--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+/* Basic per-epoll context busy poll test.
+ *
+ * Only tests the ioctls, but should be expanded to test two connected hosts in
+ * the future
+ */
+
+#define _GNU_SOURCE
+
+#include <error.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/capability.h>
+
+#include <sys/epoll.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+
+#include "../kselftest_harness.h"
+
+/* if the headers haven't been updated, we need to define some things */
+#if !defined(EPOLL_IOC_TYPE)
+struct epoll_params {
+ uint32_t busy_poll_usecs;
+ uint16_t busy_poll_budget;
+ uint8_t prefer_busy_poll;
+
+ /* pad the struct to a multiple of 64bits */
+ uint8_t __pad;
+};
+
+#define EPOLL_IOC_TYPE 0x8A
+#define EPIOCSPARAMS _IOW(EPOLL_IOC_TYPE, 0x01, struct epoll_params)
+#define EPIOCGPARAMS _IOR(EPOLL_IOC_TYPE, 0x02, struct epoll_params)
+#endif
+
+FIXTURE(invalid_fd)
+{
+ int invalid_fd;
+ struct epoll_params params;
+};
+
+FIXTURE_SETUP(invalid_fd)
+{
+ int ret;
+
+ ret = socket(AF_UNIX, SOCK_DGRAM, 0);
+ EXPECT_NE(-1, ret)
+ TH_LOG("error creating unix socket");
+
+ self->invalid_fd = ret;
+}
+
+FIXTURE_TEARDOWN(invalid_fd)
+{
+ int ret;
+
+ ret = close(self->invalid_fd);
+ EXPECT_EQ(0, ret);
+}
+
+TEST_F(invalid_fd, test_invalid_fd)
+{
+ int ret;
+
+ ret = ioctl(self->invalid_fd, EPIOCGPARAMS, &self->params);
+
+ EXPECT_EQ(-1, ret)
+ TH_LOG("EPIOCGPARAMS on invalid epoll FD should error");
+
+ EXPECT_EQ(ENOTTY, errno)
+ TH_LOG("EPIOCGPARAMS on invalid epoll FD should set errno to ENOTTY");
+
+ memset(&self->params, 0, sizeof(struct epoll_params));
+
+ ret = ioctl(self->invalid_fd, EPIOCSPARAMS, &self->params);
+
+ EXPECT_EQ(-1, ret)
+ TH_LOG("EPIOCSPARAMS on invalid epoll FD should error");
+
+ EXPECT_EQ(ENOTTY, errno)
+ TH_LOG("EPIOCSPARAMS on invalid epoll FD should set errno to ENOTTY");
+}
+
+FIXTURE(epoll_busy_poll)
+{
+ int fd;
+ struct epoll_params params;
+ struct epoll_params *invalid_params;
+ cap_t caps;
+};
+
+FIXTURE_SETUP(epoll_busy_poll)
+{
+ int ret;
+
+ ret = epoll_create1(0);
+ EXPECT_NE(-1, ret)
+ TH_LOG("epoll_create1 failed?");
+
+ self->fd = ret;
+
+ self->caps = cap_get_proc();
+ EXPECT_NE(NULL, self->caps);
+}
+
+FIXTURE_TEARDOWN(epoll_busy_poll)
+{
+ int ret;
+
+ ret = close(self->fd);
+ EXPECT_EQ(0, ret);
+
+ ret = cap_free(self->caps);
+ EXPECT_NE(-1, ret)
+ TH_LOG("unable to free capabilities");
+}
+
+TEST_F(epoll_busy_poll, test_get_params)
+{
+ /* begin by getting the epoll params from the kernel
+ *
+ * the default should be default and all fields should be zero'd by the
+ * kernel, so set params fields to garbage to test this.
+ */
+ int ret = 0;
+
+ self->params.busy_poll_usecs = 0xff;
+ self->params.busy_poll_budget = 0xff;
+ self->params.prefer_busy_poll = 1;
+ self->params.__pad = 0xf;
+
+ ret = ioctl(self->fd, EPIOCGPARAMS, &self->params);
+ EXPECT_EQ(0, ret)
+ TH_LOG("ioctl EPIOCGPARAMS should succeed");
+
+ EXPECT_EQ(0, self->params.busy_poll_usecs)
+ TH_LOG("EPIOCGPARAMS busy_poll_usecs should have been 0");
+
+ EXPECT_EQ(0, self->params.busy_poll_budget)
+ TH_LOG("EPIOCGPARAMS busy_poll_budget should have been 0");
+
+ EXPECT_EQ(0, self->params.prefer_busy_poll)
+ TH_LOG("EPIOCGPARAMS prefer_busy_poll should have been 0");
+
+ EXPECT_EQ(0, self->params.__pad)
+ TH_LOG("EPIOCGPARAMS __pad should have been 0");
+
+ self->invalid_params = (struct epoll_params *)0xdeadbeef;
+ ret = ioctl(self->fd, EPIOCGPARAMS, self->invalid_params);
+
+ EXPECT_EQ(-1, ret)
+ TH_LOG("EPIOCGPARAMS should error with invalid params");
+
+ EXPECT_EQ(EFAULT, errno)
+ TH_LOG("EPIOCGPARAMS with invalid params should set errno to EFAULT");
+}
+
+TEST_F(epoll_busy_poll, test_set_invalid)
+{
+ int ret;
+
+ memset(&self->params, 0, sizeof(struct epoll_params));
+
+ self->params.__pad = 1;
+
+ ret = ioctl(self->fd, EPIOCSPARAMS, &self->params);
+
+ EXPECT_EQ(-1, ret)
+ TH_LOG("EPIOCSPARAMS non-zero __pad should error");
+
+ EXPECT_EQ(EINVAL, errno)
+ TH_LOG("EPIOCSPARAMS non-zero __pad errno should be EINVAL");
+
+ self->params.__pad = 0;
+ self->params.busy_poll_usecs = (uint32_t)INT_MAX + 1;
+
+ ret = ioctl(self->fd, EPIOCSPARAMS, &self->params);
+
+ EXPECT_EQ(-1, ret)
+ TH_LOG("EPIOCSPARAMS should error busy_poll_usecs > S32_MAX");
+
+ EXPECT_EQ(EINVAL, errno)
+ TH_LOG("EPIOCSPARAMS busy_poll_usecs > S32_MAX errno should be EINVAL");
+
+ self->params.__pad = 0;
+ self->params.busy_poll_usecs = 32;
+ self->params.prefer_busy_poll = 2;
+
+ ret = ioctl(self->fd, EPIOCSPARAMS, &self->params);
+
+ EXPECT_EQ(-1, ret)
+ TH_LOG("EPIOCSPARAMS should error prefer_busy_poll > 1");
+
+ EXPECT_EQ(EINVAL, errno)
+ TH_LOG("EPIOCSPARAMS prefer_busy_poll > 1 errno should be EINVAL");
+
+ self->params.__pad = 0;
+ self->params.busy_poll_usecs = 32;
+ self->params.prefer_busy_poll = 1;
+
+ /* set budget well above kernel's NAPI_POLL_WEIGHT of 64 */
+ self->params.busy_poll_budget = UINT16_MAX;
+
+ /* test harness should run with CAP_NET_ADMIN, but let's make sure */
+ cap_flag_value_t tmp;
+
+ ret = cap_get_flag(self->caps, CAP_NET_ADMIN, CAP_EFFECTIVE, &tmp);
+ EXPECT_EQ(0, ret)
+ TH_LOG("unable to get CAP_NET_ADMIN cap flag");
+
+ EXPECT_EQ(CAP_SET, tmp)
+ TH_LOG("expecting CAP_NET_ADMIN to be set for the test harness");
+
+ /* at this point we know CAP_NET_ADMIN is available, so setting the
+ * params with a busy_poll_budget > NAPI_POLL_WEIGHT should succeed
+ */
+ ret = ioctl(self->fd, EPIOCSPARAMS, &self->params);
+
+ EXPECT_EQ(0, ret)
+ TH_LOG("EPIOCSPARAMS should allow busy_poll_budget > NAPI_POLL_WEIGHT");
+
+ /* remove CAP_NET_ADMIN from our effective set */
+ cap_value_t net_admin[] = { CAP_NET_ADMIN };
+
+ ret = cap_set_flag(self->caps, CAP_EFFECTIVE, 1, net_admin, CAP_CLEAR);
+ EXPECT_EQ(0, ret)
+ TH_LOG("couldnt clear CAP_NET_ADMIN");
+
+ ret = cap_set_proc(self->caps);
+ EXPECT_EQ(0, ret)
+ TH_LOG("cap_set_proc should drop CAP_NET_ADMIN");
+
+ /* this is now expected to fail */
+ ret = ioctl(self->fd, EPIOCSPARAMS, &self->params);
+
+ EXPECT_EQ(-1, ret)
+ TH_LOG("EPIOCSPARAMS should error busy_poll_budget > NAPI_POLL_WEIGHT");
+
+ EXPECT_EQ(EPERM, errno)
+ TH_LOG("EPIOCSPARAMS errno should be EPERM busy_poll_budget > NAPI_POLL_WEIGHT");
+
+ /* restore CAP_NET_ADMIN to our effective set */
+ ret = cap_set_flag(self->caps, CAP_EFFECTIVE, 1, net_admin, CAP_SET);
+ EXPECT_EQ(0, ret)
+ TH_LOG("couldn't restore CAP_NET_ADMIN");
+
+ ret = cap_set_proc(self->caps);
+ EXPECT_EQ(0, ret)
+ TH_LOG("cap_set_proc should set CAP_NET_ADMIN");
+
+ self->invalid_params = (struct epoll_params *)0xdeadbeef;
+ ret = ioctl(self->fd, EPIOCSPARAMS, self->invalid_params);
+
+ EXPECT_EQ(-1, ret)
+ TH_LOG("EPIOCSPARAMS should error when epoll_params is invalid");
+
+ EXPECT_EQ(EFAULT, errno)
+ TH_LOG("EPIOCSPARAMS should set errno to EFAULT when epoll_params is invalid");
+}
+
+TEST_F(epoll_busy_poll, test_set_and_get_valid)
+{
+ int ret;
+
+ memset(&self->params, 0, sizeof(struct epoll_params));
+
+ self->params.busy_poll_usecs = 25;
+ self->params.busy_poll_budget = 16;
+ self->params.prefer_busy_poll = 1;
+
+ ret = ioctl(self->fd, EPIOCSPARAMS, &self->params);
+
+ EXPECT_EQ(0, ret)
+ TH_LOG("EPIOCSPARAMS with valid params should not error");
+
+ /* check that the kernel returns the same values back */
+
+ memset(&self->params, 0, sizeof(struct epoll_params));
+
+ ret = ioctl(self->fd, EPIOCGPARAMS, &self->params);
+
+ EXPECT_EQ(0, ret)
+ TH_LOG("EPIOCGPARAMS should not error");
+
+ EXPECT_EQ(25, self->params.busy_poll_usecs)
+ TH_LOG("params.busy_poll_usecs incorrect");
+
+ EXPECT_EQ(16, self->params.busy_poll_budget)
+ TH_LOG("params.busy_poll_budget incorrect");
+
+ EXPECT_EQ(1, self->params.prefer_busy_poll)
+ TH_LOG("params.prefer_busy_poll incorrect");
+
+ EXPECT_EQ(0, self->params.__pad)
+ TH_LOG("params.__pad was not 0");
+}
+
+TEST_F(epoll_busy_poll, test_invalid_ioctl)
+{
+ int invalid_ioctl = EPIOCGPARAMS + 10;
+ int ret;
+
+ ret = ioctl(self->fd, invalid_ioctl, &self->params);
+
+ EXPECT_EQ(-1, ret)
+ TH_LOG("invalid ioctl should return error");
+
+ EXPECT_EQ(EINVAL, errno)
+ TH_LOG("invalid ioctl should set errno to EINVAL");
+}
+
+TEST_HARNESS_MAIN
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