Hi Mats, yes, you are right, there is an issue in the pcap driver that it is not allocating mbufs correctly. We are working on a fix.
Regards, /Bruce > -----Original Message----- > From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Mats Liljegren > Sent: Tuesday, November 26, 2013 1:07 PM > To: dev at dpdk.org > Subject: [dpdk-dev] Question: Can't make pcap and refcnt to match > > I have had stability problems when using pcap in my little application. My > application is a simple benchmark applications that is trying to see how > much data I can send and receive. > > It has one lcore per NIC, where each lcore handles transmit and receive. On > the hardware, I make a loopback between two NICs, so the NICs are in > practice paired. I currently use 4 NICs and therefore 4 lcores. Port 0 sends > to > port 1 and vice versa. Port 2 send to port 3 and vice versa. One pair is using > DPDK hardware driver against a dual > i350 NIC. The other pair is using pcap against two of the four on-board NICs. > > When enabling everything saying "DEBUG" in its name in the .config file, I > get the following error: > > PMD: rte_eth_dev_config_restore: port 1: MAC address array not > supported > PMD: rte_eth_promiscuous_disable: Function not supported > PMD: rte_eth_allmulticast_disable: Function not supported > Speed: 10000 Mbps, full duplex > Port 1 up and running. > PMD: e1000_put_hw_semaphore_generic(): > e1000_put_hw_semaphore_generic PANIC in rte_mbuf_sanity_check(): > bad ref cnt > PANIC in rte_mbuf_sanity_check(): > bad ref cnt > PMD: e1000_release_phy_82575(): e1000_release_phy_82575 > PMD: e1000_release_swfw_sync_82575(): > e1000_release_swfw_sync_82575 > PMD: e1000_get_hw_semaphore_generic(): > e1000_get_hw_semaphore_generic > PMD: eth_igb_rx_queue_setup(): sw_ring=0x7fff776eefc0 > hw_ring=0x7fff76830480 dma_addr=0x464630480 > > PMD: e1000_put_hw_semaphore_generic(): > e1000_put_hw_semaphore_generic > PMD: To improve 1G driver performance, consider setting the TX WTHRESH > value to 4, 8, or 16. > PMD: eth_igb_tx_queue_setup(): sw_ring=0x7fff776ece40 > hw_ring=0x7fff76840500 dma_addr=0x464640500 > > PMD: eth_igb_start(): >> > PMD: e1000_read_phy_reg_82580(): e1000_read_phy_reg_82580 > PMD: e1000_acquire_phy_82575(): e1000_acquire_phy_82575 > PMD: e1000_acquire_swfw_sync_82575(): > e1000_acquire_swfw_sync_82575 > PMD: e1000_get_hw_semaphore_generic(): > e1000_get_hw_semaphore_generic > PMD: e1000_get_cfg_done_82575(): e1000_get_cfg_done_82575 > PMD: e1000_put_hw_semaphore_generic(): > e1000_put_hw_semaphore_generic > PMD: e1000_read_phy_reg_mdic(): e1000_read_phy_reg_mdic > 9: [/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7ffff72a89cd]] > 8: [/lib/x86_64-linux-gnu/libpthread.so.0(+0x7f6e) [0x7ffff757df6e]] > 7: [/home/mlil/dpdk-demo/build/enea-demo(eal_thread_loop+0x1b9) > [0x492669]] > 6: [/home/mlil/dpdk-demo/build/enea-demo() [0x4150bc]] > 5: [/home/mlil/dpdk-demo/build/enea-demo() [0x414d0b]] > 4: [/home/mlil/dpdk-demo/build/enea-demo() [0x4116ef]] > 3: [/home/mlil/dpdk-demo/build/enea- > demo(rte_mbuf_sanity_check+0xa7) [0x484707]] > 2: [/home/mlil/dpdk-demo/build/enea-demo(__rte_panic+0xc1) > [0x40f788]] > 1: [/home/mlil/dpdk-demo/build/enea-demo(rte_dump_stack+0x18) > [0x493f68]] > PMD: e1000_release_phy_82575(): e1000_release_phy_82575 > PMD: e1000_release_swfw_sync_82575(): > e1000_release_swfw_sync_82575 > PMD: e1000_get_hw_semaphore_generic(): > e1000_get_hw_semaphore_generic > > I checked the source code for pcap, and in the file rte_eth_pcap.c, function > eth_pcap_rx(), I make the following observation: > > It pre-allocates a number of mbufs (64 to be exact). It then fills these mbufs > with data and returns them. The pre-allocation seems to only be done once, > and then they are re-used. > > This confuses me. How does this work when more than 64 packets are > requested? I see no safety checks for this. > > Aren't application supposed to call rte_pktmbuf_free() on the returned > mbufs? If so, the pre-allocated mbufs will have been free'd as far as I can > see and can therefore not be re-used. > > What am I missing here? > > Regards > Mats
