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ixgbe: Add work around for empty SFP+ cage crosstalk

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It is possible on some systems that crosstalk could lead to link flap
on empty SFP+ cages.  A new NVM bit was defined to let SW know it
needs to implement the work around which consists of verifying that
there is a module in the cage before acting on the LSC.

Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Don Skidmore 2016-04-12 19:25:10 -04:00 committed by Jeff Kirsher
parent a0254a70b4
commit 4319a79767
3 changed files with 42 additions and 0 deletions
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2
drivers/net/ethernet/intel/ixgbe/ixgbe.h
View File

@ -803,6 +803,8 @@ struct ixgbe_adapter {
#define IXGBE_RSS_KEY_SIZE 40 /* size of RSS Hash Key in bytes */
u32 rss_key[IXGBE_RSS_KEY_SIZE / sizeof(u32)];
bool need_crosstalk_fix;
};
static inline u8 ixgbe_max_rss_indices(struct ixgbe_adapter *adapter)

39
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
View File

@ -5572,6 +5572,7 @@ static int ixgbe_sw_init(struct ixgbe_adapter *adapter)
struct pci_dev *pdev = adapter->pdev;
unsigned int rss, fdir;
u32 fwsm;
u16 device_caps;
#ifdef CONFIG_IXGBE_DCB
int j;
struct tc_configuration *tc;
@ -5737,6 +5738,22 @@ static int ixgbe_sw_init(struct ixgbe_adapter *adapter)
adapter->tx_ring_count = IXGBE_DEFAULT_TXD;
adapter->rx_ring_count = IXGBE_DEFAULT_RXD;
/* Cache bit indicating need for crosstalk fix */
switch (hw->mac.type) {
case ixgbe_mac_82599EB:
case ixgbe_mac_X550EM_x:
case ixgbe_mac_x550em_a:
hw->mac.ops.get_device_caps(hw, &device_caps);
if (device_caps & IXGBE_DEVICE_CAPS_NO_CROSSTALK_WR)
adapter->need_crosstalk_fix = false;
else
adapter->need_crosstalk_fix = true;
break;
default:
adapter->need_crosstalk_fix = false;
break;
}
/* set default work limits */
adapter->tx_work_limit = IXGBE_DEFAULT_TX_WORK;
@ -6659,6 +6676,18 @@ static void ixgbe_watchdog_update_link(struct ixgbe_adapter *adapter)
link_up = true;
}
/* If Crosstalk fix enabled do the sanity check of making sure
* the SFP+ cage is empty.
*/
if (adapter->need_crosstalk_fix) {
u32 sfp_cage_full;
sfp_cage_full = IXGBE_READ_REG(hw, IXGBE_ESDP) &
IXGBE_ESDP_SDP2;
if (ixgbe_is_sfp(hw) && link_up && !sfp_cage_full)
link_up = false;
}
if (adapter->ixgbe_ieee_pfc)
pfc_en |= !!(adapter->ixgbe_ieee_pfc->pfc_en);
@ -7005,6 +7034,16 @@ static void ixgbe_sfp_detection_subtask(struct ixgbe_adapter *adapter)
struct ixgbe_hw *hw = &adapter->hw;
s32 err;
/* If crosstalk fix enabled verify the SFP+ cage is full */
if (adapter->need_crosstalk_fix) {
u32 sfp_cage_full;
sfp_cage_full = IXGBE_READ_REG(hw, IXGBE_ESDP) &
IXGBE_ESDP_SDP2;
if (!sfp_cage_full)
return;
}
/* not searching for SFP so there is nothing to do here */
if (!(adapter->flags2 & IXGBE_FLAG2_SEARCH_FOR_SFP) &&
!(adapter->flags2 & IXGBE_FLAG2_SFP_NEEDS_RESET))

1
drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
View File

@ -2124,6 +2124,7 @@ enum {
#define IXGBE_SAN_MAC_ADDR_PORT1_OFFSET 0x3
#define IXGBE_DEVICE_CAPS_ALLOW_ANY_SFP 0x1
#define IXGBE_DEVICE_CAPS_FCOE_OFFLOADS 0x2
#define IXGBE_DEVICE_CAPS_NO_CROSSTALK_WR BIT(7)
#define IXGBE_FW_LESM_PARAMETERS_PTR 0x2
#define IXGBE_FW_LESM_STATE_1 0x1
#define IXGBE_FW_LESM_STATE_ENABLED 0x8000 /* LESM Enable bit */