On Sun, Jan 26, 2025 at 06:37:14PM +0800, Furong Xu wrote: > The "SPH feature" splits header into buf->page (non-zero offset) and > splits payload into buf->sec_page (zero offset). > > For buf->page, pp_params.max_len should be the size of L3/L4 header, > and with a offset of NET_SKB_PAD. > > For buf->sec_page, pp_params.max_len should be dma_conf->dma_buf_sz, > and with a offset of 0. > > This is always true: > sizeof(L3/L4 header) + NET_SKB_PAD < dma_conf->dma_buf_sz + 0 Thanks, understood, but are there situations where the device is unable to split a packet? For example, a large L2 packet. I am trying to understand if there are situations where the device will write more than "dma_conf->dma_buf_sz - NET_SKB_PAD" to the head buffer.
