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linux-next/drivers/net/ethernet/intel/i40e/i40e_dcb.c
Neerav Parikh 71f6a85a58 i40e: Fix static checker warning 
This patch fixes the following static checker warning:

  drivers/net/ethernet/intel/i40e/i40e_dcb.c:342
  i40e_lldp_to_dcb_config() warn: 'tlv' can't be NULL.

Exit criteria from the while loop is encountering LLDP END
LV or if the TLV length goes beyond the buffer length.

Change-ID: I7548b16db90230ec2ba0fa791b0343ca8b7dd5bb
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Neerav Parikh <Neerav.Parikh@intel.com>
Acked-by: Shannon Nelson <shannon.nelson@intel.com>
Signed-off-by: Kevin Scott <kevin.c.scott@intel.com>
Signed-off-by: Catherine Sullivan <catherine.sullivan@intel.com>
Tested-by: Kavindya Deegala <kavindya.s.deegala@intel.com>
Tested-By: Jack Morgan<jack.morgan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
2014-03-06 18:41:50 -08:00

473 lines
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/*******************************************************************************
*
* Intel Ethernet Controller XL710 Family Linux Driver
* Copyright(c) 2013 - 2014 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*
* The full GNU General Public License is included in this distribution in
* the file called "COPYING".
*
* Contact Information:
* e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
******************************************************************************/
#include "i40e_adminq.h"
#include "i40e_prototype.h"
#include "i40e_dcb.h"
/**
* i40e_get_dcbx_status
* @hw: pointer to the hw struct
* @status: Embedded DCBX Engine Status
*
* Get the DCBX status from the Firmware
**/
i40e_status i40e_get_dcbx_status(struct i40e_hw *hw, u16 *status)
{
u32 reg;
if (!status)
return I40E_ERR_PARAM;
reg = rd32(hw, I40E_PRTDCB_GENS);
*status = (u16)((reg & I40E_PRTDCB_GENS_DCBX_STATUS_MASK) >>
I40E_PRTDCB_GENS_DCBX_STATUS_SHIFT);
return 0;
}
/**
* i40e_parse_ieee_etscfg_tlv
* @tlv: IEEE 802.1Qaz ETS CFG TLV
* @dcbcfg: Local store to update ETS CFG data
*
* Parses IEEE 802.1Qaz ETS CFG TLV
**/
static void i40e_parse_ieee_etscfg_tlv(struct i40e_lldp_org_tlv *tlv,
struct i40e_dcbx_config *dcbcfg)
{
struct i40e_ieee_ets_config *etscfg;
u8 *buf = tlv->tlvinfo;
u16 offset = 0;
u8 priority;
int i;
/* First Octet post subtype
* --------------------------
* |will-|CBS | Re- | Max |
* |ing | |served| TCs |
* --------------------------
* |1bit | 1bit|3 bits|3bits|
*/
etscfg = &dcbcfg->etscfg;
etscfg->willing = (u8)((buf[offset] & I40E_IEEE_ETS_WILLING_MASK) >>
I40E_IEEE_ETS_WILLING_SHIFT);
etscfg->cbs = (u8)((buf[offset] & I40E_IEEE_ETS_CBS_MASK) >>
I40E_IEEE_ETS_CBS_SHIFT);
etscfg->maxtcs = (u8)((buf[offset] & I40E_IEEE_ETS_MAXTC_MASK) >>
I40E_IEEE_ETS_MAXTC_SHIFT);
/* Move offset to Priority Assignment Table */
offset++;
/* Priority Assignment Table (4 octets)
* Octets:| 1 | 2 | 3 | 4 |
* -----------------------------------------
* |pri0|pri1|pri2|pri3|pri4|pri5|pri6|pri7|
* -----------------------------------------
* Bits:|7 4|3 0|7 4|3 0|7 4|3 0|7 4|3 0|
* -----------------------------------------
*/
for (i = 0; i < 4; i++) {
priority = (u8)((buf[offset] & I40E_IEEE_ETS_PRIO_1_MASK) >>
I40E_IEEE_ETS_PRIO_1_SHIFT);
etscfg->prioritytable[i * 2] = priority;
priority = (u8)((buf[offset] & I40E_IEEE_ETS_PRIO_0_MASK) >>
I40E_IEEE_ETS_PRIO_0_SHIFT);
etscfg->prioritytable[i * 2 + 1] = priority;
offset++;
}
/* TC Bandwidth Table (8 octets)
* Octets:| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
* ---------------------------------
* |tc0|tc1|tc2|tc3|tc4|tc5|tc6|tc7|
* ---------------------------------
*/
for (i = 0; i < I40E_MAX_TRAFFIC_CLASS; i++)
etscfg->tcbwtable[i] = buf[offset++];
/* TSA Assignment Table (8 octets)
* Octets:| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
* ---------------------------------
* |tc0|tc1|tc2|tc3|tc4|tc5|tc6|tc7|
* ---------------------------------
*/
for (i = 0; i < I40E_MAX_TRAFFIC_CLASS; i++)
etscfg->tsatable[i] = buf[offset++];
}
/**
* i40e_parse_ieee_etsrec_tlv
* @tlv: IEEE 802.1Qaz ETS REC TLV
* @dcbcfg: Local store to update ETS REC data
*
* Parses IEEE 802.1Qaz ETS REC TLV
**/
static void i40e_parse_ieee_etsrec_tlv(struct i40e_lldp_org_tlv *tlv,
struct i40e_dcbx_config *dcbcfg)
{
u8 *buf = tlv->tlvinfo;
u16 offset = 0;
u8 priority;
int i;
/* Move offset to priority table */
offset++;
/* Priority Assignment Table (4 octets)
* Octets:| 1 | 2 | 3 | 4 |
* -----------------------------------------
* |pri0|pri1|pri2|pri3|pri4|pri5|pri6|pri7|
* -----------------------------------------
* Bits:|7 4|3 0|7 4|3 0|7 4|3 0|7 4|3 0|
* -----------------------------------------
*/
for (i = 0; i < 4; i++) {
priority = (u8)((buf[offset] & I40E_IEEE_ETS_PRIO_1_MASK) >>
I40E_IEEE_ETS_PRIO_1_SHIFT);
dcbcfg->etsrec.prioritytable[i*2] = priority;
priority = (u8)((buf[offset] & I40E_IEEE_ETS_PRIO_0_MASK) >>
I40E_IEEE_ETS_PRIO_0_SHIFT);
dcbcfg->etsrec.prioritytable[i*2 + 1] = priority;
offset++;
}
/* TC Bandwidth Table (8 octets)
* Octets:| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
* ---------------------------------
* |tc0|tc1|tc2|tc3|tc4|tc5|tc6|tc7|
* ---------------------------------
*/
for (i = 0; i < I40E_MAX_TRAFFIC_CLASS; i++)
dcbcfg->etsrec.tcbwtable[i] = buf[offset++];
/* TSA Assignment Table (8 octets)
* Octets:| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
* ---------------------------------
* |tc0|tc1|tc2|tc3|tc4|tc5|tc6|tc7|
* ---------------------------------
*/
for (i = 0; i < I40E_MAX_TRAFFIC_CLASS; i++)
dcbcfg->etsrec.tsatable[i] = buf[offset++];
}
/**
* i40e_parse_ieee_pfccfg_tlv
* @tlv: IEEE 802.1Qaz PFC CFG TLV
* @dcbcfg: Local store to update PFC CFG data
*
* Parses IEEE 802.1Qaz PFC CFG TLV
**/
static void i40e_parse_ieee_pfccfg_tlv(struct i40e_lldp_org_tlv *tlv,
struct i40e_dcbx_config *dcbcfg)
{
u8 *buf = tlv->tlvinfo;
/* ----------------------------------------
* |will-|MBC | Re- | PFC | PFC Enable |
* |ing | |served| cap | |
* -----------------------------------------
* |1bit | 1bit|2 bits|4bits| 1 octet |
*/
dcbcfg->pfc.willing = (u8)((buf[0] & I40E_IEEE_PFC_WILLING_MASK) >>
I40E_IEEE_PFC_WILLING_SHIFT);
dcbcfg->pfc.mbc = (u8)((buf[0] & I40E_IEEE_PFC_MBC_MASK) >>
I40E_IEEE_PFC_MBC_SHIFT);
dcbcfg->pfc.pfccap = (u8)((buf[0] & I40E_IEEE_PFC_CAP_MASK) >>
I40E_IEEE_PFC_CAP_SHIFT);
dcbcfg->pfc.pfcenable = buf[1];
}
/**
* i40e_parse_ieee_app_tlv
* @tlv: IEEE 802.1Qaz APP TLV
* @dcbcfg: Local store to update APP PRIO data
*
* Parses IEEE 802.1Qaz APP PRIO TLV
**/
static void i40e_parse_ieee_app_tlv(struct i40e_lldp_org_tlv *tlv,
struct i40e_dcbx_config *dcbcfg)
{
u16 typelength;
u16 offset = 0;
u16 length;
int i = 0;
u8 *buf;
typelength = ntohs(tlv->typelength);
length = (u16)((typelength & I40E_LLDP_TLV_LEN_MASK) >>
I40E_LLDP_TLV_LEN_SHIFT);
buf = tlv->tlvinfo;
/* The App priority table starts 5 octets after TLV header */
length -= (sizeof(tlv->ouisubtype) + 1);
/* Move offset to App Priority Table */
offset++;
/* Application Priority Table (3 octets)
* Octets:| 1 | 2 | 3 |
* -----------------------------------------
* |Priority|Rsrvd| Sel | Protocol ID |
* -----------------------------------------
* Bits:|23 21|20 19|18 16|15 0|
* -----------------------------------------
*/
while (offset < length) {
dcbcfg->app[i].priority = (u8)((buf[offset] &
I40E_IEEE_APP_PRIO_MASK) >>
I40E_IEEE_APP_PRIO_SHIFT);
dcbcfg->app[i].selector = (u8)((buf[offset] &
I40E_IEEE_APP_SEL_MASK) >>
I40E_IEEE_APP_SEL_SHIFT);
dcbcfg->app[i].protocolid = (buf[offset + 1] << 0x8) |
buf[offset + 2];
/* Move to next app */
offset += 3;
i++;
if (i >= I40E_DCBX_MAX_APPS)
break;
}
dcbcfg->numapps = i;
}
/**
* i40e_parse_ieee_etsrec_tlv
* @tlv: IEEE 802.1Qaz TLV
* @dcbcfg: Local store to update ETS REC data
*
* Get the TLV subtype and send it to parsing function
* based on the subtype value
**/
static void i40e_parse_ieee_tlv(struct i40e_lldp_org_tlv *tlv,
struct i40e_dcbx_config *dcbcfg)
{
u32 ouisubtype;
u8 subtype;
ouisubtype = ntohl(tlv->ouisubtype);
subtype = (u8)((ouisubtype & I40E_LLDP_TLV_SUBTYPE_MASK) >>
I40E_LLDP_TLV_SUBTYPE_SHIFT);
switch (subtype) {
case I40E_IEEE_SUBTYPE_ETS_CFG:
i40e_parse_ieee_etscfg_tlv(tlv, dcbcfg);
break;
case I40E_IEEE_SUBTYPE_ETS_REC:
i40e_parse_ieee_etsrec_tlv(tlv, dcbcfg);
break;
case I40E_IEEE_SUBTYPE_PFC_CFG:
i40e_parse_ieee_pfccfg_tlv(tlv, dcbcfg);
break;
case I40E_IEEE_SUBTYPE_APP_PRI:
i40e_parse_ieee_app_tlv(tlv, dcbcfg);
break;
default:
break;
}
}
/**
* i40e_parse_org_tlv
* @tlv: Organization specific TLV
* @dcbcfg: Local store to update ETS REC data
*
* Currently only IEEE 802.1Qaz TLV is supported, all others
* will be returned
**/
static void i40e_parse_org_tlv(struct i40e_lldp_org_tlv *tlv,
struct i40e_dcbx_config *dcbcfg)
{
u32 ouisubtype;
u32 oui;
ouisubtype = ntohl(tlv->ouisubtype);
oui = (u32)((ouisubtype & I40E_LLDP_TLV_OUI_MASK) >>
I40E_LLDP_TLV_OUI_SHIFT);
switch (oui) {
case I40E_IEEE_8021QAZ_OUI:
i40e_parse_ieee_tlv(tlv, dcbcfg);
break;
default:
break;
}
}
/**
* i40e_lldp_to_dcb_config
* @lldpmib: LLDPDU to be parsed
* @dcbcfg: store for LLDPDU data
*
* Parse DCB configuration from the LLDPDU
**/
i40e_status i40e_lldp_to_dcb_config(u8 *lldpmib,
struct i40e_dcbx_config *dcbcfg)
{
i40e_status ret = 0;
struct i40e_lldp_org_tlv *tlv;
u16 type;
u16 length;
u16 typelength;
u16 offset = 0;
if (!lldpmib || !dcbcfg)
return I40E_ERR_PARAM;
/* set to the start of LLDPDU */
lldpmib += ETH_HLEN;
tlv = (struct i40e_lldp_org_tlv *)lldpmib;
while (1) {
typelength = ntohs(tlv->typelength);
type = (u16)((typelength & I40E_LLDP_TLV_TYPE_MASK) >>
I40E_LLDP_TLV_TYPE_SHIFT);
length = (u16)((typelength & I40E_LLDP_TLV_LEN_MASK) >>
I40E_LLDP_TLV_LEN_SHIFT);
offset += sizeof(typelength) + length;
/* END TLV or beyond LLDPDU size */
if ((type == I40E_TLV_TYPE_END) || (offset > I40E_LLDPDU_SIZE))
break;
switch (type) {
case I40E_TLV_TYPE_ORG:
i40e_parse_org_tlv(tlv, dcbcfg);
break;
default:
break;
}
/* Move to next TLV */
tlv = (struct i40e_lldp_org_tlv *)((char *)tlv +
sizeof(tlv->typelength) +
length);
}
return ret;
}
/**
* i40e_aq_get_dcb_config
* @hw: pointer to the hw struct
* @mib_type: mib type for the query
* @bridgetype: bridge type for the query (remote)
* @dcbcfg: store for LLDPDU data
*
* Query DCB configuration from the Firmware
**/
i40e_status i40e_aq_get_dcb_config(struct i40e_hw *hw, u8 mib_type,
u8 bridgetype,
struct i40e_dcbx_config *dcbcfg)
{
i40e_status ret = 0;
struct i40e_virt_mem mem;
u8 *lldpmib;
/* Allocate the LLDPDU */
ret = i40e_allocate_virt_mem(hw, &mem, I40E_LLDPDU_SIZE);
if (ret)
return ret;
lldpmib = (u8 *)mem.va;
ret = i40e_aq_get_lldp_mib(hw, bridgetype, mib_type,
(void *)lldpmib, I40E_LLDPDU_SIZE,
NULL, NULL, NULL);
if (ret)
goto free_mem;
/* Parse LLDP MIB to get dcb configuration */
ret = i40e_lldp_to_dcb_config(lldpmib, dcbcfg);
free_mem:
i40e_free_virt_mem(hw, &mem);
return ret;
}
/**
* i40e_get_dcb_config
* @hw: pointer to the hw struct
*
* Get DCB configuration from the Firmware
**/
i40e_status i40e_get_dcb_config(struct i40e_hw *hw)
{
i40e_status ret = 0;
/* Get Local DCB Config */
ret = i40e_aq_get_dcb_config(hw, I40E_AQ_LLDP_MIB_LOCAL, 0,
&hw->local_dcbx_config);
if (ret)
goto out;
/* Get Remote DCB Config */
ret = i40e_aq_get_dcb_config(hw, I40E_AQ_LLDP_MIB_REMOTE,
I40E_AQ_LLDP_BRIDGE_TYPE_NEAREST_BRIDGE,
&hw->remote_dcbx_config);
out:
return ret;
}
/**
* i40e_init_dcb
* @hw: pointer to the hw struct
*
* Update DCB configuration from the Firmware
**/
i40e_status i40e_init_dcb(struct i40e_hw *hw)
{
i40e_status ret = 0;
if (!hw->func_caps.dcb)
return ret;
/* Get DCBX status */
ret = i40e_get_dcbx_status(hw, &hw->dcbx_status);
if (ret)
return ret;
/* Check the DCBX Status */
switch (hw->dcbx_status) {
case I40E_DCBX_STATUS_DONE:
case I40E_DCBX_STATUS_IN_PROGRESS:
/* Get current DCBX configuration */
ret = i40e_get_dcb_config(hw);
break;
case I40E_DCBX_STATUS_DISABLED:
return ret;
case I40E_DCBX_STATUS_NOT_STARTED:
case I40E_DCBX_STATUS_MULTIPLE_PEERS:
default:
break;
}
/* Configure the LLDP MIB change event */
ret = i40e_aq_cfg_lldp_mib_change_event(hw, true, NULL);
if (ret)
return ret;
return ret;
}
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