Function tap_flow_destroy_pmd

dpdk/drivers/net/tap/tap_flow.c:1494–1554

* Destroy a flow using pointer to pmd_internal. * * @param[in, out] pmd * Pointer to private structure. * @param[in] flow * Pointer to the flow to destroy. * @param[in, out] error * Pointer to the flow error handler * * @return 0 if the flow could be destroyed, -1 otherwise. */

 * @return 0 if the flow could be destroyed, -1 otherwise.
 */
static int
tap_flow_destroy_pmd(struct pmd_internals *pmd,
		     struct rte_flow *flow,
		     struct rte_flow_error *error)
{
	struct rte_flow *remote_flow = flow->remote_flow;
	int ret = 0;

	LIST_REMOVE(flow, next);
	flow->msg.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
	flow->msg.nh.nlmsg_type = RTM_DELTFILTER;

	ret = tap_nl_send(pmd->nlsk_fd, &flow->msg.nh);
	if (ret < 0) {
		rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE,
				   NULL, "couldn't send request to kernel");
		goto end;
	}
	ret = tap_nl_recv_ack(pmd->nlsk_fd);
	/* If errno is ENOENT, the rule is already no longer in the kernel. */
	if (ret < 0 && errno == ENOENT)
		ret = 0;
	if (ret < 0) {
		TAP_LOG(ERR,
			"Kernel refused TC filter rule deletion (%d): %s",
			errno, strerror(errno));
		rte_flow_error_set(
			error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, NULL,
			"couldn't receive kernel ack to our request");
		goto end;
	}

	if (remote_flow) {
		remote_flow->msg.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
		remote_flow->msg.nh.nlmsg_type = RTM_DELTFILTER;

		ret = tap_nl_send(pmd->nlsk_fd, &remote_flow->msg.nh);
		if (ret < 0) {
			rte_flow_error_set(
				error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE,
				NULL, "Failure sending nl request");
			goto end;
		}
		ret = tap_nl_recv_ack(pmd->nlsk_fd);
		if (ret < 0 && errno == ENOENT)
			ret = 0;
		if (ret < 0) {
			TAP_LOG(ERR,
				"Kernel refused TC filter rule deletion (%d): %s",
				errno, strerror(errno));
			rte_flow_error_set(
				error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE,
				NULL, "Failure trying to receive nl ack");
			goto end;
		}
	}
end:
	rte_free(remote_flow);