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Miller" , Sasha Levin Subject: [PATCH AUTOSEL for 4.4 065/101] bnx2x: Align RX buffers Thread-Topic: [PATCH AUTOSEL for 4.4 065/101] bnx2x: Align RX buffers Thread-Index: AQHTtpqWJikHHlhvikCvOc9Ihw/Pvw== Date: Thu, 8 Mar 2018 05:01:58 +0000 Message-ID: <20180308050023.8548-65-alexander.levin@microsoft.com> References: <20180308050023.8548-1-alexander.levin@microsoft.com> In-Reply-To: <20180308050023.8548-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB1016;7:baKgjc/5qIsWUH0CnpuUSG1e4P75nVb2ArLAA8kgI5s30/cYGv2HLJFVrpRGHxyxNDDFL9Pgk9U3YPCTAzlsUP8OSsV+vkGX8ckpOGGjkveI9tfW46WVUbwp0eASrMic69Fa2RfBRxTuS8ZWfuYs666z4bwwInLdDQ84aPnvGRmQv15FLKP++61dCn8JWsjKGvUUBJT9fhiY4P1dVAVZXmlevX7zEFmCMg5k+nDX2e0fIjnS9t5b36l7Q1vzkQi3;20:zf/oMvdy/1pFnh1ec9xPXU6AvaGHvShybQuo/Cyo0nUuuPSVOfQKcwBlqvXhziyilN5QovuVMgoZsvDXuuvHWikT3Y2haUTC1fYaYUP/2A/ltQUY7Egg413LRgoE5CdzReVcOjLDgS3oN4pE6qsc8jY0wtvlUiZjHQls9SiWwoM= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: b63aecc0-0b0b-4c40-4779-08d584b2685c x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB1016; x-ms-traffictypediagnostic: DM5PR2101MB1016: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(89211679590171); x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(8211001083)(61425038)(6040501)(2401047)(5005006)(8121501046)(3002001)(10201501046)(3231220)(944501244)(52105095)(93006095)(93001095)(6055026)(61426038)(61427038)(6041288)(20161123558120)(20161123560045)(20161123564045)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123562045)(6072148)(201708071742011);SRVR:DM5PR2101MB1016;BCL:0;PCL:0;RULEID:;SRVR:DM5PR2101MB1016; x-forefront-prvs: 060503E79B x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(396003)(366004)(39380400002)(39860400002)(346002)(376002)(199004)(189003)(3660700001)(10290500003)(14454004)(25786009)(478600001)(53936002)(5660300001)(6436002)(6486002)(68736007)(110136005)(54906003)(316002)(6512007)(105586002)(22452003)(3280700002)(2900100001)(3846002)(6116002)(72206003)(4326008)(2906002)(59450400001)(6506007)(102836004)(86612001)(1076002)(36756003)(76176011)(26005)(186003)(107886003)(2950100002)(7736002)(97736004)(8676002)(99286004)(5250100002)(8936002)(81166006)(81156014)(86362001)(305945005)(2501003)(575784001)(66066001)(106356001)(10090500001)(22906009)(217873001);DIR:OUT;SFP:1102;SCL:1;SRVR:DM5PR2101MB1016;H:DM5PR2101MB1032.namprd21.prod.outlook.com;FPR:;SPF:None;PTR:InfoNoRecords;A:1;MX:1;LANG:en; x-microsoft-antispam-message-info: Ody8wDlvQ8pCHpuz9Ktpl+jezSEq8k0lwr2Ms5eNdQ+Y0vyDSpI6bE2zpeFBBAYYWutztnZM2DLGe5qUDEGZLvMT/vvrjeoc/OEaqYURgEHqon6s55mSWE7sRpR7az/Xuf2KvzZh83AtzmnKagkRaTT9PxdsqmBCfNkszCihhx4HKfVEP16syp08Otcb0vZY3v0c+5zuodC/qZwMOSv3M+kytDK/2PolbOCcvDA2UKvGyWbiRev1QM6CGRhGapZFbQLZFFP4xdJiE5hWNABOcq1LRANIvPp8ph8JZ+zgBYTqlmyiK2caZPVW6RGofOEsVgWmDRwzWDowd1ELMvJbNw== spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: b63aecc0-0b0b-4c40-4779-08d584b2685c X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Mar 2018 05:01:58.9705 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB1016 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Scott Wood [ Upstream commit 9b70de6d0266888b3743f03802502e43131043c8 ] The bnx2x driver is not providing proper alignment on the receive buffers i= t passes to build_skb(), causing skb_shared_info to be misaligned. skb_shared_info contains an atomic, and while PPC normally supports unaligned accesses, it does not support unaligned atomics. Aligning the size of rx buffers will ensure that page_frag_alloc() returns aligned addresses. This can be reproduced on PPC by setting the network MTU to 1450 (or other non-multiple-of-4) and then generating sufficient inbound network traffic (one or two large "wget"s usually does it), producing the following oops: Unable to handle kernel paging request for unaligned access at address 0xc0= 0000ffc43af656 Faulting instruction address: 0xc00000000080ef8c Oops: Kernel access of bad area, sig: 7 [#1] SMP NR_CPUS=3D2048 NUMA PowerNV Modules linked in: vmx_crypto powernv_rng rng_core powernv_op_panel leds_po= wernv led_class nfsd ip_tables x_tables autofs4 xfs lpfc bnx2x mdio libcrc3= 2c crc_t10dif crct10dif_generic crct10dif_common CPU: 104 PID: 0 Comm: swapper/104 Not tainted 4.11.0-rc8-00088-g4c761da #2 task: c00000ffd4892400 task.stack: c00000ffd4920000 NIP: c00000000080ef8c LR: c00000000080eee8 CTR: c0000000001f8320 REGS: c00000ffffc33710 TRAP: 0600 Not tainted (4.11.0-rc8-00088-g4c761da= ) MSR: 9000000000009033 CR: 24082042 XER: 00000000 CFAR: c00000000080eea0 DAR: c00000ffc43af656 DSISR: 00000000 SOFTE: 1 GPR00: c000000000907f64 c00000ffffc33990 c000000000dd3b00 c00000ffcaf22100 GPR04: c00000ffcaf22e00 0000000000000000 0000000000000000 0000000000000000 GPR08: 0000000000b80008 c00000ffc43af636 c00000ffc43af656 0000000000000000 GPR12: c0000000001f6f00 c00000000fe1a000 000000000000049f 000000000000c51f GPR16: 00000000ffffef33 0000000000000000 0000000000008a43 0000000000000001 GPR20: c00000ffc58a90c0 0000000000000000 000000000000dd86 0000000000000000 GPR24: c000007fd0ed10c0 00000000ffffffff 0000000000000158 000000000000014a GPR28: c00000ffc43af010 c00000ffc9144000 c00000ffcaf22e00 c00000ffcaf22100 NIP [c00000000080ef8c] __skb_clone+0xdc/0x140 LR [c00000000080eee8] __skb_clone+0x38/0x140 Call Trace: [c00000ffffc33990] [c00000000080fb74] skb_clone+0x74/0x110 (unreliable) [c00000ffffc339c0] [c000000000907f64] packet_rcv+0x144/0x510 [c00000ffffc33a40] [c000000000827b64] __netif_receive_skb_core+0x5b4/0xd80 [c00000ffffc33b00] [c00000000082b2bc] netif_receive_skb_internal+0x2c/0xc0 [c00000ffffc33b40] [c00000000082c49c] napi_gro_receive+0x11c/0x260 [c00000ffffc33b80] [d000000066483d68] bnx2x_poll+0xcf8/0x17b0 [bnx2x] [c00000ffffc33d00] [c00000000082babc] net_rx_action+0x31c/0x480 [c00000ffffc33e10] [c0000000000d5a44] __do_softirq+0x164/0x3d0 [c00000ffffc33f00] [c0000000000d60a8] irq_exit+0x108/0x120 [c00000ffffc33f20] [c000000000015b98] __do_irq+0x98/0x200 [c00000ffffc33f90] [c000000000027f14] call_do_irq+0x14/0x24 [c00000ffd4923a90] [c000000000015d94] do_IRQ+0x94/0x110 [c00000ffd4923ae0] [c000000000008d90] hardware_interrupt_common+0x150/0x160 Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/= ethernet/broadcom/bnx2x/bnx2x_cmn.c index e5911ccb2148..889462170b7c 100644 --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c @@ -2044,6 +2044,7 @@ static void bnx2x_set_rx_buf_size(struct bnx2x *bp) ETH_OVREHEAD + mtu + BNX2X_FW_RX_ALIGN_END; + fp->rx_buf_size =3D SKB_DATA_ALIGN(fp->rx_buf_size); /* Note : rx_buf_size doesn't take into account NET_SKB_PAD */ if (fp->rx_buf_size + NET_SKB_PAD <=3D PAGE_SIZE) fp->rx_frag_size =3D fp->rx_buf_size + NET_SKB_PAD; --=20 2.14.1