Eric Dumazet <eric.dumazet@xxxxxxxxx> writes: > On Mon, 2013-07-29 at 10:55 +0100, Luis Henriques wrote: >> Eric Dumazet <eric.dumazet@xxxxxxxxx> writes: >> >> > On Sun, 2013-07-28 at 16:01 -0700, Eric Dumazet wrote: >> >> On Sun, 2013-07-28 at 21:22 +0100, Ben Hutchings wrote: >> >> >> >> > >> >> > Since we know lengths > 4K work, perhaps it would be worth testing with >> >> > the fragment cache size reduced to 16K? The driver would never >> >> > previously have used RX buffers crossing 16K boundaries, except if SLOB >> >> > was used (and that's an unlikely combination). >> >> >> >> Sure, please note the following maths : >> >> >> >> NET_SKB_PAD + 1536 + sizeof(struct skb_shared_info) = 1920 >> >> >> >> 16384/1920 = 8 >> >> >> >> 32768/1920 = 17 >> >> >> >> I don't think atl1c is used in any critical host (given it doesn't even >> >> provide RX checksums and GRO ...), so I will provide a patch doing mere >> >> page allocations. >> >> >> > >> > Oh well, look at code around line 2530 >> > >> > * The atl1c chip can DMA to 64-bit addresses, but it uses a single >> > * shared register for the high 32 bits, so only a single, aligned, >> > * 4 GB physical address range can be used at a time. >> > * >> > * Supporting 64-bit DMA on this hardware is more trouble than it's >> > * worth. It is far easier to limit to 32-bit DMA than update >> > * various kernel subsystems to support the mechanics required by a >> > * fixed-high-32-bit system. >> > */ >> > if ((pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) != 0) || >> > (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) != 0)) { >> > dev_err(&pdev->dev, "No usable DMA configuration,aborting\n"); >> > goto err_dma; >> > } >> > >> > It looks like we have a winner ! >> > >> > This $@!? really needs DMA32 allocations. >> > >> > Currently only tested on TX patch, it needs same care on RX >> > >> > diff --git a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c >> > index 786a874..e2ee962 100644 >> > --- a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c >> > +++ b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c >> > @@ -1660,7 +1660,8 @@ static int atl1c_alloc_rx_buffer(struct atl1c_adapter *adapter) >> > while (next_info->flags & ATL1C_BUFFER_FREE) { >> > rfd_desc = ATL1C_RFD_DESC(rfd_ring, rfd_next_to_use); >> > >> > - skb = netdev_alloc_skb(adapter->netdev, adapter->rx_buffer_len); >> > + skb = __netdev_alloc_skb(adapter->netdev, adapter->rx_buffer_len, >> > + GFP_ATOMIC | GFP_DMA32); >> > if (unlikely(!skb)) { >> > if (netif_msg_rx_err(adapter)) >> > dev_warn(&pdev->dev, "alloc rx buffer failed\n"); >> > >> > >> > -- >> > To unsubscribe from this list: send the line "unsubscribe netdev" in >> > the body of a message to majordomo@xxxxxxxxxxxxxxx >> > More majordomo info at http://vger.kernel.org/majordomo-info.html >> >> Using both patches from Eric (to the atl1c driver and to >> net/core/skbuff.c) , I got the following: >> >> [ 25.176311] ------------[ cut here ]------------ >> [ 25.179857] kernel BUG at mm/slub.c:1360! >> [ 25.183495] invalid opcode: 0000 [#1] SMP >> [ 25.186919] CPU: 3 PID: 1705 Comm: ip Not tainted 3.11.0-rc2+ #15 >> [ 25.190319] Hardware name: ASUSTeK COMPUTER INC. X101CH/X101CH, BIOS X101CH.1203 07/30/2012 >> [ 25.193828] task: f504f8c0 ti: f514e000 task.ti: f514e000 >> [ 25.197348] EIP: 0060:[<c1135e27>] EFLAGS: 00010002 CPU: 3 >> [ 25.200896] EIP is at new_slab+0x1c7/0x200 >> [ 25.204391] EAX: f6801a00 EBX: f6801a00 ECX: ffffffff EDX: 00010224 >> [ 25.207942] ESI: f6800ea0 EDI: f6801a00 EBP: f514f91c ESP: f514f904 >> [ 25.211541] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 >> [ 25.215113] CR0: 80050033 CR2: bff28afc CR3: 35fcd000 CR4: 000007f0 >> [ 25.218695] Stack: >> [ 25.222259] f514f954 c107acc7 00000003 00000000 f6800ea0 f6801a00 f514f984 c179d9e6 >> [ 25.226156] 80100010 00000000 00100010 c162fb40 00010224 f6800ea0 8015000b 00000000 >> [ 25.226168] 00000286 c162fb1c 00000024 f514f964 00000000 f5d963c0 00000296 f5d963c0 >> [ 25.226170] Call Trace: >> [ 25.226184] [<c107acc7>] ? enqueue_task_fair+0x5c7/0x7d0 >> [ 25.226197] [<c179d9e6>] __slab_alloc.constprop.71+0x248/0x409 >> [ 25.226205] [<c162fb40>] ? __alloc_skb+0x60/0x270 >> [ 25.226211] [<c162fb1c>] ? __alloc_skb+0x3c/0x270 >> [ 25.226218] [<c106f688>] ? ttwu_do_wakeup+0x18/0x100 >> [ 25.226226] [<c1139440>] __kmalloc_track_caller+0x100/0x150 >> [ 25.226232] [<c10718a9>] ? try_to_wake_up+0x149/0x230 >> [ 25.226238] [<c162fb40>] ? __alloc_skb+0x60/0x270 >> [ 25.226244] [<c162f482>] __kmalloc_reserve.isra.30+0x22/0x70 >> [ 25.226250] [<c162fb40>] __alloc_skb+0x60/0x270 >> [ 25.226257] [<c162ff71>] __netdev_alloc_skb+0x41/0xc0 >> [ 25.226265] [<c145cbe5>] atl1c_alloc_rx_buffer+0x125/0x290 >> [ 25.226272] [<c145ce79>] atl1c_configure+0x129/0x420 >> [ 25.226279] [<c164d48f>] ? linkwatch_fire_event+0x2f/0x90 >> [ 25.226286] [<c1006a10>] ? via_no_dac+0x40/0x40 >> [ 25.226292] [<c145dcb3>] atl1c_up+0x23/0x1e0 >> [ 25.226298] [<c1006a10>] ? via_no_dac+0x40/0x40 >> [ 25.226305] [<c145e3c9>] atl1c_open+0x269/0x310 >> [ 25.226311] [<c1006a10>] ? via_no_dac+0x40/0x40 >> [ 25.226317] [<c163dd43>] __dev_open+0x83/0xf0 >> [ 25.226325] [<c17a7224>] ? _raw_spin_unlock_bh+0x14/0x20 >> [ 25.226331] [<c163e021>] __dev_change_flags+0x81/0x160 >> [ 25.226337] [<c163e1a8>] dev_change_flags+0x18/0x50 >> [ 25.226343] [<c164b200>] do_setlink+0x2e0/0x810 >> [ 25.226350] [<c10fc110>] ? find_get_page+0x20/0xa0 >> [ 25.226357] [<c12ccff2>] ? nla_parse+0x22/0xa0 >> [ 25.226364] [<c116b413>] ? __find_get_block_slow+0xd3/0x180 >> [ 25.226370] [<c164bd92>] rtnl_newlink+0x282/0x510 >> [ 25.226378] [<c12735cc>] ? security_capable+0x1c/0x30 >> [ 25.226384] [<c1648c68>] rtnetlink_rcv_msg+0x88/0x1f0 >> [ 25.226391] [<c1139386>] ? __kmalloc_track_caller+0x46/0x150 >> [ 25.226397] [<c162fb40>] ? __alloc_skb+0x60/0x270 >> [ 25.226403] [<c1648be0>] ? rtnetlink_rcv+0x30/0x30 >> [ 25.226410] [<c165f016>] netlink_rcv_skb+0x86/0xa0 >> [ 25.226416] [<c1648bd1>] rtnetlink_rcv+0x21/0x30 >> [ 25.226422] [<c165db38>] netlink_unicast+0x118/0x1b0 >> [ 25.226428] [<c165e17f>] netlink_sendmsg+0x23f/0x3f0 >> [ 25.226435] [<c162926b>] sock_sendmsg+0x7b/0xb0 >> [ 25.226443] [<c1102dc9>] ? __alloc_pages_nodemask+0x119/0x7a0 >> [ 25.226450] [<c1629661>] ___sys_sendmsg+0x291/0x2a0 >> [ 25.226457] [<c10fbe56>] ? unlock_page+0x46/0x50 >> [ 25.226464] [<c111a348>] ? __do_fault+0x388/0x4a0 >> [ 25.226471] [<c1107196>] ? lru_cache_add+0x16/0x20 >> [ 25.226477] [<c1125174>] ? page_add_new_anon_rmap+0x74/0x100 >> [ 25.226483] [<c1631dd5>] ? skb_dequeue+0x45/0x60 >> [ 25.226491] [<c111da1a>] ? handle_mm_fault+0x1ca/0x2b0 >> [ 25.226497] [<c11545d1>] ? __d_free+0x31/0x50 >> [ 25.226504] [<c162a4e8>] __sys_sendmsg+0x38/0x70 >> [ 25.226510] [<c162a536>] SyS_sendmsg+0x16/0x20 >> [ 25.226517] [<c162ac1b>] SyS_socketcall+0x29b/0x2f0 >> [ 25.226524] [<c11440bd>] ? ____fput+0xd/0x10 >> [ 25.226531] [<c1035b80>] ? vmalloc_sync_all+0x10/0x10 >> [ 25.226537] [<c17a7fbb>] sysenter_do_call+0x12/0x22 >> [ 25.226600] Code: e9 4a ff ff ff 8b 7d f0 eb b5 31 c0 eb dc 89 f9 b8 00 10 00 >> 00 d3 e0 ba 5a 00 00 00 89 c1 8b 45 f0 e8 ae 42 18 00 e9 38 ff ff ff <0f> 0b >> 8b 7b 24 b9 00 0f af c1 8b 45 f0 c7 04 24 00 00 00 00 89 >> [ 25.226609] EIP: [<c1135e27>] new_slab+0x1c7/0x200 SS:ESP 0068:f514f904 >> [ 25.226614] ---[ end trace 6188393b9e234ab1 ]--- >> [ 26.757161] input: ACPI Virtual Keyboard Device as /devices/virtual/input/input13 >> >> Reverting the skbuff.c patch and using only the atl1c_main.c one, I >> see again the failures with the driver. >> >> So far the only options that seem to get the driver working for me are >> either Neil Horman's patch or reverting 69b08f6 ("net: use bigger >> pages in __netdev_alloc_frag"). >> >> Cheers > > Yes, forget about kmalloc() use GFP_DMA32, its not supported. > > Lets try following patch ? > > diff --git a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c > index 786a874..f32189b 100644 > --- a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c > +++ b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c > @@ -1639,6 +1639,28 @@ static inline void atl1c_rx_checksum(struct atl1c_adapter *adapter, > skb_checksum_none_assert(skb); > } > > + > +static struct sk_buff *atl1c_alloc_skb(unsigned int len) > +{ > + unsigned int head_size; > + void *data; > + > + head_size = SKB_DATA_ALIGN(len + NET_SKB_PAD) + > + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); > + > + if (head_size <= PAGE_SIZE) { > + struct page *page = alloc_page(GFP_ATOMIC); > + > + data = page ? page_address(page) : NULL; > + } else { > + data = kmalloc(head_size, GFP_ATOMIC); > + head_size = 0; > + } > + if (data) > + return build_skb(data, head_size); > + return NULL; > +} > + > static int atl1c_alloc_rx_buffer(struct atl1c_adapter *adapter) > { > struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring; > @@ -1660,7 +1682,7 @@ static int atl1c_alloc_rx_buffer(struct atl1c_adapter *adapter) > while (next_info->flags & ATL1C_BUFFER_FREE) { > rfd_desc = ATL1C_RFD_DESC(rfd_ring, rfd_next_to_use); > > - skb = netdev_alloc_skb(adapter->netdev, adapter->rx_buffer_len); > + skb = atl1c_alloc_skb(adapter->rx_buffer_len); > if (unlikely(!skb)) { > if (netif_msg_rx_err(adapter)) > dev_warn(&pdev->dev, "alloc rx buffer failed\n"); > I confirm that I can't reproduce the issue using this patch. Cheers, -- Luis -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html