[PATCH] [net-next,v3] ibmvnic: Feature implementation of Vital Product Data (VPD) for the ibmvnic driver
Nathan Fontenot
nfont at linux.vnet.ibm.com
Sat Nov 11 01:54:06 AEDT 2017
On 11/10/2017 08:41 AM, Desnes Augusto Nunes do Rosário wrote:
>
>
> On 11/09/2017 06:31 PM, Nathan Fontenot wrote:
>> On 11/09/2017 01:00 PM, Desnes Augusto Nunes do Rosario wrote:
>>> This patch implements and enables VDP support for the ibmvnic driver.
>>> Moreover, it includes the implementation of suitable structs, signal
>>> transmission/handling and functions which allows the retrival of firmware
>>> information from the ibmvnic card through the ethtool command.
>>>
>>> Signed-off-by: Desnes A. Nunes do Rosario <desnesn at linux.vnet.ibm.com>
>>> Signed-off-by: Thomas Falcon <tlfalcon at linux.vnet.ibm.com>
>>> ---
>>> drivers/net/ethernet/ibm/ibmvnic.c | 149 ++++++++++++++++++++++++++++++++++++-
>>> drivers/net/ethernet/ibm/ibmvnic.h | 27 ++++++-
>>> 2 files changed, 173 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
>>> index d0cff28..693b502 100644
>>> --- a/drivers/net/ethernet/ibm/ibmvnic.c
>>> +++ b/drivers/net/ethernet/ibm/ibmvnic.c
>>> @@ -573,6 +573,15 @@ static int reset_tx_pools(struct ibmvnic_adapter *adapter)
>>> return 0;
>>> }
>>>
>>> +static void release_vpd_data(struct ibmvnic_adapter *adapter)
>>> +{
>>> + if (!adapter->vpd)
>>> + return;
>>> +
>>> + kfree(adapter->vpd->buff);
>>> + kfree(adapter->vpd);
>>> +}
>>> +
>>> static void release_tx_pools(struct ibmvnic_adapter *adapter)
>>> {
>>> struct ibmvnic_tx_pool *tx_pool;
>>> @@ -753,6 +762,8 @@ static void release_resources(struct ibmvnic_adapter *adapter)
>>> {
>>> int i;
>>>
>>> + release_vpd_data(adapter);
>>> +
>>> release_tx_pools(adapter);
>>> release_rx_pools(adapter);
>>>
>>> @@ -833,6 +844,53 @@ static int set_real_num_queues(struct net_device *netdev)
>>> return rc;
>>> }
>>>
>>> +static int ibmvnic_get_vpd(struct ibmvnic_adapter *adapter)
>>> +{
>>> + struct device *dev = &adapter->vdev->dev;
>>> + union ibmvnic_crq crq;
>>> + dma_addr_t dma_addr;
>>> + int len;
>>> +
>>> + if (adapter->vpd->buff)
>>> + len = adapter->vpd->len;
>>> +
>>> + reinit_completion(&adapter->fw_done);
>>> + crq.get_vpd_size.first = IBMVNIC_CRQ_CMD;
>>> + crq.get_vpd_size.cmd = GET_VPD_SIZE;
>>> + ibmvnic_send_crq(adapter, &crq);
>>> + wait_for_completion(&adapter->fw_done);
>>> +
>>
>> Shouldn't there be a check for the return code when getting the
>> vpd size?
>
> Hello Nathan,
>
> This check is already being performed on the handle_vpd_size_rsp() function down below.
>
> In short, a GET_VPD_SIZE signal is sent here through a ibmvnic_crq union in ibmvnic_send_crq(), whereas handle_query_ip_offload_rsp() receives from the VNIC adapter a GET_VPD_SIZE_RSP containing a ibmvnic_crq union with the vpd size information and the rc.code. If successful, a &adapter->fw_done is sent and this part of the code continues; however if not, a dev_error() is thrown. Same logic applies to GET_VPD/GET_VPD_RSP.
>
Yes, I did see that code. You do a complet of the completion variable for both success and failure,
this then lets this routine continue irregardless of the results of the get vpd size request. The
call to dev_err will print the error message but does not prevent use from bailing if the
get vpd size fails. Perhaps setting vpd->len to -1 to indicate the get vpd call failed which could
then be checked by the requester.
-Nathan
> What I am adding on the next version of the patch is a check if adapter->vpd->len is different than 0 before allocating adapter->vpd->buff, since that in a case of a failure, adapter->vpd->len will be 0.
>
> Best Regards,
>
>>
>>
>>> + if (!adapter->vpd->buff)
>>> + adapter->vpd->buff = kzalloc(adapter->vpd->len, GFP_KERNEL);
>>> + else if (adapter->vpd->len != len)
>>> + adapter->vpd->buff =
>>> + krealloc(adapter->vpd->buff,
>>> + adapter->vpd->len, GFP_KERNEL);
>>> +
>>> + if (!adapter->vpd->buff) {
>>> + dev_err(dev, "Could allocate VPD buffer\n");
>>> + return -ENOMEM;
>>> + }
>>> +
>>> + adapter->vpd->dma_addr =
>>> + dma_map_single(dev, adapter->vpd->buff, adapter->vpd->len,
>>> + DMA_FROM_DEVICE);
>>> + if (dma_mapping_error(dev, dma_addr)) {
>>> + dev_err(dev, "Could not map VPD buffer\n");
>>> + return -ENOMEM;
>>> + }
>>> +
>>> + reinit_completion(&adapter->fw_done);
>>> + crq.get_vpd.first = IBMVNIC_CRQ_CMD;
>>> + crq.get_vpd.cmd = GET_VPD;
>>> + crq.get_vpd.ioba = cpu_to_be32(adapter->vpd->dma_addr);
>>> + crq.get_vpd.len = cpu_to_be32((u32)adapter->vpd->len);
>>> + ibmvnic_send_crq(adapter, &crq);
>>> + wait_for_completion(&adapter->fw_done);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> static int init_resources(struct ibmvnic_adapter *adapter)
>>> {
>>> struct net_device *netdev = adapter->netdev;
>>> @@ -850,6 +908,10 @@ static int init_resources(struct ibmvnic_adapter *adapter)
>>> if (rc)
>>> return rc;
>>>
>>> + adapter->vpd = kzalloc(sizeof(*adapter->vpd), GFP_KERNEL);
>>> + if (!adapter->vpd)
>>> + return -ENOMEM;
>>> +
>>> adapter->map_id = 1;
>>> adapter->napi = kcalloc(adapter->req_rx_queues,
>>> sizeof(struct napi_struct), GFP_KERNEL);
>>> @@ -950,6 +1012,10 @@ static int ibmvnic_open(struct net_device *netdev)
>>>
>>> rc = __ibmvnic_open(netdev);
>>> netif_carrier_on(netdev);
>>> +
>>> + /* Vital Product Data (VPD) */
>>> + ibmvnic_get_vpd(adapter);
>>> +
>>> mutex_unlock(&adapter->reset_lock);
>>>
>>> return rc;
>>> @@ -1878,11 +1944,15 @@ static int ibmvnic_get_link_ksettings(struct net_device *netdev,
>>> return 0;
>>> }
>>>
>>> -static void ibmvnic_get_drvinfo(struct net_device *dev,
>>> +static void ibmvnic_get_drvinfo(struct net_device *netdev,
>>> struct ethtool_drvinfo *info)
>>> {
>>> + struct ibmvnic_adapter *adapter = netdev_priv(netdev);
>>> +
>>> strlcpy(info->driver, ibmvnic_driver_name, sizeof(info->driver));
>>> strlcpy(info->version, IBMVNIC_DRIVER_VERSION, sizeof(info->version));
>>> + strlcpy(info->fw_version, adapter->fw_version,
>>> + sizeof(info->fw_version));
>>> }
>>>
>>> static u32 ibmvnic_get_msglevel(struct net_device *netdev)
>>> @@ -3076,6 +3146,77 @@ static void send_cap_queries(struct ibmvnic_adapter *adapter)
>>> ibmvnic_send_crq(adapter, &crq);
>>> }
>>>
>>> +static void handle_vpd_size_rsp(union ibmvnic_crq *crq,
>>> + struct ibmvnic_adapter *adapter)
>>> +{
>>> + struct device *dev = &adapter->vdev->dev;
>>> +
>>> + if (crq->get_vpd_size_rsp.rc.code) {
>>> + dev_err(dev, "Error retrieving VPD size, rc=%x\n",
>>> + crq->get_vpd_size_rsp.rc.code);
>>> + complete(&adapter->fw_done);
>>> + return;
>>> + }
>>> +
>>> + adapter->vpd->len = be64_to_cpu(crq->get_vpd_size_rsp.len);
>>> + complete(&adapter->fw_done);
>>> +}
>>> +
>>> +static void handle_vpd_rsp(union ibmvnic_crq *crq,
>>> + struct ibmvnic_adapter *adapter)
>>> +{
>>> + struct device *dev = &adapter->vdev->dev;
>>> + unsigned char *substr = NULL, *ptr = NULL;
>>> + u8 fw_level_len = 0;
>>> +
>>> + dma_unmap_single(dev, adapter->vpd->dma_addr, adapter->vpd->len,
>>> + DMA_FROM_DEVICE);
>>> +
>>> + if (crq->get_vpd_rsp.rc.code) {
>>> + dev_err(dev, "Error retrieving VPD from device, rc=%x\n",
>>> + crq->get_vpd_rsp.rc.code);
>>> + memset(adapter->fw_version, 0, 32);
>>> + goto complete;
>>> + }
>>> +
>>> + /* get the position of the firmware version info
>>> + * located after the ASCII 'RM' substring in the buffer
>>> + */
>>> + substr = strnstr(adapter->vpd->buff, "RM", adapter->vpd->len);
>>> + if (!substr) {
>>> + dev_info(dev, "No FW level provided by VPD\n");
>>> + memset(adapter->fw_version, 0, 32);
>>> + goto complete;
>>> + }
>>> +
>>> + /* get length of firmware level ASCII substring */
>>> + if ((substr + 2) < (adapter->vpd->buff + adapter->vpd->len)) {
>>> + fw_level_len = *(substr + 2);
>>> + } else {
>>> + dev_info(dev, "Length of FW substr extrapolated VDP buff\n");
>>> + memset(adapter->fw_version, 0, 32);
>>> + goto complete;
>>> + }
>>> +
>>> + /* copy firmware version string from vpd into adapter */
>>> + if ((substr + 3 + fw_level_len) <
>>> + (adapter->vpd->buff + adapter->vpd->len)) {
>>> + ptr = strncpy((char *)adapter->fw_version,
>>> + substr + 3, fw_level_len);
>>> +
>>> + if (!ptr) {
>>> + dev_err(dev, "Failed to isolate FW level string\n");
>>> + memset(adapter->fw_version, 0, 32);
>>> + }
>>> + } else {
>>> + dev_info(dev, "FW substr extrapolated VPD buff\n");
>>> + memset(adapter->fw_version, 0, 32);
>>> + }
>>> +
>>> +complete:
>>> + complete(&adapter->fw_done);
>>> +}
>>> +
>>> static void handle_query_ip_offload_rsp(struct ibmvnic_adapter *adapter)
>>> {
>>> struct device *dev = &adapter->vdev->dev;
>>> @@ -3807,6 +3948,12 @@ static void ibmvnic_handle_crq(union ibmvnic_crq *crq,
>>> netdev_dbg(netdev, "Got Collect firmware trace Response\n");
>>> complete(&adapter->fw_done);
>>> break;
>>> + case GET_VPD_SIZE_RSP:
>>> + handle_vpd_size_rsp(crq, adapter);
>>> + break;
>>> + case GET_VPD_RSP:
>>> + handle_vpd_rsp(crq, adapter);
>>> + break;
>>> default:
>>> netdev_err(netdev, "Got an invalid cmd type 0x%02x\n",
>>> gen_crq->cmd);
>>> diff --git a/drivers/net/ethernet/ibm/ibmvnic.h b/drivers/net/ethernet/ibm/ibmvnic.h
>>> index 4670af8..d3a6959 100644
>>> --- a/drivers/net/ethernet/ibm/ibmvnic.h
>>> +++ b/drivers/net/ethernet/ibm/ibmvnic.h
>>> @@ -558,6 +558,12 @@ struct ibmvnic_multicast_ctrl {
>>> struct ibmvnic_rc rc;
>>> } __packed __aligned(8);
>>>
>>> +struct ibmvnic_get_vpd_size {
>>> + u8 first;
>>> + u8 cmd;
>>> + u8 reserved[14];
>>> +} __packed __aligned(8);
>>> +
>>> struct ibmvnic_get_vpd_size_rsp {
>>> u8 first;
>>> u8 cmd;
>>> @@ -575,6 +581,13 @@ struct ibmvnic_get_vpd {
>>> u8 reserved[4];
>>> } __packed __aligned(8);
>>>
>>> +struct ibmvnic_get_vpd_rsp {
>>> + u8 first;
>>> + u8 cmd;
>>> + u8 reserved[10];
>>> + struct ibmvnic_rc rc;
>>> +} __packed __aligned(8);
>>> +
>>> struct ibmvnic_acl_change_indication {
>>> u8 first;
>>> u8 cmd;
>>> @@ -700,10 +713,10 @@ union ibmvnic_crq {
>>> struct ibmvnic_change_mac_addr change_mac_addr_rsp;
>>> struct ibmvnic_multicast_ctrl multicast_ctrl;
>>> struct ibmvnic_multicast_ctrl multicast_ctrl_rsp;
>>> - struct ibmvnic_generic_crq get_vpd_size;
>>> + struct ibmvnic_get_vpd_size get_vpd_size;
>>> struct ibmvnic_get_vpd_size_rsp get_vpd_size_rsp;
>>> struct ibmvnic_get_vpd get_vpd;
>>> - struct ibmvnic_generic_crq get_vpd_rsp;
>>> + struct ibmvnic_get_vpd_rsp get_vpd_rsp;
>>> struct ibmvnic_acl_change_indication acl_change_indication;
>>> struct ibmvnic_acl_query acl_query;
>>> struct ibmvnic_generic_crq acl_query_rsp;
>>> @@ -937,6 +950,12 @@ struct ibmvnic_error_buff {
>>> __be32 error_id;
>>> };
>>>
>>> +struct ibmvnic_vpd {
>>> + unsigned char *buff;
>>> + dma_addr_t dma_addr;
>>> + u64 len;
>>> +};
>>> +
>>> enum vnic_state {VNIC_PROBING = 1,
>>> VNIC_PROBED,
>>> VNIC_OPENING,
>>> @@ -978,6 +997,10 @@ struct ibmvnic_adapter {
>>> dma_addr_t ip_offload_ctrl_tok;
>>> u32 msg_enable;
>>>
>>> + /* Vital Product Data (VPD) */
>>> + struct ibmvnic_vpd *vpd;
>>> + char fw_version[32];
>>> +
>>> /* Statistics */
>>> struct ibmvnic_statistics stats;
>>> dma_addr_t stats_token;
>>>
>
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