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octeontx2-af: Clear NPC MCAM entries before update

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Writing into NPC MCAM1 and MCAM0 registers are suppressed if
they happened to form a reserved combination. Hence
clear and disable MCAM entries before update.

For HRM:
[CAM(1)]<n>=1, [CAM(0)]<n>=1: Reserved.
The reserved combination is not allowed. Hardware suppresses any
write to CAM(0) or CAM(1) that would result in the reserved combination for
any CAM bit.

Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nithin Dabilpuram 2019-11-14 10:56:27 +05:30 committed by David S. Miller
parent 922584f607
commit 8cc89ae925
1 changed files with 31 additions and 2 deletions
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33
drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
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@ -120,6 +120,31 @@ static void npc_enable_mcam_entry(struct rvu *rvu, struct npc_mcam *mcam,
}
}
static void npc_clear_mcam_entry(struct rvu *rvu, struct npc_mcam *mcam,
int blkaddr, int index)
{
int bank = npc_get_bank(mcam, index);
int actbank = bank;
index &= (mcam->banksize - 1);
for (; bank < (actbank + mcam->banks_per_entry); bank++) {
rvu_write64(rvu, blkaddr,
NPC_AF_MCAMEX_BANKX_CAMX_INTF(index, bank, 1), 0);
rvu_write64(rvu, blkaddr,
NPC_AF_MCAMEX_BANKX_CAMX_INTF(index, bank, 0), 0);
rvu_write64(rvu, blkaddr,
NPC_AF_MCAMEX_BANKX_CAMX_W0(index, bank, 1), 0);
rvu_write64(rvu, blkaddr,
NPC_AF_MCAMEX_BANKX_CAMX_W0(index, bank, 0), 0);
rvu_write64(rvu, blkaddr,
NPC_AF_MCAMEX_BANKX_CAMX_W1(index, bank, 1), 0);
rvu_write64(rvu, blkaddr,
NPC_AF_MCAMEX_BANKX_CAMX_W1(index, bank, 0), 0);
}
}
static void npc_get_keyword(struct mcam_entry *entry, int idx,
u64 *cam0, u64 *cam1)
{
@ -211,6 +236,12 @@ static void npc_config_mcam_entry(struct rvu *rvu, struct npc_mcam *mcam,
actindex = index;
index &= (mcam->banksize - 1);
/* Disable before mcam entry update */
npc_enable_mcam_entry(rvu, mcam, blkaddr, actindex, false);
/* Clear mcam entry to avoid writes being suppressed by NPC */
npc_clear_mcam_entry(rvu, mcam, blkaddr, actindex);
/* CAM1 takes the comparison value and
* CAM0 specifies match for a bit in key being '0' or '1' or 'dontcare'.
* CAM1<n> = 0 & CAM0<n> = 1 => match if key<n> = 0
@ -251,8 +282,6 @@ static void npc_config_mcam_entry(struct rvu *rvu, struct npc_mcam *mcam,
/* Enable the entry */
if (enable)
npc_enable_mcam_entry(rvu, mcam, blkaddr, actindex, true);
else
npc_enable_mcam_entry(rvu, mcam, blkaddr, actindex, false);
}
static void npc_copy_mcam_entry(struct rvu *rvu, struct npc_mcam *mcam,