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Text formatting changes.
This commit is contained in:
Matthew N. Dodd
parent
c040a3e16e
commit
d1b27132c9
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=112765
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@ -70,43 +70,45 @@
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*/
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/*
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Mode of operation:
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We run the 82586 in a standard Ethernet mode. We keep NFRAMES received
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frame descriptors around for the receiver to use, and NRXBUFS associated
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receive buffer descriptors, both in a circular list. Whenever a frame is
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received, we rotate both lists as necessary. (The 586 treats both lists
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as a simple queue.) We also keep a transmit command around so that packets
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can be sent off quickly.
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We configure the adapter in AL-LOC = 1 mode, which means that the
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Ethernet/802.3 MAC header is placed at the beginning of the receive buffer
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rather than being split off into various fields in the RFD. This also
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means that we must include this header in the transmit buffer as well.
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By convention, all transmit commands, and only transmit commands, shall
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have the I (IE_CMD_INTR) bit set in the command. This way, when an
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interrupt arrives at ieintr(), it is immediately possible to tell
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what precisely caused it. ANY OTHER command-sending routines should
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run at splimp(), and should post an acknowledgement to every interrupt
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they generate.
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The 82586 has a 24-bit address space internally, and the adaptor's memory
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is located at the top of this region. However, the value we are given in
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configuration is normally the *bottom* of the adaptor RAM. So, we must go
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through a few gyrations to come up with a kernel virtual address which
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represents the actual beginning of the 586 address space. First, we
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autosize the RAM by running through several possible sizes and trying to
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initialize the adapter under the assumption that the selected size is
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correct. Then, knowing the correct RAM size, we set up our pointers in
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the softc `iomem' represents the computed base of the 586 address
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space. `iomembot' represents the actual configured base of adapter RAM.
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Finally, `iosize' represents the calculated size of 586 RAM. Then, when
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laying out commands, we use the interval [iomembot, iomembot + iosize); to
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make 24-pointers, we subtract iomem, and to make 16-pointers, we subtract
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iomem and and with 0xffff.
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*/
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* Mode of operation:
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*
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* We run the 82586 in a standard Ethernet mode. We keep NFRAMES
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* received frame descriptors around for the receiver to use, and
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* NRXBUFS associated receive buffer descriptors, both in a circular
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* list. Whenever a frame is received, we rotate both lists as
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* necessary. (The 586 treats both lists as a simple queue.) We also
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* keep a transmit command around so that packets can be sent off
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* quickly.
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*
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* We configure the adapter in AL-LOC = 1 mode, which means that the
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* Ethernet/802.3 MAC header is placed at the beginning of the receive
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* buffer rather than being split off into various fields in the RFD.
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* This also means that we must include this header in the transmit
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* buffer as well.
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*
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* By convention, all transmit commands, and only transmit commands,
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* shall have the I (IE_CMD_INTR) bit set in the command. This way,
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* when an interrupt arrives at ieintr(), it is immediately possible
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* to tell what precisely caused it. ANY OTHER command-sending routines
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* should run at splimp(), and should post an acknowledgement to every
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* interrupt they generate.
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*
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* The 82586 has a 24-bit address space internally, and the adaptor's
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* memory is located at the top of this region. However, the value
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* we are given in configuration is normally the *bottom* of the adaptor
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* RAM. So, we must go through a few gyrations to come up with a
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* kernel virtual address which represents the actual beginning of the
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* 586 address space. First, we autosize the RAM by running through
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* several possible sizes and trying to initialize the adapter under
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* the assumption that the selected size is correct. Then, knowing
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* the correct RAM size, we set up our pointers in the softc `iomem'
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* represents the computed base of the 586 address space. `iomembot'
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* represents the actual configured base of adapter RAM. Finally,
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* `iosize' represents the calculated size of 586 RAM. Then, when
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* laying out commands, we use the interval [iomembot, iomembot +
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* iosize); to make 24-pointers, we subtract iomem, and to make
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* 16-pointers, we subtract iomem and and with 0xffff.
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*/
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#include "ie.h"
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#include "opt_inet.h"
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@ -250,28 +252,28 @@ static const char *ie_hardware_names[] = {
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};
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/*
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sizeof(iscp) == 1+1+2+4 == 8
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sizeof(scb) == 2+2+2+2+2+2+2+2 == 16
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NFRAMES * sizeof(rfd) == NFRAMES*(2+2+2+2+6+6+2+2) == NFRAMES*24 == 384
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sizeof(xmit_cmd) == 2+2+2+2+6+2 == 18
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sizeof(transmit buffer) == 1512
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sizeof(transmit buffer desc) == 8
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-----
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1946
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NRXBUFS * sizeof(rbd) == NRXBUFS*(2+2+4+2+2) == NRXBUFS*12
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NRXBUFS * IE_RBUF_SIZE == NRXBUFS*256
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NRXBUFS should be (16384 - 1946) / (256 + 12) == 14438 / 268 == 53
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With NRXBUFS == 48, this leaves us 1574 bytes for another command or
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more buffers. Another transmit command would be 18+8+1512 == 1538
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---just barely fits!
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Obviously all these would have to be reduced for smaller memory sizes.
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With a larger memory, it would be possible to roughly double the number of
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both transmit and receive buffers.
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*/
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* sizeof(iscp) == 1+1+2+4 == 8
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* sizeof(scb) == 2+2+2+2+2+2+2+2 == 16
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* NFRAMES * sizeof(rfd) == NFRAMES*(2+2+2+2+6+6+2+2) == NFRAMES*24 == 384
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* sizeof(xmit_cmd) == 2+2+2+2+6+2 == 18
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* sizeof(transmit buffer) == 1512
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* sizeof(transmit buffer desc) == 8
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* -----
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* 1946
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*
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* NRXBUFS * sizeof(rbd) == NRXBUFS*(2+2+4+2+2) == NRXBUFS*12
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* NRXBUFS * IE_RBUF_SIZE == NRXBUFS*256
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*
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* NRXBUFS should be (16384 - 1946) / (256 + 12) == 14438 / 268 == 53
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*
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* With NRXBUFS == 48, this leaves us 1574 bytes for another command or
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* more buffers. Another transmit command would be 18+8+1512 == 1538
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* ---just barely fits!
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*
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* Obviously all these would have to be reduced for smaller memory sizes.
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* With a larger memory, it would be possible to roughly double the number
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* of both transmit and receive buffers.
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*/
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#define NFRAMES 8 /* number of receive frames */
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#define NRXBUFS 48 /* number of buffers to allocate */
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@ -8,13 +8,14 @@
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#define IEATT_REVISION 6 /* read here to figure out this board */
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#define IEATT_ATTRIB 7 /* more information about this board */
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#define SL_BOARD(x) ((x) & 0x0f)
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#define SL_REV(x) ((x) >> 4)
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#define SL_BOARD(x) ((x) & 0x0f)
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#define SL_REV(x) ((x) >> 4)
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#define SL1_BOARD 0
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#define SL10_BOARD 1
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#define EN100_BOARD 2
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#define SLFIBER_BOARD 3
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#define SL1_BOARD 0x00
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#define SL10_BOARD 0x01
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#define EN100_BOARD 0x02
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#define SLFIBER_BOARD 0x03
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#define NI5210_BOARD 0x0055
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#define SL_ATTR_WIDTH 0x04 /* bus width: clear -> 8-bit */
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#define SL_ATTR_SPEED 0x08 /* medium speed: clear -> 10 Mbps */
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