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homa_plumbing.c
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/* Copyright (c) 2019-2022 Stanford University
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* This file consists mostly of "glue" that hooks Homa into the rest of
* the Linux kernel. The guts of the protocol are in other files.
*/
#include "homa_impl.h"
#include "homa_lcache.h"
#ifndef __UNIT_TEST__
MODULE_LICENSE("Dual MIT/GPL");
#endif
MODULE_AUTHOR("John Ousterhout");
MODULE_DESCRIPTION("Homa transport protocol");
MODULE_VERSION("0.01");
/* Not yet sure what these variables are for */
long sysctl_homa_mem[3] __read_mostly;
int sysctl_homa_rmem_min __read_mostly;
int sysctl_homa_wmem_min __read_mostly;
atomic_long_t homa_memory_allocated;
/* Global data for Homa. Never reference homa_data directory. Always use
* the homa variable instead; this allows overriding during unit tests.
*/
struct homa homa_data;
struct homa *homa = &homa_data;
/* True means that the Homa module is in the process of unloading itself,
* so everyone should clean up.
*/
static bool exiting = false;
/* Thread that runs timer code to detect lost packets and crashed peers. */
static struct task_struct *timer_kthread;
/* Set via sysctl to request that information on a particular topic
* be printed to the system log. The value written determines the
* topic.
*/
static int log_topic;
/*
* This is mandatory, or proto_register fails
*/
DEFINE_PER_CPU(int, homa_memory_per_cpu_fw_alloc);
EXPORT_PER_CPU_SYMBOL_GPL(homa_memory_per_cpu_fw_alloc);
/* This structure defines functions that handle various operations on
* Homa sockets. These functions are relatively generic: they are called
* to implement top-level system calls. Many of these operations can
* be implemented by PF_INET6 functions that are independent of the
* Homa protocol.
*/
const struct proto_ops homa_proto_ops = {
.family = PF_INET,
.owner = THIS_MODULE,
.release = inet_release,
.bind = homa_bind,
.connect = inet_dgram_connect,
.socketpair = sock_no_socketpair,
.accept = sock_no_accept,
.getname = inet_getname,
.poll = homa_poll,
.ioctl = inet_ioctl,
.listen = sock_no_listen,
.shutdown = homa_shutdown,
.setsockopt = sock_common_setsockopt,
.getsockopt = sock_common_getsockopt,
.sendmsg = inet_sendmsg,
.recvmsg = inet_recvmsg,
.mmap = sock_no_mmap,
.sendpage = sock_no_sendpage,
.set_peek_off = sk_set_peek_off,
};
const struct proto_ops homav6_proto_ops = {
.family = PF_INET6,
.owner = THIS_MODULE,
.release = inet6_release,
.bind = homa_bind,
.connect = inet_dgram_connect,
.socketpair = sock_no_socketpair,
.accept = sock_no_accept,
.getname = inet6_getname,
.poll = homa_poll,
.ioctl = inet6_ioctl,
.listen = sock_no_listen,
.shutdown = homa_shutdown,
.setsockopt = sock_common_setsockopt,
.getsockopt = sock_common_getsockopt,
.sendmsg = inet_sendmsg,
.recvmsg = inet_recvmsg,
.mmap = sock_no_mmap,
.sendpage = sock_no_sendpage,
.set_peek_off = sk_set_peek_off,
};
/* This structure also defines functions that handle various operations
* on Homa sockets. However, these functions are lower-level than those
* in homa_proto_ops: they are specific to the PF_INET or PF_INET6
* protocol family, and in many cases they are invoked by functions in
* homa_proto_ops. Most of these functions have Homa-specific implementations.
*/
struct proto homa_prot = {
.name = "HOMA",
.owner = THIS_MODULE,
.close = homa_close,
.connect = ip4_datagram_connect,
.disconnect = homa_disconnect,
.ioctl = homa_ioctl,
.init = homa_socket,
.destroy = 0,
.setsockopt = homa_setsockopt,
.getsockopt = homa_getsockopt,
.sendmsg = homa_sendmsg,
.recvmsg = homa_recvmsg,
.sendpage = homa_sendpage,
.backlog_rcv = homa_backlog_rcv,
.release_cb = ip4_datagram_release_cb,
.hash = homa_hash,
.unhash = homa_unhash,
.rehash = homa_rehash,
.get_port = homa_get_port,
.memory_allocated = &homa_memory_allocated,
.sysctl_mem = sysctl_homa_mem,
.sysctl_wmem = &sysctl_homa_wmem_min,
.sysctl_rmem = &sysctl_homa_rmem_min,
.obj_size = sizeof(struct homa_sock),
.diag_destroy = homa_diag_destroy,
.per_cpu_fw_alloc = &homa_memory_per_cpu_fw_alloc,
};
struct proto homav6_prot = {
.name = "HOMAv6",
.owner = THIS_MODULE,
.close = homa_close,
.connect = ip6_datagram_connect,
.disconnect = homa_disconnect,
.ioctl = homa_ioctl,
.init = homa_socket,
.destroy = 0,
.setsockopt = homa_setsockopt,
.getsockopt = homa_getsockopt,
.sendmsg = homa_sendmsg,
.recvmsg = homa_recvmsg,
.sendpage = homa_sendpage,
.backlog_rcv = homa_backlog_rcv,
.release_cb = ip6_datagram_release_cb,
.hash = homa_hash,
.unhash = homa_unhash,
.rehash = homa_rehash,
.get_port = homa_get_port,
.memory_allocated = &homa_memory_allocated,
.sysctl_mem = sysctl_homa_mem,
.sysctl_wmem = &sysctl_homa_wmem_min,
.sysctl_rmem = &sysctl_homa_rmem_min,
/* IPv6 data comes *after* Homa's data, and isn't included in
* struct homa_sock.
*/
.obj_size = sizeof(struct homa_sock) + sizeof(struct ipv6_pinfo),
.diag_destroy = homa_diag_destroy,
.per_cpu_fw_alloc = &homa_memory_per_cpu_fw_alloc,
};
/* Top-level structure describing the Homa protocol. */
struct inet_protosw homa_protosw = {
.type = SOCK_DGRAM,
.protocol = IPPROTO_HOMA,
.prot = &homa_prot,
.ops = &homa_proto_ops,
.flags = INET_PROTOSW_REUSE,
};
struct inet_protosw homav6_protosw = {
.type = SOCK_DGRAM,
.protocol = IPPROTO_HOMA,
.prot = &homav6_prot,
.ops = &homav6_proto_ops,
.flags = INET_PROTOSW_REUSE,
};
/* This structure is used by IP to deliver incoming Homa packets to us. */
static struct net_protocol homa_protocol = {
.handler = homa_softirq,
.err_handler = homa_err_handler_v4,
.no_policy = 1,
};
static struct inet6_protocol homav6_protocol = {
.handler = homa_softirq,
.err_handler = homa_err_handler_v6,
.flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
};
/* Describes file operations implemented for /proc/net/homa_metrics. */
static const struct proc_ops homa_metrics_pops = {
.proc_open = homa_metrics_open,
.proc_read = homa_metrics_read,
.proc_lseek = homa_metrics_lseek,
.proc_release = homa_metrics_release,
};
/* Used to remove /proc/net/homa_metrics when the module is unloaded. */
static struct proc_dir_entry *metrics_dir_entry = NULL;
/* Used to configure sysctl access to Homa configuration parameters.*/
static struct ctl_table homa_ctl_table[] = {
{
.procname = "cutoff_version",
.data = &homa_data.cutoff_version,
.maxlen = sizeof(int),
.mode = 0444,
.proc_handler = proc_dointvec
},
{
.procname = "dead_buffs_limit",
.data = &homa_data.dead_buffs_limit,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "duty_cycle",
.data = &homa_data.duty_cycle,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = homa_dointvec
},
{
.procname = "flags",
.data = &homa_data.flags,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "freeze_type",
.data = &homa_data.freeze_type,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "grant_fifo_fraction",
.data = &homa_data.grant_fifo_fraction,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = homa_dointvec
},
{
.procname = "fifo_grant_increment",
.data = &homa_data.fifo_grant_increment,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = homa_dointvec
},
{
.procname = "gro_busy_us",
.data = &homa_data.gro_busy_usecs,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = homa_dointvec
},
{
.procname = "gro_policy",
.data = &homa_data.gro_policy,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "link_mbps",
.data = &homa_data.link_mbps,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = homa_dointvec
},
{
.procname = "log_topic",
.data = &log_topic,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = homa_dointvec
},
{
.procname = "pacer_fifo_fraction",
.data = &homa_data.pacer_fifo_fraction,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = homa_dointvec
},
{
.procname = "max_dead_buffs",
.data = &homa_data.max_dead_buffs,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "max_grant_window",
.data = &homa_data.max_grant_window,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = homa_dointvec
},
{
.procname = "max_gro_skbs",
.data = &homa_data.max_gro_skbs,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = homa_dointvec
},
{
.procname = "max_gso_size",
.data = &homa_data.max_gso_size,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = homa_dointvec
},
{
.procname = "max_nic_queue_ns",
.data = &homa_data.max_nic_queue_ns,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = homa_dointvec
},
{
.procname = "max_overcommit",
.data = &homa_data.max_overcommit,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = homa_dointvec
},
{
.procname = "max_sched_prio",
.data = &homa_data.max_sched_prio,
.maxlen = sizeof(int),
.mode = 0444,
.proc_handler = proc_dointvec
},
{
.procname = "num_priorities",
.data = &homa_data.num_priorities,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = homa_dointvec
},
{
.procname = "poll_usecs",
.data = &homa_data.poll_usecs,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = homa_dointvec
},
{
.procname = "priority_map",
.data = &homa_data.priority_map,
.maxlen = HOMA_MAX_PRIORITIES*sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "reap_limit",
.data = &homa_data.reap_limit,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "request_ack_ticks",
.data = &homa_data.request_ack_ticks,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "resend_interval",
.data = &homa_data.resend_interval,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "resend_ticks",
.data = &homa_data.resend_ticks,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "rtt_bytes",
.data = &homa_data.rtt_bytes,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = homa_dointvec
},
{
.procname = "sync_freeze",
.data = &homa_data.sync_freeze,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = homa_dointvec
},
{
.procname = "temp",
.data = homa_data.temp,
.maxlen = sizeof(homa_data.temp),
.mode = 0644,
.proc_handler = homa_dointvec
},
{
.procname = "throttle_min_bytes",
.data = &homa_data.throttle_min_bytes,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "timeout_resends",
.data = &homa_data.timeout_resends,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "unsched_cutoffs",
.data = &homa_data.unsched_cutoffs,
.maxlen = HOMA_MAX_PRIORITIES*sizeof(int),
.mode = 0644,
.proc_handler = homa_dointvec
},
{
.procname = "verbose",
.data = &homa_data.verbose,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = homa_dointvec
},
{}
};
/* Sizes of the headers for each Homa packet type, in bytes. */
static __u16 header_lengths[] = {
sizeof32(struct data_header),
sizeof32(struct grant_header),
sizeof32(struct resend_header),
sizeof32(struct unknown_header),
sizeof32(struct busy_header),
sizeof32(struct cutoffs_header),
sizeof32(struct freeze_header),
sizeof32(struct need_ack_header),
sizeof32(struct ack_header)
};
/* Used to remove sysctl values when the module is unloaded. */
static struct ctl_table_header *homa_ctl_header;
static DECLARE_COMPLETION(timer_thread_done);
/**
* homa_load() - invoked when this module is loaded into the Linux kernel
* Return: 0 on success, otherwise a negative errno.
*/
static int __init homa_load(void) {
int status;
printk(KERN_NOTICE "Homa module loading\n");
printk(KERN_NOTICE "Homa structure sizes: data_header %u, "
"data_segment %u, ack %u, "
"grant_header %u, peer %u, ip_hdr %u flowi %u "
"ipv6_hdr %u, flowi6 %u "
"tcp_sock %u homa_rpc %u sk_buff %u\n",
sizeof32(struct data_header),
sizeof32(struct data_segment),
sizeof32(struct homa_ack),
sizeof32(struct grant_header),
sizeof32(struct homa_peer),
sizeof32(struct iphdr),
sizeof32(struct flowi),
sizeof32(struct ipv6hdr),
sizeof32(struct flowi6),
sizeof32(struct tcp_sock),
sizeof32(struct homa_rpc),
sizeof32(struct sk_buff));
status = proto_register(&homa_prot, 1);
if (status != 0) {
printk(KERN_ERR "proto_register failed for homa_prot: %d\n",
status);
goto out;
}
status = proto_register(&homav6_prot, 1);
if (status != 0) {
printk(KERN_ERR "proto_register failed for homav6_prot: %d\n",
status);
goto out;
}
inet_register_protosw(&homa_protosw);
inet6_register_protosw(&homav6_protosw);
status = inet_add_protocol(&homa_protocol, IPPROTO_HOMA);
if (status != 0) {
printk(KERN_ERR "inet_add_protocol failed in homa_load: %d\n",
status);
goto out_cleanup;
}
status = inet6_add_protocol(&homav6_protocol, IPPROTO_HOMA);
if (status != 0) {
printk(KERN_ERR "inet6_add_protocol failed in homa_load: %d\n",
status);
goto out_cleanup;
}
status = homa_init(homa);
if (status)
goto out_cleanup;
metrics_dir_entry = proc_create("homa_metrics", S_IRUGO,
init_net.proc_net, &homa_metrics_pops);
if (!metrics_dir_entry) {
printk(KERN_ERR "couldn't create /proc/net/homa_metrics\n");
status = -ENOMEM;
goto out_cleanup;
}
homa_ctl_header = register_net_sysctl(&init_net, "net/homa",
homa_ctl_table);
if (!homa_ctl_header) {
printk(KERN_ERR "couldn't register Homa sysctl parameters\n");
status = -ENOMEM;
goto out_cleanup;
}
status = homa_offload_init();
if (status != 0) {
printk(KERN_ERR "Homa couldn't init offloads\n");
goto out_cleanup;
}
timer_kthread = kthread_run(homa_timer_main, homa, "homa_timer");
if (IS_ERR(timer_kthread)) {
status = PTR_ERR(timer_kthread);
printk(KERN_ERR "couldn't create homa pacer thread: error %d\n",
status);
timer_kthread = NULL;
goto out_cleanup;
}
tt_init("timetrace", homa->temp);
return 0;
out_cleanup:
homa_offload_end();
unregister_net_sysctl_table(homa_ctl_header);
proc_remove(metrics_dir_entry);
homa_destroy(homa);
inet_del_protocol(&homa_protocol, IPPROTO_HOMA);
inet_unregister_protosw(&homa_protosw);
inet6_del_protocol(&homav6_protocol, IPPROTO_HOMA);
inet6_unregister_protosw(&homav6_protosw);
proto_unregister(&homa_prot);
proto_unregister(&homav6_prot);
out:
return status;
}
/**
* homa_unload() - invoked when this module is unloaded from the Linux kernel.
*/
static void __exit homa_unload(void) {
printk(KERN_NOTICE "Homa module unloading\n");
exiting = true;
tt_destroy();
if (timer_kthread)
wake_up_process(timer_kthread);
if (homa_offload_end() != 0)
printk(KERN_ERR "Homa couldn't stop offloads\n");
wait_for_completion(&timer_thread_done);
unregister_net_sysctl_table(homa_ctl_header);
proc_remove(metrics_dir_entry);
homa_destroy(homa);
inet_del_protocol(&homa_protocol, IPPROTO_HOMA);
inet_unregister_protosw(&homa_protosw);
inet6_del_protocol(&homav6_protocol, IPPROTO_HOMA);
inet6_unregister_protosw(&homav6_protosw);
proto_unregister(&homa_prot);
proto_unregister(&homav6_prot);
}
module_init(homa_load);
module_exit(homa_unload);
/**
* homa_bind() - Implements the bind system call for Homa sockets: associates
* a well-known service port with a socket. Unlike other AF_INET6 protocols,
* there is no need to invoke this system call for sockets that are only
* used as clients.
* @sock: Socket on which the system call was invoked.
* @addr: Contains the desired port number.
* @addr_len: Number of bytes in uaddr.
* Return: 0 on success, otherwise a negative errno.
*/
int homa_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
{
struct homa_sock *hsk = homa_sk(sock->sk);
sockaddr_in_union *addr_in = (sockaddr_in_union *) addr;
int port;
if (unlikely(addr->sa_family != sock->sk->sk_family)) {
return -EAFNOSUPPORT;
}
if (addr_in->in6.sin6_family == AF_INET6) {
if (addr_len < sizeof(struct sockaddr_in6)) {
return -EINVAL;
}
port = ntohs(addr_in->in4.sin_port);
} else if (addr_in->in4.sin_family == AF_INET) {
if (addr_len < sizeof(struct sockaddr_in)) {
return -EINVAL;
}
port = ntohs(addr_in->in6.sin6_port);
}
return homa_sock_bind(&homa->port_map, hsk, port);
}
/**
* homa_close() - Invoked when close system call is invoked on a Homa socket.
* @sk: Socket being closed
* @timeout: ??
*/
void homa_close(struct sock *sk, long timeout) {
struct homa_sock *hsk = homa_sk(sk);
homa_sock_destroy(hsk);
sk_common_release(sk);
tt_record1("closed socket, port %d\n", hsk->port);
if (hsk->homa->freeze_type == SOCKET_CLOSE)
tt_freeze();
}
/**
* homa_shutdown() - Implements the shutdown system call for Homa sockets.
* @sk: Socket to shut down.
* @how: Ignored: for other sockets, can independently shut down
* sending and receiving, but for Homa any shutdown will
* shut down everything.
*
* Return: 0 on success, otherwise a negative errno.
*/
int homa_shutdown(struct socket *sock, int how)
{
homa_sock_shutdown(homa_sk(sock->sk));
return 0;
}
/**
* homa_disconnect() - Invoked when disconnect system call is invoked on a
* Homa socket.
* @sk: Socket to disconnect
* @flags: ??
*
* Return: 0 on success, otherwise a negative errno.
*/
int homa_disconnect(struct sock *sk, int flags) {
printk(KERN_WARNING "unimplemented disconnect invoked on Homa socket\n");
return -ENOSYS;
}
/**
* homa_ioc_recv() - The top-level function for the ioctl that implements
* the homa_recv user-level API.
* @sk: Socket for this request.
* @arg: Used to pass information from/to user space.
*
* Return: 0 on success, otherwise a negative errno.
*/
int homa_ioc_recv(struct sock *sk, unsigned long arg) {
struct homa_sock *hsk = homa_sk(sk);
struct homa_recv_args args;
struct iovec iovstack[UIO_FASTIOV];
// Must be freed at the end of this function.
struct iovec *iov = NULL;
struct iov_iter iter;
int err;
int result;
struct homa_rpc *rpc = NULL;
if (unlikely(copy_from_user(&args, (void *) arg, sizeof(args))))
return -EFAULT;
if ((args.message_buf && args.iovec)
|| (args.flags & ~HOMA_RECV_VALID_FLAGS)
|| args._pad[0]
|| args._pad[1]
|| args._pad[2]
|| args._pad[3]
|| args._pad[4]
|| args._pad[5]
|| args._pad[6]) {
return -EINVAL;
}
tt_record3("homa_ioc_recv starting, port %d, pid %d, flags %d",
hsk->port, current->pid, args.flags);
if (args.message_buf != NULL) {
err = import_single_range(READ, args.message_buf, args.length,
iovstack, &iter);
} else {
iov = iovstack;
err = import_iovec(READ, args.iovec, args.length,
ARRAY_SIZE(iovstack), &iov, &iter);
}
if (unlikely(err < 0))
goto error;
if (unlikely(args.id && args.source_addr.in6.sin6_family &&
args.source_addr.sa.sa_family != sk->sk_family)) {
err = -EAFNOSUPPORT;
goto error;
}
rpc = homa_wait_for_message(hsk, args.flags, args.id,
&args.source_addr);
if (IS_ERR(rpc)) {
err = PTR_ERR(rpc);
rpc = NULL;
goto error;
}
/* Generate time traces on both ends for long elapsed times (used
* for performance debugging).
*/
if (rpc->hsk->homa->freeze_type == SLOW_RPC) {
uint64_t elapsed = (get_cycles() - rpc->start_cycles)>>10;
if ((elapsed <= hsk->homa->temp[1])
&& (elapsed >= hsk->homa->temp[0])
&& homa_is_client(rpc->id)
&& (rpc->msgin.total_length < 500)) {
tt_record4("Long RTT: kcycles %d, id %d, peer 0x%x, "
"length %d",
elapsed, rpc->id,
tt_addr(rpc->peer->addr),
rpc->msgin.total_length);
homa_freeze(rpc, SLOW_RPC, "Freezing because of long "
"elapsed time for RPC id %d, peer 0x%x");
}
}
if (rpc->hsk->homa->sync_freeze) {
rpc->hsk->homa->sync_freeze = 0;
if (!tt_frozen) {
struct freeze_header freeze;
tt_record2("Freezing timetrace because of "
"sync_freeze, id %d, peer 0x%x",
rpc->id, tt_addr(rpc->peer->addr));
tt_freeze();
homa_xmit_control(FREEZE, &freeze, sizeof(freeze), rpc);
}
}
/* Must release the RPC lock (and potentially free the RPC) before
* copying to user space (see sync.txt). Mark the RPC so we can
* still access the RPC even without holding its lock.
*/
rpc->dont_reap = true;
if (homa_is_client(rpc->id)) {
if ((args.length >= rpc->msgin.total_length) || rpc->error
|| !(args.flags & HOMA_RECV_PARTIAL))
homa_rpc_free(rpc);
} else {
rpc->state = RPC_IN_SERVICE;
}
homa_rpc_unlock(rpc);
args.length = (rpc->msgin.total_length >= 0) ? rpc->msgin.total_length
: 0;
memset(&args.source_addr, 0, sizeof(args.source_addr));
if (sk->sk_family == AF_INET6) {
args.source_addr.in6.sin6_family = AF_INET6;
args.source_addr.in6.sin6_port = htons(rpc->dport);
args.source_addr.in6.sin6_addr = rpc->peer->addr;
} else {
args.source_addr.in4.sin_family = AF_INET;
args.source_addr.in4.sin_port = htons(rpc->dport);
args.source_addr.in4.sin_addr.s_addr = ipv6_to_ipv4(
rpc->peer->addr);
}
args.id = rpc->id;
args.completion_cookie = rpc->completion_cookie;
if (unlikely(copy_to_user((void *) arg, &args, sizeof(args)))) {
err = -EFAULT;
printk(KERN_NOTICE "homa_ioc_recv couldn't copy back args\n");
goto error;
}
if (rpc->error) {
err = rpc->error;
goto error;
}
tt_record2("starting data copy to user space for id %d, length %d",
rpc->id, rpc->msgin.total_length);
result = homa_message_in_copy_data(&rpc->msgin, &iter, iter.count);
tt_record4("homa_ioc_recv finished, id %u, peer 0x%x, length %d, pid %d",
rpc->id & 0xffffffff, tt_addr(rpc->peer->addr),
result, current->pid);
rpc->dont_reap = false;
kfree(iov);
return result;
error:
tt_record2("homa_ioc_recv error %d, id %d", err, args.id);
if (rpc != NULL) {
rpc->dont_reap = false;
}
kfree(iov);
return err;
}
/**
* homa_ioc_reply() - The top-level function for the ioctl that implements
* the homa_reply user-level API.
* @sk: Socket for this request.
* @arg: Used to pass information from/to user space.
*
* Return: 0 on success, otherwise a negative errno.
*/
int homa_ioc_reply(struct sock *sk, unsigned long arg) {
struct homa_sock *hsk = homa_sk(sk);
struct homa_reply_args args;
struct iovec iovstack[UIO_FASTIOV];
// Must be freed at the end of this function.
struct iovec *iov = NULL;
struct iov_iter iter;
int err = 0;
struct homa_rpc *srpc;
struct homa_peer *peer;
struct sk_buff *skbs;
size_t length;
struct in6_addr canonical_dest;
if (unlikely(copy_from_user(&args, (void *) arg, sizeof(args)))) {
err = -EFAULT;
goto done;
}
if ((args.message_buf && args.iovec)
|| args._pad1
|| args._pad2[0]
|| args._pad2[1]
|| args._pad2[2]
|| args._pad2[3]
|| args._pad2[4]
|| args._pad2[5]
|| args._pad2[6]) {
return -EINVAL;
}
tt_record3("homa_ioc_reply starting, id %llu, port %d, pid %d",
args.id, hsk->port, current->pid);
// err = audit_sockaddr(sizeof(args.dest_addr), &args.dest_addr);
// if (unlikely(err))
// return err;
canonical_dest = canonical_ipv6_addr(&args.dest_addr);
if (unlikely(args.dest_addr.in6.sin6_family &&
args.dest_addr.in6.sin6_family != sk->sk_family)) {
err = -EAFNOSUPPORT;
goto done;
}
if (args.message_buf != NULL) {
err = import_single_range(WRITE, args.message_buf, args.length,
iovstack, &iter);
} else {
iov = iovstack;
err = import_iovec(WRITE, args.iovec, args.length,
ARRAY_SIZE(iovstack), &iov, &iter);
}
if (err < 0)
goto done;
err = 0;
length = iter.count;
peer = homa_peer_find(&hsk->homa->peers, &canonical_dest, &hsk->inet);
if (IS_ERR(peer)) {
err = PTR_ERR(peer);
goto done;
}
skbs = homa_fill_packets(hsk, peer, &iter);
if (IS_ERR(skbs)) {
err = PTR_ERR(skbs);
goto done;
}
tt_record2("data copied into response message for id %d, length %d",
args.id, args.length);
srpc = homa_find_server_rpc(hsk, &canonical_dest,
ntohs(args.dest_addr.in6.sin6_port), args.id);
if (!srpc) {
homa_free_skbs(skbs);
err = -EINVAL;
goto done;
}
if (srpc->state != RPC_IN_SERVICE) {
err = -EINVAL;
goto unlock;
}
srpc->state = RPC_OUTGOING;
homa_message_out_init(srpc, hsk->port, skbs, length);
tt_record1("homa_ioc_reply calling homa_xmit_data for id %u",
srpc->id);
homa_xmit_data(srpc, false);
unlock:
homa_rpc_unlock(srpc);
done:
// tt_record3("homa_ioc_reply finished, id %llu, port %d, length %d",
// args.id, hsk->client_port, args.length);
kfree(iov);
return err;
}
/**
* homa_ioc_send() - The top-level function for the ioctl that implements
* the homa_send user-level API.
* @sk: Socket for this request.
* @arg: Used to pass information from/to user space.
*
* Return: 0 on success, otherwise a negative errno.
*/
int homa_ioc_send(struct sock *sk, unsigned long arg) {
struct homa_sock *hsk = homa_sk(sk);
struct homa_send_args args;
struct iovec iovstack[UIO_FASTIOV];
// Must be freed at the end of this function.
struct iovec *iov = NULL;
struct iov_iter iter;
int err;
struct homa_rpc *crpc = NULL;
if (unlikely(copy_from_user(&args, (void *) arg, sizeof(args)))) {
err = -EFAULT;
goto error;
}
if ((args.message_buf && args.iovec)
|| args._pad1
|| args._pad2[0]
|| args._pad2[1]
|| args._pad2[2]
|| args._pad2[3]
|| args._pad2[4]
|| args._pad2[5]
|| args._pad2[6]) {
return -EINVAL;
}
// err = audit_sockaddr(sizeof(args.dest_addr), &args.dest_addr);
// if (unlikely(err))
// return err;
tt_record3("homa_ioc_send starting, target 0x%x:%d, id %u",
(args.dest_addr.in6.sin6_family == AF_INET)
? ntohl(args.dest_addr.in4.sin_addr.s_addr)
: tt_addr(args.dest_addr.in6.sin6_addr),
ntohs(args.dest_addr.in6.sin6_port),
atomic64_read(&hsk->homa->next_outgoing_id));
if (unlikely(args.dest_addr.in6.sin6_family &&
args.dest_addr.in6.sin6_family != sk->sk_family)) {
err = -EAFNOSUPPORT;
goto error;
}
if (args.message_buf != NULL) {
err = import_single_range(WRITE, args.message_buf, args.length,
iovstack, &iter);
} else {
iov = iovstack;
err = import_iovec(WRITE, args.iovec, args.length,
ARRAY_SIZE(iovstack), &iov, &iter);
}
if (err < 0)
goto error;
err = 0;
crpc = homa_rpc_new_client(hsk, &args.dest_addr, &iter);
if (IS_ERR(crpc)) {
err = PTR_ERR(crpc);
crpc = NULL;
goto error;
}