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Message-ID: <CAOD=uF7=28Bx4eSpGfP-uTND42k1xKE3tvQ6+exSJha9Yjf-_w@mail.gmail.com>
Date: Sat, 10 Mar 2012 00:20:12 +0530
From: santosh prasad nayak <santoshprasadnayak@...il.com>
To: Rajesh Borundia <rajesh.borundia@...gic.com>
Cc: Sony Chacko <sony.chacko@...gic.com>,
netdev <netdev@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH 3/3] netxen: qlogic ethernet : Fix Endian Bug.
On Fri, Mar 9, 2012 at 10:04 PM, Rajesh Borundia
<rajesh.borundia@...gic.com> wrote:
>
>> -----Original Message-----
>> From: santosh nayak [mailto:santoshprasadnayak@...il.com]
>> Sent: Saturday, March 03, 2012 9:18 PM
>> To: Sony Chacko
>> Cc: Rajesh Borundia; netdev; linux-kernel; kernel-
>> janitors@...r.kernel.org; Santosh Nayak
>> Subject: [PATCH 3/3] netxen: qlogic ethernet : Fix Endian Bug.
>>
>> From: Santosh Nayak <santoshprasadnayak@...il.com>
>>
>> Fix endian bug.
>>
>> Signed-off-by: Santosh Nayak <santoshprasadnayak@...il.com>
>> ---
>> drivers/net/ethernet/qlogic/netxen/netxen_nic.h | 4 ++--
>> drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c | 12 +++++++-----
>> .../net/ethernet/qlogic/netxen/netxen_nic_main.c | 2 +-
>> 3 files changed, 10 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic.h
>> b/drivers/net/ethernet/qlogic/netxen/netxen_nic.h
>> index 2eeac32..b5de8a7 100644
>> --- a/drivers/net/ethernet/qlogic/netxen/netxen_nic.h
>> +++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic.h
>> @@ -954,7 +954,7 @@ typedef struct nx_mac_list_s {
>>
>> struct nx_vlan_ip_list {
>> struct list_head list;
>> - u32 ip_addr;
>> + __be32 ip_addr;
>> };
>>
>> /*
>> @@ -1780,7 +1780,7 @@ int netxen_process_rcv_ring(struct
>> nx_host_sds_ring *sds_ring, int max);
>> void netxen_p3_free_mac_list(struct netxen_adapter *adapter);
>> int netxen_config_intr_coalesce(struct netxen_adapter *adapter);
>> int netxen_config_rss(struct netxen_adapter *adapter, int enable);
>> -int netxen_config_ipaddr(struct netxen_adapter *adapter, u32 ip, int
>> cmd);
>> +int netxen_config_ipaddr(struct netxen_adapter *adapter, __be32 ip,
>> int cmd);
>> int netxen_linkevent_request(struct netxen_adapter *adapter, int
>> enable);
>> void netxen_advert_link_change(struct netxen_adapter *adapter, int
>> linkup);
>> void netxen_pci_camqm_read_2M(struct netxen_adapter *, u64, u64 *);
>> diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c
>> b/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c
>> index 6f37470..0f81287 100644
>> --- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c
>> +++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c
>> @@ -909,10 +909,11 @@ int netxen_config_rss(struct netxen_adapter
>> *adapter, int enable)
>> return rv;
>> }
>>
>> -int netxen_config_ipaddr(struct netxen_adapter *adapter, u32 ip, int
>> cmd)
>> +int netxen_config_ipaddr(struct netxen_adapter *adapter, __be32 ip,
>> int cmd)
>> {
>> nx_nic_req_t req;
>> u64 word;
>> + u64 ip_addr;
>> int rv;
>>
>> memset(&req, 0, sizeof(nx_nic_req_t));
>> @@ -922,7 +923,8 @@ int netxen_config_ipaddr(struct netxen_adapter
>> *adapter, u32 ip, int cmd)
>> req.req_hdr = cpu_to_le64(word);
>>
>> req.words[0] = cpu_to_le64(cmd);
>> - req.words[1] = cpu_to_le64(ip);
>> + ip_addr = be32_to_cpu(ip);
>> + *(__be64 *)&req.words[1] = cpu_to_be64(ip_addr);
>
> Adapter requires ip value in big endian stored at lower 32 bit address.
> The cpu_to_be64 will swap the lower 32 bit with higher 32 bit and adapter
> Will get incorrect ip addr. Instead u can do.
>
> U32 *ip_addr;
> ip_addr = (u32 *)&req.words[1];
> *ip_addr = ip;
1. It looks incomplete.
In the function call "netxen_send_cmd_descs" we have to pass "&req" as
2nd argument not "ipaddr".
2. Your above suggestion is with assumption that the data type of 2nd
argument "ip"
in "netxen_config_ipaddr()" is still "u32". This is not true.
Some days back you suggested to change the data type to "__be32".
In the present patch
the "ip" is in "__be32" format i.e already in Big endian format
as per requirement.
We need to only convert this 32 bit to 64 bit. There are two ways:
a. *(__be64 *)&req.words[1] = ip; // auto conversion
b. *(__be64 *)&req.words[1] = cpu_to_be64(be32_to_cpu(ip));
// explicit conversion.
Please correct me if I am wrong.
regards
Santosh
>
>
>>
>> rv = netxen_send_cmd_descs(adapter, (struct cmd_desc_type0
>> *)&req, 1);
>> if (rv != 0) {
>> @@ -1050,7 +1052,7 @@ int netxen_get_flash_mac_addr(struct
>> netxen_adapter *adapter, u64 *mac)
>> if (netxen_get_flash_block(adapter, offset, sizeof(u64), pmac) ==
>> -1)
>> return -1;
>>
>> - if (*mac == cpu_to_le64(~0ULL)) {
>> + if (*mac == ~0ULL) {
>
> *mac is in little endian format so compare it with cpu_to_le64.
>
>>
>> offset = NX_OLD_MAC_ADDR_OFFSET +
>> (adapter->portnum * sizeof(u64));
>> @@ -1059,7 +1061,7 @@ int netxen_get_flash_mac_addr(struct
>> netxen_adapter *adapter, u64 *mac)
>> offset, sizeof(u64), pmac) == -1)
>> return -1;
>>
>> - if (*mac == cpu_to_le64(~0ULL))
>> + if (*mac == ~0ULL)
>
> *mac here is in little endian format so compare it with cpu_to_le64.
>
>> return -1;
>> }
>> return 0;
>> @@ -2178,7 +2180,7 @@ lock_try:
>> NX_WR_DUMP_REG(FLASH_ROM_WINDOW, adapter->ahw.pci_base0,
>> waddr);
>> raddr = FLASH_ROM_DATA + (fl_addr & 0x0000FFFF);
>> NX_RD_DUMP_REG(raddr, adapter->ahw.pci_base0, &val);
>> - *data_buff++ = cpu_to_le32(val);
>> + *data_buff++ = val;
>
> It should be cpu_to_le32 as it is returned to tool which requires
> output in little endian.
>
>> fl_addr += sizeof(val);
>> }
>> readl((void __iomem *)(adapter->ahw.pci_base0 +
>> NX_FLASH_SEM2_ULK));
>> diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
>> b/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
>> index 8dc4a134..70783b4 100644
>> --- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
>> +++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
>> @@ -818,7 +818,7 @@ netxen_check_options(struct netxen_adapter
>> *adapter)
>> adapter->driver_mismatch = 1;
>> return;
>> }
>> - ptr32[i] = cpu_to_le32(val);
>> + ptr32[i] = val;
>
> Here val should be in little endian (cpu_to_le32) as it will be referenced by byte array to print serial number.
>
>> offset += sizeof(u32);
>> }
>>
>> --
>> 1.7.4.4
>>
>
>
> Sorry for Late reply.
>
> Rajesh
>
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