tree 6293d25b2c0ee2d7f4ede7967f44e61a102ea6af
parent a9f852e92e40992c4ff09ac3940f7725e016317a
author Rahul Lakkireddy <rahul.lakkireddy@chelsio.com> 1574384401 +0530
committer Jakub Kicinski <jakub.kicinski@netronome.com> 1574469879 -0800

cxgb4/chcr: update SGL DMA unmap for USO

The FW_ETH_TX_EO_WR used for sending UDP Segmentation Offload (USO)
requests expects the headers to be part of the descriptor and the
payload to be part of the SGL containing the DMA mapped addresses.
Hence, the DMA address in the first entry of the SGL can start after
the packet headers. Currently, unmap_sgl() tries to unmap from this
wrong offset, instead of the originally mapped DMA address.

So, use existing unmap_skb() instead, which takes originally saved DMA
addresses as input. Update all necessary Tx paths to save the original
DMA addresses, so that unmap_skb() can unmap them properly.

v2:
- No change.

Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>