nfpcore/nfp_resource.o \
nfpcore/nfp_rtsym.o \
nfpcore/nfp_target.o \
+ ccm.o \
nfp_asm.o \
nfp_app.o \
nfp_app_nic.o \
#include <linux/bug.h>
#include <linux/jiffies.h>
#include <linux/skbuff.h>
-#include <linux/wait.h>
+#include "../ccm.h"
#include "../nfp_app.h"
#include "../nfp_net.h"
#include "fw.h"
#include "main.h"
-#define NFP_BPF_TAG_ALLOC_SPAN (U16_MAX / 4)
-
-static bool nfp_bpf_all_tags_busy(struct nfp_app_bpf *bpf)
-{
- u16 used_tags;
-
- used_tags = bpf->tag_alloc_next - bpf->tag_alloc_last;
-
- return used_tags > NFP_BPF_TAG_ALLOC_SPAN;
-}
-
-static int nfp_bpf_alloc_tag(struct nfp_app_bpf *bpf)
-{
- /* All FW communication for BPF is request-reply. To make sure we
- * don't reuse the message ID too early after timeout - limit the
- * number of requests in flight.
- */
- if (nfp_bpf_all_tags_busy(bpf)) {
- cmsg_warn(bpf, "all FW request contexts busy!\n");
- return -EAGAIN;
- }
-
- WARN_ON(__test_and_set_bit(bpf->tag_alloc_next, bpf->tag_allocator));
- return bpf->tag_alloc_next++;
-}
-
-static void nfp_bpf_free_tag(struct nfp_app_bpf *bpf, u16 tag)
-{
- WARN_ON(!__test_and_clear_bit(tag, bpf->tag_allocator));
-
- while (!test_bit(bpf->tag_alloc_last, bpf->tag_allocator) &&
- bpf->tag_alloc_last != bpf->tag_alloc_next)
- bpf->tag_alloc_last++;
-}
-
static struct sk_buff *
nfp_bpf_cmsg_alloc(struct nfp_app_bpf *bpf, unsigned int size)
{
return size;
}
-static u8 nfp_bpf_cmsg_get_type(struct sk_buff *skb)
-{
- struct cmsg_hdr *hdr;
-
- hdr = (struct cmsg_hdr *)skb->data;
-
- return hdr->type;
-}
-
-static unsigned int nfp_bpf_cmsg_get_tag(struct sk_buff *skb)
-{
- struct cmsg_hdr *hdr;
-
- hdr = (struct cmsg_hdr *)skb->data;
-
- return be16_to_cpu(hdr->tag);
-}
-
-static struct sk_buff *__nfp_bpf_reply(struct nfp_app_bpf *bpf, u16 tag)
-{
- unsigned int msg_tag;
- struct sk_buff *skb;
-
- skb_queue_walk(&bpf->cmsg_replies, skb) {
- msg_tag = nfp_bpf_cmsg_get_tag(skb);
- if (msg_tag == tag) {
- nfp_bpf_free_tag(bpf, tag);
- __skb_unlink(skb, &bpf->cmsg_replies);
- return skb;
- }
- }
-
- return NULL;
-}
-
-static struct sk_buff *nfp_bpf_reply(struct nfp_app_bpf *bpf, u16 tag)
-{
- struct sk_buff *skb;
-
- nfp_ctrl_lock(bpf->app->ctrl);
- skb = __nfp_bpf_reply(bpf, tag);
- nfp_ctrl_unlock(bpf->app->ctrl);
-
- return skb;
-}
-
-static struct sk_buff *nfp_bpf_reply_drop_tag(struct nfp_app_bpf *bpf, u16 tag)
-{
- struct sk_buff *skb;
-
- nfp_ctrl_lock(bpf->app->ctrl);
- skb = __nfp_bpf_reply(bpf, tag);
- if (!skb)
- nfp_bpf_free_tag(bpf, tag);
- nfp_ctrl_unlock(bpf->app->ctrl);
-
- return skb;
-}
-
-static struct sk_buff *
-nfp_bpf_cmsg_wait_reply(struct nfp_app_bpf *bpf, enum nfp_bpf_cmsg_type type,
- int tag)
-{
- struct sk_buff *skb;
- int i, err;
-
- for (i = 0; i < 50; i++) {
- udelay(4);
- skb = nfp_bpf_reply(bpf, tag);
- if (skb)
- return skb;
- }
-
- err = wait_event_interruptible_timeout(bpf->cmsg_wq,
- skb = nfp_bpf_reply(bpf, tag),
- msecs_to_jiffies(5000));
- /* We didn't get a response - try last time and atomically drop
- * the tag even if no response is matched.
- */
- if (!skb)
- skb = nfp_bpf_reply_drop_tag(bpf, tag);
- if (err < 0) {
- cmsg_warn(bpf, "%s waiting for response to 0x%02x: %d\n",
- err == ERESTARTSYS ? "interrupted" : "error",
- type, err);
- return ERR_PTR(err);
- }
- if (!skb) {
- cmsg_warn(bpf, "timeout waiting for response to 0x%02x\n",
- type);
- return ERR_PTR(-ETIMEDOUT);
- }
-
- return skb;
-}
-
-static struct sk_buff *
-nfp_bpf_cmsg_communicate(struct nfp_app_bpf *bpf, struct sk_buff *skb,
- enum nfp_bpf_cmsg_type type, unsigned int reply_size)
-{
- struct cmsg_hdr *hdr;
- int tag;
-
- nfp_ctrl_lock(bpf->app->ctrl);
- tag = nfp_bpf_alloc_tag(bpf);
- if (tag < 0) {
- nfp_ctrl_unlock(bpf->app->ctrl);
- dev_kfree_skb_any(skb);
- return ERR_PTR(tag);
- }
-
- hdr = (void *)skb->data;
- hdr->ver = CMSG_MAP_ABI_VERSION;
- hdr->type = type;
- hdr->tag = cpu_to_be16(tag);
-
- __nfp_app_ctrl_tx(bpf->app, skb);
-
- nfp_ctrl_unlock(bpf->app->ctrl);
-
- skb = nfp_bpf_cmsg_wait_reply(bpf, type, tag);
- if (IS_ERR(skb))
- return skb;
-
- hdr = (struct cmsg_hdr *)skb->data;
- if (hdr->type != __CMSG_REPLY(type)) {
- cmsg_warn(bpf, "cmsg drop - wrong type 0x%02x != 0x%02lx!\n",
- hdr->type, __CMSG_REPLY(type));
- goto err_free;
- }
- /* 0 reply_size means caller will do the validation */
- if (reply_size && skb->len != reply_size) {
- cmsg_warn(bpf, "cmsg drop - type 0x%02x wrong size %d != %d!\n",
- type, skb->len, reply_size);
- goto err_free;
- }
-
- return skb;
-err_free:
- dev_kfree_skb_any(skb);
- return ERR_PTR(-EIO);
-}
-
static int
nfp_bpf_ctrl_rc_to_errno(struct nfp_app_bpf *bpf,
struct cmsg_reply_map_simple *reply)
req->map_type = cpu_to_be32(map->map_type);
req->map_flags = 0;
- skb = nfp_bpf_cmsg_communicate(bpf, skb, CMSG_TYPE_MAP_ALLOC,
- sizeof(*reply));
+ skb = nfp_ccm_communicate(&bpf->ccm, skb, NFP_CCM_TYPE_BPF_MAP_ALLOC,
+ sizeof(*reply));
if (IS_ERR(skb))
return PTR_ERR(skb);
req = (void *)skb->data;
req->tid = cpu_to_be32(nfp_map->tid);
- skb = nfp_bpf_cmsg_communicate(bpf, skb, CMSG_TYPE_MAP_FREE,
- sizeof(*reply));
+ skb = nfp_ccm_communicate(&bpf->ccm, skb, NFP_CCM_TYPE_BPF_MAP_FREE,
+ sizeof(*reply));
if (IS_ERR(skb)) {
cmsg_warn(bpf, "leaking map - I/O error\n");
return;
}
static int
-nfp_bpf_ctrl_entry_op(struct bpf_offloaded_map *offmap,
- enum nfp_bpf_cmsg_type op,
+nfp_bpf_ctrl_entry_op(struct bpf_offloaded_map *offmap, enum nfp_ccm_type op,
u8 *key, u8 *value, u64 flags, u8 *out_key, u8 *out_value)
{
struct nfp_bpf_map *nfp_map = offmap->dev_priv;
memcpy(nfp_bpf_ctrl_req_val(bpf, req, 0), value,
map->value_size);
- skb = nfp_bpf_cmsg_communicate(bpf, skb, op,
- nfp_bpf_cmsg_map_reply_size(bpf, 1));
+ skb = nfp_ccm_communicate(&bpf->ccm, skb, op,
+ nfp_bpf_cmsg_map_reply_size(bpf, 1));
if (IS_ERR(skb))
return PTR_ERR(skb);
int nfp_bpf_ctrl_update_entry(struct bpf_offloaded_map *offmap,
void *key, void *value, u64 flags)
{
- return nfp_bpf_ctrl_entry_op(offmap, CMSG_TYPE_MAP_UPDATE,
+ return nfp_bpf_ctrl_entry_op(offmap, NFP_CCM_TYPE_BPF_MAP_UPDATE,
key, value, flags, NULL, NULL);
}
int nfp_bpf_ctrl_del_entry(struct bpf_offloaded_map *offmap, void *key)
{
- return nfp_bpf_ctrl_entry_op(offmap, CMSG_TYPE_MAP_DELETE,
+ return nfp_bpf_ctrl_entry_op(offmap, NFP_CCM_TYPE_BPF_MAP_DELETE,
key, NULL, 0, NULL, NULL);
}
int nfp_bpf_ctrl_lookup_entry(struct bpf_offloaded_map *offmap,
void *key, void *value)
{
- return nfp_bpf_ctrl_entry_op(offmap, CMSG_TYPE_MAP_LOOKUP,
+ return nfp_bpf_ctrl_entry_op(offmap, NFP_CCM_TYPE_BPF_MAP_LOOKUP,
key, NULL, 0, NULL, value);
}
int nfp_bpf_ctrl_getfirst_entry(struct bpf_offloaded_map *offmap,
void *next_key)
{
- return nfp_bpf_ctrl_entry_op(offmap, CMSG_TYPE_MAP_GETFIRST,
+ return nfp_bpf_ctrl_entry_op(offmap, NFP_CCM_TYPE_BPF_MAP_GETFIRST,
NULL, NULL, 0, next_key, NULL);
}
int nfp_bpf_ctrl_getnext_entry(struct bpf_offloaded_map *offmap,
void *key, void *next_key)
{
- return nfp_bpf_ctrl_entry_op(offmap, CMSG_TYPE_MAP_GETNEXT,
+ return nfp_bpf_ctrl_entry_op(offmap, NFP_CCM_TYPE_BPF_MAP_GETNEXT,
key, NULL, 0, next_key, NULL);
}
void nfp_bpf_ctrl_msg_rx(struct nfp_app *app, struct sk_buff *skb)
{
struct nfp_app_bpf *bpf = app->priv;
- unsigned int tag;
if (unlikely(skb->len < sizeof(struct cmsg_reply_map_simple))) {
cmsg_warn(bpf, "cmsg drop - too short %d!\n", skb->len);
- goto err_free;
+ dev_kfree_skb_any(skb);
+ return;
}
- if (nfp_bpf_cmsg_get_type(skb) == CMSG_TYPE_BPF_EVENT) {
+ if (nfp_ccm_get_type(skb) == NFP_CCM_TYPE_BPF_BPF_EVENT) {
if (!nfp_bpf_event_output(bpf, skb->data, skb->len))
dev_consume_skb_any(skb);
else
dev_kfree_skb_any(skb);
- return;
}
- nfp_ctrl_lock(bpf->app->ctrl);
-
- tag = nfp_bpf_cmsg_get_tag(skb);
- if (unlikely(!test_bit(tag, bpf->tag_allocator))) {
- cmsg_warn(bpf, "cmsg drop - no one is waiting for tag %u!\n",
- tag);
- goto err_unlock;
- }
-
- __skb_queue_tail(&bpf->cmsg_replies, skb);
- wake_up_interruptible_all(&bpf->cmsg_wq);
-
- nfp_ctrl_unlock(bpf->app->ctrl);
-
- return;
-err_unlock:
- nfp_ctrl_unlock(bpf->app->ctrl);
-err_free:
- dev_kfree_skb_any(skb);
+ nfp_ccm_rx(&bpf->ccm, skb);
}
void
nfp_bpf_ctrl_msg_rx_raw(struct nfp_app *app, const void *data, unsigned int len)
{
+ const struct nfp_ccm_hdr *hdr = data;
struct nfp_app_bpf *bpf = app->priv;
- const struct cmsg_hdr *hdr = data;
if (unlikely(len < sizeof(struct cmsg_reply_map_simple))) {
cmsg_warn(bpf, "cmsg drop - too short %d!\n", len);
return;
}
- if (hdr->type == CMSG_TYPE_BPF_EVENT)
+ if (hdr->type == NFP_CCM_TYPE_BPF_BPF_EVENT)
nfp_bpf_event_output(bpf, data, len);
else
cmsg_warn(bpf, "cmsg drop - msg type %d with raw buffer!\n",
#include <linux/bitops.h>
#include <linux/types.h>
+#include "../ccm.h"
/* Kernel's enum bpf_reg_type is not uABI so people may change it breaking
* our FW ABI. In that case we will do translation in the driver.
/*
* Types defined for map related control messages
*/
-#define CMSG_MAP_ABI_VERSION 1
-
-enum nfp_bpf_cmsg_type {
- CMSG_TYPE_MAP_ALLOC = 1,
- CMSG_TYPE_MAP_FREE = 2,
- CMSG_TYPE_MAP_LOOKUP = 3,
- CMSG_TYPE_MAP_UPDATE = 4,
- CMSG_TYPE_MAP_DELETE = 5,
- CMSG_TYPE_MAP_GETNEXT = 6,
- CMSG_TYPE_MAP_GETFIRST = 7,
- CMSG_TYPE_BPF_EVENT = 8,
- __CMSG_TYPE_MAP_MAX,
-};
-
-#define CMSG_TYPE_MAP_REPLY_BIT 7
-#define __CMSG_REPLY(req) (BIT(CMSG_TYPE_MAP_REPLY_BIT) | (req))
/* BPF ABIv2 fixed-length control message fields */
#define CMSG_MAP_KEY_LW 16
CMSG_RC_ERR_MAP_E2BIG = 7,
};
-struct cmsg_hdr {
- u8 type;
- u8 ver;
- __be16 tag;
-};
-
struct cmsg_reply_map_simple {
- struct cmsg_hdr hdr;
+ struct nfp_ccm_hdr hdr;
__be32 rc;
};
struct cmsg_req_map_alloc_tbl {
- struct cmsg_hdr hdr;
+ struct nfp_ccm_hdr hdr;
__be32 key_size; /* in bytes */
__be32 value_size; /* in bytes */
__be32 max_entries;
};
struct cmsg_req_map_free_tbl {
- struct cmsg_hdr hdr;
+ struct nfp_ccm_hdr hdr;
__be32 tid;
};
};
struct cmsg_req_map_op {
- struct cmsg_hdr hdr;
+ struct nfp_ccm_hdr hdr;
__be32 tid;
__be32 count;
__be32 flags;
};
struct cmsg_bpf_event {
- struct cmsg_hdr hdr;
+ struct nfp_ccm_hdr hdr;
__be32 cpu_id;
__be64 map_ptr;
__be32 data_size;
bpf->app = app;
app->priv = bpf;
- skb_queue_head_init(&bpf->cmsg_replies);
- init_waitqueue_head(&bpf->cmsg_wq);
INIT_LIST_HEAD(&bpf->map_list);
- err = rhashtable_init(&bpf->maps_neutral, &nfp_bpf_maps_neutral_params);
+ err = nfp_ccm_init(&bpf->ccm, app);
if (err)
goto err_free_bpf;
+ err = rhashtable_init(&bpf->maps_neutral, &nfp_bpf_maps_neutral_params);
+ if (err)
+ goto err_clean_ccm;
+
nfp_bpf_init_capabilities(bpf);
err = nfp_bpf_parse_capabilities(app);
err_free_neutral_maps:
rhashtable_destroy(&bpf->maps_neutral);
+err_clean_ccm:
+ nfp_ccm_clean(&bpf->ccm);
err_free_bpf:
kfree(bpf);
return err;
struct nfp_app_bpf *bpf = app->priv;
bpf_offload_dev_destroy(bpf->bpf_dev);
- WARN_ON(!skb_queue_empty(&bpf->cmsg_replies));
+ nfp_ccm_clean(&bpf->ccm);
WARN_ON(!list_empty(&bpf->map_list));
WARN_ON(bpf->maps_in_use || bpf->map_elems_in_use);
rhashtable_free_and_destroy(&bpf->maps_neutral,
#include <linux/types.h>
#include <linux/wait.h>
+#include "../ccm.h"
#include "../nfp_asm.h"
#include "fw.h"
/**
* struct nfp_app_bpf - bpf app priv structure
* @app: backpointer to the app
+ * @ccm: common control message handler data
*
* @bpf_dev: BPF offload device handle
*
- * @tag_allocator: bitmap of control message tags in use
- * @tag_alloc_next: next tag bit to allocate
- * @tag_alloc_last: next tag bit to be freed
- *
- * @cmsg_replies: received cmsg replies waiting to be consumed
- * @cmsg_wq: work queue for waiting for cmsg replies
- *
* @cmsg_key_sz: size of key in cmsg element array
* @cmsg_val_sz: size of value in cmsg element array
*
*/
struct nfp_app_bpf {
struct nfp_app *app;
+ struct nfp_ccm ccm;
struct bpf_offload_dev *bpf_dev;
- DECLARE_BITMAP(tag_allocator, U16_MAX + 1);
- u16 tag_alloc_next;
- u16 tag_alloc_last;
-
- struct sk_buff_head cmsg_replies;
- struct wait_queue_head cmsg_wq;
-
unsigned int cmsg_key_sz;
unsigned int cmsg_val_sz;
#include <net/tc_act/tc_mirred.h>
#include "main.h"
+#include "../ccm.h"
#include "../nfp_app.h"
#include "../nfp_net_ctrl.h"
#include "../nfp_net.h"
if (len < sizeof(struct cmsg_bpf_event) + pkt_size + data_size)
return -EINVAL;
- if (cbe->hdr.ver != CMSG_MAP_ABI_VERSION)
+ if (cbe->hdr.ver != NFP_CCM_ABI_VERSION)
return -EINVAL;
rcu_read_lock();
--- /dev/null
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/* Copyright (C) 2016-2019 Netronome Systems, Inc. */
+
+#include <linux/bitops.h>
+
+#include "ccm.h"
+#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)
+
+static bool nfp_ccm_all_tags_busy(struct nfp_ccm *ccm)
+{
+ u16 used_tags;
+
+ used_tags = ccm->tag_alloc_next - ccm->tag_alloc_last;
+
+ return used_tags > NFP_CCM_TAG_ALLOC_SPAN;
+}
+
+static int nfp_ccm_alloc_tag(struct nfp_ccm *ccm)
+{
+ /* CCM is for FW communication which is request-reply. To make sure
+ * we don't reuse the message ID too early after timeout - limit the
+ * number of requests in flight.
+ */
+ if (unlikely(nfp_ccm_all_tags_busy(ccm))) {
+ ccm_warn(ccm->app, "all FW request contexts busy!\n");
+ return -EAGAIN;
+ }
+
+ WARN_ON(__test_and_set_bit(ccm->tag_alloc_next, ccm->tag_allocator));
+ return ccm->tag_alloc_next++;
+}
+
+static void nfp_ccm_free_tag(struct nfp_ccm *ccm, u16 tag)
+{
+ WARN_ON(!__test_and_clear_bit(tag, ccm->tag_allocator));
+
+ while (!test_bit(ccm->tag_alloc_last, ccm->tag_allocator) &&
+ ccm->tag_alloc_last != ccm->tag_alloc_next)
+ ccm->tag_alloc_last++;
+}
+
+static struct sk_buff *__nfp_ccm_reply(struct nfp_ccm *ccm, u16 tag)
+{
+ unsigned int msg_tag;
+ struct sk_buff *skb;
+
+ skb_queue_walk(&ccm->replies, skb) {
+ msg_tag = nfp_ccm_get_tag(skb);
+ if (msg_tag == tag) {
+ nfp_ccm_free_tag(ccm, tag);
+ __skb_unlink(skb, &ccm->replies);
+ return skb;
+ }
+ }
+
+ return NULL;
+}
+
+static struct sk_buff *
+nfp_ccm_reply(struct nfp_ccm *ccm, struct nfp_app *app, u16 tag)
+{
+ struct sk_buff *skb;
+
+ nfp_ctrl_lock(app->ctrl);
+ skb = __nfp_ccm_reply(ccm, tag);
+ nfp_ctrl_unlock(app->ctrl);
+
+ return skb;
+}
+
+static struct sk_buff *
+nfp_ccm_reply_drop_tag(struct nfp_ccm *ccm, struct nfp_app *app, u16 tag)
+{
+ struct sk_buff *skb;
+
+ nfp_ctrl_lock(app->ctrl);
+ skb = __nfp_ccm_reply(ccm, tag);
+ if (!skb)
+ nfp_ccm_free_tag(ccm, tag);
+ nfp_ctrl_unlock(app->ctrl);
+
+ return skb;
+}
+
+static struct sk_buff *
+nfp_ccm_wait_reply(struct nfp_ccm *ccm, struct nfp_app *app,
+ enum nfp_ccm_type type, int tag)
+{
+ struct sk_buff *skb;
+ int i, err;
+
+ for (i = 0; i < 50; i++) {
+ udelay(4);
+ skb = nfp_ccm_reply(ccm, app, tag);
+ if (skb)
+ return skb;
+ }
+
+ err = wait_event_interruptible_timeout(ccm->wq,
+ skb = nfp_ccm_reply(ccm, app,
+ tag),
+ msecs_to_jiffies(5000));
+ /* We didn't get a response - try last time and atomically drop
+ * the tag even if no response is matched.
+ */
+ if (!skb)
+ skb = nfp_ccm_reply_drop_tag(ccm, app, tag);
+ if (err < 0) {
+ ccm_warn(app, "%s waiting for response to 0x%02x: %d\n",
+ err == ERESTARTSYS ? "interrupted" : "error",
+ type, err);
+ return ERR_PTR(err);
+ }
+ if (!skb) {
+ ccm_warn(app, "timeout waiting for response to 0x%02x\n", type);
+ return ERR_PTR(-ETIMEDOUT);
+ }
+
+ return skb;
+}
+
+struct sk_buff *
+nfp_ccm_communicate(struct nfp_ccm *ccm, struct sk_buff *skb,
+ enum nfp_ccm_type type, unsigned int reply_size)
+{
+ struct nfp_app *app = ccm->app;
+ struct nfp_ccm_hdr *hdr;
+ int reply_type, tag;
+
+ nfp_ctrl_lock(app->ctrl);
+ tag = nfp_ccm_alloc_tag(ccm);
+ if (tag < 0) {
+ nfp_ctrl_unlock(app->ctrl);
+ dev_kfree_skb_any(skb);
+ return ERR_PTR(tag);
+ }
+
+ hdr = (void *)skb->data;
+ hdr->ver = NFP_CCM_ABI_VERSION;
+ hdr->type = type;
+ hdr->tag = cpu_to_be16(tag);
+
+ __nfp_app_ctrl_tx(app, skb);
+
+ nfp_ctrl_unlock(app->ctrl);
+
+ skb = nfp_ccm_wait_reply(ccm, app, type, tag);
+ if (IS_ERR(skb))
+ return skb;
+
+ reply_type = nfp_ccm_get_type(skb);
+ if (reply_type != __NFP_CCM_REPLY(type)) {
+ ccm_warn(app, "cmsg drop - wrong type 0x%02x != 0x%02lx!\n",
+ reply_type, __NFP_CCM_REPLY(type));
+ goto err_free;
+ }
+ /* 0 reply_size means caller will do the validation */
+ if (reply_size && skb->len != reply_size) {
+ ccm_warn(app, "cmsg drop - type 0x%02x wrong size %d != %d!\n",
+ type, skb->len, reply_size);
+ goto err_free;
+ }
+
+ return skb;
+err_free:
+ dev_kfree_skb_any(skb);
+ return ERR_PTR(-EIO);
+}
+
+void nfp_ccm_rx(struct nfp_ccm *ccm, struct sk_buff *skb)
+{
+ struct nfp_app *app = ccm->app;
+ unsigned int tag;
+
+ if (unlikely(skb->len < sizeof(struct nfp_ccm_hdr))) {
+ ccm_warn(app, "cmsg drop - too short %d!\n", skb->len);
+ goto err_free;
+ }
+
+ nfp_ctrl_lock(app->ctrl);
+
+ tag = nfp_ccm_get_tag(skb);
+ if (unlikely(!test_bit(tag, ccm->tag_allocator))) {
+ ccm_warn(app, "cmsg drop - no one is waiting for tag %u!\n",
+ tag);
+ goto err_unlock;
+ }
+
+ __skb_queue_tail(&ccm->replies, skb);
+ wake_up_interruptible_all(&ccm->wq);
+
+ nfp_ctrl_unlock(app->ctrl);
+ return;
+
+err_unlock:
+ nfp_ctrl_unlock(app->ctrl);
+err_free:
+ dev_kfree_skb_any(skb);
+}
+
+int nfp_ccm_init(struct nfp_ccm *ccm, struct nfp_app *app)
+{
+ ccm->app = app;
+ skb_queue_head_init(&ccm->replies);
+ init_waitqueue_head(&ccm->wq);
+ return 0;
+}
+
+void nfp_ccm_clean(struct nfp_ccm *ccm)
+{
+ WARN_ON(!skb_queue_empty(&ccm->replies));
+}
--- /dev/null
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+/* Copyright (C) 2016-2019 Netronome Systems, Inc. */
+
+#ifndef NFP_CCM_H
+#define NFP_CCM_H 1
+
+#include <linux/bitmap.h>
+#include <linux/skbuff.h>
+#include <linux/wait.h>
+
+struct nfp_app;
+
+/* Firmware ABI */
+
+enum nfp_ccm_type {
+ NFP_CCM_TYPE_BPF_MAP_ALLOC = 1,
+ NFP_CCM_TYPE_BPF_MAP_FREE = 2,
+ NFP_CCM_TYPE_BPF_MAP_LOOKUP = 3,
+ NFP_CCM_TYPE_BPF_MAP_UPDATE = 4,
+ NFP_CCM_TYPE_BPF_MAP_DELETE = 5,
+ NFP_CCM_TYPE_BPF_MAP_GETNEXT = 6,
+ NFP_CCM_TYPE_BPF_MAP_GETFIRST = 7,
+ NFP_CCM_TYPE_BPF_BPF_EVENT = 8,
+ __NFP_CCM_TYPE_MAX,
+};
+
+#define NFP_CCM_ABI_VERSION 1
+
+struct nfp_ccm_hdr {
+ u8 type;
+ u8 ver;
+ __be16 tag;
+};
+
+static inline u8 nfp_ccm_get_type(struct sk_buff *skb)
+{
+ struct nfp_ccm_hdr *hdr;
+
+ hdr = (struct nfp_ccm_hdr *)skb->data;
+
+ return hdr->type;
+}
+
+static inline unsigned int 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);
+}
+
+/* Implementation */
+
+/**
+ * struct nfp_ccm - common control message handling
+ * @tag_allocator: bitmap of control message tags in use
+ * @tag_alloc_next: next tag bit to allocate
+ * @tag_alloc_last: next tag bit to be freed
+ *
+ * @replies: received cmsg replies waiting to be consumed
+ * @wq: work queue for waiting for cmsg replies
+ */
+struct nfp_ccm {
+ struct nfp_app *app;
+
+ DECLARE_BITMAP(tag_allocator, U16_MAX + 1);
+ u16 tag_alloc_next;
+ u16 tag_alloc_last;
+
+ struct sk_buff_head replies;
+ struct wait_queue_head wq;
+};
+
+int nfp_ccm_init(struct nfp_ccm *ccm, struct nfp_app *app);
+void nfp_ccm_clean(struct nfp_ccm *ccm);
+void nfp_ccm_rx(struct nfp_ccm *ccm, struct sk_buff *skb);
+struct sk_buff *
+nfp_ccm_communicate(struct nfp_ccm *ccm, struct sk_buff *skb,
+ enum nfp_ccm_type type, unsigned int reply_size);
+#endif
OSDN Git Service
