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limits: 256 PCI functions, 128 sockets and devices, 64 USB interfaces

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The fixed tables that a bigger machine than the one they were written
on reaches first, each raised to where it costs little:

  NPCI       64 -> 256   a desktop with cards and Thunderbolt passes 64,
                         and the devices past it -- often the disk or
                         NIC last in bus order -- were ignored; 44 KB
  NSOCK      32 -> 128   Unix sockets, which a desktop session uses by
                         the dozen; 4.9 KB each, 470 KB in all
  NDEVICE    32 -> 128   120 bytes each
  NIFDEV     16 -> 64    one dock is a hub, Ethernet, audio and a card
                         reader at two or three interfaces apiece
  NETIF_MAX   4 -> 8

Device names took one digit and clamped there, so the tenth device of
a kind and every one after it was named "...9". Two digits now.

Checked under QEMU with two bridges of test devices: 68 functions,
all in lspci, /proc/pci and /sys/bus/pci.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
This commit is contained in:
Nexoniarz 2026-10-23 13:54:37 +02:00
commit 4805dbd892
6 changed files with 19 additions and 12 deletions
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10
kernel/dev/device.c
View file

@ -93,11 +93,13 @@ device_add(const char *base, enum dev_bus bus, enum dev_class class,
d->name[n] = base[n];
n++;
}
// Single digit is enough for NDEVICE of 32 per base name, and a two-digit
// path that is never taken is a two-digit path that is never tested.
// Two digits once there are ten of a kind. This clamped at 9, so the tenth
// and every later disk or interface of one kind were all called "...9".
if (idx > 99)
idx = 99;
if (idx > 9)
idx = 9;
d->name[n++] = (char)('0' + idx);
d->name[n++] = (char)('0' + idx / 10);
d->name[n++] = (char)('0' + idx % 10);
d->name[n] = '\0';
return d;

7
kernel/drivers/usb/core/usb.c
View file

@ -130,9 +130,10 @@ parse_config(struct usb_dev *dev, int nth)
}
// One usb_dev for every interface after the first. See `base` in
// include/usb.h. A fixed pool, like everything else here: sixteen is more
// interfaces than a desk of keyboards, mice and receivers adds up to.
#define NIFDEV 16
// include/usb.h. A fixed pool, like everything else here. It was sixteen,
// which a dock -- hub, Ethernet, audio, card reader, each two or three
// interfaces -- and a couple of receivers already reach. 672 bytes each.
#define NIFDEV 64
static struct usb_dev ifdevs[NIFDEV];
// ---------------------------------------------------------------------------