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Fix sending TSO packets larger than single DMA segment on VNIC

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Due to the bug in the number of 'GATHER' subdescriptors for TSO
packets, VNIC was not able to transmit more than one DMA segment
with TSO enabled.

Obtained from: Semihalf
Sponsored by:  Cavium
This commit is contained in:
Zbigniew Bodek 2016-04-08 16:14:18 +00:00
parent 368449816e
commit db6eff694c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=297721
1 changed files with 1 additions and 7 deletions
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8
sys/dev/vnic/nicvf_queues.c
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@ -1904,7 +1904,6 @@ static int
nicvf_tx_mbuf_locked(struct snd_queue *sq, struct mbuf **mbufp)
{
bus_dma_segment_t segs[256];
struct nicvf *nic;
struct snd_buff *snd_buff;
size_t seg;
int nsegs, qentry;
@ -1928,12 +1927,7 @@ nicvf_tx_mbuf_locked(struct snd_queue *sq, struct mbuf **mbufp)
}
/* Set how many subdescriptors is required */
nic = sq->nic;
if ((*mbufp)->m_pkthdr.tso_segsz != 0 && nic->hw_tso)
subdesc_cnt = MIN_SQ_DESC_PER_PKT_XMIT;
else
subdesc_cnt = MIN_SQ_DESC_PER_PKT_XMIT + nsegs - 1;
subdesc_cnt = MIN_SQ_DESC_PER_PKT_XMIT + nsegs - 1;
if (subdesc_cnt > sq->free_cnt) {
/* ARM64TODO: Add mbuf defragmentation if we lack descriptors */
bus_dmamap_unload(sq->snd_buff_dmat, snd_buff->dmap);