[RFC bpf-next 10/23] ice: Implement VLAN tag hint

Larysa Zaremba
2023-08-24T19:34:18Z

Implement .xmo_rx_vlan_tag callback to allow XDP code to read
packet's VLAN tag.

At the same time, use vlan_tci instead of vlan_tag in touched code,
because vlan_tag is misleading.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
drivers/net/ethernet/intel/ice/ice_main.c | 22 ++++++++++++++++
drivers/net/ethernet/intel/ice/ice_txrx.c | 6 ++---
drivers/net/ethernet/intel/ice/ice_txrx.h | 1 +
drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 26 +++++++++++++++++++
drivers/net/ethernet/intel/ice/ice_txrx_lib.h | 4 +--
drivers/net/ethernet/intel/ice/ice_xsk.c | 6 ++---
6 files changed, 57 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 557c6326ff87..aff4fa1a75f8 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -6007,6 +6007,23 @@ ice_fix_features(struct net_device *netdev, netdev_features_t features)
return features;
}

+/**
+ * ice_set_rx_rings_vlan_proto - update rings with new stripped VLAN proto
+ * @vsi: PF's VSI
+ * @vlan_ethertype: VLAN ethertype (802.1Q or 802.1ad) in network byte order
+ *
+ * Store current stripped VLAN proto in ring packet context,
+ * so it can be accessed more efficiently by packet processing code.
+ */
+static void
+ice_set_rx_rings_vlan_proto(struct ice_vsi *vsi, __be16 vlan_ethertype)
+{
+ u16 i;
+
+ ice_for_each_alloc_rxq(vsi, i)
+ vsi->rx_rings[i]->pkt_ctx.vlan_proto = vlan_ethertype;
+}
+
/**
* ice_set_vlan_offload_features - set VLAN offload features for the PF VSI
* @vsi: PF's VSI
@@ -6049,6 +6066,11 @@ ice_set_vlan_offload_features(struct ice_vsi *vsi, netdev_features_t features)
if (strip_err || insert_err)
return -EIO;

+ if (enable_stripping)
+ ice_set_rx_rings_vlan_proto(vsi, htons(vlan_ethertype));
+ else
+ ice_set_rx_rings_vlan_proto(vsi, 0);
+
return 0;
}

diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
index 4e6546d9cf85..4fd7614f243d 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
@@ -1183,7 +1183,7 @@ int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget)
struct sk_buff *skb;
unsigned int size;
u16 stat_err_bits;
- u16 vlan_tag = 0;
+ u16 vlan_tci;

/* get the Rx desc from Rx ring based on 'next_to_clean' */
rx_desc = ICE_RX_DESC(rx_ring, ntc);
@@ -1278,7 +1278,7 @@ int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget)
continue;
}

- vlan_tag = ice_get_vlan_tag_from_rx_desc(rx_desc);
+ vlan_tci = ice_get_vlan_tci(rx_desc);

/* pad the skb if needed, to make a valid ethernet frame */
if (eth_skb_pad(skb))
@@ -1292,7 +1292,7 @@ int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget)

ice_trace(clean_rx_irq_indicate, rx_ring, rx_desc, skb);
/* send completed skb up the stack */
- ice_receive_skb(rx_ring, skb, vlan_tag);
+ ice_receive_skb(rx_ring, skb, vlan_tci);

/* update budget accounting */
total_rx_pkts++;
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.h b/drivers/net/ethernet/intel/ice/ice_txrx.h
index 4237702a58a9..41e0b14e6643 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.h
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.h
@@ -260,6 +260,7 @@ enum ice_rx_dtype {
struct ice_pkt_ctx {
const union ice_32b_rx_flex_desc *eop_desc;
u64 cached_phctime;
+ __be16 vlan_proto;
};

struct ice_xdp_buff {
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
index b11cfaedb81c..10e7ec51f4ef 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -639,7 +639,33 @@ static int ice_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash,
return 0;
}

+/**
+ * ice_xdp_rx_vlan_tag - VLAN tag XDP hint handler
+ * @ctx: XDP buff pointer
+ * @vlan_tci: destination address for VLAN tag
+ * @vlan_proto: destination address for VLAN protocol
+ *
+ * Copy VLAN tag (if was stripped) and corresponding protocol
+ * to the destination address.
+ */
+static int ice_xdp_rx_vlan_tag(const struct xdp_md *ctx, u16 *vlan_tci,
+ __be16 *vlan_proto)
+{
+ const struct ice_xdp_buff *xdp_ext = (void *)ctx;
+
+ *vlan_proto = xdp_ext->pkt_ctx.vlan_proto;
+ if (!*vlan_proto)
+ return -ENODATA;
+
+ *vlan_tci = ice_get_vlan_tci(xdp_ext->pkt_ctx.eop_desc);
+ if (!*vlan_tci)
+ return -ENODATA;
+
+ return 0;
+}
+
const struct xdp_metadata_ops ice_xdp_md_ops = {
.xmo_rx_timestamp = ice_xdp_rx_hw_ts,
.xmo_rx_hash = ice_xdp_rx_hash,
+ .xmo_rx_vlan_tag = ice_xdp_rx_vlan_tag,
};
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.h b/drivers/net/ethernet/intel/ice/ice_txrx_lib.h
index 145883eec129..b7205826fea8 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.h
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.h
@@ -84,7 +84,7 @@ ice_build_ctob(u64 td_cmd, u64 td_offset, unsigned int size, u64 td_tag)
}

/**
- * ice_get_vlan_tag_from_rx_desc - get VLAN from Rx flex descriptor
+ * ice_get_vlan_tci - get VLAN TCI from Rx flex descriptor
* @rx_desc: Rx 32b flex descriptor with RXDID=2
*
* The OS and current PF implementation only support stripping a single VLAN tag
@@ -92,7 +92,7 @@ ice_build_ctob(u64 td_cmd, u64 td_offset, unsigned int size, u64 td_tag)
* one is found return the tag, else return 0 to mean no VLAN tag was found.
*/
static inline u16
-ice_get_vlan_tag_from_rx_desc(union ice_32b_rx_flex_desc *rx_desc)
+ice_get_vlan_tci(const union ice_32b_rx_flex_desc *rx_desc)
{
u16 stat_err_bits;

diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
index fdeddad9b639..eeb02f76b4a6 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -878,7 +878,7 @@ int ice_clean_rx_irq_zc(struct ice_rx_ring *rx_ring, int budget)
struct xdp_buff *xdp;
struct sk_buff *skb;
u16 stat_err_bits;
- u16 vlan_tag = 0;
+ u16 vlan_tci;

rx_desc = ICE_RX_DESC(rx_ring, ntc);

@@ -957,10 +957,10 @@ int ice_clean_rx_irq_zc(struct ice_rx_ring *rx_ring, int budget)
total_rx_bytes += skb->len;
total_rx_packets++;

- vlan_tag = ice_get_vlan_tag_from_rx_desc(rx_desc);
+ vlan_tci = ice_get_vlan_tci(rx_desc);

ice_process_skb_fields(rx_ring, rx_desc, skb);
- ice_receive_skb(rx_ring, skb, vlan_tag);
+ ice_receive_skb(rx_ring, skb, vlan_tci);
}

rx_ring->next_to_clean = ntc;
--
2.41.0