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Dec 2019 09:13:09 +0000 To: Somnath Kotur CC: dev , Ferruh Yigit , Olivier Matz , Hemant Agrawal , "Sachin Saxena" References: <20191216031647.7750-1-somnath.kotur@broadcom.com> <68e1721c-4051-0451-185d-39344a026a38@solarflare.com> From: Andrew Rybchenko Autocrypt: addr=arybchenko@solarflare.com; keydata= mQINBF2681gBEACbdTxu8eLL3UX2oAelsnK9GkeaJeUYSOHPJQpV7RL/iaIskqTwBRnhjXt7 j9UEwGA+omnOmqQMpeQTb/F9Ma2dYE+Hw4/t/1KVjxr3ehFaASvwR4fWJfO4e2l/Rk4rG6Yi 5r6CWU2y8su2654Fr8KFc+cMGOAgKoZTZHZsRy5lHpMlemeF+VZkv8L5sYJWPnsypgqlCG3h v6lbtfZs+QqYbFH6bqoZwBAl5irmxywGR7ZJr1GLUZZ1lfdazSY8r6Vz0/Ip/KVxGu2uxo81 QCsAj0ZsQtwji9Sds/prTiPrIjx8Fc/tfbnAuVuPcnPbczwCJACzQr4q26XATL3kVuZhSBWh 4XfO/EAUuEq5AemUG5DDTM87g7Lp4eT9gMZB6P+rJwWPNWTiV3L7Cn+fO+l9mTPnOqdzBgDe OaulKiNSft1o0DY4bGzOmM2ad2cZt0jfnbMPMTE9zsr6+RFa+M8Ct20o6U1MUE4vP6veErMK of4kZ8PdoMM+Sq1hxMPNtlcVBSP9xMmdSZPlfDYI5VWosOceEcz7XZdjBJKdwKuz70V7eac4 ITSxgNFCTbeJ03zL2MR5s0IvD9ghISAwZ6ieCjU5UATn5+63qpD0nVNLsAdb/UpfvQcKAmvj 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10--9.395800-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.5.1010-25106.003 X-MDID: 1576487597-y5XcBHSvgJg3 Subject: Re: [dpdk-dev] [RFC PATCH] mbuf: fix to update documentation of PKT_RX_QINQ_STRIPPED X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 12/16/19 11:47 AM, Somnath Kotur wrote: > On Mon, Dec 16, 2019 at 12:01 PM Andrew Rybchenko > wrote: >> >> On 12/16/19 6:16 AM, Somnath Kotur wrote: >>> Certain hardware may be able to strip and/or save only the outermost >>> VLAN instead of both the VLANs in the mbuf in a QinQ scenario. >>> To handle such cases, we could re-interpret setting of just PKT_RX_QINQ_STRIPPED >>> to indicate that only the outermost VLAN has been stripped by the hardware and >>> saved in mbuf->vlan_tci_outer. >>> Only When both PKT_RX_QINQ_STRIPPED and PKT_RX_VLAN_STRIPPED are set, the 2 vlans >>> have been stripped by the hardware and their tci are saved in mbuf->vlan_tci (inner) >>> and mbuf->vlan_tci_outer (outer). >>> >>> Signed-off-by: Somnath Kotur >>> Signed-off-by: JP Lee >>> --- >>> lib/librte_mbuf/rte_mbuf_core.h | 15 +++++++++++---- >>> 1 file changed, 11 insertions(+), 4 deletions(-) >>> >>> diff --git a/lib/librte_mbuf/rte_mbuf_core.h b/lib/librte_mbuf/rte_mbuf_core.h >>> index 9a8557d..db1070b 100644 >>> --- a/lib/librte_mbuf/rte_mbuf_core.h >>> +++ b/lib/librte_mbuf/rte_mbuf_core.h >>> @@ -124,12 +124,19 @@ >>> #define PKT_RX_FDIR_FLX (1ULL << 14) >>> >>> /** >>> - * The 2 vlans have been stripped by the hardware and their tci are >>> - * saved in mbuf->vlan_tci (inner) and mbuf->vlan_tci_outer (outer). >>> + * The outer vlan has been stripped by the hardware and their tci are >>> + * saved in mbuf->vlan_tci_outer (outer). >>> * This can only happen if vlan stripping is enabled in the RX >>> * configuration of the PMD. >>> - * When PKT_RX_QINQ_STRIPPED is set, the flags (PKT_RX_VLAN | >>> - * PKT_RX_VLAN_STRIPPED | PKT_RX_QINQ) must also be set. >>> + * When PKT_RX_QINQ_STRIPPED is set, the flags (PKT_RX_VLAN | PKT_RX_QINQ) >>> + * must also be set. >>> + * When both PKT_RX_QINQ_STRIPPED and PKT_RX_VLAN_STRIPPED are set, the 2 vlans >>> + * have been stripped by the hardware and their tci are saved in >>> + * mbuf->vlan_tci (inner) and mbuf->vlan_tci_outer (outer). >>> + * This can only happen if vlan stripping is enabled in the RX configuration >>> + * of the PMD. >>> + * When PKT_RX_QINQ_STRIPPED and PKT_RX_VLAN_STRIPPED are set, >>> + * (PKT_RX_VLAN | PKT_RX_QINQ) must also be set. >>> */ >>> #define PKT_RX_QINQ_STRIPPED (1ULL << 15) >>> >> >> I always thought that PKT_RX_VLAN_STRIPPED means *one* VLAN >> stripped regardless if it is outer (if the packet is double >> tagged) or inner (if only one VLAN tag was present). >> >> That's why PKT_RX_QINQ_STRIPPED description says that *two* >> VLANs have been stripped. >> >> What is the problem with such approach? > The problem is that RX_VLAN_STRIPPED implies that the stripped VLAN > (outer or inner) is saved in mbuf->vlan_tci, correct? Yes. > There is no way to convey that it is in QinQ mode and yet only outer > VLAN has been stripped and saved in mbuf->vlan_tci_outer ? Ah, it looks like I understand now that the problem is in PKT_RX_QINQ description which claims that TCI is saved in mbuf->vlan_tci_outer and PKT_RX_QINQ_STRIPPED means that both VLAN tags are stripped regardless (PKT_RX_VLAN_STRIPPED). Moreover PKT_RX_QINQ_STRIPPED requires PKT_RX_VLAN_STRIPPED. It means that PKT_RX_QINQ_STRIPPED, PKT_RX_QINQ, PKT_RX_VLAN and PKT_RX_VLAN_STRIPPED must be clarified. I'm not sure, but it looks like it could affect net/dpaa2, so I'm including driver maintainers in CC.