lwIP | Draft: MR for GRETH lwIP Port GSoC 2025 (!22)

Fri Jun 13 16:29:08 UTC 2025

Prithvi Tambewagh commented: https://gitlab.rtems.org/rtems/pkg/rtems-lwip/-/merge_requests/22#note_124593

Today I have added function for buffer initialization, can you please have a look and provide feedback? Some key things I considered :

1. I used same struct `emac_bd` for both transmit and receive descriptors since they share same fields
2. I added fields `num_tx_bd` and `num_rx_bd` in struct `greth_netif_struct` for setting number of buffer descriptors for tx and rx separately (analogus struct to struct `tms570_netif_state`)
3. I increased size of `buffptr` in `emac_bd` struct from 8 bit to 32 bit since thats what was used in GRETH Legacy Driver
4. For Non-Gigabit MACs, I have allocated maximum possible packet buffer memory using `malloc(GRETH_MAXBUF_LEN)`
5. Used variables `all_txbd_size` and `all_rxbd_size` for total memory required for tx and tx buffer descriptors respectively

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-lwip/-/merge_requests/22#note_124593
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