* [PATCH RFC liburing 1/2] add multishot recvmsg API
2022-07-08 18:45 [PATCH RFC liburing 0/2] multishot recvmsg Dylan Yudaken
@ 2022-07-08 18:45 ` Dylan Yudaken
2022-07-08 18:45 ` [PATCH RFC liburing 2/2] add tests for multishot recvmsg Dylan Yudaken
1 sibling, 0 replies; 3+ messages in thread
From: Dylan Yudaken @ 2022-07-08 18:45 UTC (permalink / raw)
To: axboe, asml.silence; +Cc: io-uring, Kernel-team, Dylan Yudaken
This adds a new API to do multishot recvmsg. This is more complicated than
multishot recv as it requires handling a well known data layout copied by
the kernel.
Signed-off-by: Dylan Yudaken <[email protected]>
---
src/include/liburing.h | 59 +++++++++++++++++++++++++++++++++
src/include/liburing/io_uring.h | 7 ++++
2 files changed, 66 insertions(+)
diff --git a/src/include/liburing.h b/src/include/liburing.h
index d35bfa9..3f18bd2 100644
--- a/src/include/liburing.h
+++ b/src/include/liburing.h
@@ -419,6 +419,13 @@ static inline void io_uring_prep_recvmsg(struct io_uring_sqe *sqe, int fd,
sqe->msg_flags = flags;
}
+static inline void io_uring_prep_recvmsg_multishot(struct io_uring_sqe *sqe, int fd,
+ struct msghdr *msg, unsigned flags)
+{
+ io_uring_prep_recvmsg(sqe, fd, msg, flags);
+ sqe->ioprio |= IORING_RECV_MULTISHOT;
+}
+
static inline void io_uring_prep_sendmsg(struct io_uring_sqe *sqe, int fd,
const struct msghdr *msg,
unsigned flags)
@@ -685,6 +692,58 @@ static inline void io_uring_prep_recv_multishot(struct io_uring_sqe *sqe,
sqe->ioprio |= IORING_RECV_MULTISHOT;
}
+static inline struct io_uring_recvmsg_out *io_uring_recvmsg_validate(
+ void *buf, int buf_len, struct msghdr *m)
+{
+ struct io_uring_recvmsg_out *ret;
+ size_t header = m->msg_controllen + m->msg_namelen + sizeof(struct io_uring_recvmsg_out);
+
+ if (buf_len < header)
+ return NULL;
+ ret = (struct io_uring_recvmsg_out *)buf;
+ if (buf_len < header + ret->payloadlen)
+ return NULL;
+ return ret;
+}
+
+static inline void *io_uring_recvmsg_name(struct io_uring_recvmsg_out *o)
+{
+ return (void*)&o[1];
+}
+
+static inline struct cmsghdr *io_uring_recvmsg_cmsg_firsthdr(struct io_uring_recvmsg_out *o,
+ struct msghdr *m)
+{
+ if (o->controllen < sizeof(struct cmsghdr))
+ return NULL;
+ return (struct cmsghdr *)((unsigned char*)io_uring_recvmsg_name(o) + m->msg_namelen);
+}
+
+static inline void *io_uring_recvmsg_payload(struct io_uring_recvmsg_out *o,
+ struct msghdr *m)
+{
+ return (void*)((unsigned char*)io_uring_recvmsg_name(o) + m->msg_namelen + m->msg_controllen);
+}
+
+static inline struct cmsghdr *io_uring_recvmsg_cmsg_nexthdr(struct io_uring_recvmsg_out *o,
+ struct msghdr *m,
+ struct cmsghdr *cmsg)
+{
+ unsigned char *end;
+
+ if (cmsg->cmsg_len < sizeof (struct cmsghdr))
+ return NULL;
+ end = (unsigned char *)io_uring_recvmsg_payload(o, m);
+ cmsg = (struct cmsghdr *)((unsigned char *)cmsg + CMSG_ALIGN(cmsg->cmsg_len));
+
+ if ((unsigned char *)(cmsg + 1) > end)
+ return NULL;
+ if (((unsigned char *)cmsg) + CMSG_ALIGN(cmsg->cmsg_len) > end)
+ return NULL;
+
+ return cmsg;
+}
+
static inline void io_uring_prep_openat2(struct io_uring_sqe *sqe, int dfd,
const char *path, struct open_how *how)
{
diff --git a/src/include/liburing/io_uring.h b/src/include/liburing/io_uring.h
index fbf6403..5e111b4 100644
--- a/src/include/liburing/io_uring.h
+++ b/src/include/liburing/io_uring.h
@@ -573,6 +573,13 @@ struct io_uring_file_index_range {
__u64 resv;
};
+struct io_uring_recvmsg_out {
+ __u32 namelen;
+ __u32 controllen;
+ __u32 payloadlen;
+ __u32 flags;
+};
+
/*
* accept flags stored in sqe->ioprio
*/
--
2.30.2
^ permalink raw reply related [flat|nested] 3+ messages in thread* [PATCH RFC liburing 2/2] add tests for multishot recvmsg
2022-07-08 18:45 [PATCH RFC liburing 0/2] multishot recvmsg Dylan Yudaken
2022-07-08 18:45 ` [PATCH RFC liburing 1/2] add multishot recvmsg API Dylan Yudaken
@ 2022-07-08 18:45 ` Dylan Yudaken
1 sibling, 0 replies; 3+ messages in thread
From: Dylan Yudaken @ 2022-07-08 18:45 UTC (permalink / raw)
To: axboe, asml.silence; +Cc: io-uring, Kernel-team, Dylan Yudaken
Expand the multishot recv test to include recvmsg.
This also checks that sockaddr comes back, and that control messages work
properly.
Signed-off-by: Dylan Yudaken <[email protected]>
---
test/recv-multishot.c | 137 +++++++++++++++++++++++++++++++++++++-----
1 file changed, 123 insertions(+), 14 deletions(-)
diff --git a/test/recv-multishot.c b/test/recv-multishot.c
index 9df8184..b1cc335 100644
--- a/test/recv-multishot.c
+++ b/test/recv-multishot.c
@@ -27,20 +27,42 @@ enum early_error_t {
struct args {
bool stream;
bool wait_each;
+ bool recvmsg;
enum early_error_t early_error;
};
+static int check_sockaddr(struct sockaddr_in *in)
+{
+ struct in_addr expected;
+ inet_pton(AF_INET, "127.0.0.1", &expected);
+ if (in->sin_family != AF_INET) {
+ fprintf(stderr, "bad family %d\n", (int)htons(in->sin_family));
+ return -1;
+ }
+ if (memcmp(&expected, &in->sin_addr, sizeof(in->sin_addr))) {
+ char buff[256];
+ const char *addr = inet_ntop(AF_INET, &in->sin_addr, buff, sizeof(buff));
+ fprintf(stderr, "unexpected address %s\n", addr ? addr : "INVALID");
+ return -1;
+ }
+ return 0;
+}
+
static int test(struct args *args)
{
int const N = 8;
int const N_BUFFS = N * 64;
int const N_CQE_OVERFLOW = 4;
int const min_cqes = 2;
+ int const NAME_LEN = sizeof(struct sockaddr_storage);
+ int const CONTROL_LEN = CMSG_ALIGN(sizeof(struct sockaddr_storage))
+ + sizeof(struct cmsghdr);
struct io_uring ring;
struct io_uring_cqe *cqe;
struct io_uring_sqe *sqe;
int fds[2], ret, i, j, total_sent_bytes = 0, total_recv_bytes = 0;
int send_buff[256];
+ int *sent_buffs[N_BUFFS];
int *recv_buffs[N_BUFFS];
int *at;
struct io_uring_cqe recv_cqe[N_BUFFS];
@@ -50,7 +72,7 @@ static int test(struct args *args)
struct __kernel_timespec timeout = {
.tv_sec = 1,
};
-
+ struct msghdr msg;
memset(recv_buffs, 0, sizeof(recv_buffs));
@@ -75,21 +97,39 @@ static int test(struct args *args)
return ret;
}
+ if (!args->stream) {
+ bool val = true;
+ /* force some cmsgs to come back to us */
+ if (setsockopt(fds[0], IPPROTO_IP,
+ IP_RECVORIGDSTADDR, &val, sizeof(val))) {
+ fprintf(stderr, "setsockopt failed %d\n", errno);
+ goto cleanup;
+ }
+ }
+
for (i = 0; i < ARRAY_SIZE(send_buff); i++)
send_buff[i] = i;
for (i = 0; i < ARRAY_SIZE(recv_buffs); i++) {
/* prepare some different sized buffers */
- int buffer_size = (i % 2 == 0 && args->stream) ? 1 : N * sizeof(int);
+ int buffer_size = (i % 2 == 0 && args->stream) ? 1 : N;
+ buffer_size *= sizeof(int);
+ if (args->recvmsg) {
+ buffer_size +=
+ sizeof(struct io_uring_recvmsg_out) +
+ NAME_LEN +
+ CONTROL_LEN;
+ }
- recv_buffs[i] = malloc(sizeof(*at) * buffer_size);
+ recv_buffs[i] = malloc(buffer_size);
if (i > 2 && args->early_error == ERROR_NOT_ENOUGH_BUFFERS)
continue;
sqe = io_uring_get_sqe(&ring);
io_uring_prep_provide_buffers(sqe, recv_buffs[i],
- buffer_size * sizeof(*recv_buffs[i]), 1, 7, i);
+ buffer_size, 1, 7, i);
+ memset(recv_buffs[i], 0xcc, buffer_size);
if (io_uring_submit_and_wait_timeout(&ring, &cqe, 1, &timeout, NULL) != 0) {
fprintf(stderr, "provide buffers failed: %d\n", ret);
ret = -1;
@@ -99,7 +139,15 @@ static int test(struct args *args)
}
sqe = io_uring_get_sqe(&ring);
- io_uring_prep_recv_multishot(sqe, fds[0], NULL, 0, 0);
+ if (args->recvmsg) {
+ memset(&msg, 0, sizeof(msg));
+ msg.msg_namelen = NAME_LEN;
+ msg.msg_controllen = CONTROL_LEN;
+
+ io_uring_prep_recvmsg_multishot(sqe, fds[0], &msg, 0);
+ } else {
+ io_uring_prep_recv_multishot(sqe, fds[0], NULL, 0, 0);
+ }
sqe->flags |= IOSQE_BUFFER_SELECT;
sqe->buf_group = 7;
io_uring_sqe_set_data64(sqe, 1234);
@@ -111,6 +159,7 @@ static int test(struct args *args)
int to_send = sizeof(*at) * (i+1);
total_sent_bytes += to_send;
+ sent_buffs[i] = at;
if (send(fds[1], at, to_send, 0) != to_send) {
if (early_error_started)
break;
@@ -205,6 +254,8 @@ static int test(struct args *args)
if (should_be_last) {
+ int used_res = cqe->res;
+
if (!is_last) {
fprintf(stderr, "not last cqe had error %d\n", i);
goto cleanup;
@@ -234,7 +285,16 @@ static int test(struct args *args)
break;
case ERROR_NONE:
case ERROR_EARLY_CLOSE_SENDER:
- if (cqe->res != 0) {
+ if (args->recvmsg && (cqe->flags & IORING_CQE_F_BUFFER)) {
+ struct io_uring_recvmsg_out *o =
+ (struct io_uring_recvmsg_out *)recv_buffs[cqe->flags >> 16];
+ if (o->payloadlen != 0) {
+ fprintf(stderr, "early error expected 0 payloadlen, got %u\n",
+ o->payloadlen);
+ goto cleanup;
+ }
+ used_res = 0;
+ } else if (cqe->res != 0) {
fprintf(stderr, "early error: res %d\n", cqe->res);
goto cleanup;
}
@@ -254,7 +314,7 @@ static int test(struct args *args)
goto cleanup;
}
- if (cqe->res <= 0)
+ if (used_res <= 0)
continue;
} else {
if (!(cqe->flags & IORING_CQE_F_MORE)) {
@@ -268,7 +328,48 @@ static int test(struct args *args)
goto cleanup;
}
+ this_recv = recv_buffs[cqe->flags >> 16];
+
+ if (args->recvmsg) {
+ struct io_uring_recvmsg_out *o = io_uring_recvmsg_validate(
+ this_recv, cqe->res, &msg);
+ if (!o) {
+ fprintf(stderr, "bad recvmsg\n");
+ goto cleanup;
+ }
+ cqe->res = o->payloadlen;
+
+ if (!args->stream) {
+ struct cmsghdr *cmsg;
+ if (o->namelen < sizeof(struct sockaddr_in)) {
+ fprintf(stderr, "bad addr len %d",
+ o->namelen);
+ goto cleanup;
+ }
+ if (check_sockaddr((struct sockaddr_in*)io_uring_recvmsg_name(o)))
+ goto cleanup;
+
+ cmsg = io_uring_recvmsg_cmsg_firsthdr(o, &msg);
+ if (!cmsg ||
+ cmsg->cmsg_level != IPPROTO_IP ||
+ cmsg->cmsg_type != IP_RECVORIGDSTADDR) {
+ fprintf(stderr, "bad cmsg");
+ goto cleanup;
+ }
+ if (check_sockaddr((struct sockaddr_in *)CMSG_DATA(cmsg)))
+ goto cleanup;
+ cmsg = io_uring_recvmsg_cmsg_nexthdr(o, &msg, cmsg);
+ if (cmsg) {
+ fprintf(stderr, "unexpected extra cmsg\n");
+ goto cleanup;
+ }
+ }
+
+ this_recv = (int*)io_uring_recvmsg_payload(o, &msg);
+ }
+
total_recv_bytes += cqe->res;
+
if (cqe->res % 4 != 0) {
/*
* doesn't seem to happen in practice, would need some
@@ -278,9 +379,19 @@ static int test(struct args *args)
goto cleanup;
}
- /* check buffer arrived in order (for tcp) */
- this_recv = recv_buffs[cqe->flags >> 16];
- for (j = 0; args->stream && j < cqe->res / 4; j++) {
+ /*
+ * for tcp: check buffer arrived in order
+ * for udp: based on size validate data based on size
+ */
+ if (!args->stream) {
+ int sent_idx = cqe->res / sizeof(*at) - 1;
+ if (sent_idx < 0 || sent_idx > N) {
+ fprintf(stderr, "Bad sent idx: %d\n", sent_idx);
+ goto cleanup;
+ }
+ at = sent_buffs[sent_idx];
+ }
+ for (j = 0; j < cqe->res / 4; j++) {
int sent = *at++;
int recv = *this_recv++;
@@ -297,9 +408,6 @@ static int test(struct args *args)
goto cleanup;
}
- /* check the final one */
- cqe = &recv_cqe[recv_cqes-1];
-
ret = 0;
cleanup:
for (i = 0; i < ARRAY_SIZE(recv_buffs); i++)
@@ -320,10 +428,11 @@ int main(int argc, char *argv[])
if (argc > 1)
return T_EXIT_SKIP;
- for (loop = 0; loop < 4; loop++) {
+ for (loop = 0; loop < 8; loop++) {
struct args a = {
.stream = loop & 0x01,
.wait_each = loop & 0x2,
+ .recvmsg = loop & 0x04,
};
for (early_error = 0; early_error < ERROR_EARLY_LAST; early_error++) {
a.early_error = (enum early_error_t)early_error;
--
2.30.2
^ permalink raw reply related [flat|nested] 3+ messages in thread