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Thu, 29 Oct 2026 19:33:13 -0700 (PDT) Received: from localhost.localdomain ([58.247.233.220]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8a9eef95f2dsm152216b3a.10.2026.10.29.19.33.07 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 29 Oct 2026 19:33:13 -0700 (PDT) From: Rongzheng Wang To: netdev@vger.kernel.org Cc: Maciej Fijalkowski , Magnus Karlsson , Jason Xing , Stanislav Fomichev , Jesper Dangaard Brouer , stable@vger.kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, Rongzheng Wang Subject: [PATCH net v4 2/2] selftests/bpf: cover AF_XDP multi-buffer TX software checksum Date: Fri, 30 Oct 2026 10:32:48 +0800 Message-Id: <20261030023248.78802-3-testwrzwrz@gmail.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20261030023248.78802-1-testwrzwrz@gmail.com> References: <20261030023248.78802-1-testwrzwrz@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Extend test_xdp_metadata to send the same UDP packet using every descriptor count from 1 through MAX_TX_DESCS (MAX_SKB_FRAGS + 1), and to run the existing metadata and checksum verification for each case. Build the packet once and write it into the TX descriptors in a loop instead of using a flat two-descriptor layout. Keep the first descriptor large enough to cover the checksum offset; the remaining payload is split across the continuation descriptors, with the last descriptor taking the remaining length. Reuse the existing AF_XDP setup, packet generation, completion, and receive helpers in xdp_metadata.c instead of adding a separate test harness. Signed-off-by: Rongzheng Wang --- .../selftests/bpf/prog_tests/xdp_metadata.c | 147 +++++++++++------- 1 file changed, 92 insertions(+), 55 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c index 5c31054ad4a4..17da0a145666 100644 --- a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c +++ b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c @@ -18,12 +18,15 @@ #define TX_NAME "veTX" #define RX_NAME "veRX" -#define UDP_PAYLOAD_BYTES 4 +#define UDP_PAYLOAD_BYTES 32 + +#define MAX_SKB_FRAGS 17 /* minimum CONFIG_MAX_SKB_FRAGS */ +#define MAX_TX_DESCS (MAX_SKB_FRAGS + 1) #define UDP_SOURCE_PORT 1234 #define AF_XDP_CONSUMER_PORT 8080 -#define UMEM_NUM 16 +#define UMEM_NUM 64 #define UMEM_FRAME_SIZE XSK_UMEM__DEFAULT_FRAME_SIZE #define UMEM_SIZE (UMEM_FRAME_SIZE * UMEM_NUM) #define XDP_FLAGS XDP_FLAGS_DRV_MODE @@ -56,13 +59,13 @@ struct xsk { struct xsk_socket *socket; }; -static int open_xsk(int ifindex, struct xsk *xsk) +static int open_xsk(int ifindex, struct xsk *xsk, __u32 bind_flags) { int mmap_flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE; const struct xsk_socket_config socket_config = { .rx_size = XSK_RING_PROD__DEFAULT_NUM_DESCS, .tx_size = XSK_RING_PROD__DEFAULT_NUM_DESCS, - .bind_flags = XDP_COPY, + .bind_flags = bind_flags, }; const struct xsk_umem_config umem_config = { .fill_size = XSK_RING_PROD__DEFAULT_NUM_DESCS, @@ -133,31 +136,35 @@ static void close_xsk(struct xsk *xsk) munmap(xsk->umem_area, UMEM_SIZE); } -static int generate_packet(struct xsk *xsk, __u16 dst_port) +static int generate_packet(struct xsk *xsk, __u16 dst_port, u32 num) { struct xsk_tx_metadata *meta; struct xdp_desc *tx_desc; struct udphdr *udph; struct ethhdr *eth; struct iphdr *iph; + u16 first_len; + u16 pkt_len; + u8 pkt[256]; + u32 offset; void *data; __u32 idx; + u32 addr; int ret; + u32 i; - ret = xsk_ring_prod__reserve(&xsk->tx, 1, &idx); - if (!ASSERT_EQ(ret, 1, "xsk_ring_prod__reserve")) + pkt_len = sizeof(*eth) + sizeof(*iph) + sizeof(*udph) + UDP_PAYLOAD_BYTES; + first_len = sizeof(*eth) + sizeof(*iph) + sizeof(*udph); + if (!num || num > MAX_TX_DESCS || + (num > 1 && pkt_len - first_len < num - 1)) return -1; - tx_desc = xsk_ring_prod__tx_desc(&xsk->tx, idx); - 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_TXMD_FLAGS_TIMESTAMP; + ret = xsk_ring_prod__reserve(&xsk->tx, num, &idx); + if (!ASSERT_EQ(ret, num, "xsk_ring_prod__reserve")) + return -1; - eth = data; + memset(pkt, 0, sizeof(pkt)); + eth = (void *)pkt; iph = (void *)(eth + 1); udph = (void *)(iph + 1); @@ -180,18 +187,43 @@ static int generate_packet(struct xsk *xsk, __u16 dst_port) udph->source = htons(UDP_SOURCE_PORT); udph->dest = htons(dst_port); udph->len = htons(sizeof(*udph) + UDP_PAYLOAD_BYTES); + memset(udph + 1, 0xAA, UDP_PAYLOAD_BYTES); 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_TXMD_FLAGS_CHECKSUM; - meta->request.csum_start = sizeof(*eth) + sizeof(*iph); - meta->request.csum_offset = offsetof(struct udphdr, check); + for (i = 0, offset = 0; i < num; i++) { + u32 len; + + if (num == 1) + len = pkt_len; + else if (!i) + len = first_len; + else if (i == num - 1) + len = pkt_len - offset; + else + len = (pkt_len - first_len) / (num - 1); + + addr = (idx + i) % (UMEM_NUM / 2) * UMEM_FRAME_SIZE; + tx_desc = xsk_ring_prod__tx_desc(&xsk->tx, idx + i); + tx_desc->addr = addr + sizeof(*meta); + tx_desc->len = len; + tx_desc->options = i ? 0 : XDP_TX_METADATA; + if (i + 1 < num) + tx_desc->options |= XDP_PKT_CONTD; + printf("%p: tx_desc[%u]->addr=%llx\n", xsk, idx + i, tx_desc->addr); + data = xsk_umem__get_data(xsk->umem_area, tx_desc->addr); + if (!i) { + meta = data - sizeof(*meta); + memset(meta, 0, sizeof(*meta)); + meta->flags = XDP_TXMD_FLAGS_TIMESTAMP | XDP_TXMD_FLAGS_CHECKSUM; + meta->request.csum_start = sizeof(*eth) + sizeof(*iph); + meta->request.csum_offset = offsetof(struct udphdr, check); + } + memcpy(data, pkt + offset, len); + offset += len; + } - 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); + xsk_ring_prod__submit(&xsk->tx, num); ret = sendto(xsk_socket__fd(xsk->socket), NULL, 0, MSG_DONTWAIT, NULL, 0); if (!ASSERT_GE(ret, 0, "sendto")) @@ -224,24 +256,27 @@ static int generate_packet_inet(void) return err; } -static void complete_tx(struct xsk *xsk) +static void complete_tx(struct xsk *xsk, u32 num) { 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); + __u32 i; + + if (ASSERT_EQ(xsk_ring_cons__peek(&xsk->comp, num, &idx), num, + "xsk_ring_cons__peek")) { + for (i = 0; i < num; i++) { + addr = *xsk_ring_cons__comp_addr(&xsk->comp, idx + i); + printf("%p: complete tx idx=%u addr=%llx\n", xsk, idx + i, addr); + + if (i == 0) { + data = xsk_umem__get_data(xsk->umem_area, addr); + meta = data - sizeof(*meta); + ASSERT_NEQ(meta->completion.tx_timestamp, 0, "tx_timestamp"); + } + } + xsk_ring_cons__release(&xsk->comp, num); } } @@ -325,7 +360,7 @@ static int verify_xsk_metadata(struct xsk *xsk, bool sent_from_af_xdp) ASSERT_EQ(meta->rx_hash_type, 0, "rx_hash_type"); /* checksum offload */ - ASSERT_EQ(udph->check, htons(0x721c), "csum"); + ASSERT_EQ(udph->check, htons(0x1c8f), "csum"); done: xsk_ring_cons__release(&xsk->rx, 1); @@ -361,6 +396,7 @@ void test_xdp_metadata(void) int retries = 10; int rx_ifindex; int tx_ifindex; + unsigned int i; int sock_fd; int ret; @@ -398,7 +434,7 @@ void test_xdp_metadata(void) /* Setup separate AF_XDP for RX interface. */ - ret = open_xsk(rx_ifindex, &rx_xsk); + ret = open_xsk(rx_ifindex, &rx_xsk, XDP_COPY); if (!ASSERT_OK(ret, "open_xsk(RX_NAME)")) goto out; @@ -462,27 +498,28 @@ void test_xdp_metadata(void) /* Setup separate AF_XDP for TX interface nad send packet to the RX socket. */ tx_ifindex = if_nametoindex(TX_NAME); - ret = open_xsk(tx_ifindex, &tx_xsk); + ret = open_xsk(tx_ifindex, &tx_xsk, XDP_COPY | XDP_USE_SG); if (!ASSERT_OK(ret, "open_xsk(TX_NAME)")) goto out; - if (!ASSERT_GE(generate_packet(&tx_xsk, AF_XDP_CONSUMER_PORT), 0, - "generate AF_XDP_CONSUMER_PORT")) - goto out; + for (i = 1; i <= MAX_TX_DESCS; i++) { + if (!ASSERT_GE(generate_packet(&tx_xsk, AF_XDP_CONSUMER_PORT, i), 0, + "generate AF_XDP packet")) + goto out; - switch_ns_to_rx(&tok); - if (!ASSERT_OK_PTR(tok, "setns rx")) - goto out; + switch_ns_to_rx(&tok); + if (!ASSERT_OK_PTR(tok, "setns rx")) + goto out; - /* Verify packet sent from AF_XDP has proper metadata. */ - if (!ASSERT_GE(verify_xsk_metadata(&rx_xsk, true), 0, - "verify_xsk_metadata")) - goto out; + if (!ASSERT_GE(verify_xsk_metadata(&rx_xsk, true), 0, + "verify xsk metadata")) + goto out; - switch_ns_to_tx(&tok); - if (!ASSERT_OK_PTR(tok, "setns tx")) - goto out; - complete_tx(&tx_xsk); + switch_ns_to_tx(&tok); + if (!ASSERT_OK_PTR(tok, "setns tx")) + goto out; + complete_tx(&tx_xsk, i); + } /* Now check metadata of packet, generated with network stack */ if (!ASSERT_GE(generate_packet_inet(), 0, "generate UDP packet")) @@ -518,7 +555,7 @@ void test_xdp_metadata(void) goto out; /* Send packet to trigger . */ - if (!ASSERT_GE(generate_packet(&tx_xsk, AF_XDP_CONSUMER_PORT), 0, + if (!ASSERT_GE(generate_packet(&tx_xsk, AF_XDP_CONSUMER_PORT, 1), 0, "generate freplace packet")) goto out; -- 2.39.5 (Apple Git-154)