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Diffstat (limited to 'net')
-rw-r--r--net/rds/message.c51
-rw-r--r--net/rds/rds.h3
-rw-r--r--net/rds/send.c44
3 files changed, 90 insertions, 8 deletions
diff --git a/net/rds/message.c b/net/rds/message.c
index bf1a656b198a..651834513481 100644
--- a/net/rds/message.c
+++ b/net/rds/message.c
@@ -341,12 +341,14 @@ struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned in
return rm;
}
-int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from)
+int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from,
+ bool zcopy)
{
unsigned long to_copy, nbytes;
unsigned long sg_off;
struct scatterlist *sg;
int ret = 0;
+ int length = iov_iter_count(from);
rm->m_inc.i_hdr.h_len = cpu_to_be32(iov_iter_count(from));
@@ -356,6 +358,53 @@ int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from)
sg = rm->data.op_sg;
sg_off = 0; /* Dear gcc, sg->page will be null from kzalloc. */
+ if (zcopy) {
+ int total_copied = 0;
+ struct sk_buff *skb;
+
+ skb = alloc_skb(SO_EE_ORIGIN_MAX_ZCOOKIES * sizeof(u32),
+ GFP_KERNEL);
+ if (!skb)
+ return -ENOMEM;
+ rm->data.op_mmp_znotifier = RDS_ZCOPY_SKB(skb);
+ if (mm_account_pinned_pages(&rm->data.op_mmp_znotifier->z_mmp,
+ length)) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ while (iov_iter_count(from)) {
+ struct page *pages;
+ size_t start;
+ ssize_t copied;
+
+ copied = iov_iter_get_pages(from, &pages, PAGE_SIZE,
+ 1, &start);
+ if (copied < 0) {
+ struct mmpin *mmp;
+ int i;
+
+ for (i = 0; i < rm->data.op_nents; i++)
+ put_page(sg_page(&rm->data.op_sg[i]));
+ mmp = &rm->data.op_mmp_znotifier->z_mmp;
+ mm_unaccount_pinned_pages(mmp);
+ ret = -EFAULT;
+ goto err;
+ }
+ total_copied += copied;
+ iov_iter_advance(from, copied);
+ length -= copied;
+ sg_set_page(sg, pages, copied, start);
+ rm->data.op_nents++;
+ sg++;
+ }
+ WARN_ON_ONCE(length != 0);
+ return ret;
+err:
+ consume_skb(skb);
+ rm->data.op_mmp_znotifier = NULL;
+ return ret;
+ } /* zcopy */
+
while (iov_iter_count(from)) {
if (!sg_page(sg)) {
ret = rds_page_remainder_alloc(sg, iov_iter_count(from),
diff --git a/net/rds/rds.h b/net/rds/rds.h
index 24576bc4a5e9..31cd38852050 100644
--- a/net/rds/rds.h
+++ b/net/rds/rds.h
@@ -785,7 +785,8 @@ rds_conn_connecting(struct rds_connection *conn)
/* message.c */
struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp);
struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents);
-int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from);
+int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from,
+ bool zcopy);
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,
__be16 dport, u64 seq);
diff --git a/net/rds/send.c b/net/rds/send.c
index e8f3ff471b15..028ab598ac1b 100644
--- a/net/rds/send.c
+++ b/net/rds/send.c
@@ -875,12 +875,13 @@ out:
* 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)
+static int rds_rm_size(struct msghdr *msg, int num_sgs)
{
struct cmsghdr *cmsg;
int size = 0;
int cmsg_groups = 0;
int retval;
+ bool zcopy_cookie = false;
for_each_cmsghdr(cmsg, msg) {
if (!CMSG_OK(msg, cmsg))
@@ -899,6 +900,8 @@ static int rds_rm_size(struct msghdr *msg, int data_len)
break;
+ case RDS_CMSG_ZCOPY_COOKIE:
+ zcopy_cookie = true;
case RDS_CMSG_RDMA_DEST:
case RDS_CMSG_RDMA_MAP:
cmsg_groups |= 2;
@@ -919,7 +922,10 @@ static int rds_rm_size(struct msghdr *msg, int data_len)
}
- size += ceil(data_len, PAGE_SIZE) * sizeof(struct scatterlist);
+ if ((msg->msg_flags & MSG_ZEROCOPY) && !zcopy_cookie)
+ return -EINVAL;
+
+ size += num_sgs * sizeof(struct scatterlist);
/* Ensure (DEST, MAP) are never used with (ARGS, ATOMIC) */
if (cmsg_groups == 3)
@@ -928,6 +934,18 @@ static int rds_rm_size(struct msghdr *msg, int data_len)
return size;
}
+static int rds_cmsg_zcopy(struct rds_sock *rs, struct rds_message *rm,
+ struct cmsghdr *cmsg)
+{
+ u32 *cookie;
+
+ if (cmsg->cmsg_len < CMSG_LEN(sizeof(*cookie)))
+ return -EINVAL;
+ cookie = CMSG_DATA(cmsg);
+ rm->data.op_mmp_znotifier->z_cookie = *cookie;
+ return 0;
+}
+
static int rds_cmsg_send(struct rds_sock *rs, struct rds_message *rm,
struct msghdr *msg, int *allocated_mr)
{
@@ -970,6 +988,10 @@ static int rds_cmsg_send(struct rds_sock *rs, struct rds_message *rm,
ret = rds_cmsg_atomic(rs, rm, cmsg);
break;
+ case RDS_CMSG_ZCOPY_COOKIE:
+ ret = rds_cmsg_zcopy(rs, rm, cmsg);
+ break;
+
default:
return -EINVAL;
}
@@ -1040,10 +1062,13 @@ int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len)
long timeo = sock_sndtimeo(sk, nonblock);
struct rds_conn_path *cpath;
size_t total_payload_len = payload_len, rdma_payload_len = 0;
+ bool zcopy = ((msg->msg_flags & MSG_ZEROCOPY) &&
+ sock_flag(rds_rs_to_sk(rs), SOCK_ZEROCOPY));
+ int num_sgs = ceil(payload_len, PAGE_SIZE);
/* Mirror Linux UDP mirror of BSD error message compatibility */
/* XXX: Perhaps MSG_MORE someday */
- if (msg->msg_flags & ~(MSG_DONTWAIT | MSG_CMSG_COMPAT)) {
+ if (msg->msg_flags & ~(MSG_DONTWAIT | MSG_CMSG_COMPAT | MSG_ZEROCOPY)) {
ret = -EOPNOTSUPP;
goto out;
}
@@ -1087,8 +1112,15 @@ int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len)
goto out;
}
+ if (zcopy) {
+ if (rs->rs_transport->t_type != RDS_TRANS_TCP) {
+ ret = -EOPNOTSUPP;
+ goto out;
+ }
+ num_sgs = iov_iter_npages(&msg->msg_iter, INT_MAX);
+ }
/* size of rm including all sgs */
- ret = rds_rm_size(msg, payload_len);
+ ret = rds_rm_size(msg, num_sgs);
if (ret < 0)
goto out;
@@ -1100,12 +1132,12 @@ int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len)
/* Attach data to the rm */
if (payload_len) {
- rm->data.op_sg = rds_message_alloc_sgs(rm, ceil(payload_len, PAGE_SIZE));
+ rm->data.op_sg = rds_message_alloc_sgs(rm, num_sgs);
if (!rm->data.op_sg) {
ret = -ENOMEM;
goto out;
}
- ret = rds_message_copy_from_user(rm, &msg->msg_iter);
+ ret = rds_message_copy_from_user(rm, &msg->msg_iter, zcopy);
if (ret)
goto out;
}
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2024-12-29 13:51:27 +0000