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nvethernetrm: Zero initialize all descriptors

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Issue: Tx/Rx DMA initialization in OSI does not actually
       zero initialize all the descriptors. This inherently
       assumes that the OSD layer would already zero initialize
       the memory allocated for descriptors, which need not be
       the case for all OSD's as this requirement isn't
       called out.

Fix:   Instead of relying on OSD to zero initialize the
       descriptors, perform initialization in OSI during DMA
       init operation. It is one time cost at init, so no
       performance penalty in data path.

Bug 2779959

Change-Id: I39431184980fceeb836eca872491ac8d7ee029ca
Signed-off-by: Srinivas Ramachandran <srinivasra@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2259541
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Bhadram Varka <vbhadram@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Narayan Reddy <narayanr@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Srinivas Ramachandran
2019-12-10 12:13:23 -08:00
committed by mobile promotions
parent 0bd3dc4135
commit e95c46f86c
1 changed files with 15 additions and 8 deletions
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15
osi/dma/osi_dma_txrx.c
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@@ -782,6 +782,12 @@ static int rx_dma_desc_initialization(struct osi_dma_priv_data *osi,
rx_swcx = rx_ring->rx_swcx + i;
rx_desc = rx_ring->rx_desc + i;
/* Zero initialize the descriptors first */
rx_desc->rdes0 = 0;
rx_desc->rdes1 = 0;
rx_desc->rdes2 = 0;
rx_desc->rdes3 = 0;
tmp = L32(rx_swcx->buf_phy_addr);
if (tmp < UINT_MAX) {
rx_desc->rdes0 = (unsigned int)tmp;
@@ -867,19 +873,20 @@ static void tx_dma_desc_init(struct osi_dma_priv_data *osi_dma)
struct osi_tx_desc *tx_desc = OSI_NULL;
struct osi_dma_chan_ops *ops = osi_dma->ops;
unsigned int chan = 0;
unsigned int i;
unsigned int i, j;
for (i = 0; i < osi_dma->num_dma_chans; i++) {
chan = osi_dma->dma_chans[i];
tx_ring = osi_dma->tx_ring[chan];
tx_desc = tx_ring->tx_desc;
/* FIXME: does it require */
for (j = 0; j < TX_DESC_CNT; j++) {
tx_desc = tx_ring->tx_desc + j;
tx_desc->tdes0 = 0;
tx_desc->tdes1 = 0;
tx_desc->tdes2 = 0;
tx_desc->tdes3 = 0;
}
tx_ring->cur_tx_idx = 0;
tx_ring->clean_idx = 0;