Can not patch original files in /usr/src/sys/dev/usb/ despite that
if_axenreg.h and if_axen.c files fetched directly from current CVS repo.

# patch -p0 < axen.patch
Hmm.. Lookd like a unified diff to me...
The text leading up to this was:
-------------------------
|--- sys/dev/usb/if_axenreg.h Fri Sep 16 22:17:07 2016
|+++ sys/dev/usb/if_axenreg.h Mon Jun 19 10:54:28 2017
-------------------------
Patching file sys/dev/usb/if_axenreg.h using Plan A...
Hunk #1 succeeded at 26.
Hunk #2 failed at 70.
1 out of 2 hunks failed--saving rejects to sys/dev/usb/if_axenreg.h.rej
Hmm... The next patch look like a unified diff to me...
The text leading up to this was:
-------------------------
|--- sys/dev/usb/if_axen.c.orig Tue Jun 12 15:36:59 2018
|+++ sys/dev/usb/if_axen.c Sun Jul 29 01:53:43 2018
-------------------------
Patching file sys/dev/usb/if_axen.c using Plan A...
Hunk #1 succeeded at 53.
Hunk #2 succeeded at 122 with fuzz 2.
Hunk #3 failed at 246.
Hunk #4 failed at 275.
Hunk #5 failed at 440.
Hunk #6 failed at 502.
Hunk #7 failed at 515.
Hunk #8 failed at 637.
Hunk #9 failed at 711.
Hunk #10 succeeded at 810 with fuzz 1.
Hunk #11 failed at 846.
Hunk #12 failed at 877.
Hunk #13 failed at 907.
Hunk #14 failed at 932.
Hunk #15 failed at 955.
Hunk #16 failed at 975.
Hunk #17 failed at 996.
Hunk #18 failed at 1029.
Hunk #19 failed at 1054.
16 out of 19 hunks failed--saving rejects to sys/dev/usb/if_axen.c.rej
done

On 7/30/2018 3:11 AM, sc.dy...@gmail.com wrote:
> Hi,
> 
> On 2018/07/27 09:14, Denis wrote:
>> Every time (after 2-3 minutes of work) ASIX Electronics USB-Ethernet
>> device reports:
>>
>> axen0: usb errors on rx: IOERROR
>> axen0: usb errors on rx: IOERROR
>> axen0: usb errors on tx: IOERROR
>> axen0: watchdog timeout
>> axen0: usb errors on tx: IOERROR
>>
>> The device hangs and must be reattached to have it working again for 2-3
>> minutes.
> 
> Do you want to try this patch?
> 
> -----
>  - header: fix comments
>  - header: fix unused L3 type mask definition
>  - rxeof: Avoid allocating mbuf if checksum errors are detected.
>  - rxeof: Avoid loop to extract packets if pkt_count is 0.
>  - rxeof: Add more sanity checks.
>  - rxeof: Increament if_ierror in some error paths.
>  - qctrl: Apply queuing control parameters from FreeBSD axge(4).
>  - qctrl: Set qctrl in miireg_statchg dynamically, not statically.
>  - Use DMA buffer aligned at 64KB boundary to avoid xhci bug.
> 
> 
> --- sys/dev/usb/if_axenreg.h    Fri Sep 16 22:17:07 2016
> +++ sys/dev/usb/if_axenreg.h    Mon Jun 19 10:54:28 2017
> @@ -26,8 +26,8 @@
>   *                     |    |     ++-----L3_type (1:ipv4, 0/2:ipv6)
>   *        pkt_len(13)  |    |     ||+ ++-L4_type(0: icmp, 1: UDP, 4: TCP)
>   * |765|43210 76543210|7654 3210 7654 3210|
> - *  ||+-crc_err              |+-L4_err |+-L4_CSUM_ERR
> - *  |+-mii_err               +--L3_err +--L3_CSUM_ERR
> + *  ||+-crc_err               |+-L4_err |+-L4_CSUM_ERR
> + *  |+-mii_err                +--L3_err +--L3_CSUM_ERR
>   *  +-drop_err
>   *
>   * ex) pkt_hdr 0x00680820
> @@ -70,7 +70,7 @@
>  #define   AXEN_RXHDR_L4_TYPE_TCP    0x4
>  
>  /* L3 packet type (2bit) */
> -#define AXEN_RXHDR_L3_TYPE_MASK    0x00000600
> +#define AXEN_RXHDR_L3_TYPE_MASK    0x00000060
>  #define AXEN_RXHDR_L3_TYPE_OFFSET    5
>  #define   AXEN_RXHDR_L3_TYPE_UNDEF    0x0
>  #define   AXEN_RXHDR_L3_TYPE_IPV4    0x1
> --- sys/dev/usb/if_axen.c.orig    Tue Jun 12 15:36:59 2018
> +++ sys/dev/usb/if_axen.c    Sun Jul 29 01:53:43 2018
> @@ -53,6 +53,7 @@
>  #include <dev/usb/usbdi_util.h>
>  #include <dev/usb/usbdivar.h>
>  #include <dev/usb/usbdevs.h>
> +#include <dev/usb/usb_mem.h>
>  
>  #include <dev/usb/if_axenreg.h>
>  
> @@ -121,6 +122,13 @@ void    axen_unlock_mii(struct axen_softc *sc);
>  
>  void    axen_ax88179_init(struct axen_softc *);
>  
> +struct axen_qctrl axen_bulk_size[] = {
> +    { 7, 0x4f, 0x00, 0x12, 0xff },
> +    { 7, 0x20, 0x03, 0x16, 0xff },
> +    { 7, 0xae, 0x07, 0x18, 0xff },
> +    { 7, 0xcc, 0x4c, 0x18, 0x08 }
> +};
> +
>  /* Get exclusive access to the MII registers */
>  void
>  axen_lock_mii(struct axen_softc *sc)
> @@ -238,6 +246,8 @@ axen_miibus_statchg(struct device *dev)
>      int            err;
>      uint16_t        val;
>      uWord            wval;
> +    uint8_t            linkstat = 0;
> +    int            qctrl;
>  
>      ifp = GET_IFP(sc);
>      if (mii == NULL || ifp == NULL ||
> @@ -265,27 +275,49 @@ axen_miibus_statchg(struct device *dev)
>          return;
>  
>      val = 0;
> -    if ((IFM_OPTIONS(mii->mii_media_active) & IFM_FDX) != 0)
> +    if ((IFM_OPTIONS(mii->mii_media_active) & IFM_FDX) != 0) {
>          val |= AXEN_MEDIUM_FDX;
> +        if ((IFM_OPTIONS(mii->mii_media_active) & IFM_ETH_TXPAUSE) != 0)
> +            val |= AXEN_MEDIUM_TXFLOW_CTRL_EN;
> +        if ((IFM_OPTIONS(mii->mii_media_active) & IFM_ETH_RXPAUSE) != 0)
> +            val |= AXEN_MEDIUM_RXFLOW_CTRL_EN;
> +    }
>  
> -    val |= (AXEN_MEDIUM_RECV_EN | AXEN_MEDIUM_ALWAYS_ONE);
> -    val |= (AXEN_MEDIUM_RXFLOW_CTRL_EN | AXEN_MEDIUM_TXFLOW_CTRL_EN);
> +    val |= AXEN_MEDIUM_RECV_EN;
>  
> +    /* bulkin queue setting */
> +    axen_lock_mii(sc);
> +    axen_cmd(sc, AXEN_CMD_MAC_READ, 1, AXEN_USB_UPLINK, &linkstat);
> +    axen_unlock_mii(sc);
> +
>      switch (IFM_SUBTYPE(mii->mii_media_active)) {
>      case IFM_1000_T:
>          val |= AXEN_MEDIUM_GIGA | AXEN_MEDIUM_EN_125MHZ;
> +        if (linkstat & AXEN_USB_SS)
> +            qctrl = 0;
> +        else if (linkstat & AXEN_USB_HS)
> +            qctrl = 1;
> +        else
> +            qctrl = 3;
>          break;
>      case IFM_100_TX:
>          val |= AXEN_MEDIUM_PS;
> +        if (linkstat & (AXEN_USB_SS | AXEN_USB_HS))
> +            qctrl = 2;
> +        else
> +            qctrl = 3;
>          break;
>      case IFM_10_T:
> -        /* doesn't need to be handled */
> +    default:
> +        qctrl = 3;
>          break;
>      }
>  
>      DPRINTF(("axen_miibus_statchg: val=0x%x\n", val));
>      USETW(wval, val);
>      axen_lock_mii(sc);
> +    axen_cmd(sc, AXEN_CMD_MAC_SET_RXSR, 5, AXEN_RX_BULKIN_QCTRL,
> +        &axen_bulk_size[qctrl]);
>      err = axen_cmd(sc, AXEN_CMD_MAC_WRITE2, 2, AXEN_MEDIUM_STATUS, &wval);
>      axen_unlock_mii(sc);
>      if (err) {
> @@ -408,7 +440,6 @@ axen_ax88179_init(struct axen_softc *sc)
>      uWord        wval;
>      uByte        val;
>      u_int16_t     ctl, temp;
> -    struct axen_qctrl qctrl;
>  
>      axen_lock_mii(sc);
>  
> @@ -471,27 +502,12 @@ axen_ax88179_init(struct axen_softc *sc)
>      switch (val) {
>      case AXEN_USB_FS:
>          DPRINTF(("uplink: USB1.1\n"));
> -        qctrl.ctrl    = 0x07;
> -        qctrl.timer_low    = 0xcc;
> -        qctrl.timer_high= 0x4c;
> -        qctrl.bufsize    = AXEN_BUFSZ_LS - 1;
> -        qctrl.ifg    = 0x08;
>          break;
>      case AXEN_USB_HS:
>          DPRINTF(("uplink: USB2.0\n"));
> -        qctrl.ctrl    = 0x07;
> -        qctrl.timer_low    = 0x02;
> -        qctrl.timer_high= 0xa0;
> -        qctrl.bufsize    = AXEN_BUFSZ_HS - 1;
> -        qctrl.ifg    = 0xff;
>          break;
>      case AXEN_USB_SS:
>          DPRINTF(("uplink: USB3.0\n"));
> -        qctrl.ctrl    = 0x07;
> -        qctrl.timer_low    = 0x4f;
> -        qctrl.timer_high= 0x00;
> -        qctrl.bufsize    = AXEN_BUFSZ_SS - 1;
> -        qctrl.ifg    = 0xff;
>          break;
>      default:
>          printf("%s: unknown uplink bus:0x%02x\n",
> @@ -499,7 +515,6 @@ axen_ax88179_init(struct axen_softc *sc)
>          axen_unlock_mii(sc);
>          return;
>      }
> -    axen_cmd(sc, AXEN_CMD_MAC_SET_RXSR, 5, AXEN_RX_BULKIN_QCTRL, &qctrl);
>  
>      /* Set MAC address. */
>      axen_cmd(sc, AXEN_CMD_MAC_WRITE_ETHER, ETHER_ADDR_LEN,
> @@ -622,22 +637,8 @@ axen_attach(struct device *parent, struct device *self
>  
>      id = usbd_get_interface_descriptor(sc->axen_iface);
>  
> -    /* decide on what our bufsize will be */
> -    switch (sc->axen_udev->speed) {
> -    case USB_SPEED_FULL:
> -            sc->axen_bufsz = AXEN_BUFSZ_LS * 1024;
> -        break;
> -    case USB_SPEED_HIGH:
> -            sc->axen_bufsz = AXEN_BUFSZ_HS * 1024;
> -        break;
> -    case USB_SPEED_SUPER:
> -            sc->axen_bufsz = AXEN_BUFSZ_SS * 1024;
> -        break;
> -    default:
> -        printf("%s: not supported usb bus type", sc->axen_dev.dv_xname);
> -        return;
> -    }
> -       
> +    sc->axen_bufsz = 64 * 1024;
> +
>      /* Find endpoints. */
>      for (i = 0; i < id->bNumEndpoints; i++) {
>          ed = usbd_interface2endpoint_descriptor(sc->axen_iface, i);
> @@ -710,7 +711,8 @@ axen_attach(struct device *parent, struct device *self
>      mii->mii_flags = MIIF_AUTOTSLEEP;
>  
>      ifmedia_init(&mii->mii_media, 0, axen_ifmedia_upd, axen_ifmedia_sts);
> -    mii_attach(self, mii, 0xffffffff, MII_PHY_ANY, MII_OFFSET_ANY, 0);
> +    mii_attach(self, mii, 0xffffffff, MII_PHY_ANY, MII_OFFSET_ANY,
> +        MIIF_DOPAUSE);
>  
>      if (LIST_FIRST(&mii->mii_phys) == NULL) {
>          ifmedia_add(&mii->mii_media, IFM_ETHER | IFM_NONE, 0, NULL);
> @@ -808,6 +810,23 @@ axen_newbuf(void)
>      return m;
>  }
>  
> +static void *
> +axen_alloc_buffer(struct usbd_xfer *xfer, u_int32_t size)
> +{
> +    struct usbd_bus *bus = xfer->device->bus;
> +    usbd_status err;
> +
> +#ifdef DIAGNOSTIC
> +    if (xfer->rqflags & (URQ_DEV_DMABUF | URQ_AUTO_DMABUF))
> +        printf("axen_alloc_buffer: xfer already has a buffer\n");
> +#endif
> +    err = usb_allocmem(bus, size, 65536, &xfer->dmabuf);
> +    if (err)
> +        return (NULL);
> +    xfer->rqflags |= URQ_DEV_DMABUF;
> +    return (KERNADDR(&xfer->dmabuf, 0));
> +}
> +
>  int
>  axen_rx_list_init(struct axen_softc *sc)
>  {
> @@ -827,7 +846,7 @@ axen_rx_list_init(struct axen_softc *sc)
>              c->axen_xfer = usbd_alloc_xfer(sc->axen_udev);
>              if (c->axen_xfer == NULL)
>                  return ENOBUFS;
> -            c->axen_buf = usbd_alloc_buffer(c->axen_xfer,
> +            c->axen_buf = axen_alloc_buffer(c->axen_xfer,
>                  sc->axen_bufsz);
>              if (c->axen_buf == NULL) {
>                  usbd_free_xfer(c->axen_xfer);
> @@ -858,7 +877,7 @@ axen_tx_list_init(struct axen_softc *sc)
>              c->axen_xfer = usbd_alloc_xfer(sc->axen_udev);
>              if (c->axen_xfer == NULL)
>                  return ENOBUFS;
> -            c->axen_buf = usbd_alloc_buffer(c->axen_xfer,
> +            c->axen_buf = axen_alloc_buffer(c->axen_xfer,
>                  sc->axen_bufsz);
>              if (c->axen_buf == NULL) {
>                  usbd_free_xfer(c->axen_xfer);
> @@ -888,7 +907,6 @@ axen_rxeof(struct usbd_xfer *xfer, void *priv, usbd_st
>      u_int32_t        *hdr_p;
>      u_int16_t        hdr_offset, pkt_count;
>      size_t            pkt_len;
> -    size_t            temp;
>      int            s;
>  
>      DPRINTFN(10,("%s: %s: enter\n", sc->axen_dev.dv_xname,__func__));
> @@ -914,10 +932,19 @@ axen_rxeof(struct usbd_xfer *xfer, void *priv,
> usbd_st
>      usbd_get_xfer_status(xfer, NULL, NULL, &total_len, NULL);
>  
>      if (total_len < sizeof(pkt_hdr)) {
> +        printf("%s: rxeof: too short transfer\n",
> +            sc->axen_dev.dv_xname);
>          ifp->if_ierrors++;
>          goto done;
>      }
>  
> +    if (total_len > sc->axen_bufsz) {
> +        printf("%s: rxeof: too large transfer\n",
> +            sc->axen_dev.dv_xname);
> +        ifp->if_ierrors++;
> +        goto done;
> +    }
> +
>      /*
>       * buffer map
>       * [packet #0]...[packet #n][pkt hdr#0]..[pkt hdr#n][recv_hdr]
> @@ -928,16 +955,10 @@ axen_rxeof(struct usbd_xfer *xfer, void *priv,
> usbd_st
>      hdr_offset = (u_int16_t)(rx_hdr >> 16);
>      pkt_count  = (u_int16_t)(rx_hdr & 0xffff);
>  
> -    if (total_len > sc->axen_bufsz) {
> -        printf("%s: rxeof: too large transfer\n",
> -            sc->axen_dev.dv_xname);
> -        goto done;
> -    }
> -
>      /* sanity check */
>      if (hdr_offset > total_len) {
> -        ifp->if_ierrors++;
>          usbd_delay_ms(sc->axen_udev, 100);
> +        ifp->if_ierrors++;
>          goto done;
>      }
>  
> @@ -954,11 +975,14 @@ axen_rxeof(struct usbd_xfer *xfer, void *priv,
> usbd_st
>      if (pkt_count > AXEN_MAX_PACKED_PACKET) {
>          DPRINTF(("Too many packets (%d) in a transaction, discard.\n",
>              pkt_count));
> +        ifp->if_ierrors++;
>          goto done;
>      }
>  #endif
>  
> -    do {
> +    for (; pkt_count > 0; pkt_count--) {
> +        uint16_t csum_flags = 0;
> +
>          if ((buf[0] != 0xee) || (buf[1] != 0xee)){
>              printf("%s: invalid buffer(pkt#%d), continue\n",
>                  sc->axen_dev.dv_xname, pkt_count);
> @@ -972,34 +996,31 @@ axen_rxeof(struct usbd_xfer *xfer, void *priv,
> usbd_st
>          DPRINTFN(10,("rxeof: packet#%d, pkt_hdr 0x%08x, pkt_len %zu\n",
>             pkt_count, pkt_hdr, pkt_len));
>  
> +        if (pkt_len > MCLBYTES || pkt_len < ETHER_MIN_LEN) {
> +            printf("%s: invalid pkt_len %zu\n",
> +                sc->axen_dev.dv_xname,pkt_len);
> +            ifp->if_ierrors++;
> +            goto nextpkt;
> +        }
> +
>          if ((pkt_hdr & AXEN_RXHDR_CRC_ERR) ||
>                  (pkt_hdr & AXEN_RXHDR_DROP_ERR)) {
> -                ifp->if_ierrors++;
>              /* move to next pkt header */
>              DPRINTF(("crc err(pkt#%d)\n", pkt_count));
> +                ifp->if_ierrors++;
>              goto nextpkt;
>          }
>  
> -        /* process each packet */
> -        /* allocate mbuf */
> -        m = axen_newbuf();
> -        if (m == NULL) {
> -            ifp->if_ierrors++;
> -            goto nextpkt;
> -        }
> -
> -        /* skip pseudo header (2byte) and trailer padding (4Byte) */
> -        m->m_pkthdr.len = m->m_len = pkt_len - 6;
> -
>  #ifdef AXEN_TOE
>          /* cheksum err */
>          if ((pkt_hdr & AXEN_RXHDR_L3CSUM_ERR) ||
>              (pkt_hdr & AXEN_RXHDR_L4CSUM_ERR)) {
>              printf("%s: checksum err (pkt#%d)\n",
>                  sc->axen_dev.dv_xname, pkt_count);
> +            ifp->if_ierrors++;
>              goto nextpkt;
>          } else {
> -            m->m_pkthdr.csum_flags |= M_IPV4_CSUM_IN_OK;
> +            csum_flags |= M_IPV4_CSUM_IN_OK;
>          }
>  
>          int l4_type;
> @@ -1008,12 +1029,23 @@ axen_rxeof(struct usbd_xfer *xfer, void *priv,
> usbd_st
>  
>          if ((l4_type == AXEN_RXHDR_L4_TYPE_TCP) ||
>              (l4_type == AXEN_RXHDR_L4_TYPE_UDP))
> -            m->m_pkthdr.csum_flags |= M_TCP_CSUM_IN_OK |
> -                M_UDP_CSUM_IN_OK;
> +            csum_flags |= M_TCP_CSUM_IN_OK | M_UDP_CSUM_IN_OK;
>  #endif
>  
> -        memcpy(mtod(m, char *), buf + 2, pkt_len - 6);
> +        /* process each packet */
> +        /* allocate mbuf */
> +        m = axen_newbuf();
> +        if (m == NULL) {
> +            ifp->if_ierrors++;
> +            goto nextpkt;
> +        }
>  
> +        /* skip pseudo header (2byte) and trailer padding (4Byte) */
> +        m->m_pkthdr.len = m->m_len = pkt_len - 6;
> +        m->m_pkthdr.csum_flags |= csum_flags;
> +
> +        memcpy(mtod(m, char *), buf + 2, m->m_len);
> +
>          ml_enqueue(&ml, m);
>  
>  nextpkt:
> @@ -1022,11 +1054,9 @@ nextpkt:
>           * as each packet will be aligned 8byte boundary,
>           * need to fix up the start point of the buffer.
>           */
> -        temp = ((pkt_len + 7) & 0xfff8);
> -        buf = buf + temp;
> +        buf += roundup(pkt_len, 8);
>          hdr_p++;
> -        pkt_count--;
> -    } while( pkt_count > 0);
> +    }
>  
>  done:
>      /* push the packet up */
> 

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