On Fri, Jan 27, 2017 at 10:31:52PM +0000, Sridhar Pitchai wrote: > Thanks Bruce. > > > I have created eth_dev from the rings as below. > rt = rte_eth_from_rings(port_p->name, > (struct rte_ring * const*)port_p->rx_ring_p, 2, > (struct rte_ring * const*)port_p->tx_ring_p, 2, > rte_socket_id()); > > Lets say I have a call back something like > > pkt_rx(void * pkt_p, struct pkt_metadata_t *meta_p) > > which is called when there is a pkt at the chip. > inside this function(pkt_rx) i will find the port and the corresponding > ring_p and > enqueue the pkt into the queue. I am assuming this should work. Kindly > correct me if i misunderstood you. >
Yes, it should work. > > question 2: > Can use this eth_dev to create KNI interface, like below. > rte_eth_dev_info_get(fp_p->port_list[port].key.port_id, &dev_info); > ; > ; > ; > ops.port_id = fp_p->port_list[port].key.port_id; // rt from > rte_eth_from_rings(...) > ops.change_mtu = _kni_ifconfig_mtu; // static function > ops.config_network_if = _kni_ifconfig; // static functions > PORT(fp_p, port).kni_p = rte_kni_alloc(PORT(fp_p, port).mbuf_p, > &conf, &ops); > > I am assuming this should work as well. I find the netdevs created but when i > try to configure > them i am facing the following error. > > root@ VM snaproute/softpath (master) >ifconfig PORT_8 > PORT_8 Link encap:Ethernet HWaddr be:35:c3:0f:f8:2f > BROADCAST MULTICAST MTU:1500 Metric:1 > RX packets:0 errors:0 dropped:0 overruns:0 frame:0 > TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:1000 > RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) > > root@ VM snaproute/softpath (master) >ifconfig PORT_8 20.1.1.1/24 up > SIOCSIFFLAGS: Timer expired > SIOCSIFFLAGS: Timer expired > root@ VM snaproute/softpath (master) > > +Ferruh as KNI maintainer, to see if he can help out with this question. /Bruce > Thanks for the help. > > Thanks, > Sridhar Pitchai > > > ________________________________ > From: Bruce Richardson <bruce.richard...@intel.com> > Sent: Friday, January 27, 2017 1:36 PM > To: Sridhar Pitchai > Cc: dev@dpdk.org > Subject: Re: [dpdk-dev] rte_eth_from_rings > > On Fri, Jan 27, 2017 at 07:16:25PM +0000, Sridhar Pitchai wrote: > > Hi, > > > > I am trying to write a data path for packets punted to CPU(slowpath) from > > vender silicon like broadcom. I am planing to use "rte_eth_from_rings" like > > model where I will be able to read and write to the ring for the packets > > punted from vendor chip. > > > > > > the eth_dev abstraction provided by "rte_eth_from_rings" helps to build the > > dpdk data path. Can someone help me on how to read and write to the rings > > that is emulating the eth_dev. > > > > > To use the rings like an ethdev just use rte_eth_rx_burst and > rte_eth_tx_burst, passing in the port id of your newly created rings > ethdev. To access them directly as rings, just use the ring > enqueue/dequeue functions passing in the ring pointer as normal. > > Regards, > /Bruce
