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Mon, 12 Oct 2020 16:04:29 +0000 From: "Wang, Haiyue" To: "Ananyev, Konstantin" , "Power, Ciara" , "dev@dpdk.org" CC: "Zhao1, Wei" , "Guo, Jia" Thread-Topic: [PATCH v3 11/18] net/ixgbe: add checks for max SIMD bitwidth Thread-Index: AQHWlyrQ+9L43nHRjUSWL5f7XEr8jqmQ3VfggAIw0oCAADFtkIAAgNoAgAByjuA= Date: Mon, 12 Oct 2020 16:04:29 +0000 Message-ID: References: <20200807155859.63888-1-ciara.power@intel.com> <20200930130415.11211-1-ciara.power@intel.com> <20200930130415.11211-12-ciara.power@intel.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-reaction: no-action dlp-version: 11.5.1.3 authentication-results: intel.com; dkim=none (message not signed) header.d=none;intel.com; dmarc=none action=none header.from=intel.com; x-originating-ip: [192.198.147.211] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 1e2d8f8e-e8d5-4365-d5f0-08d86ec8801e x-ms-traffictypediagnostic: BN6PR11MB0033: x-ld-processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8273; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BN8PR11MB3795.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 1e2d8f8e-e8d5-4365-d5f0-08d86ec8801e X-MS-Exchange-CrossTenant-originalarrivaltime: 12 Oct 2020 16:04:29.2445 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: mwK7WBTTawX1NwMqd543QJEoK8uNg325kJtYpPxAiNeKwVtfFqES/zkTJ16VUwthsoRKyH70QnNSGGXTfAFLWw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR11MB0033 X-OriginatorOrg: intel.com Subject: Re: [dpdk-dev] [PATCH v3 11/18] net/ixgbe: add checks for max SIMD bitwidth 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" > -----Original Message----- > From: Ananyev, Konstantin > Sent: Monday, October 12, 2020 17:09 > To: Wang, Haiyue ; Power, Ciara ; dev@dpdk.org > Cc: Zhao1, Wei ; Guo, Jia > Subject: RE: [PATCH v3 11/18] net/ixgbe: add checks for max SIMD bitwidth >=20 > > > > > From: Power, Ciara > > > > > Sent: Wednesday, September 30, 2020 21:04 > > > > > To: dev@dpdk.org > > > > > Cc: Power, Ciara ; Zhao1, Wei ; Guo, Jia > > > > > ; Wang, Haiyue > > > > > Subject: [PATCH v3 11/18] net/ixgbe: add checks for max SIMD bitw= idth > > > > > > > > > > When choosing a vector path to take, an extra condition must be > > > > > satisfied to ensure the max SIMD bitwidth allows for the CPU enab= led > > > > > path. > > > > > > > > > > Cc: Wei Zhao > > > > > Cc: Jeff Guo > > > > > > > > > > Signed-off-by: Ciara Power > > > > > --- > > > > > drivers/net/ixgbe/ixgbe_rxtx.c | 7 +++++-- > > > > > 1 file changed, 5 insertions(+), 2 deletions(-) > > > > > > > > > > diff --git a/drivers/net/ixgbe/ixgbe_rxtx.c b/drivers/net/ixgbe/i= xgbe_rxtx.c > > > > > index 977ecf5137..eadc7183f2 100644 > > > > > --- a/drivers/net/ixgbe/ixgbe_rxtx.c > > > > > +++ b/drivers/net/ixgbe/ixgbe_rxtx.c > > > > > @@ -2503,7 +2503,9 @@ ixgbe_set_tx_function(struct rte_eth_dev *d= ev, struct ixgbe_tx_queue > *txq) > > > > > dev->tx_pkt_prepare =3D NULL; > > > > > if (txq->tx_rs_thresh <=3D RTE_IXGBE_TX_MAX_FREE_BUF_SZ && > > > > > (rte_eal_process_type() !=3D RTE_PROC_PRIMARY || > > > > > - ixgbe_txq_vec_setup(txq) =3D=3D 0)) { > > > > > + ixgbe_txq_vec_setup(txq) =3D=3D 0) && > > > > > + rte_get_max_simd_bitwidth() > > > > > > > > As Konstantin mentioned: " I think it is a bit safer to do all chec= ks first before > > > > doing txq_vec_setup()." > > > > > > > > Fox x86 & arm platforms, the setup is always 0, since 'sw_ring_v' i= s union with > > > > 'sw_ring' which is initialize at 'ixgbe_dev_tx_queue_setup'. > > > > > > > > union { > > > > struct ixgbe_tx_entry *sw_ring; /**< address of SW ring for scala= r PMD. */ > > > > struct ixgbe_tx_entry_v *sw_ring_v; /**< address of SW ring for v= ector PMD */ > > > > }; > > > > > > > > static inline int > > > > ixgbe_txq_vec_setup_default(struct ixgbe_tx_queue *txq, > > > > const struct ixgbe_txq_ops *txq_ops) > > > > { > > > > if (txq->sw_ring_v =3D=3D NULL) > > > > return -1; > > > > > > > > /* leave the first one for overflow */ > > > > txq->sw_ring_v =3D txq->sw_ring_v + 1; > > > > txq->ops =3D txq_ops; > > > > > > > > return 0; > > > > } > > > > > > > > So we need check the SIMD bitwidth firstly to avoid changing the sw= _ring* pointer address. > > > > > > > > > > > > Also, looks like we need to add check on: > > > > > > > > int > > > > ixgbe_dev_tx_done_cleanup(void *tx_queue, uint32_t free_cnt) > > > > { > > > > struct ixgbe_tx_queue *txq =3D (struct ixgbe_tx_queue *)tx_queue; > > > > if (txq->offloads =3D=3D 0 && > > > > #ifdef RTE_LIBRTE_SECURITY > > > > !(txq->using_ipsec) && > > > > #endif > > > > txq->tx_rs_thresh >=3D RTE_PMD_IXGBE_TX_MAX_BURST) { > > > > if (txq->tx_rs_thresh <=3D RTE_IXGBE_TX_MAX_FREE_BUF_SZ && > > > > <-------------= ------ Add the same check > > > > (rte_eal_process_type() !=3D RTE_PROC_PRIMARY || > > > > txq->sw_ring_v !=3D NULL)) { > > > > return ixgbe_tx_done_cleanup_vec(txq, free_cnt); > > > > > > Could you probably explain a bit more why it is needed? > > > > To align with the vector selection path: > > > > if (txq->tx_rs_thresh <=3D RTE_IXGBE_TX_MAX_FREE_BUF_SZ && > > (rte_eal_process_type() !=3D RTE_PROC_PRIMARY || > > ixgbe_txq_vec_setup(txq) =3D=3D 0)) >=20 >=20 > Ok, so to make sure that TX is running in vector mode? That's right, since no variable to save the vector mode selection, then the check condition should be the same. > If so, then doesn't txq->sw_ring_v !=3D NULL was intended to do so? > BTW, is it a valid check? Considering that sw_ring and sw_ring_v > is a union? Yes, sw_ring_v should always be !NULL ;-) >=20 > > > > > > > > > > > } else { > > > > return ixgbe_tx_done_cleanup_simple(txq, free_cnt); > > > > } > > > > > > > > > 2.17.1