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Miller" , Eric Dumazet , Paolo Abeni , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Stanislav Fomichev , kernel-team@cloudflare.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org Subject: Re: [PATCH net-next v3 2/5] bnxt_en: Implement XDP RSS hash metadata extraction Message-ID: References: <20260306230600.1628196-1-carges@cloudflare.com> <20260306230600.1628196-3-carges@cloudflare.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260306230600.1628196-3-carges@cloudflare.com> X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e On Fri, Mar 06, 2026 at 05:00:17PM -0600, Chris J Arges wrote: > Add support for extracting RSS hash values and hash types from hardware > completion descriptors in XDP programs for bnxt_en. > > Add IP_TYPE definition for determining if completion is ipv4 or ipv6. In > addition add ITYPE_ICMP flag for identifying ICMP completions. > > Signed-off-by: Chris J Arges > Reviewed-by: Joe Damato Reviewed-by: Andy Gospodarek > --- > drivers/net/ethernet/broadcom/bnxt/bnxt.c | 5 ++ > drivers/net/ethernet/broadcom/bnxt/bnxt.h | 2 + > drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c | 47 +++++++++++++++++++ > drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h | 3 ++ > 4 files changed, 57 insertions(+) > > diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c > index ab73aad40593..c06033cf9f82 100644 > --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c > +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c > @@ -15906,6 +15906,10 @@ static const struct net_device_ops bnxt_netdev_ops = { > .ndo_hwtstamp_set = bnxt_hwtstamp_set, > }; > > +static const struct xdp_metadata_ops bnxt_xdp_metadata_ops = { > + .xmo_rx_hash = bnxt_xdp_rx_hash, > +}; > + > static void bnxt_get_queue_stats_rx(struct net_device *dev, int i, > struct netdev_queue_stats_rx *stats) > { > @@ -16790,6 +16794,7 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) > goto init_err_free; > > dev->netdev_ops = &bnxt_netdev_ops; > + dev->xdp_metadata_ops = &bnxt_xdp_metadata_ops; > dev->stat_ops = &bnxt_stat_ops; > dev->watchdog_timeo = BNXT_TX_TIMEOUT; > dev->ethtool_ops = &bnxt_ethtool_ops; > diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h > index 90fa3e93c8d6..34bb98709f2b 100644 > --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h > +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h > @@ -232,6 +232,7 @@ struct rx_cmp { > #define RX_CMP_FLAGS_ITYPE_UDP (3 << 12) > #define RX_CMP_FLAGS_ITYPE_FCOE (4 << 12) > #define RX_CMP_FLAGS_ITYPE_ROCE (5 << 12) > + #define RX_CMP_FLAGS_ITYPE_ICMP (7 << 12) > #define RX_CMP_FLAGS_ITYPE_PTP_WO_TS (8 << 12) > #define RX_CMP_FLAGS_ITYPE_PTP_W_TS (9 << 12) > #define RX_CMP_LEN (0xffff << 16) > @@ -311,6 +312,7 @@ struct rx_cmp_ext { > #define RX_CMP_FLAGS2_T_IP_CS_CALC (0x1 << 2) > #define RX_CMP_FLAGS2_T_L4_CS_CALC (0x1 << 3) > #define RX_CMP_FLAGS2_META_FORMAT_VLAN (0x1 << 4) > + #define RX_CMP_FLAGS2_IP_TYPE (0x1 << 8) > __le32 rx_cmp_meta_data; > #define RX_CMP_FLAGS2_METADATA_TCI_MASK 0xffff > #define RX_CMP_FLAGS2_METADATA_VID_MASK 0xfff > diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c > index 85cbeb35681c..1f920464b426 100644 > --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c > +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c > @@ -472,3 +472,50 @@ bnxt_xdp_build_skb(struct bnxt *bp, struct sk_buff *skb, u8 num_frags, > xdp_buff_get_skb_flags(xdp)); > return skb; > } > + > +int bnxt_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash, > + enum xdp_rss_hash_type *rss_type) > +{ > + const struct bnxt_xdp_buff *xdp = (void *)ctx; > + const struct rx_cmp_ext *rxcmp1 = xdp->rxcmp1; > + const struct rx_cmp *rxcmp = xdp->rxcmp; > + enum xdp_rss_hash_type hash_type = 0; > + u32 itypes; > + > + if (!rxcmp || !RX_CMP_HASH_VALID(rxcmp)) > + return -ENODATA; > + > + *hash = le32_to_cpu(rxcmp->rx_cmp_rss_hash); > + > + if (!rxcmp1) { > + *rss_type = XDP_RSS_TYPE_L2; > + return 0; > + } > + > + if (xdp->cmp_type == CMP_TYPE_RX_L2_CMP) { > + itypes = RX_CMP_ITYPES(rxcmp); > + if (rxcmp1->rx_cmp_flags2 & > + cpu_to_le32(RX_CMP_FLAGS2_IP_TYPE)) { > + hash_type |= XDP_RSS_TYPE_L3_IPV6; > + } else { > + hash_type |= XDP_RSS_TYPE_L3_IPV4; > + } > + > + switch (itypes) { > + case RX_CMP_FLAGS_ITYPE_TCP: > + hash_type |= XDP_RSS_L4 | XDP_RSS_L4_TCP; > + break; > + case RX_CMP_FLAGS_ITYPE_UDP: > + hash_type |= XDP_RSS_L4 | XDP_RSS_L4_UDP; > + break; > + case RX_CMP_FLAGS_ITYPE_ICMP: > + hash_type |= XDP_RSS_L4 | XDP_RSS_L4_ICMP; > + break; > + default: > + break; > + } > + } > + > + *rss_type = hash_type; > + return 0; > +} > diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h > index 8c66698bde11..fb4f9143929f 100644 > --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h > +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h > @@ -41,4 +41,7 @@ void bnxt_xdp_buff_frags_free(struct bnxt_rx_ring_info *rxr, > struct sk_buff *bnxt_xdp_build_skb(struct bnxt *bp, struct sk_buff *skb, > u8 num_frags, struct bnxt_rx_ring_info *rxr, > struct xdp_buff *xdp); > +int bnxt_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash, > + enum xdp_rss_hash_type *rss_type); > + > #endif