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net/thunderx: check data offset alignment requirement

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nicvf HW expects the DMA address of the packet data to be
aligned with cache line size.

Packet data offset is a function of struct mbuf size,
mbuf private size and headroom. mbuf private size can
be changed from the application in pool creation, this
check detects HW alignment requirement constraint in pmd
start function.

Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com>
This commit is contained in:
Jerin Jacob 2017-03-13 13:32:11 +05:30 committed by Ferruh Yigit
parent 0934b7f12a
commit 34c2e7026f
1 changed files with 11 additions and 3 deletions
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14
drivers/net/thunderx/nicvf_ethdev.c
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@ -1410,7 +1410,7 @@ static int
nicvf_vf_start(struct rte_eth_dev *dev, struct nicvf *nic, uint32_t rbdrsz)
{
int ret;
uint16_t qidx;
uint16_t qidx, data_off;
uint32_t total_rxq_desc, nb_rbdr_desc, exp_buffs;
uint64_t mbuf_phys_off = 0;
struct nicvf_rxq *rxq;
@ -1451,10 +1451,18 @@ nicvf_vf_start(struct rte_eth_dev *dev, struct nicvf *nic, uint32_t rbdrsz)
nic->vf_id, qidx, rxq->pool->name);
return -ENOMEM;
}
rxq->mbuf_phys_off -= nicvf_mbuff_meta_length(mbuf);
rxq->mbuf_phys_off -= RTE_PKTMBUF_HEADROOM;
data_off = nicvf_mbuff_meta_length(mbuf);
data_off += RTE_PKTMBUF_HEADROOM;
rte_pktmbuf_free(mbuf);
if (data_off % RTE_CACHE_LINE_SIZE) {
PMD_INIT_LOG(ERR, "%s: unaligned data_off=%d delta=%d",
rxq->pool->name, data_off,
data_off % RTE_CACHE_LINE_SIZE);
return -EINVAL;
}
rxq->mbuf_phys_off -= data_off;
if (mbuf_phys_off == 0)
mbuf_phys_off = rxq->mbuf_phys_off;
if (mbuf_phys_off != rxq->mbuf_phys_off) {