diff options
| -rw-r--r-- | net/rds/message.c | 51 | ||||
| -rw-r--r-- | net/rds/rds.h | 7 | ||||
| -rw-r--r-- | net/rds/send.c | 31 |
3 files changed, 62 insertions, 27 deletions
diff --git a/net/rds/message.c b/net/rds/message.c index 4421d160b1a4..3498cbcc7542 100644 --- a/net/rds/message.c +++ b/net/rds/message.c @@ -214,17 +214,22 @@ int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 o } 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->data.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); @@ -234,6 +239,23 @@ 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); + + sg_ret = &sg_first[rm->m_used_sgs]; + + 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; @@ -256,22 +278,15 @@ struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned in 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); @@ -320,14 +335,8 @@ struct rds_message *rds_message_copy_from_user(struct iovec *first_iov, 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, diff --git a/net/rds/rds.h b/net/rds/rds.h index 07a750b3fb31..d29c71aabbd4 100644 --- a/net/rds/rds.h +++ b/net/rds/rds.h @@ -268,9 +268,11 @@ struct rds_message { struct { unsigned int m_nents; unsigned int m_count; - struct scatterlist m_sg[0]; + struct scatterlist *m_sg; } data; }; + unsigned int m_used_sgs; + unsigned int m_total_sgs; }; /* @@ -573,7 +575,8 @@ rds_conn_connecting(struct rds_connection *conn) /* message.c */ struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp); -struct rds_message *rds_message_copy_from_user(struct iovec *first_iov, +struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents); +int rds_message_copy_from_user(struct rds_message *rm, struct iovec *first_iov, size_t total_len); struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len); void rds_message_populate_header(struct rds_header *hdr, __be16 sport, diff --git a/net/rds/send.c b/net/rds/send.c index 19dfd025498e..28d09447207b 100644 --- a/net/rds/send.c +++ b/net/rds/send.c @@ -758,6 +758,19 @@ out: return *queued; } +/* + * rds_message is getting to be quite complicated, and we'd like to allocate + * it all in one go. This figures out how big it needs to be up front. + */ +static int rds_rm_size(struct msghdr *msg, int data_len) +{ + int size = 0; + + size += ceil(data_len, PAGE_SIZE) * sizeof(struct scatterlist); + + return size; +} + static int rds_cmsg_send(struct rds_sock *rs, struct rds_message *rm, struct msghdr *msg, int *allocated_mr) { @@ -845,13 +858,23 @@ int rds_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, goto out; } - rm = rds_message_copy_from_user(msg->msg_iov, payload_len); - if (IS_ERR(rm)) { - ret = PTR_ERR(rm); - rm = NULL; + /* size of rm including all sgs */ + ret = rds_rm_size(msg, payload_len); + if (ret < 0) + goto out; + + rm = rds_message_alloc(ret, GFP_KERNEL); + if (!rm) { + ret = -ENOMEM; goto out; } + rm->data.m_sg = rds_message_alloc_sgs(rm, ceil(payload_len, PAGE_SIZE)); + /* XXX fix this to not allocate memory */ + ret = rds_message_copy_from_user(rm, msg->msg_iov, payload_len); + if (ret) + goto out; + rm->m_daddr = daddr; /* rds_conn_create has a spinlock that runs with IRQ off. |