[PATCH v2 1/2] net/9p: embed fcall in req to round down buffer allocs

From: Dominique Martinet
Date: Wed Aug 01 2018 - 23:03:18 EST

From: Dominique Martinet <dominique.martinet@xxxxxx>

'msize' is often a power of two, or at least page-aligned, so avoiding
an overhead of two dozen bytes for each allocation will help the
allocator do its work and reduce memory fragmentation.

Suggested-by: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Signed-off-by: Dominique Martinet <dominique.martinet@xxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Greg Kurz <groug@xxxxxxxx>
Cc: Jun Piao <piaojun@xxxxxxxxxx>
---

v2:
- Add extra label to not free uninitialized memory on alloc failure
- Rename p9_fcall_alloc to 9p_fcall_init
- Add a p9_fcall_fini function to echo to init

include/net/9p/client.h | 4 +-
net/9p/client.c | 166 ++++++++++++++++++++--------------------
net/9p/trans_fd.c | 12 +--
net/9p/trans_rdma.c | 29 +++----
net/9p/trans_virtio.c | 18 ++---
net/9p/trans_xen.c | 12 +--
6 files changed, 123 insertions(+), 118 deletions(-)

diff --git a/include/net/9p/client.h b/include/net/9p/client.h
index a4dc42c53d18..4b4ac1362ad5 100644
--- a/include/net/9p/client.h
+++ b/include/net/9p/client.h
@@ -95,8 +95,8 @@ struct p9_req_t {
int status;
int t_err;
wait_queue_head_t wq;
- struct p9_fcall *tc;
- struct p9_fcall *rc;
+ struct p9_fcall tc;
+ struct p9_fcall rc;
void *aux;
struct list_head req_list;
};
diff --git a/net/9p/client.c b/net/9p/client.c
index 88db45966740..bc40bb11b832 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -231,15 +231,18 @@ static int parse_opts(char *opts, struct p9_client *clnt)
return ret;
}

-static struct p9_fcall *p9_fcall_alloc(int alloc_msize)
+static int p9_fcall_init(struct p9_fcall *fc, int alloc_msize)
{
- struct p9_fcall *fc;
- fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS);
- if (!fc)
- return NULL;
+ fc->sdata = kmalloc(alloc_msize, GFP_NOFS);
+ if (!fc->sdata)
+ return -ENOMEM;
fc->capacity = alloc_msize;
- fc->sdata = (char *) fc + sizeof(struct p9_fcall);
- return fc;
+ return 0;
+}
+
+static void p9_fcall_fini(struct p9_fcall *fc)
+{
+ kfree(fc->sdata);
}

static struct kmem_cache *p9_req_cache;
@@ -263,13 +266,13 @@ p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size)
if (!req)
return NULL;

- req->tc = p9_fcall_alloc(alloc_msize);
- req->rc = p9_fcall_alloc(alloc_msize);
- if (!req->tc || !req->rc)
+ if (p9_fcall_init(&req->tc, alloc_msize))
+ goto free_req;
+ if (p9_fcall_init(&req->rc, alloc_msize))
goto free;

- p9pdu_reset(req->tc);
- p9pdu_reset(req->rc);
+ p9pdu_reset(&req->tc);
+ p9pdu_reset(&req->rc);
req->status = REQ_STATUS_ALLOC;
init_waitqueue_head(&req->wq);
INIT_LIST_HEAD(&req->req_list);
@@ -281,7 +284,7 @@ p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size)
GFP_NOWAIT);
else
tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT);
- req->tc->tag = tag;
+ req->tc.tag = tag;
spin_unlock_irq(&c->lock);
idr_preload_end();
if (tag < 0)
@@ -290,8 +293,9 @@ p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size)
return req;

free:
- kfree(req->tc);
- kfree(req->rc);
+ p9_fcall_fini(&req->tc);
+ p9_fcall_fini(&req->rc);
+free_req:
kmem_cache_free(p9_req_cache, req);
return ERR_PTR(-ENOMEM);
}
@@ -329,14 +333,14 @@ EXPORT_SYMBOL(p9_tag_lookup);
static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
{
unsigned long flags;
- u16 tag = r->tc->tag;
+ u16 tag = r->tc.tag;

p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
spin_lock_irqsave(&c->lock, flags);
idr_remove(&c->reqs, tag);
spin_unlock_irqrestore(&c->lock, flags);
- kfree(r->tc);
- kfree(r->rc);
+ p9_fcall_fini(&r->tc);
+ p9_fcall_fini(&r->rc);
kmem_cache_free(p9_req_cache, r);
}

@@ -368,7 +372,7 @@ static void p9_tag_cleanup(struct p9_client *c)
*/
void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
{
- p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
+ p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag);

/*
* This barrier is needed to make sure any change made to req before
@@ -378,7 +382,7 @@ void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
req->status = status;

wake_up(&req->wq);
- p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
+ p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag);
}
EXPORT_SYMBOL(p9_client_cb);

@@ -449,18 +453,18 @@ static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
int err;
int ecode;

- err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
- if (req->rc->size >= c->msize) {
+ err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
+ if (req->rc.size >= c->msize) {
p9_debug(P9_DEBUG_ERROR,
"requested packet size too big: %d\n",
- req->rc->size);
+ req->rc.size);
return -EIO;
}
/*
* dump the response from server
* This should be after check errors which poplulate pdu_fcall.
*/
- trace_9p_protocol_dump(c, req->rc);
+ trace_9p_protocol_dump(c, &req->rc);
if (err) {
p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
return err;
@@ -470,7 +474,7 @@ static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)

if (!p9_is_proto_dotl(c)) {
char *ename;
- err = p9pdu_readf(req->rc, c->proto_version, "s?d",
+ err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
&ename, &ecode);
if (err)
goto out_err;
@@ -486,7 +490,7 @@ static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
}
kfree(ename);
} else {
- err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
+ err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
err = -ecode;

p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
@@ -520,12 +524,12 @@ static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
int8_t type;
char *ename = NULL;

- err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
+ err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
/*
* dump the response from server
* This should be after parse_header which poplulate pdu_fcall.
*/
- trace_9p_protocol_dump(c, req->rc);
+ trace_9p_protocol_dump(c, &req->rc);
if (err) {
p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
return err;
@@ -540,13 +544,13 @@ static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
/* 7 = header size for RERROR; */
int inline_len = in_hdrlen - 7;

- len = req->rc->size - req->rc->offset;
+ len = req->rc.size - req->rc.offset;
if (len > (P9_ZC_HDR_SZ - 7)) {
err = -EFAULT;
goto out_err;
}

- ename = &req->rc->sdata[req->rc->offset];
+ ename = &req->rc.sdata[req->rc.offset];
if (len > inline_len) {
/* We have error in external buffer */
if (!copy_from_iter_full(ename + inline_len,
@@ -556,7 +560,7 @@ static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
}
}
ename = NULL;
- err = p9pdu_readf(req->rc, c->proto_version, "s?d",
+ err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
&ename, &ecode);
if (err)
goto out_err;
@@ -572,7 +576,7 @@ static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
}
kfree(ename);
} else {
- err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
+ err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
err = -ecode;

p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
@@ -605,7 +609,7 @@ static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
int16_t oldtag;
int err;

- err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
+ err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1);
if (err)
return err;

@@ -649,12 +653,12 @@ static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
return req;

/* marshall the data */
- p9pdu_prepare(req->tc, req->tc->tag, type);
- err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
+ p9pdu_prepare(&req->tc, req->tc.tag, type);
+ err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap);
if (err)
goto reterr;
- p9pdu_finalize(c, req->tc);
- trace_9p_client_req(c, type, req->tc->tag);
+ p9pdu_finalize(c, &req->tc);
+ trace_9p_client_req(c, type, req->tc.tag);
return req;
reterr:
p9_free_req(c, req);
@@ -739,7 +743,7 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
goto reterr;

err = p9_check_errors(c, req);
- trace_9p_client_res(c, type, req->rc->tag, err);
+ trace_9p_client_res(c, type, req->rc.tag, err);
if (!err)
return req;
reterr:
@@ -821,7 +825,7 @@ static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
goto reterr;

err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
- trace_9p_client_res(c, type, req->rc->tag, err);
+ trace_9p_client_res(c, type, req->rc.tag, err);
if (!err)
return req;
reterr:
@@ -904,10 +908,10 @@ static int p9_client_version(struct p9_client *c)
if (IS_ERR(req))
return PTR_ERR(req);

- err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
+ err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version);
if (err) {
p9_debug(P9_DEBUG_9P, "version error %d\n", err);
- trace_9p_protocol_dump(c, req->rc);
+ trace_9p_protocol_dump(c, &req->rc);
goto error;
}

@@ -1056,9 +1060,9 @@ struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
goto error;
}

- err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
+ err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid);
if (err) {
- trace_9p_protocol_dump(clnt, req->rc);
+ trace_9p_protocol_dump(clnt, &req->rc);
p9_free_req(clnt, req);
goto error;
}
@@ -1113,9 +1117,9 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
goto error;
}

- err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
+ err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids);
if (err) {
- trace_9p_protocol_dump(clnt, req->rc);
+ trace_9p_protocol_dump(clnt, &req->rc);
p9_free_req(clnt, req);
goto clunk_fid;
}
@@ -1180,9 +1184,9 @@ int p9_client_open(struct p9_fid *fid, int mode)
goto error;
}

- err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
+ err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
if (err) {
- trace_9p_protocol_dump(clnt, req->rc);
+ trace_9p_protocol_dump(clnt, &req->rc);
goto free_and_error;
}

@@ -1224,9 +1228,9 @@ int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32
goto error;
}

- err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
+ err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit);
if (err) {
- trace_9p_protocol_dump(clnt, req->rc);
+ trace_9p_protocol_dump(clnt, &req->rc);
goto free_and_error;
}

@@ -1269,9 +1273,9 @@ int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
goto error;
}

- err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
+ err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
if (err) {
- trace_9p_protocol_dump(clnt, req->rc);
+ trace_9p_protocol_dump(clnt, &req->rc);
goto free_and_error;
}

@@ -1308,9 +1312,9 @@ int p9_client_symlink(struct p9_fid *dfid, const char *name,
goto error;
}

- err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
+ err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
if (err) {
- trace_9p_protocol_dump(clnt, req->rc);
+ trace_9p_protocol_dump(clnt, &req->rc);
goto free_and_error;
}

@@ -1506,10 +1510,10 @@ p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
break;
}

- *err = p9pdu_readf(req->rc, clnt->proto_version,
+ *err = p9pdu_readf(&req->rc, clnt->proto_version,
"D", &count, &dataptr);
if (*err) {
- trace_9p_protocol_dump(clnt, req->rc);
+ trace_9p_protocol_dump(clnt, &req->rc);
p9_free_req(clnt, req);
break;
}
@@ -1579,9 +1583,9 @@ p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
break;
}

- *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
+ *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count);
if (*err) {
- trace_9p_protocol_dump(clnt, req->rc);
+ trace_9p_protocol_dump(clnt, &req->rc);
p9_free_req(clnt, req);
break;
}
@@ -1623,9 +1627,9 @@ struct p9_wstat *p9_client_stat(struct p9_fid *fid)
goto error;
}

- err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
+ err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret);
if (err) {
- trace_9p_protocol_dump(clnt, req->rc);
+ trace_9p_protocol_dump(clnt, &req->rc);
p9_free_req(clnt, req);
goto error;
}
@@ -1676,9 +1680,9 @@ struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
goto error;
}

- err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
+ err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret);
if (err) {
- trace_9p_protocol_dump(clnt, req->rc);
+ trace_9p_protocol_dump(clnt, &req->rc);
p9_free_req(clnt, req);
goto error;
}
@@ -1828,11 +1832,11 @@ int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
goto error;
}

- err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
- &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
- &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
+ err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
+ &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
+ &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
if (err) {
- trace_9p_protocol_dump(clnt, req->rc);
+ trace_9p_protocol_dump(clnt, &req->rc);
p9_free_req(clnt, req);
goto error;
}
@@ -1936,9 +1940,9 @@ struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
err = PTR_ERR(req);
goto error;
}
- err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
+ err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size);
if (err) {
- trace_9p_protocol_dump(clnt, req->rc);
+ trace_9p_protocol_dump(clnt, &req->rc);
p9_free_req(clnt, req);
goto clunk_fid;
}
@@ -2024,9 +2028,9 @@ int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
goto error;
}

- err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
+ err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr);
if (err) {
- trace_9p_protocol_dump(clnt, req->rc);
+ trace_9p_protocol_dump(clnt, &req->rc);
goto free_and_error;
}
if (rsize < count) {
@@ -2065,9 +2069,9 @@ int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
if (IS_ERR(req))
return PTR_ERR(req);

- err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
+ err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
if (err) {
- trace_9p_protocol_dump(clnt, req->rc);
+ trace_9p_protocol_dump(clnt, &req->rc);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
@@ -2096,9 +2100,9 @@ int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
if (IS_ERR(req))
return PTR_ERR(req);

- err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
+ err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
if (err) {
- trace_9p_protocol_dump(clnt, req->rc);
+ trace_9p_protocol_dump(clnt, &req->rc);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
@@ -2131,9 +2135,9 @@ int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
if (IS_ERR(req))
return PTR_ERR(req);

- err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
+ err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status);
if (err) {
- trace_9p_protocol_dump(clnt, req->rc);
+ trace_9p_protocol_dump(clnt, &req->rc);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
@@ -2162,11 +2166,11 @@ int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
if (IS_ERR(req))
return PTR_ERR(req);

- err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
- &glock->start, &glock->length, &glock->proc_id,
- &glock->client_id);
+ err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type,
+ &glock->start, &glock->length, &glock->proc_id,
+ &glock->client_id);
if (err) {
- trace_9p_protocol_dump(clnt, req->rc);
+ trace_9p_protocol_dump(clnt, &req->rc);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
@@ -2192,9 +2196,9 @@ int p9_client_readlink(struct p9_fid *fid, char **target)
if (IS_ERR(req))
return PTR_ERR(req);

- err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
+ err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target);
if (err) {
- trace_9p_protocol_dump(clnt, req->rc);
+ trace_9p_protocol_dump(clnt, &req->rc);
goto error;
}
p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index e2ef3c782c53..20f46f13fe83 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -354,7 +354,7 @@ static void p9_read_work(struct work_struct *work)
goto error;
}

- if (m->req->rc == NULL) {
+ if (m->req->rc.sdata == NULL) {
p9_debug(P9_DEBUG_ERROR,
"No recv fcall for tag %d (req %p), disconnecting!\n",
m->rc.tag, m->req);
@@ -362,7 +362,7 @@ static void p9_read_work(struct work_struct *work)
err = -EIO;
goto error;
}
- m->rc.sdata = (char *)m->req->rc + sizeof(struct p9_fcall);
+ m->rc.sdata = m->req->rc.sdata;
memcpy(m->rc.sdata, m->tmp_buf, m->rc.capacity);
m->rc.capacity = m->rc.size;
}
@@ -372,7 +372,7 @@ static void p9_read_work(struct work_struct *work)
*/
if ((m->req) && (m->rc.offset == m->rc.capacity)) {
p9_debug(P9_DEBUG_TRANS, "got new packet\n");
- m->req->rc->size = m->rc.offset;
+ m->req->rc.size = m->rc.offset;
spin_lock(&m->client->lock);
if (m->req->status != REQ_STATUS_ERROR)
status = REQ_STATUS_RCVD;
@@ -469,8 +469,8 @@ static void p9_write_work(struct work_struct *work)
p9_debug(P9_DEBUG_TRANS, "move req %p\n", req);
list_move_tail(&req->req_list, &m->req_list);

- m->wbuf = req->tc->sdata;
- m->wsize = req->tc->size;
+ m->wbuf = req->tc.sdata;
+ m->wsize = req->tc.size;
m->wpos = 0;
spin_unlock(&m->client->lock);
}
@@ -663,7 +663,7 @@ static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
struct p9_conn *m = &ts->conn;

p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n",
- m, current, req->tc, req->tc->id);
+ m, current, &req->tc, req->tc.id);
if (m->err < 0)
return m->err;

diff --git a/net/9p/trans_rdma.c b/net/9p/trans_rdma.c
index 2ab4574183c9..c5cac97df7f7 100644
--- a/net/9p/trans_rdma.c
+++ b/net/9p/trans_rdma.c
@@ -122,7 +122,7 @@ struct p9_rdma_context {
dma_addr_t busa;
union {
struct p9_req_t *req;
- struct p9_fcall *rc;
+ struct p9_fcall rc;
};
};

@@ -320,8 +320,8 @@ recv_done(struct ib_cq *cq, struct ib_wc *wc)
if (wc->status != IB_WC_SUCCESS)
goto err_out;

- c->rc->size = wc->byte_len;
- err = p9_parse_header(c->rc, NULL, NULL, &tag, 1);
+ c->rc.size = wc->byte_len;
+ err = p9_parse_header(&c->rc, NULL, NULL, &tag, 1);
if (err)
goto err_out;

@@ -331,12 +331,13 @@ recv_done(struct ib_cq *cq, struct ib_wc *wc)

/* Check that we have not yet received a reply for this request.
*/
- if (unlikely(req->rc)) {
+ if (unlikely(req->rc.sdata)) {
pr_err("Duplicate reply for request %d", tag);
goto err_out;
}

- req->rc = c->rc;
+ req->rc.size = c->rc.size;
+ req->rc.sdata = c->rc.sdata;
p9_client_cb(client, req, REQ_STATUS_RCVD);

out:
@@ -361,7 +362,7 @@ send_done(struct ib_cq *cq, struct ib_wc *wc)
container_of(wc->wr_cqe, struct p9_rdma_context, cqe);

ib_dma_unmap_single(rdma->cm_id->device,
- c->busa, c->req->tc->size,
+ c->busa, c->req->tc.size,
DMA_TO_DEVICE);
up(&rdma->sq_sem);
kfree(c);
@@ -401,7 +402,7 @@ post_recv(struct p9_client *client, struct p9_rdma_context *c)
struct ib_sge sge;

c->busa = ib_dma_map_single(rdma->cm_id->device,
- c->rc->sdata, client->msize,
+ c->rc.sdata, client->msize,
DMA_FROM_DEVICE);
if (ib_dma_mapping_error(rdma->cm_id->device, c->busa))
goto error;
@@ -443,9 +444,9 @@ static int rdma_request(struct p9_client *client, struct p9_req_t *req)
**/
if (unlikely(atomic_read(&rdma->excess_rc) > 0)) {
if ((atomic_sub_return(1, &rdma->excess_rc) >= 0)) {
- /* Got one ! */
- kfree(req->rc);
- req->rc = NULL;
+ /* Got one! */
+ kfree(req->rc.sdata);
+ req->rc.sdata = NULL;
goto dont_need_post_recv;
} else {
/* We raced and lost. */
@@ -459,7 +460,7 @@ static int rdma_request(struct p9_client *client, struct p9_req_t *req)
err = -ENOMEM;
goto recv_error;
}
- rpl_context->rc = req->rc;
+ rpl_context->rc.sdata = req->rc.sdata;

/*
* Post a receive buffer for this request. We need to ensure
@@ -479,7 +480,7 @@ static int rdma_request(struct p9_client *client, struct p9_req_t *req)
goto recv_error;
}
/* remove posted receive buffer from request structure */
- req->rc = NULL;
+ req->rc.sdata = NULL;

dont_need_post_recv:
/* Post the request */
@@ -491,7 +492,7 @@ static int rdma_request(struct p9_client *client, struct p9_req_t *req)
c->req = req;

c->busa = ib_dma_map_single(rdma->cm_id->device,
- c->req->tc->sdata, c->req->tc->size,
+ c->req->tc.sdata, c->req->tc.size,
DMA_TO_DEVICE);
if (ib_dma_mapping_error(rdma->cm_id->device, c->busa)) {
err = -EIO;
@@ -501,7 +502,7 @@ static int rdma_request(struct p9_client *client, struct p9_req_t *req)
c->cqe.done = send_done;

sge.addr = c->busa;
- sge.length = c->req->tc->size;
+ sge.length = c->req->tc.size;
sge.lkey = rdma->pd->local_dma_lkey;

wr.next = NULL;
diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 6265d1d62749..80dd34d8a6af 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -157,7 +157,7 @@ static void req_done(struct virtqueue *vq)
}

if (len) {
- req->rc->size = len;
+ req->rc.size = len;
p9_client_cb(chan->client, req, REQ_STATUS_RCVD);
}
}
@@ -274,12 +274,12 @@ p9_virtio_request(struct p9_client *client, struct p9_req_t *req)
out_sgs = in_sgs = 0;
/* Handle out VirtIO ring buffers */
out = pack_sg_list(chan->sg, 0,
- VIRTQUEUE_NUM, req->tc->sdata, req->tc->size);
+ VIRTQUEUE_NUM, req->tc.sdata, req->tc.size);
if (out)
sgs[out_sgs++] = chan->sg;

in = pack_sg_list(chan->sg, out,
- VIRTQUEUE_NUM, req->rc->sdata, req->rc->capacity);
+ VIRTQUEUE_NUM, req->rc.sdata, req->rc.capacity);
if (in)
sgs[out_sgs + in_sgs++] = chan->sg + out;

@@ -417,15 +417,15 @@ p9_virtio_zc_request(struct p9_client *client, struct p9_req_t *req,
out_nr_pages = DIV_ROUND_UP(n + offs, PAGE_SIZE);
if (n != outlen) {
__le32 v = cpu_to_le32(n);
- memcpy(&req->tc->sdata[req->tc->size - 4], &v, 4);
+ memcpy(&req->tc.sdata[req->tc.size - 4], &v, 4);
outlen = n;
}
/* The size field of the message must include the length of the
* header and the length of the data. We didn't actually know
* the length of the data until this point so add it in now.
*/
- sz = cpu_to_le32(req->tc->size + outlen);
- memcpy(&req->tc->sdata[0], &sz, sizeof(sz));
+ sz = cpu_to_le32(req->tc.size + outlen);
+ memcpy(&req->tc.sdata[0], &sz, sizeof(sz));
} else if (uidata) {
int n = p9_get_mapped_pages(chan, &in_pages, uidata,
inlen, &offs, &need_drop);
@@ -434,7 +434,7 @@ p9_virtio_zc_request(struct p9_client *client, struct p9_req_t *req,
in_nr_pages = DIV_ROUND_UP(n + offs, PAGE_SIZE);
if (n != inlen) {
__le32 v = cpu_to_le32(n);
- memcpy(&req->tc->sdata[req->tc->size - 4], &v, 4);
+ memcpy(&req->tc.sdata[req->tc.size - 4], &v, 4);
inlen = n;
}
}
@@ -446,7 +446,7 @@ p9_virtio_zc_request(struct p9_client *client, struct p9_req_t *req,

/* out data */
out = pack_sg_list(chan->sg, 0,
- VIRTQUEUE_NUM, req->tc->sdata, req->tc->size);
+ VIRTQUEUE_NUM, req->tc.sdata, req->tc.size);

if (out)
sgs[out_sgs++] = chan->sg;
@@ -465,7 +465,7 @@ p9_virtio_zc_request(struct p9_client *client, struct p9_req_t *req,
* alloced memory and payload onto the user buffer.
*/
in = pack_sg_list(chan->sg, out,
- VIRTQUEUE_NUM, req->rc->sdata, in_hdr_len);
+ VIRTQUEUE_NUM, req->rc.sdata, in_hdr_len);
if (in)
sgs[out_sgs + in_sgs++] = chan->sg + out;

diff --git a/net/9p/trans_xen.c b/net/9p/trans_xen.c
index c2d54ac76bfd..1a5b38892eb4 100644
--- a/net/9p/trans_xen.c
+++ b/net/9p/trans_xen.c
@@ -141,7 +141,7 @@ static int p9_xen_request(struct p9_client *client, struct p9_req_t *p9_req)
struct xen_9pfs_front_priv *priv = NULL;
RING_IDX cons, prod, masked_cons, masked_prod;
unsigned long flags;
- u32 size = p9_req->tc->size;
+ u32 size = p9_req->tc.size;
struct xen_9pfs_dataring *ring;
int num;

@@ -154,7 +154,7 @@ static int p9_xen_request(struct p9_client *client, struct p9_req_t *p9_req)
if (!priv || priv->client != client)
return -EINVAL;

- num = p9_req->tc->tag % priv->num_rings;
+ num = p9_req->tc.tag % priv->num_rings;
ring = &priv->rings[num];

again:
@@ -176,7 +176,7 @@ static int p9_xen_request(struct p9_client *client, struct p9_req_t *p9_req)
masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE);
masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);

- xen_9pfs_write_packet(ring->data.out, p9_req->tc->sdata, size,
+ xen_9pfs_write_packet(ring->data.out, p9_req->tc.sdata, size,
&masked_prod, masked_cons, XEN_9PFS_RING_SIZE);

p9_req->status = REQ_STATUS_SENT;
@@ -229,12 +229,12 @@ static void p9_xen_response(struct work_struct *work)
continue;
}

- memcpy(req->rc, &h, sizeof(h));
- req->rc->offset = 0;
+ memcpy(&req->rc, &h, sizeof(h));
+ req->rc.offset = 0;

masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
/* Then, read the whole packet (including the header) */
- xen_9pfs_read_packet(req->rc->sdata, ring->data.in, h.size,
+ xen_9pfs_read_packet(req->rc.sdata, ring->data.in, h.size,
masked_prod, &masked_cons,
XEN_9PFS_RING_SIZE);

--
2.17.1