// 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 64 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 64
#define NFP_CCM_TIMEOUT (NFP_NET_POLL_TIMEOUT * 1000)
#define NFP_CCM_MAX_QLEN 1024
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_cmsg_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)
* @posted: the message was posted and nobody waits for the reply
*/
struct nfp_ccm_mbox_cmsg_cb {
enum nfp_net_mbox_cmsg_state state;
int err;
unsigned int max_len;
unsigned int exp_reply;
bool posted;
};
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;
cb->posted = false;
}
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_posted(struct sk_buff *skb)
{
struct nfp_ccm_mbox_cmsg_cb *cb = (void *)skb->cb;
return cb->posted;
}
static void nfp_ccm_mbox_mark_posted(struct sk_buff *skb)
{
struct nfp_ccm_mbox_cmsg_cb *cb = (void *)skb->cb;
cb->posted = true;
}
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;
if (cb->posted)
queue_work(nn->mbox_cmsg.workq, &nn->mbox_cmsg.runq_work);
}
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;
u32 tlv_hdr;
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 (!cb->posted) {
__be32 *skb_data;
int i, cnt;
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;
if (cb->posted) {
if (cb->err)
nn_dp_warn(&nn->dp,
"mailbox posted msg failed type:%u err:%d\n",
nfp_ccm_get_type(skb), cb->err);
dev_consume_skb_any(skb);
}
} 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 the 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, bool critical)
{
struct nfp_ccm_hdr *hdr;
assert_spin_locked(&nn->mbox_cmsg.queue.lock);
if (!critical && 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, bool critical)
{
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, critical);
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;
}
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)
{
return __nfp_ccm_mbox_communicate(nn, skb, type, reply_size,
max_reply_size, false);
}
static void nfp_ccm_mbox_post_runq_work(struct work_struct *work)
{
struct sk_buff *skb;
struct nfp_net *nn;
nn = container_of(work, struct nfp_net, mbox_cmsg.runq_work);
spin_lock_bh(&nn->mbox_cmsg.queue.lock);
skb = __skb_peek(&nn->mbox_cmsg.queue);
if (WARN_ON(!skb || !nfp_ccm_mbox_is_posted(skb) ||
!nfp_ccm_mbox_should_run(nn, skb))) {
spin_unlock_bh(&nn->mbox_cmsg.queue.lock);
return;
}
nfp_ccm_mbox_run_queue_unlock(nn);
}
static void nfp_ccm_mbox_post_wait_work(struct work_struct *work)
{
struct sk_buff *skb;
struct nfp_net *nn;
int err;
nn = container_of(work, struct nfp_net, mbox_cmsg.wait_work);
skb = skb_peek(&nn->mbox_cmsg.queue);
if (WARN_ON(!skb || !nfp_ccm_mbox_is_posted(skb)))
/* Should never happen so it's unclear what to do here.. */
goto exit_unlock_wake;
err = nfp_net_mbox_reconfig_wait_posted(nn);
if (!err)
nfp_ccm_mbox_copy_out(nn, skb);
else
nfp_ccm_mbox_mark_all_err(nn, skb, -EIO);
exit_unlock_wake:
nn_ctrl_bar_unlock(nn);
wake_up_all(&nn->mbox_cmsg.wq);
}
int nfp_ccm_mbox_post(struct nfp_net *nn, struct sk_buff *skb,
enum nfp_ccm_type type, unsigned int max_reply_size)
{
int err;
err = nfp_ccm_mbox_msg_prepare(nn, skb, type, 0, max_reply_size,
GFP_ATOMIC);
if (err)
goto err_free_skb;
nfp_ccm_mbox_mark_posted(skb);
spin_lock_bh(&nn->mbox_cmsg.queue.lock);
err = nfp_ccm_mbox_msg_enqueue(nn, skb, type, false);
if (err)
goto err_unlock;
if (nfp_ccm_mbox_is_first(nn, skb)) {
if (nn_ctrl_bar_trylock(nn)) {
nfp_ccm_mbox_copy_in(nn, skb);
nfp_net_mbox_reconfig_post(nn,
NFP_NET_CFG_MBOX_CMD_TLV_CMSG);
queue_work(nn->mbox_cmsg.workq,
&nn->mbox_cmsg.wait_work);
} else {
nfp_ccm_mbox_mark_next_runner(nn);
}
}
spin_unlock_bh(&nn->mbox_cmsg.queue.lock);
return 0;
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_msg_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;
}
int nfp_ccm_mbox_init(struct nfp_net *nn)
{
return 0;
}
void nfp_ccm_mbox_clean(struct nfp_net *nn)
{
drain_workqueue(nn->mbox_cmsg.workq);
}
int nfp_ccm_mbox_alloc(struct nfp_net *nn)
{
skb_queue_head_init(&nn->mbox_cmsg.queue);
init_waitqueue_head(&nn->mbox_cmsg.wq);
INIT_WORK(&nn->mbox_cmsg.wait_work, nfp_ccm_mbox_post_wait_work);
INIT_WORK(&nn->mbox_cmsg.runq_work, nfp_ccm_mbox_post_runq_work);
nn->mbox_cmsg.workq = alloc_workqueue("nfp-ccm-mbox", WQ_UNBOUND, 0);
if (!nn->mbox_cmsg.workq)
return -ENOMEM;
return 0;
}
void nfp_ccm_mbox_free(struct nfp_net *nn)
{
destroy_workqueue(nn->mbox_cmsg.workq);
WARN_ON(!skb_queue_empty(&nn->mbox_cmsg.queue));
}
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