdiripv6m = TXGBE_FDIRIP6MSK_DST(info->mask.dst_ipv6_mask) |
-		    TXGBE_FDIRIP6MSK_SRC(info->mask.src_ipv6_mask);
+	fdiripv6m = txgbe_reverse_fdir_bitmasks(info->mask.dst_ipv6_mask) << 16;
+	fdiripv6m |= txgbe_reverse_fdir_bitmasks(info->mask.src_ipv6_mask);
 	wr32(hw, TXGBE_FDIRIP6MSK, ~fdiripv6m);
 
 	return 0;
@@ -636,8 +645,14 @@ fdir_write_perfect_filter(struct txgbe_hw *hw,
 	fdircmd |= TXGBE_FDIRPICMD_QP(queue);
 	fdircmd |= TXGBE_FDIRPICMD_POOL(input->vm_pool);
 
-	if (input->flow_type & TXGBE_ATR_L3TYPE_IPV6)
+	if (input->flow_type & TXGBE_ATR_L3TYPE_IPV6) {
+		/* use SIP4 to store LS Dword of the Source iPv6 address */
+		wr32(hw, TXGBE_FDIRPISIP4, be_to_le32(input->src_ip[3]));
+		wr32(hw, TXGBE_FDIRPISIP6(0), be_to_le32(input->src_ip[2]));
+		wr32(hw, TXGBE_FDIRPISIP6(1), be_to_le32(input->src_ip[1]));
+		wr32(hw, TXGBE_FDIRPISIP6(2), be_to_le32(input->src_ip[0]));
 		fdircmd |= TXGBE_FDIRPICMD_IP6;
+	}
 	wr32(hw, TXGBE_FDIRPICMD, fdircmd);
 
 	PMD_DRV_LOG(DEBUG, "Rx Queue=%x hash=%x", queue, fdirhash);
@@ -783,6 +798,26 @@ txgbe_remove_fdir_filter(struct txgbe_hw_fdir_info *fdir_info,
 	return 0;
 }
 
+static void
+txgbe_fdir_mask_input(struct txgbe_hw_fdir_mask *mask,
+		      struct txgbe_atr_input *input)
+{
+	int i;
+
+	if (input->flow_type & TXGBE_ATR_L3TYPE_IPV6) {
+		for (i = 0; i < 16; i++) {
+			if (!(mask->src_ipv6_mask & (1 << i)))
+				input->src_ip[i / 4] &= ~(0xFF << ((i % 4) * 8));
+		}
+	} else {
+		input->src_ip[0] &= mask->src_ipv4_mask;
+		input->dst_ip[0] &= mask->dst_ipv4_mask;
+	}
+
+	input->src_port &= mask->src_port_mask;
+	input->dst_port &= mask->dst_port_mask;
+}
+
 int
 txgbe_fdir_filter_program(struct rte_eth_dev *dev,
 			  struct txgbe_fdir_rule *rule,
@@ -805,6 +840,8 @@ txgbe_fdir_filter_program(struct rte_eth_dev *dev,
 	if (fdir_mode >= RTE_FDIR_MODE_PERFECT)
 		is_perfect = TRUE;
 
+	txgbe_fdir_mask_input(&info->mask, &rule->input);
+
 	if (is_perfect) {
 		fdirhash = atr_compute_perfect_hash(&rule->input,
 				TXGBE_DEV_FDIR_CONF(dev)->pballoc);
diff --git a/drivers/net/txgbe/txgbe_flow.c b/drivers/net/txgbe/txgbe_flow.c
index 8ac29a0351..006e0b9759 100644
--- a/drivers/net/txgbe/txgbe_flow.c
+++ b/drivers/net/txgbe/txgbe_flow.c
@@ -1834,9 +1834,7 @@ txgbe_parse_fdir_filter_normal(struct rte_eth_dev *dev __rte_unused,
 
 			/* check dst addr mask */
 			for (j = 0; j < 16; j++) {
-				if (ipv6_mask->hdr.dst_addr[j] == UINT8_MAX) {
-					rule->mask.dst_ipv6_mask |= 1 << j;
-				} else if (ipv6_mask->hdr.dst_addr[j] != 0) {
+				if (ipv6_mask->hdr.dst_addr[j] != 0) {
 					memset(rule, 0, sizeof(struct txgbe_fdir_rule));
 					rte_flow_error_set(error, EINVAL,
 						RTE_FLOW_ERROR_TYPE_ITEM,
@@ -2597,9 +2595,7 @@ txgbe_parse_fdir_filter_tunnel(const struct rte_flow_attr *attr,
 
 			/* check dst addr mask */
 			for (j = 0; j < 16; j++) {
-				if (ipv6_mask->hdr.dst_addr[j] == UINT8_MAX) {
-					rule->mask.dst_ipv6_mask |= 1 << j;
-				} else if (ipv6_mask->hdr.dst_addr[j] != 0) {
+				if (ipv6_mask->hdr.dst_addr[j] != 0) {
 					memset(rule, 0, sizeof(struct txgbe_fdir_rule));
 					rte_flow_error_set(error, EINVAL,
 							   RTE_FLOW_ERROR_TYPE_ITEM,
-- 
2.48.1


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2026-01-04  2:53 [PATCH 23.11] net/txgbe: fix FDIR input mask Jiawen Wu
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