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tls/sw: Support MSG_SPLICE_PAGES

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Make TLS's sendmsg() support MSG_SPLICE_PAGES.  This causes pages to be
spliced from the source iterator if possible.

This allows ->sendpage() to be replaced by something that can handle
multiple multipage folios in a single transaction.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Chuck Lever <chuck.lever@oracle.com>
cc: Boris Pismenny <borisp@nvidia.com>
cc: John Fastabend <john.fastabend@gmail.com>
cc: Jens Axboe <axboe@kernel.dk>
cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
David Howells 2023-06-07 19:19:17 +01:00 committed by Jakub Kicinski
parent 219d92056b
commit fe1e81d4f7
1 changed files with 41 additions and 0 deletions
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41
net/tls/tls_sw.c
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@ -931,6 +931,35 @@ static int tls_sw_push_pending_record(struct sock *sk, int flags)
&copied, flags);
}
static int tls_sw_sendmsg_splice(struct sock *sk, struct msghdr *msg,
struct sk_msg *msg_pl, size_t try_to_copy,
ssize_t *copied)
{
struct page *page = NULL, **pages = &page;
do {
ssize_t part;
size_t off;
part = iov_iter_extract_pages(&msg->msg_iter, &pages,
try_to_copy, 1, 0, &off);
if (part <= 0)
return part ?: -EIO;
if (WARN_ON_ONCE(!sendpage_ok(page))) {
iov_iter_revert(&msg->msg_iter, part);
return -EIO;
}
sk_msg_page_add(msg_pl, page, part, off);
sk_mem_charge(sk, part);
*copied += part;
try_to_copy -= part;
} while (try_to_copy && !sk_msg_full(msg_pl));
return 0;
}
int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
{
long timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
@ -1020,6 +1049,17 @@ int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
full_record = true;
}
if (try_to_copy && (msg->msg_flags & MSG_SPLICE_PAGES)) {
ret = tls_sw_sendmsg_splice(sk, msg, msg_pl,
try_to_copy, &copied);
if (ret < 0)
goto send_end;
tls_ctx->pending_open_record_frags = true;
if (full_record || eor || sk_msg_full(msg_pl))
goto copied;
continue;
}
if (!is_kvec && (full_record || eor) && !async_capable) {
u32 first = msg_pl->sg.end;
@ -1084,6 +1124,7 @@ int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
*/
tls_ctx->pending_open_record_frags = true;
copied += try_to_copy;
copied:
if (full_record || eor) {
ret = bpf_exec_tx_verdict(msg_pl, sk, full_record,
record_type, &copied,