The advertisement written for a forced speed of 1G and above is 0x1001,
while auto and the forced 10M and 100M modes all carry bit 10, the PAUSE
capability. Forcing a port to 1g or faster therefore takes pause off the
link: the advertisement narrows and the far end has nothing left to
agree to.
Measured on a SWTGW218AS through phyget and physet, on a port with no
link so nothing was disturbed. Auto reads 0x15e1, port 1 1g reads
0x1001, port 1 auto reads 0x15e1 again, and writing 0x1401 by hand
sticks. That bit 10 is the pause capability follows from a second
reading: two ports advertise the same 0x15e1 from this side, and pause
is active only against the partner whose own advertisement carries the
bit.
Reported by feelfree69 in #489.
Two per-port MAC status registers that nothing in the firmware reads:
0x6408 says which end is master on a BASE-T link, 0x63FC and 0x6400 say
whether pause was negotiated in each direction. port <n> show prints
both at the end.
The read sits in rtl837x_port.c rather than phy_show(), because these
are MAC registers and phy_show() is skipped for SFP ports. Master/slave
keys off machine.is_sfp[] so it stays off the fibre ports, where the
notion does not apply.
Bit N of each register is chip port N, which is not how
RTL837X_REG_LINKS_STS indexes its bytes a few lines above in the same
header.
edc469f made max_upload count, which bounds how many bytes a request may
carry. Nothing bounds where those bytes land. The two are not the same
check: the first watches the request, the second watches the flash address.
uptr walks forward one page at a time from FIRMWARE_UPLOAD_START and has no
ceiling. A body whose closing boundary never arrives keeps writing page after
page past the staging region, and on a flash exactly twice FIRMWARE_UPLOAD_START
the address wraps onto the running image at zero, so a bad upload takes the
working firmware with it. That commit's own message notes the related hazard:
flash_write_bytes() carries the address in three bytes and drops what does not
fit.
Bound it where uptr actually moves: refuse the next page once it would leave
the area check_and_flash_update_image() reads back, and answer 400. A partial
image left behind is harmless - boot rejects it on CRC and erases it.
This rebase drops the part of the original patch that removed max_upload;
the length limit and the address limit now sit side by side.
The counters, the phase hooks in idle() and the "health" command are now
behind HEALTH, set from the command line with HEALTH=1. Without it the
hooks are empty macros and the command does not exist, so a default build
carries none of it: on SWTGW218AS that is 1065 bytes of bank 2, 101 of the
common segment and 28 of xdata, plus seven banked calls per main-loop pass.
It is a developer's tool. Reading the dump takes knowing the main loop, and
a user who needs it for a report can build with the flag on, which is how
the kernel treats its lock and latency instrumentation as well.
The tcp slot dump printed the slot index behind `if (UIP_CONNS > 1)`, and
with one connection configured that is a constant-false condition around
live code: sdcc reported two "unreachable code" warnings for the body and
one "conditional flow changed by optimizer" for the loop that could only
run once.
Print the single slot directly and state the assumption as a build-time
check, so a build that raises UIP_CONNS fails loudly here instead of
quietly labelling every line as slot zero. Builds warning-free again.
What each line of the dump means, how two dumps give rates, and the
two things worth knowing before trusting the numbers: the command
inflates its own cmd phase counters by the cost of printing, and the
untouched figure is a high-water mark, not a live level.
Every probe of a misbehaving switch so far measured it from the
outside. This puts the witnesses inside.
Each idle() pass increments a loop counter and stamps a checkpoint
after every phase: link polling, SFP, RX, TX, STP and the command
dispatch. A phase spanning two or more system ticks counts as slow and
its worst time is kept, in 5 ms units. handle_rx counts frames, so the
dump separates a flooded CPU from a stalled loop.
At boot the free stack area is painted, preserving the interrupt state
around the painting, and the dump reports how much of the pattern
survives next to the live stack pointer. The TCP connection table is
printed whole: state, timers, retransmissions, ports and peer, next to
the httpd transfer state, so a permanently occupied slot names its
occupant. With more than one slot configured every slot is listed.
Everything is raw hex; two dumps a known time apart give the rates.
The implementation sits in cmd_parser next to the other command
handlers and needs no storage beyond its counters.
handle_sfp() called sfp_module_read() as soon as it saw a module appear, and
that path opened with delay(100). delay() spins on PCON until the tick counter
runs down, so the main loop stood still for 100 ticks - half a second at
SYS_TICK_HZ 200. Nothing else ran in that window: no STP, no LACP, no packet
handling. A diagnostic build measured the sfp phase at up to 107 ticks, the
longest stall of any phase in the loop.
Remember when the module showed up and let the loop continue. The I2C read
happens on a later pass, once the wake-up period has elapsed. Pulling a module
cancels a pending read, and a failed read still restores the detect bit, so the
existing retry-on-the-next-poll behaviour is unchanged.
The comparison is written out rather than using a helper so that this does not
depend on anything outside the current tree. The pending flag is an array
indexed by slot, like the other per-slot state in this file.
Cost on SWTGW218AS, measured against the branch point: BANK3 11173 -> 11264,
CSEG, BANK1 and BANK2 unchanged, plus 4 bytes of xdata.
idle() went to sleep before it looked at the receive buffer, so a packet that
arrived just after the loop dozed off waited for the next tick before anything
touched it. Every TCP round-trip paid that toll, which is why the web UI felt
sluggish even though no phase of the loop was anywhere near busy.
Check the receive buffer first and only sleep when it is empty. The read takes
its result straight from SFR_DATA_U16 rather than going through reg_read_m()
and the sfr_data[] copy, which is what the rest of the tree already does.
Measured on SWTGW218AS with this change alone:
web UI, median of 15 requests for the main page 88 ms -> 76 ms
CPU port under a one-way UDP stream 159 -> 230 packets/s
The loop still sleeps normally when there is nothing to do, so this does not
turn the core into a busy-wait: loops/ticks stays at 0.99 on an idle switch,
and rises above 1.0 only while packets are actually queued.
Costs 12 bytes of code and no extra XDATA.
handle_rx() picked up exactly one packet per iteration of the main loop. Since
the loop sleeps until the next tick, that capped the CPU port at roughly one
packet per tick no matter how little work it had to do. A burst of broadcast,
ARP or IGMP traffic aimed at the CPU queued up behind that and pushed out the
STP and LACP timers.
Drain up to RX_BUDGET packets in one pass instead. The budget matters: without
one a sustained flood would spin here and starve everything else in the loop.
The two register reads in the loop take their result straight from
SFR_DATA_U16 rather than going through reg_read_m() and the sfr_data[] copy,
which is what the rest of the tree already does.
Measured on SWTGW218AS with a one-way UDP stream, counting the packets the CPU
actually processed, with this change alone:
before 159 packets/s
RX_BUDGET 4 245 packets/s, loop iteration ~16 ms
RX_BUDGET 8 298 packets/s, loop iteration ~26 ms
Throughput is already most of the way there at 4, so the larger budget mostly
buys a longer worst-case delay for the other phases. STP stayed responsive in
both cases.
Costs 71 bytes of code and no extra XDATA.
The TODO next to the disabled TCP checksum code asks which bit of the RX tag
carries the result. It is bit 2 of byte 1: the hardware sets it when the L4
checksum is bad.
That answers the question for UDP as well, which was not being checked either
because UIP_CONF_UDP_CHECKSUMS is 0. Both paths now read the flag instead of
running a checksum over the payload on the 8051.
A zero UDP checksum, which is optional in IPv4, is not flagged by the hardware,
so DHCP keeps working and no extra condition is needed.
rx_headers lives in rtlplayground.c, which the host tests do not link, so
test_httpd_tx carries the storage itself the way it already carries uip_buf.
A zeroed descriptor reads as a good checksum, so the existing scenarios are
unaffected.
A new scenario sets the flag on a request and expects it counted as a checksum
error and left unanswered, then sends the same request with the flag clear and
expects it served. Built against uip.c without this change, those first two
checks fail and the two control checks still pass, so the scenario tells the
two versions apart rather than merely exercising the code.
Costs 156 bytes of code on SWTGW218AS and no extra XDATA.
The helper landed between that comment and the function it describes, so the
comment now reads as if it belonged to name_char(). Moving the helper up puts
the two back together. The generated code is unchanged.
gcc flags the else whose only statement is dbg_string(), because that macro
expands to nothing unless DEBUG is on, leaving the branch with an empty body.
The line is older than this branch; the bench is simply the first thing that
compiles httpd.c with a host compiler and -Wall -Wextra.
Turn warnings into errors in the test Makefile too, so the next one is caught
where it appears instead of scrolling past. It is the only warning the four
test binaries produce, so nothing else has to change.
The replay takes a line of at most 126 bytes, so a longer one is skipped
on boot. Neither the upload path nor the editor looked at line length,
so the file the user saved was not the configuration the switch would
come up with.
Reject such a body in config_take(), before the sector is erased, which
the upload path already maps to 400. The editor points at the offending
line and its length, and measures it in bytes rather than characters, so
a name written in a non-ASCII script is counted the way the switch
counts it.
execute_config() replays the saved configuration line by line into
cmd_buffer. A line that does not fit, or one cmd_tokenize() rejects,
ended the replay right there: everything below it was silently left
unapplied, while the file itself and the editor showing it stayed
complete. On a switch here, a 130-byte line placed after the last real
setting was enough to lose every line that followed it on the next boot.
Report the offending line and carry on with the next one. The skip flag
lives across the flash page refill, so a long line that crosses a page
boundary is not resumed halfway and run as a truncated command.
Drives the unmodified httpd.c and uip.c through a handshake and a GET
from a client that moves its receive window, and compares the bytes that
reach the wire with the file they are meant to carry. The served file
holds a position-dependent pattern, so a repeat or a gap is reported at
its offset rather than as content that differs somewhere.
The first scenario holds the window still and must pass: it is the check
that the bench itself is sound, before the two moving-window scenarios
are believed.
uip_mss() is the limit on the next segment, not a record of the last
one: uIP recomputes it from the window the peer advertises in every
incoming segment, before the application is called. The ACK path
subtracted it from slen and added it to o_idx, and the retransmit path
handed it to uip_send(), so whenever the window moved between a segment
going out and its ACK coming back, the file being served lost or
repeated the difference. A window shrinking from 1460 to 600 between the
two repeats 860 bytes under fresh sequence numbers, which a browser
writes into the file; a window opening the same way skips 860.
Remember the length in tx_send() and use it in both places. The
retransmit path then repeats exactly the segment uIP still counts as
outstanding, which is what uip_connr->len makes it put on the wire.
uip_appdata is void *, so p - uip_appdata subtracts pointers of
different types. SDCC accepts it, C does not, and no host compiler will
build the file for a unit test. Cast to the type the byte count is meant
in; the generated firmware code is unchanged.
The vendor, model and serial strings are filtered while the EEPROM read
fills the buffers, so the page copies them out as they are. NUL still
ends a string, so a field shorter than its slot reads the same as before.
The three loops in send_status() become one call each. strcpy() cannot
return the length: rtl837x_common.h hides that prototype under
RTLP_HOST_TEST so host builds take the C library version, and a call
that adds its result to slen does not compile there. A small static
helper does the copy instead, and bank 1 drops by 96 bytes.
The console, POST /cmd and the saved config all go through the command
parser, so one filter there covers every way a name can be set. The
hostname already did this inline; port and VLAN names now do it too.
The SFP strings still need escaping on the way out: they come from the
module's EEPROM, not from a command.
A port named NAS"1 made status.json unparsable, so the page stopped
loading, and the name survives a reboot in the saved config. VLAN names
and the SFP strings have the same problem.
They now go through a helper that replaces ", \ and non-printable bytes
with a dot, the way the hostname is already sanitized on ingest. The
length does not change, so the size checks still hold.
The helper also covers the 0xa0 byte that send_sfp_info() skipped as a
special case, so that check is gone.
Compiling these two files for the host turns up warnings that SDCC does
not print: four places mix & with | and two mix && with ||, and l2_delete
keeps a counter it never reads. The parentheses only say what the
compiler already does, so the generated code is unchanged.
counter_to_html() reads the SFRs directly for the zero test, which saves
14 bytes of bank 1.
page_impl.c and rtl837x_port.c are linked together over the simulated
engine, so /vlan.json, /vlanlist and /l2.json are checked against what
vlan_create, pvid and the L2 table hold, through the same bytes the switch
would. The L2 walk is driven the way the web page drives it, page after
page until an index repeats, which is also where the repeat of the first
entry is pinned down as the wrap marker the page relies on. The counter
test fails on the code before the previous commit.
send_status wrote the high and the low word of a packet counter one after
the other, each without its leading zeros. That reads fine until a port
passes four billion packets; from then on a low word of 5 prints as "0x15"
next to a high word of 1, and the rates the page derives from the
difference between two readings jump around. send_counters already padded
the low word, so both now share one helper that pads it only when the high
word is set, which also drops the leading "0" the counters page used to
print in front of every small value.
The switch is reached through four register functions and the SFR_DATA
registers, so a flat register file behind them is enough to run the table
code on the host. A few addresses are live: writing TBL_CTRL with EXECUTE
performs the VLAN or L2 operation at once and clears the bit, STAT_GET
fetches a counter, L2_TBL_FLUSH_CTRL drops entries. Nothing ever reports
busy, so a polling loop runs once and the tests say nothing about what
happens when hardware stalls; that question was settled elsewhere.
The header states the VLAN and L2 entry layouts on its own, so a test can
hold what rtl837x_port.c writes against a second reading of the same bits
rather than against itself. The first suite does that for the VLAN entry,
the PVID register two ports share, the static multicast and management
entries, the per-port flush and the trunk registers. Two stub headers stand
in for the ones a firmware build generates, so the harness needs no SDCC
build first.
Two things kept every register-driven module out of the host harness. The
SFR keywords were unknown, so rtl837x_sfr.h did not compile at all, and once
it did, each translation unit would have defined its own copy of the
registers. They map to extern declarations now; a mock emits the storage
once by re-including the header with the keywords redefined.
The other was memset. rtl837x_common.h hides the firmware's own prototypes
under RTLP_HOST_TEST so host builds use the C library, but nothing declared
the library versions, and the modules do call them. The shim pulls in
string.h ahead of everything, where nothing can clash with it.
The messages said Error: themselves, or usage:, or nothing at all.
cmd_error() prints the prefix now, so every rejected command answers the
same way and the strings only carry what is specific to them.
Two messages that started with Error or refusing are reworded so the
prefix does not read twice. The syslog usage text becomes one string
instead of three calls.
run_cmd_body() answers POST /cmd with 400 when err_status is set, but
only the tokenizer set it. Every "Error:", "Invalid ..." and "Unknown
command" from the parsers went back as 200, so the web page reported the
command as applied, and save_cmd put the rejected line into the command
history, from where Save to flash wrote it into the startup config.
Set ERR_INVALID_ARGUMENT on every path that rejects a command: the err:
labels of the parsers, the parsers that print their own error, the
stp parser and the unknown command fallback. Warnings that still apply
the command, such as a full VLAN name table, are left alone.
Record a command in the history only when it was accepted, and let
execute_commands() report the first failure of a multi-line body, since
cmd_tokenize() clears err_status again for every following line.
Save to flash ran the stored config through the same filter as the
command log, so stored lines the page does not know were dropped. The
stored lines are now carried over as they are and only the log is
filtered.
ingress only changes the ports it lists, but the merge replaced every
stored ingress line. It now merges per port; "ingress t|u|a" still
replaces everything, and per-port settings an all-ports line already
overrode are not revived.
Write from the config editor no longer clears the command log or the
unsaved marker, since the edited text does not hold the changes made on
other pages; only Save, which merges them, clears the log.
The command log grows from 1 kB to 2 kB, which still fits the 2500 byte
output buffer, and send_cmd_log() stops at the end of that buffer.
The workflow only ran on push, so a pull request opened from a fork
never got a build, and neither did the host-side unit tests that run in
the same job.
handle_post() takes the request path from byte 6 of the segment it is
given. For the first segment of a POST that is the path, but for a later
segment of a multipart upload it is whatever part of the file happens to
sit there. The cmd and login handlers were matched before the multipart
state was checked, so a segment of a config or firmware upload with
"cmd " at that offset ran the rest of the segment as CLI commands, and
one with "login " there aborted the upload with 400.
Check for an upload in progress, and for new upload and config requests,
before looking at cmd and login. A new POST cannot match both sets of
words, so nothing changes for requests that are not uploads.
session_id is cleared at boot and only a successful login fills it in,
while the uptime counter and last_session_use both start at 0. For the
first SESSION_TIMEOUT seconds after a start, a request carrying an empty
"Cookie: session=" therefore passes is_word_x(session, session_id) and
is treated as logged in, which is enough for /cmd, /config and /upload.
Only look at the cookie once a session has been handed out.
flash_read_security() ends its loop the same way flash_read_bulk() did
before the previous commit: only through comparisons with 1, 2, 3 and 4. A length of
zero matches none of them, the following subtraction wraps on uint16_t
and the loop keeps printing until the counter comes back down to 4.
No caller passes zero today, since the only one is the CLI with a
constant length of 40, but the bound belongs in the function rather
than in whoever calls it.
flash_read_bulk() ends its copy loop only through the comparisons
len == 1|2|3|4, so a length of zero matches none of them. The
following len -= 4 wraps on uint16_t to 65532 and reaches 4 only
after 16384 iterations, writing 65536 bytes to the destination and
overwriting the whole XDATA space.
send_config() gets there with valid_len 0 whenever the stored
configuration begins with a NUL byte, which is the state left by
uploading an empty configuration file. Every later request for the
configuration page then clears the management VLAN and the STP
flag and replaces the host address, while the switch keeps running
and keeps forwarding traffic.
The 8051 in the RTL837x has 48 kB of XDATA, 0x0000 to 0xBFFF. Writing
a byte and reading it back from the same address works all the way up
to 0xBFFF on a SWTGW218AS, while at 0xC000 the byte comes back as 0x00.
Without --xram-size the linker assumes 16 MB, so running past the end
would still build cleanly and only show up at run time.
The value is 49151 rather than 49152. The linker check adds up the
sizes of the XDATA areas, and XDATA allocation starts at 0x0001, so a
limit of 49152 would still let the last byte land on 0xC000.
boot.c calls it from BANK3 and only rtlplayground.c had a prototype, so
the compiler saw an implicit declaration. The call itself was fine, the
function lives in the common area, but the warning was real. Move the
prototype into the shared header.
Reported by vDorst.
sfp.c takes handle_sfp, sfp_module_read, sfp_apply_quirks, sfp_get_info,
sfp_read_field, sfp_print_info, setup_sfp_gpio, the quirk table and the module
state that goes with them. Everything exported is __banked: handle_sfp() and
sfp_print_info() are reached from cmd_parser.c in BANK2, the rest from the
common area, and both are bank boundaries.
The quirk table needed checking rather than assuming. Its entries are __code
pointers, and a __code pointer carries no bank, so passing one to a function in
a different bank hands it an offset read through the wrong window. That is safe
here because strcmp() sits in the common segment at 0x51f and is reached with a
plain lcall, so the bank register still says 3 while it runs. Verified in the
built image: the table at 0x35580 holds 0x563c and 0x5644, which resolve to
"QSFPTEK" and "QT-SFP+-T" inside BANK3.
Common segment 13393 -> 8432 bytes, leaving 7492 free rather than 2531. BANK3
holds 5710, BANK1 is unchanged and BANK2 grows by 31 for the trampolines.
All 34 machines in machine.h build and link, and the same walk over the
generated assembly finds no plain lcall crossing a bank boundary.
The common segment is the scarce one: sixteen kilobytes shared by every bank,
and before this it had about 2.5 kB left. Most of what moves here runs once at
startup and does not have to sit in it. The two SerDes helpers are the
exception: the link-change handler and the SFP polling both reach sds_config()
while the switch is running, so they are not startup-only. None of it is
reached from an interrupt.
boot.c takes setup_i2c, init_smi, nic_setup, rtl8373_revision, rtl8224_enable,
early_boot_handle_button, set_hostname_default and the two SerDes helpers.
BANK3 is enabled with the linker flag; nothing else in the build needed
changing.
Everything moved is declared __banked, since every caller is outside BANK3:
main() and friends run from the common area and rtl837x_init.c calls
sds_config() and sds_config_mac() from BANK2. The calls the moved code makes
outward were already banked, so that side needed no work.
Common segment 13393 -> 10137 bytes, leaving 5787 free rather than 2531.
BANK3 holds 3732. All 34 machines in machine.h build and link. Walking
the generated assembly for plain lcalls that cross a bank boundary finds none
among 2808 calls; those build cleanly and only fail at run time, so it seemed
worth checking by machine rather than by eye.
IPBUF is laid out for frames we send, with the 12 byte TX descriptor in
front of the Ethernet header. A received frame starts with the Ethernet
header at uip_buf[0] and carries the RTL and VLAN tags after the
addresses, so IPBUF->ethhdr.src read the port mask and both VLAN fields
as a MAC. Every IP packet from the local network then replaced the
sender's ARP entry with that, and our replies went to an address nobody
has. The IP source address sits at the same offset in both layouts,
which is why the rest looked right.
Use BUF, the receive view uip_arp_arpin() already works from.
The state literals were spread over eighteen places in the file, sixteen
of them older than this branch, so naming only the new ones would have
left it written half one way and half the other.
Naming them separates two roles the literal hid: 0b11 is the forwarding
state in a call and a two bit field mask in a read-modify-write, hence
both STP_ST_FORWARDING and STP_ST_MASK. The comment above stp_state_set()
said what the defines now say, so it goes.
stp_parse() holds an entity index, not a port. cmd_parse_port() has
already mapped the front panel digit through machine.phys_to_log_port[],
and the aggregates continue that same logical range above the CPU port,
so call the variable ent. Reading the two branches of the if no longer
means following the parser two functions down.
No change to the generated code: 5331 instructions before and after.
The web UI became one index.html plus one main.js while this branch was
open, so the STP page changes had no html/stp.js and html/config.js left to
live in. They are re-applied here against the new structure.
A row now carries two derived fields: the name the CLI expects for it
("port N" or "lag N") and the key its controls are keyed by (the port
number or "LN"). A group's row is labelled with its front panel members,
which /stp.json reports in the mbr field.
conf_cmds and conf_overwrite accept the "stp lag N ..." forms so the
startup config keeps them.
Review of #397 pointed at the bare 10, which shows up in fifteen places. It
is the width of the port field in the MSTP register, so it is the CPU port
index plus one and it gets a name.
The web page counted to ten as well when listing a group's members. It uses
numPorts now, like the rest of that page does.
The aggregation section of the doc no longer names the OEM firmware or calls
a group a trunk, and it says plainly that the hardware keeps no per-group
state, so the firmware writes the members itself.
Generated code is unchanged: the only difference in the assembly is the
version string.
Spanning tree so far saw only physical ports. Two ports aggregated towards
the same neighbour look to the protocol like two parallel paths, so it
blocks one of them and cuts the group in half.
Give each of the four groups an STP entity of its own, numbered above the
physical ports. A member port answers to its group: BPDUs arriving on it
are accounted to the entity, the entity's state is written to every member
together, and its BPDUs carry the state of a live member. Ports outside
any group keep behaving exactly as before.
Membership comes from the aggregation tables once a second; when it
changed, the entity's state is reapplied to the new set of members. The
CLI takes lag <1-4> wherever it takes port <n>, the web UI shows a group
as one row, and the saved config keeps the lag form of the commands.
The lookup tables live in BANK1, so the routine switches the code bank to
reach them with movc and never switches it back. That is the contract the
__naked declaration already implied: same bank or common segment only.
The name now says it.
crc16_bank1 is the routine unchanged. crc16 becomes a __banked wrapper in
BANK1, so a caller from another bank has its own bank put back by
__sdcc_banked_ret. The two existing call sites take the direct path and
pay nothing.
A VLAN name is copied into vlan_names with nothing checking vlan_ptr
against VLAN_NAMES_SIZE. The only limit is the 128 byte command line, so
enough named VLANs walk straight off the end of a 1 kB table.
What sits immediately behind it makes this worse than a plain overflow: at
0x048A comes vlan_ptr itself, the index driving the write, then port_names
and cmd_buffer. Once the index is corrupted the following writes land
wherever it now points, and the configuration is replayed at boot, so a
config file that overflows does it again on every start.
Measure the name first and refuse it if the three id digits, the name, its
separating space and the terminator would not fit. The check goes before
vlan_name_remove() so a name that does not fit cannot take the existing one
with it, and the VLAN still gets its ports: dropping the whole line would
lose port membership during a config replay, which is worse than losing a
name.
The copy walks a pointer instead of indexing vlan_names[vlan_ptr++] each time,
and the word offset comes out of cmd_words_b once. Writing the bound as
VLAN_NAMES_SIZE - 5 folds the constant at compile time instead of adding it on
every call. BANK2 ends up 25 bytes smaller than it was before the check
existed.
The RTL tag carries a 4-bit port number for received frames, and the two
places that turn it into a mask bit take the whole byte:
entry.pmask |= (1L << (IGMP_I->rtl_tag.pmask >> 8));
The comment beside it already says only the low four bits count, but nothing
takes them. rtl837x_stp.c:424 does the same extraction and does mask:
stp_scratch = ((uint8_t)HTONS(STP_I->rtl_tag.pmask)) & 0x0f;
With a count above 15 the result is not a bit at all. SDCC narrows the 1L to
16 bits and emits the shift as a djnz loop, so a count of 200 spins the loop
200 times and leaves zero behind: the join adds no port and the leave clears
none, neither saying anything. It also spends those iterations inside packet
handling.
Mask to four bits and shift a uint16_t, which is the width the surrounding
code works in. Six bytes of BANK1.
Worth saying that this does not make snooping work on its own. struct
igmp_pkt has no vlan_tag field while struct eth_in describes the same frame
with one, so every IP and IGMP field below rtl_tag is read four bytes early.
The 100M branch of phy_set_speed() was missing an else. A port set to 100M
half wrote 0x1481, walked into the next if, found duplex was not 1, took its
else and overwrote the register with 0x1581 straight away, so it advertised
100BASE-TX half and full both. That is what asking for both is meant to do,
and forcing half is something people do to match a partner that cannot
negotiate, so the link comes up looking fine and misbehaves under load.
Bit 7 is 100BASE-TX half and bit 8 is full, which makes 0x1481, 0x1501 and
0x1581 half, full and both, the same shape as 0x1421, 0x1441 and 0x1461 in
the 10M branch above.
Both branches now choose the advertisement into a variable and write it once,
and they compare against the PHY_DUPLEX_* names instead of 0, 1 and whatever
is left. Same values reach the PHY; BANK2 loses 92 bytes.
The 100M branch of phy_set_speed() is missing an else. A port set to 100M
half writes 0x1481, falls into the next if, finds duplex is not 1 and takes
its else, and immediately overwrites the register with 0x1581. The port
ends up advertising 100BASE-TX half and full, which is what "both" is
supposed to mean.
The 10M branch directly above has the chain the 100M one meant to have, and
the values line up with it: bit 7 is 100BASE-TX half, bit 8 is full, so
0x1481, 0x1501 and 0x1581 are half, full and both, exactly as 0x1421,
0x1441 and 0x1461 are for 10M.
Forcing half duplex is something people do to match a link partner that
cannot negotiate, so quietly advertising full as well is the wrong way for
this to fail.
Not tried on hardware: every port on the switch here has a link up, and
setting the speed restarts negotiation.
isr_ext2() ends with PCON |= 1, putting the core to sleep from inside an
interrupt handler.
The DW8051 leaves idle when any enabled interrupt is activated, so the core
does not stay down for long. It naps until the next enabled interrupt request
turns up, with the 200 Hz system tick putting a ceiling of 5 ms on that, and
then carries on.
The sleep buys nothing either way, because the instruction after it is the
return. While it lasts the handler holds the priority latch, so everything at
its level or below waits, and that includes the tick, the console and the NIC
receive interrupt.
The handler still clears its flag, which is what it has to do. The bit numbers
beside the two masks were wrong: 0xef clears bit 4 and 0xdf clears bit 5,
not 7 and 6.
isr_ext2() ends with PCON |= 1, putting the core to sleep from inside an
interrupt handler.
The DW8051 leaves idle when any enabled interrupt is activated, so the core
does not stay down for long. It naps until the next enabled interrupt request
turns up, with the 200 Hz system tick putting a ceiling of 5 ms on that, and
then carries on.
The sleep buys nothing either way, because the instruction after it is the
return. While it lasts the handler holds the priority latch, so everything at
its level or below waits, and that includes the tick, the console and the NIC
receive interrupt.
The handler still clears its flag, which is what it has to do. The two wrong
comments next to the masks go as well: 0xef clears bit 4 and 0xdf clears bit 5,
not 7 and 6, and the masks already say that without help.
isr_ext2() ends with PCON |= 1. On the DW8051 any enabled interrupt request
ends idle, so the handler sleeps until the next request arrives, the system
tick at the latest, and only then returns. Everything at the same priority
waits with it, and the instruction after the idle is RETI, so the sleep buys
nothing.
The handler still clears its flag, which is what it has to do. The other four
uses of PCON |= 1 are in task context and are left alone.
A file larger than the output buffer is sent in two phases: the first
buffer goes out in MSS-sized pieces, with o_idx walking through it, and
what is left is then streamed from flash a chunk at a time into outbuf
from offset 0.
The continuation branch never reset o_idx, so it kept the offset the first
phase had left it at, while uip_rexmit() retransmits from outbuf + o_idx.
A lost continuation segment was therefore retransmitted as the bytes 1460
further into the buffer, which the client accepts as the missing data, and
with o_idx + slen past the 2500-byte buffer it also read whatever xdata
follows outbuf.
Reproduced on a SWTGW218AS by dropping 15% of the switch's TCP segments:
seven of eight fetches of a 21 kB static came back the right length and
the wrong content, each first differing at a fixed phase of the 1460-byte
chunk. With o_idx reset the retransmission repeats the chunk it sent.
The o_idx += slen right after slen = 0 went too: it added nothing.
(cherry picked from commit 789d29423288f89411a41673e26ce1854b296c3d)
uip_arp_ipin() is an empty macro with its body under #if 0, both inherited
from the uIP import and untouched since. That leaves uip_arp_update()
reachable only from uip_arp_arpin(), so an entry is refreshed only by ARP
addressed to us and ages out after UIP_ARP_MAXAGE no matter how much traffic
passed over it.
When it goes, the next transmission to that host hits the miss path of
uip_arp_out(), which overwrites the packet in uip_buf with an ARP request and
returns. For TCP that costs a retransmission. For UDP nothing retransmits, and
handle_tx() sends the UDP connections through uip_arp_out() too, so the
datagram is lost.
The body could not be enabled as written: uip_len -= sizeof(struct uip_eth_hdr)
is a leftover from when UIP_LLH_LEN was 0. Here it is ETHER_HEADER_SIZE +
RTL_FRAME_DESC_SIZE and uip.c reads the IP header at uip_buf[UIP_LLH_LEN], so
uip_len has to keep the link layer in it. The rest of the function is sound.
replaceCalls() ended with strlen(&buffer[pos]), so the length recorded for a
file was the distance to its first 0x00 byte rather than the file size. The
byte just past the content happens to be zero today, which is the only reason
the numbers come out right.
Nothing in html/ contains a 0x00 today, so this is latent, but it is a trap
waiting for the first gzipped or binary asset: gzip puts a zero in the fourth
byte of its header. A gzipped style.css lands in the index as 3 bytes, and
since addr advances by that same value the next file is placed 3 bytes in and
overwrites what came before it. Two gzipped files in html/ are enough to see
it: both come out as 3 bytes and the second sits 1356 bytes inside the first.
Pass the length in and return the adjusted one. The substitution shortens
#{function} to #{NNN}, so the delta is known without measuring. The loops are
bounded by the length as well, which also covers -n, where nothing had put a
terminator in the buffer for strlen to find in the first place.
No output change: the image built from an unmodified html/ is byte for byte
the same before and after, and html_data.h is identical.
Option 58 is optional, and dhcp_state.renewal is only ever written by
parse_opts(), so a server that leaves it out keeps it at zero. The ACK
handler then sets dhcp_timer to zero, and the callback treats a zero timer
in LEASING as time to renew, so it sends a REQUEST on the next pass.
That REQUEST does set a 30 second timeout, but the ACK that answers it
comes back through the same path and zeroes the timer again, so the two
sides trade REQUEST and ACK as fast as the round trip allows, with the
console printing the whole lease each time round.
RFC 2131 has the client renew at half the lease when the server does not
say, so use that, and fall back to a fixed value if there is no lease
either. Both only fill in a value that is missing: a server that asks for a
short renewal still gets exactly what it asked for, which a blanket lower
bound would have overridden.
Not reproduced here, that needs a server configured without the option.
write_char() masked writeptr and never looked at readptr, so once more
than LOGBUF_SIZE bytes were written between two drains the ring wrapped
over content that had not been sent yet.
That is not a corner case. The ring is emptied once per main loop pass,
while a single command runs to completion inside one pass, and a full L2
listing prints well over twice the 512 byte buffer. On hardware the whole
1227 byte dump came out as one 174 byte datagram whose first line began in
the middle of a MAC address.
Drop the character when the ring is full instead of overwriting, so what
has been logged stays intact and it is the tail that is lost. A full ring
also flags a line, otherwise a burst without a newline would leave the
reader waiting on line_available forever and syslog would stop for good.
dhcp_start() never looked at whether DHCP was already running, and "ip dhcp"
calls it without stopping first, so a second start took a fresh slot from
uip_udp_conns and left the previous one bound.
The leak is the smaller half of it. dhcp_callback() decides whether a call
is for it by comparing the local port, not the connection, and every
leftover socket still holds port 68, so each one runs the state machine on
every poll. The timers live in one shared dhcp_state, so ticks count down
once per socket: two starts and the retransmit and renewal timing runs at
twice the intended rate.
Stop the old one first. dhcp_stop() already does exactly that, and the
state test keeps it away from a connection that was never created.
uip_init() does not set uip_conn, and httpd_init() runs right after it, so
the assignment went through a pointer nothing had assigned yet.
It has stayed invisible because the startup code does clear xdata: uip_conn
is NULL rather than garbage, appstate sits 28 bytes into struct uip_conn, and
the byte therefore lands at xdata 0x1C. With the current map that is inside
the command line buffer, at an offset nothing reads while the line is empty,
and cmd_editor_init() runs later anyway.
Nothing is broken today, but it is a write to an address that has nothing to
do with the state being set, and it moves the moment the struct grows or the
map shifts. Address the connection directly.
Leaving SFP ports out of the table is deliberate for now, and being able to
force a module's speed belongs in a feature of its own rather than arriving
inside a fix, so that half goes again.
What remains is the off-by-one: createPortTable() read pState[i] where the
array is filled by portNum - 1, so every row started out showing the next
port's link speed until the first refresh corrected it. The debug line above
it goes too; it printed a third index, pState[i-2].
The id was built and checked with HTONS(), which casts to 16 bits, so the
top half of the 32-bit transaction id was thrown away and the rest byte
swapped. The id is opaque: the client only has to receive its own value
back, so there is no byte order to honour and no reason to narrow it.
Assign and compare the field directly, so the full 32-bit id round-trips.
Fold the "group with no ports" case into the argument-count guard
(cmd_words_len < 3) instead of a separate check, and accept only "d" for
delete, dropping the longer "delete" spelling. Update the serial-console
docs to match.
The EX0..EX3 handlers each emitted a single debug character through
write_char(), which busy-waits on the serial TX-empty flag that is set by
the serial interrupt. If one of these handlers runs while a byte is being
transmitted, it waits for a flag that the equal-or-lower-priority serial
interrupt cannot deliver, hanging the handler with the system tick stopped.
The characters were only ever debug markers, so drop them; the handlers now
just acknowledge the interrupt. No interrupt service routine should call the
blocking console path.
uip_arp_timer() was defined but never called, so ARP entries were only
refreshed on new learning and only removed under table pressure. A cached
entry for a peer whose MAC later changes (a gateway failover, a replaced
device) is then used until it is evicted, and traffic to anything reached
through it is sent to the old MAC and lost, while on-link traffic is
unaffected.
uIP expects the timer roughly every ten seconds; drive it from the
once-per-second housekeeping in idle().
The guard read `if (!DHCP_P->tid == HTONS(...))`. Unary `!` binds tighter
than `==`, so this evaluated `(!tid) == HTONS(id)`, i.e. `(tid ? 0 : 1) ==
HTONS(id)`, which is false for any non-zero id and never returns. The reply
was therefore accepted regardless of its transaction id, so a broadcast
reply meant for another client on the segment was parsed as ours.
Compare the field directly. The id is stored network-order in the packet
and host-order in the state, matching the HTONS() used when the request is
built, so `DHCP_P->tid != HTONS(dhcp_state.transaction_id)` is the intended
test.
The port table skipped every SFP port outright, so on a SWTGW218AS the
uplink simply was not there. Of the seven columns only Set Speed is
meaningless for a module: the name, the link speed and the devices behind
the port all are worth showing, and the name in particular was accepted on
another page and then never displayed anywhere. The MTU table further down
the same page has always drawn the port, so the page disagreed with itself.
Give an SFP port its row and leave the three control cells empty. Whether
speed and disable should work for a module is a separate question and
untested, so this does not offer a button for it.
The link state was read one port too far. main.js fills pState by
portNum - 1, updatePortTable() reads pState[i-1], and createPortTable()
read pState[i], so every row started out showing the next port's link
speed until the first refresh corrected it. On the last copper port that
meant showing the uplink's speed. Feeding the real status.json of a nine
port switch through both versions:
expected 7 7 7 1 7 1 7 7 6
before 7 7 1 7 1 7 7 6
after 7 7 7 1 7 1 7 7 6
Dropping the skip also removes a trap rather than papering over it.
updatePortTable() addresses rows as tbl.rows[i], which only lined up with
port i because the SFP port happens to be last on this board. With a
module in the middle every row after it would have been off by one.
A device on an aggregate is learned against whichever member the frame came in
on, and the hash moves that around: the same address changes port every time
the flow mix changes. The table was telling the truth and there was no way to
read it, since nothing on the page or the console says those two ports are one
link.
port_lag_of() already exists and already knows the answer, so both views ask
it. The console prints LAG1 in place of the member, and /l2.json carries a
"lag" field beside the port, 0 when the port stands alone, which is the shape
/stp.json already uses.
Costs 151 bytes of BANK1.
Two small things about the same command.
The usage line offered "lag <1-4> [port]...", which leaves out "lag show" even
though that is the only way to see the groups, so the one subcommand a reader
most needs is the one the error does not mention.
And a group number with no ports after it quietly wiped the group. That is a
reasonable thing to want and an unreasonable thing to do by accident, as it is
one fat-fingered return away from a bare "lag 1". It now takes "lag 1 delete"
or "lag 1 d", and a bare group number prints the usage instead.
Nothing changes for a saved configuration: "lag 1 5 6" is what gets written and
what gets replayed, and neither the old bare form nor the new delete matches
the pattern that decides what is persisted.
The LAG page draws four sections headed LAG 1 to LAG 4 and wires their buttons
to lagSub(0) through lagSub(3), which then sends the index straight through as
the group number. So the first button asks for "lag 0", which the parser
rejects, and the page shows nothing at all because the error only goes to the
console. Every other button is off by one: the section headed LAG 2 creates
group 1.
The index stays 0-based for the element ids and only the command gets the
1-based number the CLI documents.
* uip: time out an ESTABLISHED connection whose peer went silent
uIP has no keepalive and no idle timeout for an ESTABLISHED connection, so
a peer that vanishes without FIN or RST holds it open forever. A crashed
client does it, and so does a SYN caught while the switch is still
booting. With UIP_CONF_MAX_CONNECTIONS = 1 that wedges the single slot:
the web UI stops answering, port 80 no longer even SYN-ACKs, and only a
power cycle recovers it. Every other TCP state already has an exit path
(UIP_MAXRTX, UIP_TIME_WAIT_TIMEOUT); idle ESTABLISHED was the one hole.
Close it inside uIP rather than in httpd, so any future TCP service is
covered too. The retransmission timer is unused while nothing is in
flight, so the idle count lives in it: a 1 Hz strobe derived from the
uip_periodic() rate ages it, any arriving segment clears it, and past the
limit the connection is aborted through the same path as UIP_MAXRTX. Two
new options in uipopt.h, default off; this project enables 30 s.
httpd also joins uip_timedout() to its cleanup: it only handled closed
and aborted, so both this timeout and the existing UIP_MAXRTX one would
have left the transfer state stuck on a dead connection.
* uip: keep the tuning values out of the prose
The comment named the timeout and the tick rate, which go stale the
moment either constant is edited. It now says why an idle connection
is aged out and leaves the numbers to the defines under it.
The /cmd path carried its own copy of the plain-text response header,
which was the same string page_impl.c already keeps in
HTTP_RESPONCE_TXT, minus one difference: the shared one never said
Connection: close.
This httpd closes after every response, so a reply that does not
advertise it invites the browser to reuse the socket and lose the next
request. HTTP_RESPONCE_JSON has always said so; the text one was the
odd one out, and send_config() and send_cmd_log() were answering
without it.
The copy is gone and the shared string carries the header. The check
for a command that printed nothing now compares against the length
strtox() returned instead of sizeof() on the macro.
The status line built the dotted quad by hand, which is what
print_ip() from cmd_parser.c already does. Reusing it drops seven
calls to one and takes 48 bytes off BANK2.
The prototype is not __banked because cmd_parser.c and syslog.c are
both in BANK2; a plain call is what the compiler needs here. Should
either file move to another bank, this has to become __banked with it.
fetch() does not throw on 4xx, so a request that came back 401 after the
session had timed out reached the same line as a successful one: the
window showed the prompt and nothing under it, and the input was cleared
as if the command had run. The session lasts 200 seconds, so leaving the
tab open is enough to hit it.
A 401 now goes to the login page instead. The transcript also gets a
trailing newline when the answer lacks one, so the next prompt does not
run into the last line of output, and it is capped so a long session
does not keep growing the node.
Three ways the answer could mislead the caller, all in the paths that
matter most when something is wrong.
The capture sat in write_char(), so anything printed through
print_string_no_syslog() escaped it. That is exactly the replies of the
syslog commands, which deliberately avoid the syslog path: "syslog on"
answered with the bare address and no sentence around it, "syslog off"
answered with nothing at all. Moving the capture one level down, into
write_char_no_syslog(), catches both paths and costs nothing, since
write_char() reaches it anyway.
On a parse error send_bad_request() rewrote the buffer from the start,
throwing away the very text that explains the error and replacing it
with the 400 HTML page. Keeping the captured text and restating only the
status keeps the parser's own message; "400 NO" is as long as "200 OK",
so the header does not have to be rebuilt.
An overlong listing was cut at the buffer end with nothing to show for
it, so a clipped answer read as a short one. It now ends in a marker,
and the reserved room is accounted for in the guard.
While here: a command that configures something prints nothing, and an
empty body reads the same as "nothing ran", so a successful silent
command now answers "OK".
No internal RAM and no xdata; 174 bytes of BANK1, which has 7356 left.
The console tab posts to /cmd and throws the response away, so the page stayed
silent whether the command worked, was refused or was just misspelt. Now that
/cmd answers with the command's output, the page keeps a running transcript:
each command echoed after a prompt, then whatever it printed.
The box is a pre element filled through textContent, so nothing the device
prints is taken for markup. It scrolls to the newest line and the input clears
after a send.
POST /cmd runs the command and answers with an empty 200, so a caller cannot
tell "done" from "nothing happened", and whatever the command prints only
reaches the serial console. Reading a register over the network needs a second
channel just to see the answer.
write_char() is the one funnel every console helper goes through, and it already
tees into the syslog buffer. A third sink, live only while the httpd runs a
command that arrived over the network, puts the same bytes into the response
behind the header. Serial and syslog keep getting their copy.
The capture stops at the end of the response buffer, so a long listing is
truncated rather than overrunning it.
BANK1 grows 39 bytes and the common area 52. One byte of xdata, BANK2 unchanged.
login.html asks for i18n.js, but the file is not on the short list a
client may have before it authenticates, so the request is answered with
a redirect back to the login page and the strings stay as the English
that is baked into the markup.
The file carries only the interface text, the same text the page already
ships untranslated, so serving it before login gives nothing away.
The enabled flag is a flag, so say bool. The header length no longer needs
to live in xdata: it was put there when a local would not link, and there
is room for it here.
The overview names the row after the JSON key, so the syslog row said
"syslog_server_ip" while carrying only an address. It now says
"syslog_server" and carries the port with it.
The pointer is masked when it advances over the command text, then
incremented once more for the newline without masking, so it can come to
rest one past the end of the ring.
Both readers walk from the pointer with their own index masked every
step, so an index that sits outside the ring is never reached and the
walk does not end. `history` on the console spins there, and so does
`/cmd_log`, which the web page fetches whenever settings are saved: it
fills the transmit buffer and keeps going past it.
The member mask is filled with a loop that stops one short, so the
highest front panel port never gets its bit and stays isolated from the
port that was just opened up. Every other loop over the port range in
the tree treats machine.max_port as the last port rather than the one
past it.
An empty slot used to read back 0xa0 per byte and the filter dropped it,
so the field came out empty. Block reads report the failure instead and
leave the buffer alone, and these two callers ignored that and printed
what the last successful read had left there.
Say nothing when there is nothing to read, which is what the other eight
callers of sfp_read_block() already do.
The port argument went through its own digit test and machine table
lookup; cmd_parse_port_separator() does both and also checks the port
exists on this board, which the open-coded test did not.
A port priority was masked to its top nibble, so "prio 17" quietly became
16. The bridge priority next to it refuses what it cannot represent, and
now the port priority does too.
Both only ever served stp_fdb_update(), so they belong there. Internal RAM
has room for them on this branch and on the one that carries the
aggregation module too.
stp_enabled is a flag, so say bool. cmpBytes() returns a comparison
result, so say int8_t. The three busy waits this branch adds read the
status straight out of the SFR instead of copying four bytes to xdata
first.
A port held out of forwarding because a loop was seen on it stops hearing
the frames that justified the hold, so its BPDU age climbs. The auto edge
branch lives inside the same countdown as the hold, reads that age, and
promotes the port back to forwarding after three seconds. The loop opens,
a BPDU comes back, the block is applied again, and the two take turns.
Measured on a looped pair present when the tree came up: twenty cycles in
one window and fifteen in the next, each block followed by a promotion,
still going when the capture ended.
The countdown alone cannot tell a loop hold from an ordinary listen, so
record the hold and leave the port alone while it stands.
tcpip_output() decides whether to splice in the 802.1Q tag, and that
decision also moves the frame: the header is shifted forward over its
padding, so a tagged frame starts at uip_buf with the q_frame layout,
while an untagged one keeps the padding and the nonq_frame layout.
nic_tx_packet() took that decision a second time, from management_vlan
alone. That agreed while the sender suppressed the management VLAN around
the transmission, but not since the tag is skipped per frame for a
CPU-tagged one: the descriptor then still sits behind the padding while
the transfer is set up for the shifted layout. The frame goes out four
bytes early and its length is read from the offset where tx_seq and
chksum_flags live, so a sixty byte BPDU is sent as around 1800 bytes of
whatever follows it. Looped back it is no longer a BPDU, the port hears
nothing, auto edge promotes it and the loop stays open.
Record the decision where it is taken and let the transfer follow it.
A variable rather than an argument because internal RAM is full once the
aggregation module shares the image: the overlay area ends at 0x7f, and
an argument or any temporary for the condition no longer fits.
The hand rolled loop was here because atoi_short() reported "no digits"
but not overflow, so 65540 would have wrapped to 4 and opened a
connection to a port nobody asked for. #326 gave it the same bound this
loop was carrying, so the reason is gone.
Zero still covers all three ways to be wrong, except that "no digits"
and overflow now come back as a zero return and port zero as a zero
value, so both are tested.
Three xdata scratch variables go with the loop.
The loop tested the digit range and the overflow bound with separate ifs,
on the strength of a comment saying the joined form makes sdcc park a
boolean in the bit area, and that an image carrying LACP and STP as well
is one bit short of needing a third byte of it. Measured on this branch
that is not what happens: the joined form links, the bit segment is
unchanged at fourteen bits overall and nine in cmd_parser, and BANK2
comes out ten bytes smaller.
The claim was about an image this branch does not build, and no branch
currently carries LACP, STP and this parser at once, so there is nothing
left to check it against. A justification nobody can verify, for a shape
nobody would otherwise write, is worse than no comment at all.
Behaviour is unchanged. The two forms agree on every input from 0 to
99999 and on the edges: empty, non digits, trailing junk, leading zeros,
65535 and 65536.
The note about atoi_short() stays, because that one still reports "no
digits" without reporting overflow. #326 replaces it with a version that
does both, and this should move onto it once that lands.
Saving the configuration drops the syslog server address whenever the log
of executed commands also contains "syslog on", which it almost always
does, since you have to enable the thing after pointing it somewhere.
parseConf() deduplicates by taking the matched text of a conf_overwrite
entry and removing every stored line that starts with it. For "syslog on"
the entry that matches is the catch-all ^syslog\b, so the matched text is
just "syslog" and the filter removes anything beginning with "syslog ",
including the "syslog ip ..." line saved a moment earlier. The address then
falls back to 0.0.0.0 on the next boot.
It fails quietly: nothing is reported, the running switch keeps logging
until it is restarted, and the loss looks like the firmware forgetting a
setting rather than the page dropping it.
Narrow the entry to the commands it is meant to collapse, so the address and
the port keep their own entries and are no longer collateral.
That alone would stop "syslog on" and "syslog off" from replacing each other,
because the list drops lines starting with the text it matched and "syslog off"
does not start with "syslog on". A separate list names the stem of such a pair
and collapses the two, which is what the catch-all used to do by accident.
The port was frozen at 514 in the call that opens the connection, so a
collector listening anywhere else was simply out of reach, and plenty do,
because 514 is privileged and containerised collectors usually get a high
port instead. Working around it meant putting a proxy in front, which then
rewrites the source address and hides which device actually sent the line.
Add `syslog port <n>`. The default stays 514, so nothing changes for an
existing configuration. Setting it tears the connection down and builds a
new one, the same dance the address already does, because uip_udp_new()
freezes the port into the connection.
The value is parsed here rather than through atoi_short(), which reports
"no digits" but not overflow: 65540 would quietly wrap to 4 and we would
open a connection to a port nobody asked for. Checking before each multiply
keeps it in 16-bit arithmetic. Zero then covers all three ways to be wrong -
no digits, past 65535, or an explicit "0", which is not a port either.
Whitelist the new command in config.js as well, next to `syslog ip`, or the
line is dropped without a word when the configuration is saved and the
setting quietly fails to survive a reboot. The dedup entry has to precede
the general `^syslog\b` one, otherwise it would deduplicate against
`syslog on`.
itoa_short() is new: itoa() only handles a byte and print_short() prints
hex, so there was no way to show a port as a decimal number. Kept separate
from itoa() rather than widening it, because every existing caller passes a
byte and would start paying for 16-bit divisions it does not need.
The scratch variables for the parser live in xdata. Locals there would take
internal RAM, and this image has none left: data ends at 0x77, the overlay
occupies 0x78-0x7f and the stack starts at 0x80. Measured: no module's DSEG
grew.
RFC 3164 has a hostname between the priority and the message text, and we
were sending nothing there. A receiver still has to fill that field, so it
takes the first word of the text instead, so every line arrives attributed to
"STP:", or "REGGET:", or whatever the log happens to start with. The sender
is then impossible to select on: the name changes with the content, and
anything in front of us on the path replaces the source address with its
own.
Observed on a collector behind a UDP proxy: the same switch showed up as two
different hosts depending on which subsystem had logged last.
Send the configured hostname. Skipped when it is empty, so we never emit a
lone separator.
The header length lives in xdata rather than on the stack. syslog_callback()
is __banked, so a local there cannot be overlaid, and while the variable
itself is only two bytes it costs more than that: it takes a register, which
pushes log_start out of one and into internal RAM. Those two bytes are
enough to stop an image carrying LACP and STP from linking at all.
Both conflicts are the register keyword removal meeting a change of ours,
so each takes main's signature and keeps what the branch was saying:
nic_rx_packet() still returns a bool, and port_ingress_filter_get() stays
declared.
main has since put its own copy of the STP module in BANK2, so the pragma
this branch carried is now duplicated. The one with main's comment stays.
cmd_parser.c conflicted twice: main rewrote the pvid command around the
new port-separator and atoi helpers, next to the line where this branch
delegates "stp" to stp_parse(). Both belong, so the STP delegation keeps
main's pvid body.
The linker caught what the merge could not see: main changed atoi_byte()
to return the digit count and leave the value in atoi_results_u8, where
it used to return non-zero on failure and write through a pointer. Note
the sense is inverted, so the three calls in rtl837x_stp.c are adjusted
rather than just re-arranged.
This branch moved rtl837x_pins to the common window in eaff953 to reclaim
BANK2 for the per-port status work, which was free at the time because the
module was only the I2C and GPIO pin helpers.
main has since put the SFP EEPROM transfer there, so the module now weighs
934 bytes and the common window is 156 bytes short. BANK2 has room for it
again, and that is where main keeps it.
Common segment +934 bytes, BANK2 -934.
Only httpd.c conflicted: main added the buffered configuration upload
next to the pointers this branch had moved into xdata to free internal
RAM. Both belong, so the new globals sit above declarations that keep
their storage class.
d00f