int
efab_eplock_unlock_and_wake(ci_netif *ni, int in_dl_context)
{
int l = ni->state->lock.lock;
tcp_helper_resource_t *rs = netif2tcp_helper_resource(ni);
/* Allocate more packets if necessary. */
if( !in_dl_context && OO_STACK_NEEDS_MORE_PACKETS(ni) )
efab_tcp_helper_more_bufs(rs);
/* We use in_dl_context from now on, and we should remove
* CI_NETIF_FLAG_IN_DL_CONTEXT under the stack lock. */
if( in_dl_context )
ni->flags &= ~CI_NETIF_FLAG_IN_DL_CONTEXT;
again:
#ifndef NDEBUG
if( (~l & CI_EPLOCK_LOCKED) || (l & CI_EPLOCK_UNLOCKED) ) {
OO_DEBUG_ERR(ci_log("efab_eplock_unlock_and_wake: corrupt"
" (value is %x)", (unsigned) l));
OO_DEBUG_ERR(dump_stack());
return -EIO;
}
#endif
if( l & CI_EPLOCK_CALLBACK_FLAGS ) {
/* Invoke the callback while we've still got the lock. The callback
** is responsible for either
** - dropping the lock using ef_eplock_try_unlock(), and returning
** the lock value prior to unlocking, OR
** - keeping the eplock locked and returning CI_EPLOCK_LOCKED
*/
l = efab_tcp_helper_netif_lock_callback(&ni->eplock_helper, l, in_dl_context);
}
else if( ci_cas32_fail(&ni->state->lock.lock, l, CI_EPLOCK_UNLOCKED) ) {
/* Someone (probably) set a flag when we tried to unlock, so we'd
** better handle the flag(s).
*/
l = ni->state->lock.lock;
goto again;
}
if( l & CI_EPLOCK_FL_NEED_WAKE ) {
CITP_STATS_NETIF_INC(ni, lock_wakes);
wake_up_interruptible(&ni->eplock_helper.wq);
}
return 0;
}
static int
efab_tcp_helper_stack_attach(ci_private_t* priv, void *arg)
{
oo_stack_attach_t* op = arg;
tcp_helper_resource_t* trs = priv->thr;
int rc;
if( trs == NULL ) {
LOG_E(ci_log("%s: ERROR: not attached to a stack", __FUNCTION__));
return -EINVAL;
}
OO_DEBUG_TCPH(ci_log("%s: [%d]", __FUNCTION__, NI_ID(&trs->netif)));
rc = oo_create_stack_fd(trs);
if( rc < 0 ) {
OO_DEBUG_ERR(ci_log("%s: oo_create_stack_fd failed (%d)",
__FUNCTION__, rc));
return rc;
}
op->fd = rc;
/* Re-read the OS socket buffer size settings. This ensures we'll use
* up-to-date values for this new socket.
*/
efab_get_os_settings(&NI_OPTS_TRS(trs));
op->out_nic_set = trs->netif.nic_set;
op->out_map_size = trs->mem_mmap_bytes;
return 0;
}
int
oo_create_stack_fd(tcp_helper_resource_t *thr)
{
int fd;
efab_thr_ref(thr);
fd = onload_alloc_file(thr, OO_SP_NULL, O_CLOEXEC, CI_PRIV_TYPE_NETIF);
if( fd < 0 ) {
efab_thr_release(thr);
OO_DEBUG_ERR(ci_log("%s: onload_alloc_file failed (%d)", __FUNCTION__, fd));
return fd;
}
return fd;
}
static int
efab_tcp_helper_move_state(ci_private_t* priv, void *arg)
{
oo_tcp_move_state_t *op = arg;
tcp_helper_endpoint_t *new_ep;
tcp_helper_resource_t * new_trs = NULL;
ci_netif* ni, *new_ni;
ci_tcp_state * ts, *new_ts;
tcp_helper_endpoint_t* ep;
int rc = efab_ioctl_get_ep(priv, op->ep_id, &ep);
if (rc != 0)
return rc;
OO_DEBUG_TCPH(ci_log("%s: (trs=%p (%u), priv=%p, ep_id=%u, new_trs_id=%u, "
"new_ep_id=%u", __FUNCTION__, priv->thr, priv->thr->id,
priv, OO_SP_FMT(op->ep_id), op->new_trs_id,
OO_SP_FMT(op->new_ep_id)));
do {
/* check that the existing id is valid */
ni = &priv->thr->netif;
ts = SP_TO_TCP(ni, ep->id);
/* TODO: check this endpoint belongs to the tcp helper resource of priv and not
* somewhere else */
/* this function does not change fd_type or fd ops, so it is not able
* to cope with changing the socket type. We think this only makes sense
* for TCP, so assert we are taking a TCP endpoint.
*/
ci_assert_equal(ts->s.pkt.ip.ip_protocol, IPPROTO_TCP);
ci_assert_equal(priv->fd_type, CI_PRIV_TYPE_TCP_EP);
/* get pointer to resource from handle - increments ref count */
rc = efab_thr_table_lookup(NULL, op->new_trs_id,
EFAB_THR_TABLE_LOOKUP_CHECK_USER, &new_trs);
if (rc < 0) {
OO_DEBUG_ERR( ci_log("%s: invalid new resource handle", __FUNCTION__) );
break;
}
ci_assert(new_trs != NULL);
/* check valid endpoint in new netif */
new_ni = &new_trs->netif;
new_ep = ci_netif_get_valid_ep(new_ni, op->new_ep_id);
new_ts = SP_TO_TCP(new_ni, new_ep->id);
/* check the two endpoint states look valid */
if( (ts->s.pkt.ip.ip_protocol != new_ts->s.pkt.ip.ip_protocol) ||
(ts->s.b.state != CI_TCP_CLOSED) ||
(ep->oofilter.sf_local_port != NULL) ) {
efab_thr_release(new_trs);
rc = -EINVAL;
OO_DEBUG_ERR(ci_log("%s: invalid endpoint states", __FUNCTION__));
break;
}
/* should be fine to complete */
ci_assert(new_trs);
{
tcp_helper_resource_t *old_trs;
again:
old_trs = priv->thr;
if (ci_cas_uintptr_fail((ci_uintptr_t *)&priv->thr,
(ci_uintptr_t)old_trs, (ci_uintptr_t)new_trs))
goto again;
efab_thr_release(old_trs);
}
/* move file to hold details of new resource, new endpoint */
ci_assert(OO_SP_EQ(priv->sock_id, op->ep_id));
priv->sock_id = new_ep->id;
OO_DEBUG_TCPH(ci_log("%s: set epid %u", __FUNCTION__,
OO_SP_FMT(priv->sock_id)));
/* copy across any necessary state */
ci_assert_equal(new_ep->os_socket, NULL);
new_ep->os_socket = ep->os_socket;
ep->os_socket = NULL;
/* set ORPHAN flag in current as not attached to an FD */
ci_bit_set(&ts->s.b.sb_aflags, CI_SB_AFLAG_ORPHAN_BIT);
/* remove ORPHAN flag in new TCP state */
ci_atomic32_and(&new_ts->s.b.sb_aflags,
~(CI_SB_AFLAG_ORPHAN | CI_SB_AFLAG_TCP_IN_ACCEPTQ));
return 0;
} while (0);
return rc;
}
static int
onload_alloc_file(tcp_helper_resource_t *thr, oo_sp ep_id, int flags,
int fd_type)
{
struct qstr name = { .name = "" };
#ifdef EFX_HAVE_STRUCT_PATH
struct path path;
#define my_dentry path.dentry
#else
struct dentry *dentry;
#define my_dentry dentry
#endif
struct file *file;
int fd;
struct inode *inode;
ci_private_t *priv;
struct file_operations *fops;
fops = oo_fops_by_type(fd_type);
if( fops == NULL )
return -EINVAL;
ci_assert_equal(fops->owner, THIS_MODULE);
inode = new_inode(onload_mnt->mnt_sb);
if( inode == NULL )
return -ENOMEM;
#ifdef EFX_FSTYPE_HAS_MOUNT
inode->i_ino = get_next_ino();
#endif
if( fd_type == CI_PRIV_TYPE_NETIF )
inode->i_mode = S_IRWXUGO;
if( fd_type == CI_PRIV_TYPE_TCP_EP || fd_type == CI_PRIV_TYPE_UDP_EP )
inode->i_mode =
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21)
/* in 2.6.18 this flag makes us "socket" and sendmsg crashes;
* see sock_from_file() */
S_IFSOCK |
#endif
S_IRWXUGO;
else
inode->i_mode = S_IFIFO | S_IRUSR | S_IWUSR;
inode->i_uid = current_fsuid();
inode->i_gid = current_fsgid();
priv = &container_of(inode, struct onload_inode, vfs_inode)->priv;
priv->thr = thr;
priv->sock_id = ep_id;
priv->fd_type = fd_type;
fd = get_unused_fd();
if( fd < 0 ) {
iput(inode);
return fd;
}
/*ci_log("[%d]%s(%d:%d) return %d priv=%p", current->pid, __func__,
thr->id, ep_id, fd, priv);*/
#ifdef EFX_FSTYPE_HAS_MOUNT
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,37)
path.dentry = d_alloc(onload_mnt->mnt_sb->s_root, &name);
if( path.dentry != NULL )
path.dentry->d_op = &onloadfs_dentry_operations;
#else
path.dentry = d_alloc_pseudo(onload_mnt->mnt_sb, &name);
#endif
#else /* EFX_FSTYPE_HAS_MOUNT */
#ifdef EFX_HAVE_D_DNAME
my_dentry = d_alloc(onload_mnt->mnt_sb->s_root, &name);
#else
{
char str[32];
name.len = onloadfs_name(&container_of(inode, struct onload_inode,
vfs_inode)->priv,
str, sizeof(str));
name.name = str;
name.hash = inode->i_ino;
my_dentry = d_alloc(onload_mnt->mnt_sb->s_root, &name);
}
#endif
#endif /* EFX_FSTYPE_HAS_MOUNT */
if( my_dentry == NULL ) {
put_unused_fd(fd);
iput(inode);
return -ENOMEM;
}
#if !defined(EFX_FSTYPE_HAS_MOUNT) || defined(EFX_OLD_MOUNT_PSEUDO)
my_dentry->d_op = &onloadfs_dentry_operations;
#if !defined(EFX_HAVE_STRUCT_PATH) && defined(EFX_HAVE_D_DNAME)
my_dentry->d_flags &= ~DCACHE_UNHASHED;
#endif
#endif
d_instantiate(my_dentry, inode);
#ifndef EFX_HAVE_D_DNAME
d_rehash(my_dentry);
#endif
inode->i_fop = fops;
#ifdef EFX_HAVE_STRUCT_PATH
path.mnt = mntget(onload_mnt);
file = alloc_file(&path, FMODE_READ | FMODE_WRITE, fops);
#else
file = alloc_file(onload_mnt, dentry, FMODE_READ | FMODE_WRITE, fops);
#endif
if( file == NULL) {
#ifdef EFX_HAVE_STRUCT_PATH
path_put(&path);
#else
dput(dentry);
iput(inode);
#endif
put_unused_fd(fd);
return -ENFILE;
}
priv->_filp = file;
file->f_flags = O_RDWR | (flags & O_NONBLOCK);
file->f_pos = 0;
file->private_data = priv;
if( flags & O_CLOEXEC ) {
struct files_struct *files = current->files;
struct fdtable *fdt;
spin_lock(&files->file_lock);
fdt = files_fdtable(files);
rcu_assign_pointer(fdt->fd[fd], file);
efx_set_close_on_exec(fd, fdt);
spin_unlock(&files->file_lock);
} else
fd_install(fd, file);
try_module_get(THIS_MODULE);
ci_assert_equal(file->f_op, fops);
return fd;
}
void onload_priv_free(ci_private_t *priv)
{
if( priv->_filp->f_vfsmnt != onload_mnt)
ci_free(priv);
/* inode will free the priv automatically */
}
int
oo_create_fd(tcp_helper_endpoint_t* ep, int flags, int fd_type)
{
int fd;
tcp_helper_resource_t *trs = ep->thr;
citp_waitable_obj *wo = SP_TO_WAITABLE_OBJ(&trs->netif, ep->id);
efab_thr_ref(trs);
fd = onload_alloc_file(trs, ep->id, flags, fd_type);
if( fd < 0 ) {
efab_thr_release(trs);
OO_DEBUG_ERR(ci_log("%s: onload_alloc_file failed (%d)", __FUNCTION__, fd));
return fd;
}
ci_atomic32_and(&wo-> waitable.sb_aflags,
~(CI_SB_AFLAG_ORPHAN | CI_SB_AFLAG_TCP_IN_ACCEPTQ));
return fd;
}
