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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR08MB3759 Original-Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=Gavin.Hu@arm.com; X-EOPAttributedMessage: 0 X-MS-Exchange-Transport-CrossTenantHeadersStripped: DB5EUR03FT061.eop-EUR03.prod.protection.outlook.com X-Forefront-Antispam-Report: CIP:63.35.35.123; IPV:CAL; SCL:-1; CTRY:IE; EFV:NLI; SFV:NSPM; SFS:(10009020)(4636009)(39860400002)(396003)(136003)(376002)(346002)(189003)(199004)(478600001)(33656002)(55016002)(86362001)(26826003)(2940100002)(70586007)(966005)(9686003)(53546011)(70206006)(26005)(336012)(4326008)(6506007)(186003)(5660300002)(110136005)(2906002)(54906003)(316002)(81156014)(81166006)(356004)(8676002)(7696005)(52536014)(8936002); DIR:OUT; SFP:1101; SCL:1; SRVR:DB6PR0802MB2325; H:64aa7808-outbound-1.mta.getcheckrecipient.com; FPR:; SPF:Pass; LANG:en; PTR:ec2-63-35-35-123.eu-west-1.compute.amazonaws.com; MX:1; A:1; X-MS-Office365-Filtering-Correlation-Id-Prvs: 54c06bb5-e1d6-4402-2d59-08d7b1249279 X-Forefront-PRVS: 03137AC81E X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Feb 2020 08:05:00.5404 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 71d46bd3-b25f-43de-9f02-08d7b12496f9 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d; Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB6PR0802MB2325 Subject: Re: [dpdk-dev] [PATCH v4] net/i40e: relaxed barrier in the tx fastpath 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" Hi Jerin, Could you help review this patch? We discussed a lot on this topic and I t= hink we agreed already to relax the barrier only on the fast path. Best Regards, Gavin > -----Original Message----- > From: Gavin Hu > Sent: Friday, February 14, 2020 3:58 PM > To: Gavin Hu > Subject: Re: [dpdk-dev] [PATCH v4] net/i40e: relaxed barrier in the tx > fastpath >=20 > To keep ordering of mixed accesses, rte_cio is sufficient. > The rte_io barrier inside the I40E_PCI_REG_WRITE is overkill.[1] >=20 > [1] http://inbox.dpdk.org/dev/CALBAE1M-ezVWCjqCZDBw+MMDEC4O9 > qf0Kpn89EMdGDajepKoZQ@mail.gmail.com >=20 > Fixes: 4861cde46116 ("i40e: new poll mode driver") > Cc: stable@dpdk.org >=20 > Signed-off-by: Gavin Hu > --- > V4: > - add the Fixes tag and CC stable > V3: > - optimize the barriers in the fast path only, leave as it is for the > barriers in the slow path and control path > - drop the virtio patches from the list as they are in the control path > - it makes more sense to relax the barrier in the fast path, at the PMD l= evel. > relaxing the fundamental rte_io_x barriers APIs requires scrutinization= s for > each PMDs which use the barriers directly or indirectly. > V2: > - remove virtio_pci_read/write64 APIs definitions, they are not needed an= d > generate compiling errors like " error: unused function 'virtio_pci_write= 64' [- > Werror,-Wunused-function]" > - update the reference link to kernel source code > --- > drivers/net/i40e/i40e_rxtx.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) >=20 > diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c > index fd1ae80da..8c0f7cc67 100644 > --- a/drivers/net/i40e/i40e_rxtx.c > +++ b/drivers/net/i40e/i40e_rxtx.c > @@ -1248,7 +1248,8 @@ i40e_xmit_pkts(void *tx_queue, struct rte_mbuf > **tx_pkts, uint16_t nb_pkts) > (unsigned) txq->port_id, (unsigned) txq->queue_id, > (unsigned) tx_id, (unsigned) nb_tx); >=20 > -I40E_PCI_REG_WRITE(txq->qtx_tail, tx_id); > +rte_cio_wmb(); > +I40E_PCI_REG_WRITE_RELAXED(txq->qtx_tail, tx_id); > txq->tx_tail =3D tx_id; >=20 > return nb_tx; > -- > 2.17.1 >=20