[dpdk-dev] Packet data out of bounds after rte_eth_rx_burst

[Bruce Richardson]

On Wed, Mar 25, 2015 at 10:22:49AM +0200, Dor Green wrote:
> The printout:
> PMD: eth_ixgbe_dev_init(): MAC: 2, PHY: 11, SFP+: 4
> PMD: eth_ixgbe_dev_init(): port 0 vendorID=0x8086 deviceID=0x154d
> PMD: ixgbe_dev_rx_queue_setup(): sw_ring=0x7f80c0af0e40
> hw_ring=0x7f811630ce00 dma_addr=0xf1630ce00
> PMD: check_rx_burst_bulk_alloc_preconditions(): Rx Burst Bulk Alloc
> Preconditions: rxq->rx_free_thresh=0, RTE_PMD_IXGBE_RX_MAX_BURST=32
> PMD: ixgbe_dev_rx_queue_setup(): Rx Burst Bulk Alloc Preconditions are
> not satisfied, Scattered Rx is requested, or
> RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC is not enabled (port=0, queue=0).
> PMD: check_rx_burst_bulk_alloc_preconditions(): Rx Burst Bulk Alloc
> Preconditions: rxq->rx_free_thresh=0, RTE_PMD_IXGBE_RX_MAX_BURST=32
> PMD: ixgbe_dev_tx_queue_setup(): sw_ring=0x7f80c0af0900
> hw_ring=0x7f811631ce80 dma_addr=0xf1631ce80
> PMD: set_tx_function(): Using full-featured tx code path
> PMD: set_tx_function():  - txq_flags = 0 [IXGBE_SIMPLE_FLAGS=f01]
> PMD: set_tx_function():  - tx_rs_thresh = 32 [RTE_PMD_IXGBE_TX_MAX_BURST=32]
> 
> Can't seem to get any example app to crash. Is there something I can
> run on one port which will look at the actual data of the packets?
> 
> The mempool is (I think) set up normally:
> 
> pktmbuf_pool = rte_mempool_create("mbuf_pool", MBUFNB, MBUFSZ, 0,
>                                   sizeof(struct rte_pktmbuf_pool_private),
>                                   rte_pktmbuf_pool_init, NULL,
>                                   rte_pktmbuf_init, NULL, NUMA_SOCKET, 0);
> 
> 
> For good measure, here's the rest of the port setup (shortened, in
> addition to what I showed below):
> 
> static struct rte_eth_rxconf const rxconf = {
>     .rx_thresh = {
>         .pthresh = 8,
>         .hthresh = 8,
>         .wthresh = 100,

This value for wthresh looks very high. Can you perhaps just try using the
defaults for the thresholds. [Passing in a NULL instead of the rxconf will just
use the defaults for rx_queue_setup in latest DPDK versions.]

/Bruce


>     },
>     .rx_free_thresh = 0,
>     .rx_drop_en = 0,
> };
> 
> rte_eth_dev_configure(port, 1, 1, &ethconf);
> rte_eth_rx_queue_setup(port, 0, hwsize, NUMA_SOCKET, &rxconf, pktmbuf_pool);
> rte_eth_dev_start(port);
> 
> 
> On Tue, Mar 24, 2015 at 6:21 PM, Bruce Richardson
> <bruce.richardson at intel.com> wrote:
> > On Tue, Mar 24, 2015 at 04:10:18PM +0200, Dor Green wrote:
> >> 1 . The eth_conf is:
> >>
> >> static struct rte_eth_conf const ethconf = {
> >>     .link_speed = 0,
> >>     .link_duplex = 0,
> >>
> >>     .rxmode = {
> >>         .mq_mode = ETH_MQ_RX_RSS,
> >>         .max_rx_pkt_len = ETHER_MAX_LEN,
> >>         .split_hdr_size = 0,
> >>         .header_split = 0,
> >>         .hw_ip_checksum = 0,
> >>         .hw_vlan_filter = 0,
> >>         .jumbo_frame = 0,
> >>         .hw_strip_crc = 0,   /**< CRC stripped by hardware */
> >>     },
> >>
> >>     .txmode = {
> >>     },
> >>
> >>     .rx_adv_conf = {
> >>         .rss_conf = {
> >>             .rss_key = NULL,
> >>             .rss_hf = ETH_RSS_IPV4 | ETH_RSS_IPV6,
> >>         }
> >>     },
> >>
> >>     .fdir_conf = {
> >>         .mode = RTE_FDIR_MODE_SIGNATURE,
> >>
> >>     },
> >>
> >>     .intr_conf = {
> >>         .lsc = 0,
> >>     },
> >> };
> >>
> >> I've tried setting jumbo frames on with a larger packet length and
> >> even turning off RSS/FDIR. No luck.
> >>
> >> I don't see anything relating to the port in the initial prints, what
> >> are you looking for?
> >
> > I'm looking for the PMD initialization text, like that shown below (from testpmd):
> > Configuring Port 0 (socket 0)
> > PMD: ixgbe_dev_tx_queue_setup(): sw_ring=0x7f9ba08cd700 hw_ring=0x7f9ba0b00080 dma_addr=0x36d00080
> > PMD: ixgbe_set_tx_function(): Using simple tx code path
> > PMD: ixgbe_set_tx_function(): Vector tx enabled.
> > PMD: ixgbe_dev_rx_queue_setup(): sw_ring=0x7f9ba08cce80 hw_ring=0x7f9ba0b10080 dma_addr=0x36d10080
> > PMD: ixgbe_set_rx_function(): Vector rx enabled, please make sure RX burst size no less than 32.
> > Port 0: 68:05:CA:04:51:3A
> > Configuring Port 1 (socket 0)
> > PMD: ixgbe_dev_tx_queue_setup(): sw_ring=0x7f9ba08cab40 hw_ring=0x7f9ba0b20100 dma_addr=0x36d20100
> > PMD: ixgbe_set_tx_function(): Using simple tx code path
> > PMD: ixgbe_set_tx_function(): Vector tx enabled.
> > PMD: ixgbe_dev_rx_queue_setup(): sw_ring=0x7f9ba08ca2c0 hw_ring=0x7f9ba0b30100 dma_addr=0x36d30100
> > PMD: ixgbe_set_rx_function(): Vector rx enabled, please make sure RX burst size no less than 32.
> > Port 1: 68:05:CA:04:51:38
> >
> > This tells us what RX and TX functions are going to be used for each port.
> >
> >>
> >> 2. The packet is a normal, albeit somewhat large (1239 bytes) TCP data
> >> packet (SSL certificate data, specifically).
> >> One important thing of note that I've just realised is that it's not
> >> this "packet of death" which causes the segmentation fault (i.e. has
> >> an out-of-bounds address for its data), but the packet afterwards-- no
> >> matter what packet it is.
> >>
> > Can this problem be reproduced using testpmd or any of the standard dpdk
> > example apps, by sending in the same packet sequence?
> >
> > Is there anything unusual being done in the setup of the mempool used for the
> > packet buffers?
> >
> > /Bruce
> >
> >>
> >> On Tue, Mar 24, 2015 at 3:17 PM, Bruce Richardson
> >> <bruce.richardson at intel.com> wrote:
> >> > On Tue, Mar 24, 2015 at 12:54:14PM +0200, Dor Green wrote:
> >> >> I've managed to fix it so 1.8 works, and the segmentation fault still occurs.
> >> >>
> >> >> On Tue, Mar 24, 2015 at 11:55 AM, Dor Green <dorgreen1 at gmail.com> wrote:
> >> >> > I tried 1.8, but that fails to initialize my device and fails at the pci probe:
> >> >> >     "Cause: Requested device 0000:04:00.1 cannot be used"
> >> >> > Can't even compile 2.0rc2 atm, getting:
> >> >> > "/usr/lib/gcc/x86_64-linux-gnu/4.6/include/emmintrin.h:701:1: note:
> >> >> > expected '__m128i' but argument is of type 'int'"
> >> >> > For reasons I don't understand.
> >> >> >
> >> >> > As for the example apps (in 1.7), I can run them properly but I don't
> >> >> > think any of them do the same processing as I do. Note that mine does
> >> >> > work with most packets.
> >> >> >
> >> >> >
> >> >
> >> > Couple of further questions:
> >> > 1. What config options are being used to configure the port and what is the
> >> > output printed at port initialization time? This is needed to let us track down
> >> > what specific RX path is being used inside the ixgbe driver
> >> > 2. What type of packets specifically cause problems? Is it reproducible with
> >> > one particular packet, or packet type? Are you sending in jumbo-frames?
> >> >
> >> > Regards,
> >> > /Bruce
> >> >
> >> >> > On Mon, Mar 23, 2015 at 11:24 PM, Matthew Hall <mhall at mhcomputing.net> wrote:
> >> >> >> On Mon, Mar 23, 2015 at 05:19:00PM +0200, Dor Green wrote:
> >> >> >>> I changed it to free and it still happens. Note that the segmentation fault
> >> >> >>> happens before that anyway.
> >> >> >>>
> >> >> >>> I am using 1.7.1 at the moment. I can try using a newer version.
> >> >> >>
> >> >> >> I'm using 1.7.X in my open-source DPDK-based app and it works, but I have an
> >> >> >> IGB 1-gigabit NIC though, and how RX / TX work are quite driver specific of
> >> >> >> course.
> >> >> >>
> >> >> >> I suspect there's some issue with how things are working in your IXGBE NIC
> >> >> >> driver / setup. Do the same failures occur inside of the DPDK's own sample
> >> >> >> apps?
> >> >> >>
> >> >> >> Matthew.