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Message-ID: <20230623114425.2150536-12-dhowells@redhat.com>
Date: Fri, 23 Jun 2023 12:44:21 +0100
From: David Howells <dhowells@...hat.com>
To: netdev@...r.kernel.org
Cc: David Howells <dhowells@...hat.com>,
Alexander Duyck <alexander.duyck@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Willem de Bruijn <willemdebruijn.kernel@...il.com>,
David Ahern <dsahern@...nel.org>,
Matthew Wilcox <willy@...radead.org>,
Jens Axboe <axboe@...nel.dk>,
linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
Lee Duncan <lduncan@...e.com>,
Chris Leech <cleech@...hat.com>,
Mike Christie <michael.christie@...cle.com>,
Maurizio Lombardi <mlombard@...hat.com>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Al Viro <viro@...iv.linux.org.uk>,
open-iscsi@...glegroups.com,
linux-scsi@...r.kernel.org,
target-devel@...r.kernel.org
Subject: [PATCH net-next v4 11/15] iscsi: Use sendmsg(MSG_SPLICE_PAGES) rather than sendpage
Use sendmsg() with MSG_SPLICE_PAGES rather than sendpage. This allows
multiple pages and multipage folios to be passed through.
TODO: iscsit_fe_sendpage_sg() should perhaps set up a bio_vec array for the
entire set of pages it's going to transfer plus two for the header and
trailer and page fragments to hold the header and trailer - and then call
sendmsg once for the entire message.
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Lee Duncan <lduncan@...e.com>
cc: Chris Leech <cleech@...hat.com>
cc: Mike Christie <michael.christie@...cle.com>
cc: Maurizio Lombardi <mlombard@...hat.com>
cc: "James E.J. Bottomley" <jejb@...ux.ibm.com>
cc: "Martin K. Petersen" <martin.petersen@...cle.com>
cc: "David S. Miller" <davem@...emloft.net>
cc: Eric Dumazet <edumazet@...gle.com>
cc: Jakub Kicinski <kuba@...nel.org>
cc: Paolo Abeni <pabeni@...hat.com>
cc: Jens Axboe <axboe@...nel.dk>
cc: Matthew Wilcox <willy@...radead.org>
cc: Al Viro <viro@...iv.linux.org.uk>
cc: open-iscsi@...glegroups.com
cc: linux-scsi@...r.kernel.org
cc: target-devel@...r.kernel.org
cc: netdev@...r.kernel.org
---
Notes:
ver #2)
- Wrap lines at 80.
drivers/scsi/iscsi_tcp.c | 26 +++++++++---------------
drivers/scsi/iscsi_tcp.h | 2 --
drivers/target/iscsi/iscsi_target_util.c | 15 ++++++++------
3 files changed, 19 insertions(+), 24 deletions(-)
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 9637d4bc2bc9..9ab8555180a3 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -301,35 +301,32 @@ static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn,
while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) {
struct scatterlist *sg;
+ struct msghdr msg = {};
+ struct bio_vec bv;
unsigned int offset, copy;
- int flags = 0;
r = 0;
offset = segment->copied;
copy = segment->size - offset;
if (segment->total_copied + segment->size < segment->total_size)
- flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST;
+ msg.msg_flags |= MSG_MORE;
if (tcp_sw_conn->queue_recv)
- flags |= MSG_DONTWAIT;
+ msg.msg_flags |= MSG_DONTWAIT;
- /* Use sendpage if we can; else fall back to sendmsg */
if (!segment->data) {
+ if (!tcp_conn->iscsi_conn->datadgst_en)
+ msg.msg_flags |= MSG_SPLICE_PAGES;
sg = segment->sg;
offset += segment->sg_offset + sg->offset;
- r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset,
- copy, flags);
+ bvec_set_page(&bv, sg_page(sg), copy, offset);
} else {
- struct msghdr msg = { .msg_flags = flags };
- struct kvec iov = {
- .iov_base = segment->data + offset,
- .iov_len = copy
- };
-
- r = kernel_sendmsg(sk, &msg, &iov, 1, copy);
+ bvec_set_virt(&bv, segment->data + offset, copy);
}
+ iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bv, 1, copy);
+ r = sock_sendmsg(sk, &msg);
if (r < 0) {
iscsi_tcp_segment_unmap(segment);
return r;
@@ -746,7 +743,6 @@ iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session,
sock_no_linger(sk);
iscsi_sw_tcp_conn_set_callbacks(conn);
- tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage;
/*
* set receive state machine into initial state
*/
@@ -777,8 +773,6 @@ static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn,
return -ENOTCONN;
}
iscsi_set_param(cls_conn, param, buf, buflen);
- tcp_sw_conn->sendpage = conn->datadgst_en ?
- sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage;
mutex_unlock(&tcp_sw_conn->sock_lock);
break;
case ISCSI_PARAM_MAX_R2T:
diff --git a/drivers/scsi/iscsi_tcp.h b/drivers/scsi/iscsi_tcp.h
index 68e14a344904..89a6fc552f0b 100644
--- a/drivers/scsi/iscsi_tcp.h
+++ b/drivers/scsi/iscsi_tcp.h
@@ -47,8 +47,6 @@ struct iscsi_sw_tcp_conn {
/* MIB custom statistics */
uint32_t sendpage_failures_cnt;
uint32_t discontiguous_hdr_cnt;
-
- ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
};
struct iscsi_sw_tcp_host {
diff --git a/drivers/target/iscsi/iscsi_target_util.c b/drivers/target/iscsi/iscsi_target_util.c
index b14835fcb033..6231fa4ef5c6 100644
--- a/drivers/target/iscsi/iscsi_target_util.c
+++ b/drivers/target/iscsi/iscsi_target_util.c
@@ -1129,6 +1129,8 @@ int iscsit_fe_sendpage_sg(
struct iscsit_conn *conn)
{
struct scatterlist *sg = cmd->first_data_sg;
+ struct bio_vec bvec;
+ struct msghdr msghdr = { .msg_flags = MSG_SPLICE_PAGES, };
struct kvec iov;
u32 tx_hdr_size, data_len;
u32 offset = cmd->first_data_sg_off;
@@ -1172,17 +1174,18 @@ int iscsit_fe_sendpage_sg(
u32 space = (sg->length - offset);
u32 sub_len = min_t(u32, data_len, space);
send_pg:
- tx_sent = conn->sock->ops->sendpage(conn->sock,
- sg_page(sg), sg->offset + offset, sub_len, 0);
+ bvec_set_page(&bvec, sg_page(sg), sub_len, sg->offset + offset);
+ iov_iter_bvec(&msghdr.msg_iter, ITER_SOURCE, &bvec, 1, sub_len);
+
+ tx_sent = conn->sock->ops->sendmsg(conn->sock, &msghdr,
+ sub_len);
if (tx_sent != sub_len) {
if (tx_sent == -EAGAIN) {
- pr_err("tcp_sendpage() returned"
- " -EAGAIN\n");
+ pr_err("sendmsg/splice returned -EAGAIN\n");
goto send_pg;
}
- pr_err("tcp_sendpage() failure: %d\n",
- tx_sent);
+ pr_err("sendmsg/splice failure: %d\n", tx_sent);
return -1;
}
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