| Message ID | 1723237284-7262-1-git-send-email-haiyangz@microsoft.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | [net] net: mana: Fix RX buf alloc_size alignment and atomic op panic | expand |
> Subject: [PATCH net] net: mana: Fix RX buf alloc_size alignment and atomic op > panic > > The MANA driver's RX buffer alloc_size is passed into napi_build_skb() to create > SKB. skb_shinfo(skb) is located at the end of skb, and its alignment is affected by > the alloc_size passed into napi_build_skb(). The size needs to be aligned properly > for better performance and atomic operations. > Otherwise, on ARM64 CPU, for certain MTU settings like 4000, atomic operations > may panic on the skb_shinfo(skb)->dataref due to alignment fault. > > To fix this bug, add proper alignment to the alloc_size calculation. > > Sample panic info: > [ 253.298819] Unable to handle kernel paging request at virtual address > ffff000129ba5cce [ 253.300900] Mem abort info: > [ 253.301760] ESR = 0x0000000096000021 > [ 253.302825] EC = 0x25: DABT (current EL), IL = 32 bits > [ 253.304268] SET = 0, FnV = 0 > [ 253.305172] EA = 0, S1PTW = 0 > [ 253.306103] FSC = 0x21: alignment fault > Call trace: > __skb_clone+0xfc/0x198 > skb_clone+0x78/0xe0 > raw6_local_deliver+0xfc/0x228 > ip6_protocol_deliver_rcu+0x80/0x500 > ip6_input_finish+0x48/0x80 > ip6_input+0x48/0xc0 > ip6_sublist_rcv_finish+0x50/0x78 > ip6_sublist_rcv+0x1cc/0x2b8 > ipv6_list_rcv+0x100/0x150 > __netif_receive_skb_list_core+0x180/0x220 > netif_receive_skb_list_internal+0x198/0x2a8 > __napi_poll+0x138/0x250 > net_rx_action+0x148/0x330 > handle_softirqs+0x12c/0x3a0 > > Cc: stable@vger.kernel.org > Fixes: 80f6215b450e ("net: mana: Add support for jumbo frame") > Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Reviewed-by: Long Li <longli@microsoft.com> > --- > drivers/net/ethernet/microsoft/mana/mana_en.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c > b/drivers/net/ethernet/microsoft/mana/mana_en.c > index d2f07e179e86..ae717d06e66f 100644 > --- a/drivers/net/ethernet/microsoft/mana/mana_en.c > +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c > @@ -599,7 +599,11 @@ static void mana_get_rxbuf_cfg(int mtu, u32 *datasize, > u32 *alloc_size, > else > *headroom = XDP_PACKET_HEADROOM; > > - *alloc_size = mtu + MANA_RXBUF_PAD + *headroom; > + *alloc_size = SKB_DATA_ALIGN(mtu + MANA_RXBUF_PAD + *headroom); > + > + /* Using page pool in this case, so alloc_size is PAGE_SIZE */ > + if (*alloc_size < PAGE_SIZE) > + *alloc_size = PAGE_SIZE; > > *datasize = mtu + ETH_HLEN; > } > -- > 2.34.1
Hello: This patch was applied to netdev/net.git (main) by David S. Miller <davem@davemloft.net>: On Fri, 9 Aug 2024 14:01:24 -0700 you wrote: > The MANA driver's RX buffer alloc_size is passed into napi_build_skb() to > create SKB. skb_shinfo(skb) is located at the end of skb, and its alignment > is affected by the alloc_size passed into napi_build_skb(). The size needs > to be aligned properly for better performance and atomic operations. > Otherwise, on ARM64 CPU, for certain MTU settings like 4000, atomic > operations may panic on the skb_shinfo(skb)->dataref due to alignment fault. > > [...] Here is the summary with links: - [net] net: mana: Fix RX buf alloc_size alignment and atomic op panic https://git.kernel.org/netdev/net/c/32316f676b4e You are awesome, thank you!
diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c index d2f07e179e86..ae717d06e66f 100644 --- a/drivers/net/ethernet/microsoft/mana/mana_en.c +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c @@ -599,7 +599,11 @@ static void mana_get_rxbuf_cfg(int mtu, u32 *datasize, u32 *alloc_size, else *headroom = XDP_PACKET_HEADROOM; - *alloc_size = mtu + MANA_RXBUF_PAD + *headroom; + *alloc_size = SKB_DATA_ALIGN(mtu + MANA_RXBUF_PAD + *headroom); + + /* Using page pool in this case, so alloc_size is PAGE_SIZE */ + if (*alloc_size < PAGE_SIZE) + *alloc_size = PAGE_SIZE; *datasize = mtu + ETH_HLEN; }
The MANA driver's RX buffer alloc_size is passed into napi_build_skb() to create SKB. skb_shinfo(skb) is located at the end of skb, and its alignment is affected by the alloc_size passed into napi_build_skb(). The size needs to be aligned properly for better performance and atomic operations. Otherwise, on ARM64 CPU, for certain MTU settings like 4000, atomic operations may panic on the skb_shinfo(skb)->dataref due to alignment fault. To fix this bug, add proper alignment to the alloc_size calculation. Sample panic info: [ 253.298819] Unable to handle kernel paging request at virtual address ffff000129ba5cce [ 253.300900] Mem abort info: [ 253.301760] ESR = 0x0000000096000021 [ 253.302825] EC = 0x25: DABT (current EL), IL = 32 bits [ 253.304268] SET = 0, FnV = 0 [ 253.305172] EA = 0, S1PTW = 0 [ 253.306103] FSC = 0x21: alignment fault Call trace: __skb_clone+0xfc/0x198 skb_clone+0x78/0xe0 raw6_local_deliver+0xfc/0x228 ip6_protocol_deliver_rcu+0x80/0x500 ip6_input_finish+0x48/0x80 ip6_input+0x48/0xc0 ip6_sublist_rcv_finish+0x50/0x78 ip6_sublist_rcv+0x1cc/0x2b8 ipv6_list_rcv+0x100/0x150 __netif_receive_skb_list_core+0x180/0x220 netif_receive_skb_list_internal+0x198/0x2a8 __napi_poll+0x138/0x250 net_rx_action+0x148/0x330 handle_softirqs+0x12c/0x3a0 Cc: stable@vger.kernel.org Fixes: 80f6215b450e ("net: mana: Add support for jumbo frame") Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> --- drivers/net/ethernet/microsoft/mana/mana_en.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)