[PATCH net-next 2/4] bnxt_en: Implement XDP RSS hash metadata extraction
From: Chris J Arges
Date: Fri Feb 27 2026 - 12:45:55 EST
Add support for extracting RSS hash values and hash types from hardware
completion descriptors in XDP programs for bnxt_en.
Add IP_TYPE definition for determining if completion is ipv4 or ipv6. In
addition add ITYPE_ICMP flag for identifying ICMP completions.
Signed-off-by: Chris J Arges <carges@xxxxxxxxxxxxxx>
---
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 5 ++
drivers/net/ethernet/broadcom/bnxt/bnxt.h | 2 +
drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c | 47 +++++++++++++++++++
drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h | 3 ++
4 files changed, 57 insertions(+)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index a80ec5391b89..a8ea73c880e9 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -15905,6 +15905,10 @@ static const struct net_device_ops bnxt_netdev_ops = {
.ndo_hwtstamp_set = bnxt_hwtstamp_set,
};
+static const struct xdp_metadata_ops bnxt_xdp_metadata_ops = {
+ .xmo_rx_hash = bnxt_xdp_rx_hash,
+};
+
static void bnxt_get_queue_stats_rx(struct net_device *dev, int i,
struct netdev_queue_stats_rx *stats)
{
@@ -16789,6 +16793,7 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
goto init_err_free;
dev->netdev_ops = &bnxt_netdev_ops;
+ dev->xdp_metadata_ops = &bnxt_xdp_metadata_ops;
dev->stat_ops = &bnxt_stat_ops;
dev->watchdog_timeo = BNXT_TX_TIMEOUT;
dev->ethtool_ops = &bnxt_ethtool_ops;
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 9a41b9e0423c..13eb1ca814b7 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -232,6 +232,7 @@ struct rx_cmp {
#define RX_CMP_FLAGS_ITYPE_UDP (3 << 12)
#define RX_CMP_FLAGS_ITYPE_FCOE (4 << 12)
#define RX_CMP_FLAGS_ITYPE_ROCE (5 << 12)
+ #define RX_CMP_FLAGS_ITYPE_ICMP (7 << 12)
#define RX_CMP_FLAGS_ITYPE_PTP_WO_TS (8 << 12)
#define RX_CMP_FLAGS_ITYPE_PTP_W_TS (9 << 12)
#define RX_CMP_LEN (0xffff << 16)
@@ -311,6 +312,7 @@ struct rx_cmp_ext {
#define RX_CMP_FLAGS2_T_IP_CS_CALC (0x1 << 2)
#define RX_CMP_FLAGS2_T_L4_CS_CALC (0x1 << 3)
#define RX_CMP_FLAGS2_META_FORMAT_VLAN (0x1 << 4)
+ #define RX_CMP_FLAGS2_IP_TYPE (0x1 << 8)
__le32 rx_cmp_meta_data;
#define RX_CMP_FLAGS2_METADATA_TCI_MASK 0xffff
#define RX_CMP_FLAGS2_METADATA_VID_MASK 0xfff
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
index 85cbeb35681c..f75060374163 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
@@ -472,3 +472,50 @@ bnxt_xdp_build_skb(struct bnxt *bp, struct sk_buff *skb, u8 num_frags,
xdp_buff_get_skb_flags(xdp));
return skb;
}
+
+int bnxt_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash,
+ enum xdp_rss_hash_type *rss_type)
+{
+ const struct bnxt_xdp_buff *xdp = (void *)ctx;
+ const struct rx_cmp *rxcmp = xdp->rxcmp;
+ const struct rx_cmp_ext *rxcmp1 = xdp->rxcmp1;
+ u32 itypes;
+ enum xdp_rss_hash_type hash_type = 0;
+
+ if (!rxcmp || !RX_CMP_HASH_VALID(rxcmp))
+ return -ENODATA;
+
+ *hash = le32_to_cpu(rxcmp->rx_cmp_rss_hash);
+
+ if (!rxcmp1) {
+ *rss_type = XDP_RSS_TYPE_L2;
+ return 0;
+ }
+
+ if (xdp->cmp_type == CMP_TYPE_RX_L2_CMP) {
+ itypes = RX_CMP_ITYPES(rxcmp);
+ if (rxcmp1->rx_cmp_flags2 &
+ cpu_to_le32(RX_CMP_FLAGS2_IP_TYPE)) {
+ hash_type |= XDP_RSS_TYPE_L3_IPV6;
+ } else {
+ hash_type |= XDP_RSS_TYPE_L3_IPV4;
+ }
+
+ switch (itypes) {
+ case RX_CMP_FLAGS_ITYPE_TCP:
+ hash_type |= XDP_RSS_L4 | XDP_RSS_L4_TCP;
+ break;
+ case RX_CMP_FLAGS_ITYPE_UDP:
+ hash_type |= XDP_RSS_L4 | XDP_RSS_L4_UDP;
+ break;
+ case RX_CMP_FLAGS_ITYPE_ICMP:
+ hash_type |= XDP_RSS_L4 | XDP_RSS_L4_ICMP;
+ break;
+ default:
+ break;
+ }
+ }
+
+ *rss_type = hash_type;
+ return 0;
+}
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h
index 8c66698bde11..fb4f9143929f 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h
@@ -41,4 +41,7 @@ void bnxt_xdp_buff_frags_free(struct bnxt_rx_ring_info *rxr,
struct sk_buff *bnxt_xdp_build_skb(struct bnxt *bp, struct sk_buff *skb,
u8 num_frags, struct bnxt_rx_ring_info *rxr,
struct xdp_buff *xdp);
+int bnxt_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash,
+ enum xdp_rss_hash_type *rss_type);
+
#endif
--
2.43.0