Re: [dpdk-dev] [PATCH v3 11/13] net/mlx5: add e-switch VXLAN tunnel devices management

[Yongseok Koh <yskoh@mellanox.com>]

On Thu, Nov 01, 2018 at 05:19:33AM -0700, Slava Ovsiienko wrote:
> VXLAN interfaces are dynamically created for each local UDP port
> of outer networks and then used as targets for TC "flower" filters
> in order to perform encapsulation. These VXLAN interfaces are
> system-wide, the only one device with given UDP port can exist
> in the system (the attempt of creating another device with the
> same UDP local port returns EEXIST), so PMD should support the
> shared device instances database for PMD instances. These VXLAN
> implicitly created devices are called VTEPs (Virtual Tunnel
> End Points).
> 
> Creation of the VTEP occurs at the moment of rule applying. The
> link is set up, root ingress qdisc is also initialized.
> 
> Encapsulation VTEPs are created on per port basis, the single
> VTEP is attached to the outer interface and is shared for all
> encapsulation rules on this interface. The source UDP port is
> automatically selected in range 30000-60000.
> 
> For decapsulaton one VTEP is created per every unique UDP
> local port to accept tunnel traffic. The name of created
> VTEP consists of prefix "vmlx_" and the number of UDP port in
> decimal digits without leading zeros (vmlx_4789). The VTEP
> can be preliminary created in the system before the launching
> application, it allows to share	UDP ports between primary
> and secondary processes.
> 
> Suggested-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
> Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
> ---
Acked-by: Yongseok Koh <yskoh@mellanox.com>

Thanks

>  drivers/net/mlx5/mlx5_flow_tcf.c | 461 ++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 455 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/mlx5/mlx5_flow_tcf.c b/drivers/net/mlx5/mlx5_flow_tcf.c
> index 02b64d6..c6e07f5 100644
> --- a/drivers/net/mlx5/mlx5_flow_tcf.c
> +++ b/drivers/net/mlx5/mlx5_flow_tcf.c
> @@ -3750,6 +3750,417 @@ struct pedit_parser {
>  	return -err;
>  }
>  
> +#define MNL_BUF_EXTRA_SPACE 16
> +#define MNL_REQUEST_SIZE_MIN 256
> +#define MNL_REQUEST_SIZE_MAX 2048
> +#define MNL_REQUEST_SIZE RTE_MIN(RTE_MAX(sysconf(_SC_PAGESIZE), \
> +				 MNL_REQUEST_SIZE_MIN), MNL_REQUEST_SIZE_MAX)
> +
> +/* VTEP device list is shared between PMD port instances. */
> +static LIST_HEAD(, tcf_vtep) vtep_list_vxlan = LIST_HEAD_INITIALIZER();
> +static pthread_mutex_t vtep_list_mutex = PTHREAD_MUTEX_INITIALIZER;
> +
> +/**
> + * Deletes VTEP network device.
> + *
> + * @param[in] tcf
> + *   Context object initialized by mlx5_flow_tcf_context_create().
> + * @param[in] vtep
> + *   Object represinting the network device to delete. Memory
> + *   allocated for this object is freed by routine.
> + */
> +static void
> +flow_tcf_vtep_delete(struct mlx5_flow_tcf_context *tcf,
> +		     struct tcf_vtep *vtep)
> +{
> +	struct nlmsghdr *nlh;
> +	struct ifinfomsg *ifm;
> +	alignas(struct nlmsghdr)
> +	uint8_t buf[mnl_nlmsg_size(MNL_ALIGN(sizeof(*ifm))) +
> +		    MNL_BUF_EXTRA_SPACE];
> +	int ret;
> +
> +	assert(!vtep->refcnt);
> +	/* Delete only ifaces those we actually created. */
> +	if (vtep->created && vtep->ifindex) {
> +		DRV_LOG(INFO, "VTEP delete (%d)", vtep->ifindex);
> +		nlh = mnl_nlmsg_put_header(buf);
> +		nlh->nlmsg_type = RTM_DELLINK;
> +		nlh->nlmsg_flags = NLM_F_REQUEST;
> +		ifm = mnl_nlmsg_put_extra_header(nlh, sizeof(*ifm));
> +		ifm->ifi_family = AF_UNSPEC;
> +		ifm->ifi_index = vtep->ifindex;
> +		assert(sizeof(buf) >= nlh->nlmsg_len);
> +		ret = flow_tcf_nl_ack(tcf, nlh, 0, NULL, NULL);
> +		if (ret)
> +			DRV_LOG(WARNING, "netlink: error deleting vxlan"
> +					 " encap/decap ifindex %u",
> +					 ifm->ifi_index);
> +	}
> +	rte_free(vtep);
> +}
> +
> +/**
> + * Creates VTEP network device.
> + *
> + * @param[in] tcf
> + *   Context object initialized by mlx5_flow_tcf_context_create().
> + * @param[in] ifouter
> + *   Outer interface to attach new-created VXLAN device
> + *   If zero the VXLAN device will not be attached to any device.
> + *   These VTEPs are used for decapsulation and can be precreated
> + *   and shared between processes.
> + * @param[in] port
> + *   UDP port of created VTEP device.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL.
> + *
> + * @return
> + * Pointer to created device structure on success,
> + * NULL otherwise and rte_errno is set.
> + */
> +#ifdef HAVE_IFLA_VXLAN_COLLECT_METADATA
> +static struct tcf_vtep*
> +flow_tcf_vtep_create(struct mlx5_flow_tcf_context *tcf,
> +		     unsigned int ifouter,
> +		     uint16_t port, struct rte_flow_error *error)
> +{
> +	struct tcf_vtep *vtep;
> +	struct nlmsghdr *nlh;
> +	struct ifinfomsg *ifm;
> +	char name[sizeof(MLX5_VXLAN_DEVICE_PFX) + 24];
> +	alignas(struct nlmsghdr)
> +	uint8_t buf[mnl_nlmsg_size(sizeof(*ifm)) +
> +		    SZ_NLATTR_DATA_OF(sizeof(name)) +
> +		    SZ_NLATTR_NEST * 2 +
> +		    SZ_NLATTR_STRZ_OF("vxlan") +
> +		    SZ_NLATTR_DATA_OF(sizeof(uint32_t)) +
> +		    SZ_NLATTR_DATA_OF(sizeof(uint16_t)) +
> +		    SZ_NLATTR_DATA_OF(sizeof(uint8_t)) * 3 +
> +		    MNL_BUF_EXTRA_SPACE];
> +	struct nlattr *na_info;
> +	struct nlattr *na_vxlan;
> +	rte_be16_t vxlan_port = rte_cpu_to_be_16(port);
> +	int ret;
> +
> +	vtep = rte_zmalloc(__func__, sizeof(*vtep), alignof(struct tcf_vtep));
> +	if (!vtep) {
> +		rte_flow_error_set
> +			(error, ENOMEM, RTE_FLOW_ERROR_TYPE_UNSPECIFIED,
> +			 NULL, "unadble to allocate memory for VTEP desc");
> +		return NULL;
> +	}
> +	*vtep = (struct tcf_vtep){
> +			.port = port,
> +			.local = LIST_HEAD_INITIALIZER(),
> +			.neigh = LIST_HEAD_INITIALIZER(),
> +	};
> +	memset(buf, 0, sizeof(buf));
> +	nlh = mnl_nlmsg_put_header(buf);
> +	nlh->nlmsg_type = RTM_NEWLINK;
> +	nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE  | NLM_F_EXCL;
> +	ifm = mnl_nlmsg_put_extra_header(nlh, sizeof(*ifm));
> +	ifm->ifi_family = AF_UNSPEC;
> +	ifm->ifi_type = 0;
> +	ifm->ifi_index = 0;
> +	ifm->ifi_flags = IFF_UP;
> +	ifm->ifi_change = 0xffffffff;
> +	snprintf(name, sizeof(name), "%s%u", MLX5_VXLAN_DEVICE_PFX, port);
> +	mnl_attr_put_strz(nlh, IFLA_IFNAME, name);
> +	na_info = mnl_attr_nest_start(nlh, IFLA_LINKINFO);
> +	assert(na_info);
> +	mnl_attr_put_strz(nlh, IFLA_INFO_KIND, "vxlan");
> +	na_vxlan = mnl_attr_nest_start(nlh, IFLA_INFO_DATA);
> +	if (ifouter)
> +		mnl_attr_put_u32(nlh, IFLA_VXLAN_LINK, ifouter);
> +	assert(na_vxlan);
> +	mnl_attr_put_u8(nlh, IFLA_VXLAN_COLLECT_METADATA, 1);
> +	mnl_attr_put_u8(nlh, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, 1);
> +	mnl_attr_put_u8(nlh, IFLA_VXLAN_LEARNING, 0);
> +	mnl_attr_put_u16(nlh, IFLA_VXLAN_PORT, vxlan_port);
> +	mnl_attr_nest_end(nlh, na_vxlan);
> +	mnl_attr_nest_end(nlh, na_info);
> +	assert(sizeof(buf) >= nlh->nlmsg_len);
> +	ret = flow_tcf_nl_ack(tcf, nlh, 0, NULL, NULL);
> +	if (ret) {
> +		DRV_LOG(WARNING,
> +			"netlink: VTEP %s create failure (%d)",
> +			name, rte_errno);
> +		if (rte_errno != EEXIST || ifouter)
> +			/*
> +			 * Some unhandled error occurred or device is
> +			 * for encapsulation and cannot be shared.
> +			 */
> +			goto error;
> +	} else {
> +		/*
> +		 * Mark device we actually created.
> +		 * We should explicitly delete
> +		 * when we do not need it anymore.
> +		 */
> +		vtep->created = 1;
> +	}
> +	/* Try to get ifindex of created of pre-existing device. */
> +	ret = if_nametoindex(name);
> +	if (!ret) {
> +		DRV_LOG(WARNING,
> +			"VTEP %s failed to get index (%d)", name, errno);
> +		rte_flow_error_set
> +			(error, -errno,
> +			 RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL,
> +			 "netlink: failed to retrieve VTEP ifindex");
> +		goto error;
> +	}
> +	vtep->ifindex = ret;
> +	vtep->ifouter = ifouter;
> +	memset(buf, 0, sizeof(buf));
> +	nlh = mnl_nlmsg_put_header(buf);
> +	nlh->nlmsg_type = RTM_NEWLINK;
> +	nlh->nlmsg_flags = NLM_F_REQUEST;
> +	ifm = mnl_nlmsg_put_extra_header(nlh, sizeof(*ifm));
> +	ifm->ifi_family = AF_UNSPEC;
> +	ifm->ifi_type = 0;
> +	ifm->ifi_index = vtep->ifindex;
> +	ifm->ifi_flags = IFF_UP;
> +	ifm->ifi_change = IFF_UP;
> +	ret = flow_tcf_nl_ack(tcf, nlh, 0, NULL, NULL);
> +	if (ret) {
> +		rte_flow_error_set(error, -errno,
> +				   RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL,
> +				   "netlink: failed to set VTEP link up");
> +		DRV_LOG(WARNING, "netlink: VTEP %s set link up failure (%d)",
> +			name, rte_errno);
> +		goto clean;
> +	}
> +	ret = mlx5_flow_tcf_init(tcf, vtep->ifindex, error);
> +	if (ret) {
> +		DRV_LOG(WARNING, "VTEP %s init failure (%d)", name, rte_errno);
> +		goto clean;
> +	}
> +	DRV_LOG(INFO, "VTEP create (%d, %d)", vtep->port, vtep->ifindex);
> +	vtep->refcnt = 1;
> +	return vtep;
> +clean:
> +	flow_tcf_vtep_delete(tcf, vtep);
> +	return NULL;
> +error:
> +	rte_free(vtep);
> +	return NULL;
> +}
> +#else
> +static struct tcf_vtep*
> +flow_tcf_vtep_create(struct mlx5_flow_tcf_context *tcf __rte_unused,
> +		     unsigned int ifouter __rte_unused,
> +		     uint16_t port __rte_unused,
> +		     struct rte_flow_error *error)
> +{
> +	rte_flow_error_set(error, ENOTSUP,
> +			 RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL,
> +			 "netlink: failed to create VTEP, "
> +			 "VXLAN metadata are not supported by kernel");
> +	return NULL;
> +}
> +#endif /* HAVE_IFLA_VXLAN_COLLECT_METADATA */
> +
> +/**
> + * Acquire target interface index for VXLAN tunneling decapsulation.
> + * In order to share the UDP port within the other interfaces the
> + * VXLAN device created as not attached to any interface (if created).
> + *
> + * @param[in] tcf
> + *   Context object initialized by mlx5_flow_tcf_context_create().
> + * @param[in] dev_flow
> + *   Flow tcf object with tunnel structure pointer set.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL.
> + * @return
> + *   Interface descriptor pointer on success,
> + *   NULL otherwise and rte_errno is set.
> + */
> +static struct tcf_vtep*
> +flow_tcf_decap_vtep_acquire(struct mlx5_flow_tcf_context *tcf,
> +			    struct mlx5_flow *dev_flow,
> +			    struct rte_flow_error *error)
> +{
> +	struct tcf_vtep *vtep;
> +	uint16_t port = dev_flow->tcf.vxlan_decap->udp_port;
> +
> +	LIST_FOREACH(vtep, &vtep_list_vxlan, next) {
> +		if (vtep->port == port)
> +			break;
> +	}
> +	if (vtep && vtep->ifouter) {
> +		rte_flow_error_set(error, -errno,
> +				   RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL,
> +				   "Failed to create decap VTEP with specified"
> +				   " UDP port, atatched device exists");
> +		return NULL;
> +	}
> +	if (vtep) {
> +		/* Device exists, just increment the reference counter. */
> +		vtep->refcnt++;
> +		assert(vtep->ifindex);
> +		return vtep;
> +	}
> +	/* No decapsulation device exists, try to create the new one. */
> +	vtep = flow_tcf_vtep_create(tcf, 0, port, error);
> +	if (vtep)
> +		LIST_INSERT_HEAD(&vtep_list_vxlan, vtep, next);
> +	return vtep;
> +}
> +
> +/**
> + * Aqcuire target interface index for VXLAN tunneling encapsulation.
> + *
> + * @param[in] tcf
> + *   Context object initialized by mlx5_flow_tcf_context_create().
> + * @param[in] ifouter
> + *   Network interface index to attach VXLAN encap device to.
> + * @param[in] dev_flow
> + *   Flow tcf object with tunnel structure pointer set.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL.
> + * @return
> + *   Interface descriptor pointer on success,
> + *   NULL otherwise and rte_errno is set.
> + */
> +static struct tcf_vtep*
> +flow_tcf_encap_vtep_acquire(struct mlx5_flow_tcf_context *tcf,
> +			    unsigned int ifouter,
> +			    struct mlx5_flow *dev_flow __rte_unused,
> +			    struct rte_flow_error *error)
> +{
> +	static uint16_t encap_port = MLX5_VXLAN_PORT_MIN - 1;
> +	struct tcf_vtep *vtep;
> +
> +	assert(ifouter);
> +	/* Look whether the attached VTEP for encap is created. */
> +	LIST_FOREACH(vtep, &vtep_list_vxlan, next) {
> +		if (vtep->ifouter == ifouter)
> +			break;
> +	}
> +	if (vtep) {
> +		/* VTEP already exists, just increment the reference. */
> +		vtep->refcnt++;
> +	} else {
> +		uint16_t pcnt;
> +
> +		/* Not found, we should create the new attached VTEP. */
> +		for (pcnt = 0; pcnt <= (MLX5_VXLAN_PORT_MAX
> +				     - MLX5_VXLAN_PORT_MIN); pcnt++) {
> +			encap_port++;
> +			/* Wraparound the UDP port index. */
> +			if (encap_port < MLX5_VXLAN_PORT_MIN ||
> +			    encap_port > MLX5_VXLAN_PORT_MAX)
> +				encap_port = MLX5_VXLAN_PORT_MIN;
> +			/* Check whether UDP port is in already in use. */
> +			LIST_FOREACH(vtep, &vtep_list_vxlan, next) {
> +				if (vtep->port == encap_port)
> +					break;
> +			}
> +			if (vtep) {
> +				/* Port is in use, try the next one. */
> +				vtep = NULL;
> +				continue;
> +			}
> +			vtep = flow_tcf_vtep_create(tcf, ifouter,
> +						    encap_port, error);
> +			if (vtep) {
> +				LIST_INSERT_HEAD(&vtep_list_vxlan, vtep, next);
> +				break;
> +			}
> +			if (rte_errno != EEXIST)
> +				break;
> +		}
> +		if (!vtep)
> +			return NULL;
> +	}
> +	assert(vtep->ifouter == ifouter);
> +	assert(vtep->ifindex);
> +	return vtep;
> +}
> +
> +/**
> + * Acquires target interface index for tunneling of any type.
> + * Creates the new VTEP if needed.
> + *
> + * @param[in] tcf
> + *   Context object initialized by mlx5_flow_tcf_context_create().
> + * @param[in] ifouter
> + *   Network interface index to attach VXLAN encap device to.
> + * @param[in] dev_flow
> + *   Flow tcf object with tunnel structure pointer set.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL.
> + * @return
> + *   Interface descriptor pointer on success,
> + *   NULL otherwise and rte_errno is set.
> + */
> +static struct tcf_vtep*
> +flow_tcf_vtep_acquire(struct mlx5_flow_tcf_context *tcf,
> +		      unsigned int ifouter,
> +		      struct mlx5_flow *dev_flow,
> +		      struct rte_flow_error *error)
> +{
> +	struct tcf_vtep *vtep = NULL;
> +
> +	assert(dev_flow->tcf.tunnel);
> +	pthread_mutex_lock(&vtep_list_mutex);
> +	switch (dev_flow->tcf.tunnel->type) {
> +	case FLOW_TCF_TUNACT_VXLAN_ENCAP:
> +		vtep = flow_tcf_encap_vtep_acquire(tcf, ifouter,
> +						  dev_flow, error);
> +		break;
> +	case FLOW_TCF_TUNACT_VXLAN_DECAP:
> +		vtep = flow_tcf_decap_vtep_acquire(tcf, dev_flow, error);
> +		break;
> +	default:
> +		rte_flow_error_set(error, ENOTSUP,
> +				RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL,
> +				"unsupported tunnel type");
> +		break;
> +	}
> +	pthread_mutex_unlock(&vtep_list_mutex);
> +	return vtep;
> +}
> +
> +/**
> + * Release tunneling interface by ifindex. Decrements reference
> + * counter and actually removes the device if counter is zero.
> + *
> + * @param[in] tcf
> + *   Context object initialized by mlx5_flow_tcf_context_create().
> + * @param[in] vtep
> + *   VTEP device descriptor structure.
> + * @param[in] dev_flow
> + *   Flow tcf object with tunnel structure pointer set.
> + */
> +static void
> +flow_tcf_vtep_release(struct mlx5_flow_tcf_context *tcf,
> +		      struct tcf_vtep *vtep,
> +		      struct mlx5_flow *dev_flow)
> +{
> +	assert(dev_flow->tcf.tunnel);
> +	pthread_mutex_lock(&vtep_list_mutex);
> +	switch (dev_flow->tcf.tunnel->type) {
> +	case FLOW_TCF_TUNACT_VXLAN_DECAP:
> +		break;
> +	case FLOW_TCF_TUNACT_VXLAN_ENCAP:
> +		break;
> +	default:
> +		assert(false);
> +		DRV_LOG(WARNING, "Unsupported tunnel type");
> +		break;
> +	}
> +	assert(vtep->refcnt);
> +	if (--vtep->refcnt == 0) {
> +		LIST_REMOVE(vtep, next);
> +		flow_tcf_vtep_delete(tcf, vtep);
> +	}
> +	pthread_mutex_unlock(&vtep_list_mutex);
> +}
> +
> +
>  /**
>   * Apply flow to E-Switch by sending Netlink message.
>   *
> @@ -3775,11 +4186,35 @@ struct pedit_parser {
>  	dev_flow = LIST_FIRST(&flow->dev_flows);
>  	/* E-Switch flow can't be expanded. */
>  	assert(!LIST_NEXT(dev_flow, next));
> +	if (dev_flow->tcf.applied)
> +		return 0;
>  	nlh = dev_flow->tcf.nlh;
>  	nlh->nlmsg_type = RTM_NEWTFILTER;
>  	nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL;
> -	if (!flow_tcf_nl_ack(ctx, nlh, 0, NULL, NULL))
> +	if (dev_flow->tcf.tunnel) {
> +		/*
> +		 * Replace the interface index, target for
> +		 * encapsulation, source for decapsulation.
> +		 */
> +		assert(!dev_flow->tcf.tunnel->vtep);
> +		assert(dev_flow->tcf.tunnel->ifindex_ptr);
> +		/* Acquire actual VTEP device when rule is being applied. */
> +		dev_flow->tcf.tunnel->vtep =
> +			flow_tcf_vtep_acquire(ctx,
> +					dev_flow->tcf.tunnel->ifindex_org,
> +					dev_flow, error);
> +		if (!dev_flow->tcf.tunnel->vtep)
> +			return -rte_errno;
> +		DRV_LOG(INFO, "Replace ifindex: %d->%d",
> +				dev_flow->tcf.tunnel->vtep->ifindex,
> +				dev_flow->tcf.tunnel->ifindex_org);
> +		*dev_flow->tcf.tunnel->ifindex_ptr =
> +			dev_flow->tcf.tunnel->vtep->ifindex;
> +	}
> +	if (!flow_tcf_nl_ack(ctx, nlh, 0, NULL, NULL)) {
> +		dev_flow->tcf.applied = 1;
>  		return 0;
> +	}
>  	return rte_flow_error_set(error, rte_errno,
>  				  RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL,
>  				  "netlink: failed to create TC flow rule");
> @@ -3808,10 +4243,20 @@ struct pedit_parser {
>  		return;
>  	/* E-Switch flow can't be expanded. */
>  	assert(!LIST_NEXT(dev_flow, next));
> -	nlh = dev_flow->tcf.nlh;
> -	nlh->nlmsg_type = RTM_DELTFILTER;
> -	nlh->nlmsg_flags = NLM_F_REQUEST;
> -	flow_tcf_nl_ack(ctx, nlh, 0, NULL, NULL);
> +	if (dev_flow->tcf.applied) {
> +		nlh = dev_flow->tcf.nlh;
> +		nlh->nlmsg_type = RTM_DELTFILTER;
> +		nlh->nlmsg_flags = NLM_F_REQUEST;
> +		flow_tcf_nl_ack(ctx, nlh, 0, NULL, NULL);
> +		if (dev_flow->tcf.tunnel) {
> +			assert(dev_flow->tcf.tunnel->vtep);
> +			flow_tcf_vtep_release(ctx,
> +				dev_flow->tcf.tunnel->vtep,
> +				dev_flow);
> +			dev_flow->tcf.tunnel->vtep = NULL;
> +		}
> +		dev_flow->tcf.applied = 0;
> +	}
>  }
>  
>  /**
> @@ -4338,7 +4783,9 @@ struct pedit_parser {
>  	struct nlmsghdr *nlh;
>  	struct tcmsg *tcm;
>  	alignas(struct nlmsghdr)
> -	uint8_t buf[mnl_nlmsg_size(sizeof(*tcm) + 128)];
> +	uint8_t buf[mnl_nlmsg_size(sizeof(*tcm)) +
> +		    SZ_NLATTR_STRZ_OF("ingress") +
> +		    MNL_BUF_EXTRA_SPACE];
>  
>  	/* Destroy existing ingress qdisc and everything attached to it. */
>  	nlh = mnl_nlmsg_put_header(buf);
> @@ -4349,6 +4796,7 @@ struct pedit_parser {
>  	tcm->tcm_ifindex = ifindex;
>  	tcm->tcm_handle = TC_H_MAKE(TC_H_INGRESS, 0);
>  	tcm->tcm_parent = TC_H_INGRESS;
> +	assert(sizeof(buf) >= nlh->nlmsg_len);
>  	/* Ignore errors when qdisc is already absent. */
>  	if (flow_tcf_nl_ack(ctx, nlh, 0, NULL, NULL) &&
>  	    rte_errno != EINVAL && rte_errno != ENOENT)
> @@ -4366,6 +4814,7 @@ struct pedit_parser {
>  	tcm->tcm_handle = TC_H_MAKE(TC_H_INGRESS, 0);
>  	tcm->tcm_parent = TC_H_INGRESS;
>  	mnl_attr_put_strz_check(nlh, sizeof(buf), TCA_KIND, "ingress");
> +	assert(sizeof(buf) >= nlh->nlmsg_len);
>  	if (flow_tcf_nl_ack(ctx, nlh, 0, NULL, NULL))
>  		return rte_flow_error_set(error, rte_errno,
>  					  RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL,
> -- 
> 1.8.3.1
>