d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Add Rx offsets support for the ENA driver

Browse Source 
For the first descriptor in a chain the data may start at an offset.
It is optional feature of some devices, so the driver must ack that
it supports it.

The data pointer of the mbuf is simply shifted by the given value.

Submitted by:   Maciej Bielski <mba@semihalf.com>
Submitted by:   Michal Krawczyk <mk@semihalf.com>
Obtained from:  Semihalf
Sponsored by:   Amazon, Inc
MFC after:      1 week
Differential revision:  https://reviews.freebsd.org/D27116
This commit is contained in:
Marcin Wojtas 2020-11-18 15:02:12 +00:00
parent 9eb1615f33
commit c74443892c
2 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sys/dev/ena/ena.c
View File

@ -2797,6 +2797,8 @@ ena_config_host_info(struct ena_com_dev *ena_dev, device_t dev)
(DRV_MODULE_VER_MINOR << ENA_ADMIN_HOST_INFO_MINOR_SHIFT) |
(DRV_MODULE_VER_SUBMINOR << ENA_ADMIN_HOST_INFO_SUB_MINOR_SHIFT);
host_info->num_cpus = mp_ncpus;
host_info->driver_supported_features =
ENA_ADMIN_HOST_INFO_RX_OFFSET_MASK;
rc = ena_com_set_host_attributes(ena_dev);
if (unlikely(rc != 0)) {

6
sys/dev/ena/ena_datapath.c
View File

@ -431,6 +431,10 @@ ena_rx_mbuf(struct ena_ring *rx_ring, struct ena_com_rx_buf_info *ena_bufs,
mbuf->m_flags |= M_PKTHDR;
mbuf->m_pkthdr.len = len;
mbuf->m_len = len;
// Only for the first segment the data starts at specific offset
mbuf->m_data = mtodo(mbuf, ena_rx_ctx->pkt_offset);
ena_trace(NULL, ENA_DBG | ENA_RXPTH,
"Mbuf data offset=%u\n", ena_rx_ctx->pkt_offset);
mbuf->m_pkthdr.rcvif = rx_ring->que->adapter->ifp;
/* Fill mbuf with hash key and it's interpretation for optimization */
@ -575,6 +579,8 @@ ena_rx_cleanup(struct ena_ring *rx_ring)
ena_rx_ctx.ena_bufs = rx_ring->ena_bufs;
ena_rx_ctx.max_bufs = adapter->max_rx_sgl_size;
ena_rx_ctx.descs = 0;
ena_rx_ctx.pkt_offset = 0;
bus_dmamap_sync(io_cq->cdesc_addr.mem_handle.tag,
io_cq->cdesc_addr.mem_handle.map, BUS_DMASYNC_POSTREAD);
rc = ena_com_rx_pkt(io_cq, io_sq, &ena_rx_ctx);