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Text formatting changes.

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This commit is contained in:
Matthew N. Dodd 2003-03-29 01:53:13 +00:00
parent c040a3e16e
commit d1b27132c9
2 changed files with 68 additions and 65 deletions
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120
sys/dev/ie/if_ie.c
View File

@ -70,43 +70,45 @@
*/
/*
Mode of operation:
We run the 82586 in a standard Ethernet mode. We keep NFRAMES received
frame descriptors around for the receiver to use, and NRXBUFS associated
receive buffer descriptors, both in a circular list. Whenever a frame is
received, we rotate both lists as necessary. (The 586 treats both lists
as a simple queue.) We also keep a transmit command around so that packets
can be sent off quickly.
We configure the adapter in AL-LOC = 1 mode, which means that the
Ethernet/802.3 MAC header is placed at the beginning of the receive buffer
rather than being split off into various fields in the RFD. This also
means that we must include this header in the transmit buffer as well.
By convention, all transmit commands, and only transmit commands, shall
have the I (IE_CMD_INTR) bit set in the command. This way, when an
interrupt arrives at ieintr(), it is immediately possible to tell
what precisely caused it. ANY OTHER command-sending routines should
run at splimp(), and should post an acknowledgement to every interrupt
they generate.
The 82586 has a 24-bit address space internally, and the adaptor's memory
is located at the top of this region. However, the value we are given in
configuration is normally the *bottom* of the adaptor RAM. So, we must go
through a few gyrations to come up with a kernel virtual address which
represents the actual beginning of the 586 address space. First, we
autosize the RAM by running through several possible sizes and trying to
initialize the adapter under the assumption that the selected size is
correct. Then, knowing the correct RAM size, we set up our pointers in
the softc `iomem' represents the computed base of the 586 address
space. `iomembot' represents the actual configured base of adapter RAM.
Finally, `iosize' represents the calculated size of 586 RAM. Then, when
laying out commands, we use the interval [iomembot, iomembot + iosize); to
make 24-pointers, we subtract iomem, and to make 16-pointers, we subtract
iomem and and with 0xffff.
*/
* Mode of operation:
*
* We run the 82586 in a standard Ethernet mode. We keep NFRAMES
* received frame descriptors around for the receiver to use, and
* NRXBUFS associated receive buffer descriptors, both in a circular
* list. Whenever a frame is received, we rotate both lists as
* necessary. (The 586 treats both lists as a simple queue.) We also
* keep a transmit command around so that packets can be sent off
* quickly.
*
* We configure the adapter in AL-LOC = 1 mode, which means that the
* Ethernet/802.3 MAC header is placed at the beginning of the receive
* buffer rather than being split off into various fields in the RFD.
* This also means that we must include this header in the transmit
* buffer as well.
*
* By convention, all transmit commands, and only transmit commands,
* shall have the I (IE_CMD_INTR) bit set in the command. This way,
* when an interrupt arrives at ieintr(), it is immediately possible
* to tell what precisely caused it. ANY OTHER command-sending routines
* should run at splimp(), and should post an acknowledgement to every
* interrupt they generate.
*
* The 82586 has a 24-bit address space internally, and the adaptor's
* memory is located at the top of this region. However, the value
* we are given in configuration is normally the *bottom* of the adaptor
* RAM. So, we must go through a few gyrations to come up with a
* kernel virtual address which represents the actual beginning of the
* 586 address space. First, we autosize the RAM by running through
* several possible sizes and trying to initialize the adapter under
* the assumption that the selected size is correct. Then, knowing
* the correct RAM size, we set up our pointers in the softc `iomem'
* represents the computed base of the 586 address space. `iomembot'
* represents the actual configured base of adapter RAM. Finally,
* `iosize' represents the calculated size of 586 RAM. Then, when
* laying out commands, we use the interval [iomembot, iomembot +
* iosize); to make 24-pointers, we subtract iomem, and to make
* 16-pointers, we subtract iomem and and with 0xffff.
*/
#include "ie.h"
#include "opt_inet.h"
@ -250,28 +252,28 @@ static const char *ie_hardware_names[] = {
};
/*
sizeof(iscp) == 1+1+2+4 == 8
sizeof(scb) == 2+2+2+2+2+2+2+2 == 16
NFRAMES * sizeof(rfd) == NFRAMES*(2+2+2+2+6+6+2+2) == NFRAMES*24 == 384
sizeof(xmit_cmd) == 2+2+2+2+6+2 == 18
sizeof(transmit buffer) == 1512
sizeof(transmit buffer desc) == 8
-----
1946
NRXBUFS * sizeof(rbd) == NRXBUFS*(2+2+4+2+2) == NRXBUFS*12
NRXBUFS * IE_RBUF_SIZE == NRXBUFS*256
NRXBUFS should be (16384 - 1946) / (256 + 12) == 14438 / 268 == 53
With NRXBUFS == 48, this leaves us 1574 bytes for another command or
more buffers. Another transmit command would be 18+8+1512 == 1538
---just barely fits!
Obviously all these would have to be reduced for smaller memory sizes.
With a larger memory, it would be possible to roughly double the number of
both transmit and receive buffers.
*/
* sizeof(iscp) == 1+1+2+4 == 8
* sizeof(scb) == 2+2+2+2+2+2+2+2 == 16
* NFRAMES * sizeof(rfd) == NFRAMES*(2+2+2+2+6+6+2+2) == NFRAMES*24 == 384
* sizeof(xmit_cmd) == 2+2+2+2+6+2 == 18
* sizeof(transmit buffer) == 1512
* sizeof(transmit buffer desc) == 8
* -----
* 1946
*
* NRXBUFS * sizeof(rbd) == NRXBUFS*(2+2+4+2+2) == NRXBUFS*12
* NRXBUFS * IE_RBUF_SIZE == NRXBUFS*256
*
* NRXBUFS should be (16384 - 1946) / (256 + 12) == 14438 / 268 == 53
*
* With NRXBUFS == 48, this leaves us 1574 bytes for another command or
* more buffers. Another transmit command would be 18+8+1512 == 1538
* ---just barely fits!
*
* Obviously all these would have to be reduced for smaller memory sizes.
* With a larger memory, it would be possible to roughly double the number
* of both transmit and receive buffers.
*/
#define NFRAMES 8 /* number of receive frames */
#define NRXBUFS 48 /* number of buffers to allocate */

13
sys/dev/ie/if_iereg.h
View File

@ -8,13 +8,14 @@
#define IEATT_REVISION 6 /* read here to figure out this board */
#define IEATT_ATTRIB 7 /* more information about this board */
#define SL_BOARD(x) ((x) & 0x0f)
#define SL_REV(x) ((x) >> 4)
#define SL_BOARD(x) ((x) & 0x0f)
#define SL_REV(x) ((x) >> 4)
#define SL1_BOARD 0
#define SL10_BOARD 1
#define EN100_BOARD 2
#define SLFIBER_BOARD 3
#define SL1_BOARD 0x00
#define SL10_BOARD 0x01
#define EN100_BOARD 0x02
#define SLFIBER_BOARD 0x03
#define NI5210_BOARD 0x0055
#define SL_ATTR_WIDTH 0x04 /* bus width: clear -> 8-bit */
#define SL_ATTR_SPEED 0x08 /* medium speed: clear -> 10 Mbps */