diff options
author | Andy Grover <andy.grover@oracle.com> | 2010-01-12 14:13:15 -0800 |
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committer | Andy Grover <andy.grover@oracle.com> | 2010-09-08 18:11:38 -0700 |
commit | ff87e97a9d70c9ae133d3d3d7792b26ab85f4297 (patch) | |
tree | 32de73cdf5e4353e89b3351eaae695f69faa868b /net/rds/rdma.c | |
parent | 21f79afa5fda2820671a8f64c3d0e43bb118053b (diff) | |
download | linux-ff87e97a9d70c9ae133d3d3d7792b26ab85f4297.tar.bz2 |
RDS: make m_rdma_op a member of rds_message
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>
Diffstat (limited to 'net/rds/rdma.c')
-rw-r--r-- | net/rds/rdma.c | 113 |
1 files changed, 60 insertions, 53 deletions
diff --git a/net/rds/rdma.c b/net/rds/rdma.c index a21edad33950..7ff3379bab14 100644 --- a/net/rds/rdma.c +++ b/net/rds/rdma.c @@ -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; - - 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) { - 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) { + pages = kcalloc(nr_pages, sizeof(struct page *), GFP_KERNEL); + if (!pages) { 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; } |