Merge branch 'nfp-tls-add-basic-TX-offload'

Jakub Kicinski says:

====================
nfp: tls: add basic TX offload

This series adds initial TLS offload support to the nfp driver.
Only TX side is added for now. We need minor adjustments to
the core tls code:
- expose the per-skb fallback helper;
- grow the driver context slightly;
- add a helper to get to the driver state more easily.
We only support TX offload for now, and only if all packets
keep coming in order. For retransmissions we use the
aforementioned software fallback, and in case there are
local drops we completely give up on given TCP stream.

This will obviously be improved soon, this patch set is the
minimal, functional yet easily reviewable chunk.
====================

Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/netronome/Kconfig

···
 	tristate "Netronome(R) NFP4000/NFP6000 NIC driver"
 	depends on PCI && PCI_MSI
 	depends on VXLAN || VXLAN=n
+	depends on TLS && TLS_DEVICE || TLS_DEVICE=n
 	select NET_DEVLINK
 	---help---
 	  This driver supports the Netronome(R) NFP4000/NFP6000 based

drivers/net/ethernet/netronome/nfp/Makefile

···
 	    nfpcore/nfp_rtsym.o \
 	    nfpcore/nfp_target.o \
 	    ccm.o \
+	    ccm_mbox.o \
 	    nfp_asm.o \
 	    nfp_app.o \
 	    nfp_app_nic.o \
···
 	    nfp_port.o \
 	    nfp_shared_buf.o \
 	    nic/main.o
+
+ifeq ($(CONFIG_TLS_DEVICE),y)
+nfp-objs += \
+	    crypto/tls.o
+endif
 
 ifeq ($(CONFIG_NFP_APP_FLOWER),y)
 nfp-objs += \

drivers/net/ethernet/netronome/nfp/ccm.c

···
 #include "nfp_app.h"
 #include "nfp_net.h"
 
-#define NFP_CCM_TYPE_REPLY_BIT		7
-#define __NFP_CCM_REPLY(req)		(BIT(NFP_CCM_TYPE_REPLY_BIT) | (req))
-
 #define ccm_warn(app, msg...)	nn_dp_warn(&(app)->ctrl->dp, msg)
 
 #define NFP_CCM_TAG_ALLOC_SPAN	(U16_MAX / 4)

drivers/net/ethernet/netronome/nfp/ccm.h

···
 #include <linux/wait.h>
 
 struct nfp_app;
+struct nfp_net;
 
 /* Firmware ABI */
 
···
 	NFP_CCM_TYPE_BPF_MAP_GETNEXT	= 6,
 	NFP_CCM_TYPE_BPF_MAP_GETFIRST	= 7,
 	NFP_CCM_TYPE_BPF_BPF_EVENT	= 8,
+	NFP_CCM_TYPE_CRYPTO_RESET	= 9,
+	NFP_CCM_TYPE_CRYPTO_ADD		= 10,
+	NFP_CCM_TYPE_CRYPTO_DEL		= 11,
+	NFP_CCM_TYPE_CRYPTO_UPDATE	= 12,
 	__NFP_CCM_TYPE_MAX,
 };
 
 #define NFP_CCM_ABI_VERSION		1
 
+#define NFP_CCM_TYPE_REPLY_BIT		7
+#define __NFP_CCM_REPLY(req)		(BIT(NFP_CCM_TYPE_REPLY_BIT) | (req))
+
 struct nfp_ccm_hdr {
-	u8 type;
-	u8 ver;
-	__be16 tag;
+	union {
+		struct {
+			u8 type;
+			u8 ver;
+			__be16 tag;
+		};
+		__be32 raw;
+	};
 };
 
 static inline u8 nfp_ccm_get_type(struct sk_buff *skb)
···
 	return hdr->type;
 }
 
-static inline unsigned int nfp_ccm_get_tag(struct sk_buff *skb)
+static inline __be16 __nfp_ccm_get_tag(struct sk_buff *skb)
 {
 	struct nfp_ccm_hdr *hdr;
 
 	hdr = (struct nfp_ccm_hdr *)skb->data;
 
-	return be16_to_cpu(hdr->tag);
+	return hdr->tag;
 }
+
+static inline unsigned int nfp_ccm_get_tag(struct sk_buff *skb)
+{
+	return be16_to_cpu(__nfp_ccm_get_tag(skb));
+}
+
+#define NFP_NET_MBOX_TLV_TYPE		GENMASK(31, 16)
+#define NFP_NET_MBOX_TLV_LEN		GENMASK(15, 0)
+
+enum nfp_ccm_mbox_tlv_type {
+	NFP_NET_MBOX_TLV_TYPE_UNKNOWN	= 0,
+	NFP_NET_MBOX_TLV_TYPE_END	= 1,
+	NFP_NET_MBOX_TLV_TYPE_MSG	= 2,
+	NFP_NET_MBOX_TLV_TYPE_MSG_NOSUP	= 3,
+	NFP_NET_MBOX_TLV_TYPE_RESV	= 4,
+};
 
 /* Implementation */
 
···
 struct sk_buff *
 nfp_ccm_communicate(struct nfp_ccm *ccm, struct sk_buff *skb,
 		    enum nfp_ccm_type type, unsigned int reply_size);
+
+bool nfp_ccm_mbox_fits(struct nfp_net *nn, unsigned int size);
+struct sk_buff *
+nfp_ccm_mbox_alloc(struct nfp_net *nn, unsigned int req_size,
+		   unsigned int reply_size, gfp_t flags);
+int nfp_ccm_mbox_communicate(struct nfp_net *nn, struct sk_buff *skb,
+			     enum nfp_ccm_type type,
+			     unsigned int reply_size,
+			     unsigned int max_reply_size);
 #endif

drivers/net/ethernet/netronome/nfp/ccm_mbox.c

···
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/* Copyright (C) 2019 Netronome Systems, Inc. */
+
+#include <linux/bitfield.h>
+#include <linux/io.h>
+#include <linux/skbuff.h>
+
+#include "ccm.h"
+#include "nfp_net.h"
+
+/* CCM messages via the mailbox.  CMSGs get wrapped into simple TLVs
+ * and copied into the mailbox.  Multiple messages can be copied to
+ * form a batch.  Threads come in with CMSG formed in an skb, then
+ * enqueue that skb onto the request queue.  If threads skb is first
+ * in queue this thread will handle the mailbox operation.  It copies
+ * up to 16 messages into the mailbox (making sure that both requests
+ * and replies will fit.  After FW is done processing the batch it
+ * copies the data out and wakes waiting threads.
+ * If a thread is waiting it either gets its the message completed
+ * (response is copied into the same skb as the request, overwriting
+ * it), or becomes the first in queue.
+ * Completions and next-to-run are signaled via the control buffer
+ * to limit potential cache line bounces.
+ */
+
+#define NFP_CCM_MBOX_BATCH_LIMIT	16
+#define NFP_CCM_TIMEOUT			(NFP_NET_POLL_TIMEOUT * 1000)
+#define NFP_CCM_MAX_QLEN		256
+
+enum nfp_net_mbox_cmsg_state {
+	NFP_NET_MBOX_CMSG_STATE_QUEUED,
+	NFP_NET_MBOX_CMSG_STATE_NEXT,
+	NFP_NET_MBOX_CMSG_STATE_BUSY,
+	NFP_NET_MBOX_CMSG_STATE_REPLY_FOUND,
+	NFP_NET_MBOX_CMSG_STATE_DONE,
+};
+
+/**
+ * struct nfp_ccm_mbox_skb_cb - CCM mailbox specific info
+ * @state:	processing state (/stage) of the message
+ * @err:	error encountered during processing if any
+ * @max_len:	max(request_len, reply_len)
+ * @exp_reply:	expected reply length (0 means don't validate)
+ */
+struct nfp_ccm_mbox_cmsg_cb {
+	enum nfp_net_mbox_cmsg_state state;
+	int err;
+	unsigned int max_len;
+	unsigned int exp_reply;
+};
+
+static u32 nfp_ccm_mbox_max_msg(struct nfp_net *nn)
+{
+	return round_down(nn->tlv_caps.mbox_len, 4) -
+		NFP_NET_CFG_MBOX_SIMPLE_VAL - /* common mbox command header */
+		4 * 2; /* Msg TLV plus End TLV headers */
+}
+
+static void
+nfp_ccm_mbox_msg_init(struct sk_buff *skb, unsigned int exp_reply, int max_len)
+{
+	struct nfp_ccm_mbox_cmsg_cb *cb = (void *)skb->cb;
+
+	cb->state = NFP_NET_MBOX_CMSG_STATE_QUEUED;
+	cb->err = 0;
+	cb->max_len = max_len;
+	cb->exp_reply = exp_reply;
+}
+
+static int nfp_ccm_mbox_maxlen(const struct sk_buff *skb)
+{
+	struct nfp_ccm_mbox_cmsg_cb *cb = (void *)skb->cb;
+
+	return cb->max_len;
+}
+
+static bool nfp_ccm_mbox_done(struct sk_buff *skb)
+{
+	struct nfp_ccm_mbox_cmsg_cb *cb = (void *)skb->cb;
+
+	return cb->state == NFP_NET_MBOX_CMSG_STATE_DONE;
+}
+
+static bool nfp_ccm_mbox_in_progress(struct sk_buff *skb)
+{
+	struct nfp_ccm_mbox_cmsg_cb *cb = (void *)skb->cb;
+
+	return cb->state != NFP_NET_MBOX_CMSG_STATE_QUEUED &&
+	       cb->state != NFP_NET_MBOX_CMSG_STATE_NEXT;
+}
+
+static void nfp_ccm_mbox_set_busy(struct sk_buff *skb)
+{
+	struct nfp_ccm_mbox_cmsg_cb *cb = (void *)skb->cb;
+
+	cb->state = NFP_NET_MBOX_CMSG_STATE_BUSY;
+}
+
+static bool nfp_ccm_mbox_is_first(struct nfp_net *nn, struct sk_buff *skb)
+{
+	return skb_queue_is_first(&nn->mbox_cmsg.queue, skb);
+}
+
+static bool nfp_ccm_mbox_should_run(struct nfp_net *nn, struct sk_buff *skb)
+{
+	struct nfp_ccm_mbox_cmsg_cb *cb = (void *)skb->cb;
+
+	return cb->state == NFP_NET_MBOX_CMSG_STATE_NEXT;
+}
+
+static void nfp_ccm_mbox_mark_next_runner(struct nfp_net *nn)
+{
+	struct nfp_ccm_mbox_cmsg_cb *cb;
+	struct sk_buff *skb;
+
+	skb = skb_peek(&nn->mbox_cmsg.queue);
+	if (!skb)
+		return;
+
+	cb = (void *)skb->cb;
+	cb->state = NFP_NET_MBOX_CMSG_STATE_NEXT;
+}
+
+static void
+nfp_ccm_mbox_write_tlv(struct nfp_net *nn, u32 off, u32 type, u32 len)
+{
+	nn_writel(nn, off,
+		  FIELD_PREP(NFP_NET_MBOX_TLV_TYPE, type) |
+		  FIELD_PREP(NFP_NET_MBOX_TLV_LEN, len));
+}
+
+static void nfp_ccm_mbox_copy_in(struct nfp_net *nn, struct sk_buff *last)
+{
+	struct sk_buff *skb;
+	int reserve, i, cnt;
+	__be32 *data;
+	u32 off, len;
+
+	off = nn->tlv_caps.mbox_off + NFP_NET_CFG_MBOX_SIMPLE_VAL;
+	skb = __skb_peek(&nn->mbox_cmsg.queue);
+	while (true) {
+		nfp_ccm_mbox_write_tlv(nn, off, NFP_NET_MBOX_TLV_TYPE_MSG,
+				       skb->len);
+		off += 4;
+
+		/* Write data word by word, skb->data should be aligned */
+		data = (__be32 *)skb->data;
+		cnt = skb->len / 4;
+		for (i = 0 ; i < cnt; i++) {
+			nn_writel(nn, off, be32_to_cpu(data[i]));
+			off += 4;
+		}
+		if (skb->len & 3) {
+			__be32 tmp = 0;
+
+			memcpy(&tmp, &data[i], skb->len & 3);
+			nn_writel(nn, off, be32_to_cpu(tmp));
+			off += 4;
+		}
+
+		/* Reserve space if reply is bigger */
+		len = round_up(skb->len, 4);
+		reserve = nfp_ccm_mbox_maxlen(skb) - len;
+		if (reserve > 0) {
+			nfp_ccm_mbox_write_tlv(nn, off,
+					       NFP_NET_MBOX_TLV_TYPE_RESV,
+					       reserve);
+			off += 4 + reserve;
+		}
+
+		if (skb == last)
+			break;
+		skb = skb_queue_next(&nn->mbox_cmsg.queue, skb);
+	}
+
+	nfp_ccm_mbox_write_tlv(nn, off, NFP_NET_MBOX_TLV_TYPE_END, 0);
+}
+
+static struct sk_buff *
+nfp_ccm_mbox_find_req(struct nfp_net *nn, __be16 tag, struct sk_buff *last)
+{
+	struct sk_buff *skb;
+
+	skb = __skb_peek(&nn->mbox_cmsg.queue);
+	while (true) {
+		if (__nfp_ccm_get_tag(skb) == tag)
+			return skb;
+
+		if (skb == last)
+			return NULL;
+		skb = skb_queue_next(&nn->mbox_cmsg.queue, skb);
+	}
+}
+
+static void nfp_ccm_mbox_copy_out(struct nfp_net *nn, struct sk_buff *last)
+{
+	struct nfp_ccm_mbox_cmsg_cb *cb;
+	u8 __iomem *data, *end;
+	struct sk_buff *skb;
+
+	data = nn->dp.ctrl_bar + nn->tlv_caps.mbox_off +
+		NFP_NET_CFG_MBOX_SIMPLE_VAL;
+	end = data + nn->tlv_caps.mbox_len;
+
+	while (true) {
+		unsigned int length, offset, type;
+		struct nfp_ccm_hdr hdr;
+		__be32 *skb_data;
+		u32 tlv_hdr;
+		int i, cnt;
+
+		tlv_hdr = readl(data);
+		type = FIELD_GET(NFP_NET_MBOX_TLV_TYPE, tlv_hdr);
+		length = FIELD_GET(NFP_NET_MBOX_TLV_LEN, tlv_hdr);
+		offset = data - nn->dp.ctrl_bar;
+
+		/* Advance past the header */
+		data += 4;
+
+		if (data + length > end) {
+			nn_dp_warn(&nn->dp, "mailbox oversized TLV type:%d offset:%u len:%u\n",
+				   type, offset, length);
+			break;
+		}
+
+		if (type == NFP_NET_MBOX_TLV_TYPE_END)
+			break;
+		if (type == NFP_NET_MBOX_TLV_TYPE_RESV)
+			goto next_tlv;
+		if (type != NFP_NET_MBOX_TLV_TYPE_MSG &&
+		    type != NFP_NET_MBOX_TLV_TYPE_MSG_NOSUP) {
+			nn_dp_warn(&nn->dp, "mailbox unknown TLV type:%d offset:%u len:%u\n",
+				   type, offset, length);
+			break;
+		}
+
+		if (length < 4) {
+			nn_dp_warn(&nn->dp, "mailbox msg too short to contain header TLV type:%d offset:%u len:%u\n",
+				   type, offset, length);
+			break;
+		}
+
+		hdr.raw = cpu_to_be32(readl(data));
+
+		skb = nfp_ccm_mbox_find_req(nn, hdr.tag, last);
+		if (!skb) {
+			nn_dp_warn(&nn->dp, "mailbox request not found:%u\n",
+				   be16_to_cpu(hdr.tag));
+			break;
+		}
+		cb = (void *)skb->cb;
+
+		if (type == NFP_NET_MBOX_TLV_TYPE_MSG_NOSUP) {
+			nn_dp_warn(&nn->dp,
+				   "mailbox msg not supported type:%d\n",
+				   nfp_ccm_get_type(skb));
+			cb->err = -EIO;
+			goto next_tlv;
+		}
+
+		if (hdr.type != __NFP_CCM_REPLY(nfp_ccm_get_type(skb))) {
+			nn_dp_warn(&nn->dp, "mailbox msg reply wrong type:%u expected:%lu\n",
+				   hdr.type,
+				   __NFP_CCM_REPLY(nfp_ccm_get_type(skb)));
+			cb->err = -EIO;
+			goto next_tlv;
+		}
+		if (cb->exp_reply && length != cb->exp_reply) {
+			nn_dp_warn(&nn->dp, "mailbox msg reply wrong size type:%u expected:%u have:%u\n",
+				   hdr.type, length, cb->exp_reply);
+			cb->err = -EIO;
+			goto next_tlv;
+		}
+		if (length > cb->max_len) {
+			nn_dp_warn(&nn->dp, "mailbox msg oversized reply type:%u max:%u have:%u\n",
+				   hdr.type, cb->max_len, length);
+			cb->err = -EIO;
+			goto next_tlv;
+		}
+
+		if (length <= skb->len)
+			__skb_trim(skb, length);
+		else
+			skb_put(skb, length - skb->len);
+
+		/* We overcopy here slightly, but that's okay, the skb is large
+		 * enough, and the garbage will be ignored (beyond skb->len).
+		 */
+		skb_data = (__be32 *)skb->data;
+		memcpy(skb_data, &hdr, 4);
+
+		cnt = DIV_ROUND_UP(length, 4);
+		for (i = 1 ; i < cnt; i++)
+			skb_data[i] = cpu_to_be32(readl(data + i * 4));
+
+		cb->state = NFP_NET_MBOX_CMSG_STATE_REPLY_FOUND;
+next_tlv:
+		data += round_up(length, 4);
+		if (data + 4 > end) {
+			nn_dp_warn(&nn->dp,
+				   "reached end of MBOX without END TLV\n");
+			break;
+		}
+	}
+
+	smp_wmb(); /* order the skb->data vs. cb->state */
+	spin_lock_bh(&nn->mbox_cmsg.queue.lock);
+	do {
+		skb = __skb_dequeue(&nn->mbox_cmsg.queue);
+		cb = (void *)skb->cb;
+
+		if (cb->state != NFP_NET_MBOX_CMSG_STATE_REPLY_FOUND) {
+			cb->err = -ENOENT;
+			smp_wmb(); /* order the cb->err vs. cb->state */
+		}
+		cb->state = NFP_NET_MBOX_CMSG_STATE_DONE;
+	} while (skb != last);
+
+	nfp_ccm_mbox_mark_next_runner(nn);
+	spin_unlock_bh(&nn->mbox_cmsg.queue.lock);
+}
+
+static void
+nfp_ccm_mbox_mark_all_err(struct nfp_net *nn, struct sk_buff *last, int err)
+{
+	struct nfp_ccm_mbox_cmsg_cb *cb;
+	struct sk_buff *skb;
+
+	spin_lock_bh(&nn->mbox_cmsg.queue.lock);
+	do {
+		skb = __skb_dequeue(&nn->mbox_cmsg.queue);
+		cb = (void *)skb->cb;
+
+		cb->err = err;
+		smp_wmb(); /* order the cb->err vs. cb->state */
+		cb->state = NFP_NET_MBOX_CMSG_STATE_DONE;
+	} while (skb != last);
+
+	nfp_ccm_mbox_mark_next_runner(nn);
+	spin_unlock_bh(&nn->mbox_cmsg.queue.lock);
+}
+
+static void nfp_ccm_mbox_run_queue_unlock(struct nfp_net *nn)
+	__releases(&nn->mbox_cmsg.queue.lock)
+{
+	int space = nn->tlv_caps.mbox_len - NFP_NET_CFG_MBOX_SIMPLE_VAL;
+	struct sk_buff *skb, *last;
+	int cnt, err;
+
+	space -= 4; /* for End TLV */
+
+	/* First skb must fit, because it's ours and we checked it fits */
+	cnt = 1;
+	last = skb = __skb_peek(&nn->mbox_cmsg.queue);
+	space -= 4 + nfp_ccm_mbox_maxlen(skb);
+
+	while (!skb_queue_is_last(&nn->mbox_cmsg.queue, last)) {
+		skb = skb_queue_next(&nn->mbox_cmsg.queue, last);
+		space -= 4 + nfp_ccm_mbox_maxlen(skb);
+		if (space < 0)
+			break;
+		last = skb;
+		nfp_ccm_mbox_set_busy(skb);
+		cnt++;
+		if (cnt == NFP_CCM_MBOX_BATCH_LIMIT)
+			break;
+	}
+	spin_unlock_bh(&nn->mbox_cmsg.queue.lock);
+
+	/* Now we own all skb's marked in progress, new requests may arrive
+	 * at the end of the queue.
+	 */
+
+	nn_ctrl_bar_lock(nn);
+
+	nfp_ccm_mbox_copy_in(nn, last);
+
+	err = nfp_net_mbox_reconfig(nn, NFP_NET_CFG_MBOX_CMD_TLV_CMSG);
+	if (!err)
+		nfp_ccm_mbox_copy_out(nn, last);
+	else
+		nfp_ccm_mbox_mark_all_err(nn, last, -EIO);
+
+	nn_ctrl_bar_unlock(nn);
+
+	wake_up_all(&nn->mbox_cmsg.wq);
+}
+
+static int nfp_ccm_mbox_skb_return(struct sk_buff *skb)
+{
+	struct nfp_ccm_mbox_cmsg_cb *cb = (void *)skb->cb;
+
+	if (cb->err)
+		dev_kfree_skb_any(skb);
+	return cb->err;
+}
+
+/* If wait timed out but the command is already in progress we have
+ * to wait until it finishes.  Runners has ownership of the skbs marked
+ * as busy.
+ */
+static int
+nfp_ccm_mbox_unlink_unlock(struct nfp_net *nn, struct sk_buff *skb,
+			   enum nfp_ccm_type type)
+	__releases(&nn->mbox_cmsg.queue.lock)
+{
+	bool was_first;
+
+	if (nfp_ccm_mbox_in_progress(skb)) {
+		spin_unlock_bh(&nn->mbox_cmsg.queue.lock);
+
+		wait_event(nn->mbox_cmsg.wq, nfp_ccm_mbox_done(skb));
+		smp_rmb(); /* pairs with smp_wmb() after data is written */
+		return nfp_ccm_mbox_skb_return(skb);
+	}
+
+	was_first = nfp_ccm_mbox_should_run(nn, skb);
+	__skb_unlink(skb, &nn->mbox_cmsg.queue);
+	if (was_first)
+		nfp_ccm_mbox_mark_next_runner(nn);
+
+	spin_unlock_bh(&nn->mbox_cmsg.queue.lock);
+
+	if (was_first)
+		wake_up_all(&nn->mbox_cmsg.wq);
+
+	nn_dp_warn(&nn->dp, "time out waiting for mbox response to 0x%02x\n",
+		   type);
+	return -ETIMEDOUT;
+}
+
+static int
+nfp_ccm_mbox_msg_prepare(struct nfp_net *nn, struct sk_buff *skb,
+			 enum nfp_ccm_type type,
+			 unsigned int reply_size, unsigned int max_reply_size,
+			 gfp_t flags)
+{
+	const unsigned int mbox_max = nfp_ccm_mbox_max_msg(nn);
+	unsigned int max_len;
+	ssize_t undersize;
+	int err;
+
+	if (unlikely(!(nn->tlv_caps.mbox_cmsg_types & BIT(type)))) {
+		nn_dp_warn(&nn->dp,
+			   "message type %d not supported by mailbox\n", type);
+		return -EINVAL;
+	}
+
+	/* If the reply size is unknown assume it will take the entire
+	 * mailbox, the callers should do their best for this to never
+	 * happen.
+	 */
+	if (!max_reply_size)
+		max_reply_size = mbox_max;
+	max_reply_size = round_up(max_reply_size, 4);
+
+	/* Make sure we can fit the entire reply into the skb,
+	 * and that we don't have to slow down the mbox handler
+	 * with allocations.
+	 */
+	undersize = max_reply_size - (skb_end_pointer(skb) - skb->data);
+	if (undersize > 0) {
+		err = pskb_expand_head(skb, 0, undersize, flags);
+		if (err) {
+			nn_dp_warn(&nn->dp,
+				   "can't allocate reply buffer for mailbox\n");
+			return err;
+		}
+	}
+
+	/* Make sure that request and response both fit into the mailbox */
+	max_len = max(max_reply_size, round_up(skb->len, 4));
+	if (max_len > mbox_max) {
+		nn_dp_warn(&nn->dp,
+			   "message too big for tha mailbox: %u/%u vs %u\n",
+			   skb->len, max_reply_size, mbox_max);
+		return -EMSGSIZE;
+	}
+
+	nfp_ccm_mbox_msg_init(skb, reply_size, max_len);
+
+	return 0;
+}
+
+static int
+nfp_ccm_mbox_msg_enqueue(struct nfp_net *nn, struct sk_buff *skb,
+			 enum nfp_ccm_type type)
+{
+	struct nfp_ccm_hdr *hdr;
+
+	assert_spin_locked(&nn->mbox_cmsg.queue.lock);
+
+	if (nn->mbox_cmsg.queue.qlen >= NFP_CCM_MAX_QLEN) {
+		nn_dp_warn(&nn->dp, "mailbox request queue too long\n");
+		return -EBUSY;
+	}
+
+	hdr = (void *)skb->data;
+	hdr->ver = NFP_CCM_ABI_VERSION;
+	hdr->type = type;
+	hdr->tag = cpu_to_be16(nn->mbox_cmsg.tag++);
+
+	__skb_queue_tail(&nn->mbox_cmsg.queue, skb);
+
+	return 0;
+}
+
+int nfp_ccm_mbox_communicate(struct nfp_net *nn, struct sk_buff *skb,
+			     enum nfp_ccm_type type,
+			     unsigned int reply_size,
+			     unsigned int max_reply_size)
+{
+	int err;
+
+	err = nfp_ccm_mbox_msg_prepare(nn, skb, type, reply_size,
+				       max_reply_size, GFP_KERNEL);
+	if (err)
+		goto err_free_skb;
+
+	spin_lock_bh(&nn->mbox_cmsg.queue.lock);
+
+	err = nfp_ccm_mbox_msg_enqueue(nn, skb, type);
+	if (err)
+		goto err_unlock;
+
+	/* First in queue takes the mailbox lock and processes the batch */
+	if (!nfp_ccm_mbox_is_first(nn, skb)) {
+		bool to;
+
+		spin_unlock_bh(&nn->mbox_cmsg.queue.lock);
+
+		to = !wait_event_timeout(nn->mbox_cmsg.wq,
+					 nfp_ccm_mbox_done(skb) ||
+					 nfp_ccm_mbox_should_run(nn, skb),
+					 msecs_to_jiffies(NFP_CCM_TIMEOUT));
+
+		/* fast path for those completed by another thread */
+		if (nfp_ccm_mbox_done(skb)) {
+			smp_rmb(); /* pairs with wmb after data is written */
+			return nfp_ccm_mbox_skb_return(skb);
+		}
+
+		spin_lock_bh(&nn->mbox_cmsg.queue.lock);
+
+		if (!nfp_ccm_mbox_is_first(nn, skb)) {
+			WARN_ON(!to);
+
+			err = nfp_ccm_mbox_unlink_unlock(nn, skb, type);
+			if (err)
+				goto err_free_skb;
+			return 0;
+		}
+	}
+
+	/* run queue expects the lock held */
+	nfp_ccm_mbox_run_queue_unlock(nn);
+	return nfp_ccm_mbox_skb_return(skb);
+
+err_unlock:
+	spin_unlock_bh(&nn->mbox_cmsg.queue.lock);
+err_free_skb:
+	dev_kfree_skb_any(skb);
+	return err;
+}
+
+struct sk_buff *
+nfp_ccm_mbox_alloc(struct nfp_net *nn, unsigned int req_size,
+		   unsigned int reply_size, gfp_t flags)
+{
+	unsigned int max_size;
+	struct sk_buff *skb;
+
+	if (!reply_size)
+		max_size = nfp_ccm_mbox_max_msg(nn);
+	else
+		max_size = max(req_size, reply_size);
+	max_size = round_up(max_size, 4);
+
+	skb = alloc_skb(max_size, flags);
+	if (!skb)
+		return NULL;
+
+	skb_put(skb, req_size);
+
+	return skb;
+}
+
+bool nfp_ccm_mbox_fits(struct nfp_net *nn, unsigned int size)
+{
+	return nfp_ccm_mbox_max_msg(nn) >= size;
+}

drivers/net/ethernet/netronome/nfp/crypto/crypto.h

···
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+/* Copyright (C) 2019 Netronome Systems, Inc. */
+
+#ifndef NFP_CRYPTO_H
+#define NFP_CRYPTO_H 1
+
+struct nfp_net_tls_offload_ctx {
+	__be32 fw_handle[2];
+
+	u32 next_seq;
+	bool out_of_sync;
+};
+
+#ifdef CONFIG_TLS_DEVICE
+int nfp_net_tls_init(struct nfp_net *nn);
+#else
+static inline int nfp_net_tls_init(struct nfp_net *nn)
+{
+	return 0;
+}
+#endif
+
+#endif

drivers/net/ethernet/netronome/nfp/crypto/fw.h

···
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+/* Copyright (C) 2019 Netronome Systems, Inc. */
+
+#ifndef NFP_CRYPTO_FW_H
+#define NFP_CRYPTO_FW_H 1
+
+#include "../ccm.h"
+
+#define NFP_NET_CRYPTO_OP_TLS_1_2_AES_GCM_128_ENC	0
+#define NFP_NET_CRYPTO_OP_TLS_1_2_AES_GCM_128_DEC	1
+
+struct nfp_crypto_reply_simple {
+	struct nfp_ccm_hdr hdr;
+	__be32 error;
+};
+
+struct nfp_crypto_req_reset {
+	struct nfp_ccm_hdr hdr;
+	__be32 ep_id;
+};
+
+#define NFP_NET_TLS_IPVER		GENMASK(15, 12)
+#define NFP_NET_TLS_VLAN		GENMASK(11, 0)
+#define NFP_NET_TLS_VLAN_UNUSED			4095
+
+struct nfp_crypto_req_add_front {
+	struct nfp_ccm_hdr hdr;
+	__be32 ep_id;
+	u8 resv[3];
+	u8 opcode;
+	u8 key_len;
+	__be16 ipver_vlan __packed;
+	u8 l4_proto;
+};
+
+struct nfp_crypto_req_add_back {
+	__be16 src_port;
+	__be16 dst_port;
+	__be32 key[8];
+	__be32 salt;
+	__be32 iv[2];
+	__be32 counter;
+	__be32 rec_no[2];
+	__be32 tcp_seq;
+};
+
+struct nfp_crypto_req_add_v4 {
+	struct nfp_crypto_req_add_front front;
+	__be32 src_ip;
+	__be32 dst_ip;
+	struct nfp_crypto_req_add_back back;
+};
+
+struct nfp_crypto_req_add_v6 {
+	struct nfp_crypto_req_add_front front;
+	__be32 src_ip[4];
+	__be32 dst_ip[4];
+	struct nfp_crypto_req_add_back back;
+};
+
+struct nfp_crypto_reply_add {
+	struct nfp_ccm_hdr hdr;
+	__be32 error;
+	__be32 handle[2];
+};
+
+struct nfp_crypto_req_del {
+	struct nfp_ccm_hdr hdr;
+	__be32 ep_id;
+	__be32 handle[2];
+};
+
+struct nfp_crypto_req_update {
+	struct nfp_ccm_hdr hdr;
+	__be32 ep_id;
+	u8 resv[3];
+	u8 opcode;
+	__be32 handle[2];
+	__be32 rec_no[2];
+	__be32 tcp_seq;
+};
+#endif

drivers/net/ethernet/netronome/nfp/crypto/tls.c

···
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/* Copyright (C) 2019 Netronome Systems, Inc. */
+
+#include <linux/bitfield.h>
+#include <linux/ipv6.h>
+#include <linux/skbuff.h>
+#include <net/tls.h>
+
+#include "../ccm.h"
+#include "../nfp_net.h"
+#include "crypto.h"
+#include "fw.h"
+
+#define NFP_NET_TLS_CCM_MBOX_OPS_MASK		\
+	(BIT(NFP_CCM_TYPE_CRYPTO_RESET) |	\
+	 BIT(NFP_CCM_TYPE_CRYPTO_ADD) |		\
+	 BIT(NFP_CCM_TYPE_CRYPTO_DEL) |		\
+	 BIT(NFP_CCM_TYPE_CRYPTO_UPDATE))
+
+#define NFP_NET_TLS_OPCODE_MASK_RX			\
+	BIT(NFP_NET_CRYPTO_OP_TLS_1_2_AES_GCM_128_DEC)
+
+#define NFP_NET_TLS_OPCODE_MASK_TX			\
+	BIT(NFP_NET_CRYPTO_OP_TLS_1_2_AES_GCM_128_ENC)
+
+#define NFP_NET_TLS_OPCODE_MASK						\
+	(NFP_NET_TLS_OPCODE_MASK_RX | NFP_NET_TLS_OPCODE_MASK_TX)
+
+static void nfp_net_crypto_set_op(struct nfp_net *nn, u8 opcode, bool on)
+{
+	u32 off, val;
+
+	off = nn->tlv_caps.crypto_enable_off + round_down(opcode / 8, 4);
+
+	val = nn_readl(nn, off);
+	if (on)
+		val |= BIT(opcode & 31);
+	else
+		val &= ~BIT(opcode & 31);
+	nn_writel(nn, off, val);
+}
+
+static bool
+__nfp_net_tls_conn_cnt_changed(struct nfp_net *nn, int add,
+			       enum tls_offload_ctx_dir direction)
+{
+	u8 opcode;
+	int cnt;
+
+	opcode = NFP_NET_CRYPTO_OP_TLS_1_2_AES_GCM_128_ENC;
+	nn->ktls_tx_conn_cnt += add;
+	cnt = nn->ktls_tx_conn_cnt;
+	nn->dp.ktls_tx = !!nn->ktls_tx_conn_cnt;
+
+	/* Care only about 0 -> 1 and 1 -> 0 transitions */
+	if (cnt > 1)
+		return false;
+
+	nfp_net_crypto_set_op(nn, opcode, cnt);
+	return true;
+}
+
+static int
+nfp_net_tls_conn_cnt_changed(struct nfp_net *nn, int add,
+			     enum tls_offload_ctx_dir direction)
+{
+	int ret = 0;
+
+	/* Use the BAR lock to protect the connection counts */
+	nn_ctrl_bar_lock(nn);
+	if (__nfp_net_tls_conn_cnt_changed(nn, add, direction)) {
+		ret = __nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_CRYPTO);
+		/* Undo the cnt adjustment if failed */
+		if (ret)
+			__nfp_net_tls_conn_cnt_changed(nn, -add, direction);
+	}
+	nn_ctrl_bar_unlock(nn);
+
+	return ret;
+}
+
+static int
+nfp_net_tls_conn_add(struct nfp_net *nn, enum tls_offload_ctx_dir direction)
+{
+	return nfp_net_tls_conn_cnt_changed(nn, 1, direction);
+}
+
+static int
+nfp_net_tls_conn_remove(struct nfp_net *nn, enum tls_offload_ctx_dir direction)
+{
+	return nfp_net_tls_conn_cnt_changed(nn, -1, direction);
+}
+
+static struct sk_buff *
+nfp_net_tls_alloc_simple(struct nfp_net *nn, size_t req_sz, gfp_t flags)
+{
+	return nfp_ccm_mbox_alloc(nn, req_sz,
+				  sizeof(struct nfp_crypto_reply_simple),
+				  flags);
+}
+
+static int
+nfp_net_tls_communicate_simple(struct nfp_net *nn, struct sk_buff *skb,
+			       const char *name, enum nfp_ccm_type type)
+{
+	struct nfp_crypto_reply_simple *reply;
+	int err;
+
+	err = nfp_ccm_mbox_communicate(nn, skb, type,
+				       sizeof(*reply), sizeof(*reply));
+	if (err) {
+		nn_dp_warn(&nn->dp, "failed to %s TLS: %d\n", name, err);
+		return err;
+	}
+
+	reply = (void *)skb->data;
+	err = -be32_to_cpu(reply->error);
+	if (err)
+		nn_dp_warn(&nn->dp, "failed to %s TLS, fw replied: %d\n",
+			   name, err);
+	dev_consume_skb_any(skb);
+
+	return err;
+}
+
+static void nfp_net_tls_del_fw(struct nfp_net *nn, __be32 *fw_handle)
+{
+	struct nfp_crypto_req_del *req;
+	struct sk_buff *skb;
+
+	skb = nfp_net_tls_alloc_simple(nn, sizeof(*req), GFP_KERNEL);
+	if (!skb)
+		return;
+
+	req = (void *)skb->data;
+	req->ep_id = 0;
+	memcpy(req->handle, fw_handle, sizeof(req->handle));
+
+	nfp_net_tls_communicate_simple(nn, skb, "delete",
+				       NFP_CCM_TYPE_CRYPTO_DEL);
+}
+
+static struct nfp_crypto_req_add_back *
+nfp_net_tls_set_ipv4(struct nfp_crypto_req_add_v4 *req, struct sock *sk,
+		     int direction)
+{
+	struct inet_sock *inet = inet_sk(sk);
+
+	req->front.key_len += sizeof(__be32) * 2;
+	req->front.ipver_vlan = cpu_to_be16(FIELD_PREP(NFP_NET_TLS_IPVER, 4) |
+					    FIELD_PREP(NFP_NET_TLS_VLAN,
+						       NFP_NET_TLS_VLAN_UNUSED));
+
+	if (direction == TLS_OFFLOAD_CTX_DIR_TX) {
+		req->src_ip = inet->inet_saddr;
+		req->dst_ip = inet->inet_daddr;
+	} else {
+		req->src_ip = inet->inet_daddr;
+		req->dst_ip = inet->inet_saddr;
+	}
+
+	return &req->back;
+}
+
+static struct nfp_crypto_req_add_back *
+nfp_net_tls_set_ipv6(struct nfp_crypto_req_add_v6 *req, struct sock *sk,
+		     int direction)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+	struct ipv6_pinfo *np = inet6_sk(sk);
+
+	req->front.key_len += sizeof(struct in6_addr) * 2;
+	req->front.ipver_vlan = cpu_to_be16(FIELD_PREP(NFP_NET_TLS_IPVER, 6) |
+					    FIELD_PREP(NFP_NET_TLS_VLAN,
+						       NFP_NET_TLS_VLAN_UNUSED));
+
+	if (direction == TLS_OFFLOAD_CTX_DIR_TX) {
+		memcpy(req->src_ip, &np->saddr, sizeof(req->src_ip));
+		memcpy(req->dst_ip, &sk->sk_v6_daddr, sizeof(req->dst_ip));
+	} else {
+		memcpy(req->src_ip, &sk->sk_v6_daddr, sizeof(req->src_ip));
+		memcpy(req->dst_ip, &np->saddr, sizeof(req->dst_ip));
+	}
+
+#endif
+	return &req->back;
+}
+
+static void
+nfp_net_tls_set_l4(struct nfp_crypto_req_add_front *front,
+		   struct nfp_crypto_req_add_back *back, struct sock *sk,
+		   int direction)
+{
+	struct inet_sock *inet = inet_sk(sk);
+
+	front->l4_proto = IPPROTO_TCP;
+
+	if (direction == TLS_OFFLOAD_CTX_DIR_TX) {
+		back->src_port = inet->inet_sport;
+		back->dst_port = inet->inet_dport;
+	} else {
+		back->src_port = inet->inet_dport;
+		back->dst_port = inet->inet_sport;
+	}
+}
+
+static u8 nfp_tls_1_2_dir_to_opcode(enum tls_offload_ctx_dir direction)
+{
+	switch (direction) {
+	case TLS_OFFLOAD_CTX_DIR_TX:
+		return NFP_NET_CRYPTO_OP_TLS_1_2_AES_GCM_128_ENC;
+	case TLS_OFFLOAD_CTX_DIR_RX:
+		return NFP_NET_CRYPTO_OP_TLS_1_2_AES_GCM_128_DEC;
+	default:
+		WARN_ON_ONCE(1);
+		return 0;
+	}
+}
+
+static bool
+nfp_net_cipher_supported(struct nfp_net *nn, u16 cipher_type,
+			 enum tls_offload_ctx_dir direction)
+{
+	u8 bit;
+
+	switch (cipher_type) {
+	case TLS_CIPHER_AES_GCM_128:
+		if (direction == TLS_OFFLOAD_CTX_DIR_TX)
+			bit = NFP_NET_CRYPTO_OP_TLS_1_2_AES_GCM_128_ENC;
+		else
+			return false;
+		break;
+	default:
+		return false;
+	}
+
+	return nn->tlv_caps.crypto_ops & BIT(bit);
+}
+
+static int
+nfp_net_tls_add(struct net_device *netdev, struct sock *sk,
+		enum tls_offload_ctx_dir direction,
+		struct tls_crypto_info *crypto_info,
+		u32 start_offload_tcp_sn)
+{
+	struct tls12_crypto_info_aes_gcm_128 *tls_ci;
+	struct nfp_net *nn = netdev_priv(netdev);
+	struct nfp_crypto_req_add_front *front;
+	struct nfp_net_tls_offload_ctx *ntls;
+	struct nfp_crypto_req_add_back *back;
+	struct nfp_crypto_reply_add *reply;
+	struct sk_buff *skb;
+	size_t req_sz;
+	bool ipv6;
+	int err;
+
+	BUILD_BUG_ON(sizeof(struct nfp_net_tls_offload_ctx) >
+		     TLS_DRIVER_STATE_SIZE_TX);
+
+	if (!nfp_net_cipher_supported(nn, crypto_info->cipher_type, direction))
+		return -EOPNOTSUPP;
+
+	switch (sk->sk_family) {
+#if IS_ENABLED(CONFIG_IPV6)
+	case AF_INET6:
+		if (sk->sk_ipv6only ||
+		    ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) {
+			req_sz = sizeof(struct nfp_crypto_req_add_v6);
+			ipv6 = true;
+			break;
+		}
+#endif
+		/* fall through */
+	case AF_INET:
+		req_sz = sizeof(struct nfp_crypto_req_add_v4);
+		ipv6 = false;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	err = nfp_net_tls_conn_add(nn, direction);
+	if (err)
+		return err;
+
+	skb = nfp_ccm_mbox_alloc(nn, req_sz, sizeof(*reply), GFP_KERNEL);
+	if (!skb) {
+		err = -ENOMEM;
+		goto err_conn_remove;
+	}
+
+	front = (void *)skb->data;
+	front->ep_id = 0;
+	front->key_len = 8;
+	front->opcode = nfp_tls_1_2_dir_to_opcode(direction);
+	memset(front->resv, 0, sizeof(front->resv));
+
+	if (ipv6)
+		back = nfp_net_tls_set_ipv6((void *)skb->data, sk, direction);
+	else
+		back = nfp_net_tls_set_ipv4((void *)skb->data, sk, direction);
+
+	nfp_net_tls_set_l4(front, back, sk, direction);
+
+	back->counter = 0;
+	back->tcp_seq = cpu_to_be32(start_offload_tcp_sn);
+
+	tls_ci = (struct tls12_crypto_info_aes_gcm_128 *)crypto_info;
+	memcpy(back->key, tls_ci->key, TLS_CIPHER_AES_GCM_128_KEY_SIZE);
+	memset(&back->key[TLS_CIPHER_AES_GCM_128_KEY_SIZE / 4], 0,
+	       sizeof(back->key) - TLS_CIPHER_AES_GCM_128_KEY_SIZE);
+	memcpy(back->iv, tls_ci->iv, TLS_CIPHER_AES_GCM_128_IV_SIZE);
+	memcpy(&back->salt, tls_ci->salt, TLS_CIPHER_AES_GCM_128_SALT_SIZE);
+	memcpy(back->rec_no, tls_ci->rec_seq, sizeof(tls_ci->rec_seq));
+
+	err = nfp_ccm_mbox_communicate(nn, skb, NFP_CCM_TYPE_CRYPTO_ADD,
+				       sizeof(*reply), sizeof(*reply));
+	if (err) {
+		nn_dp_warn(&nn->dp, "failed to add TLS: %d\n", err);
+		/* communicate frees skb on error */
+		goto err_conn_remove;
+	}
+
+	reply = (void *)skb->data;
+	err = -be32_to_cpu(reply->error);
+	if (err) {
+		if (err == -ENOSPC) {
+			if (!atomic_fetch_inc(&nn->ktls_no_space))
+				nn_info(nn, "HW TLS table full\n");
+		} else {
+			nn_dp_warn(&nn->dp,
+				   "failed to add TLS, FW replied: %d\n", err);
+		}
+		goto err_free_skb;
+	}
+
+	if (!reply->handle[0] && !reply->handle[1]) {
+		nn_dp_warn(&nn->dp, "FW returned NULL handle\n");
+		goto err_fw_remove;
+	}
+
+	ntls = tls_driver_ctx(sk, direction);
+	memcpy(ntls->fw_handle, reply->handle, sizeof(ntls->fw_handle));
+	ntls->next_seq = start_offload_tcp_sn;
+	dev_consume_skb_any(skb);
+
+	return 0;
+
+err_fw_remove:
+	nfp_net_tls_del_fw(nn, reply->handle);
+err_free_skb:
+	dev_consume_skb_any(skb);
+err_conn_remove:
+	nfp_net_tls_conn_remove(nn, direction);
+	return err;
+}
+
+static void
+nfp_net_tls_del(struct net_device *netdev, struct tls_context *tls_ctx,
+		enum tls_offload_ctx_dir direction)
+{
+	struct nfp_net *nn = netdev_priv(netdev);
+	struct nfp_net_tls_offload_ctx *ntls;
+
+	nfp_net_tls_conn_remove(nn, direction);
+
+	ntls = __tls_driver_ctx(tls_ctx, direction);
+	nfp_net_tls_del_fw(nn, ntls->fw_handle);
+}
+
+static const struct tlsdev_ops nfp_net_tls_ops = {
+	.tls_dev_add = nfp_net_tls_add,
+	.tls_dev_del = nfp_net_tls_del,
+};
+
+static int nfp_net_tls_reset(struct nfp_net *nn)
+{
+	struct nfp_crypto_req_reset *req;
+	struct sk_buff *skb;
+
+	skb = nfp_net_tls_alloc_simple(nn, sizeof(*req), GFP_KERNEL);
+	if (!skb)
+		return -ENOMEM;
+
+	req = (void *)skb->data;
+	req->ep_id = 0;
+
+	return nfp_net_tls_communicate_simple(nn, skb, "reset",
+					      NFP_CCM_TYPE_CRYPTO_RESET);
+}
+
+int nfp_net_tls_init(struct nfp_net *nn)
+{
+	struct net_device *netdev = nn->dp.netdev;
+	int err;
+
+	if (!(nn->tlv_caps.crypto_ops & NFP_NET_TLS_OPCODE_MASK))
+		return 0;
+
+	if ((nn->tlv_caps.mbox_cmsg_types & NFP_NET_TLS_CCM_MBOX_OPS_MASK) !=
+	    NFP_NET_TLS_CCM_MBOX_OPS_MASK)
+		return 0;
+
+	if (!nfp_ccm_mbox_fits(nn, sizeof(struct nfp_crypto_req_add_v6))) {
+		nn_warn(nn, "disabling TLS offload - mbox too small: %d\n",
+			nn->tlv_caps.mbox_len);
+		return 0;
+	}
+
+	err = nfp_net_tls_reset(nn);
+	if (err)
+		return err;
+
+	nn_ctrl_bar_lock(nn);
+	nn_writel(nn, nn->tlv_caps.crypto_enable_off, 0);
+	err = __nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_CRYPTO);
+	nn_ctrl_bar_unlock(nn);
+	if (err)
+		return err;
+
+	if (nn->tlv_caps.crypto_ops & NFP_NET_TLS_OPCODE_MASK_TX) {
+		netdev->hw_features |= NETIF_F_HW_TLS_TX;
+		netdev->features |= NETIF_F_HW_TLS_TX;
+	}
+
+	netdev->tlsdev_ops = &nfp_net_tls_ops;
+
+	return 0;
+}

drivers/net/ethernet/netronome/nfp/nfp_net.h

···
 #ifndef _NFP_NET_H_
 #define _NFP_NET_H_
 
+#include <linux/atomic.h>
 #include <linux/interrupt.h>
 #include <linux/list.h>
 #include <linux/netdevice.h>
 #include <linux/pci.h>
 #include <linux/io-64-nonatomic-hi-lo.h>
+#include <linux/semaphore.h>
 #include <net/xdp.h>
 
 #include "nfp_net_ctrl.h"
···
  * @hw_csum_tx_inner:	 Counter of inner TX checksum offload requests
  * @tx_gather:	    Counter of packets with Gather DMA
  * @tx_lso:	    Counter of LSO packets sent
+ * @hw_tls_tx:	    Counter of TLS packets sent with crypto offloaded to HW
+ * @tls_tx_fallback:	Counter of TLS packets sent which had to be encrypted
+ *			by the fallback path because packets came out of order
+ * @tls_tx_no_fallback:	Counter of TLS packets not sent because the fallback
+ *			path could not encrypt them
  * @tx_errors:	    How many TX errors were encountered
  * @tx_busy:        How often was TX busy (no space)?
  * @rx_replace_buf_alloc_fail:	Counter of RX buffer allocation failures
···
 	u64 hw_csum_rx_inner_ok;
 	u64 hw_csum_rx_complete;
 
+	u64 hw_csum_rx_error;
+	u64 rx_replace_buf_alloc_fail;
+
 	struct nfp_net_tx_ring *xdp_ring;
 
 	struct u64_stats_sync tx_sync;
 	u64 tx_pkts;
 	u64 tx_bytes;
-	u64 hw_csum_tx;
+
+	u64 ____cacheline_aligned_in_smp hw_csum_tx;
 	u64 hw_csum_tx_inner;
 	u64 tx_gather;
 	u64 tx_lso;
+	u64 hw_tls_tx;
 
-	u64 hw_csum_rx_error;
-	u64 rx_replace_buf_alloc_fail;
+	u64 tls_tx_fallback;
+	u64 tls_tx_no_fallback;
 	u64 tx_errors;
 	u64 tx_busy;
+
+	/* Cold data follows */
 
 	u32 irq_vector;
 	irq_handler_t handler;
···
  * @netdev:		Backpointer to net_device structure
  * @is_vf:		Is the driver attached to a VF?
  * @chained_metadata_format:  Firemware will use new metadata format
+ * @ktls_tx:		Is kTLS TX enabled?
  * @rx_dma_dir:		Mapping direction for RX buffers
  * @rx_dma_off:		Offset at which DMA packets (for XDP headroom)
  * @rx_offset:		Offset in the RX buffers where packet data starts
···
 
 	u8 is_vf:1;
 	u8 chained_metadata_format:1;
+	u8 ktls_tx:1;
 
 	u8 rx_dma_dir;
 	u8 rx_offset;
···
  * @reconfig_timer:	Timer for async reading of reconfig results
  * @reconfig_in_progress_update:	Update FW is processing now (debug only)
  * @bar_lock:		vNIC config BAR access lock, protects: update,
- *			mailbox area
+ *			mailbox area, crypto TLV
  * @link_up:            Is the link up?
  * @link_status_lock:	Protects @link_* and ensures atomicity with BAR reading
  * @rx_coalesce_usecs:      RX interrupt moderation usecs delay parameter
···
  * @tx_bar:             Pointer to mapped TX queues
  * @rx_bar:             Pointer to mapped FL/RX queues
  * @tlv_caps:		Parsed TLV capabilities
+ * @ktls_tx_conn_cnt:	Number of offloaded kTLS TX connections
+ * @ktls_no_space:	Counter of firmware rejecting kTLS connection due to
+ *			lack of space
+ * @mbox_cmsg:		Common Control Message via vNIC mailbox state
+ * @mbox_cmsg.queue:	CCM mbox queue of pending messages
+ * @mbox_cmsg.wq:	CCM mbox wait queue of waiting processes
+ * @mbox_cmsg.tag:	CCM mbox message tag allocator
  * @debugfs_dir:	Device directory in debugfs
  * @vnic_list:		Entry on device vNIC list
  * @pdev:		Backpointer to PCI device
···
 	struct timer_list reconfig_timer;
 	u32 reconfig_in_progress_update;
 
-	struct mutex bar_lock;
+	struct semaphore bar_lock;
 
 	u32 rx_coalesce_usecs;
 	u32 rx_coalesce_max_frames;
···
 	u8 __iomem *rx_bar;
 
 	struct nfp_net_tlv_caps tlv_caps;
+
+	unsigned int ktls_tx_conn_cnt;
+
+	atomic_t ktls_no_space;
+
+	struct {
+		struct sk_buff_head queue;
+		wait_queue_head_t wq;
+		u16 tag;
+	} mbox_cmsg;
 
 	struct dentry *debugfs_dir;
 
···
 
 static inline void nn_ctrl_bar_lock(struct nfp_net *nn)
 {
-	mutex_lock(&nn->bar_lock);
+	down(&nn->bar_lock);
 }
 
 static inline void nn_ctrl_bar_unlock(struct nfp_net *nn)
 {
-	mutex_unlock(&nn->bar_lock);
+	up(&nn->bar_lock);
 }
 
 /* Globals */
···
 
 void nfp_net_set_ethtool_ops(struct net_device *netdev);
 void nfp_net_info(struct nfp_net *nn);
+int __nfp_net_reconfig(struct nfp_net *nn, u32 update);
 int nfp_net_reconfig(struct nfp_net *nn, u32 update);
 unsigned int nfp_net_rss_key_sz(struct nfp_net *nn);
 void nfp_net_rss_write_itbl(struct nfp_net *nn);

drivers/net/ethernet/netronome/nfp/nfp_net_common.c

···
 #include <linux/interrupt.h>
 #include <linux/ip.h>
 #include <linux/ipv6.h>
-#include <linux/lockdep.h>
 #include <linux/mm.h>
 #include <linux/overflow.h>
 #include <linux/page_ref.h>
···
 #include <linux/vmalloc.h>
 #include <linux/ktime.h>
 
+#include <net/tls.h>
 #include <net/vxlan.h>
 
 #include "nfpcore/nfp_nsp.h"
···
 #include "nfp_net.h"
 #include "nfp_net_sriov.h"
 #include "nfp_port.h"
+#include "crypto/crypto.h"
 
 /**
  * nfp_net_get_fw_version() - Read and parse the FW version
···
  *
  * Return: Negative errno on error, 0 on success
  */
-static int __nfp_net_reconfig(struct nfp_net *nn, u32 update)
+int __nfp_net_reconfig(struct nfp_net *nn, u32 update)
 {
 	int ret;
-
-	lockdep_assert_held(&nn->bar_lock);
 
 	nfp_net_reconfig_sync_enter(nn);
 
···
 	u32 mbox = nn->tlv_caps.mbox_off;
 	int ret;
 
-	lockdep_assert_held(&nn->bar_lock);
 	nn_writeq(nn, mbox + NFP_NET_CFG_MBOX_SIMPLE_CMD, mbox_cmd);
 
 	ret = __nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_MBOX);
···
 	u64_stats_update_end(&r_vec->tx_sync);
 }
 
+#ifdef CONFIG_TLS_DEVICE
+static struct sk_buff *
+nfp_net_tls_tx(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,
+	       struct sk_buff *skb, u64 *tls_handle, int *nr_frags)
+{
+	struct nfp_net_tls_offload_ctx *ntls;
+	struct sk_buff *nskb;
+	u32 datalen, seq;
+
+	if (likely(!dp->ktls_tx))
+		return skb;
+	if (!skb->sk || !tls_is_sk_tx_device_offloaded(skb->sk))
+		return skb;
+
+	datalen = skb->len - (skb_transport_offset(skb) + tcp_hdrlen(skb));
+	seq = ntohl(tcp_hdr(skb)->seq);
+	ntls = tls_driver_ctx(skb->sk, TLS_OFFLOAD_CTX_DIR_TX);
+	if (unlikely(ntls->next_seq != seq || ntls->out_of_sync)) {
+		/* Pure ACK out of order already */
+		if (!datalen)
+			return skb;
+
+		u64_stats_update_begin(&r_vec->tx_sync);
+		r_vec->tls_tx_fallback++;
+		u64_stats_update_end(&r_vec->tx_sync);
+
+		nskb = tls_encrypt_skb(skb);
+		if (!nskb) {
+			u64_stats_update_begin(&r_vec->tx_sync);
+			r_vec->tls_tx_no_fallback++;
+			u64_stats_update_end(&r_vec->tx_sync);
+			return NULL;
+		}
+		/* encryption wasn't necessary */
+		if (nskb == skb)
+			return skb;
+		/* we don't re-check ring space */
+		if (unlikely(skb_is_nonlinear(nskb))) {
+			nn_dp_warn(dp, "tls_encrypt_skb() produced fragmented frame\n");
+			u64_stats_update_begin(&r_vec->tx_sync);
+			r_vec->tx_errors++;
+			u64_stats_update_end(&r_vec->tx_sync);
+			dev_kfree_skb_any(nskb);
+			return NULL;
+		}
+
+		/* jump forward, a TX may have gotten lost, need to sync TX */
+		if (!ntls->out_of_sync && seq - ntls->next_seq < U32_MAX / 4)
+			ntls->out_of_sync = true;
+
+		*nr_frags = 0;
+		return nskb;
+	}
+
+	if (datalen) {
+		u64_stats_update_begin(&r_vec->tx_sync);
+		r_vec->hw_tls_tx++;
+		u64_stats_update_end(&r_vec->tx_sync);
+	}
+
+	memcpy(tls_handle, ntls->fw_handle, sizeof(ntls->fw_handle));
+	ntls->next_seq += datalen;
+	return skb;
+}
+#endif
+
 static void nfp_net_tx_xmit_more_flush(struct nfp_net_tx_ring *tx_ring)
 {
 	wmb();
···
 	tx_ring->wr_ptr_add = 0;
 }
 
-static int nfp_net_prep_port_id(struct sk_buff *skb)
+static int nfp_net_prep_tx_meta(struct sk_buff *skb, u64 tls_handle)
 {
 	struct metadata_dst *md_dst = skb_metadata_dst(skb);
 	unsigned char *data;
+	u32 meta_id = 0;
+	int md_bytes;
 
-	if (likely(!md_dst))
+	if (likely(!md_dst && !tls_handle))
 		return 0;
-	if (unlikely(md_dst->type != METADATA_HW_PORT_MUX))
-		return 0;
+	if (unlikely(md_dst && md_dst->type != METADATA_HW_PORT_MUX)) {
+		if (!tls_handle)
+			return 0;
+		md_dst = NULL;
+	}
 
-	if (unlikely(skb_cow_head(skb, 8)))
+	md_bytes = 4 + !!md_dst * 4 + !!tls_handle * 8;
+
+	if (unlikely(skb_cow_head(skb, md_bytes)))
 		return -ENOMEM;
 
-	data = skb_push(skb, 8);
-	put_unaligned_be32(NFP_NET_META_PORTID, data);
-	put_unaligned_be32(md_dst->u.port_info.port_id, data + 4);
+	meta_id = 0;
+	data = skb_push(skb, md_bytes) + md_bytes;
+	if (md_dst) {
+		data -= 4;
+		put_unaligned_be32(md_dst->u.port_info.port_id, data);
+		meta_id = NFP_NET_META_PORTID;
+	}
+	if (tls_handle) {
+		/* conn handle is opaque, we just use u64 to be able to quickly
+		 * compare it to zero
+		 */
+		data -= 8;
+		memcpy(data, &tls_handle, sizeof(tls_handle));
+		meta_id <<= NFP_NET_META_FIELD_SIZE;
+		meta_id |= NFP_NET_META_CONN_HANDLE;
+	}
 
-	return 8;
+	data -= 4;
+	put_unaligned_be32(meta_id, data);
+
+	return md_bytes;
 }
 
 /**
···
 	struct nfp_net_dp *dp;
 	dma_addr_t dma_addr;
 	unsigned int fsize;
+	u64 tls_handle = 0;
 	u16 qidx;
 
 	dp = &nn->dp;
···
 		return NETDEV_TX_BUSY;
 	}
 
-	md_bytes = nfp_net_prep_port_id(skb);
-	if (unlikely(md_bytes < 0)) {
+#ifdef CONFIG_TLS_DEVICE
+	skb = nfp_net_tls_tx(dp, r_vec, skb, &tls_handle, &nr_frags);
+	if (unlikely(!skb)) {
 		nfp_net_tx_xmit_more_flush(tx_ring);
-		dev_kfree_skb_any(skb);
 		return NETDEV_TX_OK;
 	}
+#endif
+
+	md_bytes = nfp_net_prep_tx_meta(skb, tls_handle);
+	if (unlikely(md_bytes < 0))
+		goto err_flush;
 
 	/* Start with the head skbuf */
 	dma_addr = dma_map_single(dp->dev, skb->data, skb_headlen(skb),
 				  DMA_TO_DEVICE);
 	if (dma_mapping_error(dp->dev, dma_addr))
-		goto err_free;
+		goto err_dma_err;
 
 	wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
 
···
 	tx_ring->txbufs[wr_idx].skb = NULL;
 	tx_ring->txbufs[wr_idx].dma_addr = 0;
 	tx_ring->txbufs[wr_idx].fidx = -2;
-err_free:
+err_dma_err:
 	nn_dp_warn(dp, "Failed to map DMA TX buffer\n");
+err_flush:
 	nfp_net_tx_xmit_more_flush(tx_ring);
 	u64_stats_update_begin(&r_vec->tx_sync);
 	r_vec->tx_errors++;
···
 	nn->dp.txd_cnt = NFP_NET_TX_DESCS_DEFAULT;
 	nn->dp.rxd_cnt = NFP_NET_RX_DESCS_DEFAULT;
 
-	mutex_init(&nn->bar_lock);
+	sema_init(&nn->bar_lock, 1);
 
 	spin_lock_init(&nn->reconfig_lock);
 	spin_lock_init(&nn->link_status_lock);
 
 	timer_setup(&nn->reconfig_timer, nfp_net_reconfig_timer, 0);
+
+	skb_queue_head_init(&nn->mbox_cmsg.queue);
+	init_waitqueue_head(&nn->mbox_cmsg.wq);
 
 	err = nfp_net_tlv_caps_parse(&nn->pdev->dev, nn->dp.ctrl_bar,
 				     &nn->tlv_caps);
···
 void nfp_net_free(struct nfp_net *nn)
 {
 	WARN_ON(timer_pending(&nn->reconfig_timer) || nn->reconfig_posted);
-
-	mutex_destroy(&nn->bar_lock);
+	WARN_ON(!skb_queue_empty(&nn->mbox_cmsg.queue));
 
 	if (nn->dp.netdev)
 		free_netdev(nn->dp.netdev);
···
 	if (err)
 		return err;
 
-	if (nn->dp.netdev)
+	if (nn->dp.netdev) {
 		nfp_net_netdev_init(nn);
+
+		err = nfp_net_tls_init(nn);
+		if (err)
+			return err;
+	}
 
 	nfp_net_vecs_init(nn);
 

drivers/net/ethernet/netronome/nfp/nfp_net_ctrl.c

···
 
 			caps->repr_cap = readl(data);
 			break;
+		case NFP_NET_CFG_TLV_TYPE_MBOX_CMSG_TYPES:
+			if (length >= 4)
+				caps->mbox_cmsg_types = readl(data);
+			break;
+		case NFP_NET_CFG_TLV_TYPE_CRYPTO_OPS:
+			if (length < 32) {
+				dev_err(dev,
+					"CRYPTO OPS TLV should be at least 32B, is %dB offset:%u\n",
+					length, offset);
+				return -EINVAL;
+			}
+
+			caps->crypto_ops = readl(data);
+			caps->crypto_enable_off = data - ctrl_mem + 16;
+			break;
 		default:
 			if (!FIELD_GET(NFP_NET_CFG_TLV_HEADER_REQUIRED, hdr))
 				break;

drivers/net/ethernet/netronome/nfp/nfp_net_ctrl.h

···
 #define NFP_NET_META_MARK		2
 #define NFP_NET_META_PORTID		5
 #define NFP_NET_META_CSUM		6 /* checksum complete type */
+#define NFP_NET_META_CONN_HANDLE	7
 
 #define NFP_META_PORT_ID_CTRL		~0U
 
···
 #define   NFP_NET_CFG_UPDATE_MACADDR	  (0x1 << 11) /* MAC address change */
 #define   NFP_NET_CFG_UPDATE_MBOX	  (0x1 << 12) /* Mailbox update */
 #define   NFP_NET_CFG_UPDATE_VF		  (0x1 << 13) /* VF settings change */
+#define   NFP_NET_CFG_UPDATE_CRYPTO	  (0x1 << 14) /* Crypto on/off */
 #define   NFP_NET_CFG_UPDATE_ERR	  (0x1 << 31) /* A error occurred */
 #define NFP_NET_CFG_TXRS_ENABLE		0x0008
 #define NFP_NET_CFG_RXRS_ENABLE		0x0010
···
 #define NFP_NET_CFG_MBOX_CMD_CTAG_FILTER_KILL 2
 
 #define NFP_NET_CFG_MBOX_CMD_PCI_DSCP_PRIOMAP_SET	5
+#define NFP_NET_CFG_MBOX_CMD_TLV_CMSG			6
 
 /**
  * VLAN filtering using general use mailbox
···
  * %NFP_NET_CFG_TLV_TYPE_REPR_CAP:
  * Single word, equivalent of %NFP_NET_CFG_CAP for representors, features which
  * can be used on representors.
+ *
+ * %NFP_NET_CFG_TLV_TYPE_MBOX_CMSG_TYPES:
+ * Variable, bitmap of control message types supported by the mailbox handler.
+ * Bit 0 corresponds to message type 0, bit 1 to 1, etc.  Control messages are
+ * encapsulated into simple TLVs, with an end TLV and written to the Mailbox.
+ *
+ * %NFP_NET_CFG_TLV_TYPE_CRYPTO_OPS:
+ * 8 words, bitmaps of supported and enabled crypto operations.
+ * First 16B (4 words) contains a bitmap of supported crypto operations,
+ * and next 16B contain the enabled operations.
  */
 #define NFP_NET_CFG_TLV_TYPE_UNKNOWN		0
 #define NFP_NET_CFG_TLV_TYPE_RESERVED		1
···
 #define NFP_NET_CFG_TLV_TYPE_EXPERIMENTAL0	5
 #define NFP_NET_CFG_TLV_TYPE_EXPERIMENTAL1	6
 #define NFP_NET_CFG_TLV_TYPE_REPR_CAP		7
+#define NFP_NET_CFG_TLV_TYPE_MBOX_CMSG_TYPES	10
+#define NFP_NET_CFG_TLV_TYPE_CRYPTO_OPS		11 /* see crypto/fw.h */
 
 struct device;
 
···
  * @mbox_off:		vNIC mailbox area offset
  * @mbox_len:		vNIC mailbox area length
  * @repr_cap:		capabilities for representors
+ * @mbox_cmsg_types:	cmsgs which can be passed through the mailbox
+ * @crypto_ops:		supported crypto operations
+ * @crypto_enable_off:	offset of crypto ops enable region
  */
 struct nfp_net_tlv_caps {
 	u32 me_freq_mhz;
 	unsigned int mbox_off;
 	unsigned int mbox_len;
 	u32 repr_cap;
+	u32 mbox_cmsg_types;
+	u32 crypto_ops;
+	unsigned int crypto_enable_off;
 };
 
 int nfp_net_tlv_caps_parse(struct device *dev, u8 __iomem *ctrl_mem,

drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c

···
 
 #define NN_ET_GLOBAL_STATS_LEN ARRAY_SIZE(nfp_net_et_stats)
 #define NN_ET_SWITCH_STATS_LEN 9
-#define NN_RVEC_GATHER_STATS	9
+#define NN_RVEC_GATHER_STATS	12
 #define NN_RVEC_PER_Q_STATS	3
+#define NN_CTRL_PATH_STATS	1
 
 #define SFP_SFF_REV_COMPLIANCE	1
 
···
 {
 	struct nfp_net *nn = netdev_priv(netdev);
 
-	return NN_RVEC_GATHER_STATS + nn->max_r_vecs * NN_RVEC_PER_Q_STATS;
+	return NN_RVEC_GATHER_STATS + nn->max_r_vecs * NN_RVEC_PER_Q_STATS +
+		NN_CTRL_PATH_STATS;
 }
 
 static u8 *nfp_vnic_get_sw_stats_strings(struct net_device *netdev, u8 *data)
···
 	data = nfp_pr_et(data, "hw_tx_inner_csum");
 	data = nfp_pr_et(data, "tx_gather");
 	data = nfp_pr_et(data, "tx_lso");
+	data = nfp_pr_et(data, "tx_tls_encrypted");
+	data = nfp_pr_et(data, "tx_tls_ooo");
+	data = nfp_pr_et(data, "tx_tls_drop_no_sync_data");
+
+	data = nfp_pr_et(data, "hw_tls_no_space");
 
 	return data;
 }
···
 			tmp[6] = nn->r_vecs[i].hw_csum_tx_inner;
 			tmp[7] = nn->r_vecs[i].tx_gather;
 			tmp[8] = nn->r_vecs[i].tx_lso;
+			tmp[9] = nn->r_vecs[i].hw_tls_tx;
+			tmp[10] = nn->r_vecs[i].tls_tx_fallback;
+			tmp[11] = nn->r_vecs[i].tls_tx_no_fallback;
 		} while (u64_stats_fetch_retry(&nn->r_vecs[i].tx_sync, start));
 
 		data += NN_RVEC_PER_Q_STATS;
···
 
 	for (j = 0; j < NN_RVEC_GATHER_STATS; j++)
 		*data++ = gathered_stats[j];
+
+	*data++ = atomic_read(&nn->ktls_no_space);
 
 	return data;
 }

include/net/tls.h

···
 #include <linux/socket.h>
 #include <linux/tcp.h>
 #include <linux/skmsg.h>
+#include <linux/netdevice.h>
 
 #include <net/tcp.h>
 #include <net/strparser.h>
···
 
 	struct scatterlist sg_tx_data[MAX_SKB_FRAGS];
 	void (*sk_destruct)(struct sock *sk);
-	u8 driver_state[];
+	u8 driver_state[] __aligned(8);
 	/* The TLS layer reserves room for driver specific state
 	 * Currently the belief is that there is not enough
 	 * driver specific state to justify another layer of indirection
 	 */
-#define TLS_DRIVER_STATE_SIZE (max_t(size_t, 8, sizeof(void *)))
+#define TLS_DRIVER_STATE_SIZE_TX	16
 };
 
 #define TLS_OFFLOAD_CONTEXT_SIZE_TX                                            \
-	(ALIGN(sizeof(struct tls_offload_context_tx), sizeof(void *)) +        \
-	 TLS_DRIVER_STATE_SIZE)
+	(sizeof(struct tls_offload_context_tx) + TLS_DRIVER_STATE_SIZE_TX)
 
 struct cipher_context {
 	char *iv;
···
 	/* sw must be the first member of tls_offload_context_rx */
 	struct tls_sw_context_rx sw;
 	atomic64_t resync_req;
-	u8 driver_state[];
+	u8 driver_state[] __aligned(8);
 	/* The TLS layer reserves room for driver specific state
 	 * Currently the belief is that there is not enough
 	 * driver specific state to justify another layer of indirection
 	 */
+#define TLS_DRIVER_STATE_SIZE_RX	8
 };
 
 #define TLS_OFFLOAD_CONTEXT_SIZE_RX					\
-	(ALIGN(sizeof(struct tls_offload_context_rx), sizeof(void *)) + \
-	 TLS_DRIVER_STATE_SIZE)
+	(sizeof(struct tls_offload_context_rx) + TLS_DRIVER_STATE_SIZE_RX)
 
 int wait_on_pending_writer(struct sock *sk, long *timeo);
 int tls_sk_query(struct sock *sk, int optname, char __user *optval,
···
 	return (struct tls_offload_context_rx *)tls_ctx->priv_ctx_rx;
 }
 
+#if IS_ENABLED(CONFIG_TLS_DEVICE)
+static inline void *__tls_driver_ctx(struct tls_context *tls_ctx,
+				     enum tls_offload_ctx_dir direction)
+{
+	if (direction == TLS_OFFLOAD_CTX_DIR_TX)
+		return tls_offload_ctx_tx(tls_ctx)->driver_state;
+	else
+		return tls_offload_ctx_rx(tls_ctx)->driver_state;
+}
+
+static inline void *
+tls_driver_ctx(const struct sock *sk, enum tls_offload_ctx_dir direction)
+{
+	return __tls_driver_ctx(tls_get_ctx(sk), direction);
+}
+#endif
+
 /* The TLS context is valid until sk_destruct is called */
 static inline void tls_offload_rx_resync_request(struct sock *sk, __be32 seq)
 {
···
 int tls_device_decrypted(struct sock *sk, struct sk_buff *skb);
 int decrypt_skb(struct sock *sk, struct sk_buff *skb,
 		struct scatterlist *sgout);
+struct sk_buff *tls_encrypt_skb(struct sk_buff *skb);
 
 struct sk_buff *tls_validate_xmit_skb(struct sock *sk,
 				      struct net_device *dev,

net/tls/tls_device_fallback.c

···
 }
 EXPORT_SYMBOL_GPL(tls_validate_xmit_skb);
 
+struct sk_buff *tls_encrypt_skb(struct sk_buff *skb)
+{
+	return tls_sw_fallback(skb->sk, skb);
+}
+EXPORT_SYMBOL_GPL(tls_encrypt_skb);
+
 int tls_sw_fallback_init(struct sock *sk,
 			 struct tls_offload_context_tx *offload_ctx,
 			 struct tls_crypto_info *crypto_info)