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-rw-r--r--net/9p/Kconfig9
-rw-r--r--net/9p/Makefile4
-rw-r--r--net/9p/client.c109
-rw-r--r--net/9p/error.c21
-rw-r--r--net/9p/trans_fd.c74
-rw-r--r--net/9p/trans_usbg.c956
-rw-r--r--net/9p/trans_virtio.c1
-rw-r--r--net/9p/trans_xen.c9
8 files changed, 1107 insertions, 76 deletions
diff --git a/net/9p/Kconfig b/net/9p/Kconfig
index 00ebce9e5a65..22f8c167845d 100644
--- a/net/9p/Kconfig
+++ b/net/9p/Kconfig
@@ -5,6 +5,7 @@
menuconfig NET_9P
tristate "Plan 9 Resource Sharing Support (9P2000)"
+ select NETFS_SUPPORT
help
If you say Y here, you will get experimental support for
Plan 9 resource sharing via the 9P2000 protocol.
@@ -39,6 +40,14 @@ config NET_9P_XEN
This builds support for a transport for 9pfs between
two Xen domains.
+config NET_9P_USBG
+ tristate "9P USB Gadget Transport"
+ depends on USB_GADGET
+ select CONFIGFS_FS
+ select USB_LIBCOMPOSITE
+ help
+ This builds support for a transport for 9pfs over
+ usb gadget.
config NET_9P_RDMA
depends on INET && INFINIBAND && INFINIBAND_ADDR_TRANS
diff --git a/net/9p/Makefile b/net/9p/Makefile
index 1df9b344c30b..22794a451c3f 100644
--- a/net/9p/Makefile
+++ b/net/9p/Makefile
@@ -4,6 +4,7 @@ obj-$(CONFIG_NET_9P_FD) += 9pnet_fd.o
obj-$(CONFIG_NET_9P_XEN) += 9pnet_xen.o
obj-$(CONFIG_NET_9P_VIRTIO) += 9pnet_virtio.o
obj-$(CONFIG_NET_9P_RDMA) += 9pnet_rdma.o
+obj-$(CONFIG_NET_9P_USBG) += 9pnet_usbg.o
9pnet-objs := \
mod.o \
@@ -23,3 +24,6 @@ obj-$(CONFIG_NET_9P_RDMA) += 9pnet_rdma.o
9pnet_rdma-objs := \
trans_rdma.o \
+
+9pnet_usbg-objs := \
+ trans_usbg.o \
diff --git a/net/9p/client.c b/net/9p/client.c
index e265a0ca6bdd..5c1ca57ccd28 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -18,6 +18,7 @@
#include <linux/sched/signal.h>
#include <linux/uaccess.h>
#include <linux/uio.h>
+#include <linux/netfs.h>
#include <net/9p/9p.h>
#include <linux/parser.h>
#include <linux/seq_file.h>
@@ -235,6 +236,8 @@ static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc,
if (!fc->sdata)
return -ENOMEM;
fc->capacity = alloc_msize;
+ fc->id = 0;
+ fc->tag = P9_NOTAG;
return 0;
}
@@ -974,8 +977,10 @@ error:
struct p9_client *p9_client_create(const char *dev_name, char *options)
{
int err;
+ static atomic_t seqno = ATOMIC_INIT(0);
struct p9_client *clnt;
char *client_id;
+ char *cache_name;
clnt = kmalloc(sizeof(*clnt), GFP_KERNEL);
if (!clnt)
@@ -1032,15 +1037,23 @@ struct p9_client *p9_client_create(const char *dev_name, char *options)
if (err)
goto close_trans;
+ cache_name = kasprintf(GFP_KERNEL,
+ "9p-fcall-cache-%u", atomic_inc_return(&seqno));
+ if (!cache_name) {
+ err = -ENOMEM;
+ goto close_trans;
+ }
+
/* P9_HDRSZ + 4 is the smallest packet header we can have that is
* followed by data accessed from userspace by read
*/
clnt->fcall_cache =
- kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize,
+ kmem_cache_create_usercopy(cache_name, clnt->msize,
0, 0, P9_HDRSZ + 4,
clnt->msize - (P9_HDRSZ + 4),
NULL);
+ kfree(cache_name);
return clnt;
close_trans:
@@ -1535,7 +1548,8 @@ p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to,
struct p9_client *clnt = fid->clnt;
struct p9_req_t *req;
int count = iov_iter_count(to);
- int rsize, received, non_zc = 0;
+ u32 rsize, received;
+ bool non_zc = false;
char *dataptr;
*err = 0;
@@ -1558,7 +1572,7 @@ p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to,
0, 11, "dqd", fid->fid,
offset, rsize);
} else {
- non_zc = 1;
+ non_zc = true;
req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
rsize);
}
@@ -1579,11 +1593,13 @@ p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to,
return 0;
}
if (rsize < received) {
- pr_err("bogus RREAD count (%d > %d)\n", received, rsize);
- received = rsize;
+ pr_err("bogus RREAD count (%u > %u)\n", received, rsize);
+ *err = -EIO;
+ p9_req_put(clnt, req);
+ return 0;
}
- p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
+ p9_debug(P9_DEBUG_9P, "<<< RREAD count %u\n", received);
if (non_zc) {
int n = copy_to_iter(dataptr, received, to);
@@ -1609,13 +1625,10 @@ p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
int total = 0;
*err = 0;
- p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
- fid->fid, offset, iov_iter_count(from));
-
while (iov_iter_count(from)) {
- int count = iov_iter_count(from);
- int rsize = fid->iounit;
- int written;
+ size_t count = iov_iter_count(from);
+ u32 rsize = fid->iounit;
+ u32 written;
if (!rsize || rsize > clnt->msize - P9_IOHDRSZ)
rsize = clnt->msize - P9_IOHDRSZ;
@@ -1623,6 +1636,9 @@ p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
if (count < rsize)
rsize = count;
+ p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %u (/%zu)\n",
+ fid->fid, offset, rsize, count);
+
/* Don't bother zerocopy for small IO (< 1024) */
if (clnt->trans_mod->zc_request && rsize > 1024) {
req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
@@ -1646,11 +1662,14 @@ p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
break;
}
if (rsize < written) {
- pr_err("bogus RWRITE count (%d > %d)\n", written, rsize);
- written = rsize;
+ pr_err("bogus RWRITE count (%u > %u)\n", written, rsize);
+ *err = -EIO;
+ iov_iter_revert(from, count - iov_iter_count(from));
+ p9_req_put(clnt, req);
+ break;
}
- p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
+ p9_debug(P9_DEBUG_9P, "<<< RWRITE count %u\n", written);
p9_req_put(clnt, req);
iov_iter_revert(from, count - written - iov_iter_count(from));
@@ -1661,6 +1680,54 @@ p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
}
EXPORT_SYMBOL(p9_client_write);
+void
+p9_client_write_subreq(struct netfs_io_subrequest *subreq)
+{
+ struct netfs_io_request *wreq = subreq->rreq;
+ struct p9_fid *fid = wreq->netfs_priv;
+ struct p9_client *clnt = fid->clnt;
+ struct p9_req_t *req;
+ unsigned long long start = subreq->start + subreq->transferred;
+ int written, len = subreq->len - subreq->transferred;
+ int err;
+
+ p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu len %d\n",
+ fid->fid, start, len);
+
+ /* Don't bother zerocopy for small IO (< 1024) */
+ if (clnt->trans_mod->zc_request && len > 1024) {
+ req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, &subreq->io_iter,
+ 0, wreq->len, P9_ZC_HDR_SZ, "dqd",
+ fid->fid, start, len);
+ } else {
+ req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
+ start, len, &subreq->io_iter);
+ }
+ if (IS_ERR(req)) {
+ netfs_write_subrequest_terminated(subreq, PTR_ERR(req));
+ return;
+ }
+
+ err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written);
+ if (err) {
+ trace_9p_protocol_dump(clnt, &req->rc);
+ p9_req_put(clnt, req);
+ netfs_write_subrequest_terminated(subreq, err);
+ return;
+ }
+
+ if (written > len) {
+ pr_err("bogus RWRITE count (%d > %u)\n", written, len);
+ written = -EIO;
+ }
+
+ p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", len);
+
+ p9_req_put(clnt, req);
+ netfs_write_subrequest_terminated(subreq, written);
+}
+EXPORT_SYMBOL(p9_client_write_subreq);
+
struct p9_wstat *p9_client_stat(struct p9_fid *fid)
{
int err;
@@ -2037,7 +2104,8 @@ EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
{
- int err, rsize, non_zc = 0;
+ int err, non_zc = 0;
+ u32 rsize;
struct p9_client *clnt;
struct p9_req_t *req;
char *dataptr;
@@ -2046,7 +2114,7 @@ int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
iov_iter_kvec(&to, ITER_DEST, &kv, 1, count);
- p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
+ p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %u\n",
fid->fid, offset, count);
clnt = fid->clnt;
@@ -2081,11 +2149,12 @@ int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
goto free_and_error;
}
if (rsize < count) {
- pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
- count = rsize;
+ pr_err("bogus RREADDIR count (%u > %u)\n", count, rsize);
+ err = -EIO;
+ goto free_and_error;
}
- p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
+ p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %u\n", count);
if (non_zc)
memmove(data, dataptr, count);
diff --git a/net/9p/error.c b/net/9p/error.c
index 8da744494b68..8ba8afc91482 100644
--- a/net/9p/error.c
+++ b/net/9p/error.c
@@ -16,6 +16,7 @@
#include <linux/list.h>
#include <linux/jhash.h>
#include <linux/errno.h>
+#include <linux/hashtable.h>
#include <net/9p/9p.h>
/**
@@ -33,8 +34,8 @@ struct errormap {
struct hlist_node list;
};
-#define ERRHASHSZ 32
-static struct hlist_head hash_errmap[ERRHASHSZ];
+#define ERRHASH_BITS 5
+static DEFINE_HASHTABLE(hash_errmap, ERRHASH_BITS);
/* FixMe - reduce to a reasonable size */
static struct errormap errmap[] = {
@@ -176,18 +177,14 @@ static struct errormap errmap[] = {
int p9_error_init(void)
{
struct errormap *c;
- int bucket;
-
- /* initialize hash table */
- for (bucket = 0; bucket < ERRHASHSZ; bucket++)
- INIT_HLIST_HEAD(&hash_errmap[bucket]);
+ u32 hash;
/* load initial error map into hash table */
for (c = errmap; c->name; c++) {
c->namelen = strlen(c->name);
- bucket = jhash(c->name, c->namelen, 0) % ERRHASHSZ;
+ hash = jhash(c->name, c->namelen, 0);
INIT_HLIST_NODE(&c->list);
- hlist_add_head(&c->list, &hash_errmap[bucket]);
+ hash_add(hash_errmap, &c->list, hash);
}
return 1;
@@ -205,12 +202,12 @@ int p9_errstr2errno(char *errstr, int len)
{
int errno;
struct errormap *c;
- int bucket;
+ u32 hash;
errno = 0;
c = NULL;
- bucket = jhash(errstr, len, 0) % ERRHASHSZ;
- hlist_for_each_entry(c, &hash_errmap[bucket], list) {
+ hash = jhash(errstr, len, 0);
+ hash_for_each_possible(hash_errmap, c, list, hash) {
if (c->namelen == len && !memcmp(c->name, errstr, len)) {
errno = c->val;
break;
diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index 1a3948b8c493..339ec4e54778 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -11,6 +11,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/in.h>
+#include <linux/in6.h>
#include <linux/module.h>
#include <linux/net.h>
#include <linux/ipv6.h>
@@ -95,7 +96,6 @@ struct p9_poll_wait {
* @unsent_req_list: accounting for requests that haven't been sent
* @rreq: read request
* @wreq: write request
- * @req: current request being processed (if any)
* @tmp_buf: temporary buffer to read in header
* @rc: temporary fcall for reading current frame
* @wpos: write position for current frame
@@ -192,12 +192,13 @@ static void p9_conn_cancel(struct p9_conn *m, int err)
spin_lock(&m->req_lock);
- if (m->err) {
+ if (READ_ONCE(m->err)) {
spin_unlock(&m->req_lock);
return;
}
- m->err = err;
+ WRITE_ONCE(m->err, err);
+ ASSERT_EXCLUSIVE_WRITER(m->err);
list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
list_move(&req->req_list, &cancel_list);
@@ -284,7 +285,7 @@ static void p9_read_work(struct work_struct *work)
m = container_of(work, struct p9_conn, rq);
- if (m->err < 0)
+ if (READ_ONCE(m->err) < 0)
return;
p9_debug(P9_DEBUG_TRANS, "start mux %p pos %zd\n", m, m->rc.offset);
@@ -451,7 +452,7 @@ static void p9_write_work(struct work_struct *work)
m = container_of(work, struct p9_conn, wq);
- if (m->err < 0) {
+ if (READ_ONCE(m->err) < 0) {
clear_bit(Wworksched, &m->wsched);
return;
}
@@ -623,7 +624,7 @@ static void p9_poll_mux(struct p9_conn *m)
__poll_t n;
int err = -ECONNRESET;
- if (m->err < 0)
+ if (READ_ONCE(m->err) < 0)
return;
n = p9_fd_poll(m->client, NULL, &err);
@@ -666,6 +667,7 @@ static void p9_poll_mux(struct p9_conn *m)
static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
{
__poll_t n;
+ int err;
struct p9_trans_fd *ts = client->trans;
struct p9_conn *m = &ts->conn;
@@ -674,9 +676,10 @@ static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
spin_lock(&m->req_lock);
- if (m->err < 0) {
+ err = READ_ONCE(m->err);
+ if (err < 0) {
spin_unlock(&m->req_lock);
- return m->err;
+ return err;
}
WRITE_ONCE(req->status, REQ_STATUS_UNSENT);
@@ -955,64 +958,55 @@ static void p9_fd_close(struct p9_client *client)
kfree(ts);
}
-/*
- * stolen from NFS - maybe should be made a generic function?
- */
-static inline int valid_ipaddr4(const char *buf)
-{
- int rc, count, in[4];
-
- rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
- if (rc != 4)
- return -EINVAL;
- for (count = 0; count < 4; count++) {
- if (in[count] > 255)
- return -EINVAL;
- }
- return 0;
-}
-
static int p9_bind_privport(struct socket *sock)
{
- struct sockaddr_in cl;
+ struct sockaddr_storage stor = { 0 };
int port, err = -EINVAL;
- memset(&cl, 0, sizeof(cl));
- cl.sin_family = AF_INET;
- cl.sin_addr.s_addr = htonl(INADDR_ANY);
+ stor.ss_family = sock->ops->family;
+ if (stor.ss_family == AF_INET)
+ ((struct sockaddr_in *)&stor)->sin_addr.s_addr = htonl(INADDR_ANY);
+ else
+ ((struct sockaddr_in6 *)&stor)->sin6_addr = in6addr_any;
for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) {
- cl.sin_port = htons((ushort)port);
- err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof(cl));
+ if (stor.ss_family == AF_INET)
+ ((struct sockaddr_in *)&stor)->sin_port = htons((ushort)port);
+ else
+ ((struct sockaddr_in6 *)&stor)->sin6_port = htons((ushort)port);
+ err = kernel_bind(sock, (struct sockaddr *)&stor, sizeof(stor));
if (err != -EADDRINUSE)
break;
}
return err;
}
-
static int
p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
{
int err;
+ char port_str[6];
struct socket *csocket;
- struct sockaddr_in sin_server;
+ struct sockaddr_storage stor = { 0 };
struct p9_fd_opts opts;
err = parse_opts(args, &opts);
if (err < 0)
return err;
- if (addr == NULL || valid_ipaddr4(addr) < 0)
+ if (!addr)
return -EINVAL;
+ sprintf(port_str, "%u", opts.port);
+ err = inet_pton_with_scope(current->nsproxy->net_ns, AF_UNSPEC, addr,
+ port_str, &stor);
+ if (err < 0)
+ return err;
+
csocket = NULL;
client->trans_opts.tcp.port = opts.port;
client->trans_opts.tcp.privport = opts.privport;
- sin_server.sin_family = AF_INET;
- sin_server.sin_addr.s_addr = in_aton(addr);
- sin_server.sin_port = htons(opts.port);
- err = __sock_create(current->nsproxy->net_ns, PF_INET,
+ err = __sock_create(current->nsproxy->net_ns, stor.ss_family,
SOCK_STREAM, IPPROTO_TCP, &csocket, 1);
if (err) {
pr_err("%s (%d): problem creating socket\n",
@@ -1031,8 +1025,8 @@ p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
}
err = READ_ONCE(csocket->ops)->connect(csocket,
- (struct sockaddr *)&sin_server,
- sizeof(struct sockaddr_in), 0);
+ (struct sockaddr *)&stor,
+ sizeof(stor), 0);
if (err < 0) {
pr_err("%s (%d): problem connecting socket to %s\n",
__func__, task_pid_nr(current), addr);
diff --git a/net/9p/trans_usbg.c b/net/9p/trans_usbg.c
new file mode 100644
index 000000000000..6b694f117aef
--- /dev/null
+++ b/net/9p/trans_usbg.c
@@ -0,0 +1,956 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * trans_usbg.c - USB peripheral usb9pfs configuration driver and transport.
+ *
+ * Copyright (C) 2024 Michael Grzeschik <m.grzeschik@pengutronix.de>
+ */
+
+/* Gadget usb9pfs only needs two bulk endpoints, and will use the usb9pfs
+ * transport to mount host exported filesystem via usb gadget.
+ */
+
+/* +--------------------------+ | +--------------------------+
+ * | 9PFS mounting client | | | 9PFS exporting server |
+ * SW | | | | |
+ * | (this:trans_usbg) | | |(e.g. diod or nfs-ganesha)|
+ * +-------------^------------+ | +-------------^------------+
+ * | | |
+ * ------------------|------------------------------------|-------------
+ * | | |
+ * +-------------v------------+ | +-------------v------------+
+ * | | | | |
+ * HW | USB Device Controller <---------> USB Host Controller |
+ * | | | | |
+ * +--------------------------+ | +--------------------------+
+ */
+
+#include <linux/cleanup.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/usb/composite.h>
+#include <linux/usb/func_utils.h>
+
+#include <net/9p/9p.h>
+#include <net/9p/client.h>
+#include <net/9p/transport.h>
+
+#define DEFAULT_BUFLEN 16384
+
+struct f_usb9pfs {
+ struct p9_client *client;
+
+ /* 9p request lock for en/dequeue */
+ spinlock_t lock;
+
+ struct usb_request *in_req;
+ struct usb_request *out_req;
+
+ struct usb_ep *in_ep;
+ struct usb_ep *out_ep;
+
+ struct completion send;
+ struct completion received;
+
+ unsigned int buflen;
+
+ struct usb_function function;
+};
+
+static inline struct f_usb9pfs *func_to_usb9pfs(struct usb_function *f)
+{
+ return container_of(f, struct f_usb9pfs, function);
+}
+
+struct f_usb9pfs_opts {
+ struct usb_function_instance func_inst;
+ unsigned int buflen;
+
+ struct f_usb9pfs_dev *dev;
+
+ /* Read/write access to configfs attributes is handled by configfs.
+ *
+ * This is to protect the data from concurrent access by read/write
+ * and create symlink/remove symlink.
+ */
+ struct mutex lock;
+ int refcnt;
+};
+
+struct f_usb9pfs_dev {
+ struct f_usb9pfs *usb9pfs;
+ struct f_usb9pfs_opts *opts;
+ char tag[41];
+ bool inuse;
+
+ struct list_head usb9pfs_instance;
+};
+
+static DEFINE_MUTEX(usb9pfs_lock);
+static struct list_head usbg_instance_list;
+
+static int usb9pfs_queue_tx(struct f_usb9pfs *usb9pfs, struct p9_req_t *p9_tx_req,
+ gfp_t gfp_flags)
+{
+ struct usb_composite_dev *cdev = usb9pfs->function.config->cdev;
+ struct usb_request *req = usb9pfs->in_req;
+ int ret;
+
+ if (!(p9_tx_req->tc.size % usb9pfs->in_ep->maxpacket))
+ req->zero = 1;
+
+ req->buf = p9_tx_req->tc.sdata;
+ req->length = p9_tx_req->tc.size;
+ req->context = p9_tx_req;
+
+ dev_dbg(&cdev->gadget->dev, "%s usb9pfs send --> %d/%d, zero: %d\n",
+ usb9pfs->in_ep->name, req->actual, req->length, req->zero);
+
+ ret = usb_ep_queue(usb9pfs->in_ep, req, gfp_flags);
+ if (ret)
+ req->context = NULL;
+
+ dev_dbg(&cdev->gadget->dev, "tx submit --> %d\n", ret);
+
+ return ret;
+}
+
+static int usb9pfs_queue_rx(struct f_usb9pfs *usb9pfs, struct usb_request *req,
+ gfp_t gfp_flags)
+{
+ struct usb_composite_dev *cdev = usb9pfs->function.config->cdev;
+ int ret;
+
+ ret = usb_ep_queue(usb9pfs->out_ep, req, gfp_flags);
+
+ dev_dbg(&cdev->gadget->dev, "rx submit --> %d\n", ret);
+
+ return ret;
+}
+
+static int usb9pfs_transmit(struct f_usb9pfs *usb9pfs, struct p9_req_t *p9_req)
+{
+ int ret = 0;
+
+ guard(spinlock_irqsave)(&usb9pfs->lock);
+
+ ret = usb9pfs_queue_tx(usb9pfs, p9_req, GFP_ATOMIC);
+ if (ret)
+ return ret;
+
+ list_del(&p9_req->req_list);
+
+ p9_req_get(p9_req);
+
+ return ret;
+}
+
+static void usb9pfs_tx_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct f_usb9pfs *usb9pfs = ep->driver_data;
+ struct usb_composite_dev *cdev = usb9pfs->function.config->cdev;
+ struct p9_req_t *p9_tx_req = req->context;
+ unsigned long flags;
+
+ /* reset zero packages */
+ req->zero = 0;
+
+ if (req->status) {
+ dev_err(&cdev->gadget->dev, "%s usb9pfs complete --> %d, %d/%d\n",
+ ep->name, req->status, req->actual, req->length);
+ return;
+ }
+
+ dev_dbg(&cdev->gadget->dev, "%s usb9pfs complete --> %d, %d/%d\n",
+ ep->name, req->status, req->actual, req->length);
+
+ spin_lock_irqsave(&usb9pfs->lock, flags);
+ WRITE_ONCE(p9_tx_req->status, REQ_STATUS_SENT);
+
+ p9_req_put(usb9pfs->client, p9_tx_req);
+
+ req->context = NULL;
+
+ spin_unlock_irqrestore(&usb9pfs->lock, flags);
+
+ complete(&usb9pfs->send);
+}
+
+static struct p9_req_t *usb9pfs_rx_header(struct f_usb9pfs *usb9pfs, void *buf)
+{
+ struct p9_req_t *p9_rx_req;
+ struct p9_fcall rc;
+ int ret;
+
+ /* start by reading header */
+ rc.sdata = buf;
+ rc.offset = 0;
+ rc.capacity = P9_HDRSZ;
+ rc.size = P9_HDRSZ;
+
+ p9_debug(P9_DEBUG_TRANS, "mux %p got %zu bytes\n", usb9pfs,
+ rc.capacity - rc.offset);
+
+ ret = p9_parse_header(&rc, &rc.size, NULL, NULL, 0);
+ if (ret) {
+ p9_debug(P9_DEBUG_ERROR,
+ "error parsing header: %d\n", ret);
+ return NULL;
+ }
+
+ p9_debug(P9_DEBUG_TRANS,
+ "mux %p pkt: size: %d bytes tag: %d\n",
+ usb9pfs, rc.size, rc.tag);
+
+ p9_rx_req = p9_tag_lookup(usb9pfs->client, rc.tag);
+ if (!p9_rx_req || p9_rx_req->status != REQ_STATUS_SENT) {
+ p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n", rc.tag);
+ return NULL;
+ }
+
+ if (rc.size > p9_rx_req->rc.capacity) {
+ p9_debug(P9_DEBUG_ERROR,
+ "requested packet size too big: %d for tag %d with capacity %zd\n",
+ rc.size, rc.tag, p9_rx_req->rc.capacity);
+ p9_req_put(usb9pfs->client, p9_rx_req);
+ return NULL;
+ }
+
+ if (!p9_rx_req->rc.sdata) {
+ p9_debug(P9_DEBUG_ERROR,
+ "No recv fcall for tag %d (req %p), disconnecting!\n",
+ rc.tag, p9_rx_req);
+ p9_req_put(usb9pfs->client, p9_rx_req);
+ return NULL;
+ }
+
+ return p9_rx_req;
+}
+
+static void usb9pfs_rx_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct f_usb9pfs *usb9pfs = ep->driver_data;
+ struct usb_composite_dev *cdev = usb9pfs->function.config->cdev;
+ struct p9_req_t *p9_rx_req;
+
+ if (req->status) {
+ dev_err(&cdev->gadget->dev, "%s usb9pfs complete --> %d, %d/%d\n",
+ ep->name, req->status, req->actual, req->length);
+ return;
+ }
+
+ p9_rx_req = usb9pfs_rx_header(usb9pfs, req->buf);
+ if (!p9_rx_req)
+ return;
+
+ memcpy(p9_rx_req->rc.sdata, req->buf, req->actual);
+
+ p9_rx_req->rc.size = req->actual;
+
+ p9_client_cb(usb9pfs->client, p9_rx_req, REQ_STATUS_RCVD);
+ p9_req_put(usb9pfs->client, p9_rx_req);
+
+ complete(&usb9pfs->received);
+}
+
+static void disable_ep(struct usb_composite_dev *cdev, struct usb_ep *ep)
+{
+ int value;
+
+ value = usb_ep_disable(ep);
+ if (value < 0)
+ dev_info(&cdev->gadget->dev,
+ "disable %s --> %d\n", ep->name, value);
+}
+
+static void disable_usb9pfs(struct f_usb9pfs *usb9pfs)
+{
+ struct usb_composite_dev *cdev =
+ usb9pfs->function.config->cdev;
+
+ if (usb9pfs->in_req) {
+ usb_ep_free_request(usb9pfs->in_ep, usb9pfs->in_req);
+ usb9pfs->in_req = NULL;
+ }
+
+ if (usb9pfs->out_req) {
+ usb_ep_free_request(usb9pfs->out_ep, usb9pfs->out_req);
+ usb9pfs->out_req = NULL;
+ }
+
+ disable_ep(cdev, usb9pfs->in_ep);
+ disable_ep(cdev, usb9pfs->out_ep);
+ dev_dbg(&cdev->gadget->dev, "%s disabled\n",
+ usb9pfs->function.name);
+}
+
+static int alloc_requests(struct usb_composite_dev *cdev,
+ struct f_usb9pfs *usb9pfs)
+{
+ int ret;
+
+ usb9pfs->in_req = usb_ep_alloc_request(usb9pfs->in_ep, GFP_ATOMIC);
+ if (!usb9pfs->in_req) {
+ ret = -ENOENT;
+ goto fail;
+ }
+
+ usb9pfs->out_req = alloc_ep_req(usb9pfs->out_ep, usb9pfs->buflen);
+ if (!usb9pfs->out_req) {
+ ret = -ENOENT;
+ goto fail_in;
+ }
+
+ usb9pfs->in_req->complete = usb9pfs_tx_complete;
+ usb9pfs->out_req->complete = usb9pfs_rx_complete;
+
+ /* length will be set in complete routine */
+ usb9pfs->in_req->context = usb9pfs;
+ usb9pfs->out_req->context = usb9pfs;
+
+ return 0;
+
+fail_in:
+ usb_ep_free_request(usb9pfs->in_ep, usb9pfs->in_req);
+fail:
+ return ret;
+}
+
+static int enable_endpoint(struct usb_composite_dev *cdev,
+ struct f_usb9pfs *usb9pfs, struct usb_ep *ep)
+{
+ int ret;
+
+ ret = config_ep_by_speed(cdev->gadget, &usb9pfs->function, ep);
+ if (ret)
+ return ret;
+
+ ret = usb_ep_enable(ep);
+ if (ret < 0)
+ return ret;
+
+ ep->driver_data = usb9pfs;
+
+ return 0;
+}
+
+static int
+enable_usb9pfs(struct usb_composite_dev *cdev, struct f_usb9pfs *usb9pfs)
+{
+ struct p9_client *client;
+ int ret = 0;
+
+ ret = enable_endpoint(cdev, usb9pfs, usb9pfs->in_ep);
+ if (ret)
+ goto out;
+
+ ret = enable_endpoint(cdev, usb9pfs, usb9pfs->out_ep);
+ if (ret)
+ goto disable_in;
+
+ ret = alloc_requests(cdev, usb9pfs);
+ if (ret)
+ goto disable_out;
+
+ client = usb9pfs->client;
+ if (client)
+ client->status = Connected;
+
+ dev_dbg(&cdev->gadget->dev, "%s enabled\n", usb9pfs->function.name);
+ return 0;
+
+disable_out:
+ usb_ep_disable(usb9pfs->out_ep);
+disable_in:
+ usb_ep_disable(usb9pfs->in_ep);
+out:
+ return ret;
+}
+
+static int p9_usbg_create(struct p9_client *client, const char *devname, char *args)
+{
+ struct f_usb9pfs_dev *dev;
+ struct f_usb9pfs *usb9pfs;
+ int ret = -ENOENT;
+ int found = 0;
+
+ if (!devname)
+ return -EINVAL;
+
+ guard(mutex)(&usb9pfs_lock);
+
+ list_for_each_entry(dev, &usbg_instance_list, usb9pfs_instance) {
+ if (!strncmp(devname, dev->tag, strlen(devname))) {
+ if (!dev->inuse) {
+ dev->inuse = true;
+ found = 1;
+ break;
+ }
+ ret = -EBUSY;
+ break;
+ }
+ }
+
+ if (!found) {
+ pr_err("no channels available for device %s\n", devname);
+ return ret;
+ }
+
+ usb9pfs = dev->usb9pfs;
+ if (!usb9pfs)
+ return -EINVAL;
+
+ client->trans = (void *)usb9pfs;
+ if (!usb9pfs->in_req)
+ client->status = Disconnected;
+ else
+ client->status = Connected;
+ usb9pfs->client = client;
+
+ client->trans_mod->maxsize = usb9pfs->buflen;
+
+ complete(&usb9pfs->received);
+
+ return 0;
+}
+
+static void usb9pfs_clear_tx(struct f_usb9pfs *usb9pfs)
+{
+ struct p9_req_t *req;
+
+ guard(spinlock_irqsave)(&usb9pfs->lock);
+
+ req = usb9pfs->in_req->context;
+ if (!req)
+ return;
+
+ if (!req->t_err)
+ req->t_err = -ECONNRESET;
+
+ p9_client_cb(usb9pfs->client, req, REQ_STATUS_ERROR);
+}
+
+static void p9_usbg_close(struct p9_client *client)
+{
+ struct f_usb9pfs *usb9pfs;
+ struct f_usb9pfs_dev *dev;
+ struct f_usb9pfs_opts *opts;
+
+ if (!client)
+ return;
+
+ usb9pfs = client->trans;
+ if (!usb9pfs)
+ return;
+
+ client->status = Disconnected;
+
+ usb9pfs_clear_tx(usb9pfs);
+
+ opts = container_of(usb9pfs->function.fi,
+ struct f_usb9pfs_opts, func_inst);
+
+ dev = opts->dev;
+
+ mutex_lock(&usb9pfs_lock);
+ dev->inuse = false;
+ mutex_unlock(&usb9pfs_lock);
+}
+
+static int p9_usbg_request(struct p9_client *client, struct p9_req_t *p9_req)
+{
+ struct f_usb9pfs *usb9pfs = client->trans;
+ int ret;
+
+ if (client->status != Connected)
+ return -EBUSY;
+
+ ret = wait_for_completion_killable(&usb9pfs->received);
+ if (ret)
+ return ret;
+
+ ret = usb9pfs_transmit(usb9pfs, p9_req);
+ if (ret)
+ return ret;
+
+ ret = wait_for_completion_killable(&usb9pfs->send);
+ if (ret)
+ return ret;
+
+ return usb9pfs_queue_rx(usb9pfs, usb9pfs->out_req, GFP_ATOMIC);
+}
+
+static int p9_usbg_cancel(struct p9_client *client, struct p9_req_t *req)
+{
+ struct f_usb9pfs *usb9pfs = client->trans;
+ int ret = 1;
+
+ p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
+
+ guard(spinlock_irqsave)(&usb9pfs->lock);
+
+ if (req->status == REQ_STATUS_UNSENT) {
+ list_del(&req->req_list);
+ WRITE_ONCE(req->status, REQ_STATUS_FLSHD);
+ p9_req_put(client, req);
+ ret = 0;
+ }
+
+ return ret;
+}
+
+static struct p9_trans_module p9_usbg_trans = {
+ .name = "usbg",
+ .create = p9_usbg_create,
+ .close = p9_usbg_close,
+ .request = p9_usbg_request,
+ .cancel = p9_usbg_cancel,
+ .owner = THIS_MODULE,
+};
+
+/*-------------------------------------------------------------------------*/
+
+#define USB_PROTOCOL_9PFS 0x09
+
+static struct usb_interface_descriptor usb9pfs_intf = {
+ .bLength = sizeof(usb9pfs_intf),
+ .bDescriptorType = USB_DT_INTERFACE,
+
+ .bNumEndpoints = 2,
+ .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
+ .bInterfaceSubClass = USB_SUBCLASS_VENDOR_SPEC,
+ .bInterfaceProtocol = USB_PROTOCOL_9PFS,
+
+ /* .iInterface = DYNAMIC */
+};
+
+/* full speed support: */
+
+static struct usb_endpoint_descriptor fs_usb9pfs_source_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+};
+
+static struct usb_endpoint_descriptor fs_usb9pfs_sink_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+};
+
+static struct usb_descriptor_header *fs_usb9pfs_descs[] = {
+ (struct usb_descriptor_header *)&usb9pfs_intf,
+ (struct usb_descriptor_header *)&fs_usb9pfs_sink_desc,
+ (struct usb_descriptor_header *)&fs_usb9pfs_source_desc,
+ NULL,
+};
+
+/* high speed support: */
+
+static struct usb_endpoint_descriptor hs_usb9pfs_source_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = cpu_to_le16(512),
+};
+
+static struct usb_endpoint_descriptor hs_usb9pfs_sink_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = cpu_to_le16(512),
+};
+
+static struct usb_descriptor_header *hs_usb9pfs_descs[] = {
+ (struct usb_descriptor_header *)&usb9pfs_intf,
+ (struct usb_descriptor_header *)&hs_usb9pfs_source_desc,
+ (struct usb_descriptor_header *)&hs_usb9pfs_sink_desc,
+ NULL,
+};
+
+/* super speed support: */
+
+static struct usb_endpoint_descriptor ss_usb9pfs_source_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = cpu_to_le16(1024),
+};
+
+static struct usb_ss_ep_comp_descriptor ss_usb9pfs_source_comp_desc = {
+ .bLength = USB_DT_SS_EP_COMP_SIZE,
+ .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+ .bMaxBurst = 0,
+ .bmAttributes = 0,
+ .wBytesPerInterval = 0,
+};
+
+static struct usb_endpoint_descriptor ss_usb9pfs_sink_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = cpu_to_le16(1024),
+};
+
+static struct usb_ss_ep_comp_descriptor ss_usb9pfs_sink_comp_desc = {
+ .bLength = USB_DT_SS_EP_COMP_SIZE,
+ .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+ .bMaxBurst = 0,
+ .bmAttributes = 0,
+ .wBytesPerInterval = 0,
+};
+
+static struct usb_descriptor_header *ss_usb9pfs_descs[] = {
+ (struct usb_descriptor_header *)&usb9pfs_intf,
+ (struct usb_descriptor_header *)&ss_usb9pfs_source_desc,
+ (struct usb_descriptor_header *)&ss_usb9pfs_source_comp_desc,
+ (struct usb_descriptor_header *)&ss_usb9pfs_sink_desc,
+ (struct usb_descriptor_header *)&ss_usb9pfs_sink_comp_desc,
+ NULL,
+};
+
+/* function-specific strings: */
+static struct usb_string strings_usb9pfs[] = {
+ [0].s = "usb9pfs input to output",
+ { } /* end of list */
+};
+
+static struct usb_gadget_strings stringtab_usb9pfs = {
+ .language = 0x0409, /* en-us */
+ .strings = strings_usb9pfs,
+};
+
+static struct usb_gadget_strings *usb9pfs_strings[] = {
+ &stringtab_usb9pfs,
+ NULL,
+};
+
+/*-------------------------------------------------------------------------*/
+
+static int usb9pfs_func_bind(struct usb_configuration *c,
+ struct usb_function *f)
+{
+ struct f_usb9pfs *usb9pfs = func_to_usb9pfs(f);
+ struct f_usb9pfs_opts *opts;
+ struct usb_composite_dev *cdev = c->cdev;
+ int ret;
+ int id;
+
+ /* allocate interface ID(s) */
+ id = usb_interface_id(c, f);
+ if (id < 0)
+ return id;
+ usb9pfs_intf.bInterfaceNumber = id;
+
+ id = usb_string_id(cdev);
+ if (id < 0)
+ return id;
+ strings_usb9pfs[0].id = id;
+ usb9pfs_intf.iInterface = id;
+
+ /* allocate endpoints */
+ usb9pfs->in_ep = usb_ep_autoconfig(cdev->gadget,
+ &fs_usb9pfs_source_desc);
+ if (!usb9pfs->in_ep)
+ goto autoconf_fail;
+
+ usb9pfs->out_ep = usb_ep_autoconfig(cdev->gadget,
+ &fs_usb9pfs_sink_desc);
+ if (!usb9pfs->out_ep)
+ goto autoconf_fail;
+
+ /* support high speed hardware */
+ hs_usb9pfs_source_desc.bEndpointAddress =
+ fs_usb9pfs_source_desc.bEndpointAddress;
+ hs_usb9pfs_sink_desc.bEndpointAddress =
+ fs_usb9pfs_sink_desc.bEndpointAddress;
+
+ /* support super speed hardware */
+ ss_usb9pfs_source_desc.bEndpointAddress =
+ fs_usb9pfs_source_desc.bEndpointAddress;
+ ss_usb9pfs_sink_desc.bEndpointAddress =
+ fs_usb9pfs_sink_desc.bEndpointAddress;
+
+ ret = usb_assign_descriptors(f, fs_usb9pfs_descs, hs_usb9pfs_descs,
+ ss_usb9pfs_descs, ss_usb9pfs_descs);
+ if (ret)
+ return ret;
+
+ opts = container_of(f->fi, struct f_usb9pfs_opts, func_inst);
+ opts->dev->usb9pfs = usb9pfs;
+
+ dev_dbg(&cdev->gadget->dev, "%s speed %s: IN/%s, OUT/%s\n",
+ (gadget_is_superspeed(c->cdev->gadget) ? "super" :
+ (gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full")),
+ f->name, usb9pfs->in_ep->name, usb9pfs->out_ep->name);
+
+ return 0;
+
+autoconf_fail:
+ ERROR(cdev, "%s: can't autoconfigure on %s\n",
+ f->name, cdev->gadget->name);
+ return -ENODEV;
+}
+
+static void usb9pfs_func_unbind(struct usb_configuration *c,
+ struct usb_function *f)
+{
+ struct f_usb9pfs *usb9pfs = func_to_usb9pfs(f);
+
+ disable_usb9pfs(usb9pfs);
+}
+
+static void usb9pfs_free_func(struct usb_function *f)
+{
+ struct f_usb9pfs *usb9pfs = func_to_usb9pfs(f);
+ struct f_usb9pfs_opts *opts;
+
+ kfree(usb9pfs);
+
+ opts = container_of(f->fi, struct f_usb9pfs_opts, func_inst);
+
+ mutex_lock(&opts->lock);
+ opts->refcnt--;
+ mutex_unlock(&opts->lock);
+
+ usb_free_all_descriptors(f);
+}
+
+static int usb9pfs_set_alt(struct usb_function *f,
+ unsigned int intf, unsigned int alt)
+{
+ struct f_usb9pfs *usb9pfs = func_to_usb9pfs(f);
+ struct usb_composite_dev *cdev = f->config->cdev;
+
+ return enable_usb9pfs(cdev, usb9pfs);
+}
+
+static void usb9pfs_disable(struct usb_function *f)
+{
+ struct f_usb9pfs *usb9pfs = func_to_usb9pfs(f);
+
+ usb9pfs_clear_tx(usb9pfs);
+}
+
+static struct usb_function *usb9pfs_alloc(struct usb_function_instance *fi)
+{
+ struct f_usb9pfs_opts *usb9pfs_opts;
+ struct f_usb9pfs *usb9pfs;
+
+ usb9pfs = kzalloc(sizeof(*usb9pfs), GFP_KERNEL);
+ if (!usb9pfs)
+ return ERR_PTR(-ENOMEM);
+
+ spin_lock_init(&usb9pfs->lock);
+
+ init_completion(&usb9pfs->send);
+ init_completion(&usb9pfs->received);
+
+ usb9pfs_opts = container_of(fi, struct f_usb9pfs_opts, func_inst);
+
+ mutex_lock(&usb9pfs_opts->lock);
+ usb9pfs_opts->refcnt++;
+ mutex_unlock(&usb9pfs_opts->lock);
+
+ usb9pfs->buflen = usb9pfs_opts->buflen;
+
+ usb9pfs->function.name = "usb9pfs";
+ usb9pfs->function.bind = usb9pfs_func_bind;
+ usb9pfs->function.unbind = usb9pfs_func_unbind;
+ usb9pfs->function.set_alt = usb9pfs_set_alt;
+ usb9pfs->function.disable = usb9pfs_disable;
+ usb9pfs->function.strings = usb9pfs_strings;
+
+ usb9pfs->function.free_func = usb9pfs_free_func;
+
+ return &usb9pfs->function;
+}
+
+static inline struct f_usb9pfs_opts *to_f_usb9pfs_opts(struct config_item *item)
+{
+ return container_of(to_config_group(item), struct f_usb9pfs_opts,
+ func_inst.group);
+}
+
+static inline struct f_usb9pfs_opts *fi_to_f_usb9pfs_opts(struct usb_function_instance *fi)
+{
+ return container_of(fi, struct f_usb9pfs_opts, func_inst);
+}
+
+static void usb9pfs_attr_release(struct config_item *item)
+{
+ struct f_usb9pfs_opts *usb9pfs_opts = to_f_usb9pfs_opts(item);
+
+ usb_put_function_instance(&usb9pfs_opts->func_inst);
+}
+
+static struct configfs_item_operations usb9pfs_item_ops = {
+ .release = usb9pfs_attr_release,
+};
+
+static ssize_t f_usb9pfs_opts_buflen_show(struct config_item *item, char *page)
+{
+ struct f_usb9pfs_opts *opts = to_f_usb9pfs_opts(item);
+ int ret;
+
+ mutex_lock(&opts->lock);
+ ret = sysfs_emit(page, "%d\n", opts->buflen);
+ mutex_unlock(&opts->lock);
+
+ return ret;
+}
+
+static ssize_t f_usb9pfs_opts_buflen_store(struct config_item *item,
+ const char *page, size_t len)
+{
+ struct f_usb9pfs_opts *opts = to_f_usb9pfs_opts(item);
+ int ret;
+ u32 num;
+
+ guard(mutex)(&opts->lock);
+
+ if (opts->refcnt)
+ return -EBUSY;
+
+ ret = kstrtou32(page, 0, &num);
+ if (ret)
+ return ret;
+
+ opts->buflen = num;
+
+ return len;
+}
+
+CONFIGFS_ATTR(f_usb9pfs_opts_, buflen);
+
+static struct configfs_attribute *usb9pfs_attrs[] = {
+ &f_usb9pfs_opts_attr_buflen,
+ NULL,
+};
+
+static const struct config_item_type usb9pfs_func_type = {
+ .ct_item_ops = &usb9pfs_item_ops,
+ .ct_attrs = usb9pfs_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct f_usb9pfs_dev *_usb9pfs_do_find_dev(const char *tag)
+{
+ struct f_usb9pfs_dev *usb9pfs_dev;
+
+ if (!tag)
+ return NULL;
+
+ list_for_each_entry(usb9pfs_dev, &usbg_instance_list, usb9pfs_instance) {
+ if (strcmp(usb9pfs_dev->tag, tag) == 0)
+ return usb9pfs_dev;
+ }
+
+ return NULL;
+}
+
+static int usb9pfs_tag_instance(struct f_usb9pfs_dev *dev, const char *tag)
+{
+ struct f_usb9pfs_dev *existing;
+ int ret = 0;
+
+ guard(mutex)(&usb9pfs_lock);
+
+ existing = _usb9pfs_do_find_dev(tag);
+ if (!existing)
+ strscpy(dev->tag, tag, ARRAY_SIZE(dev->tag));
+ else if (existing != dev)
+ ret = -EBUSY;
+
+ return ret;
+}
+
+static int usb9pfs_set_inst_tag(struct usb_function_instance *fi, const char *tag)
+{
+ if (strlen(tag) >= sizeof_field(struct f_usb9pfs_dev, tag))
+ return -ENAMETOOLONG;
+ return usb9pfs_tag_instance(fi_to_f_usb9pfs_opts(fi)->dev, tag);
+}
+
+static void usb9pfs_free_instance(struct usb_function_instance *fi)
+{
+ struct f_usb9pfs_opts *usb9pfs_opts =
+ container_of(fi, struct f_usb9pfs_opts, func_inst);
+ struct f_usb9pfs_dev *dev = usb9pfs_opts->dev;
+
+ mutex_lock(&usb9pfs_lock);
+ list_del(&dev->usb9pfs_instance);
+ mutex_unlock(&usb9pfs_lock);
+
+ kfree(usb9pfs_opts);
+}
+
+static struct usb_function_instance *usb9pfs_alloc_instance(void)
+{
+ struct f_usb9pfs_opts *usb9pfs_opts;
+ struct f_usb9pfs_dev *dev;
+
+ usb9pfs_opts = kzalloc(sizeof(*usb9pfs_opts), GFP_KERNEL);
+ if (!usb9pfs_opts)
+ return ERR_PTR(-ENOMEM);
+
+ mutex_init(&usb9pfs_opts->lock);
+
+ usb9pfs_opts->func_inst.set_inst_name = usb9pfs_set_inst_tag;
+ usb9pfs_opts->func_inst.free_func_inst = usb9pfs_free_instance;
+
+ usb9pfs_opts->buflen = DEFAULT_BUFLEN;
+
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev) {
+ kfree(usb9pfs_opts);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ usb9pfs_opts->dev = dev;
+ dev->opts = usb9pfs_opts;
+
+ config_group_init_type_name(&usb9pfs_opts->func_inst.group, "",
+ &usb9pfs_func_type);
+
+ mutex_lock(&usb9pfs_lock);
+ list_add_tail(&dev->usb9pfs_instance, &usbg_instance_list);
+ mutex_unlock(&usb9pfs_lock);
+
+ return &usb9pfs_opts->func_inst;
+}
+DECLARE_USB_FUNCTION(usb9pfs, usb9pfs_alloc_instance, usb9pfs_alloc);
+
+static int __init usb9pfs_modinit(void)
+{
+ int ret;
+
+ INIT_LIST_HEAD(&usbg_instance_list);
+
+ ret = usb_function_register(&usb9pfsusb_func);
+ if (!ret)
+ v9fs_register_trans(&p9_usbg_trans);
+
+ return ret;
+}
+
+static void __exit usb9pfs_modexit(void)
+{
+ usb_function_unregister(&usb9pfsusb_func);
+ v9fs_unregister_trans(&p9_usbg_trans);
+}
+
+module_init(usb9pfs_modinit);
+module_exit(usb9pfs_modexit);
+
+MODULE_ALIAS_9P("usbg");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("USB gadget 9pfs transport");
+MODULE_AUTHOR("Michael Grzeschik");
diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index e305071eb7b8..0b8086f58ad5 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -781,7 +781,6 @@ static struct virtio_driver p9_virtio_drv = {
.feature_table = features,
.feature_table_size = ARRAY_SIZE(features),
.driver.name = KBUILD_MODNAME,
- .driver.owner = THIS_MODULE,
.id_table = id_table,
.probe = p9_virtio_probe,
.remove = p9_virtio_remove,
diff --git a/net/9p/trans_xen.c b/net/9p/trans_xen.c
index dfdbe1ca5338..b9ff69c7522a 100644
--- a/net/9p/trans_xen.c
+++ b/net/9p/trans_xen.c
@@ -286,7 +286,7 @@ static void xen_9pfs_front_free(struct xen_9pfs_front_priv *priv)
if (!priv->rings[i].intf)
break;
if (priv->rings[i].irq > 0)
- unbind_from_irqhandler(priv->rings[i].irq, priv->dev);
+ unbind_from_irqhandler(priv->rings[i].irq, ring);
if (priv->rings[i].data.in) {
for (j = 0;
j < (1 << priv->rings[i].intf->ring_order);
@@ -465,6 +465,7 @@ static int xen_9pfs_front_init(struct xenbus_device *dev)
goto error;
}
+ xenbus_switch_state(dev, XenbusStateInitialised);
return 0;
error_xenbus:
@@ -512,8 +513,10 @@ static void xen_9pfs_front_changed(struct xenbus_device *dev,
break;
case XenbusStateInitWait:
- if (!xen_9pfs_front_init(dev))
- xenbus_switch_state(dev, XenbusStateInitialised);
+ if (dev->state != XenbusStateInitialising)
+ break;
+
+ xen_9pfs_front_init(dev);
break;
case XenbusStateConnected:
generated by cgit (git 2.34.1) at 2025-07-12 10:11:07 +0000