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hw/net: GMAC Rx Implementation

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- Implementation of Receive function for packets
- Implementation for reading and writing from and to descriptors in
  memory for Rx

When RX starts, we need to flush the queued packets so that they
can be received by the GMAC device. Without this it won't work
with TAP NIC device.

When RX descriptor list is full, it returns a DMA_STATUS for
software to handle it. But there's no way to indicate the software has
handled all RX descriptors and the whole pipeline stalls.

We do something similar to NPCM7XX EMC to handle this case.

1. Return packet size when RX descriptor is full, effectively dropping
these packets in such a case.
2. When software clears RX descriptor full bit, continue receiving
further packets by flushing QEMU packet queue.

Added relevant trace-events

Change-Id: I132aa254a94cda1a586aba2ea33bbfc74ecdb831
Signed-off-by: Hao Wu <wuhaotsh@google.com>
Signed-off-by: Nabih Estefan <nabihestefan@google.com>
Reviewed-by: Tyrone Ting <kfting@nuvoton.com>
Message-id: 20240131002800.989285-5-nabihestefan@google.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Nabih Estefan Diaz 2024-01-31 00:27:57 +00:00 • committed by Peter Maydell
parent 327b680877
commit a4dd7a1dad
2 changed files with 279 additions and 2 deletions
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5
hw/net/trace-events
View file

@ -474,6 +474,11 @@ npcm_gmac_mdio_access(const char *name, uint8_t is_write, uint8_t pa, uint8_t gr
npcm_gmac_reset(const char *name, uint16_t value) "%s: phy_regs[0][1]: 0x%04" PRIx16
npcm_gmac_set_link(bool active) "Set link: active=%u"
npcm_gmac_update_irq(const char *name, uint32_t status, uint32_t intr_en, int level) "%s: Status Reg: 0x%04" PRIX32 " Interrupt Enable Reg: 0x%04" PRIX32 " IRQ Set: %d"
npcm_gmac_packet_desc_read(const char* name, uint32_t desc_addr) "%s: attempting to read descriptor @0x%04" PRIX32
npcm_gmac_packet_receive(const char* name, uint32_t len) "%s: RX packet length: 0x%04" PRIX32
npcm_gmac_packet_receiving_buffer(const char* name, uint32_t buf_len, uint32_t rx_buf_addr) "%s: Receiving into Buffer size: 0x%04" PRIX32 " at address 0x%04" PRIX32
npcm_gmac_packet_received(const char* name, uint32_t len) "%s: Reception finished, packet left: 0x%04" PRIX32
npcm_gmac_debug_desc_data(const char* name, void* addr, uint32_t des0, uint32_t des1, uint32_t des2, uint32_t des3)"%s: Address: %p Descriptor 0: 0x%04" PRIX32 " Descriptor 1: 0x%04" PRIX32 "Descriptor 2: 0x%04" PRIX32 " Descriptor 3: 0x%04" PRIX32
# npcm_pcs.c
npcm_pcs_reg_read(const char *name, uint16_t indirect_access_baes, uint64_t offset, uint16_t value) "%s: IND: 0x%02" PRIx16 " offset: 0x%04" PRIx64 " value: 0x%04" PRIx16