1 files changed, 19 insertions, 217 deletions

diff --git a/drivers/net/ethernet/netronome/nfp/bpf/cmsg.c b/drivers/net/ethernet/netronome/nfp/bpf/cmsg.c
index 9b6cfa697879..bc9850e4ec5e 100644
--- a/drivers/net/ethernet/netronome/nfp/bpf/cmsg.c
+++ b/drivers/net/ethernet/netronome/nfp/bpf/cmsg.c
@@ -6,48 +6,13 @@
 #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)
 {
@@ -87,149 +52,6 @@ nfp_bpf_cmsg_map_reply_size(struct nfp_app_bpf *bpf, unsigned int n)
 	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)
@@ -275,8 +97,8 @@ nfp_bpf_ctrl_alloc_map(struct nfp_app_bpf *bpf, struct bpf_map *map)
 	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);
 
@@ -310,8 +132,8 @@ void nfp_bpf_ctrl_free_map(struct nfp_app_bpf *bpf, struct nfp_bpf_map *nfp_map)
 	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;
@@ -354,8 +176,7 @@ nfp_bpf_ctrl_reply_val(struct nfp_app_bpf *bpf, struct cmsg_reply_map_op *reply,
 }
 
 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;
@@ -386,8 +207,8 @@ nfp_bpf_ctrl_entry_op(struct bpf_offloaded_map *offmap,
 		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);
 
@@ -415,34 +236,34 @@ err_free:
 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);
 }
 
@@ -456,54 +277,35 @@ unsigned int nfp_bpf_ctrl_cmsg_mtu(struct nfp_app_bpf *bpf)
 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",