drivers/net/ethernet/mellanox/mlx5/core/en/mod_hdr.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/mellanox/mlx5/core/en/mod_hdr.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/mellanox/mlx5/core/en/mod_hdr.c
Extension
.c
Size
5070 bytes
Lines
217
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct mod_hdr_key {
	int num_actions;
	void *actions;
};

struct mlx5e_mod_hdr_handle {
	/* a node of a hash table which keeps all the mod_hdr entries */
	struct hlist_node mod_hdr_hlist;

	struct mod_hdr_key key;

	struct mlx5_modify_hdr *modify_hdr;

	refcount_t refcnt;
	struct completion res_ready;
	int compl_result;
};

static u32 hash_mod_hdr_info(struct mod_hdr_key *key)
{
	return jhash(key->actions,
		     key->num_actions * MLX5_MH_ACT_SZ, 0);
}

static int cmp_mod_hdr_info(struct mod_hdr_key *a, struct mod_hdr_key *b)
{
	if (a->num_actions != b->num_actions)
		return 1;

	return memcmp(a->actions, b->actions,
		      a->num_actions * MLX5_MH_ACT_SZ);
}

void mlx5e_mod_hdr_tbl_init(struct mod_hdr_tbl *tbl)
{
	mutex_init(&tbl->lock);
	hash_init(tbl->hlist);
}

void mlx5e_mod_hdr_tbl_destroy(struct mod_hdr_tbl *tbl)
{
	WARN_ON(!hash_empty(tbl->hlist));
	mutex_destroy(&tbl->lock);
}

static struct mlx5e_mod_hdr_handle *mod_hdr_get(struct mod_hdr_tbl *tbl,
						struct mod_hdr_key *key,
						u32 hash_key)
{
	struct mlx5e_mod_hdr_handle *mh, *found = NULL;

	hash_for_each_possible(tbl->hlist, mh, mod_hdr_hlist, hash_key) {
		if (!cmp_mod_hdr_info(&mh->key, key)) {
			refcount_inc(&mh->refcnt);
			found = mh;
			break;
		}
	}

	return found;
}

struct mlx5e_mod_hdr_handle *
mlx5e_mod_hdr_attach(struct mlx5_core_dev *mdev,
		     struct mod_hdr_tbl *tbl,
		     enum mlx5_flow_namespace_type namespace,
		     struct mlx5e_tc_mod_hdr_acts *mod_hdr_acts)
{
	int num_actions, actions_size, err;
	struct mlx5e_mod_hdr_handle *mh;
	struct mod_hdr_key key;
	u32 hash_key;

	num_actions  = mod_hdr_acts->num_actions;
	actions_size = MLX5_MH_ACT_SZ * num_actions;

	key.actions = mod_hdr_acts->actions;
	key.num_actions = num_actions;

	hash_key = hash_mod_hdr_info(&key);

	mutex_lock(&tbl->lock);
	mh = mod_hdr_get(tbl, &key, hash_key);
	if (mh) {
		mutex_unlock(&tbl->lock);
		wait_for_completion(&mh->res_ready);

		if (mh->compl_result < 0) {
			err = -EREMOTEIO;
			goto attach_header_err;

Annotation

Implementation Notes