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octeontx2-af: Do NIX_RX_SW_SYNC twice 

NIX_RX_SW_SYNC ensures all existing transactions are finished and
pkts are written to LLC/DRAM, queues should be teared down after
successful SW_SYNC. Due to a HW errata, in some rare scenarios
an existing transaction might end after SW_SYNC operation. To
ensure operation is fully done, do the SW_SYNC twice.

Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sunil Goutham 2021-07-25 18:54:52 +05:30 committed by David S. Miller
parent 758684e49f
commit fcef709c2c
1 changed files with 13 additions and 2 deletions
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15
drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
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@ -196,11 +196,22 @@ static void nix_rx_sync(struct rvu *rvu, int blkaddr)
{ {
int err; int err;
/*Sync all in flight RX packets to LLC/DRAM */ /* Sync all in flight RX packets to LLC/DRAM */
rvu_write64(rvu, blkaddr, NIX_AF_RX_SW_SYNC, BIT_ULL(0)); rvu_write64(rvu, blkaddr, NIX_AF_RX_SW_SYNC, BIT_ULL(0));
err = rvu_poll_reg(rvu, blkaddr, NIX_AF_RX_SW_SYNC, BIT_ULL(0), true); err = rvu_poll_reg(rvu, blkaddr, NIX_AF_RX_SW_SYNC, BIT_ULL(0), true);
if (err) if (err)
dev_err(rvu->dev, "NIX RX software sync failed\n"); dev_err(rvu->dev, "SYNC1: NIX RX software sync failed\n");
/* SW_SYNC ensures all existing transactions are finished and pkts
* are written to LLC/DRAM, queues should be teared down after
* successful SW_SYNC. Due to a HW errata, in some rare scenarios
* an existing transaction might end after SW_SYNC operation. To
* ensure operation is fully done, do the SW_SYNC twice.
*/
rvu_write64(rvu, blkaddr, NIX_AF_RX_SW_SYNC, BIT_ULL(0));
err = rvu_poll_reg(rvu, blkaddr, NIX_AF_RX_SW_SYNC, BIT_ULL(0), true);
if (err)
dev_err(rvu->dev, "SYNC2: NIX RX software sync failed\n");
} }
static bool is_valid_txschq(struct rvu *rvu, int blkaddr, static bool is_valid_txschq(struct rvu *rvu, int blkaddr,