Re: [dpdk-dev] [PATCH 12/12] examples/l3fwd: add option to parse ptype

["Ananyev, Konstantin" <konstantin.ananyev@intel.com>]

Hi Jianfeng,
> -----Original Message-----
> From: Tan, Jianfeng
> Sent: Thursday, December 31, 2015 6:53 AM
> To: dev@dpdk.org
> Cc: Zhang, Helin; Ananyev, Konstantin; Tan, Jianfeng
> Subject: [PATCH 12/12] examples/l3fwd: add option to parse ptype
> 
> Firstly, use rte_eth_dev_get_ptype_info() API to check if device will
> parse needed packet type. If not, specifying the newly added option,
> --parse-ptype to do it in the callback softly.
> 
> Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
> ---
>  examples/l3fwd/main.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 86 insertions(+)
> 
> diff --git a/examples/l3fwd/main.c b/examples/l3fwd/main.c
> index 5b0c2dd..ccbdce3 100644
> --- a/examples/l3fwd/main.c
> +++ b/examples/l3fwd/main.c
> @@ -174,6 +174,7 @@ static __m128i val_eth[RTE_MAX_ETHPORTS];
>  static uint32_t enabled_port_mask = 0;
>  static int promiscuous_on = 0; /**< Ports set in promiscuous mode off by default. */
>  static int numa_on = 1; /**< NUMA is enabled by default. */
> +static int parse_ptype = 0; /**< parse packet type using rx callback */
> 
>  #if (APP_LOOKUP_METHOD == APP_LOOKUP_EXACT_MATCH)
>  static int ipv6 = 0; /**< ipv6 is false by default. */
> @@ -2022,6 +2023,7 @@ parse_eth_dest(const char *optarg)
>  #define CMD_LINE_OPT_IPV6 "ipv6"
>  #define CMD_LINE_OPT_ENABLE_JUMBO "enable-jumbo"
>  #define CMD_LINE_OPT_HASH_ENTRY_NUM "hash-entry-num"
> +#define CMD_LINE_OPT_PARSE_PTYPE "parse-ptype"
> 
>  /* Parse the argument given in the command line of the application */
>  static int
> @@ -2038,6 +2040,7 @@ parse_args(int argc, char **argv)
>  		{CMD_LINE_OPT_IPV6, 0, 0, 0},
>  		{CMD_LINE_OPT_ENABLE_JUMBO, 0, 0, 0},
>  		{CMD_LINE_OPT_HASH_ENTRY_NUM, 1, 0, 0},
> +		{CMD_LINE_OPT_PARSE_PTYPE, 0, 0, 0},
>  		{NULL, 0, 0, 0}
>  	};
> 
> @@ -2125,6 +2128,12 @@ parse_args(int argc, char **argv)
>  				}
>  			}
>  #endif
> +			if (!strncmp(lgopts[option_index].name, CMD_LINE_OPT_PARSE_PTYPE,
> +				sizeof(CMD_LINE_OPT_PARSE_PTYPE))) {
> +				printf("soft parse-ptype is enabled \n");
> +				parse_ptype = 1;
> +			}
> +
>  			break;
> 
>  		default:
> @@ -2559,6 +2568,75 @@ check_all_ports_link_status(uint8_t port_num, uint32_t port_mask)
>  	}
>  }
> 
> +static int
> +check_packet_type_ok(int portid)
> +{
> +	int i;
> +	int ret;
> +	uint32_t ptypes[RTE_PTYPE_L3_MAX_NUM];
> +	int ptype_l3_ipv4 = 0, ptype_l3_ipv6 = 0;
> +
> +	ret = rte_eth_dev_get_ptype_info(portid, RTE_PTYPE_L3_MASK, ptypes);
> +	for (i = 0; i < ret; ++i) {
> +		if (ptypes[i] & RTE_PTYPE_L3_IPV4)
> +			ptype_l3_ipv4 = 1;
> +		if (ptypes[i] & RTE_PTYPE_L3_IPV6)
> +			ptype_l3_ipv6 = 1;
> +	}
> +
> +	if (ptype_l3_ipv4 == 0)
> +		printf("port %d cannot parse RTE_PTYPE_L3_IPV4\n", portid);
> +
> +	if (ptype_l3_ipv6 == 0)
> +		printf("port %d cannot parse RTE_PTYPE_L3_IPV6\n", portid);
> +
> +	if (ptype_l3_ipv4 || ptype_l3_ipv6)
> +		return 1;
> +
> +	return 0;
> +}
> +static inline void
> +parse_packet_type(struct rte_mbuf *m)
> +{
> +	struct ether_hdr *eth_hdr;
> +	struct vlan_hdr *vlan_hdr;
> +	uint32_t packet_type = 0;
> +	uint16_t ethertype;
> +
> +	eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);
> +	ethertype = rte_be_to_cpu_16(eth_hdr->ether_type);
> +	if (ethertype == ETHER_TYPE_VLAN) {

I don't think either LPM or EM support packets with VLAN right now.
So, probably there is no need to support it here.

> +		vlan_hdr = (struct vlan_hdr *)(eth_hdr + 1);
> +		ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto);
> +	}
> +	switch (ethertype) {
> +	case ETHER_TYPE_IPv4:
> +		packet_type |= RTE_PTYPE_L3_IPV4_EXT_UNKNOWN;
> +		break;
> +	case ETHER_TYPE_IPv6:
> +		packet_type |= RTE_PTYPE_L3_IPV6_EXT_UNKNOWN;
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	m->packet_type = packet_type;

Probably:
m->packet_type |= packet_type;
in case HW supports some other packet types.

> +}
> +
> +static uint16_t
> +cb_parse_packet_type(uint8_t port __rte_unused,
> +		uint16_t queue __rte_unused,
> +		struct rte_mbuf *pkts[],
> +		uint16_t nb_pkts,
> +		uint16_t max_pkts __rte_unused,
> +		void *user_param __rte_unused)
> +{
> +	unsigned i;
> +
> +	for (i = 0; i < nb_pkts; ++i)
> +		parse_packet_type(pkts[i]);
> +}
> +
>  int
>  main(int argc, char **argv)
>  {
> @@ -2672,6 +2750,11 @@ main(int argc, char **argv)
>  				rte_exit(EXIT_FAILURE, "rte_eth_tx_queue_setup: err=%d, "
>  					"port=%d\n", ret, portid);
> 
> +			if (!check_packet_type_ok(portid) && !parse_ptype)
> +				rte_exit(EXIT_FAILURE,
> +						"port %d cannot parse packet type, please add --%s\n",
> +						portid, CMD_LINE_OPT_PARSE_PTYPE);
> +
>  			qconf = &lcore_conf[lcore_id];
>  			qconf->tx_queue_id[portid] = queueid;
>  			queueid++;
> @@ -2705,6 +2788,9 @@ main(int argc, char **argv)
>  			if (ret < 0)
>  				rte_exit(EXIT_FAILURE, "rte_eth_rx_queue_setup: err=%d,"
>  						"port=%d\n", ret, portid);
> +			if (parse_ptype)
> +				rte_eth_add_rx_callback(portid, queueid,
> +						cb_parse_packet_type, NULL);

Need to check return value.
Konstantin

>  		}
>  	}
> 
> --
> 2.1.4