#include <linux/rbtree.h>
#include <linux/dma-mapping.h> /* for DMA_*_DEVICE */
-#include "rdma.h"
+#include "rds.h"
/*
* XXX
{
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 = container_of(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();
goto out;
}
- if (rs->rs_transport->get_mr == NULL) {
+ if (!rs->rs_transport->get_mr) {
ret = -EOPNOTSUPP;
goto out;
}
/* XXX clamp nr_pages to limit the size of this alloc? */
pages = kcalloc(nr_pages, sizeof(struct page *), GFP_KERNEL);
- if (pages == NULL) {
+ if (!pages) {
ret = -ENOMEM;
goto out;
}
mr = kzalloc(sizeof(struct rds_mr), GFP_KERNEL);
- if (mr == NULL) {
+ if (!mr) {
ret = -ENOMEM;
goto out;
}
* 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 & PAGE_MASK, nr_pages, pages, 1);
+ 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 == NULL) {
+ if (!sg) {
ret = -ENOMEM;
goto out;
}
spin_lock_irqsave(&rs->rs_rdma_lock, flags);
mr = rds_mr_tree_walk(&rs->rs_rdma_keys, r_key, NULL);
- if (mr && (mr->r_use_once || force)) {
+ if (!mr) {
+ printk(KERN_ERR "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;
- } else if (mr)
- atomic_inc(&mr->r_refcount);
+ }
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 != NULL) {
- 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);
- }
+ 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 rds_rdma_op *ro)
* is the case for a RDMA_READ which copies from remote
* to local memory */
if (!ro->r_write) {
- BUG_ON(in_interrupt());
+ BUG_ON(irqs_disabled());
set_page_dirty(page);
}
put_page(page);
}
kfree(ro->r_notifier);
- kfree(ro);
+ ro->r_notifier = NULL;
+ ro->r_active = 0;
+}
+
+/*
+ * Count the number of pages needed to describe an incoming iovec.
+ */
+static int rds_rdma_pages(struct rds_rdma_args *args)
+{
+ struct rds_iovec vec;
+ struct rds_iovec __user *local_vec;
+ unsigned int tot_pages = 0;
+ unsigned int nr_pages;
+ unsigned int i;
+
+ local_vec = (struct rds_iovec __user *)(unsigned long) args->local_vec_addr;
+
+ /* figure out the number of pages in the vector */
+ for (i = 0; i < args->nr_local; i++) {
+ if (copy_from_user(&vec, &local_vec[i],
+ sizeof(struct rds_iovec)))
+ return -EFAULT;
+
+ nr_pages = rds_pages_in_vec(&vec);
+ if (nr_pages == 0)
+ return -EINVAL;
+
+ tot_pages += nr_pages;
+ }
+
+ return tot_pages;
+}
+
+int rds_rdma_extra_size(struct rds_rdma_args *args)
+{
+ return rds_rdma_pages(args) * sizeof(struct scatterlist);
}
/*
* args is a pointer to an in-kernel copy in the sendmsg cmsg.
*/
-static struct rds_rdma_op *rds_rdma_prepare(struct rds_sock *rs,
- struct rds_rdma_args *args)
+static int rds_rdma_prepare(struct rds_message *rm,
+ struct rds_sock *rs,
+ struct rds_rdma_args *args)
{
struct rds_iovec vec;
- struct rds_rdma_op *op = NULL;
+ struct rds_rdma_op *op = &rm->rdma.m_rdma_op;
unsigned int nr_pages;
- unsigned int max_pages;
unsigned int nr_bytes;
struct page **pages = NULL;
struct rds_iovec __user *local_vec;
- struct scatterlist *sg;
unsigned int nr;
unsigned int i, j;
- int ret;
+ int ret = 0;
if (rs->rs_bound_addr == 0) {
goto out;
}
- nr_pages = 0;
- max_pages = 0;
-
- local_vec = (struct rds_iovec __user *)(unsigned long) args->local_vec_addr;
-
- /* figure out the number of pages in the vector */
- for (i = 0; i < args->nr_local; i++) {
- if (copy_from_user(&vec, &local_vec[i],
- sizeof(struct rds_iovec))) {
- ret = -EFAULT;
- goto out;
- }
-
- nr = rds_pages_in_vec(&vec);
- if (nr == 0) {
- ret = -EINVAL;
- goto out;
- }
-
- max_pages = max(nr, max_pages);
- nr_pages += nr;
- }
-
- pages = kcalloc(max_pages, sizeof(struct page *), GFP_KERNEL);
- if (pages == NULL) {
- ret = -ENOMEM;
+ nr_pages = rds_rdma_pages(args);
+ if (nr_pages < 0)
goto out;
- }
- op = kzalloc(offsetof(struct rds_rdma_op, r_sg[nr_pages]), GFP_KERNEL);
- if (op == NULL) {
+ pages = kcalloc(nr_pages, sizeof(struct page *), GFP_KERNEL);
+ if (!pages) {
ret = -ENOMEM;
goto out;
}
op->r_write = !!(args->flags & RDS_RDMA_READWRITE);
op->r_fence = !!(args->flags & RDS_RDMA_FENCE);
op->r_notify = !!(args->flags & RDS_RDMA_NOTIFY_ME);
+ op->r_active = 1;
op->r_recverr = rs->rs_recverr;
WARN_ON(!nr_pages);
- sg_init_table(op->r_sg, nr_pages);
+ op->r_sg = rds_message_alloc_sgs(rm, nr_pages);
if (op->r_notify || op->r_recverr) {
/* We allocate an uninitialized notifier here, because
(unsigned long long)args->remote_vec.addr,
op->r_key);
+ local_vec = (struct rds_iovec __user *)(unsigned long) args->local_vec_addr;
+
for (i = 0; i < args->nr_local; i++) {
if (copy_from_user(&vec, &local_vec[i],
sizeof(struct rds_iovec))) {
rs->rs_user_addr = vec.addr;
rs->rs_user_bytes = vec.bytes;
- /* did the user change the vec under us? */
- if (nr > max_pages || op->r_nents + nr > nr_pages) {
- ret = -EINVAL;
- goto out;
- }
/* 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(vec.addr & PAGE_MASK, nr, pages, !op->r_write);
+ ret = rds_pin_pages(vec.addr, nr, pages, !op->r_write);
if (ret < 0)
goto out;
for (j = 0; j < nr; j++) {
unsigned int offset = vec.addr & ~PAGE_MASK;
+ struct scatterlist *sg;
sg = &op->r_sg[op->r_nents + j];
sg_set_page(sg, pages[j],
ret = 0;
out:
kfree(pages);
- if (ret) {
- if (op)
- rds_rdma_free_op(op);
- op = ERR_PTR(ret);
- }
- return op;
+ if (ret)
+ rds_rdma_free_op(op);
+
+ return ret;
}
/*
int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
struct cmsghdr *cmsg)
{
- struct rds_rdma_op *op;
+ int ret;
if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct rds_rdma_args)) ||
- rm->m_rdma_op != NULL)
+ rm->rdma.m_rdma_op.r_active)
return -EINVAL;
- op = rds_rdma_prepare(rs, CMSG_DATA(cmsg));
- if (IS_ERR(op))
- return PTR_ERR(op);
+ ret = rds_rdma_prepare(rm, rs, CMSG_DATA(cmsg));
+ if (ret)
+ return ret;
+
rds_stats_inc(s_send_rdma);
- rm->m_rdma_op = op;
return 0;
}
*/
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 == NULL)
+ if (!mr)
err = -EINVAL; /* invalid r_key */
else
atomic_inc(&mr->r_refcount);
if (mr) {
mr->r_trans->sync_mr(mr->r_trans_private, DMA_TO_DEVICE);
- rm->m_rdma_mr = mr;
+ rm->rdma.m_rdma_mr = mr;
}
return err;
}
rm->m_rdma_cookie != 0)
return -EINVAL;
- return __rds_rdma_map(rs, CMSG_DATA(cmsg), &rm->m_rdma_cookie, &rm->m_rdma_mr);
+ return __rds_rdma_map(rs, CMSG_DATA(cmsg), &rm->m_rdma_cookie, &rm->rdma.m_rdma_mr);
+}
+
+/*
+ * 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);
+
+ if (cmsg->cmsg_type == RDS_CMSG_ATOMIC_CSWP) {
+ rm->atomic.op_type = RDS_ATOMIC_TYPE_CSWP;
+ rm->atomic.op_swap_add = args->cswp.swap;
+ rm->atomic.op_compare = args->cswp.compare;
+ } else {
+ rm->atomic.op_type = RDS_ATOMIC_TYPE_FADD;
+ rm->atomic.op_swap_add = args->fadd.add;
+ }
+
+ rm->atomic.op_notify = !!(args->flags & RDS_RDMA_NOTIFY_ME);
+ rm->atomic.op_recverr = rs->rs_recverr;
+ rm->atomic.op_sg = rds_message_alloc_sgs(rm, 1);
+
+ /* 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);
+
+ rm->atomic.op_active = 1;
+
+ return ret;
+err:
+ if (page)
+ put_page(page);
+ kfree(rm->atomic.op_notifier);
+
+ return ret;
}
git.openpandora.org / pandora-kernel.git / blobdiff