From feb973a9094ff92fb8c141be5d2e762f9ab36a7a Mon Sep 17 00:00:00 2001 From: Magnus Karlsson Date: Tue, 16 May 2023 12:31:02 +0200 Subject: [PATCH] selftests/xsk: add varying payload pattern within packet Add a varying payload pattern within the packet. Instead of having just a packet number that is the same for all words in a packet, make each word different in the packet. The upper 16-bits are set to the packet number and the lower 16-bits are the sequence number of the words in this packet. So the 3rd packet's 5th 32-bit word of data will contain the number (2<<32) | 4 as they are numbered from 0. This will make it easier to detect fragments that are out of order when starting to test multi-buffer support. The member payload in the packet is renamed pkt_nb to reflect that it is now only a pkt_nb, not the real payload as seen above. Signed-off-by: Magnus Karlsson Link: https://lore.kernel.org/r/20230516103109.3066-4-magnus.karlsson@gmail.com Signed-off-by: Alexei Starovoitov --- tools/testing/selftests/bpf/xskxceiver.c | 68 +++++++++++++++++++++----------- tools/testing/selftests/bpf/xskxceiver.h | 3 +- 2 files changed, 47 insertions(+), 24 deletions(-) diff --git a/tools/testing/selftests/bpf/xskxceiver.c b/tools/testing/selftests/bpf/xskxceiver.c index c134788..818b713 100644 --- a/tools/testing/selftests/bpf/xskxceiver.c +++ b/tools/testing/selftests/bpf/xskxceiver.c @@ -138,15 +138,16 @@ static void report_failure(struct test_spec *test) test->fail = true; } -static void memset32_htonl(void *dest, u32 val, u32 size) +/* The payload is a word consisting of a packet sequence number in the upper + * 16-bits and a intra packet data sequence number in the lower 16 bits. So the 3rd packet's + * 5th word of data will contain the number (2<<16) | 4 as they are numbered from 0. + */ +static void write_payload(void *dest, u32 val, u32 size) { - u32 *ptr = (u32 *)dest; - int i; + u32 *ptr = (u32 *)dest, i; - val = htonl(val); - - for (i = 0; i < (size & (~0x3)); i += 4) - ptr[i >> 2] = val; + for (i = 0; i < size / sizeof(*ptr); i++) + ptr[i] = htonl(val << 16 | i); } static void gen_eth_hdr(struct ifobject *ifobject, struct ethhdr *eth_hdr) @@ -532,7 +533,7 @@ static struct pkt_stream *pkt_stream_generate(struct xsk_umem_info *umem, u32 nb for (i = 0; i < nb_pkts; i++) { pkt_set(umem, &pkt_stream->pkts[i], (i % umem->num_frames) * umem->frame_size, pkt_len); - pkt_stream->pkts[i].payload = i; + pkt_stream->pkts[i].pkt_nb = i; } return pkt_stream; @@ -603,7 +604,7 @@ static struct pkt *pkt_generate(struct ifobject *ifobject, u32 pkt_nb) eth_hdr = data; gen_eth_hdr(ifobject, eth_hdr); - memset32_htonl(data + PKT_HDR_SIZE, pkt_nb, pkt->len - PKT_HDR_SIZE); + write_payload(data + PKT_HDR_SIZE, pkt_nb, pkt->len - PKT_HDR_SIZE); return pkt; } @@ -621,7 +622,7 @@ static void __pkt_stream_generate_custom(struct ifobject *ifobj, for (i = 0; i < nb_pkts; i++) { pkt_stream->pkts[i].addr = pkts[i].addr + ifobj->umem->base_addr; pkt_stream->pkts[i].len = pkts[i].len; - pkt_stream->pkts[i].payload = i; + pkt_stream->pkts[i].pkt_nb = i; pkt_stream->pkts[i].valid = pkts[i].valid; } @@ -634,10 +635,24 @@ static void pkt_stream_generate_custom(struct test_spec *test, struct pkt *pkts, __pkt_stream_generate_custom(test->ifobj_rx, pkts, nb_pkts); } -static void pkt_dump(void *pkt) +static void pkt_print_data(u32 *data, u32 cnt) +{ + u32 i; + + for (i = 0; i < cnt; i++) { + u32 seqnum, pkt_nb; + + seqnum = ntohl(*data) & 0xffff; + pkt_nb = ntohl(*data) >> 16; + fprintf(stdout, "%u:%u ", pkt_nb, seqnum); + data++; + } +} + +static void pkt_dump(void *pkt, u32 len) { struct ethhdr *ethhdr = pkt; - u32 payload, i; + u32 i; /*extract L2 frame */ fprintf(stdout, "DEBUG>> L2: dst mac: "); @@ -649,10 +664,15 @@ static void pkt_dump(void *pkt) fprintf(stdout, "%02X", ethhdr->h_source[i]); /*extract L5 frame */ - payload = ntohl(*((u32 *)(pkt + PKT_HDR_SIZE))); - - fprintf(stdout, "\nDEBUG>> L5: payload: %d\n", payload); - fprintf(stdout, "---------------------------------------\n"); + fprintf(stdout, "\nDEBUG>> L5: seqnum: "); + pkt_print_data(pkt + PKT_HDR_SIZE, PKT_DUMP_NB_TO_PRINT); + fprintf(stdout, "...."); + if (len > PKT_DUMP_NB_TO_PRINT * sizeof(u32)) { + fprintf(stdout, "\n.... "); + pkt_print_data(pkt + PKT_HDR_SIZE + len - PKT_DUMP_NB_TO_PRINT * sizeof(u32), + PKT_DUMP_NB_TO_PRINT); + } + fprintf(stdout, "\n---------------------------------------\n"); } static bool is_offset_correct(struct xsk_umem_info *umem, struct pkt_stream *pkt_stream, u64 addr, @@ -678,9 +698,9 @@ static bool is_metadata_correct(struct pkt *pkt, void *buffer, u64 addr) void *data = xsk_umem__get_data(buffer, addr); struct xdp_info *meta = data - sizeof(struct xdp_info); - if (meta->count != pkt->payload) { + if (meta->count != pkt->pkt_nb) { ksft_print_msg("[%s] expected meta_count [%d], got meta_count [%d]\n", - __func__, pkt->payload, meta->count); + __func__, pkt->pkt_nb, meta->count); return false; } @@ -690,7 +710,7 @@ static bool is_metadata_correct(struct pkt *pkt, void *buffer, u64 addr) static bool is_pkt_valid(struct pkt *pkt, void *buffer, u64 addr, u32 len) { void *data = xsk_umem__get_data(buffer, addr); - u32 seqnum; + u32 seqnum, pkt_data; if (!pkt) { ksft_print_msg("[%s] too many packets received\n", __func__); @@ -708,13 +728,15 @@ static bool is_pkt_valid(struct pkt *pkt, void *buffer, u64 addr, u32 len) return false; } - seqnum = ntohl(*((u32 *)(data + PKT_HDR_SIZE))); + pkt_data = ntohl(*((u32 *)(data + PKT_HDR_SIZE))); + seqnum = pkt_data >> 16; + if (opt_pkt_dump) - pkt_dump(data); + pkt_dump(data, len); - if (pkt->payload != seqnum) { + if (pkt->pkt_nb != seqnum) { ksft_print_msg("[%s] expected seqnum [%d], got seqnum [%d]\n", - __func__, pkt->payload, seqnum); + __func__, pkt->pkt_nb, seqnum); return false; } diff --git a/tools/testing/selftests/bpf/xskxceiver.h b/tools/testing/selftests/bpf/xskxceiver.h index 8b09471..91022c4 100644 --- a/tools/testing/selftests/bpf/xskxceiver.h +++ b/tools/testing/selftests/bpf/xskxceiver.h @@ -48,6 +48,7 @@ #define UMEM_HEADROOM_TEST_SIZE 128 #define XSK_UMEM__INVALID_FRAME_SIZE (XSK_UMEM__DEFAULT_FRAME_SIZE + 1) #define HUGEPAGE_SIZE (2 * 1024 * 1024) +#define PKT_DUMP_NB_TO_PRINT 16 #define print_verbose(x...) do { if (opt_verbose) ksft_print_msg(x); } while (0) @@ -111,7 +112,7 @@ struct xsk_socket_info { struct pkt { u64 addr; u32 len; - u32 payload; + u32 pkt_nb; bool valid; }; -- 2.7.4