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Kernel: Reword some constants/comments in rtl8139 driver for clarity

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This commit is contained in:
Conrad Pankoff 2019-09-03 23:13:13 +10:00 • committed by Andreas Kling
parent ff2997f018
commit 7c9adcf24e
1 changed files with 9 additions and 7 deletions
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16
Kernel/Net/RTL8139NetworkAdapter.cpp
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@ -40,6 +40,7 @@
#define INT_LENGTH_CHANGE 0x2000
#define INT_SYSTEM_ERROR 0x8000
#define CFG9346_NONE 0x00
#define CFG9346_EEM0 0x40
#define CFG9346_EEM1 0x80
@ -59,7 +60,7 @@
#define RXCFG_AM 0x04
#define RXCFG_AB 0x08
#define RXCFG_AR 0x10
#define RXCFG_WRAP 0x80
#define RXCFG_WRAP_INHIBIT 0x80
#define RXCFG_MAX_DMA_16B 0x000
#define RXCFG_MAX_DMA_32B 0x100
#define RXCFG_MAX_DMA_64B 0x200
@ -220,7 +221,7 @@ void RTL8139NetworkAdapter::reset()
// unlock config registers
out8(REG_CFG9346, CFG9346_EEM0 | CFG9346_EEM1);
// define multicast addresses as 255.255.255.255
// turn on multicast
out32(REG_MAR0, 0xffffffff);
out32(REG_MAR4, 0xffffffff);
// enable rx/tx
@ -234,17 +235,18 @@ void RTL8139NetworkAdapter::reset()
// "basic mode control register" options - 100mbit, full duplex, auto
// negotiation
out16(REG_BMCR, BMCR_SPEED | BMCR_AUTO_NEGOTIATE | BMCR_DUPLEX);
// enable flow control
out8(REG_MSR, MSR_RX_FLOW_CONTROL_ENABLE);
// configure rx: accept physical (MAC) match, multicast, and broadcast,
// use the optional contiguous packet feature, the maximum dma transfer
// size, a 32k buffer, and no fifo threshold
out32(REG_RXCFG, RXCFG_APM | RXCFG_AM | RXCFG_AB | RXCFG_WRAP | RXCFG_MAX_DMA_UNLIMITED | RXCFG_RBLN_32K | RXCFG_FTH_NONE);
// configure tx: default retry count (16), max DMA burst size of 1924
out32(REG_RXCFG, RXCFG_APM | RXCFG_AM | RXCFG_AB | RXCFG_WRAP_INHIBIT | RXCFG_MAX_DMA_UNLIMITED | RXCFG_RBLN_32K | RXCFG_FTH_NONE);
// configure tx: default retry count (16), max DMA burst size of 1024
// bytes, interframe gap time of the only allowable value. the DMA burst
// size is important - silent failures have been observed with 2048 bytes.
out32(REG_TXCFG, TXCFG_TXRR_ZERO | TXCFG_MAX_DMA_1K | TXCFG_IFG11);
// re-lock config registers
out8(REG_CFG9346, 0);
out8(REG_CFG9346, CFG9346_NONE);
// enable rx/tx again in case they got turned off (apparently some cards
// do this?)
out8(REG_COMMAND, COMMAND_RX_ENABLE | COMMAND_TX_ENABLE);
@ -319,8 +321,8 @@ void RTL8139NetworkAdapter::receive()
}
// we never have to worry about the packet wrapping around the buffer,
// since we set RXCFG_WRAP, which allows the rtl8139 to write data past
// the end of the alloted space.
// since we set RXCFG_WRAP_INHIBIT, which allows the rtl8139 to write data
// past the end of the alloted space.
memcpy((u8*)m_packet_buffer, (const u8*)(start_of_packet + 4), length - 4);
// let the card know that we've read this data
m_rx_buffer_offset = ((m_rx_buffer_offset + length + 4 + 3) & ~3) % RX_BUFFER_SIZE;