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RDS: make m_rdma_op a member of rds_message

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This eliminates a separate memory alloc, although
it is now necessary to add an "r_active" flag, since
it is no longer to use the m_rdma_op pointer as an
indicator of if an rdma op is present.

rdma SGs allocated from rm sg pool.

rds_rm_size also gets bigger. It's a little inefficient to
run through CMSGs twice, but it makes later steps a lot smoother.

Signed-off-by: Andy Grover <andy.grover@oracle.com>
This commit is contained in:
Andy Grover
2010-01-12 14:13:15 -08:00
parent 21f79afa5f
commit ff87e97a9d
6 changed files with 129 additions and 90 deletions
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113
net/rds/rdma.c
View File

@@ -458,26 +458,60 @@ void rds_rdma_free_op(struct rds_rdma_op *ro)
}
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) {
@@ -490,44 +524,21 @@ static struct rds_rdma_op *rds_rdma_prepare(struct rds_sock *rs,
goto out;
}
nr_pages = 0;
max_pages = 0;
nr_pages = rds_rdma_pages(args);
if (nr_pages < 0)
goto out;
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);
pages = kcalloc(nr_pages, sizeof(struct page *), GFP_KERNEL);
if (!pages) {
ret = -ENOMEM;
goto out;
}
op = kzalloc(offsetof(struct rds_rdma_op, r_sg[nr_pages]), GFP_KERNEL);
if (!op) {
ret = -ENOMEM;
goto out;
}
op->r_sg = rds_message_alloc_sgs(rm, nr_pages);
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);
@@ -564,6 +575,8 @@ static struct rds_rdma_op *rds_rdma_prepare(struct rds_sock *rs,
(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))) {
@@ -580,11 +593,6 @@ static struct rds_rdma_op *rds_rdma_prepare(struct rds_sock *rs,
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.
*/
@@ -599,6 +607,7 @@ static struct rds_rdma_op *rds_rdma_prepare(struct rds_sock *rs,
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],
@@ -628,12 +637,10 @@ static struct rds_rdma_op *rds_rdma_prepare(struct rds_sock *rs,
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;
}
/*
@@ -643,17 +650,17 @@ out:
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->rdma.m_rdma_op)
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->rdma.m_rdma_op = op;
return 0;
}