Commit e2735b77 authored by Eric Van Hensbergen's avatar Eric Van Hensbergen Committed by Eric Van Hensbergen

9p: block-based virtio client

This replaces the console-based virto client with a block-based
client using a single request queue.
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
parent 043aba40
...@@ -40,7 +40,7 @@ struct p9_trans { ...@@ -40,7 +40,7 @@ struct p9_trans {
void (*close) (struct p9_trans *); void (*close) (struct p9_trans *);
unsigned int (*poll)(struct p9_trans *, struct poll_table_struct *); unsigned int (*poll)(struct p9_trans *, struct poll_table_struct *);
int (*rpc) (struct p9_trans *t, struct p9_fcall *tc, int (*rpc) (struct p9_trans *t, struct p9_fcall *tc,
struct p9_fcall **rc); struct p9_fcall **rc, int msize, int dotu);
}; };
struct p9_trans_module { struct p9_trans_module {
......
...@@ -51,7 +51,7 @@ p9_client_rpc(struct p9_client *c, struct p9_fcall *tc, ...@@ -51,7 +51,7 @@ p9_client_rpc(struct p9_client *c, struct p9_fcall *tc,
struct p9_fcall **rc) struct p9_fcall **rc)
{ {
if (c->trans->rpc) if (c->trans->rpc)
return c->trans->rpc(c->trans, tc, rc); return c->trans->rpc(c->trans, tc, rc, c->msize, c->dotu);
else else
return p9_conn_rpc(c->conn, tc, rc); return p9_conn_rpc(c->conn, tc, rc);
} }
...@@ -99,7 +99,7 @@ struct p9_client *p9_client_create(struct p9_trans *trans, int msize, ...@@ -99,7 +99,7 @@ struct p9_client *p9_client_create(struct p9_trans *trans, int msize,
goto error; goto error;
} }
err = p9_client_rpc(clnt->conn, tc, &rc); err = p9_client_rpc(clnt, tc, &rc);
if (err) if (err)
goto error; goto error;
...@@ -191,7 +191,7 @@ struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, ...@@ -191,7 +191,7 @@ struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
goto error; goto error;
} }
err = p9_client_rpc(clnt->conn, tc, &rc); err = p9_client_rpc(clnt, tc, &rc);
if (err) if (err)
goto error; goto error;
...@@ -236,7 +236,7 @@ struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname, ...@@ -236,7 +236,7 @@ struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname,
goto error; goto error;
} }
err = p9_client_rpc(clnt->conn, tc, &rc); err = p9_client_rpc(clnt, tc, &rc);
if (err) if (err)
goto error; goto error;
...@@ -287,7 +287,7 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames, ...@@ -287,7 +287,7 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
goto error; goto error;
} }
err = p9_client_rpc(clnt->conn, tc, &rc); err = p9_client_rpc(clnt, tc, &rc);
if (err) { if (err) {
if (rc && rc->id == P9_RWALK) if (rc && rc->id == P9_RWALK)
goto clunk_fid; goto clunk_fid;
...@@ -322,7 +322,7 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames, ...@@ -322,7 +322,7 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
goto error; goto error;
} }
p9_client_rpc(clnt->conn, tc, &rc); p9_client_rpc(clnt, tc, &rc);
error: error:
kfree(tc); kfree(tc);
...@@ -356,7 +356,7 @@ int p9_client_open(struct p9_fid *fid, int mode) ...@@ -356,7 +356,7 @@ int p9_client_open(struct p9_fid *fid, int mode)
goto done; goto done;
} }
err = p9_client_rpc(clnt->conn, tc, &rc); err = p9_client_rpc(clnt, tc, &rc);
if (err) if (err)
goto done; goto done;
...@@ -395,7 +395,7 @@ int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, ...@@ -395,7 +395,7 @@ int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
goto done; goto done;
} }
err = p9_client_rpc(clnt->conn, tc, &rc); err = p9_client_rpc(clnt, tc, &rc);
if (err) if (err)
goto done; goto done;
...@@ -428,7 +428,7 @@ int p9_client_clunk(struct p9_fid *fid) ...@@ -428,7 +428,7 @@ int p9_client_clunk(struct p9_fid *fid)
goto done; goto done;
} }
err = p9_client_rpc(clnt->conn, tc, &rc); err = p9_client_rpc(clnt, tc, &rc);
if (err) if (err)
goto done; goto done;
...@@ -460,7 +460,7 @@ int p9_client_remove(struct p9_fid *fid) ...@@ -460,7 +460,7 @@ int p9_client_remove(struct p9_fid *fid)
goto done; goto done;
} }
err = p9_client_rpc(clnt->conn, tc, &rc); err = p9_client_rpc(clnt, tc, &rc);
if (err) if (err)
goto done; goto done;
...@@ -502,7 +502,7 @@ int p9_client_read(struct p9_fid *fid, char *data, u64 offset, u32 count) ...@@ -502,7 +502,7 @@ int p9_client_read(struct p9_fid *fid, char *data, u64 offset, u32 count)
goto error; goto error;
} }
err = p9_client_rpc(clnt->conn, tc, &rc); err = p9_client_rpc(clnt, tc, &rc);
if (err) if (err)
goto error; goto error;
...@@ -559,7 +559,7 @@ int p9_client_write(struct p9_fid *fid, char *data, u64 offset, u32 count) ...@@ -559,7 +559,7 @@ int p9_client_write(struct p9_fid *fid, char *data, u64 offset, u32 count)
goto error; goto error;
} }
err = p9_client_rpc(clnt->conn, tc, &rc); err = p9_client_rpc(clnt, tc, &rc);
if (err) if (err)
goto error; goto error;
...@@ -613,7 +613,7 @@ p9_client_uread(struct p9_fid *fid, char __user *data, u64 offset, u32 count) ...@@ -613,7 +613,7 @@ p9_client_uread(struct p9_fid *fid, char __user *data, u64 offset, u32 count)
goto error; goto error;
} }
err = p9_client_rpc(clnt->conn, tc, &rc); err = p9_client_rpc(clnt, tc, &rc);
if (err) if (err)
goto error; goto error;
...@@ -677,7 +677,7 @@ p9_client_uwrite(struct p9_fid *fid, const char __user *data, u64 offset, ...@@ -677,7 +677,7 @@ p9_client_uwrite(struct p9_fid *fid, const char __user *data, u64 offset,
goto error; goto error;
} }
err = p9_client_rpc(clnt->conn, tc, &rc); err = p9_client_rpc(clnt, tc, &rc);
if (err) if (err)
goto error; goto error;
...@@ -748,7 +748,7 @@ struct p9_stat *p9_client_stat(struct p9_fid *fid) ...@@ -748,7 +748,7 @@ struct p9_stat *p9_client_stat(struct p9_fid *fid)
goto error; goto error;
} }
err = p9_client_rpc(clnt->conn, tc, &rc); err = p9_client_rpc(clnt, tc, &rc);
if (err) if (err)
goto error; goto error;
...@@ -790,7 +790,7 @@ int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) ...@@ -790,7 +790,7 @@ int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
goto done; goto done;
} }
err = p9_client_rpc(clnt->conn, tc, &rc); err = p9_client_rpc(clnt, tc, &rc);
done: done:
kfree(tc); kfree(tc);
...@@ -847,7 +847,7 @@ struct p9_stat *p9_client_dirread(struct p9_fid *fid, u64 offset) ...@@ -847,7 +847,7 @@ struct p9_stat *p9_client_dirread(struct p9_fid *fid, u64 offset)
goto error; goto error;
} }
err = p9_client_rpc(clnt->conn, tc, &rc); err = p9_client_rpc(clnt, tc, &rc);
if (err) if (err)
goto error; goto error;
......
/* /*
* The Guest 9p transport driver * The Guest 9p transport driver
* *
* This is a trivial pipe-based transport driver based on the lguest console * This is a block based transport driver based on the lguest block driver
* code: we use lguest's DMA mechanism to send bytes out, and register a * code.
* DMA buffer to receive bytes in. It is assumed to be present and available
* from the very beginning of boot.
*
* This may be have been done by just instaniating another HVC console,
* but HVC's blocksize of 16 bytes is annoying and painful to performance.
*
* A more efficient transport could be built based on the virtio block driver
* but it requires some changes in the 9p transport model (which are in
* progress)
* *
*/ */
/* /*
...@@ -55,11 +46,25 @@ ...@@ -55,11 +46,25 @@
#include <linux/virtio.h> #include <linux/virtio.h>
#include <linux/virtio_9p.h> #include <linux/virtio_9p.h>
#define VIRTQUEUE_NUM 128
/* a single mutex to manage channel initialization and attachment */ /* a single mutex to manage channel initialization and attachment */
static DECLARE_MUTEX(virtio_9p_lock); static DECLARE_MUTEX(virtio_9p_lock);
/* global which tracks highest initialized channel */ /* global which tracks highest initialized channel */
static int chan_index; static int chan_index;
#define P9_INIT_MAXTAG 16
#define REQ_STATUS_IDLE 0
#define REQ_STATUS_SENT 1
#define REQ_STATUS_RCVD 2
#define REQ_STATUS_FLSH 3
struct p9_req_t {
int status;
wait_queue_head_t *wq;
};
/* We keep all per-channel information in a structure. /* We keep all per-channel information in a structure.
* This structure is allocated within the devices dev->mem space. * This structure is allocated within the devices dev->mem space.
* A pointer to the structure will get put in the transport private. * A pointer to the structure will get put in the transport private.
...@@ -68,16 +73,57 @@ static struct virtio_chan { ...@@ -68,16 +73,57 @@ static struct virtio_chan {
bool initialized; /* channel is initialized */ bool initialized; /* channel is initialized */
bool inuse; /* channel is in use */ bool inuse; /* channel is in use */
struct virtqueue *in_vq, *out_vq; spinlock_t lock;
struct virtio_device *vdev; struct virtio_device *vdev;
struct virtqueue *vq;
/* This is our input buffer, and how much data is left in it. */ struct p9_idpool *tagpool;
unsigned int in_len; struct p9_req_t *reqs;
char *in, *inbuf; int max_tag;
wait_queue_head_t wq; /* waitq for buffer */ /* Scatterlist: can be too big for stack. */
struct scatterlist sg[VIRTQUEUE_NUM];
} channels[MAX_9P_CHAN]; } channels[MAX_9P_CHAN];
/* Lookup requests by tag */
static struct p9_req_t *p9_lookup_tag(struct virtio_chan *c, u16 tag)
{
/* This looks up the original request by tag so we know which
* buffer to read the data into */
tag++;
while (tag >= c->max_tag) {
int old_max = c->max_tag;
int count;
if (c->max_tag)
c->max_tag *= 2;
else
c->max_tag = P9_INIT_MAXTAG;
c->reqs = krealloc(c->reqs, sizeof(struct p9_req_t)*c->max_tag,
GFP_ATOMIC);
if (!c->reqs) {
printk(KERN_ERR "Couldn't grow tag array\n");
BUG();
}
for (count = old_max; count < c->max_tag; count++) {
c->reqs[count].status = REQ_STATUS_IDLE;
c->reqs[count].wq = kmalloc(sizeof(wait_queue_t),
GFP_ATOMIC);
if (!c->reqs[count].wq) {
printk(KERN_ERR "Couldn't grow tag array\n");
BUG();
}
init_waitqueue_head(c->reqs[count].wq);
}
}
return &c->reqs[tag];
}
/* How many bytes left in this page. */ /* How many bytes left in this page. */
static unsigned int rest_of_page(void *data) static unsigned int rest_of_page(void *data)
{ {
...@@ -86,128 +132,163 @@ static unsigned int rest_of_page(void *data) ...@@ -86,128 +132,163 @@ static unsigned int rest_of_page(void *data)
static int p9_virtio_write(struct p9_trans *trans, void *buf, int count) static int p9_virtio_write(struct p9_trans *trans, void *buf, int count)
{ {
struct virtio_chan *chan = (struct virtio_chan *) trans->priv; /* Only use the rpc mechanism for now */
struct virtqueue *out_vq = chan->out_vq; return count;
struct scatterlist sg[1]; }
unsigned int len;
P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio write (%d)\n", count); static int p9_virtio_read(struct p9_trans *trans, void *buf, int count)
{
/* Only use the rpc mechanism for now */
return 0;
}
/* keep it simple - make sure we don't overflow a page */ /* The poll function is used by 9p transports to determine if there
if (rest_of_page(buf) < count) * is there is activity available on a particular channel. In our case
count = rest_of_page(buf); * we use it to wait for a callback from the input routines.
*/
static unsigned int
p9_virtio_poll(struct p9_trans *trans, struct poll_table_struct *pt)
{
/* Only use the rpc mechanism for now */
return 0;
}
sg_init_one(sg, buf, count); static void p9_virtio_close(struct p9_trans *trans)
{
struct virtio_chan *chan = trans->priv;
int count;
unsigned int flags;
/* add_buf wants a token to identify this buffer: we hand it any spin_lock_irqsave(&chan->lock, flags);
* non-NULL pointer, since there's only ever one buffer. */ p9_idpool_destroy(chan->tagpool);
if (out_vq->vq_ops->add_buf(out_vq, sg, 1, 0, (void *)1) == 0) { for (count = 0; count < chan->max_tag; count++)
/* Tell Host to go! */ kfree(chan->reqs[count].wq);
out_vq->vq_ops->kick(out_vq); kfree(chan->reqs);
/* Chill out until it's done with the buffer. */ chan->max_tag = 0;
while (!out_vq->vq_ops->get_buf(out_vq, &len)) spin_unlock_irqrestore(&chan->lock, flags);
cpu_relax();
}
P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio wrote (%d)\n", count); down(&virtio_9p_lock);
chan->inuse = false;
up(&virtio_9p_lock);
/* We're expected to return the amount of data we wrote: all of it. */ kfree(trans);
return count;
} }
/* Create a scatter-gather list representing our input buffer and put it in the static void req_done(struct virtqueue *vq)
* queue. */
static void add_inbuf(struct virtio_chan *chan)
{ {
struct scatterlist sg[1]; struct virtio_chan *chan = vq->vdev->priv;
struct p9_fcall *rc;
unsigned int len;
unsigned long flags;
struct p9_req_t *req;
spin_lock_irqsave(&chan->lock, flags);
while ((rc = chan->vq->vq_ops->get_buf(chan->vq, &len)) != NULL) {
req = p9_lookup_tag(chan, rc->tag);
req->status = REQ_STATUS_RCVD;
wake_up(req->wq);
}
/* In case queue is stopped waiting for more buffers. */
spin_unlock_irqrestore(&chan->lock, flags);
}
sg_init_one(sg, chan->inbuf, PAGE_SIZE); static int
pack_sg_list(struct scatterlist *sg, int start, int limit, char *data,
int count)
{
int s;
int index = start;
while (count) {
s = rest_of_page(data);
if (s > count)
s = count;
sg_set_buf(&sg[index++], data, s);
count -= s;
data += s;
if (index > limit)
BUG();
}
/* We should always be able to add one buffer to an empty queue. */ return index-start;
if (chan->in_vq->vq_ops->add_buf(chan->in_vq, sg, 0, 1, chan->inbuf))
BUG();
chan->in_vq->vq_ops->kick(chan->in_vq);
} }
static int p9_virtio_read(struct p9_trans *trans, void *buf, int count) static int
p9_virtio_rpc(struct p9_trans *t, struct p9_fcall *tc, struct p9_fcall **rc,
int msize, int dotu)
{ {
struct virtio_chan *chan = (struct virtio_chan *) trans->priv; int in, out;
struct virtqueue *in_vq = chan->in_vq; int n, err, size;
struct virtio_chan *chan = t->priv;
P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio read (%d)\n", count); char *rdata;
struct p9_req_t *req;
unsigned long flags;
if (*rc == NULL) {
*rc = kmalloc(sizeof(struct p9_fcall) + msize, GFP_KERNEL);
if (!*rc)
return -ENOMEM;
}
/* If we don't have an input queue yet, we can't get input. */ rdata = (char *)*rc+sizeof(struct p9_fcall);
BUG_ON(!in_vq);
/* No buffer? Try to get one. */ spin_lock_irqsave(&chan->lock, flags);
if (!chan->in_len) { n = P9_NOTAG;
chan->in = in_vq->vq_ops->get_buf(in_vq, &chan->in_len); if (tc->id != P9_TVERSION) {
if (!chan->in) n = p9_idpool_get(chan->tagpool);
return 0; if (n < 0)
return -ENOMEM;
} }
/* You want more than we have to give? Well, try wanting less! */ req = p9_lookup_tag(chan, n);
if (chan->in_len < count) spin_unlock_irqrestore(&chan->lock, flags);
count = chan->in_len;
/* Copy across to their buffer and increment offset. */ p9_set_tag(tc, n);
memcpy(buf, chan->in, count);
chan->in += count;
chan->in_len -= count;
/* Finished? Re-register buffer so Host will use it again. */ P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio rpc tag %d\n", n);
if (chan->in_len == 0)
add_inbuf(chan);
P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio finished read (%d)\n", out = pack_sg_list(chan->sg, 0, VIRTQUEUE_NUM, tc->sdata, tc->size);
count); in = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM-out, rdata, msize);
return count; req->status = REQ_STATUS_SENT;
}
/* The poll function is used by 9p transports to determine if there if (chan->vq->vq_ops->add_buf(chan->vq, chan->sg, out, in, tc)) {
* is there is activity available on a particular channel. In our case P9_DPRINTK(P9_DEBUG_TRANS,
* we use it to wait for a callback from the input routines. "9p debug: virtio rpc add_buf returned failure");
*/ return -EIO;
static unsigned int }
p9_virtio_poll(struct p9_trans *trans, struct poll_table_struct *pt)
{
struct virtio_chan *chan = (struct virtio_chan *)trans->priv;
struct virtqueue *in_vq = chan->in_vq;
int ret = POLLOUT; /* we can always handle more output */
poll_wait(NULL, &chan->wq, pt); chan->vq->vq_ops->kick(chan->vq);
/* No buffer? Try to get one. */ wait_event(*req->wq, req->status == REQ_STATUS_RCVD);
if (!chan->in_len)
chan->in = in_vq->vq_ops->get_buf(in_vq, &chan->in_len);
if (chan->in_len) size = le32_to_cpu(*(__le32 *) rdata);
ret |= POLLIN;
return ret; err = p9_deserialize_fcall(rdata, size, *rc, dotu);
} if (err < 0) {
P9_DPRINTK(P9_DEBUG_TRANS,
"9p debug: virtio rpc deserialize returned %d\n", err);
return err;
}
static void p9_virtio_close(struct p9_trans *trans) #ifdef CONFIG_NET_9P_DEBUG
{ if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
struct virtio_chan *chan = trans->priv; char buf[150];
down(&virtio_9p_lock); p9_printfcall(buf, sizeof(buf), *rc, dotu);
chan->inuse = false; printk(KERN_NOTICE ">>> %p %s\n", t, buf);
up(&virtio_9p_lock); }
#endif
kfree(trans); if (n != P9_NOTAG && p9_idpool_check(n, chan->tagpool))
} p9_idpool_put(n, chan->tagpool);
static void p9_virtio_intr(struct virtqueue *q) req->status = REQ_STATUS_IDLE;
{
struct virtio_chan *chan = q->vdev->priv;
P9_DPRINTK(P9_DEBUG_TRANS, "9p poll_wakeup: %p\n", &chan->wq); return 0;
wake_up_interruptible(&chan->wq);
} }
static int p9_virtio_probe(struct virtio_device *dev) static int p9_virtio_probe(struct virtio_device *vdev)
{ {
int err; int err;
struct virtio_chan *chan; struct virtio_chan *chan;
...@@ -221,44 +302,29 @@ static int p9_virtio_probe(struct virtio_device *dev) ...@@ -221,44 +302,29 @@ static int p9_virtio_probe(struct virtio_device *dev)
if (chan_index > MAX_9P_CHAN) { if (chan_index > MAX_9P_CHAN) {
printk(KERN_ERR "9p: virtio: Maximum channels exceeded\n"); printk(KERN_ERR "9p: virtio: Maximum channels exceeded\n");
BUG(); BUG();
}
chan->vdev = dev;
/* This is the scratch page we use to receive console input */
chan->inbuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
if (!chan->inbuf) {
err = -ENOMEM; err = -ENOMEM;
goto fail; goto fail;
} }
/* Find the input queue. */ chan->vdev = vdev;
dev->priv = chan;
chan->in_vq = dev->config->find_vq(dev, 0, p9_virtio_intr);
if (IS_ERR(chan->in_vq)) {
err = PTR_ERR(chan->in_vq);
goto free;
}
chan->out_vq = dev->config->find_vq(dev, 1, NULL); /* We expect one virtqueue, for requests. */
if (IS_ERR(chan->out_vq)) { chan->vq = vdev->config->find_vq(vdev, 0, req_done);
err = PTR_ERR(chan->out_vq); if (IS_ERR(chan->vq)) {
goto free_in_vq; err = PTR_ERR(chan->vq);
goto out_free_vq;
} }
chan->vq->vdev->priv = chan;
spin_lock_init(&chan->lock);
init_waitqueue_head(&chan->wq); sg_init_table(chan->sg, VIRTQUEUE_NUM);
/* Register the input buffer the first time. */
add_inbuf(chan);
chan->inuse = false; chan->inuse = false;
chan->initialized = true; chan->initialized = true;
return 0; return 0;
free_in_vq: out_free_vq:
dev->config->del_vq(chan->in_vq); vdev->config->del_vq(chan->vq);
free:
kfree(chan->inbuf);
fail: fail:
down(&virtio_9p_lock); down(&virtio_9p_lock);
chan_index--; chan_index--;
...@@ -274,8 +340,8 @@ static int p9_virtio_probe(struct virtio_device *dev) ...@@ -274,8 +340,8 @@ static int p9_virtio_probe(struct virtio_device *dev)
static struct p9_trans *p9_virtio_create(const char *devname, char *args) static struct p9_trans *p9_virtio_create(const char *devname, char *args)
{ {
struct p9_trans *trans; struct p9_trans *trans;
int index = 0;
struct virtio_chan *chan = channels; struct virtio_chan *chan = channels;
int index = 0;
down(&virtio_9p_lock); down(&virtio_9p_lock);
while (index < MAX_9P_CHAN) { while (index < MAX_9P_CHAN) {
...@@ -290,9 +356,18 @@ static struct p9_trans *p9_virtio_create(const char *devname, char *args) ...@@ -290,9 +356,18 @@ static struct p9_trans *p9_virtio_create(const char *devname, char *args)
up(&virtio_9p_lock); up(&virtio_9p_lock);
if (index >= MAX_9P_CHAN) { if (index >= MAX_9P_CHAN) {
printk(KERN_ERR "9p: virtio: couldn't find a free channel\n"); printk(KERN_ERR "9p: no channels available\n");
return NULL; return ERR_PTR(-ENODEV);
}
chan->tagpool = p9_idpool_create();
if (IS_ERR(chan->tagpool)) {
printk(KERN_ERR "9p: couldn't allocate tagpool\n");
return ERR_PTR(-ENOMEM);
} }
p9_idpool_get(chan->tagpool); /* reserve tag 0 */
chan->max_tag = 0;
chan->reqs = NULL;
trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL);
if (!trans) { if (!trans) {
...@@ -304,6 +379,7 @@ static struct p9_trans *p9_virtio_create(const char *devname, char *args) ...@@ -304,6 +379,7 @@ static struct p9_trans *p9_virtio_create(const char *devname, char *args)
trans->read = p9_virtio_read; trans->read = p9_virtio_read;
trans->close = p9_virtio_close; trans->close = p9_virtio_close;
trans->poll = p9_virtio_poll; trans->poll = p9_virtio_poll;
trans->rpc = p9_virtio_rpc;
trans->priv = chan; trans->priv = chan;
return trans; return trans;
...@@ -327,7 +403,7 @@ static struct virtio_driver p9_virtio_drv = { ...@@ -327,7 +403,7 @@ static struct virtio_driver p9_virtio_drv = {
static struct p9_trans_module p9_virtio_trans = { static struct p9_trans_module p9_virtio_trans = {
.name = "virtio", .name = "virtio",
.create = p9_virtio_create, .create = p9_virtio_create,
.maxsize = PAGE_SIZE, .maxsize = PAGE_SIZE*16,
.def = 0, .def = 0,
}; };
......
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