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i40e: Add code to handle FD table full condition

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Add code to enforce the following policy:
- If the HW reports filter programming error, we check if it's due to a
  full table.
- If so, we go ahead and turn off new rule addition for ATR and then SB
  in that order.
- We monitor the programmed filter count, if enough room is created due
  to filter deletion/reset, we then re-enable SB and ATR new rule addition.

Change-ID: I69d24b29e5c45bc4fa861258e11c2fa7b8868748
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Signed-off-by: Catherine Sullivan <catherine.sullivan@intel.com>
Tested-by: Kavindya Deegala <kavindya.s.deegala@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Anjali Singhai Jain 2014-02-12 06:33:25 +00:00 committed by Jeff Kirsher
parent 61dade7e92
commit 55a5e60b9f
5 changed files with 135 additions and 17 deletions
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7
drivers/net/ethernet/intel/i40e/i40e.h
View File

@ -152,7 +152,10 @@ struct i40e_lump_tracking {
};
#define I40E_DEFAULT_ATR_SAMPLE_RATE 20
#define I40E_FDIR_MAX_RAW_PACKET_SIZE 512
#define I40E_FDIR_MAX_RAW_PACKET_SIZE 512
#define I40E_FDIR_BUFFER_FULL_MARGIN 10
#define I40E_FDIR_BUFFER_HEAD_ROOM 200
struct i40e_fdir_filter {
struct hlist_node fdir_node;
/* filter ipnut set */
@ -553,6 +556,8 @@ int i40e_program_fdir_filter(struct i40e_fdir_filter *fdir_data, u8 *raw_packet,
struct i40e_pf *pf, bool add);
int i40e_add_del_fdir(struct i40e_vsi *vsi,
struct i40e_fdir_filter *input, bool add);
void i40e_fdir_check_and_reenable(struct i40e_pf *pf);
int i40e_get_current_fd_count(struct i40e_pf *pf);
void i40e_set_ethtool_ops(struct net_device *netdev);
struct i40e_mac_filter *i40e_add_filter(struct i40e_vsi *vsi,
u8 *macaddr, s16 vlan,

17
drivers/net/ethernet/intel/i40e/i40e_debugfs.c
View File

@ -1011,10 +1011,12 @@ static void i40e_dbg_dump_veb_all(struct i40e_pf *pf)
**/
static void i40e_dbg_cmd_fd_ctrl(struct i40e_pf *pf, u64 flag, bool enable)
{
if (enable)
if (enable) {
pf->flags |= flag;
else
} else {
pf->flags &= ~flag;
pf->auto_disable_flags |= flag;
}
dev_info(&pf->pdev->dev, "requesting a pf reset\n");
i40e_do_reset_safe(pf, (1 << __I40E_PF_RESET_REQUESTED));
}
@ -1670,6 +1672,15 @@ static ssize_t i40e_dbg_command_write(struct file *filp,
bool add = false;
int ret;
if (!(pf->flags & I40E_FLAG_FD_SB_ENABLED))
goto command_write_done;
if (strncmp(cmd_buf, "add", 3) == 0)
add = true;
if (add && (pf->auto_disable_flags & I40E_FLAG_FD_SB_ENABLED))
goto command_write_done;
asc_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_SIZE,
GFP_KERNEL);
if (!asc_packet)
@ -1684,8 +1695,6 @@ static ssize_t i40e_dbg_command_write(struct file *filp,
goto command_write_done;
}
if (strncmp(cmd_buf, "add", 3) == 0)
add = true;
cnt = sscanf(&cmd_buf[13],
"%hx %2hhx %2hhx %hx %2hhx %2hhx %hx %x %hd %511s",
&fd_data.q_index,

10
drivers/net/ethernet/intel/i40e/i40e_ethtool.c
View File

@ -1460,6 +1460,7 @@ static int i40e_del_fdir_entry(struct i40e_vsi *vsi,
ret = i40e_update_ethtool_fdir_entry(vsi, NULL, fsp->location, cmd);
i40e_fdir_check_and_reenable(pf);
return ret;
}
@ -1483,9 +1484,16 @@ static int i40e_add_del_fdir_ethtool(struct i40e_vsi *vsi,
if (!vsi)
return -EINVAL;
fsp = (struct ethtool_rx_flow_spec *)&cmd->fs;
pf = vsi->back;
if (!(pf->flags & I40E_FLAG_FD_SB_ENABLED))
return -EOPNOTSUPP;
if (add && (pf->auto_disable_flags & I40E_FLAG_FD_SB_ENABLED))
return -ENOSPC;
fsp = (struct ethtool_rx_flow_spec *)&cmd->fs;
if (fsp->location >= (pf->hw.func_caps.fd_filters_best_effort +
pf->hw.func_caps.fd_filters_guaranteed)) {
return -EINVAL;

58
drivers/net/ethernet/intel/i40e/i40e_main.c
View File

@ -2436,6 +2436,9 @@ static void i40e_fdir_filter_restore(struct i40e_vsi *vsi)
struct i40e_pf *pf = vsi->back;
struct hlist_node *node;
if (!(pf->flags & I40E_FLAG_FD_SB_ENABLED))
return;
hlist_for_each_entry_safe(filter, node,
&pf->fdir_filter_list, fdir_node) {
i40e_add_del_fdir(vsi, filter, true);
@ -4623,6 +4626,54 @@ static void i40e_service_event_complete(struct i40e_pf *pf)
clear_bit(__I40E_SERVICE_SCHED, &pf->state);
}
/**
* i40e_get_current_fd_count - Get the count of FD filters programmed in the HW
* @pf: board private structure
**/
int i40e_get_current_fd_count(struct i40e_pf *pf)
{
int val, fcnt_prog;
val = rd32(&pf->hw, I40E_PFQF_FDSTAT);
fcnt_prog = (val & I40E_PFQF_FDSTAT_GUARANT_CNT_MASK) +
((val & I40E_PFQF_FDSTAT_BEST_CNT_MASK) >>
I40E_PFQF_FDSTAT_BEST_CNT_SHIFT);
return fcnt_prog;
}
/**
* i40e_fdir_check_and_reenable - Function to reenabe FD ATR or SB if disabled
* @pf: board private structure
**/
void i40e_fdir_check_and_reenable(struct i40e_pf *pf)
{
u32 fcnt_prog, fcnt_avail;
/* Check if, FD SB or ATR was auto disabled and if there is enough room
* to re-enable
*/
if ((pf->flags & I40E_FLAG_FD_ATR_ENABLED) &&
(pf->flags & I40E_FLAG_FD_SB_ENABLED))
return;
fcnt_prog = i40e_get_current_fd_count(pf);
fcnt_avail = pf->hw.fdir_shared_filter_count +
pf->fdir_pf_filter_count;
if (fcnt_prog < (fcnt_avail - I40E_FDIR_BUFFER_HEAD_ROOM)) {
if ((pf->flags & I40E_FLAG_FD_SB_ENABLED) &&
(pf->auto_disable_flags & I40E_FLAG_FD_SB_ENABLED)) {
pf->auto_disable_flags &= ~I40E_FLAG_FD_SB_ENABLED;
dev_info(&pf->pdev->dev, "FD Sideband/ntuple is being enabled since we have space in the table now\n");
}
}
/* Wait for some more space to be available to turn on ATR */
if (fcnt_prog < (fcnt_avail - I40E_FDIR_BUFFER_HEAD_ROOM * 2)) {
if ((pf->flags & I40E_FLAG_FD_ATR_ENABLED) &&
(pf->auto_disable_flags & I40E_FLAG_FD_ATR_ENABLED)) {
pf->auto_disable_flags &= ~I40E_FLAG_FD_ATR_ENABLED;
dev_info(&pf->pdev->dev, "ATR is being enabled since we have space in the table now\n");
}
}
}
/**
* i40e_fdir_reinit_subtask - Worker thread to reinit FDIR filter table
* @pf: board private structure
@ -4632,11 +4683,14 @@ static void i40e_fdir_reinit_subtask(struct i40e_pf *pf)
if (!(pf->flags & I40E_FLAG_FDIR_REQUIRES_REINIT))
return;
pf->flags &= ~I40E_FLAG_FDIR_REQUIRES_REINIT;
/* if interface is down do nothing */
if (test_bit(__I40E_DOWN, &pf->state))
return;
i40e_fdir_check_and_reenable(pf);
if ((pf->flags & I40E_FLAG_FD_ATR_ENABLED) &&
(pf->flags & I40E_FLAG_FD_SB_ENABLED))
pf->flags &= ~I40E_FLAG_FDIR_REQUIRES_REINIT;
}
/**

60
drivers/net/ethernet/intel/i40e/i40e_txrx.c
View File

@ -430,23 +430,61 @@ int i40e_add_del_fdir(struct i40e_vsi *vsi,
/**
* i40e_fd_handle_status - check the Programming Status for FD
* @rx_ring: the Rx ring for this descriptor
* @qw: the descriptor data
* @rx_desc: the Rx descriptor for programming Status, not a packet descriptor.
* @prog_id: the id originally used for programming
*
* This is used to verify if the FD programming or invalidation
* requested by SW to the HW is successful or not and take actions accordingly.
**/
static void i40e_fd_handle_status(struct i40e_ring *rx_ring, u32 qw, u8 prog_id)
static void i40e_fd_handle_status(struct i40e_ring *rx_ring,
union i40e_rx_desc *rx_desc, u8 prog_id)
{
struct pci_dev *pdev = rx_ring->vsi->back->pdev;
struct i40e_pf *pf = rx_ring->vsi->back;
struct pci_dev *pdev = pf->pdev;
u32 fcnt_prog, fcnt_avail;
u32 error;
u64 qw;
qw = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
error = (qw & I40E_RX_PROG_STATUS_DESC_QW1_ERROR_MASK) >>
I40E_RX_PROG_STATUS_DESC_QW1_ERROR_SHIFT;
/* for now just print the Status */
dev_info(&pdev->dev, "FD programming id %02x, Status %08x\n",
prog_id, error);
if (error == (0x1 << I40E_RX_PROG_STATUS_DESC_FD_TBL_FULL_SHIFT)) {
dev_warn(&pdev->dev, "ntuple filter loc = %d, could not be added\n",
rx_desc->wb.qword0.hi_dword.fd_id);
/* filter programming failed most likely due to table full */
fcnt_prog = i40e_get_current_fd_count(pf);
fcnt_avail = pf->hw.fdir_shared_filter_count +
pf->fdir_pf_filter_count;
/* If ATR is running fcnt_prog can quickly change,
* if we are very close to full, it makes sense to disable
* FD ATR/SB and then re-enable it when there is room.
*/
if (fcnt_prog >= (fcnt_avail - I40E_FDIR_BUFFER_FULL_MARGIN)) {
/* Turn off ATR first */
if (pf->flags | I40E_FLAG_FD_ATR_ENABLED) {
pf->flags &= ~I40E_FLAG_FD_ATR_ENABLED;
dev_warn(&pdev->dev, "FD filter space full, ATR for further flows will be turned off\n");
pf->auto_disable_flags |=
I40E_FLAG_FD_ATR_ENABLED;
pf->flags |= I40E_FLAG_FDIR_REQUIRES_REINIT;
} else if (pf->flags | I40E_FLAG_FD_SB_ENABLED) {
pf->flags &= ~I40E_FLAG_FD_SB_ENABLED;
dev_warn(&pdev->dev, "FD filter space full, new ntuple rules will not be added\n");
pf->auto_disable_flags |=
I40E_FLAG_FD_SB_ENABLED;
pf->flags |= I40E_FLAG_FDIR_REQUIRES_REINIT;
}
} else {
dev_info(&pdev->dev, "FD filter programming error");
}
} else if (error ==
(0x1 << I40E_RX_PROG_STATUS_DESC_NO_FD_ENTRY_SHIFT)) {
netdev_info(rx_ring->vsi->netdev, "ntuple filter loc = %d, could not be removed\n",
rx_desc->wb.qword0.hi_dword.fd_id);
}
}
/**
@ -843,7 +881,7 @@ static void i40e_clean_programming_status(struct i40e_ring *rx_ring,
I40E_RX_PROG_STATUS_DESC_QW1_PROGID_SHIFT;
if (id == I40E_RX_PROG_STATUS_DESC_FD_FILTER_STATUS)
i40e_fd_handle_status(rx_ring, qw, id);
i40e_fd_handle_status(rx_ring, rx_desc, id);
}
/**
@ -1536,8 +1574,6 @@ static void i40e_atr(struct i40e_ring *tx_ring, struct sk_buff *skb,
if (!tx_ring->atr_sample_rate)
return;
tx_ring->atr_count++;
/* snag network header to get L4 type and address */
hdr.network = skb_network_header(skb);
@ -1559,6 +1595,12 @@ static void i40e_atr(struct i40e_ring *tx_ring, struct sk_buff *skb,
th = (struct tcphdr *)(hdr.network + hlen);
/* Due to lack of space, no more new filters can be programmed */
if (th->syn && (pf->auto_disable_flags & I40E_FLAG_FD_ATR_ENABLED))
return;
tx_ring->atr_count++;
/* sample on all syn/fin packets or once every atr sample rate */
if (!th->fin && !th->syn && (tx_ring->atr_count < tx_ring->atr_sample_rate))
return;