From patchwork Wed Aug 9 16:54:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stanislav Fomichev X-Patchwork-Id: 13348180 X-Patchwork-Delegate: bpf@iogearbox.net Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 17B791DDC9 for ; Wed, 9 Aug 2023 16:54:37 +0000 (UTC) Received: from mail-pl1-x64a.google.com (mail-pl1-x64a.google.com [IPv6:2607:f8b0:4864:20::64a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0D9CD1FCC for ; Wed, 9 Aug 2023 09:54:36 -0700 (PDT) Received: by mail-pl1-x64a.google.com with SMTP id d9443c01a7336-1bc0fc321ceso1002905ad.3 for ; Wed, 09 Aug 2023 09:54:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1691600075; x=1692204875; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=j/Sx7Tf0IjSdxxFucBS6Q3KJrp9sMEyfqb/4f/adWbI=; b=JOT0ucAXIAa7X1H15/jD027uhPE4v/RknOeLZy9i4GdkqmruijwB2zecK4AwERWWKA zACfIaCSRAYc5gOkopdws+8FYD8Cl11oPo8zxWmDgoEkSeOgdvst9KL/BF37OvxCCzTS Sdp4aIZt1VedPUEFW7IUKlEgeHtoAc6E+fFrAnrOPH8ePBg0tCssysyRao386T4UGLm1 23REWrmnqEzC4mW2MSCJLm+I4iaiBDFWKO1952UzGNCoxE19qKhHsEYqz+2ih4BIFQoK rMWv7zM+m+CgY175A5XluxxZYqTZKSDX/nxuqeYR5TWja16kJwnQLOB3Sfgz7o2DD3FY DwyQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691600075; x=1692204875; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=j/Sx7Tf0IjSdxxFucBS6Q3KJrp9sMEyfqb/4f/adWbI=; b=Ekyd9M0Bc6/0fXvQdrel3Fh9aut3sNR+toP6pzQdynmnwjS610Qr/SM7O2svJbGhkH DyJtv1kvVjtpgvHRmyIs8CpVQIUyHsAZHA5ip1YN/Zq32Dj7A6Iqw3c4MkDEPkFwsePs kuHayjVwszbvHe9Kb95VVGV4Get5vlVyxDicZ2eJpw5rwEjiC89wWKM1DR9J6JcbfHnv pRiQcD2l0F5pZBqWoDHbs1kDVLAdL0/Erpntq5IMs4AaIwFlFVOz/mbmzZ+FDdp1zBOZ 3cVeM2suOPQGD5LhuqOTEgb52N7yLMjRur/Dk3tWhxl+Ngih/QDpUw9XFsUIztbnjFS1 YJiw== X-Gm-Message-State: AOJu0YxWmHCUHs5G/rk8CPo5pXzFZOphIBfrj4W5dpqWB/airyq8SAa5 Cxgx+0fKZBiC5ZUIGGhuYAulzwjjTsFUy4y4etPDV4GIYzNlzeG/Dt07tNHGWkh0L73FIT8ZjH3 XYYM7Y2S0dBngG0UgnMu9w7AwmWUy/lj+LkQ4wMrH8hh+la3VfQ== X-Google-Smtp-Source: AGHT+IGG0n+4gz9SXkTLJQ5Hmy5DKuj1fSldT7+/S/41561g4Iu13rXv6iDH/TIVKmtYo3QSW+VP5kA= X-Received: from sdf.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5935]) (user=sdf job=sendgmr) by 2002:a17:902:eccf:b0:1b9:d1bd:a656 with SMTP id a15-20020a170902eccf00b001b9d1bda656mr404178plh.4.1691600075403; Wed, 09 Aug 2023 09:54:35 -0700 (PDT) Date: Wed, 9 Aug 2023 09:54:17 -0700 In-Reply-To: <20230809165418.2831456-1-sdf@google.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20230809165418.2831456-1-sdf@google.com> X-Mailer: git-send-email 2.41.0.640.ga95def55d0-goog Message-ID: <20230809165418.2831456-9-sdf@google.com> Subject: [PATCH bpf-next 8/9] selftests/bpf: Add TX side to xdp_hw_metadata From: Stanislav Fomichev 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, netdev@vger.kernel.org, xdp-hints@xdp-project.net X-Spam-Status: No, score=-9.6 required=5.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: bpf@iogearbox.net When we get a packet on port 9091, we swap src/dst and send it out. At this point we also request the timestamp and checksum offloads. Checksum offload is verified by looking at the tcpdump on the other side. The tool prints pseudo-header csum and the final one it expects. The final checksum actually matches the incoming packets checksum because we only flip the src/dst and don't change the payload. Some other related changes: - switched to zerocopy mode by default; new flag can be used to force old behavior - request fixed TX_METADATA_LEN headroom - some other small fixes (umem size, fill idx+i, etc) mvbz3:~# ./xdp_hw_metadata eth3 ... 0x1062cb8: rx_desc[0]->addr=80100 addr=80100 comp_addr=80100 rx_hash: 0x2E1B50B9 with RSS type:0x2A rx_timestamp: 1691436369532047139 (sec:1691436369.5320) XDP RX-time: 1691436369261756803 (sec:1691436369.2618) delta sec:-0.2703 (-270290.336 usec) AF_XDP time: 1691436369261878839 (sec:1691436369.2619) delta sec:0.0001 (122.036 usec) 0x1062cb8: ping-pong with csum=3b8e (want de7e) csum_start=54 csum_offset=6 0x1062cb8: complete tx idx=0 addr=10 0x1062cb8: tx_timestamp: 1691436369598419505 (sec:1691436369.5984) 0x1062cb8: complete rx idx=128 addr=80100 mvbz4:~# nc -Nu -q1 ${MVBZ3_LINK_LOCAL_IP}%eth3 9091 mvbz4:~# tcpdump -vvx -i eth3 udp tcpdump: listening on eth3, link-type EN10MB (Ethernet), snapshot length 262144 bytes 12:26:09.301074 IP6 (flowlabel 0x35fa5, hlim 127, next-header UDP (17) payload length: 11) fe80::1270:fdff:fe48:1087.55807 > fe80::1270:fdff:fe48:1077.9091: [bad udp cksum 0x3b8e -> 0xde7e!] UDP, length 3 0x0000: 6003 5fa5 000b 117f fe80 0000 0000 0000 0x0010: 1270 fdff fe48 1087 fe80 0000 0000 0000 0x0020: 1270 fdff fe48 1077 d9ff 2383 000b 3b8e 0x0030: 7864 70 12:26:09.301976 IP6 (flowlabel 0x35fa5, hlim 127, next-header UDP (17) payload length: 11) fe80::1270:fdff:fe48:1077.9091 > fe80::1270:fdff:fe48:1087.55807: [udp sum ok] UDP, length 3 0x0000: 6003 5fa5 000b 117f fe80 0000 0000 0000 0x0010: 1270 fdff fe48 1077 fe80 0000 0000 0000 0x0020: 1270 fdff fe48 1087 2383 d9ff 000b de7e 0x0030: 7864 70 Signed-off-by: Stanislav Fomichev --- tools/testing/selftests/bpf/xdp_hw_metadata.c | 201 +++++++++++++++++- 1 file changed, 191 insertions(+), 10 deletions(-) diff --git a/tools/testing/selftests/bpf/xdp_hw_metadata.c b/tools/testing/selftests/bpf/xdp_hw_metadata.c index 613321eb84c1..05707e640e6c 100644 --- a/tools/testing/selftests/bpf/xdp_hw_metadata.c +++ b/tools/testing/selftests/bpf/xdp_hw_metadata.c @@ -10,7 +10,9 @@ * - rx_hash * * TX: - * - TBD + * - UDP 9091 packets trigger TX reply + * - TX HW timestamp is requested and reported back upon completion + * - TX checksum is requested */ #include @@ -24,14 +26,17 @@ #include #include #include +#include #include #include #include #include +#include +#include #include "xdp_metadata.h" -#define UMEM_NUM 16 +#define UMEM_NUM 256 #define UMEM_FRAME_SIZE XSK_UMEM__DEFAULT_FRAME_SIZE #define UMEM_SIZE (UMEM_FRAME_SIZE * UMEM_NUM) #define XDP_FLAGS (XDP_FLAGS_DRV_MODE | XDP_FLAGS_REPLACE) @@ -51,22 +56,24 @@ struct xsk *rx_xsk; const char *ifname; int ifindex; int rxq; +bool skip_tx; void test__fail(void) { /* for network_helpers.c */ } -static int open_xsk(int ifindex, struct xsk *xsk, __u32 queue_id) +static int open_xsk(int ifindex, struct xsk *xsk, __u32 queue_id, int flags) { int mmap_flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE; const struct xsk_socket_config socket_config = { + .tx_metadata_len = sizeof(struct xsk_tx_metadata), .rx_size = XSK_RING_PROD__DEFAULT_NUM_DESCS, .tx_size = XSK_RING_PROD__DEFAULT_NUM_DESCS, - .bind_flags = XDP_COPY, + .bind_flags = flags, }; const struct xsk_umem_config umem_config = { .fill_size = XSK_RING_PROD__DEFAULT_NUM_DESCS, .comp_size = XSK_RING_CONS__DEFAULT_NUM_DESCS, .frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE, - .flags = XDP_UMEM_UNALIGNED_CHUNK_FLAG, + .flags = XSK_UMEM__DEFAULT_FLAGS, }; __u32 idx; u64 addr; @@ -108,7 +115,7 @@ static int open_xsk(int ifindex, struct xsk *xsk, __u32 queue_id) for (i = 0; i < UMEM_NUM / 2; i++) { addr = (UMEM_NUM / 2 + i) * UMEM_FRAME_SIZE; printf("%p: rx_desc[%d] -> %lx\n", xsk, i, addr); - *xsk_ring_prod__fill_addr(&xsk->fill, i) = addr; + *xsk_ring_prod__fill_addr(&xsk->fill, idx + i) = addr; } xsk_ring_prod__submit(&xsk->fill, ret); @@ -129,12 +136,22 @@ static void refill_rx(struct xsk *xsk, __u64 addr) __u32 idx; if (xsk_ring_prod__reserve(&xsk->fill, 1, &idx) == 1) { - printf("%p: complete idx=%u addr=%llx\n", xsk, idx, addr); + printf("%p: complete rx idx=%u addr=%llx\n", xsk, idx, addr); *xsk_ring_prod__fill_addr(&xsk->fill, idx) = addr; xsk_ring_prod__submit(&xsk->fill, 1); } } +static int kick_tx(struct xsk *xsk) +{ + return sendto(xsk_socket__fd(xsk->socket), NULL, 0, MSG_DONTWAIT, NULL, 0); +} + +static int kick_rx(struct xsk *xsk) +{ + return recvfrom(xsk_socket__fd(xsk->socket), NULL, 0, MSG_DONTWAIT, NULL, NULL); +} + #define NANOSEC_PER_SEC 1000000000 /* 10^9 */ static __u64 gettime(clockid_t clock_id) { @@ -228,6 +245,116 @@ static void verify_skb_metadata(int fd) printf("skb hwtstamp is not found!\n"); } +static bool complete_tx(struct xsk *xsk) +{ + struct xsk_tx_metadata *meta; + __u64 addr; + void *data; + __u32 idx; + + if (!xsk_ring_cons__peek(&xsk->comp, 1, &idx)) + return false; + + addr = *xsk_ring_cons__comp_addr(&xsk->comp, idx); + data = xsk_umem__get_data(xsk->umem_area, addr); + meta = data - sizeof(struct xsk_tx_metadata); + + printf("%p: complete tx idx=%u addr=%llx\n", xsk, idx, addr); + printf("%p: tx_timestamp: %llu (sec:%0.4f)\n", xsk, meta->tx_timestamp, + (double)meta->tx_timestamp / NANOSEC_PER_SEC); + xsk_ring_cons__release(&xsk->comp, 1); + + return true; +} + +#define swap(a, b, len) do { \ + for (int i = 0; i < len; i++) { \ + __u8 tmp = ((__u8 *)a)[i]; \ + ((__u8 *)a)[i] = ((__u8 *)b)[i]; \ + ((__u8 *)b)[i] = tmp; \ + } \ +} while (0) + +static void ping_pong(struct xsk *xsk, void *rx_packet) +{ + struct xsk_tx_metadata *meta; + struct ipv6hdr *ip6h = NULL; + struct iphdr *iph = NULL; + struct xdp_desc *tx_desc; + struct udphdr *udph; + struct ethhdr *eth; + __sum16 want_csum; + void *data; + __u32 idx; + int ret; + int len; + + ret = xsk_ring_prod__reserve(&xsk->tx, 1, &idx); + if (ret != 1) { + printf("%p: failed to reserve tx slot\n", xsk); + return; + } + + 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); + 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 = rx_packet; + + if (eth->h_proto == htons(ETH_P_IP)) { + iph = (void *)(eth + 1); + udph = (void *)(iph + 1); + } else if (eth->h_proto == htons(ETH_P_IPV6)) { + ip6h = (void *)(eth + 1); + udph = (void *)(ip6h + 1); + } else { + printf("%p: failed to detect IP version for ping pong %04x\n", xsk, eth->h_proto); + xsk_ring_prod__cancel(&xsk->tx, 1); + return; + } + + len = ETH_HLEN; + if (ip6h) + len += sizeof(*ip6h) + ntohs(ip6h->payload_len); + if (iph) + len += ntohs(iph->tot_len); + + swap(eth->h_dest, eth->h_source, ETH_ALEN); + if (iph) + swap(&iph->saddr, &iph->daddr, 4); + else + swap(&ip6h->saddr, &ip6h->daddr, 16); + swap(&udph->source, &udph->dest, 2); + + want_csum = udph->check; + if (ip6h) + udph->check = ~csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, + ntohs(udph->len), IPPROTO_UDP, 0); + else + udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, + ntohs(udph->len), IPPROTO_UDP, 0); + + meta->flags |= XDP_TX_METADATA_CHECKSUM; + if (iph) + meta->csum_start = sizeof(*eth) + sizeof(*iph); + else + meta->csum_start = sizeof(*eth) + sizeof(*ip6h); + meta->csum_offset = offsetof(struct udphdr, check); + + printf("%p: ping-pong with csum=%04x (want %04x) csum_start=%d csum_offset=%d\n", + xsk, ntohs(udph->check), ntohs(want_csum), meta->csum_start, meta->csum_offset); + + memcpy(data, rx_packet, len); /* don't share umem chunk for simplicity */ + tx_desc->options |= XDP_TX_METADATA; + tx_desc->len = len; + + xsk_ring_prod__submit(&xsk->tx, 1); +} + static int verify_metadata(struct xsk *rx_xsk, int rxq, int server_fd, clockid_t clock_id) { const struct xdp_desc *rx_desc; @@ -250,6 +377,13 @@ static int verify_metadata(struct xsk *rx_xsk, int rxq, int server_fd, clockid_t while (true) { errno = 0; + + for (i = 0; i < rxq; i++) { + ret = kick_rx(&rx_xsk[i]); + if (ret) + printf("kick_rx ret=%d\n", ret); + } + ret = poll(fds, rxq + 1, 1000); printf("poll: %d (%d) skip=%llu fail=%llu redir=%llu\n", ret, errno, bpf_obj->bss->pkts_skip, @@ -280,6 +414,22 @@ static int verify_metadata(struct xsk *rx_xsk, int rxq, int server_fd, clockid_t xsk, idx, rx_desc->addr, addr, comp_addr); verify_xdp_metadata(xsk_umem__get_data(xsk->umem_area, addr), clock_id); + + if (!skip_tx) { + /* mirror the packet back */ + ping_pong(xsk, xsk_umem__get_data(xsk->umem_area, addr)); + + ret = kick_tx(xsk); + if (ret) + printf("kick_tx ret=%d\n", ret); + + for (int j = 0; j < 500; j++) { + if (complete_tx(xsk)) + break; + usleep(10*1000); + } + } + xsk_ring_cons__release(&xsk->rx, 1); refill_rx(xsk, comp_addr); } @@ -404,21 +554,52 @@ static void timestamping_enable(int fd, int val) error(1, errno, "setsockopt(SO_TIMESTAMPING)"); } +static void usage(const char *prog) +{ + fprintf(stderr, + "usage: %s [OPTS] \n" + "OPTS:\n" + " -r don't generate AF_XDP reply (rx metadata only)\n" + " -c run in copy mode\n", + prog); +} + int main(int argc, char *argv[]) { + int bind_flags = XDP_USE_NEED_WAKEUP | XDP_ZEROCOPY; clockid_t clock_id = CLOCK_TAI; int server_fd = -1; + int opt; int ret; int i; struct bpf_program *prog; - if (argc != 2) { + while ((opt = getopt(argc, argv, "rc")) != -1) { + switch (opt) { + case 'r': + skip_tx = true; + break; + case 'c': + bind_flags = XDP_USE_NEED_WAKEUP | XDP_COPY; + break; + default: + usage(basename(argv[0])); + return 1; + } + } + + if (argc < 2) { fprintf(stderr, "pass device name\n"); return -1; } - ifname = argv[1]; + if (optind >= argc) { + usage(basename(argv[0])); + return 1; + } + + ifname = argv[optind]; ifindex = if_nametoindex(ifname); rxq = rxq_num(ifname); @@ -432,7 +613,7 @@ int main(int argc, char *argv[]) for (i = 0; i < rxq; i++) { printf("open_xsk(%s, %p, %d)\n", ifname, &rx_xsk[i], i); - ret = open_xsk(ifindex, &rx_xsk[i], i); + ret = open_xsk(ifindex, &rx_xsk[i], i, bind_flags); if (ret) error(1, -ret, "open_xsk");