mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![shamir rabinovitch](/assets/img/avatar_default.png)
per comment from Leon in rdma mailing list https://lkml.org/lkml/2018/10/31/312 : Please don't forget to remove user triggered WARN_ON. https://lwn.net/Articles/769365/ "Greg Kroah-Hartman raised the problem of core kernel API code that will use WARN_ON_ONCE() to complain about bad usage; that will not generate the desired result if WARN_ON_ONCE() is configured to crash the machine. He was told that the code should just call pr_warn() instead, and that the called function should return an error in such situations. It was generally agreed that any WARN_ON() or WARN_ON_ONCE() calls that can be triggered from user space need to be fixed." in addition harden rds_sendmsg to detect and overcome issues with invalid sg count and fail the sendmsg. Suggested-by: Leon Romanovsky <leon@kernel.org> Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com> Signed-off-by: shamir rabinovitch <shamir.rabinovitch@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
884 lines
23 KiB
C
884 lines
23 KiB
C
/*
|
|
* Copyright (c) 2007, 2017 Oracle and/or its affiliates. All rights reserved.
|
|
*
|
|
* This software is available to you under a choice of one of two
|
|
* licenses. You may choose to be licensed under the terms of the GNU
|
|
* General Public License (GPL) Version 2, available from the file
|
|
* COPYING in the main directory of this source tree, or the
|
|
* OpenIB.org BSD license below:
|
|
*
|
|
* Redistribution and use in source and binary forms, with or
|
|
* without modification, are permitted provided that the following
|
|
* conditions are met:
|
|
*
|
|
* - Redistributions of source code must retain the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer.
|
|
*
|
|
* - Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials
|
|
* provided with the distribution.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*
|
|
*/
|
|
#include <linux/pagemap.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/rbtree.h>
|
|
#include <linux/dma-mapping.h> /* for DMA_*_DEVICE */
|
|
|
|
#include "rds.h"
|
|
|
|
/*
|
|
* XXX
|
|
* - build with sparse
|
|
* - should we detect duplicate keys on a socket? hmm.
|
|
* - an rdma is an mlock, apply rlimit?
|
|
*/
|
|
|
|
/*
|
|
* get the number of pages by looking at the page indices that the start and
|
|
* end addresses fall in.
|
|
*
|
|
* Returns 0 if the vec is invalid. It is invalid if the number of bytes
|
|
* causes the address to wrap or overflows an unsigned int. This comes
|
|
* from being stored in the 'length' member of 'struct scatterlist'.
|
|
*/
|
|
static unsigned int rds_pages_in_vec(struct rds_iovec *vec)
|
|
{
|
|
if ((vec->addr + vec->bytes <= vec->addr) ||
|
|
(vec->bytes > (u64)UINT_MAX))
|
|
return 0;
|
|
|
|
return ((vec->addr + vec->bytes + PAGE_SIZE - 1) >> PAGE_SHIFT) -
|
|
(vec->addr >> PAGE_SHIFT);
|
|
}
|
|
|
|
static struct rds_mr *rds_mr_tree_walk(struct rb_root *root, u64 key,
|
|
struct rds_mr *insert)
|
|
{
|
|
struct rb_node **p = &root->rb_node;
|
|
struct rb_node *parent = NULL;
|
|
struct rds_mr *mr;
|
|
|
|
while (*p) {
|
|
parent = *p;
|
|
mr = rb_entry(parent, struct rds_mr, r_rb_node);
|
|
|
|
if (key < mr->r_key)
|
|
p = &(*p)->rb_left;
|
|
else if (key > mr->r_key)
|
|
p = &(*p)->rb_right;
|
|
else
|
|
return mr;
|
|
}
|
|
|
|
if (insert) {
|
|
rb_link_node(&insert->r_rb_node, parent, p);
|
|
rb_insert_color(&insert->r_rb_node, root);
|
|
refcount_inc(&insert->r_refcount);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Destroy the transport-specific part of a MR.
|
|
*/
|
|
static void rds_destroy_mr(struct rds_mr *mr)
|
|
{
|
|
struct rds_sock *rs = mr->r_sock;
|
|
void *trans_private = NULL;
|
|
unsigned long flags;
|
|
|
|
rdsdebug("RDS: destroy mr key is %x refcnt %u\n",
|
|
mr->r_key, refcount_read(&mr->r_refcount));
|
|
|
|
if (test_and_set_bit(RDS_MR_DEAD, &mr->r_state))
|
|
return;
|
|
|
|
spin_lock_irqsave(&rs->rs_rdma_lock, flags);
|
|
if (!RB_EMPTY_NODE(&mr->r_rb_node))
|
|
rb_erase(&mr->r_rb_node, &rs->rs_rdma_keys);
|
|
trans_private = mr->r_trans_private;
|
|
mr->r_trans_private = NULL;
|
|
spin_unlock_irqrestore(&rs->rs_rdma_lock, flags);
|
|
|
|
if (trans_private)
|
|
mr->r_trans->free_mr(trans_private, mr->r_invalidate);
|
|
}
|
|
|
|
void __rds_put_mr_final(struct rds_mr *mr)
|
|
{
|
|
rds_destroy_mr(mr);
|
|
kfree(mr);
|
|
}
|
|
|
|
/*
|
|
* By the time this is called we can't have any more ioctls called on
|
|
* the socket so we don't need to worry about racing with others.
|
|
*/
|
|
void rds_rdma_drop_keys(struct rds_sock *rs)
|
|
{
|
|
struct rds_mr *mr;
|
|
struct rb_node *node;
|
|
unsigned long flags;
|
|
|
|
/* Release any MRs associated with this socket */
|
|
spin_lock_irqsave(&rs->rs_rdma_lock, flags);
|
|
while ((node = rb_first(&rs->rs_rdma_keys))) {
|
|
mr = rb_entry(node, struct rds_mr, r_rb_node);
|
|
if (mr->r_trans == rs->rs_transport)
|
|
mr->r_invalidate = 0;
|
|
rb_erase(&mr->r_rb_node, &rs->rs_rdma_keys);
|
|
RB_CLEAR_NODE(&mr->r_rb_node);
|
|
spin_unlock_irqrestore(&rs->rs_rdma_lock, flags);
|
|
rds_destroy_mr(mr);
|
|
rds_mr_put(mr);
|
|
spin_lock_irqsave(&rs->rs_rdma_lock, flags);
|
|
}
|
|
spin_unlock_irqrestore(&rs->rs_rdma_lock, flags);
|
|
|
|
if (rs->rs_transport && rs->rs_transport->flush_mrs)
|
|
rs->rs_transport->flush_mrs();
|
|
}
|
|
|
|
/*
|
|
* Helper function to pin user pages.
|
|
*/
|
|
static int rds_pin_pages(unsigned long user_addr, unsigned int nr_pages,
|
|
struct page **pages, int write)
|
|
{
|
|
int ret;
|
|
|
|
ret = get_user_pages_fast(user_addr, nr_pages, write, pages);
|
|
|
|
if (ret >= 0 && ret < nr_pages) {
|
|
while (ret--)
|
|
put_page(pages[ret]);
|
|
ret = -EFAULT;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __rds_rdma_map(struct rds_sock *rs, struct rds_get_mr_args *args,
|
|
u64 *cookie_ret, struct rds_mr **mr_ret,
|
|
struct rds_conn_path *cp)
|
|
{
|
|
struct rds_mr *mr = NULL, *found;
|
|
unsigned int nr_pages;
|
|
struct page **pages = NULL;
|
|
struct scatterlist *sg;
|
|
void *trans_private;
|
|
unsigned long flags;
|
|
rds_rdma_cookie_t cookie;
|
|
unsigned int nents;
|
|
long i;
|
|
int ret;
|
|
|
|
if (ipv6_addr_any(&rs->rs_bound_addr) || !rs->rs_transport) {
|
|
ret = -ENOTCONN; /* XXX not a great errno */
|
|
goto out;
|
|
}
|
|
|
|
if (!rs->rs_transport->get_mr) {
|
|
ret = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
nr_pages = rds_pages_in_vec(&args->vec);
|
|
if (nr_pages == 0) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Restrict the size of mr irrespective of underlying transport
|
|
* To account for unaligned mr regions, subtract one from nr_pages
|
|
*/
|
|
if ((nr_pages - 1) > (RDS_MAX_MSG_SIZE >> PAGE_SHIFT)) {
|
|
ret = -EMSGSIZE;
|
|
goto out;
|
|
}
|
|
|
|
rdsdebug("RDS: get_mr addr %llx len %llu nr_pages %u\n",
|
|
args->vec.addr, args->vec.bytes, nr_pages);
|
|
|
|
/* XXX clamp nr_pages to limit the size of this alloc? */
|
|
pages = kcalloc(nr_pages, sizeof(struct page *), GFP_KERNEL);
|
|
if (!pages) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
mr = kzalloc(sizeof(struct rds_mr), GFP_KERNEL);
|
|
if (!mr) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
refcount_set(&mr->r_refcount, 1);
|
|
RB_CLEAR_NODE(&mr->r_rb_node);
|
|
mr->r_trans = rs->rs_transport;
|
|
mr->r_sock = rs;
|
|
|
|
if (args->flags & RDS_RDMA_USE_ONCE)
|
|
mr->r_use_once = 1;
|
|
if (args->flags & RDS_RDMA_INVALIDATE)
|
|
mr->r_invalidate = 1;
|
|
if (args->flags & RDS_RDMA_READWRITE)
|
|
mr->r_write = 1;
|
|
|
|
/*
|
|
* Pin the pages that make up the user buffer and transfer the page
|
|
* pointers to the mr's sg array. We check to see if we've mapped
|
|
* the whole region after transferring the partial page references
|
|
* to the sg array so that we can have one page ref cleanup path.
|
|
*
|
|
* For now we have no flag that tells us whether the mapping is
|
|
* r/o or r/w. We need to assume r/w, or we'll do a lot of RDMA to
|
|
* the zero page.
|
|
*/
|
|
ret = rds_pin_pages(args->vec.addr, nr_pages, pages, 1);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
nents = ret;
|
|
sg = kcalloc(nents, sizeof(*sg), GFP_KERNEL);
|
|
if (!sg) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
WARN_ON(!nents);
|
|
sg_init_table(sg, nents);
|
|
|
|
/* Stick all pages into the scatterlist */
|
|
for (i = 0 ; i < nents; i++)
|
|
sg_set_page(&sg[i], pages[i], PAGE_SIZE, 0);
|
|
|
|
rdsdebug("RDS: trans_private nents is %u\n", nents);
|
|
|
|
/* Obtain a transport specific MR. If this succeeds, the
|
|
* s/g list is now owned by the MR.
|
|
* Note that dma_map() implies that pending writes are
|
|
* flushed to RAM, so no dma_sync is needed here. */
|
|
trans_private = rs->rs_transport->get_mr(sg, nents, rs,
|
|
&mr->r_key,
|
|
cp ? cp->cp_conn : NULL);
|
|
|
|
if (IS_ERR(trans_private)) {
|
|
for (i = 0 ; i < nents; i++)
|
|
put_page(sg_page(&sg[i]));
|
|
kfree(sg);
|
|
ret = PTR_ERR(trans_private);
|
|
goto out;
|
|
}
|
|
|
|
mr->r_trans_private = trans_private;
|
|
|
|
rdsdebug("RDS: get_mr put_user key is %x cookie_addr %p\n",
|
|
mr->r_key, (void *)(unsigned long) args->cookie_addr);
|
|
|
|
/* The user may pass us an unaligned address, but we can only
|
|
* map page aligned regions. So we keep the offset, and build
|
|
* a 64bit cookie containing <R_Key, offset> and pass that
|
|
* around. */
|
|
cookie = rds_rdma_make_cookie(mr->r_key, args->vec.addr & ~PAGE_MASK);
|
|
if (cookie_ret)
|
|
*cookie_ret = cookie;
|
|
|
|
if (args->cookie_addr && put_user(cookie, (u64 __user *)(unsigned long) args->cookie_addr)) {
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
/* Inserting the new MR into the rbtree bumps its
|
|
* reference count. */
|
|
spin_lock_irqsave(&rs->rs_rdma_lock, flags);
|
|
found = rds_mr_tree_walk(&rs->rs_rdma_keys, mr->r_key, mr);
|
|
spin_unlock_irqrestore(&rs->rs_rdma_lock, flags);
|
|
|
|
BUG_ON(found && found != mr);
|
|
|
|
rdsdebug("RDS: get_mr key is %x\n", mr->r_key);
|
|
if (mr_ret) {
|
|
refcount_inc(&mr->r_refcount);
|
|
*mr_ret = mr;
|
|
}
|
|
|
|
ret = 0;
|
|
out:
|
|
kfree(pages);
|
|
if (mr)
|
|
rds_mr_put(mr);
|
|
return ret;
|
|
}
|
|
|
|
int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen)
|
|
{
|
|
struct rds_get_mr_args args;
|
|
|
|
if (optlen != sizeof(struct rds_get_mr_args))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&args, (struct rds_get_mr_args __user *)optval,
|
|
sizeof(struct rds_get_mr_args)))
|
|
return -EFAULT;
|
|
|
|
return __rds_rdma_map(rs, &args, NULL, NULL, NULL);
|
|
}
|
|
|
|
int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen)
|
|
{
|
|
struct rds_get_mr_for_dest_args args;
|
|
struct rds_get_mr_args new_args;
|
|
|
|
if (optlen != sizeof(struct rds_get_mr_for_dest_args))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&args, (struct rds_get_mr_for_dest_args __user *)optval,
|
|
sizeof(struct rds_get_mr_for_dest_args)))
|
|
return -EFAULT;
|
|
|
|
/*
|
|
* Initially, just behave like get_mr().
|
|
* TODO: Implement get_mr as wrapper around this
|
|
* and deprecate it.
|
|
*/
|
|
new_args.vec = args.vec;
|
|
new_args.cookie_addr = args.cookie_addr;
|
|
new_args.flags = args.flags;
|
|
|
|
return __rds_rdma_map(rs, &new_args, NULL, NULL, NULL);
|
|
}
|
|
|
|
/*
|
|
* Free the MR indicated by the given R_Key
|
|
*/
|
|
int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen)
|
|
{
|
|
struct rds_free_mr_args args;
|
|
struct rds_mr *mr;
|
|
unsigned long flags;
|
|
|
|
if (optlen != sizeof(struct rds_free_mr_args))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&args, (struct rds_free_mr_args __user *)optval,
|
|
sizeof(struct rds_free_mr_args)))
|
|
return -EFAULT;
|
|
|
|
/* Special case - a null cookie means flush all unused MRs */
|
|
if (args.cookie == 0) {
|
|
if (!rs->rs_transport || !rs->rs_transport->flush_mrs)
|
|
return -EINVAL;
|
|
rs->rs_transport->flush_mrs();
|
|
return 0;
|
|
}
|
|
|
|
/* Look up the MR given its R_key and remove it from the rbtree
|
|
* so nobody else finds it.
|
|
* This should also prevent races with rds_rdma_unuse.
|
|
*/
|
|
spin_lock_irqsave(&rs->rs_rdma_lock, flags);
|
|
mr = rds_mr_tree_walk(&rs->rs_rdma_keys, rds_rdma_cookie_key(args.cookie), NULL);
|
|
if (mr) {
|
|
rb_erase(&mr->r_rb_node, &rs->rs_rdma_keys);
|
|
RB_CLEAR_NODE(&mr->r_rb_node);
|
|
if (args.flags & RDS_RDMA_INVALIDATE)
|
|
mr->r_invalidate = 1;
|
|
}
|
|
spin_unlock_irqrestore(&rs->rs_rdma_lock, flags);
|
|
|
|
if (!mr)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* call rds_destroy_mr() ourselves so that we're sure it's done by the time
|
|
* we return. If we let rds_mr_put() do it it might not happen until
|
|
* someone else drops their ref.
|
|
*/
|
|
rds_destroy_mr(mr);
|
|
rds_mr_put(mr);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This is called when we receive an extension header that
|
|
* tells us this MR was used. It allows us to implement
|
|
* use_once semantics
|
|
*/
|
|
void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force)
|
|
{
|
|
struct rds_mr *mr;
|
|
unsigned long flags;
|
|
int zot_me = 0;
|
|
|
|
spin_lock_irqsave(&rs->rs_rdma_lock, flags);
|
|
mr = rds_mr_tree_walk(&rs->rs_rdma_keys, r_key, NULL);
|
|
if (!mr) {
|
|
pr_debug("rds: trying to unuse MR with unknown r_key %u!\n",
|
|
r_key);
|
|
spin_unlock_irqrestore(&rs->rs_rdma_lock, flags);
|
|
return;
|
|
}
|
|
|
|
if (mr->r_use_once || force) {
|
|
rb_erase(&mr->r_rb_node, &rs->rs_rdma_keys);
|
|
RB_CLEAR_NODE(&mr->r_rb_node);
|
|
zot_me = 1;
|
|
}
|
|
spin_unlock_irqrestore(&rs->rs_rdma_lock, flags);
|
|
|
|
/* May have to issue a dma_sync on this memory region.
|
|
* Note we could avoid this if the operation was a RDMA READ,
|
|
* but at this point we can't tell. */
|
|
if (mr->r_trans->sync_mr)
|
|
mr->r_trans->sync_mr(mr->r_trans_private, DMA_FROM_DEVICE);
|
|
|
|
/* If the MR was marked as invalidate, this will
|
|
* trigger an async flush. */
|
|
if (zot_me) {
|
|
rds_destroy_mr(mr);
|
|
rds_mr_put(mr);
|
|
}
|
|
}
|
|
|
|
void rds_rdma_free_op(struct rm_rdma_op *ro)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < ro->op_nents; i++) {
|
|
struct page *page = sg_page(&ro->op_sg[i]);
|
|
|
|
/* Mark page dirty if it was possibly modified, which
|
|
* is the case for a RDMA_READ which copies from remote
|
|
* to local memory */
|
|
if (!ro->op_write) {
|
|
WARN_ON(!page->mapping && irqs_disabled());
|
|
set_page_dirty(page);
|
|
}
|
|
put_page(page);
|
|
}
|
|
|
|
kfree(ro->op_notifier);
|
|
ro->op_notifier = NULL;
|
|
ro->op_active = 0;
|
|
}
|
|
|
|
void rds_atomic_free_op(struct rm_atomic_op *ao)
|
|
{
|
|
struct page *page = sg_page(ao->op_sg);
|
|
|
|
/* Mark page dirty if it was possibly modified, which
|
|
* is the case for a RDMA_READ which copies from remote
|
|
* to local memory */
|
|
set_page_dirty(page);
|
|
put_page(page);
|
|
|
|
kfree(ao->op_notifier);
|
|
ao->op_notifier = NULL;
|
|
ao->op_active = 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Count the number of pages needed to describe an incoming iovec array.
|
|
*/
|
|
static int rds_rdma_pages(struct rds_iovec iov[], int nr_iovecs)
|
|
{
|
|
int tot_pages = 0;
|
|
unsigned int nr_pages;
|
|
unsigned int i;
|
|
|
|
/* figure out the number of pages in the vector */
|
|
for (i = 0; i < nr_iovecs; i++) {
|
|
nr_pages = rds_pages_in_vec(&iov[i]);
|
|
if (nr_pages == 0)
|
|
return -EINVAL;
|
|
|
|
tot_pages += nr_pages;
|
|
|
|
/*
|
|
* nr_pages for one entry is limited to (UINT_MAX>>PAGE_SHIFT)+1,
|
|
* so tot_pages cannot overflow without first going negative.
|
|
*/
|
|
if (tot_pages < 0)
|
|
return -EINVAL;
|
|
}
|
|
|
|
return tot_pages;
|
|
}
|
|
|
|
int rds_rdma_extra_size(struct rds_rdma_args *args,
|
|
struct rds_iov_vector *iov)
|
|
{
|
|
struct rds_iovec *vec;
|
|
struct rds_iovec __user *local_vec;
|
|
int tot_pages = 0;
|
|
unsigned int nr_pages;
|
|
unsigned int i;
|
|
|
|
local_vec = (struct rds_iovec __user *)(unsigned long) args->local_vec_addr;
|
|
|
|
if (args->nr_local == 0)
|
|
return -EINVAL;
|
|
|
|
iov->iov = kcalloc(args->nr_local,
|
|
sizeof(struct rds_iovec),
|
|
GFP_KERNEL);
|
|
if (!iov->iov)
|
|
return -ENOMEM;
|
|
|
|
vec = &iov->iov[0];
|
|
|
|
if (copy_from_user(vec, local_vec, args->nr_local *
|
|
sizeof(struct rds_iovec)))
|
|
return -EFAULT;
|
|
iov->len = args->nr_local;
|
|
|
|
/* figure out the number of pages in the vector */
|
|
for (i = 0; i < args->nr_local; i++, vec++) {
|
|
|
|
nr_pages = rds_pages_in_vec(vec);
|
|
if (nr_pages == 0)
|
|
return -EINVAL;
|
|
|
|
tot_pages += nr_pages;
|
|
|
|
/*
|
|
* nr_pages for one entry is limited to (UINT_MAX>>PAGE_SHIFT)+1,
|
|
* so tot_pages cannot overflow without first going negative.
|
|
*/
|
|
if (tot_pages < 0)
|
|
return -EINVAL;
|
|
}
|
|
|
|
return tot_pages * sizeof(struct scatterlist);
|
|
}
|
|
|
|
/*
|
|
* The application asks for a RDMA transfer.
|
|
* Extract all arguments and set up the rdma_op
|
|
*/
|
|
int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
|
|
struct cmsghdr *cmsg,
|
|
struct rds_iov_vector *vec)
|
|
{
|
|
struct rds_rdma_args *args;
|
|
struct rm_rdma_op *op = &rm->rdma;
|
|
int nr_pages;
|
|
unsigned int nr_bytes;
|
|
struct page **pages = NULL;
|
|
struct rds_iovec *iovs;
|
|
unsigned int i, j;
|
|
int ret = 0;
|
|
|
|
if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct rds_rdma_args))
|
|
|| rm->rdma.op_active)
|
|
return -EINVAL;
|
|
|
|
args = CMSG_DATA(cmsg);
|
|
|
|
if (ipv6_addr_any(&rs->rs_bound_addr)) {
|
|
ret = -ENOTCONN; /* XXX not a great errno */
|
|
goto out_ret;
|
|
}
|
|
|
|
if (args->nr_local > UIO_MAXIOV) {
|
|
ret = -EMSGSIZE;
|
|
goto out_ret;
|
|
}
|
|
|
|
if (vec->len != args->nr_local) {
|
|
ret = -EINVAL;
|
|
goto out_ret;
|
|
}
|
|
|
|
iovs = vec->iov;
|
|
|
|
nr_pages = rds_rdma_pages(iovs, args->nr_local);
|
|
if (nr_pages < 0) {
|
|
ret = -EINVAL;
|
|
goto out_ret;
|
|
}
|
|
|
|
pages = kcalloc(nr_pages, sizeof(struct page *), GFP_KERNEL);
|
|
if (!pages) {
|
|
ret = -ENOMEM;
|
|
goto out_ret;
|
|
}
|
|
|
|
op->op_write = !!(args->flags & RDS_RDMA_READWRITE);
|
|
op->op_fence = !!(args->flags & RDS_RDMA_FENCE);
|
|
op->op_notify = !!(args->flags & RDS_RDMA_NOTIFY_ME);
|
|
op->op_silent = !!(args->flags & RDS_RDMA_SILENT);
|
|
op->op_active = 1;
|
|
op->op_recverr = rs->rs_recverr;
|
|
WARN_ON(!nr_pages);
|
|
op->op_sg = rds_message_alloc_sgs(rm, nr_pages, &ret);
|
|
if (!op->op_sg)
|
|
goto out_pages;
|
|
|
|
if (op->op_notify || op->op_recverr) {
|
|
/* We allocate an uninitialized notifier here, because
|
|
* we don't want to do that in the completion handler. We
|
|
* would have to use GFP_ATOMIC there, and don't want to deal
|
|
* with failed allocations.
|
|
*/
|
|
op->op_notifier = kmalloc(sizeof(struct rds_notifier), GFP_KERNEL);
|
|
if (!op->op_notifier) {
|
|
ret = -ENOMEM;
|
|
goto out_pages;
|
|
}
|
|
op->op_notifier->n_user_token = args->user_token;
|
|
op->op_notifier->n_status = RDS_RDMA_SUCCESS;
|
|
|
|
/* Enable rmda notification on data operation for composite
|
|
* rds messages and make sure notification is enabled only
|
|
* for the data operation which follows it so that application
|
|
* gets notified only after full message gets delivered.
|
|
*/
|
|
if (rm->data.op_sg) {
|
|
rm->rdma.op_notify = 0;
|
|
rm->data.op_notify = !!(args->flags & RDS_RDMA_NOTIFY_ME);
|
|
}
|
|
}
|
|
|
|
/* The cookie contains the R_Key of the remote memory region, and
|
|
* optionally an offset into it. This is how we implement RDMA into
|
|
* unaligned memory.
|
|
* When setting up the RDMA, we need to add that offset to the
|
|
* destination address (which is really an offset into the MR)
|
|
* FIXME: We may want to move this into ib_rdma.c
|
|
*/
|
|
op->op_rkey = rds_rdma_cookie_key(args->cookie);
|
|
op->op_remote_addr = args->remote_vec.addr + rds_rdma_cookie_offset(args->cookie);
|
|
|
|
nr_bytes = 0;
|
|
|
|
rdsdebug("RDS: rdma prepare nr_local %llu rva %llx rkey %x\n",
|
|
(unsigned long long)args->nr_local,
|
|
(unsigned long long)args->remote_vec.addr,
|
|
op->op_rkey);
|
|
|
|
for (i = 0; i < args->nr_local; i++) {
|
|
struct rds_iovec *iov = &iovs[i];
|
|
/* don't need to check, rds_rdma_pages() verified nr will be +nonzero */
|
|
unsigned int nr = rds_pages_in_vec(iov);
|
|
|
|
rs->rs_user_addr = iov->addr;
|
|
rs->rs_user_bytes = iov->bytes;
|
|
|
|
/* If it's a WRITE operation, we want to pin the pages for reading.
|
|
* If it's a READ operation, we need to pin the pages for writing.
|
|
*/
|
|
ret = rds_pin_pages(iov->addr, nr, pages, !op->op_write);
|
|
if (ret < 0)
|
|
goto out_pages;
|
|
else
|
|
ret = 0;
|
|
|
|
rdsdebug("RDS: nr_bytes %u nr %u iov->bytes %llu iov->addr %llx\n",
|
|
nr_bytes, nr, iov->bytes, iov->addr);
|
|
|
|
nr_bytes += iov->bytes;
|
|
|
|
for (j = 0; j < nr; j++) {
|
|
unsigned int offset = iov->addr & ~PAGE_MASK;
|
|
struct scatterlist *sg;
|
|
|
|
sg = &op->op_sg[op->op_nents + j];
|
|
sg_set_page(sg, pages[j],
|
|
min_t(unsigned int, iov->bytes, PAGE_SIZE - offset),
|
|
offset);
|
|
|
|
rdsdebug("RDS: sg->offset %x sg->len %x iov->addr %llx iov->bytes %llu\n",
|
|
sg->offset, sg->length, iov->addr, iov->bytes);
|
|
|
|
iov->addr += sg->length;
|
|
iov->bytes -= sg->length;
|
|
}
|
|
|
|
op->op_nents += nr;
|
|
}
|
|
|
|
if (nr_bytes > args->remote_vec.bytes) {
|
|
rdsdebug("RDS nr_bytes %u remote_bytes %u do not match\n",
|
|
nr_bytes,
|
|
(unsigned int) args->remote_vec.bytes);
|
|
ret = -EINVAL;
|
|
goto out_pages;
|
|
}
|
|
op->op_bytes = nr_bytes;
|
|
|
|
out_pages:
|
|
kfree(pages);
|
|
out_ret:
|
|
if (ret)
|
|
rds_rdma_free_op(op);
|
|
else
|
|
rds_stats_inc(s_send_rdma);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* The application wants us to pass an RDMA destination (aka MR)
|
|
* to the remote
|
|
*/
|
|
int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm,
|
|
struct cmsghdr *cmsg)
|
|
{
|
|
unsigned long flags;
|
|
struct rds_mr *mr;
|
|
u32 r_key;
|
|
int err = 0;
|
|
|
|
if (cmsg->cmsg_len < CMSG_LEN(sizeof(rds_rdma_cookie_t)) ||
|
|
rm->m_rdma_cookie != 0)
|
|
return -EINVAL;
|
|
|
|
memcpy(&rm->m_rdma_cookie, CMSG_DATA(cmsg), sizeof(rm->m_rdma_cookie));
|
|
|
|
/* We are reusing a previously mapped MR here. Most likely, the
|
|
* application has written to the buffer, so we need to explicitly
|
|
* flush those writes to RAM. Otherwise the HCA may not see them
|
|
* when doing a DMA from that buffer.
|
|
*/
|
|
r_key = rds_rdma_cookie_key(rm->m_rdma_cookie);
|
|
|
|
spin_lock_irqsave(&rs->rs_rdma_lock, flags);
|
|
mr = rds_mr_tree_walk(&rs->rs_rdma_keys, r_key, NULL);
|
|
if (!mr)
|
|
err = -EINVAL; /* invalid r_key */
|
|
else
|
|
refcount_inc(&mr->r_refcount);
|
|
spin_unlock_irqrestore(&rs->rs_rdma_lock, flags);
|
|
|
|
if (mr) {
|
|
mr->r_trans->sync_mr(mr->r_trans_private, DMA_TO_DEVICE);
|
|
rm->rdma.op_rdma_mr = mr;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* The application passes us an address range it wants to enable RDMA
|
|
* to/from. We map the area, and save the <R_Key,offset> pair
|
|
* in rm->m_rdma_cookie. This causes it to be sent along to the peer
|
|
* in an extension header.
|
|
*/
|
|
int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
|
|
struct cmsghdr *cmsg)
|
|
{
|
|
if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct rds_get_mr_args)) ||
|
|
rm->m_rdma_cookie != 0)
|
|
return -EINVAL;
|
|
|
|
return __rds_rdma_map(rs, CMSG_DATA(cmsg), &rm->m_rdma_cookie,
|
|
&rm->rdma.op_rdma_mr, rm->m_conn_path);
|
|
}
|
|
|
|
/*
|
|
* Fill in rds_message for an atomic request.
|
|
*/
|
|
int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
|
|
struct cmsghdr *cmsg)
|
|
{
|
|
struct page *page = NULL;
|
|
struct rds_atomic_args *args;
|
|
int ret = 0;
|
|
|
|
if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct rds_atomic_args))
|
|
|| rm->atomic.op_active)
|
|
return -EINVAL;
|
|
|
|
args = CMSG_DATA(cmsg);
|
|
|
|
/* Nonmasked & masked cmsg ops converted to masked hw ops */
|
|
switch (cmsg->cmsg_type) {
|
|
case RDS_CMSG_ATOMIC_FADD:
|
|
rm->atomic.op_type = RDS_ATOMIC_TYPE_FADD;
|
|
rm->atomic.op_m_fadd.add = args->fadd.add;
|
|
rm->atomic.op_m_fadd.nocarry_mask = 0;
|
|
break;
|
|
case RDS_CMSG_MASKED_ATOMIC_FADD:
|
|
rm->atomic.op_type = RDS_ATOMIC_TYPE_FADD;
|
|
rm->atomic.op_m_fadd.add = args->m_fadd.add;
|
|
rm->atomic.op_m_fadd.nocarry_mask = args->m_fadd.nocarry_mask;
|
|
break;
|
|
case RDS_CMSG_ATOMIC_CSWP:
|
|
rm->atomic.op_type = RDS_ATOMIC_TYPE_CSWP;
|
|
rm->atomic.op_m_cswp.compare = args->cswp.compare;
|
|
rm->atomic.op_m_cswp.swap = args->cswp.swap;
|
|
rm->atomic.op_m_cswp.compare_mask = ~0;
|
|
rm->atomic.op_m_cswp.swap_mask = ~0;
|
|
break;
|
|
case RDS_CMSG_MASKED_ATOMIC_CSWP:
|
|
rm->atomic.op_type = RDS_ATOMIC_TYPE_CSWP;
|
|
rm->atomic.op_m_cswp.compare = args->m_cswp.compare;
|
|
rm->atomic.op_m_cswp.swap = args->m_cswp.swap;
|
|
rm->atomic.op_m_cswp.compare_mask = args->m_cswp.compare_mask;
|
|
rm->atomic.op_m_cswp.swap_mask = args->m_cswp.swap_mask;
|
|
break;
|
|
default:
|
|
BUG(); /* should never happen */
|
|
}
|
|
|
|
rm->atomic.op_notify = !!(args->flags & RDS_RDMA_NOTIFY_ME);
|
|
rm->atomic.op_silent = !!(args->flags & RDS_RDMA_SILENT);
|
|
rm->atomic.op_active = 1;
|
|
rm->atomic.op_recverr = rs->rs_recverr;
|
|
rm->atomic.op_sg = rds_message_alloc_sgs(rm, 1, &ret);
|
|
if (!rm->atomic.op_sg)
|
|
goto err;
|
|
|
|
/* verify 8 byte-aligned */
|
|
if (args->local_addr & 0x7) {
|
|
ret = -EFAULT;
|
|
goto err;
|
|
}
|
|
|
|
ret = rds_pin_pages(args->local_addr, 1, &page, 1);
|
|
if (ret != 1)
|
|
goto err;
|
|
ret = 0;
|
|
|
|
sg_set_page(rm->atomic.op_sg, page, 8, offset_in_page(args->local_addr));
|
|
|
|
if (rm->atomic.op_notify || rm->atomic.op_recverr) {
|
|
/* We allocate an uninitialized notifier here, because
|
|
* we don't want to do that in the completion handler. We
|
|
* would have to use GFP_ATOMIC there, and don't want to deal
|
|
* with failed allocations.
|
|
*/
|
|
rm->atomic.op_notifier = kmalloc(sizeof(*rm->atomic.op_notifier), GFP_KERNEL);
|
|
if (!rm->atomic.op_notifier) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
rm->atomic.op_notifier->n_user_token = args->user_token;
|
|
rm->atomic.op_notifier->n_status = RDS_RDMA_SUCCESS;
|
|
}
|
|
|
|
rm->atomic.op_rkey = rds_rdma_cookie_key(args->cookie);
|
|
rm->atomic.op_remote_addr = args->remote_addr + rds_rdma_cookie_offset(args->cookie);
|
|
|
|
return ret;
|
|
err:
|
|
if (page)
|
|
put_page(page);
|
|
rm->atomic.op_active = 0;
|
|
kfree(rm->atomic.op_notifier);
|
|
|
|
return ret;
|
|
}
|