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Wed, 23 Sep 2026 12:30:04 -0700 (PDT) Date: Wed, 23 Sep 2026 12:29:57 -0700 From: Bobby Eshleman To: David Carlier Cc: netdev@vger.kernel.org, sgarzare@redhat.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, virtualization@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH net-next v2 2/2] vsock/test: cover receive queue hints Message-ID: References: <20260923184008.153541-1-devnexen@gmail.com> <20260923184008.153541-3-devnexen@gmail.com> Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260923184008.153541-3-devnexen@gmail.com> On Wed, Sep 23, 2026 at 07:40:08PM +0100, David Carlier wrote: > Add io_uring receive tests checking IORING_CQE_F_SOCK_NONEMPTY across a > partial receive, draining while the peer stays connected, EOF, a > nonblocking receive on an empty queue, a zero-length request, and a > multishot receive with provided buffers. > > Signed-off-by: David Carlier > --- > tools/testing/vsock/util.c | 9 + > tools/testing/vsock/util.h | 1 + > tools/testing/vsock/vsock_uring_test.c | 391 +++++++++++++++++++++++++ > 3 files changed, 401 insertions(+) > > diff --git a/tools/testing/vsock/util.c b/tools/testing/vsock/util.c > index fe316b02a590..299a4e8ecb63 100644 > --- a/tools/testing/vsock/util.c > +++ b/tools/testing/vsock/util.c > @@ -483,6 +483,15 @@ void recv_byte(int fd, int expected_ret, int flags) > } > } > > +void expect_res(int res, int expected, const char *what) > +{ > + if (res != expected) { > + fprintf(stderr, "%s: expected %d, got %d\n", what, expected, > + res); > + exit(EXIT_FAILURE); > + } > +} > + > /* Run test cases. The program terminates if a failure occurs. */ > void run_tests(const struct test_case *test_cases, > const struct test_opts *opts) > diff --git a/tools/testing/vsock/util.h b/tools/testing/vsock/util.h > index bf633cde82b0..9dabb547021e 100644 > --- a/tools/testing/vsock/util.h > +++ b/tools/testing/vsock/util.h > @@ -94,6 +94,7 @@ void send_buf(int fd, const void *buf, size_t len, int flags, > void recv_buf(int fd, void *buf, size_t len, int flags, ssize_t expected_ret); > void send_byte(int fd, int expected_ret, int flags); > void recv_byte(int fd, int expected_ret, int flags); > +void expect_res(int res, int expected, const char *what); > void run_tests(const struct test_case *test_cases, > const struct test_opts *opts); > void list_tests(const struct test_case *test_cases); > diff --git a/tools/testing/vsock/vsock_uring_test.c b/tools/testing/vsock/vsock_uring_test.c > index 5c3078969659..c6cc51db7adc 100644 > --- a/tools/testing/vsock/vsock_uring_test.c > +++ b/tools/testing/vsock/vsock_uring_test.c > @@ -13,7 +13,10 @@ > #include > #include > #include > +#include > #include > +#include > +#include > #include > > #include "util.h" > @@ -28,6 +31,10 @@ > > #define VSOCK_TEST_DATA_MAX_IOV 3 > > +#define HINT_CHUNK_SIZE 4096 > +#define HINT_BUF_GROUP 1 > +#define HINT_BUF_ENTRIES 4 > + > struct vsock_io_uring_test { > /* Number of valid elements in 'vecs'. */ > int vecs_cnt; > @@ -211,6 +218,365 @@ void test_stream_uring_msg_zc_client(const struct test_opts *opts) > vsock_io_uring_client(opts, &test_data_array[i], true); > } > > +struct uring_inq_ctx { > + struct io_uring ring; > + int fd; > +}; > + > +static void inq_server_init(struct uring_inq_ctx *ctx, > + const struct test_opts *opts) > +{ > + ctx->fd = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL); > + if (ctx->fd < 0) { > + perror("accept"); > + exit(EXIT_FAILURE); > + } > + > + if (io_uring_queue_init(RING_ENTRIES_NUM, &ctx->ring, 0)) > + error(1, errno, "io_uring_queue_init"); > +} > + > +static void inq_server_exit(struct uring_inq_ctx *ctx) > +{ > + io_uring_queue_exit(&ctx->ring); > + close(ctx->fd); > +} > + > +/* Submit a single receive and report both its result and its CQE flags. */ > +static int inq_recv(struct uring_inq_ctx *ctx, void *buf, size_t len, > + int flags, unsigned int *cflags) > +{ > + struct io_uring_sqe *sqe; > + struct io_uring_cqe *cqe; > + int res; > + > + sqe = io_uring_get_sqe(&ctx->ring); > + io_uring_prep_recv(sqe, ctx->fd, buf, len, flags); > + > + if (io_uring_submit(&ctx->ring) != 1) > + error(1, errno, "io_uring_submit"); > + > + if (io_uring_wait_cqe(&ctx->ring, &cqe)) > + error(1, errno, "io_uring_wait_cqe"); > + > + res = cqe->res; > + *cflags = cqe->flags; > + io_uring_cqe_seen(&ctx->ring, cqe); > + > + return res; > +} > + > +static void expect_uring_nonempty(unsigned int cflags, bool expected, > + const char *what) > +{ > + bool nonempty = !!(cflags & IORING_CQE_F_SOCK_NONEMPTY); > + > + if (nonempty != expected) { > + fprintf(stderr, "%s: expected SOCK_NONEMPTY %d, got %d\n", > + what, expected, nonempty); > + exit(EXIT_FAILURE); > + } > +} > + > +static void expect_uring_more(unsigned int cflags, bool expected, > + const char *what) > +{ > + bool more = !!(cflags & IORING_CQE_F_MORE); > + > + if (more != expected) { > + fprintf(stderr, "%s: expected F_MORE %d, got %d\n", > + what, expected, more); > + exit(EXIT_FAILURE); > + } > +} > + > +/* Wait until the whole payload is queued, so the hint is deterministic. > + * Return false if the test has to be skipped. > + */ > +static bool inq_wait_queued(int fd, int len) > +{ > + if (!vsock_ioctl_int(fd, SIOCINQ, len)) { > + fprintf(stderr, "Test skipped, SIOCINQ not supported.\n"); > + return false; > + } > + > + return true; > +} > + > +static void inq_send_chunks(const struct test_opts *opts, int chunks) > +{ > + char buf[HINT_CHUNK_SIZE]; > + int fd, i; > + > + fd = vsock_stream_connect(opts->peer_cid, opts->peer_port); > + if (fd < 0) { > + perror("connect"); > + exit(EXIT_FAILURE); > + } > + > + memset(buf, 0xa5, sizeof(buf)); > + for (i = 0; i < chunks; i++) > + send_buf(fd, buf, sizeof(buf), 0, sizeof(buf)); > + > + control_writeln("SENT"); > + control_expectln("DONE"); > + close(fd); > +} > + > +static void test_stream_uring_inq_client(const struct test_opts *opts) > +{ > + inq_send_chunks(opts, 2); > +} > + > +static void test_stream_uring_inq_server(const struct test_opts *opts) > +{ > + char buf[HINT_CHUNK_SIZE]; > + struct uring_inq_ctx ctx; > + unsigned int cflags; > + int res; > + > + inq_server_init(&ctx, opts); > + > + control_expectln("SENT"); > + if (!inq_wait_queued(ctx.fd, 2 * HINT_CHUNK_SIZE)) > + goto out; > + > + /* Data remains after this receive, so the flag must be set. */ > + res = inq_recv(&ctx, buf, sizeof(buf), 0, &cflags); > + expect_res(res, HINT_CHUNK_SIZE, "partial receive"); > + expect_uring_nonempty(cflags, true, "partial receive"); > + > + /* This receive drains the queue while the peer stays connected. */ > + res = inq_recv(&ctx, buf, sizeof(buf), 0, &cflags); > + expect_res(res, HINT_CHUNK_SIZE, "draining receive"); > + expect_uring_nonempty(cflags, false, "draining receive"); > + > +out: > + control_writeln("DONE"); > + inq_server_exit(&ctx); > +} > + > +static void test_stream_uring_inq_eof_client(const struct test_opts *opts) > +{ > + char buf[HINT_CHUNK_SIZE]; > + int fd; > + > + fd = vsock_stream_connect(opts->peer_cid, opts->peer_port); > + if (fd < 0) { > + perror("connect"); > + exit(EXIT_FAILURE); > + } > + > + memset(buf, 0x5a, sizeof(buf)); > + send_buf(fd, buf, sizeof(buf), 0, sizeof(buf)); > + control_writeln("SENT"); > + > + control_expectln("DRAINED"); > + close(fd); > + control_writeln("CLOSED"); > +} > + > +static void test_stream_uring_inq_eof_server(const struct test_opts *opts) > +{ > + char buf[HINT_CHUNK_SIZE]; > + struct uring_inq_ctx ctx; > + unsigned int cflags; > + int res; > + > + inq_server_init(&ctx, opts); > + > + control_expectln("SENT"); > + if (!inq_wait_queued(ctx.fd, HINT_CHUNK_SIZE)) { > + control_writeln("DRAINED"); > + control_expectln("CLOSED"); > + goto out; > + } > + > + res = inq_recv(&ctx, buf, sizeof(buf), 0, &cflags); > + expect_res(res, HINT_CHUNK_SIZE, "drain before EOF"); > + expect_uring_nonempty(cflags, false, "drain before EOF"); > + > + control_writeln("DRAINED"); > + control_expectln("CLOSED"); > + > + /* The queue is empty and the peer is gone. The hint stays non-zero > + * so that this receive happens and reports EOF, as TCP does after a > + * FIN. > + */ > + res = inq_recv(&ctx, buf, sizeof(buf), 0, &cflags); > + expect_res(res, 0, "receive at EOF"); > + expect_uring_nonempty(cflags, true, "receive at EOF"); > + > +out: > + inq_server_exit(&ctx); > +} > + > +static void test_stream_uring_inq_empty_client(const struct test_opts *opts) > +{ > + int fd; > + > + fd = vsock_stream_connect(opts->peer_cid, opts->peer_port); > + if (fd < 0) { > + perror("connect"); > + exit(EXIT_FAILURE); > + } > + > + control_writeln("READY"); > + control_expectln("DONE"); > + close(fd); > +} > + > +static void test_stream_uring_inq_empty_server(const struct test_opts *opts) > +{ > + char buf[HINT_CHUNK_SIZE]; > + struct uring_inq_ctx ctx; > + unsigned int cflags; > + int res; > + > + inq_server_init(&ctx, opts); > + > + control_expectln("READY"); > + > + /* A failed receive must not leave a stale positive hint. */ > + res = inq_recv(&ctx, buf, sizeof(buf), MSG_DONTWAIT, &cflags); > + expect_res(res, -EAGAIN, "empty nonblocking receive"); > + expect_uring_nonempty(cflags, false, "empty nonblocking receive"); > + > + control_writeln("DONE"); > + inq_server_exit(&ctx); > +} > + > +static void test_stream_uring_inq_zerolen_client(const struct test_opts *opts) > +{ > + inq_send_chunks(opts, 1); > +} > + > +static void test_stream_uring_inq_zerolen_server(const struct test_opts *opts) > +{ > + char buf[HINT_CHUNK_SIZE]; > + struct uring_inq_ctx ctx; > + unsigned int cflags; > + int res; > + > + inq_server_init(&ctx, opts); > + > + control_expectln("SENT"); > + if (!inq_wait_queued(ctx.fd, HINT_CHUNK_SIZE)) > + goto out; > + > + /* A zero-length request is not an error and still describes the > + * queue behind it. > + */ > + res = inq_recv(&ctx, buf, 0, 0, &cflags); > + expect_res(res, 0, "zero-length receive"); > + expect_uring_nonempty(cflags, true, "zero-length receive"); > + > +out: > + control_writeln("DONE"); > + inq_server_exit(&ctx); > +} > + > +static void test_stream_uring_inq_mshot_client(const struct test_opts *opts) > +{ > + char buf[HINT_CHUNK_SIZE]; > + int fd, i; > + > + fd = vsock_stream_connect(opts->peer_cid, opts->peer_port); > + if (fd < 0) { > + perror("connect"); > + exit(EXIT_FAILURE); > + } > + > + memset(buf, 0x3c, sizeof(buf)); > + for (i = 0; i < 2; i++) > + send_buf(fd, buf, sizeof(buf), 0, sizeof(buf)); > + control_writeln("SENT"); > + > + control_expectln("DRAINED"); > + close(fd); > + control_writeln("CLOSED"); > + > + control_expectln("DONE"); > +} > + > +static void test_stream_uring_inq_mshot_server(const struct test_opts *opts) > +{ > + static char bufs[HINT_BUF_ENTRIES][HINT_CHUNK_SIZE]; > + struct io_uring_buf_ring *br; > + struct uring_inq_ctx ctx; > + struct io_uring_sqe *sqe; > + struct io_uring_cqe *cqe; > + int i, ret; > + > + inq_server_init(&ctx, opts); > + > + br = io_uring_setup_buf_ring(&ctx.ring, HINT_BUF_ENTRIES, > + HINT_BUF_GROUP, 0, &ret); > + if (!br) { > + fprintf(stderr, "io_uring_setup_buf_ring: %d\n", ret); > + exit(EXIT_FAILURE); > + } > + > + for (i = 0; i < HINT_BUF_ENTRIES; i++) > + io_uring_buf_ring_add(br, bufs[i], HINT_CHUNK_SIZE, i, > + io_uring_buf_ring_mask(HINT_BUF_ENTRIES), > + i); > + io_uring_buf_ring_advance(br, HINT_BUF_ENTRIES); > + > + control_expectln("SENT"); > + if (!inq_wait_queued(ctx.fd, 2 * HINT_CHUNK_SIZE)) { > + control_writeln("DRAINED"); > + control_expectln("CLOSED"); > + goto out; > + } > + > + /* Arm only once both chunks are queued, so every completion knows > + * what is left behind it. > + */ > + sqe = io_uring_get_sqe(&ctx.ring); > + io_uring_prep_recv_multishot(sqe, ctx.fd, NULL, 0, 0); > + sqe->flags |= IOSQE_BUFFER_SELECT; > + sqe->buf_group = HINT_BUF_GROUP; > + > + if (io_uring_submit(&ctx.ring) != 1) > + error(1, errno, "io_uring_submit"); > + > + /* A buffer holds one chunk, so the other one is still queued. */ > + if (io_uring_wait_cqe(&ctx.ring, &cqe)) > + error(1, errno, "io_uring_wait_cqe"); > + > + expect_res(cqe->res, HINT_CHUNK_SIZE, "multishot first chunk"); > + expect_uring_nonempty(cqe->flags, true, "multishot first chunk"); > + expect_uring_more(cqe->flags, true, "multishot first chunk"); > + io_uring_cqe_seen(&ctx.ring, cqe); > + > + /* This completion drains the queue and keeps the request armed. */ > + if (io_uring_wait_cqe(&ctx.ring, &cqe)) > + error(1, errno, "io_uring_wait_cqe"); > + > + expect_res(cqe->res, HINT_CHUNK_SIZE, "multishot second chunk"); > + expect_uring_nonempty(cqe->flags, false, "multishot second chunk"); > + expect_uring_more(cqe->flags, true, "multishot second chunk"); > + io_uring_cqe_seen(&ctx.ring, cqe); > + > + control_writeln("DRAINED"); > + control_expectln("CLOSED"); > + > + /* EOF ends multishot regardless of the hint. */ > + if (io_uring_wait_cqe(&ctx.ring, &cqe)) > + error(1, errno, "io_uring_wait_cqe"); > + > + expect_res(cqe->res, 0, "multishot EOF"); > + expect_uring_more(cqe->flags, false, "multishot EOF"); > + io_uring_cqe_seen(&ctx.ring, cqe); > + > +out: > + control_writeln("DONE"); > + io_uring_free_buf_ring(&ctx.ring, br, HINT_BUF_ENTRIES, > + HINT_BUF_GROUP); > + inq_server_exit(&ctx); > +} > + > static struct test_case test_cases[] = { > { > .name = "SOCK_STREAM io_uring test", > @@ -222,6 +588,31 @@ static struct test_case test_cases[] = { > .run_server = test_stream_uring_msg_zc_server, > .run_client = test_stream_uring_msg_zc_client, > }, > + { > + .name = "SOCK_STREAM io_uring receive queue hint", > + .run_server = test_stream_uring_inq_server, > + .run_client = test_stream_uring_inq_client, > + }, > + { > + .name = "SOCK_STREAM io_uring receive hint at EOF", > + .run_server = test_stream_uring_inq_eof_server, > + .run_client = test_stream_uring_inq_eof_client, > + }, > + { > + .name = "SOCK_STREAM io_uring receive hint on empty queue", > + .run_server = test_stream_uring_inq_empty_server, > + .run_client = test_stream_uring_inq_empty_client, > + }, > + { > + .name = "SOCK_STREAM io_uring receive hint zero-length", > + .run_server = test_stream_uring_inq_zerolen_server, > + .run_client = test_stream_uring_inq_zerolen_client, > + }, > + { > + .name = "SOCK_STREAM io_uring multishot receive hint", > + .run_server = test_stream_uring_inq_mshot_server, > + .run_client = test_stream_uring_inq_mshot_client, > + }, > {}, > }; > > -- > 2.55.0 > Reviewed-by: Bobby Eshleman