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tls/device: Convert tls_device_sendpage() to use MSG_SPLICE_PAGES
Convert tls_device_sendpage() to use sendmsg() with MSG_SPLICE_PAGES rather than directly splicing in the pages itself. With that, the tls_iter_offset union is no longer necessary and can be replaced with an iov_iter pointer and the zc_page argument to tls_push_data() can also be removed. 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> Acked-by: Jakub Kicinski <kuba@kernel.org> 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>
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24763c9c09
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@ -422,16 +422,10 @@ static int tls_device_copy_data(void *addr, size_t bytes, struct iov_iter *i)
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return 0;
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}
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union tls_iter_offset {
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struct iov_iter *msg_iter;
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int offset;
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};
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static int tls_push_data(struct sock *sk,
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union tls_iter_offset iter_offset,
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struct iov_iter *iter,
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size_t size, int flags,
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unsigned char record_type,
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struct page *zc_page)
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unsigned char record_type)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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struct tls_prot_info *prot = &tls_ctx->prot_info;
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@ -500,22 +494,13 @@ static int tls_push_data(struct sock *sk,
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record = ctx->open_record;
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copy = min_t(size_t, size, max_open_record_len - record->len);
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if (copy && zc_page) {
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struct page_frag zc_pfrag;
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zc_pfrag.page = zc_page;
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zc_pfrag.offset = iter_offset.offset;
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zc_pfrag.size = copy;
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tls_append_frag(record, &zc_pfrag, copy);
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iter_offset.offset += copy;
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} else if (copy && (flags & MSG_SPLICE_PAGES)) {
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if (copy && (flags & MSG_SPLICE_PAGES)) {
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struct page_frag zc_pfrag;
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struct page **pages = &zc_pfrag.page;
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size_t off;
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rc = iov_iter_extract_pages(iter_offset.msg_iter,
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&pages, copy, 1, 0, &off);
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rc = iov_iter_extract_pages(iter, &pages,
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copy, 1, 0, &off);
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if (rc <= 0) {
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if (rc == 0)
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rc = -EIO;
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@ -524,7 +509,7 @@ static int tls_push_data(struct sock *sk,
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copy = rc;
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if (WARN_ON_ONCE(!sendpage_ok(zc_pfrag.page))) {
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iov_iter_revert(iter_offset.msg_iter, copy);
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iov_iter_revert(iter, copy);
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rc = -EIO;
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goto handle_error;
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}
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@ -537,7 +522,7 @@ static int tls_push_data(struct sock *sk,
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rc = tls_device_copy_data(page_address(pfrag->page) +
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pfrag->offset, copy,
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iter_offset.msg_iter);
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iter);
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if (rc)
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goto handle_error;
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tls_append_frag(record, pfrag, copy);
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@ -592,7 +577,6 @@ int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
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{
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unsigned char record_type = TLS_RECORD_TYPE_DATA;
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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union tls_iter_offset iter;
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int rc;
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if (!tls_ctx->zerocopy_sendfile)
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@ -607,8 +591,8 @@ int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
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goto out;
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}
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iter.msg_iter = &msg->msg_iter;
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rc = tls_push_data(sk, iter, size, msg->msg_flags, record_type, NULL);
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rc = tls_push_data(sk, &msg->msg_iter, size, msg->msg_flags,
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record_type);
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out:
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release_sock(sk);
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@ -620,8 +604,7 @@ void tls_device_splice_eof(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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union tls_iter_offset iter;
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struct iov_iter iov_iter = {};
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struct iov_iter iter = {};
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if (!tls_is_partially_sent_record(tls_ctx))
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return;
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@ -630,9 +613,8 @@ void tls_device_splice_eof(struct socket *sock)
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lock_sock(sk);
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if (tls_is_partially_sent_record(tls_ctx)) {
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iov_iter_bvec(&iov_iter, ITER_SOURCE, NULL, 0, 0);
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iter.msg_iter = &iov_iter;
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tls_push_data(sk, iter, 0, 0, TLS_RECORD_TYPE_DATA, NULL);
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iov_iter_bvec(&iter, ITER_SOURCE, NULL, 0, 0);
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tls_push_data(sk, &iter, 0, 0, TLS_RECORD_TYPE_DATA);
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}
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release_sock(sk);
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@ -642,44 +624,18 @@ void tls_device_splice_eof(struct socket *sock)
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int tls_device_sendpage(struct sock *sk, struct page *page,
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int offset, size_t size, int flags)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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union tls_iter_offset iter_offset;
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struct iov_iter msg_iter;
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char *kaddr;
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struct kvec iov;
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int rc;
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struct bio_vec bvec;
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struct msghdr msg = { .msg_flags = flags | MSG_SPLICE_PAGES, };
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if (flags & MSG_SENDPAGE_NOTLAST)
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flags |= MSG_MORE;
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msg.msg_flags |= MSG_MORE;
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mutex_lock(&tls_ctx->tx_lock);
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lock_sock(sk);
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if (flags & MSG_OOB)
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return -EOPNOTSUPP;
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if (flags & MSG_OOB) {
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rc = -EOPNOTSUPP;
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goto out;
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}
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if (tls_ctx->zerocopy_sendfile) {
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iter_offset.offset = offset;
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rc = tls_push_data(sk, iter_offset, size,
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flags, TLS_RECORD_TYPE_DATA, page);
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goto out;
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}
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kaddr = kmap(page);
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iov.iov_base = kaddr + offset;
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iov.iov_len = size;
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iov_iter_kvec(&msg_iter, ITER_SOURCE, &iov, 1, size);
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iter_offset.msg_iter = &msg_iter;
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rc = tls_push_data(sk, iter_offset, size, flags, TLS_RECORD_TYPE_DATA,
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NULL);
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kunmap(page);
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out:
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release_sock(sk);
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mutex_unlock(&tls_ctx->tx_lock);
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return rc;
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bvec_set_page(&bvec, page, size, offset);
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iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bvec, 1, size);
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return tls_device_sendmsg(sk, &msg, size);
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}
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struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context,
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@ -744,12 +700,10 @@ EXPORT_SYMBOL(tls_get_record);
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static int tls_device_push_pending_record(struct sock *sk, int flags)
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{
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union tls_iter_offset iter;
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struct iov_iter msg_iter;
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struct iov_iter iter;
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iov_iter_kvec(&msg_iter, ITER_SOURCE, NULL, 0, 0);
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iter.msg_iter = &msg_iter;
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return tls_push_data(sk, iter, 0, flags, TLS_RECORD_TYPE_DATA, NULL);
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iov_iter_kvec(&iter, ITER_SOURCE, NULL, 0, 0);
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return tls_push_data(sk, &iter, 0, flags, TLS_RECORD_TYPE_DATA);
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}
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void tls_device_write_space(struct sock *sk, struct tls_context *ctx)
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