WIP: Feeds packets into IP, and gets back to ETHTXI

2026-03-20 08:28:43 +00:00 · 2018-08-10 02:52:15 +01:00
parent a93bea20e1
commit 8dfde72949
2 changed files with 65 additions and 31 deletions
--- a/src/system/ether.1
+++ b/src/system/ether.1
@@ -15,6 +15,8 @@
 ;;; You should have received a copy of the GNU General Public License
 ;;; along with this program. If not, see <https://www.gnu.org/licenses/>.

+;FIXME The big one - interrupts? Compare with CHAOS...
+
 ;;; Generic Ethernet support

 %NE32==37777777777
@@ -88,11 +90,6 @@ ETHATS:	0			;Number of entries in ARP table

 BBLK

-IPOGO:	BUG INFO,[ipogo]
-	POPJ P,
-IPKSNE:	BUG INFO,[ipksne]
-	POPJ P,
-
 ;Process a received packet.
 ;R is buffer. Length in bytes is I. May clobber A-I, R.
 ;
@@ -104,7 +101,7 @@ ETHRX:	MOVEI TT,ETHHBF		;Unpack Ethernet header into ETHHBF
 	ADDI R,%NEH"WORDS	;R points to data

 	LDB A,[%NEH"TYPE+ETHHBF]
-	BUG INFO,[etype=],OCT,A
+	;BUG INFO,[etype=],OCT,A
 	CAIN A,%NETYP"IP
 	 JRST ETHRXI
 	CAIN A,%NETYP"ARP
@@ -114,7 +111,7 @@ ETHRX:	MOVEI TT,ETHHBF		;Unpack Ethernet header into ETHHBF

 ;Process an ARP packet.
 ;
-ETHRXA:	BUG INFO,[ARP length ],OCT,I
+ETHRXA:	;BUG INFO,[ARP length ],OCT,I
 	CAIGE I,%NEAH"LENGTH	;Check size first
 	 JRST ETHRAS

@@ -138,13 +135,13 @@ ETHRXA:	BUG INFO,[ARP length ],OCT,I
 	LSH A,16.
 	LDB B,[%NEAH"SPA1+ETHABF]
 	IOR A,B
-	BUG INFO,[ARP source addr ],OCT,A
+	;BUG INFO,[ARP source addr ],OCT,A

 	MOVE E,ETHATS		;Is the IP address in the table already?
 	SOS E
 ETHRX1:	JUMPL E,ETHRX2		;Any more entries to check?
 	LDB B,[%NEAT"PA+ETHAT(E)]
-	BUG INFO,[ARP table entry ],OCT,E,[ of ],OCT,ETHATS,[ is ],OCT,B
+	;BUG INFO,[ARP table entry ],OCT,E,[ of ],OCT,ETHATS,[ is ],OCT,B
 	CAMN A,B		;Match?
 	 JRST ETHRX3		; Yes - update it
 	SOJA E,ETHRX1		;Prev entry
@@ -165,7 +162,7 @@ ETHRX3: DPB A,[%NEAT"PA+ETHAT(E)]	;Store IP address
 	BUG INFO,[Set ARP table entry ],OCT,E,[ to ip ],OCT,A,[ mac ],OCT,C,[ ],OCT,D

 	LDB E,[%NEAH"OP+ETHABF]	;Get op
-	BUG INFO,[ARP op ],OCT,E
+	;BUG INFO,[ARP op ],OCT,E
 	CAIE E,%NEAOP"REQ	;Is this a request?
 	 POPJ P,		;No - nothing more to do

@@ -173,7 +170,7 @@ ETHRX3: DPB A,[%NEAT"PA+ETHAT(E)]	;Store IP address
 	CAME B,[ETHUS]			;Is it our address?
 	 POPJ P,		;No - nothing more to do

-	BUG INFO,[ARP reply]
+	;BUG INFO,[ARP reply]
 	MOVEI E,%NEAOP"REPLY		;Construct reply packet
 	DPB E,[%NEAH"OP+ETHABF]
 	DPB A,[%NEAH"TPA+ETHABF]	;Set sender PA as target PA
@@ -205,9 +202,47 @@ ETHRAP:	BUG INFO,[ARP wrong protocol ],OCT,B
 	POPJ P,

 ;Process an IPv4 packet.
+;May clobber A-I, R.
 ;
-ETHRXI:
-	BUG INFO,[IP]
+ETHRXI:	PUSH P,Q		;IP can clobber all of these...
+	PUSH P,J
+	PUSH P,R
+	PUSH P,W
+	PUSH P,H
+
+	MOVE A,I		;Compute number of words
+	AOS A
+	LSH A,-2
+	MOVE C,A
+	;BUG INFO,[IP ipgipt A=],OCT,A
+	PUSHJ P,IPGIPT		;Get IP buffer -> A=datagram struct
+	 JRST ETHRX5		; No buffers
+
+	MOVE B,PK.BUF(A)	;IPGIPT does return this, but in BLKI form...
+	BUG INFO,[IP rx allocated A=],OCT,A,[ B=],OCT,B
+	HRL B,R
+	ADDI C,-1(B)
+	BLTUB B,(C)		;Copy packet
+
+	MOVE B,C		;Words in datagram
+	SETZM C			;Offset to header
+	SETZM J			;Host table index of address (not used)
+	PUSHJ P,IPRDGM
+
+	;BUG INFO,[IP rdgm done]
+
+ETHRX5:	POP P,H
+	POP P,W
+	POP P,R
+	POP P,J
+	POP P,Q
+	POPJ P,
+
+;Send an IP packet (like IPKSNC for CHAOS).
+;A contains datagram struct.
+;
+ETHTXI:	MOVE B,PK.DST(A)
+	BUG INFO,[ethtxi A=],OCT,A,[ dest=],OCT,B
 	POPJ P,

 ;Send an Ethernet packet (if possible).
@@ -218,7 +253,7 @@ ETHRXI:
 ETHTX:	BUG INFO,[ethtx ptr ],OCT,R,[ len ],OCT,I
 	PUSHJ P,UNAFF			;Find a free transmit buffer
 	 POPJ P,			;None left. Give up.
-	BUG INFO,[ethtx buf ],OCT,B,[ desc ],OCT,D,[ len ],OCT,I
+	;BUG INFO,[ethtx buf ],OCT,B,[ desc ],OCT,D,[ len ],OCT,I

 	MOVE TT,B			;Convert header
 	HRLI TT,ETHHBF
@@ -232,17 +267,18 @@ ETHTX:	BUG INFO,[ethtx ptr ],OCT,R,[ len ],OCT,I
 	LSH A,-2
 	ADD A,B
 	MOVE C,TT	;XXX
-	BUG INFO,[ethtx data bltbu tt ],OCT,C,[ a ],OCT,A
+	;BUG INFO,[ethtx data bltbu tt ],OCT,C,[ a ],OCT,A
 	BLTBU TT,(A)

 	ADDI I,%NEH"LENGTH-%NEH"PAD	;Add length of header
-	BUG INFO,[ethtx end desc ],OCT,D,[ len ],OCT,I
+	;BUG INFO,[ethtx end desc ],OCT,D,[ len ],OCT,I
 	JRST UNATX			;Transmit it

 ;Check whether the interface is able to send a packet.
 ;Skip-return if it is.
 ;
 ETHCTS:
+	BUG INFO,[ethcts]
 ;FIXME check if we have an ARP entry, and if not, send a request
 	AOS (P)
 	POPJ P,
@@ -262,6 +298,8 @@ EBLK
 ;address and the two Unibus addresses. We could then
 ;allocate on the fly while setting up the rings.
 ;FIXME The setup stuff might also be cleaner with byte ptrs as above.
+;FIXME Or should we just use IP buffers for all of this? They seem to be
+;half-page-aligned...

 UNPAGS:	BLOCK %UNNPG		;PDP-10 pages: 0,,addr
 UNPAGU:	BLOCK %UNNPG		;Unibus pages: first-addr,,second-addr
@@ -370,6 +408,7 @@ IFE 0,[
 	MOVEI A,%UN0"DNI+%UNCMD"GETPCB	;Ack DNI as it's on after reset
 	PUSHJ P,UNACMD		;We've really returned to the caller here

+	;FIXME put IP address in too, use in ARP above
 	;Get the MAC address for ARP to use
 	MOVE A,UNPAGS
 	MOVSI TT,%UNAF"RDDPA
@@ -385,10 +424,10 @@ IFE 0,[
 	LSH A,16.
 	ILDB B,TT
 	IOR A,B
-	BUG INFO,[my MAC 01 =],OCT,A
+	;BUG INFO,[my MAC 01 =],OCT,A
 	DPB A,[%NEAT"HA01+ETHME]
 	ILDB A,TT
-	BUG INFO,[my MAC 2 =],OCT,A
+	;BUG INFO,[my MAC 2 =],OCT,A
 	DPB A,[%NEAT"HA2+ETHME]

 	;Set up transmit and receive rings
@@ -600,7 +639,7 @@ UNAFF1:	HRRZ A,E		;Wrap index around

 	HLRZ D,UNTXRP(E)	;Descriptor
 	MOVE A,1(D)		;Is this buffer free? (OWN=0)
-	BUG INFO,[unaff checking slot ],OCT,E,[ status ],OCT,A
+	;BUG INFO,[unaff checking slot ],OCT,E,[ status ],OCT,A
 	TLNE A,%UNTD"OWN
 	 JRST [	AOBJN E,UNAFF1	;Try the next one
 		POPJ P,]	;No buffers free.
@@ -609,7 +648,7 @@ UNAFF1:	HRRZ A,E		;Wrap index around
 	AOS UNTXRI		; (Doesn't matter if it wraps.)

 	HRRZ B,UNTXRP(E)	;Buffer
-	BUG INFO,[unaff found free buffer ],OCT,E,[ desc ],OCT,D,[ buff ],OCT,B
+	;BUG INFO,[unaff found free buffer ],OCT,E,[ desc ],OCT,D,[ buff ],OCT,B
 	AOS (P)			;Skip return
 	POPJ P,

@@ -617,7 +656,7 @@ UNAFF1:	HRRZ A,E		;Wrap index around
 ;Descriptor in D, data length in bytes in I.
 ;Clobbers A.
 ;
-UNATX:	BUG INFO,[unatx desc ],OCT,D,[ length ],OCT,I
+UNATX:	;BUG INFO,[unatx desc ],OCT,D,[ length ],OCT,I
 	HRLM I,0(D)			;Set SLEN
 	MOVSI A,%UNTD"OWN+%UNTD"STF+%UNTD"ENF
 	IORM A,1(D)			;Set flags
--- a/src/system/inet.139
+++ b/src/system/inet.139
@@ -799,7 +799,9 @@ IPQCLS:	HLRZ I,(R)	; Get IQ idx
 IPQCL1:	MOVEI Q,IPUQHD(I)
 	CALL PKQGF(PK.IP)	; Get first thing queued up
 	JUMPE A,[CONO PI,NETON	; Exit if no more.
-		CALRET IPOGO]	; Ensure output fired up.
+IFN IMPP,	CALRET IPOGO	; Ensure output fired up.
+IFE IMPP,	RET
+		]
 	MOVEI Q,IPOUTQ
 	CALL PKQPL(PK.IP)	; Put at end of real output queue
 	JRST IPQCL1
@@ -1245,7 +1247,7 @@ IPSNI1:	MOVE T,TIME		; Remember that this gateway entry was used

 EBLK

-; Network Interface tables.  Currently only knows about IMP and CHAOS.
+; Network Interface tables.  Currently knows about IMP, CHAOS and Ethernet.

 NIFIPA:	; IP Address for network interface
 	IFN IMPP, IMPUS3	; IP address on IMP interface
@@ -1268,7 +1270,7 @@ IFN .-NIFIPN-NNIFS, .ERR Wrong size table - NIFIPN
 NIFIPO:	; IP Output routine for network interface
 	IFN IMPP, IPKSNA	; Send IP dgm to IMP output
 	IFN CHAOSP, IPKSNC	; Send IP dgm to Chaos, may fragment
-	IFN ETHERP, IPKSNE	; Send IP dgm to Ethernet, may fragment
+	IFN ETHERP, ETHTXI	; Send IP dgm to Ethernet, may fragment
 IFN .-NIFIPO-NNIFS, .ERR Wrong size table - NIFIPO

 ;NIFNAM: ; Interface name (in case of PEEKing someday?)
@@ -1434,13 +1436,6 @@ IPKSC9:	MOVE A,J		; The PE

 ] ; IFN CHAOSP

-IFN ETHERP,[
-
-; FIXME write IPKSNE
-; IFE CHAOSP,with IPOGO
-
-] ; IFN ETHERP
-
 IPKSN5:	MOVEI Q,IPUQHD+1	; Put on System Output queue
 	MOVE B,(Q)		; Save prev contents of header
 	CALL PKQPL(PK.IP)