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[bpf-next,V1,7/7] igc: add XDP hints kfuncs for RX hash

Message ID 167906362611.2706833.3815510480830561339.stgit@firesoul (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series XDP-hints kfuncs for Intel driver igc | expand

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netdev/build_32bit success Errors and warnings before: 22 this patch: 22
netdev/cc_maintainers warning 8 maintainers not CCed: intel-wired-lan@lists.osuosl.org pabeni@redhat.com jesse.brandeburg@intel.com kuba@kernel.org edumazet@google.com john.fastabend@gmail.com hawk@kernel.org davem@davemloft.net
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Commit Message

Jesper Dangaard Brouer March 17, 2023, 2:33 p.m. UTC 
This implements XDP hints kfunc for RX-hash (xmo_rx_hash) straightforward
by returning the u32 hash value.

The associated RSS-type for the hash value isn't available to the BPF-prog
caller. This is problematic if BPF-prog tries to do L4 load-balancing with
the hardware hash, but the RSS hash type is L3 based.

For this driver this issue occurs for UDP packets, as driver (default
config) does L3 hashing for UDP packets (excludes UDP src/dest ports in
hash calc). Tested that the igc_rss_type_num for UDP is either
IGC_RSS_TYPE_HASH_IPV4 or IGC_RSS_TYPE_HASH_IPV6.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
---
 drivers/net/ethernet/intel/igc/igc_main.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index f66285c85444..846041119fd4 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -6496,8 +6496,21 @@  static int igc_xdp_rx_timestamp(const struct xdp_md *_ctx, u64 *timestamp)
 	return -ENODATA;
 }
 
+static int igc_xdp_rx_hash(const struct xdp_md *_ctx, u32 *hash)
+{
+	const struct igc_xdp_buff *ctx = (void *)_ctx;
+
+	if (!(ctx->xdp.rxq->dev->features & NETIF_F_RXHASH))
+		return -ENODATA;
+
+	*hash = le32_to_cpu(ctx->rx_desc->wb.lower.hi_dword.rss);
+
+	return 0;
+}
+
 const struct xdp_metadata_ops igc_xdp_metadata_ops = {
 	.xmo_rx_timestamp		= igc_xdp_rx_timestamp,
+	.xmo_rx_hash			= igc_xdp_rx_hash,
 };
 
 /**