[nft] src: remove unused batch support checks

diff --git a/include/mnl.h b/include/mnl.h
index d3eedeb732db..91f478342176 100644
--- a/include/mnl.h
+++ b/include/mnl.h
@@ -108,6 +108,4 @@  int mnl_nft_event_listener(struct mnl_socket *nf_sock, unsigned int debug_mask,
 			   int (*cb)(const struct nlmsghdr *nlh, void *data),
 			   void *cb_data);
 
-bool mnl_batch_supported(struct mnl_socket *nf_sock, uint32_t *seqnum);
-
 #endif /* _NFTABLES_MNL_H_ */
diff --git a/include/netlink.h b/include/netlink.h
index 905c9d74300a..240441dde5dd 100644
--- a/include/netlink.h
+++ b/include/netlink.h
@@ -52,7 +52,6 @@  struct netlink_ctx {
 	const void		*data;
 	uint32_t		seqnum;
 	struct nftnl_batch	*batch;
-	bool			batch_supported;
 	unsigned int		debug_mask;
 	struct output_ctx	*octx;
 	struct nft_cache	*cache;
@@ -246,8 +245,6 @@  struct netlink_mon_handler {
 
 extern int netlink_monitor(struct netlink_mon_handler *monhandler,
 			    struct mnl_socket *nf_sock);
-bool netlink_batch_supported(struct mnl_socket *nf_sock, uint32_t *seqnum);
-
 int netlink_echo_callback(const struct nlmsghdr *nlh, void *data);
 
 struct ruleset_parse {
diff --git a/src/libnftables.c b/src/libnftables.c
index 1d1975e99817..9b2f65aed759 100644
--- a/src/libnftables.c
+++ b/src/libnftables.c
@@ -27,7 +27,6 @@  static int nft_netlink(struct nft_ctx *nft,
 	struct cmd *cmd;
 	struct mnl_err *err, *tmp;
 	LIST_HEAD(err_list);
-	bool batch_supported = netlink_batch_supported(nf_sock, &seqnum);
 	int ret = 0;
 
 	if (list_empty(&state->cmds))
@@ -41,7 +40,6 @@  static int nft_netlink(struct nft_ctx *nft,
 		ctx.msgs = msgs;
 		ctx.seqnum = cmd->seqnum = mnl_seqnum_alloc(&seqnum);
 		ctx.batch = batch;
-		ctx.batch_supported = batch_supported;
 		ctx.octx = &nft->output;
 		ctx.nf_sock = nf_sock;
 		ctx.cache = &nft->cache;
diff --git a/src/mnl.c b/src/mnl.c
index 3d48bc1b0930..0bd7e5529a0e 100644
--- a/src/mnl.c
+++ b/src/mnl.c
@@ -1196,67 +1196,3 @@  int mnl_nft_event_listener(struct mnl_socket *nf_sock, unsigned int debug_mask,
 	}
 	return ret;
 }
-
-static void nft_mnl_batch_put(char *buf, uint16_t type, uint32_t seqnum)
-{
-	struct nlmsghdr *nlh;
-	struct nfgenmsg *nfg;
-
-	nlh = mnl_nlmsg_put_header(buf);
-	nlh->nlmsg_type = type;
-	nlh->nlmsg_flags = NLM_F_REQUEST;
-	nlh->nlmsg_seq = seqnum;
-
-	nfg = mnl_nlmsg_put_extra_header(nlh, sizeof(*nfg));
-	nfg->nfgen_family = AF_INET;
-	nfg->version = NFNETLINK_V0;
-	nfg->res_id = NFNL_SUBSYS_NFTABLES;
-}
-
-bool mnl_batch_supported(struct mnl_socket *nf_sock, uint32_t *seqnum)
-{
-	struct mnl_nlmsg_batch *b;
-	char buf[MNL_SOCKET_BUFFER_SIZE];
-	int ret;
-
-	b = mnl_nlmsg_batch_start(buf, sizeof(buf));
-
-	nft_mnl_batch_put(mnl_nlmsg_batch_current(b), NFNL_MSG_BATCH_BEGIN,
-			  mnl_seqnum_alloc(seqnum));
-	mnl_nlmsg_batch_next(b);
-
-	nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(b), NFT_MSG_NEWSET,
-			      AF_INET, NLM_F_ACK, mnl_seqnum_alloc(seqnum));
-	mnl_nlmsg_batch_next(b);
-
-	nft_mnl_batch_put(mnl_nlmsg_batch_current(b), NFNL_MSG_BATCH_END,
-			  mnl_seqnum_alloc(seqnum));
-	mnl_nlmsg_batch_next(b);
-
-	ret = mnl_socket_sendto(nf_sock, mnl_nlmsg_batch_head(b),
-				mnl_nlmsg_batch_size(b));
-	if (ret < 0)
-		goto err;
-
-	mnl_nlmsg_batch_stop(b);
-
-	ret = mnl_socket_recvfrom(nf_sock, buf, sizeof(buf));
-	while (ret > 0) {
-		ret = mnl_cb_run(buf, ret, 0, mnl_socket_get_portid(nf_sock),
-				 NULL, NULL);
-		if (ret <= 0)
-			break;
-
-		ret = mnl_socket_recvfrom(nf_sock, buf, sizeof(buf));
-	}
-
-	/* We're sending an incomplete message to see if the kernel supports
-	 * set messages in batches. EINVAL means that we sent an incomplete
-	 * message with missing attributes. The kernel just ignores messages
-	 * that we cannot include in the batch.
-	 */
-	return (ret == -1 && errno == EINVAL) ? true : false;
-err:
-	mnl_nlmsg_batch_stop(b);
-	return ret;
-}
diff --git a/src/netlink.c b/src/netlink.c
index 46603976ccb6..2422ea114815 100644
--- a/src/netlink.c
+++ b/src/netlink.c
@@ -1749,9 +1749,6 @@  int netlink_flush_ruleset(struct netlink_ctx *ctx, const struct handle *h,
 	struct nftnl_table *nlt;
 	int err;
 
-	if (!ctx->batch_supported)
-		return netlink_io_error(ctx, loc, "Operation not supported");
-
 	nlt = alloc_nftnl_table(h);
 	err = mnl_nft_table_batch_del(nlt, ctx->batch, 0, ctx->seqnum);
 	nftnl_table_free(nlt);
@@ -2344,8 +2341,3 @@  int netlink_markup_parse_cb(const struct nftnl_parse_ctx *ctx)
 
 	return 0;
 }
-
-bool netlink_batch_supported(struct mnl_socket *nf_sock, uint32_t *seqnum)
-{
-	return mnl_batch_supported(nf_sock, seqnum);
-}