From: Thomas Falcon
> Sent: 17 October 2017 18:37
> This patch enables scatter gather support. Since there is no
> HW/FW scatter-gather support at this time, the driver needs to
> loop through each fragment and copy it to a contiguous, pre-mapped
> buffer entry.
...
> offset = index * adapter->req_mtu;
> dst = tx_pool->long_term_buff.buff + offset;
You should be able to treat the pre-allocated data area as a
big ring buffer.
So it can hold a lot of small frames or a few big ones.
This slightly complicates the 'is there enough space for
this packet' check since you need buffer space as well
as a ring entry.
You also really want to align each tx buffer on a 4n+2
boundary so that most of the copy is aligned.
> memset(dst, 0, adapter->req_mtu);
Seems unnecessary.
David
