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From: Stanislav Fomichev <sdf@google.com>
To: bpf@vger.kernel.org
Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
	martin.lau@linux.dev, song@kernel.org, yhs@fb.com,
	john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com,
	haoluo@google.com, jolsa@kernel.org, kuba@kernel.org,
	toke@kernel.org, willemb@google.com, dsahern@kernel.org,
	magnus.karlsson@intel.com, bjorn@kernel.org,
	maciej.fijalkowski@intel.com, hawk@kernel.org,
	yoong.siang.song@intel.com, netdev@vger.kernel.org,
	xdp-hints@xdp-project.net
Subject: [xdp-hints] [PATCH bpf-next v3 08/10] selftests/bpf: Add TX side to xdp_metadata
Date: Tue,  3 Oct 2023 13:05:20 -0700	[thread overview]
Message-ID: <20231003200522.1914523-9-sdf@google.com> (raw)
In-Reply-To: <20231003200522.1914523-1-sdf@google.com>

Request TX timestamp and make sure it's not empty.
Request TX checksum offload (SW-only) and make sure it's resolved
to the correct one.

Signed-off-by: Stanislav Fomichev <sdf@google.com>
---
 .../selftests/bpf/prog_tests/xdp_metadata.c   | 31 +++++++++++++++++--
 1 file changed, 28 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
index 626c461fa34d..f0da8fe93276 100644
--- a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
@@ -57,6 +57,7 @@ static int open_xsk(int ifindex, struct xsk *xsk)
 		.comp_size = XSK_RING_CONS__DEFAULT_NUM_DESCS,
 		.frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE,
 		.flags = XDP_UMEM_UNALIGNED_CHUNK_FLAG,
+		.tx_metadata_len = sizeof(struct xsk_tx_metadata),
 	};
 	__u32 idx;
 	u64 addr;
@@ -138,6 +139,7 @@ static void ip_csum(struct iphdr *iph)
 
 static int generate_packet(struct xsk *xsk, __u16 dst_port)
 {
+	struct xsk_tx_metadata *meta;
 	struct xdp_desc *tx_desc;
 	struct udphdr *udph;
 	struct ethhdr *eth;
@@ -151,10 +153,14 @@ static int generate_packet(struct xsk *xsk, __u16 dst_port)
 		return -1;
 
 	tx_desc = xsk_ring_prod__tx_desc(&xsk->tx, idx);
-	tx_desc->addr = idx % (UMEM_NUM / 2) * UMEM_FRAME_SIZE;
+	tx_desc->addr = idx % (UMEM_NUM / 2) * UMEM_FRAME_SIZE + sizeof(struct xsk_tx_metadata);
 	printf("%p: tx_desc[%u]->addr=%llx\n", xsk, idx, tx_desc->addr);
 	data = xsk_umem__get_data(xsk->umem_area, tx_desc->addr);
 
+	meta = data - sizeof(struct xsk_tx_metadata);
+	memset(meta, 0, sizeof(*meta));
+	meta->flags = XDP_TX_METADATA_TIMESTAMP;
+
 	eth = data;
 	iph = (void *)(eth + 1);
 	udph = (void *)(iph + 1);
@@ -178,11 +184,17 @@ static int generate_packet(struct xsk *xsk, __u16 dst_port)
 	udph->source = htons(AF_XDP_SOURCE_PORT);
 	udph->dest = htons(dst_port);
 	udph->len = htons(sizeof(*udph) + UDP_PAYLOAD_BYTES);
-	udph->check = 0;
+	udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
+					 ntohs(udph->len), IPPROTO_UDP, 0);
 
 	memset(udph + 1, 0xAA, UDP_PAYLOAD_BYTES);
 
+	meta->flags |= XDP_TX_METADATA_CHECKSUM | XDP_TX_METADATA_CHECKSUM_SW;
+	meta->csum_start = sizeof(*eth) + sizeof(*iph);
+	meta->csum_offset = offsetof(struct udphdr, check);
+
 	tx_desc->len = sizeof(*eth) + sizeof(*iph) + sizeof(*udph) + UDP_PAYLOAD_BYTES;
+	tx_desc->options |= XDP_TX_METADATA;
 	xsk_ring_prod__submit(&xsk->tx, 1);
 
 	ret = sendto(xsk_socket__fd(xsk->socket), NULL, 0, MSG_DONTWAIT, NULL, 0);
@@ -194,13 +206,21 @@ static int generate_packet(struct xsk *xsk, __u16 dst_port)
 
 static void complete_tx(struct xsk *xsk)
 {
-	__u32 idx;
+	struct xsk_tx_metadata *meta;
 	__u64 addr;
+	void *data;
+	__u32 idx;
 
 	if (ASSERT_EQ(xsk_ring_cons__peek(&xsk->comp, 1, &idx), 1, "xsk_ring_cons__peek")) {
 		addr = *xsk_ring_cons__comp_addr(&xsk->comp, idx);
 
 		printf("%p: complete tx idx=%u addr=%llx\n", xsk, idx, addr);
+
+		data = xsk_umem__get_data(xsk->umem_area, addr);
+		meta = data - sizeof(struct xsk_tx_metadata);
+
+		ASSERT_NEQ(meta->completion.tx_timestamp, 0, "tx_timestamp");
+
 		xsk_ring_cons__release(&xsk->comp, 1);
 	}
 }
@@ -221,6 +241,7 @@ static int verify_xsk_metadata(struct xsk *xsk)
 	const struct xdp_desc *rx_desc;
 	struct pollfd fds = {};
 	struct xdp_meta *meta;
+	struct udphdr *udph;
 	struct ethhdr *eth;
 	struct iphdr *iph;
 	__u64 comp_addr;
@@ -257,6 +278,7 @@ static int verify_xsk_metadata(struct xsk *xsk)
 	ASSERT_EQ(eth->h_proto, htons(ETH_P_IP), "eth->h_proto");
 	iph = (void *)(eth + 1);
 	ASSERT_EQ((int)iph->version, 4, "iph->version");
+	udph = (void *)(iph + 1);
 
 	/* custom metadata */
 
@@ -270,6 +292,9 @@ static int verify_xsk_metadata(struct xsk *xsk)
 
 	ASSERT_EQ(meta->rx_hash_type, 0, "rx_hash_type");
 
+	/* checksum offload */
+	ASSERT_EQ(udph->check, 0x1c72, "csum");
+
 	xsk_ring_cons__release(&xsk->rx, 1);
 	refill_rx(xsk, comp_addr);
 
-- 
2.42.0.582.g8ccd20d70d-goog


  parent reply	other threads:[~2023-10-03 20:05 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-10-03 20:05 [xdp-hints] [PATCH bpf-next v3 00/10] xsk: TX metadata Stanislav Fomichev
2023-10-03 20:05 ` [xdp-hints] [PATCH bpf-next v3 01/10] xsk: Support tx_metadata_len Stanislav Fomichev
2023-10-03 20:05 ` [xdp-hints] [PATCH bpf-next v3 02/10] xsk: add TX timestamp and TX checksum offload support Stanislav Fomichev
2023-10-04  6:18   ` [xdp-hints] " Song, Yoong Siang
2023-10-04 17:48     ` Stanislav Fomichev
2023-10-04 17:56       ` Stanislav Fomichev
2023-10-05  1:16         ` Song, Yoong Siang
2023-10-03 20:05 ` [xdp-hints] [PATCH bpf-next v3 03/10] tools: ynl: print xsk-features from the sample Stanislav Fomichev
2023-10-03 20:05 ` [xdp-hints] [PATCH bpf-next v3 04/10] net/mlx5e: Implement AF_XDP TX timestamp and checksum offload Stanislav Fomichev
2023-10-04 23:47   ` [xdp-hints] " kernel test robot
2023-10-03 20:05 ` [xdp-hints] [PATCH bpf-next v3 05/10] net: stmmac: Add Tx HWTS support to XDP ZC Stanislav Fomichev
2023-10-04 23:05   ` [xdp-hints] " kernel test robot
2023-10-04 23:14     ` Stanislav Fomichev
2023-10-06  4:38   ` kernel test robot
2023-10-03 20:05 ` [xdp-hints] [PATCH bpf-next v3 06/10] selftests/xsk: Support tx_metadata_len Stanislav Fomichev
2023-10-03 20:05 ` [xdp-hints] [PATCH bpf-next v3 07/10] selftests/bpf: Add csum helpers Stanislav Fomichev
2023-10-03 20:05 ` Stanislav Fomichev [this message]
2023-10-03 20:05 ` [xdp-hints] [PATCH bpf-next v3 09/10] selftests/bpf: Add TX side to xdp_hw_metadata Stanislav Fomichev
2023-10-09  8:12   ` [xdp-hints] " Jesper Dangaard Brouer
2023-10-09 16:37     ` Stanislav Fomichev
2023-10-10 20:40       ` Stanislav Fomichev
2023-10-13  1:13         ` Song, Yoong Siang
2023-10-13 18:47           ` Stanislav Fomichev
2023-10-15 13:28             ` Song, Yoong Siang
2023-10-03 20:05 ` [xdp-hints] [PATCH bpf-next v3 10/10] xsk: document tx_metadata_len layout Stanislav Fomichev

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