#include <linux/slab.h>
#include "rds.h"
-#include "rdma.h"
-
-static DECLARE_WAIT_QUEUE_HEAD(rds_message_flush_waitq);
static unsigned int rds_exthdr_size[__RDS_EXTHDR_MAX] = {
[RDS_EXTHDR_NONE] = 0,
if (unlikely(test_bit(RDS_MSG_PAGEVEC, &rm->m_flags)))
return;
- for (i = 0; i < rm->m_nents; i++) {
- rdsdebug("putting data page %p\n", (void *)sg_page(&rm->m_sg[i]));
+ for (i = 0; i < rm->data.op_nents; i++) {
+ rdsdebug("putting data page %p\n", (void *)sg_page(&rm->data.op_sg[i]));
/* XXX will have to put_page for page refs */
- __free_page(sg_page(&rm->m_sg[i]));
+ __free_page(sg_page(&rm->data.op_sg[i]));
}
- rm->m_nents = 0;
+ rm->data.op_nents = 0;
- if (rm->m_rdma_op)
- rds_rdma_free_op(rm->m_rdma_op);
- if (rm->m_rdma_mr)
- rds_mr_put(rm->m_rdma_mr);
-}
+ if (rm->rdma.op_active)
+ rds_rdma_free_op(&rm->rdma);
+ if (rm->rdma.op_rdma_mr)
+ rds_mr_put(rm->rdma.op_rdma_mr);
-void rds_message_inc_purge(struct rds_incoming *inc)
-{
- struct rds_message *rm = container_of(inc, struct rds_message, m_inc);
- rds_message_purge(rm);
+ if (rm->atomic.op_active)
+ rds_atomic_free_op(&rm->atomic);
+ if (rm->atomic.op_rdma_mr)
+ rds_mr_put(rm->atomic.op_rdma_mr);
}
void rds_message_put(struct rds_message *rm)
{
rdsdebug("put rm %p ref %d\n", rm, atomic_read(&rm->m_refcount));
-
+ if (atomic_read(&rm->m_refcount) == 0) {
+printk(KERN_CRIT "danger refcount zero on %p\n", rm);
+WARN_ON(1);
+ }
if (atomic_dec_and_test(&rm->m_refcount)) {
BUG_ON(!list_empty(&rm->m_sock_item));
BUG_ON(!list_empty(&rm->m_conn_item));
}
EXPORT_SYMBOL_GPL(rds_message_put);
-void rds_message_inc_free(struct rds_incoming *inc)
-{
- struct rds_message *rm = container_of(inc, struct rds_message, m_inc);
- rds_message_put(rm);
-}
-
void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
__be16 dport, u64 seq)
{
}
EXPORT_SYMBOL_GPL(rds_message_add_rdma_dest_extension);
-struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp)
+/*
+ * Each rds_message is allocated with extra space for the scatterlist entries
+ * rds ops will need. This is to minimize memory allocation count. Then, each rds op
+ * can grab SGs when initializing its part of the rds_message.
+ */
+struct rds_message *rds_message_alloc(unsigned int extra_len, gfp_t gfp)
{
struct rds_message *rm;
- rm = kzalloc(sizeof(struct rds_message) +
- (nents * sizeof(struct scatterlist)), gfp);
+ rm = kzalloc(sizeof(struct rds_message) + extra_len, gfp);
if (!rm)
goto out;
- if (nents)
- sg_init_table(rm->m_sg, nents);
+ rm->m_used_sgs = 0;
+ rm->m_total_sgs = extra_len / sizeof(struct scatterlist);
+
atomic_set(&rm->m_refcount, 1);
INIT_LIST_HEAD(&rm->m_sock_item);
INIT_LIST_HEAD(&rm->m_conn_item);
spin_lock_init(&rm->m_rs_lock);
+ init_waitqueue_head(&rm->m_flush_wait);
out:
return rm;
}
+/*
+ * RDS ops use this to grab SG entries from the rm's sg pool.
+ */
+struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents)
+{
+ struct scatterlist *sg_first = (struct scatterlist *) &rm[1];
+ struct scatterlist *sg_ret;
+
+ WARN_ON(rm->m_used_sgs + nents > rm->m_total_sgs);
+ WARN_ON(!nents);
+
+ sg_ret = &sg_first[rm->m_used_sgs];
+ sg_init_table(sg_ret, nents);
+ rm->m_used_sgs += nents;
+
+ return sg_ret;
+}
+
struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len)
{
struct rds_message *rm;
unsigned int i;
+ int num_sgs = ceil(total_len, PAGE_SIZE);
+ int extra_bytes = num_sgs * sizeof(struct scatterlist);
- rm = rds_message_alloc(ceil(total_len, PAGE_SIZE), GFP_KERNEL);
- if (rm == NULL)
+ rm = rds_message_alloc(extra_bytes, GFP_NOWAIT);
+ if (!rm)
return ERR_PTR(-ENOMEM);
set_bit(RDS_MSG_PAGEVEC, &rm->m_flags);
rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len);
- rm->m_nents = ceil(total_len, PAGE_SIZE);
+ rm->data.op_nents = ceil(total_len, PAGE_SIZE);
+ rm->data.op_sg = rds_message_alloc_sgs(rm, num_sgs);
- for (i = 0; i < rm->m_nents; ++i) {
- sg_set_page(&rm->m_sg[i],
+ for (i = 0; i < rm->data.op_nents; ++i) {
+ sg_set_page(&rm->data.op_sg[i],
virt_to_page(page_addrs[i]),
PAGE_SIZE, 0);
}
return rm;
}
-struct rds_message *rds_message_copy_from_user(struct iovec *first_iov,
+int rds_message_copy_from_user(struct rds_message *rm, struct iovec *first_iov,
size_t total_len)
{
unsigned long to_copy;
unsigned long iov_off;
unsigned long sg_off;
- struct rds_message *rm;
struct iovec *iov;
struct scatterlist *sg;
- int ret;
-
- rm = rds_message_alloc(ceil(total_len, PAGE_SIZE), GFP_KERNEL);
- if (rm == NULL) {
- ret = -ENOMEM;
- goto out;
- }
+ int ret = 0;
rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len);
/*
* now allocate and copy in the data payload.
*/
- sg = rm->m_sg;
+ sg = rm->data.op_sg;
iov = first_iov;
iov_off = 0;
sg_off = 0; /* Dear gcc, sg->page will be null from kzalloc. */
while (total_len) {
- if (sg_page(sg) == NULL) {
+ if (!sg_page(sg)) {
ret = rds_page_remainder_alloc(sg, total_len,
GFP_HIGHUSER);
if (ret)
goto out;
- rm->m_nents++;
+ rm->data.op_nents++;
sg_off = 0;
}
sg++;
}
- ret = 0;
out:
- if (ret) {
- if (rm)
- rds_message_put(rm);
- rm = ERR_PTR(ret);
- }
- return rm;
+ return ret;
}
int rds_message_inc_copy_to_user(struct rds_incoming *inc,
iov = first_iov;
iov_off = 0;
- sg = rm->m_sg;
+ sg = rm->data.op_sg;
vec_off = 0;
copied = 0;
*/
void rds_message_wait(struct rds_message *rm)
{
- wait_event(rds_message_flush_waitq,
+ wait_event_interruptible(rm->m_flush_wait,
!test_bit(RDS_MSG_MAPPED, &rm->m_flags));
}
void rds_message_unmapped(struct rds_message *rm)
{
clear_bit(RDS_MSG_MAPPED, &rm->m_flags);
- if (waitqueue_active(&rds_message_flush_waitq))
- wake_up(&rds_message_flush_waitq);
+ wake_up_interruptible(&rm->m_flush_wait);
}
EXPORT_SYMBOL_GPL(rds_message_unmapped);
projects / karo-tx-linux.git / blobdiff