From 6d0f60b0f8588fd4380ea5df9601e12fddd55ce2 Mon Sep 17 00:00:00 2001 From: Lorenzo Bianconi Date: Wed, 21 Nov 2018 16:32:10 +0100 Subject: net: thunderx: set xdp_prog to NULL if bpf_prog_add fails Set xdp_prog pointer to NULL if bpf_prog_add fails since that routine reports the error code instead of NULL in case of failure and xdp_prog pointer value is used in the driver to verify if XDP is currently enabled. Moreover report the error code to userspace if nicvf_xdp_setup fails Fixes: 05c773f52b96 ("net: thunderx: Add basic XDP support") Signed-off-by: Lorenzo Bianconi Signed-off-by: David S. Miller --- drivers/net/ethernet/cavium/thunder/nicvf_main.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'drivers/net/ethernet/cavium') diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_main.c b/drivers/net/ethernet/cavium/thunder/nicvf_main.c index 768f584f8392..88f8a8fa93cd 100644 --- a/drivers/net/ethernet/cavium/thunder/nicvf_main.c +++ b/drivers/net/ethernet/cavium/thunder/nicvf_main.c @@ -1784,6 +1784,7 @@ static int nicvf_xdp_setup(struct nicvf *nic, struct bpf_prog *prog) bool if_up = netif_running(nic->netdev); struct bpf_prog *old_prog; bool bpf_attached = false; + int ret = 0; /* For now just support only the usual MTU sized frames */ if (prog && (dev->mtu > 1500)) { @@ -1817,8 +1818,12 @@ static int nicvf_xdp_setup(struct nicvf *nic, struct bpf_prog *prog) if (nic->xdp_prog) { /* Attach BPF program */ nic->xdp_prog = bpf_prog_add(nic->xdp_prog, nic->rx_queues - 1); - if (!IS_ERR(nic->xdp_prog)) + if (!IS_ERR(nic->xdp_prog)) { bpf_attached = true; + } else { + ret = PTR_ERR(nic->xdp_prog); + nic->xdp_prog = NULL; + } } /* Calculate Tx queues needed for XDP and network stack */ @@ -1830,7 +1835,7 @@ static int nicvf_xdp_setup(struct nicvf *nic, struct bpf_prog *prog) netif_trans_update(nic->netdev); } - return 0; + return ret; } static int nicvf_xdp(struct net_device *netdev, struct netdev_bpf *xdp) -- cgit v1.2.3-59-g8ed1b From ef2a7cf1d8831535b8991459567b385661eb4a36 Mon Sep 17 00:00:00 2001 From: Lorenzo Bianconi Date: Fri, 23 Nov 2018 18:28:01 +0100 Subject: net: thunderx: set tso_hdrs pointer to NULL in nicvf_free_snd_queue Reset snd_queue tso_hdrs pointer to NULL in nicvf_free_snd_queue routine since it is used to check if tso dma descriptor queue has been previously allocated. The issue can be triggered with the following reproducer: $ip link set dev enP2p1s0v0 xdpdrv obj xdp_dummy.o $ip link set dev enP2p1s0v0 xdpdrv off [ 341.467649] WARNING: CPU: 74 PID: 2158 at mm/vmalloc.c:1511 __vunmap+0x98/0xe0 [ 341.515010] Hardware name: GIGABYTE H270-T70/MT70-HD0, BIOS T49 02/02/2018 [ 341.521874] pstate: 60400005 (nZCv daif +PAN -UAO) [ 341.526654] pc : __vunmap+0x98/0xe0 [ 341.530132] lr : __vunmap+0x98/0xe0 [ 341.533609] sp : ffff00001c5db860 [ 341.536913] x29: ffff00001c5db860 x28: 0000000000020000 [ 341.542214] x27: ffff810feb5090b0 x26: ffff000017e57000 [ 341.547515] x25: 0000000000000000 x24: 00000000fbd00000 [ 341.552816] x23: 0000000000000000 x22: ffff810feb5090b0 [ 341.558117] x21: 0000000000000000 x20: 0000000000000000 [ 341.563418] x19: ffff000017e57000 x18: 0000000000000000 [ 341.568719] x17: 0000000000000000 x16: 0000000000000000 [ 341.574020] x15: 0000000000000010 x14: ffffffffffffffff [ 341.579321] x13: ffff00008985eb27 x12: ffff00000985eb2f [ 341.584622] x11: ffff0000096b3000 x10: ffff00001c5db510 [ 341.589923] x9 : 00000000ffffffd0 x8 : ffff0000086868e8 [ 341.595224] x7 : 3430303030303030 x6 : 00000000000006ef [ 341.600525] x5 : 00000000003fffff x4 : 0000000000000000 [ 341.605825] x3 : 0000000000000000 x2 : ffffffffffffffff [ 341.611126] x1 : ffff0000096b3728 x0 : 0000000000000038 [ 341.616428] Call trace: [ 341.618866] __vunmap+0x98/0xe0 [ 341.621997] vunmap+0x3c/0x50 [ 341.624961] arch_dma_free+0x68/0xa0 [ 341.628534] dma_direct_free+0x50/0x80 [ 341.632285] nicvf_free_resources+0x160/0x2d8 [nicvf] [ 341.637327] nicvf_config_data_transfer+0x174/0x5e8 [nicvf] [ 341.642890] nicvf_stop+0x298/0x340 [nicvf] [ 341.647066] __dev_close_many+0x9c/0x108 [ 341.650977] dev_close_many+0xa4/0x158 [ 341.654720] rollback_registered_many+0x140/0x530 [ 341.659414] rollback_registered+0x54/0x80 [ 341.663499] unregister_netdevice_queue+0x9c/0xe8 [ 341.668192] unregister_netdev+0x28/0x38 [ 341.672106] nicvf_remove+0xa4/0xa8 [nicvf] [ 341.676280] nicvf_shutdown+0x20/0x30 [nicvf] [ 341.680630] pci_device_shutdown+0x44/0x88 [ 341.684720] device_shutdown+0x144/0x250 [ 341.688640] kernel_restart_prepare+0x44/0x50 [ 341.692986] kernel_restart+0x20/0x68 [ 341.696638] __se_sys_reboot+0x210/0x238 [ 341.700550] __arm64_sys_reboot+0x24/0x30 [ 341.704555] el0_svc_handler+0x94/0x110 [ 341.708382] el0_svc+0x8/0xc [ 341.711252] ---[ end trace 3f4019c8439959c9 ]--- [ 341.715874] page:ffff7e0003ef4000 count:0 mapcount:0 mapping:0000000000000000 index:0x4 [ 341.723872] flags: 0x1fffe000000000() [ 341.727527] raw: 001fffe000000000 ffff7e0003f1a008 ffff7e0003ef4048 0000000000000000 [ 341.735263] raw: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000 [ 341.742994] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) where xdp_dummy.c is a simple bpf program that forwards the incoming frames to the network stack (available here: https://github.com/altoor/xdp_walkthrough_examples/blob/master/sample_1/xdp_dummy.c) Fixes: 05c773f52b96 ("net: thunderx: Add basic XDP support") Fixes: 4863dea3fab0 ("net: Adding support for Cavium ThunderX network controller") Signed-off-by: Lorenzo Bianconi Signed-off-by: David S. Miller --- drivers/net/ethernet/cavium/thunder/nicvf_queues.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'drivers/net/ethernet/cavium') diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c index 187a249ff2d1..fcaf18fa3904 100644 --- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c +++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c @@ -585,10 +585,12 @@ static void nicvf_free_snd_queue(struct nicvf *nic, struct snd_queue *sq) if (!sq->dmem.base) return; - if (sq->tso_hdrs) + if (sq->tso_hdrs) { dma_free_coherent(&nic->pdev->dev, sq->dmem.q_len * TSO_HEADER_SIZE, sq->tso_hdrs, sq->tso_hdrs_phys); + sq->tso_hdrs = NULL; + } /* Free pending skbs in the queue */ smp_rmb(); -- cgit v1.2.3-59-g8ed1b