Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

Pull networking updates from David Miller:

 1) Add Maglev hashing scheduler to IPVS, from Inju Song.

 2) Lots of new TC subsystem tests from Roman Mashak.

 3) Add TCP zero copy receive and fix delayed acks and autotuning with
    SO_RCVLOWAT, from Eric Dumazet.

 4) Add XDP_REDIRECT support to mlx5 driver, from Jesper Dangaard
    Brouer.

 5) Add ttl inherit support to vxlan, from Hangbin Liu.

 6) Properly separate ipv6 routes into their logically independant
    components. fib6_info for the routing table, and fib6_nh for sets of
    nexthops, which thus can be shared. From David Ahern.

 7) Add bpf_xdp_adjust_tail helper, which can be used to generate ICMP
    messages from XDP programs. From Nikita V. Shirokov.

 8) Lots of long overdue cleanups to the r8169 driver, from Heiner
    Kallweit.

 9) Add BTF ("BPF Type Format"), from Martin KaFai Lau.

10) Add traffic condition monitoring to iwlwifi, from Luca Coelho.

11) Plumb extack down into fib_rules, from Roopa Prabhu.

12) Add Flower classifier offload support to igb, from Vinicius Costa
    Gomes.

13) Add UDP GSO support, from Willem de Bruijn.

14) Add documentation for eBPF helpers, from Quentin Monnet.

15) Add TLS tx offload to mlx5, from Ilya Lesokhin.

16) Allow applications to be given the number of bytes available to read
    on a socket via a control message returned from recvmsg(), from
    Soheil Hassas Yeganeh.

17) Add x86_32 eBPF JIT compiler, from Wang YanQing.

18) Add AF_XDP sockets, with zerocopy support infrastructure as well.
    From Björn Töpel.

19) Remove indirect load support from all of the BPF JITs and handle
    these operations in the verifier by translating them into native BPF
    instead. From Daniel Borkmann.

20) Add GRO support to ipv6 gre tunnels, from Eran Ben Elisha.

21) Allow XDP programs to do lookups in the main kernel routing tables
    for forwarding. From David Ahern.

22) Allow drivers to store hardware state into an ELF section of kernel
    dump vmcore files, and use it in cxgb4. From Rahul Lakkireddy.

23) Various RACK and loss detection improvements in TCP, from Yuchung
    Cheng.

24) Add TCP SACK compression, from Eric Dumazet.

25) Add User Mode Helper support and basic bpfilter infrastructure, from
    Alexei Starovoitov.

26) Support ports and protocol values in RTM_GETROUTE, from Roopa
    Prabhu.

27) Support bulking in ->ndo_xdp_xmit() API, from Jesper Dangaard
    Brouer.

28) Add lots of forwarding selftests, from Petr Machata.

29) Add generic network device failover driver, from Sridhar Samudrala.

* ra.kernel.org:/pub/scm/linux/kernel/git/davem/net-next: (1959 commits)
  strparser: Add __strp_unpause and use it in ktls.
  rxrpc: Fix terminal retransmission connection ID to include the channel
  net: hns3: Optimize PF CMDQ interrupt switching process
  net: hns3: Fix for VF mailbox receiving unknown message
  net: hns3: Fix for VF mailbox cannot receiving PF response
  bnx2x: use the right constant
  Revert "net: sched: cls: Fix offloading when ingress dev is vxlan"
  net: dsa: b53: Fix for brcm tag issue in Cygnus SoC
  enic: fix UDP rss bits
  netdev-FAQ: clarify DaveM's position for stable backports
  rtnetlink: validate attributes in do_setlink()
  mlxsw: Add extack messages for port_{un, }split failures
  netdevsim: Add extack error message for devlink reload
  devlink: Add extack to reload and port_{un, }split operations
  net: metrics: add proper netlink validation
  ipmr: fix error path when ipmr_new_table fails
  ip6mr: only set ip6mr_table from setsockopt when ip6mr_new_table succeeds
  net: hns3: remove unused hclgevf_cfg_func_mta_filter
  netfilter: provide udp*_lib_lookup for nf_tproxy
  qed*: Utilize FW 8.37.2.0
  ...

1 files changed, 766 insertions, 0 deletions

diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
new file mode 100644
index 000000000000..a7a8f8e20ff3
--- /dev/null
+++ b/net/tls/tls_device.c
@@ -0,0 +1,766 @@
+/* Copyright (c) 2018, Mellanox Technologies All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <crypto/aead.h>
+#include <linux/highmem.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <net/dst.h>
+#include <net/inet_connection_sock.h>
+#include <net/tcp.h>
+#include <net/tls.h>
+
+/* device_offload_lock is used to synchronize tls_dev_add
+ * against NETDEV_DOWN notifications.
+ */
+static DECLARE_RWSEM(device_offload_lock);
+
+static void tls_device_gc_task(struct work_struct *work);
+
+static DECLARE_WORK(tls_device_gc_work, tls_device_gc_task);
+static LIST_HEAD(tls_device_gc_list);
+static LIST_HEAD(tls_device_list);
+static DEFINE_SPINLOCK(tls_device_lock);
+
+static void tls_device_free_ctx(struct tls_context *ctx)
+{
+	struct tls_offload_context *offload_ctx = tls_offload_ctx(ctx);
+
+	kfree(offload_ctx);
+	kfree(ctx);
+}
+
+static void tls_device_gc_task(struct work_struct *work)
+{
+	struct tls_context *ctx, *tmp;
+	unsigned long flags;
+	LIST_HEAD(gc_list);
+
+	spin_lock_irqsave(&tls_device_lock, flags);
+	list_splice_init(&tls_device_gc_list, &gc_list);
+	spin_unlock_irqrestore(&tls_device_lock, flags);
+
+	list_for_each_entry_safe(ctx, tmp, &gc_list, list) {
+		struct net_device *netdev = ctx->netdev;
+
+		if (netdev) {
+			netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
+							TLS_OFFLOAD_CTX_DIR_TX);
+			dev_put(netdev);
+		}
+
+		list_del(&ctx->list);
+		tls_device_free_ctx(ctx);
+	}
+}
+
+static void tls_device_queue_ctx_destruction(struct tls_context *ctx)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&tls_device_lock, flags);
+	list_move_tail(&ctx->list, &tls_device_gc_list);
+
+	/* schedule_work inside the spinlock
+	 * to make sure tls_device_down waits for that work.
+	 */
+	schedule_work(&tls_device_gc_work);
+
+	spin_unlock_irqrestore(&tls_device_lock, flags);
+}
+
+/* We assume that the socket is already connected */
+static struct net_device *get_netdev_for_sock(struct sock *sk)
+{
+	struct dst_entry *dst = sk_dst_get(sk);
+	struct net_device *netdev = NULL;
+
+	if (likely(dst)) {
+		netdev = dst->dev;
+		dev_hold(netdev);
+	}
+
+	dst_release(dst);
+
+	return netdev;
+}
+
+static void destroy_record(struct tls_record_info *record)
+{
+	int nr_frags = record->num_frags;
+	skb_frag_t *frag;
+
+	while (nr_frags-- > 0) {
+		frag = &record->frags[nr_frags];
+		__skb_frag_unref(frag);
+	}
+	kfree(record);
+}
+
+static void delete_all_records(struct tls_offload_context *offload_ctx)
+{
+	struct tls_record_info *info, *temp;
+
+	list_for_each_entry_safe(info, temp, &offload_ctx->records_list, list) {
+		list_del(&info->list);
+		destroy_record(info);
+	}
+
+	offload_ctx->retransmit_hint = NULL;
+}
+
+static void tls_icsk_clean_acked(struct sock *sk, u32 acked_seq)
+{
+	struct tls_context *tls_ctx = tls_get_ctx(sk);
+	struct tls_record_info *info, *temp;
+	struct tls_offload_context *ctx;
+	u64 deleted_records = 0;
+	unsigned long flags;
+
+	if (!tls_ctx)
+		return;
+
+	ctx = tls_offload_ctx(tls_ctx);
+
+	spin_lock_irqsave(&ctx->lock, flags);
+	info = ctx->retransmit_hint;
+	if (info && !before(acked_seq, info->end_seq)) {
+		ctx->retransmit_hint = NULL;
+		list_del(&info->list);
+		destroy_record(info);
+		deleted_records++;
+	}
+
+	list_for_each_entry_safe(info, temp, &ctx->records_list, list) {
+		if (before(acked_seq, info->end_seq))
+			break;
+		list_del(&info->list);
+
+		destroy_record(info);
+		deleted_records++;
+	}
+
+	ctx->unacked_record_sn += deleted_records;
+	spin_unlock_irqrestore(&ctx->lock, flags);
+}
+
+/* At this point, there should be no references on this
+ * socket and no in-flight SKBs associated with this
+ * socket, so it is safe to free all the resources.
+ */
+void tls_device_sk_destruct(struct sock *sk)
+{
+	struct tls_context *tls_ctx = tls_get_ctx(sk);
+	struct tls_offload_context *ctx = tls_offload_ctx(tls_ctx);
+
+	if (ctx->open_record)
+		destroy_record(ctx->open_record);
+
+	delete_all_records(ctx);
+	crypto_free_aead(ctx->aead_send);
+	ctx->sk_destruct(sk);
+	clean_acked_data_disable(inet_csk(sk));
+
+	if (refcount_dec_and_test(&tls_ctx->refcount))
+		tls_device_queue_ctx_destruction(tls_ctx);
+}
+EXPORT_SYMBOL(tls_device_sk_destruct);
+
+static void tls_append_frag(struct tls_record_info *record,
+			    struct page_frag *pfrag,
+			    int size)
+{
+	skb_frag_t *frag;
+
+	frag = &record->frags[record->num_frags - 1];
+	if (frag->page.p == pfrag->page &&
+	    frag->page_offset + frag->size == pfrag->offset) {
+		frag->size += size;
+	} else {
+		++frag;
+		frag->page.p = pfrag->page;
+		frag->page_offset = pfrag->offset;
+		frag->size = size;
+		++record->num_frags;
+		get_page(pfrag->page);
+	}
+
+	pfrag->offset += size;
+	record->len += size;
+}
+
+static int tls_push_record(struct sock *sk,
+			   struct tls_context *ctx,
+			   struct tls_offload_context *offload_ctx,
+			   struct tls_record_info *record,
+			   struct page_frag *pfrag,
+			   int flags,
+			   unsigned char record_type)
+{
+	struct tcp_sock *tp = tcp_sk(sk);
+	struct page_frag dummy_tag_frag;
+	skb_frag_t *frag;
+	int i;
+
+	/* fill prepend */
+	frag = &record->frags[0];
+	tls_fill_prepend(ctx,
+			 skb_frag_address(frag),
+			 record->len - ctx->tx.prepend_size,
+			 record_type);
+
+	/* HW doesn't care about the data in the tag, because it fills it. */
+	dummy_tag_frag.page = skb_frag_page(frag);
+	dummy_tag_frag.offset = 0;
+
+	tls_append_frag(record, &dummy_tag_frag, ctx->tx.tag_size);
+	record->end_seq = tp->write_seq + record->len;
+	spin_lock_irq(&offload_ctx->lock);
+	list_add_tail(&record->list, &offload_ctx->records_list);
+	spin_unlock_irq(&offload_ctx->lock);
+	offload_ctx->open_record = NULL;
+	set_bit(TLS_PENDING_CLOSED_RECORD, &ctx->flags);
+	tls_advance_record_sn(sk, &ctx->tx);
+
+	for (i = 0; i < record->num_frags; i++) {
+		frag = &record->frags[i];
+		sg_unmark_end(&offload_ctx->sg_tx_data[i]);
+		sg_set_page(&offload_ctx->sg_tx_data[i], skb_frag_page(frag),
+			    frag->size, frag->page_offset);
+		sk_mem_charge(sk, frag->size);
+		get_page(skb_frag_page(frag));
+	}
+	sg_mark_end(&offload_ctx->sg_tx_data[record->num_frags - 1]);
+
+	/* all ready, send */
+	return tls_push_sg(sk, ctx, offload_ctx->sg_tx_data, 0, flags);
+}
+
+static int tls_create_new_record(struct tls_offload_context *offload_ctx,
+				 struct page_frag *pfrag,
+				 size_t prepend_size)
+{
+	struct tls_record_info *record;
+	skb_frag_t *frag;
+
+	record = kmalloc(sizeof(*record), GFP_KERNEL);
+	if (!record)
+		return -ENOMEM;
+
+	frag = &record->frags[0];
+	__skb_frag_set_page(frag, pfrag->page);
+	frag->page_offset = pfrag->offset;
+	skb_frag_size_set(frag, prepend_size);
+
+	get_page(pfrag->page);
+	pfrag->offset += prepend_size;
+
+	record->num_frags = 1;
+	record->len = prepend_size;
+	offload_ctx->open_record = record;
+	return 0;
+}
+
+static int tls_do_allocation(struct sock *sk,
+			     struct tls_offload_context *offload_ctx,
+			     struct page_frag *pfrag,
+			     size_t prepend_size)
+{
+	int ret;
+
+	if (!offload_ctx->open_record) {
+		if (unlikely(!skb_page_frag_refill(prepend_size, pfrag,
+						   sk->sk_allocation))) {
+			sk->sk_prot->enter_memory_pressure(sk);
+			sk_stream_moderate_sndbuf(sk);
+			return -ENOMEM;
+		}
+
+		ret = tls_create_new_record(offload_ctx, pfrag, prepend_size);
+		if (ret)
+			return ret;
+
+		if (pfrag->size > pfrag->offset)
+			return 0;
+	}
+
+	if (!sk_page_frag_refill(sk, pfrag))
+		return -ENOMEM;
+
+	return 0;
+}
+
+static int tls_push_data(struct sock *sk,
+			 struct iov_iter *msg_iter,
+			 size_t size, int flags,
+			 unsigned char record_type)
+{
+	struct tls_context *tls_ctx = tls_get_ctx(sk);
+	struct tls_offload_context *ctx = tls_offload_ctx(tls_ctx);
+	int tls_push_record_flags = flags | MSG_SENDPAGE_NOTLAST;
+	int more = flags & (MSG_SENDPAGE_NOTLAST | MSG_MORE);
+	struct tls_record_info *record = ctx->open_record;
+	struct page_frag *pfrag;
+	size_t orig_size = size;
+	u32 max_open_record_len;
+	int copy, rc = 0;
+	bool done = false;
+	long timeo;
+
+	if (flags &
+	    ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_SENDPAGE_NOTLAST))
+		return -ENOTSUPP;
+
+	if (sk->sk_err)
+		return -sk->sk_err;
+
+	timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
+	rc = tls_complete_pending_work(sk, tls_ctx, flags, &timeo);
+	if (rc < 0)
+		return rc;
+
+	pfrag = sk_page_frag(sk);
+
+	/* TLS_HEADER_SIZE is not counted as part of the TLS record, and
+	 * we need to leave room for an authentication tag.
+	 */
+	max_open_record_len = TLS_MAX_PAYLOAD_SIZE +
+			      tls_ctx->tx.prepend_size;
+	do {
+		rc = tls_do_allocation(sk, ctx, pfrag,
+				       tls_ctx->tx.prepend_size);
+		if (rc) {
+			rc = sk_stream_wait_memory(sk, &timeo);
+			if (!rc)
+				continue;
+
+			record = ctx->open_record;
+			if (!record)
+				break;
+handle_error:
+			if (record_type != TLS_RECORD_TYPE_DATA) {
+				/* avoid sending partial
+				 * record with type !=
+				 * application_data
+				 */
+				size = orig_size;
+				destroy_record(record);
+				ctx->open_record = NULL;
+			} else if (record->len > tls_ctx->tx.prepend_size) {
+				goto last_record;
+			}
+
+			break;
+		}
+
+		record = ctx->open_record;
+		copy = min_t(size_t, size, (pfrag->size - pfrag->offset));
+		copy = min_t(size_t, copy, (max_open_record_len - record->len));
+
+		if (copy_from_iter_nocache(page_address(pfrag->page) +
+					       pfrag->offset,
+					   copy, msg_iter) != copy) {
+			rc = -EFAULT;
+			goto handle_error;
+		}
+		tls_append_frag(record, pfrag, copy);
+
+		size -= copy;
+		if (!size) {
+last_record:
+			tls_push_record_flags = flags;
+			if (more) {
+				tls_ctx->pending_open_record_frags =
+						record->num_frags;
+				break;
+			}
+
+			done = true;
+		}
+
+		if (done || record->len >= max_open_record_len ||
+		    (record->num_frags >= MAX_SKB_FRAGS - 1)) {
+			rc = tls_push_record(sk,
+					     tls_ctx,
+					     ctx,
+					     record,
+					     pfrag,
+					     tls_push_record_flags,
+					     record_type);
+			if (rc < 0)
+				break;
+		}
+	} while (!done);
+
+	if (orig_size - size > 0)
+		rc = orig_size - size;
+
+	return rc;
+}
+
+int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
+{
+	unsigned char record_type = TLS_RECORD_TYPE_DATA;
+	int rc;
+
+	lock_sock(sk);
+
+	if (unlikely(msg->msg_controllen)) {
+		rc = tls_proccess_cmsg(sk, msg, &record_type);
+		if (rc)
+			goto out;
+	}
+
+	rc = tls_push_data(sk, &msg->msg_iter, size,
+			   msg->msg_flags, record_type);
+
+out:
+	release_sock(sk);
+	return rc;
+}
+
+int tls_device_sendpage(struct sock *sk, struct page *page,
+			int offset, size_t size, int flags)
+{
+	struct iov_iter	msg_iter;
+	char *kaddr = kmap(page);
+	struct kvec iov;
+	int rc;
+
+	if (flags & MSG_SENDPAGE_NOTLAST)
+		flags |= MSG_MORE;
+
+	lock_sock(sk);
+
+	if (flags & MSG_OOB) {
+		rc = -ENOTSUPP;
+		goto out;
+	}
+
+	iov.iov_base = kaddr + offset;
+	iov.iov_len = size;
+	iov_iter_kvec(&msg_iter, WRITE | ITER_KVEC, &iov, 1, size);
+	rc = tls_push_data(sk, &msg_iter, size,
+			   flags, TLS_RECORD_TYPE_DATA);
+	kunmap(page);
+
+out:
+	release_sock(sk);
+	return rc;
+}
+
+struct tls_record_info *tls_get_record(struct tls_offload_context *context,
+				       u32 seq, u64 *p_record_sn)
+{
+	u64 record_sn = context->hint_record_sn;
+	struct tls_record_info *info;
+
+	info = context->retransmit_hint;
+	if (!info ||
+	    before(seq, info->end_seq - info->len)) {
+		/* if retransmit_hint is irrelevant start
+		 * from the beggining of the list
+		 */
+		info = list_first_entry(&context->records_list,
+					struct tls_record_info, list);
+		record_sn = context->unacked_record_sn;
+	}
+
+	list_for_each_entry_from(info, &context->records_list, list) {
+		if (before(seq, info->end_seq)) {
+			if (!context->retransmit_hint ||
+			    after(info->end_seq,
+				  context->retransmit_hint->end_seq)) {
+				context->hint_record_sn = record_sn;
+				context->retransmit_hint = info;
+			}
+			*p_record_sn = record_sn;
+			return info;
+		}
+		record_sn++;
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL(tls_get_record);
+
+static int tls_device_push_pending_record(struct sock *sk, int flags)
+{
+	struct iov_iter	msg_iter;
+
+	iov_iter_kvec(&msg_iter, WRITE | ITER_KVEC, NULL, 0, 0);
+	return tls_push_data(sk, &msg_iter, 0, flags, TLS_RECORD_TYPE_DATA);
+}
+
+int tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
+{
+	u16 nonce_size, tag_size, iv_size, rec_seq_size;
+	struct tls_record_info *start_marker_record;
+	struct tls_offload_context *offload_ctx;
+	struct tls_crypto_info *crypto_info;
+	struct net_device *netdev;
+	char *iv, *rec_seq;
+	struct sk_buff *skb;
+	int rc = -EINVAL;
+	__be64 rcd_sn;
+
+	if (!ctx)
+		goto out;
+
+	if (ctx->priv_ctx_tx) {
+		rc = -EEXIST;
+		goto out;
+	}
+
+	start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL);
+	if (!start_marker_record) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	offload_ctx = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE, GFP_KERNEL);
+	if (!offload_ctx) {
+		rc = -ENOMEM;
+		goto free_marker_record;
+	}
+
+	crypto_info = &ctx->crypto_send;
+	switch (crypto_info->cipher_type) {
+	case TLS_CIPHER_AES_GCM_128:
+		nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
+		tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE;
+		iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
+		iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv;
+		rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE;
+		rec_seq =
+		 ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq;
+		break;
+	default:
+		rc = -EINVAL;
+		goto free_offload_ctx;
+	}
+
+	ctx->tx.prepend_size = TLS_HEADER_SIZE + nonce_size;
+	ctx->tx.tag_size = tag_size;
+	ctx->tx.overhead_size = ctx->tx.prepend_size + ctx->tx.tag_size;
+	ctx->tx.iv_size = iv_size;
+	ctx->tx.iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
+			     GFP_KERNEL);
+	if (!ctx->tx.iv) {
+		rc = -ENOMEM;
+		goto free_offload_ctx;
+	}
+
+	memcpy(ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size);
+
+	ctx->tx.rec_seq_size = rec_seq_size;
+	ctx->tx.rec_seq = kmalloc(rec_seq_size, GFP_KERNEL);
+	if (!ctx->tx.rec_seq) {
+		rc = -ENOMEM;
+		goto free_iv;
+	}
+	memcpy(ctx->tx.rec_seq, rec_seq, rec_seq_size);
+
+	rc = tls_sw_fallback_init(sk, offload_ctx, crypto_info);
+	if (rc)
+		goto free_rec_seq;
+
+	/* start at rec_seq - 1 to account for the start marker record */
+	memcpy(&rcd_sn, ctx->tx.rec_seq, sizeof(rcd_sn));
+	offload_ctx->unacked_record_sn = be64_to_cpu(rcd_sn) - 1;
+
+	start_marker_record->end_seq = tcp_sk(sk)->write_seq;
+	start_marker_record->len = 0;
+	start_marker_record->num_frags = 0;
+
+	INIT_LIST_HEAD(&offload_ctx->records_list);
+	list_add_tail(&start_marker_record->list, &offload_ctx->records_list);
+	spin_lock_init(&offload_ctx->lock);
+	sg_init_table(offload_ctx->sg_tx_data,
+		      ARRAY_SIZE(offload_ctx->sg_tx_data));
+
+	clean_acked_data_enable(inet_csk(sk), &tls_icsk_clean_acked);
+	ctx->push_pending_record = tls_device_push_pending_record;
+	offload_ctx->sk_destruct = sk->sk_destruct;
+
+	/* TLS offload is greatly simplified if we don't send
+	 * SKBs where only part of the payload needs to be encrypted.
+	 * So mark the last skb in the write queue as end of record.
+	 */
+	skb = tcp_write_queue_tail(sk);
+	if (skb)
+		TCP_SKB_CB(skb)->eor = 1;
+
+	refcount_set(&ctx->refcount, 1);
+
+	/* We support starting offload on multiple sockets
+	 * concurrently, so we only need a read lock here.
+	 * This lock must precede get_netdev_for_sock to prevent races between
+	 * NETDEV_DOWN and setsockopt.
+	 */
+	down_read(&device_offload_lock);
+	netdev = get_netdev_for_sock(sk);
+	if (!netdev) {
+		pr_err_ratelimited("%s: netdev not found\n", __func__);
+		rc = -EINVAL;
+		goto release_lock;
+	}
+
+	if (!(netdev->features & NETIF_F_HW_TLS_TX)) {
+		rc = -ENOTSUPP;
+		goto release_netdev;
+	}
+
+	/* Avoid offloading if the device is down
+	 * We don't want to offload new flows after
+	 * the NETDEV_DOWN event
+	 */
+	if (!(netdev->flags & IFF_UP)) {
+		rc = -EINVAL;
+		goto release_netdev;
+	}
+
+	ctx->priv_ctx_tx = offload_ctx;
+	rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_TX,
+					     &ctx->crypto_send,
+					     tcp_sk(sk)->write_seq);
+	if (rc)
+		goto release_netdev;
+
+	ctx->netdev = netdev;
+
+	spin_lock_irq(&tls_device_lock);
+	list_add_tail(&ctx->list, &tls_device_list);
+	spin_unlock_irq(&tls_device_lock);
+
+	sk->sk_validate_xmit_skb = tls_validate_xmit_skb;
+	/* following this assignment tls_is_sk_tx_device_offloaded
+	 * will return true and the context might be accessed
+	 * by the netdev's xmit function.
+	 */
+	smp_store_release(&sk->sk_destruct,
+			  &tls_device_sk_destruct);
+	up_read(&device_offload_lock);
+	goto out;
+
+release_netdev:
+	dev_put(netdev);
+release_lock:
+	up_read(&device_offload_lock);
+	clean_acked_data_disable(inet_csk(sk));
+	crypto_free_aead(offload_ctx->aead_send);
+free_rec_seq:
+	kfree(ctx->tx.rec_seq);
+free_iv:
+	kfree(ctx->tx.iv);
+free_offload_ctx:
+	kfree(offload_ctx);
+	ctx->priv_ctx_tx = NULL;
+free_marker_record:
+	kfree(start_marker_record);
+out:
+	return rc;
+}
+
+static int tls_device_down(struct net_device *netdev)
+{
+	struct tls_context *ctx, *tmp;
+	unsigned long flags;
+	LIST_HEAD(list);
+
+	/* Request a write lock to block new offload attempts */
+	down_write(&device_offload_lock);
+
+	spin_lock_irqsave(&tls_device_lock, flags);
+	list_for_each_entry_safe(ctx, tmp, &tls_device_list, list) {
+		if (ctx->netdev != netdev ||
+		    !refcount_inc_not_zero(&ctx->refcount))
+			continue;
+
+		list_move(&ctx->list, &list);
+	}
+	spin_unlock_irqrestore(&tls_device_lock, flags);
+
+	list_for_each_entry_safe(ctx, tmp, &list, list)	{
+		netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
+						TLS_OFFLOAD_CTX_DIR_TX);
+		ctx->netdev = NULL;
+		dev_put(netdev);
+		list_del_init(&ctx->list);
+
+		if (refcount_dec_and_test(&ctx->refcount))
+			tls_device_free_ctx(ctx);
+	}
+
+	up_write(&device_offload_lock);
+
+	flush_work(&tls_device_gc_work);
+
+	return NOTIFY_DONE;
+}
+
+static int tls_dev_event(struct notifier_block *this, unsigned long event,
+			 void *ptr)
+{
+	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+
+	if (!(dev->features & NETIF_F_HW_TLS_TX))
+		return NOTIFY_DONE;
+
+	switch (event) {
+	case NETDEV_REGISTER:
+	case NETDEV_FEAT_CHANGE:
+		if  (dev->tlsdev_ops &&
+		     dev->tlsdev_ops->tls_dev_add &&
+		     dev->tlsdev_ops->tls_dev_del)
+			return NOTIFY_DONE;
+		else
+			return NOTIFY_BAD;
+	case NETDEV_DOWN:
+		return tls_device_down(dev);
+	}
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block tls_dev_notifier = {
+	.notifier_call	= tls_dev_event,
+};
+
+void __init tls_device_init(void)
+{
+	register_netdevice_notifier(&tls_dev_notifier);
+}
+
+void __exit tls_device_cleanup(void)
+{
+	unregister_netdevice_notifier(&tls_dev_notifier);
+	flush_work(&tls_device_gc_work);
+}