linux-kernel - Re: [net-next PATCH V3 06/12] octeontx2-af: Drop rules for NPC MCAM

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Date:   Thu, 7 Jul 2022 17:54:28 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Ratheesh Kannoth <rkannoth@...vell.com>
Cc:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <sgoutham@...vell.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <pabeni@...hat.com>
Subject: Re: [net-next PATCH V3 06/12] octeontx2-af: Drop rules for NPC MCAM

On Thu, 7 Jul 2022 13:03:47 +0530 Ratheesh Kannoth wrote:
> NPC exact match table installs drop on hit rules in
> NPC mcam for each channel. This rule has broadcast and multicast
> bits cleared. Exact match bit cleared and channel bits
> set. If exact match table hit bit is 0, corresponding NPC mcam
> drop rule will be hit for the packet and will be dropped.

kdoc:

drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_hash.c:1462: warning: bad line:         u8 cgx_id, lmac_id;


clang:

../drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_hash.c:1228:6: warning: variable 'disable_cam' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
        if (entry->cmd)
            ^~~~~~~~~~
../drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_hash.c:1232:6: note: uninitialized use occurs here
        if (disable_cam) {
            ^~~~~~~~~~~
../drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_hash.c:1228:2: note: remove the 'if' if its condition is always true
        if (entry->cmd)
        ^~~~~~~~~~~~~~~
../drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_hash.c:1201:18: note: initialize the variable 'disable_cam' to silence this warning
        bool disable_cam;
                        ^
                         = 0
../drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_hash.c:1308:6: warning: variable 'enable_cam' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
        if (cmd)
            ^~~
../drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_hash.c:1312:6: note: uninitialized use occurs here
        if (enable_cam) {
            ^~~~~~~~~~
../drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_hash.c:1308:2: note: remove the 'if' if its condition is always true
        if (cmd)
        ^~~~~~~~
../drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_hash.c:1275:17: note: initialize the variable 'enable_cam' to silence this warning
        bool enable_cam;
                       ^
                        = 0