Re: [PATCH v3 net-next 04/13] octeontx2-af: Add mbox messages to install and delete MCAM rules

From: Naveen Mamindlapalli
Date: Sat Nov 14 2020 - 13:52:49 EST

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Hi Alexander,

Thanks for the review.

> -----Original Message-----
> From: Alexander Duyck <alexander.duyck@xxxxxxxxx>
> Sent: Friday, November 13, 2020 3:17 AM
> To: Naveen Mamindlapalli <naveenm@xxxxxxxxxxx>
> Cc: Netdev <netdev@xxxxxxxxxxxxxxx>; LKML <linux-kernel@xxxxxxxxxxxxxxx>;
> Jakub Kicinski <kuba@xxxxxxxxxx>; David Miller <davem@xxxxxxxxxxxxx>;
> saeed@xxxxxxxxxx; Sunil Kovvuri Goutham <sgoutham@xxxxxxxxxxx>; Linu
> Cherian <lcherian@xxxxxxxxxxx>; Geethasowjanya Akula
> <gakula@xxxxxxxxxxx>; Jerin Jacob Kollanukkaran <jerinj@xxxxxxxxxxx>;
> Subbaraya Sundeep Bhatta <sbhatta@xxxxxxxxxxx>; Hariprasad Kelam
> <hkelam@xxxxxxxxxxx>
> Subject: Re: [PATCH v3 net-next 04/13] octeontx2-af: Add mbox messages
> to install and delete MCAM rules
>
> On Tue, Nov 10, 2020 at 11:22 PM Naveen Mamindlapalli
> <naveenm@xxxxxxxxxxx> wrote:
> >
> > From: Subbaraya Sundeep <sbhatta@xxxxxxxxxxx>
> >
> > Added new mailbox messages to install and delete MCAM rules.
> > These mailbox messages will be used for adding/deleting ethtool
> > n-tuple filters by NIX PF. The installed MCAM rules are stored in a
> > list that will be traversed later to delete the MCAM entries when the
> > interface is brought down or when PCIe FLR is received.
> > The delete mailbox supports deleting a single MCAM entry or range of
> > entries or all the MCAM entries owned by the pcifunc. Each MCAM entry
> > can be associated with a HW match stat entry if the mailbox requester
> > wants to check the hit count for debugging.
> >
> > Modified adding default unicast DMAC match rule using install flow
> > API. The default unicast DMAC match entry installed by Administrative
> > Function is saved and can be changed later by the mailbox user to fit
> > additional fields, or the default MCAM entry rule action can be used
> > for other flow rules installed later.
> >
> > Modified rvu_mbox_handler_nix_lf_free mailbox to add a flag to disable
> > or delete the MCAM entries. The MCAM entries are disabled when the
> > interface is brought down and deleted in FLR handler.
> > The disabled MCAM entries will be re-enabled when the interface is
> > brought up again.
> >
> > Signed-off-by: Subbaraya Sundeep <sbhatta@xxxxxxxxxxx>
> > Signed-off-by: Sunil Goutham <sgoutham@xxxxxxxxxxx>
> > Signed-off-by: Naveen Mamindlapalli <naveenm@xxxxxxxxxxx>
>
> A couple minor issues to address, called out in comments below.
>
> > ---
> > drivers/net/ethernet/marvell/octeontx2/af/common.h | 2 +
> > drivers/net/ethernet/marvell/octeontx2/af/mbox.h | 76 ++-
> > drivers/net/ethernet/marvell/octeontx2/af/npc.h | 57 +-
> > drivers/net/ethernet/marvell/octeontx2/af/rvu.h | 13 +
> > .../net/ethernet/marvell/octeontx2/af/rvu_nix.c | 19 +-
> > .../net/ethernet/marvell/octeontx2/af/rvu_npc.c | 217 ++++++-
> > .../net/ethernet/marvell/octeontx2/af/rvu_npc_fs.c | 721
> +++++++++++++++++++++
> > .../net/ethernet/marvell/octeontx2/nic/otx2_pf.c | 12 +-
> > 8 files changed, 1065 insertions(+), 52 deletions(-)
> >
>
> <snip>
>
> > diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
> > b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
> > index eb4eaa7ece3a..a7759ecfa586 100644
> > --- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
> > +++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
> > @@ -219,7 +219,7 @@ static int npc_get_nixlf_mcam_index(struct
> npc_mcam *mcam,
> > return npc_get_ucast_mcam_index(mcam, pcifunc, nixlf); }
> >
> > -static int npc_get_bank(struct npc_mcam *mcam, int index)
> > +int npc_get_bank(struct npc_mcam *mcam, int index)
> > {
> > int bank = index / mcam->banksize;
> >
> > @@ -241,8 +241,8 @@ static bool is_mcam_entry_enabled(struct rvu *rvu,
> struct npc_mcam *mcam,
> > return (cfg & 1);
> > }
> >
> > -static void npc_enable_mcam_entry(struct rvu *rvu, struct npc_mcam
> *mcam,
> > - int blkaddr, int index, bool enable)
> > +void npc_enable_mcam_entry(struct rvu *rvu, struct npc_mcam *mcam,
> > + int blkaddr, int index, bool enable)
> > {
> > int bank = npc_get_bank(mcam, index);
> > int actbank = bank;
> > @@ -359,6 +359,41 @@ static void npc_get_keyword(struct mcam_entry
> *entry, int idx,
> > *cam0 = ~*cam1 & kw_mask;
> > }
> >
> > +static void npc_get_default_entry_action(struct rvu *rvu, struct npc_mcam
> *mcam,
> > + int blkaddr, int index,
> > + struct mcam_entry *entry) {
> > + u16 owner, target_func;
> > + struct rvu_pfvf *pfvf;
> > + int bank, nixlf;
> > + u64 rx_action;
> > +
> > + owner = mcam->entry2pfvf_map[index];
> > + target_func = (entry->action >> 4) & 0xffff;
> > + /* return incase target is PF or LBK or rule owner is not PF */
> > + if (is_afvf(target_func) || (owner & RVU_PFVF_FUNC_MASK) ||
> > + !(target_func & RVU_PFVF_FUNC_MASK))
> > + return;
> > +
> > + pfvf = rvu_get_pfvf(rvu, target_func);
> > + mcam->entry2target_pffunc[index] = target_func;
> > + /* return if nixlf is not attached or initialized */
> > + if (!is_nixlf_attached(rvu, target_func) || !pfvf->def_ucast_rule)
> > + return;
> > +
> > + /* get VF ucast entry rule */
> > + nix_get_nixlf(rvu, target_func, &nixlf, NULL);
> > + index = npc_get_nixlf_mcam_index(mcam, target_func,
> > + nixlf, NIXLF_UCAST_ENTRY);
> > + bank = npc_get_bank(mcam, index);
> > + index &= (mcam->banksize - 1);
> > +
> > + rx_action = rvu_read64(rvu, blkaddr,
> > + NPC_AF_MCAMEX_BANKX_ACTION(index, bank));
> > + if (rx_action)
> > + entry->action = rx_action; }
> > +
> > static void npc_config_mcam_entry(struct rvu *rvu, struct npc_mcam *mcam,
> > int blkaddr, int index, u8 intf,
> > struct mcam_entry *entry, bool
> > enable) @@ -406,6 +441,11 @@ static void npc_config_mcam_entry(struct
> rvu *rvu, struct npc_mcam *mcam,
> > NPC_AF_MCAMEX_BANKX_CAMX_W1(index, bank, 0), cam0);
> > }
> >
> > + /* copy VF default entry action to the VF mcam entry */
> > + if (intf == NIX_INTF_RX && actindex < mcam->bmap_entries)
> > + npc_get_default_entry_action(rvu, mcam, blkaddr, actindex,
> > + entry);
> > +
> > /* Set 'action' */
> > rvu_write64(rvu, blkaddr,
> > NPC_AF_MCAMEX_BANKX_ACTION(index, actbank),
> > entry->action); @@ -473,11 +513,12 @@ void
> rvu_npc_install_ucast_entry(struct rvu *rvu, u16 pcifunc,
> > int nixlf, u64 chan, u8 *mac_addr) {
> > struct rvu_pfvf *pfvf = rvu_get_pfvf(rvu, pcifunc);
> > + u8 mac_mask[] = { [0 ... ETH_ALEN] = 0xFF };
>
> Is this supposed to be a 7 byte long array? I assume that is what is
> meant by the 0 ... ETH_ALEN which would imply it covers entries 0 - 6.
> This might be better as:
> u8 mac_mask[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };

I will use eth_broadcast_addr() to avoid this variable.

>
> > + struct npc_install_flow_req req = { 0 };
> > + struct npc_install_flow_rsp rsp = { 0 };
> > struct npc_mcam *mcam = &rvu->hw->mcam;
>
> Since the mcam line is longer normally it should be before the 2 new
> lines in order to maintain the reverse xmas tree format.

This looks like my outlook email client issue. I don't see any problem with vim.

>
> > - struct mcam_entry entry = { {0} };
> > struct nix_rx_action action;
> > - int blkaddr, index, kwi;
> > - u64 mac = 0;
> > + int blkaddr, index;
> >
> > /* AF's VFs work in promiscuous mode */
> > if (is_afvf(pcifunc))
> > @@ -487,20 +528,9 @@ void rvu_npc_install_ucast_entry(struct rvu *rvu, u16
> pcifunc,
> > if (blkaddr < 0)
> > return;
> >
> > - for (index = ETH_ALEN - 1; index >= 0; index--)
> > - mac |= ((u64)*mac_addr++) << (8 * index);
> > -
> > index = npc_get_nixlf_mcam_index(mcam, pcifunc,
> > nixlf, NIXLF_UCAST_ENTRY);
> >
> > - /* Match ingress channel and DMAC */
> > - entry.kw[0] = chan;
> > - entry.kw_mask[0] = 0xFFFULL;
> > -
> > - kwi = NPC_PARSE_RESULT_DMAC_OFFSET / sizeof(u64);
> > - entry.kw[kwi] = mac;
> > - entry.kw_mask[kwi] = BIT_ULL(48) - 1;
> > -
> > /* Don't change the action if entry is already enabled
> > * Otherwise RSS action may get overwritten.
> > */
> > @@ -513,20 +543,20 @@ void rvu_npc_install_ucast_entry(struct rvu *rvu,
> u16 pcifunc,
> > action.pf_func = pcifunc;
> > }
> >
> > - entry.action = *(u64 *)&action;
> > - npc_config_mcam_entry(rvu, mcam, blkaddr, index,
> > - pfvf->nix_rx_intf, &entry, true);
> > -
> > - /* add VLAN matching, setup action and save entry back for later */
> > - entry.kw[0] |= (NPC_LT_LB_STAG_QINQ | NPC_LT_LB_CTAG) << 20;
> > - entry.kw_mask[0] |= (NPC_LT_LB_STAG_QINQ & NPC_LT_LB_CTAG) <<
> 20;
> > + req.default_rule = 1;
> > + ether_addr_copy(req.packet.dmac, mac_addr);
> > + ether_addr_copy(req.mask.dmac, mac_mask);
>
> If this is all you were using the mac_mask for you could probably just
> use a memset here to achieve the same thing and save yourself the
> trouble of allocating the mac_mask. See eth_broadcast_addr().

I will update the code to use eth_broadcast_addr() and send in v4.

>
> > + req.features = BIT_ULL(NPC_DMAC);
> > + req.channel = chan;
> > + req.intf = pfvf->nix_rx_intf;
> > + req.op = action.op;
> > + req.hdr.pcifunc = 0; /* AF is requester */
> > + req.vf = action.pf_func;
> > + req.index = action.index;
> > + req.match_id = action.match_id;
> > + req.flow_key_alg = action.flow_key_alg;
> >
> > - entry.vtag_action = VTAG0_VALID_BIT |
> > - FIELD_PREP(VTAG0_TYPE_MASK, 0) |
> > - FIELD_PREP(VTAG0_LID_MASK, NPC_LID_LA) |
> > - FIELD_PREP(VTAG0_RELPTR_MASK, 12);
> > -
> > - memcpy(&pfvf->entry, &entry, sizeof(entry));
> > + rvu_mbox_handler_npc_install_flow(rvu, &req, &rsp);
> > }
> >
>
> <snip>
>
> > +static void npc_update_flow(struct rvu *rvu, struct mcam_entry *entry,
> > + u64 features, struct flow_msg *pkt,
> > + struct flow_msg *mask,
> > + struct rvu_npc_mcam_rule *output, u8 intf)
> > +{
> > + u64 dmac_mask = ether_addr_to_u64(mask->dmac);
> > + u64 smac_mask = ether_addr_to_u64(mask->smac);
> > + u64 dmac_val = ether_addr_to_u64(pkt->dmac);
> > + u64 smac_val = ether_addr_to_u64(pkt->smac);
> > + struct flow_msg *opkt = &output->packet;
> > + struct flow_msg *omask = &output->mask;
> > +
> > + if (!features)
> > + return;
> > +
> > +#define NPC_WRITE_FLOW(field, member, val_lo, val_hi, mask_lo, mask_hi)
> \
> > +do { \
> > + if (features & BIT_ULL((field))) { \
> > + npc_update_entry(rvu, (field), entry, (val_lo), (val_hi), \
> > + (mask_lo), (mask_hi), intf); \
> > + memcpy(&opkt->member, &pkt->member, sizeof(pkt->member)); \
> > + memcpy(&omask->member, &mask->member, sizeof(mask-
> >member)); \
> > + } \
> > +} while (0)
> > +
>
> The placement of this macro seems wierd to me. Either it needs to be
> boe moved before the function declaration, or it should be defined
> where it is used instead of this block above it.

I will move the macro to a block below where it is being used.

>
> > + /* For tcp/udp/sctp LTYPE should be present in entry */
> > + if (features & (BIT_ULL(NPC_SPORT_TCP) | BIT_ULL(NPC_DPORT_TCP)))
> > + npc_update_entry(rvu, NPC_LD, entry, NPC_LT_LD_TCP,
> > + 0, ~0ULL, 0, intf);
> > + if (features & (BIT_ULL(NPC_SPORT_UDP) | BIT_ULL(NPC_DPORT_UDP)))
> > + npc_update_entry(rvu, NPC_LD, entry, NPC_LT_LD_UDP,
> > + 0, ~0ULL, 0, intf);
> > + if (features & (BIT_ULL(NPC_SPORT_SCTP) |
> BIT_ULL(NPC_DPORT_SCTP)))
> > + npc_update_entry(rvu, NPC_LD, entry, NPC_LT_LD_SCTP,
> > + 0, ~0ULL, 0, intf);
> > +
> > + if (features & BIT_ULL(NPC_OUTER_VID))
> > + npc_update_entry(rvu, NPC_LB, entry,
> > + NPC_LT_LB_STAG_QINQ | NPC_LT_LB_CTAG, 0,
> > + NPC_LT_LB_STAG_QINQ & NPC_LT_LB_CTAG, 0, intf);
> > +
> > + NPC_WRITE_FLOW(NPC_DMAC, dmac, dmac_val, 0, dmac_mask, 0);
> > + NPC_WRITE_FLOW(NPC_SMAC, smac, smac_val, 0, smac_mask, 0);
> > + NPC_WRITE_FLOW(NPC_ETYPE, etype, ntohs(pkt->etype), 0,
> > + ntohs(mask->etype), 0);
> > + NPC_WRITE_FLOW(NPC_SIP_IPV4, ip4src, ntohl(pkt->ip4src), 0,
> > + ntohl(mask->ip4src), 0);
> > + NPC_WRITE_FLOW(NPC_DIP_IPV4, ip4dst, ntohl(pkt->ip4dst), 0,
> > + ntohl(mask->ip4dst), 0);
> > + NPC_WRITE_FLOW(NPC_SPORT_TCP, sport, ntohs(pkt->sport), 0,
> > + ntohs(mask->sport), 0);
> > + NPC_WRITE_FLOW(NPC_SPORT_UDP, sport, ntohs(pkt->sport), 0,
> > + ntohs(mask->sport), 0);
> > + NPC_WRITE_FLOW(NPC_DPORT_TCP, dport, ntohs(pkt->dport), 0,
> > + ntohs(mask->dport), 0);
> > + NPC_WRITE_FLOW(NPC_DPORT_UDP, dport, ntohs(pkt->dport), 0,
> > + ntohs(mask->dport), 0);
> > + NPC_WRITE_FLOW(NPC_SPORT_SCTP, sport, ntohs(pkt->sport), 0,
> > + ntohs(mask->sport), 0);
> > + NPC_WRITE_FLOW(NPC_DPORT_SCTP, dport, ntohs(pkt->dport), 0,
> > + ntohs(mask->dport), 0);
> > +
> > + NPC_WRITE_FLOW(NPC_OUTER_VID, vlan_tci, ntohs(pkt->vlan_tci), 0,
> > + ntohs(mask->vlan_tci), 0);
> > +
> > + npc_update_ipv6_flow(rvu, entry, features, pkt, mask, output, intf);
> > +}
> > +

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