diff mbox series

[bpf-next,V3,6/6] igc: add XDP hints kfuncs for RX hash

Message ID 167950090270.2796265.5629516764329442733.stgit@firesoul (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series XDP-hints kfuncs for Intel driver igc | expand

Checks

Context Check Description
bpf/vmtest-bpf-next-PR success PR summary
bpf/vmtest-bpf-next-VM_Test-13 success Logs for test_maps on x86_64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-19 success Logs for test_progs_no_alu32 on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-20 success Logs for test_progs_no_alu32 on aarch64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-27 success Logs for test_progs_no_alu32_parallel on x86_64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-1 success Logs for ShellCheck
bpf/vmtest-bpf-next-VM_Test-9 success Logs for set-matrix
bpf/vmtest-bpf-next-VM_Test-2 success Logs for build for aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-6 success Logs for build for x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-8 success Logs for build for x86_64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-3 success Logs for build for aarch64 with llvm-15
bpf/vmtest-bpf-next-VM_Test-4 success Logs for build for aarch64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-7 success Logs for build for x86_64 with llvm-15
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for bpf-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 22 this patch: 22
netdev/cc_maintainers success CCed 13 of 13 maintainers
netdev/build_clang success Errors and warnings before: 18 this patch: 18
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 22 this patch: 22
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 21 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
bpf/vmtest-bpf-next-VM_Test-5 success Logs for build for s390x with gcc
bpf/vmtest-bpf-next-VM_Test-10 success Logs for test_maps on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-11 success Logs for test_maps on aarch64 with llvm-15
bpf/vmtest-bpf-next-VM_Test-12 success Logs for test_maps on aarch64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-14 success Logs for test_maps on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-15 success Logs for test_maps on x86_64 with llvm-15
bpf/vmtest-bpf-next-VM_Test-16 success Logs for test_maps on x86_64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-17 success Logs for test_progs on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-18 success Logs for test_progs on aarch64 with llvm-15
bpf/vmtest-bpf-next-VM_Test-21 success Logs for test_progs on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-22 success Logs for test_progs on x86_64 with llvm-15
bpf/vmtest-bpf-next-VM_Test-23 success Logs for test_progs on x86_64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-24 success Logs for test_progs_no_alu32 on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-25 success Logs for test_progs_no_alu32 on aarch64 with llvm-15
bpf/vmtest-bpf-next-VM_Test-26 success Logs for test_progs_no_alu32 on aarch64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-28 success Logs for test_progs_no_alu32 on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-29 success Logs for test_progs_no_alu32 on x86_64 with llvm-15
bpf/vmtest-bpf-next-VM_Test-30 success Logs for test_progs_no_alu32 on x86_64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-31 success Logs for test_progs_no_alu32_parallel on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-32 success Logs for test_progs_no_alu32_parallel on aarch64 with llvm-15
bpf/vmtest-bpf-next-VM_Test-33 success Logs for test_progs_no_alu32_parallel on aarch64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-34 success Logs for test_progs_no_alu32_parallel on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-35 success Logs for test_progs_no_alu32_parallel on x86_64 with llvm-15
bpf/vmtest-bpf-next-VM_Test-36 success Logs for test_progs_no_alu32_parallel on x86_64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-37 success Logs for test_progs_parallel on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-38 success Logs for test_progs_parallel on aarch64 with llvm-15
bpf/vmtest-bpf-next-VM_Test-39 success Logs for test_progs_parallel on aarch64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-40 success Logs for test_progs_parallel on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-41 success Logs for test_progs_parallel on x86_64 with llvm-15
bpf/vmtest-bpf-next-VM_Test-42 success Logs for test_progs_parallel on x86_64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-43 success Logs for test_verifier on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-44 success Logs for test_verifier on aarch64 with llvm-15
bpf/vmtest-bpf-next-VM_Test-45 success Logs for test_verifier on aarch64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-46 success Logs for test_verifier on s390x with gcc
bpf/vmtest-bpf-next-VM_Test-47 success Logs for test_verifier on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-48 success Logs for test_verifier on x86_64 with llvm-15
bpf/vmtest-bpf-next-VM_Test-49 success Logs for test_verifier on x86_64 with llvm-16

Commit Message

Jesper Dangaard Brouer March 22, 2023, 4:01 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,
 };
 
 /**