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Message-ID: <BY3PR18MB470774ABED5E4E22DAA4535EA0A89@BY3PR18MB4707.namprd18.prod.outlook.com>
Date: Fri, 24 Feb 2023 08:39:20 +0000
From: Sai Krishna Gajula <saikrishnag@...vell.com>
To: Simon Horman <simon.horman@...igine.com>
CC: "davem@...emloft.net" <davem@...emloft.net>,
"edumazet@...gle.com" <edumazet@...gle.com>,
"kuba@...nel.org" <kuba@...nel.org>,
"pabeni@...hat.com" <pabeni@...hat.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Sunil Kovvuri Goutham <sgoutham@...vell.com>,
Suman Ghosh <sumang@...vell.com>
Subject: Re: [net PATCH v2] octeontx2-af: Unlock contexts in the queue context
cache in case of fault detection
Hi Simon,
> -----Original Message-----
> From: Simon Horman <simon.horman@...igine.com>
> Sent: Thursday, February 23, 2023 6:47 PM
> To: Sai Krishna Gajula <saikrishnag@...vell.com>
> Cc: davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org;
> pabeni@...hat.com; netdev@...r.kernel.org; linux-kernel@...r.kernel.org;
> Sunil Kovvuri Goutham <sgoutham@...vell.com>; Suman Ghosh
> <sumang@...vell.com>
> Subject: Re: [net PATCH v2] octeontx2-af: Unlock contexts in the queue
> context cache in case of fault detection
>
>
> ----------------------------------------------------------------------
> On Thu, Feb 23, 2023 at 04:31:25PM +0530, Sai Krishna wrote:
> > From: Suman Ghosh <sumang@...vell.com>
> >
> > NDC caches contexts of frequently used queue's (Rx and Tx queues)
> > contexts. Due to a HW errata when NDC detects fault/poision while
> > accessing contexts it could go into an illegal state where a cache
> > line could get locked forever. To makesure all cache lines in NDC are
> > available for optimum performance upon fault/lockerror/posion errors
> > scan through all cache lines in NDC and clear the lock bit.
> >
> > Fixes: 4a3581cd5995 ("octeontx2-af: NPA AQ instruction enqueue
> > support")
> > Signed-off-by: Suman Ghosh <sumang@...vell.com>
> > Signed-off-by: Sunil Kovvuri Goutham <sgoutham@...vell.com>
> > Signed-off-by: Sai Krishna <saikrishnag@...vell.com>
>
> ...
>
> > diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu.h
> > b/drivers/net/ethernet/marvell/octeontx2/af/rvu.h
> > index 389663a13d1d..6508f25b2b37 100644
> > --- a/drivers/net/ethernet/marvell/octeontx2/af/rvu.h
> > +++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu.h
> > @@ -884,6 +884,12 @@ int rvu_cpt_lf_teardown(struct rvu *rvu, u16
> > pcifunc, int blkaddr, int lf, int rvu_cpt_ctx_flush(struct rvu *rvu,
> > u16 pcifunc); int rvu_cpt_init(struct rvu *rvu);
> >
> > +/* NDC APIs */
> > +#define NDC_MAX_BANK(rvu, blk_addr) (rvu_read64(rvu, \
> > + blk_addr, NDC_AF_CONST) & 0xFF)
> > +#define NDC_MAX_LINE_PER_BANK(rvu, blk_addr) ((rvu_read64(rvu, \
> > + blk_addr, NDC_AF_CONST) &
> 0xFFFF0000) >> 16)
>
> Perhaps not appropriate to include as part of a fix, as NDC_MAX_BANK is
> being moved from elsewhere, but I wonder if this might be more cleanly
> implemented using FIELD_GET().
We will modify and send a separate patch for all the possible macros that can be replaced by FIELD_GET().
>
> ...
>
> > diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_reg.h
> > b/drivers/net/ethernet/marvell/octeontx2/af/rvu_reg.h
> > index 1729b22580ce..bc6ca5ccc1ff 100644
> > --- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_reg.h
> > +++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_reg.h
> > @@ -694,6 +694,7 @@
> > #define NDC_AF_INTR_ENA_W1S (0x00068)
> > #define NDC_AF_INTR_ENA_W1C (0x00070)
> > #define NDC_AF_ACTIVE_PC (0x00078)
> > +#define NDC_AF_CAMS_RD_INTERVAL (0x00080)
> > #define NDC_AF_BP_TEST_ENABLE (0x001F8)
> > #define NDC_AF_BP_TEST(a) (0x00200 | (a) << 3)
> > #define NDC_AF_BLK_RST (0x002F0)
> > @@ -709,6 +710,8 @@
> > (0x00F00 | (a) << 5 | (b) << 4)
> > #define NDC_AF_BANKX_HIT_PC(a) (0x01000 | (a) << 3)
> > #define NDC_AF_BANKX_MISS_PC(a) (0x01100 | (a) << 3)
> > +#define NDC_AF_BANKX_LINEX_METADATA(a, b) \
> > + (0x10000 | (a) << 3 | (b) << 3)
>
> It looks a little odd that both a and b are shifted by 3 bits.
> If it's intended then perhaps it would be clearer to write this as:
>
> #define NDC_AF_BANKX_LINEX_METADATA(a, b) \
> (0x10000 | ((a) | (b)) << 3)
will send v3 patch.
Thanks,
Sai
>
> >
> > /* LBK */
> > #define LBK_CONST (0x10ull)
> > --
> > 2.25.1
> >
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