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i40e_txrx.c
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i40e_txrx.c
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// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2013 - 2018 Intel Corporation. */
#include <linux/prefetch.h>
#include <linux/bpf_trace.h>
#include <net/mpls.h>
#include <net/xdp.h>
#include "i40e.h"
#include "i40e_trace.h"
#include "i40e_prototype.h"
#include "i40e_txrx_common.h"
#include "i40e_xsk.h"
#define I40E_TXD_CMD (I40E_TX_DESC_CMD_EOP | I40E_TX_DESC_CMD_RS)
/**
* i40e_fdir - Generate a Flow Director descriptor based on fdata
* @tx_ring: Tx ring to send buffer on
* @fdata: Flow director filter data
* @add: Indicate if we are adding a rule or deleting one
*
**/
static void i40e_fdir(struct i40e_ring *tx_ring,
struct i40e_fdir_filter *fdata, bool add)
{
struct i40e_filter_program_desc *fdir_desc;
struct i40e_pf *pf = tx_ring->vsi->back;
u32 flex_ptype, dtype_cmd;
u16 i;
/* grab the next descriptor */
i = tx_ring->next_to_use;
fdir_desc = I40E_TX_FDIRDESC(tx_ring, i);
i++;
tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;
flex_ptype = I40E_TXD_FLTR_QW0_QINDEX_MASK &
(fdata->q_index << I40E_TXD_FLTR_QW0_QINDEX_SHIFT);
flex_ptype |= I40E_TXD_FLTR_QW0_FLEXOFF_MASK &
(fdata->flex_off << I40E_TXD_FLTR_QW0_FLEXOFF_SHIFT);
flex_ptype |= I40E_TXD_FLTR_QW0_PCTYPE_MASK &
(fdata->pctype << I40E_TXD_FLTR_QW0_PCTYPE_SHIFT);
/* Use LAN VSI Id if not programmed by user */
flex_ptype |= I40E_TXD_FLTR_QW0_DEST_VSI_MASK &
((u32)(fdata->dest_vsi ? : pf->vsi[pf->lan_vsi]->id) <<
I40E_TXD_FLTR_QW0_DEST_VSI_SHIFT);
dtype_cmd = I40E_TX_DESC_DTYPE_FILTER_PROG;
dtype_cmd |= add ?
I40E_FILTER_PROGRAM_DESC_PCMD_ADD_UPDATE <<
I40E_TXD_FLTR_QW1_PCMD_SHIFT :
I40E_FILTER_PROGRAM_DESC_PCMD_REMOVE <<
I40E_TXD_FLTR_QW1_PCMD_SHIFT;
dtype_cmd |= I40E_TXD_FLTR_QW1_DEST_MASK &
(fdata->dest_ctl << I40E_TXD_FLTR_QW1_DEST_SHIFT);
dtype_cmd |= I40E_TXD_FLTR_QW1_FD_STATUS_MASK &
(fdata->fd_status << I40E_TXD_FLTR_QW1_FD_STATUS_SHIFT);
if (fdata->cnt_index) {
dtype_cmd |= I40E_TXD_FLTR_QW1_CNT_ENA_MASK;
dtype_cmd |= I40E_TXD_FLTR_QW1_CNTINDEX_MASK &
((u32)fdata->cnt_index <<
I40E_TXD_FLTR_QW1_CNTINDEX_SHIFT);
}
fdir_desc->qindex_flex_ptype_vsi = cpu_to_le32(flex_ptype);
fdir_desc->rsvd = cpu_to_le32(0);
fdir_desc->dtype_cmd_cntindex = cpu_to_le32(dtype_cmd);
fdir_desc->fd_id = cpu_to_le32(fdata->fd_id);
}
#define I40E_FD_CLEAN_DELAY 10
/**
* i40e_program_fdir_filter - Program a Flow Director filter
* @fdir_data: Packet data that will be filter parameters
* @raw_packet: the pre-allocated packet buffer for FDir
* @pf: The PF pointer
* @add: True for add/update, False for remove
**/
static int i40e_program_fdir_filter(struct i40e_fdir_filter *fdir_data,
u8 *raw_packet, struct i40e_pf *pf,
bool add)
{
struct i40e_tx_buffer *tx_buf, *first;
struct i40e_tx_desc *tx_desc;
struct i40e_ring *tx_ring;
struct i40e_vsi *vsi;
struct device *dev;
dma_addr_t dma;
u32 td_cmd = 0;
u16 i;
/* find existing FDIR VSI */
vsi = i40e_find_vsi_by_type(pf, I40E_VSI_FDIR);
if (!vsi)
return -ENOENT;
tx_ring = vsi->tx_rings[0];
dev = tx_ring->dev;
/* we need two descriptors to add/del a filter and we can wait */
for (i = I40E_FD_CLEAN_DELAY; I40E_DESC_UNUSED(tx_ring) < 2; i--) {
if (!i)
return -EAGAIN;
msleep_interruptible(1);
}
dma = dma_map_single(dev, raw_packet,
I40E_FDIR_MAX_RAW_PACKET_SIZE, DMA_TO_DEVICE);
if (dma_mapping_error(dev, dma))
goto dma_fail;
/* grab the next descriptor */
i = tx_ring->next_to_use;
first = &tx_ring->tx_bi[i];
i40e_fdir(tx_ring, fdir_data, add);
/* Now program a dummy descriptor */
i = tx_ring->next_to_use;
tx_desc = I40E_TX_DESC(tx_ring, i);
tx_buf = &tx_ring->tx_bi[i];
tx_ring->next_to_use = ((i + 1) < tx_ring->count) ? i + 1 : 0;
memset(tx_buf, 0, sizeof(struct i40e_tx_buffer));
/* record length, and DMA address */
dma_unmap_len_set(tx_buf, len, I40E_FDIR_MAX_RAW_PACKET_SIZE);
dma_unmap_addr_set(tx_buf, dma, dma);
tx_desc->buffer_addr = cpu_to_le64(dma);
td_cmd = I40E_TXD_CMD | I40E_TX_DESC_CMD_DUMMY;
tx_buf->tx_flags = I40E_TX_FLAGS_FD_SB;
tx_buf->raw_buf = (void *)raw_packet;
tx_desc->cmd_type_offset_bsz =
build_ctob(td_cmd, 0, I40E_FDIR_MAX_RAW_PACKET_SIZE, 0);
/* Force memory writes to complete before letting h/w
* know there are new descriptors to fetch.
*/
wmb();
/* Mark the data descriptor to be watched */
first->next_to_watch = tx_desc;
writel(tx_ring->next_to_use, tx_ring->tail);
return 0;
dma_fail:
return -1;
}
/**
* i40e_create_dummy_packet - Constructs dummy packet for HW
* @dummy_packet: preallocated space for dummy packet
* @ipv4: is layer 3 packet of version 4 or 6
* @l4proto: next level protocol used in data portion of l3
* @data: filter data
*
* Returns address of layer 4 protocol dummy packet.
**/
static char *i40e_create_dummy_packet(u8 *dummy_packet, bool ipv4, u8 l4proto,
struct i40e_fdir_filter *data)
{
bool is_vlan = !!data->vlan_tag;
struct vlan_hdr vlan;
struct ipv6hdr ipv6;
struct ethhdr eth;
struct iphdr ip;
u8 *tmp;
if (ipv4) {
eth.h_proto = cpu_to_be16(ETH_P_IP);
ip.protocol = l4proto;
ip.version = 0x4;
ip.ihl = 0x5;
ip.daddr = data->dst_ip;
ip.saddr = data->src_ip;
} else {
eth.h_proto = cpu_to_be16(ETH_P_IPV6);
ipv6.nexthdr = l4proto;
ipv6.version = 0x6;
memcpy(&ipv6.saddr.in6_u.u6_addr32, data->src_ip6,
sizeof(__be32) * 4);
memcpy(&ipv6.daddr.in6_u.u6_addr32, data->dst_ip6,
sizeof(__be32) * 4);
}
if (is_vlan) {
vlan.h_vlan_TCI = data->vlan_tag;
vlan.h_vlan_encapsulated_proto = eth.h_proto;
eth.h_proto = data->vlan_etype;
}
tmp = dummy_packet;
memcpy(tmp, ð, sizeof(eth));
tmp += sizeof(eth);
if (is_vlan) {
memcpy(tmp, &vlan, sizeof(vlan));
tmp += sizeof(vlan);
}
if (ipv4) {
memcpy(tmp, &ip, sizeof(ip));
tmp += sizeof(ip);
} else {
memcpy(tmp, &ipv6, sizeof(ipv6));
tmp += sizeof(ipv6);
}
return tmp;
}
/**
* i40e_create_dummy_udp_packet - helper function to create UDP packet
* @raw_packet: preallocated space for dummy packet
* @ipv4: is layer 3 packet of version 4 or 6
* @l4proto: next level protocol used in data portion of l3
* @data: filter data
*
* Helper function to populate udp fields.
**/
static void i40e_create_dummy_udp_packet(u8 *raw_packet, bool ipv4, u8 l4proto,
struct i40e_fdir_filter *data)
{
struct udphdr *udp;
u8 *tmp;
tmp = i40e_create_dummy_packet(raw_packet, ipv4, IPPROTO_UDP, data);
udp = (struct udphdr *)(tmp);
udp->dest = data->dst_port;
udp->source = data->src_port;
}
/**
* i40e_create_dummy_tcp_packet - helper function to create TCP packet
* @raw_packet: preallocated space for dummy packet
* @ipv4: is layer 3 packet of version 4 or 6
* @l4proto: next level protocol used in data portion of l3
* @data: filter data
*
* Helper function to populate tcp fields.
**/
static void i40e_create_dummy_tcp_packet(u8 *raw_packet, bool ipv4, u8 l4proto,
struct i40e_fdir_filter *data)
{
struct tcphdr *tcp;
u8 *tmp;
/* Dummy tcp packet */
static const char tcp_packet[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0x50, 0x11, 0x0, 0x72, 0, 0, 0, 0};
tmp = i40e_create_dummy_packet(raw_packet, ipv4, IPPROTO_TCP, data);
tcp = (struct tcphdr *)tmp;
memcpy(tcp, tcp_packet, sizeof(tcp_packet));
tcp->dest = data->dst_port;
tcp->source = data->src_port;
}
/**
* i40e_create_dummy_sctp_packet - helper function to create SCTP packet
* @raw_packet: preallocated space for dummy packet
* @ipv4: is layer 3 packet of version 4 or 6
* @l4proto: next level protocol used in data portion of l3
* @data: filter data
*
* Helper function to populate sctp fields.
**/
static void i40e_create_dummy_sctp_packet(u8 *raw_packet, bool ipv4,
u8 l4proto,
struct i40e_fdir_filter *data)
{
struct sctphdr *sctp;
u8 *tmp;
tmp = i40e_create_dummy_packet(raw_packet, ipv4, IPPROTO_SCTP, data);
sctp = (struct sctphdr *)tmp;
sctp->dest = data->dst_port;
sctp->source = data->src_port;
}
/**
* i40e_prepare_fdir_filter - Prepare and program fdir filter
* @pf: physical function to attach filter to
* @fd_data: filter data
* @add: add or delete filter
* @packet_addr: address of dummy packet, used in filtering
* @payload_offset: offset from dummy packet address to user defined data
* @pctype: Packet type for which filter is used
*
* Helper function to offset data of dummy packet, program it and
* handle errors.
**/
static int i40e_prepare_fdir_filter(struct i40e_pf *pf,
struct i40e_fdir_filter *fd_data,
bool add, char *packet_addr,
int payload_offset, u8 pctype)
{
int ret;
if (fd_data->flex_filter) {
u8 *payload;
__be16 pattern = fd_data->flex_word;
u16 off = fd_data->flex_offset;
payload = packet_addr + payload_offset;
/* If user provided vlan, offset payload by vlan header length */
if (!!fd_data->vlan_tag)
payload += VLAN_HLEN;
*((__force __be16 *)(payload + off)) = pattern;
}
fd_data->pctype = pctype;
ret = i40e_program_fdir_filter(fd_data, packet_addr, pf, add);
if (ret) {
dev_info(&pf->pdev->dev,
"PCTYPE:%d, Filter command send failed for fd_id:%d (ret = %d)\n",
fd_data->pctype, fd_data->fd_id, ret);
/* Free the packet buffer since it wasn't added to the ring */
return -EOPNOTSUPP;
} else if (I40E_DEBUG_FD & pf->hw.debug_mask) {
if (add)
dev_info(&pf->pdev->dev,
"Filter OK for PCTYPE %d loc = %d\n",
fd_data->pctype, fd_data->fd_id);
else
dev_info(&pf->pdev->dev,
"Filter deleted for PCTYPE %d loc = %d\n",
fd_data->pctype, fd_data->fd_id);
}
return ret;
}
/**
* i40e_change_filter_num - Prepare and program fdir filter
* @ipv4: is layer 3 packet of version 4 or 6
* @add: add or delete filter
* @ipv4_filter_num: field to update
* @ipv6_filter_num: field to update
*
* Update filter number field for pf.
**/
static void i40e_change_filter_num(bool ipv4, bool add, u16 *ipv4_filter_num,
u16 *ipv6_filter_num)
{
if (add) {
if (ipv4)
(*ipv4_filter_num)++;
else
(*ipv6_filter_num)++;
} else {
if (ipv4)
(*ipv4_filter_num)--;
else
(*ipv6_filter_num)--;
}
}
#define I40E_UDPIP_DUMMY_PACKET_LEN 42
#define I40E_UDPIP6_DUMMY_PACKET_LEN 62
/**
* i40e_add_del_fdir_udp - Add/Remove UDP filters
* @vsi: pointer to the targeted VSI
* @fd_data: the flow director data required for the FDir descriptor
* @add: true adds a filter, false removes it
* @ipv4: true is v4, false is v6
*
* Returns 0 if the filters were successfully added or removed
**/
static int i40e_add_del_fdir_udp(struct i40e_vsi *vsi,
struct i40e_fdir_filter *fd_data,
bool add,
bool ipv4)
{
struct i40e_pf *pf = vsi->back;
u8 *raw_packet;
int ret;
raw_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_SIZE, GFP_KERNEL);
if (!raw_packet)
return -ENOMEM;
i40e_create_dummy_udp_packet(raw_packet, ipv4, IPPROTO_UDP, fd_data);
if (ipv4)
ret = i40e_prepare_fdir_filter
(pf, fd_data, add, raw_packet,
I40E_UDPIP_DUMMY_PACKET_LEN,
I40E_FILTER_PCTYPE_NONF_IPV4_UDP);
else
ret = i40e_prepare_fdir_filter
(pf, fd_data, add, raw_packet,
I40E_UDPIP6_DUMMY_PACKET_LEN,
I40E_FILTER_PCTYPE_NONF_IPV6_UDP);
if (ret) {
kfree(raw_packet);
return ret;
}
i40e_change_filter_num(ipv4, add, &pf->fd_udp4_filter_cnt,
&pf->fd_udp6_filter_cnt);
return 0;
}
#define I40E_TCPIP_DUMMY_PACKET_LEN 54
#define I40E_TCPIP6_DUMMY_PACKET_LEN 74
/**
* i40e_add_del_fdir_tcp - Add/Remove TCPv4 filters
* @vsi: pointer to the targeted VSI
* @fd_data: the flow director data required for the FDir descriptor
* @add: true adds a filter, false removes it
* @ipv4: true is v4, false is v6
*
* Returns 0 if the filters were successfully added or removed
**/
static int i40e_add_del_fdir_tcp(struct i40e_vsi *vsi,
struct i40e_fdir_filter *fd_data,
bool add,
bool ipv4)
{
struct i40e_pf *pf = vsi->back;
u8 *raw_packet;
int ret;
raw_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_SIZE, GFP_KERNEL);
if (!raw_packet)
return -ENOMEM;
i40e_create_dummy_tcp_packet(raw_packet, ipv4, IPPROTO_TCP, fd_data);
if (ipv4)
ret = i40e_prepare_fdir_filter
(pf, fd_data, add, raw_packet,
I40E_TCPIP_DUMMY_PACKET_LEN,
I40E_FILTER_PCTYPE_NONF_IPV4_TCP);
else
ret = i40e_prepare_fdir_filter
(pf, fd_data, add, raw_packet,
I40E_TCPIP6_DUMMY_PACKET_LEN,
I40E_FILTER_PCTYPE_NONF_IPV6_TCP);
if (ret) {
kfree(raw_packet);
return ret;
}
i40e_change_filter_num(ipv4, add, &pf->fd_tcp4_filter_cnt,
&pf->fd_tcp6_filter_cnt);
if (add) {
if ((pf->flags & I40E_FLAG_FD_ATR_ENABLED) &&
I40E_DEBUG_FD & pf->hw.debug_mask)
dev_info(&pf->pdev->dev, "Forcing ATR off, sideband rules for TCP/IPv4 flow being applied\n");
set_bit(__I40E_FD_ATR_AUTO_DISABLED, pf->state);
}
return 0;
}
#define I40E_SCTPIP_DUMMY_PACKET_LEN 46
#define I40E_SCTPIP6_DUMMY_PACKET_LEN 66
/**
* i40e_add_del_fdir_sctp - Add/Remove SCTPv4 Flow Director filters for
* a specific flow spec
* @vsi: pointer to the targeted VSI
* @fd_data: the flow director data required for the FDir descriptor
* @add: true adds a filter, false removes it
* @ipv4: true is v4, false is v6
*
* Returns 0 if the filters were successfully added or removed
**/
static int i40e_add_del_fdir_sctp(struct i40e_vsi *vsi,
struct i40e_fdir_filter *fd_data,
bool add,
bool ipv4)
{
struct i40e_pf *pf = vsi->back;
u8 *raw_packet;
int ret;
raw_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_SIZE, GFP_KERNEL);
if (!raw_packet)
return -ENOMEM;
i40e_create_dummy_sctp_packet(raw_packet, ipv4, IPPROTO_SCTP, fd_data);
if (ipv4)
ret = i40e_prepare_fdir_filter
(pf, fd_data, add, raw_packet,
I40E_SCTPIP_DUMMY_PACKET_LEN,
I40E_FILTER_PCTYPE_NONF_IPV4_SCTP);
else
ret = i40e_prepare_fdir_filter
(pf, fd_data, add, raw_packet,
I40E_SCTPIP6_DUMMY_PACKET_LEN,
I40E_FILTER_PCTYPE_NONF_IPV6_SCTP);
if (ret) {
kfree(raw_packet);
return ret;
}
i40e_change_filter_num(ipv4, add, &pf->fd_sctp4_filter_cnt,
&pf->fd_sctp6_filter_cnt);
return 0;
}
#define I40E_IP_DUMMY_PACKET_LEN 34
#define I40E_IP6_DUMMY_PACKET_LEN 54
/**
* i40e_add_del_fdir_ip - Add/Remove IPv4 Flow Director filters for
* a specific flow spec
* @vsi: pointer to the targeted VSI
* @fd_data: the flow director data required for the FDir descriptor
* @add: true adds a filter, false removes it
* @ipv4: true is v4, false is v6
*
* Returns 0 if the filters were successfully added or removed
**/
static int i40e_add_del_fdir_ip(struct i40e_vsi *vsi,
struct i40e_fdir_filter *fd_data,
bool add,
bool ipv4)
{
struct i40e_pf *pf = vsi->back;
int payload_offset;
u8 *raw_packet;
int iter_start;
int iter_end;
int ret;
int i;
if (ipv4) {
iter_start = I40E_FILTER_PCTYPE_NONF_IPV4_OTHER;
iter_end = I40E_FILTER_PCTYPE_FRAG_IPV4;
} else {
iter_start = I40E_FILTER_PCTYPE_NONF_IPV6_OTHER;
iter_end = I40E_FILTER_PCTYPE_FRAG_IPV6;
}
for (i = iter_start; i <= iter_end; i++) {
raw_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_SIZE, GFP_KERNEL);
if (!raw_packet)
return -ENOMEM;
/* IPv6 no header option differs from IPv4 */
(void)i40e_create_dummy_packet
(raw_packet, ipv4, (ipv4) ? IPPROTO_IP : IPPROTO_NONE,
fd_data);
payload_offset = (ipv4) ? I40E_IP_DUMMY_PACKET_LEN :
I40E_IP6_DUMMY_PACKET_LEN;
ret = i40e_prepare_fdir_filter(pf, fd_data, add, raw_packet,
payload_offset, i);
if (ret)
goto err;
}
i40e_change_filter_num(ipv4, add, &pf->fd_ip4_filter_cnt,
&pf->fd_ip6_filter_cnt);
return 0;
err:
kfree(raw_packet);
return ret;
}
/**
* i40e_add_del_fdir - Build raw packets to add/del fdir filter
* @vsi: pointer to the targeted VSI
* @input: filter to add or delete
* @add: true adds a filter, false removes it
*
**/
int i40e_add_del_fdir(struct i40e_vsi *vsi,
struct i40e_fdir_filter *input, bool add)
{
enum ip_ver { ipv6 = 0, ipv4 = 1 };
struct i40e_pf *pf = vsi->back;
int ret;
switch (input->flow_type & ~FLOW_EXT) {
case TCP_V4_FLOW:
ret = i40e_add_del_fdir_tcp(vsi, input, add, ipv4);
break;
case UDP_V4_FLOW:
ret = i40e_add_del_fdir_udp(vsi, input, add, ipv4);
break;
case SCTP_V4_FLOW:
ret = i40e_add_del_fdir_sctp(vsi, input, add, ipv4);
break;
case TCP_V6_FLOW:
ret = i40e_add_del_fdir_tcp(vsi, input, add, ipv6);
break;
case UDP_V6_FLOW:
ret = i40e_add_del_fdir_udp(vsi, input, add, ipv6);
break;
case SCTP_V6_FLOW:
ret = i40e_add_del_fdir_sctp(vsi, input, add, ipv6);
break;
case IP_USER_FLOW:
switch (input->ipl4_proto) {
case IPPROTO_TCP:
ret = i40e_add_del_fdir_tcp(vsi, input, add, ipv4);
break;
case IPPROTO_UDP:
ret = i40e_add_del_fdir_udp(vsi, input, add, ipv4);
break;
case IPPROTO_SCTP:
ret = i40e_add_del_fdir_sctp(vsi, input, add, ipv4);
break;
case IPPROTO_IP:
ret = i40e_add_del_fdir_ip(vsi, input, add, ipv4);
break;
default:
/* We cannot support masking based on protocol */
dev_info(&pf->pdev->dev, "Unsupported IPv4 protocol 0x%02x\n",
input->ipl4_proto);
return -EINVAL;
}
break;
case IPV6_USER_FLOW:
switch (input->ipl4_proto) {
case IPPROTO_TCP:
ret = i40e_add_del_fdir_tcp(vsi, input, add, ipv6);
break;
case IPPROTO_UDP:
ret = i40e_add_del_fdir_udp(vsi, input, add, ipv6);
break;
case IPPROTO_SCTP:
ret = i40e_add_del_fdir_sctp(vsi, input, add, ipv6);
break;
case IPPROTO_IP:
ret = i40e_add_del_fdir_ip(vsi, input, add, ipv6);
break;
default:
/* We cannot support masking based on protocol */
dev_info(&pf->pdev->dev, "Unsupported IPv6 protocol 0x%02x\n",
input->ipl4_proto);
return -EINVAL;
}
break;
default:
dev_info(&pf->pdev->dev, "Unsupported flow type 0x%02x\n",
input->flow_type);
return -EINVAL;
}
/* The buffer allocated here will be normally be freed by
* i40e_clean_fdir_tx_irq() as it reclaims resources after transmit
* completion. In the event of an error adding the buffer to the FDIR
* ring, it will immediately be freed. It may also be freed by
* i40e_clean_tx_ring() when closing the VSI.
*/
return ret;
}
/**
* i40e_fd_handle_status - check the Programming Status for FD
* @rx_ring: the Rx ring for this descriptor
* @qword0_raw: qword0
* @qword1: qword1 after le_to_cpu
* @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, u64 qword0_raw,
u64 qword1, u8 prog_id)
{
struct i40e_pf *pf = rx_ring->vsi->back;
struct pci_dev *pdev = pf->pdev;
struct i40e_16b_rx_wb_qw0 *qw0;
u32 fcnt_prog, fcnt_avail;
u32 error;
qw0 = (struct i40e_16b_rx_wb_qw0 *)&qword0_raw;
error = (qword1 & I40E_RX_PROG_STATUS_DESC_QW1_ERROR_MASK) >>
I40E_RX_PROG_STATUS_DESC_QW1_ERROR_SHIFT;
if (error == BIT(I40E_RX_PROG_STATUS_DESC_FD_TBL_FULL_SHIFT)) {
pf->fd_inv = le32_to_cpu(qw0->hi_dword.fd_id);
if (qw0->hi_dword.fd_id != 0 ||
(I40E_DEBUG_FD & pf->hw.debug_mask))
dev_warn(&pdev->dev, "ntuple filter loc = %d, could not be added\n",
pf->fd_inv);
/* Check if the programming error is for ATR.
* If so, auto disable ATR and set a state for
* flush in progress. Next time we come here if flush is in
* progress do nothing, once flush is complete the state will
* be cleared.
*/
if (test_bit(__I40E_FD_FLUSH_REQUESTED, pf->state))
return;
pf->fd_add_err++;
/* store the current atr filter count */
pf->fd_atr_cnt = i40e_get_current_atr_cnt(pf);
if (qw0->hi_dword.fd_id == 0 &&
test_bit(__I40E_FD_SB_AUTO_DISABLED, pf->state)) {
/* These set_bit() calls aren't atomic with the
* test_bit() here, but worse case we potentially
* disable ATR and queue a flush right after SB
* support is re-enabled. That shouldn't cause an
* issue in practice
*/
set_bit(__I40E_FD_ATR_AUTO_DISABLED, pf->state);
set_bit(__I40E_FD_FLUSH_REQUESTED, pf->state);
}
/* filter programming failed most likely due to table full */
fcnt_prog = i40e_get_global_fd_count(pf);
fcnt_avail = 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)) {
if ((pf->flags & I40E_FLAG_FD_SB_ENABLED) &&
!test_and_set_bit(__I40E_FD_SB_AUTO_DISABLED,
pf->state))
if (I40E_DEBUG_FD & pf->hw.debug_mask)
dev_warn(&pdev->dev, "FD filter space full, new ntuple rules will not be added\n");
}
} else if (error == BIT(I40E_RX_PROG_STATUS_DESC_NO_FD_ENTRY_SHIFT)) {
if (I40E_DEBUG_FD & pf->hw.debug_mask)
dev_info(&pdev->dev, "ntuple filter fd_id = %d, could not be removed\n",
qw0->hi_dword.fd_id);
}
}
/**
* i40e_unmap_and_free_tx_resource - Release a Tx buffer
* @ring: the ring that owns the buffer
* @tx_buffer: the buffer to free
**/
static void i40e_unmap_and_free_tx_resource(struct i40e_ring *ring,
struct i40e_tx_buffer *tx_buffer)
{
if (tx_buffer->skb) {
if (tx_buffer->tx_flags & I40E_TX_FLAGS_FD_SB)
kfree(tx_buffer->raw_buf);
else if (ring_is_xdp(ring))
xdp_return_frame(tx_buffer->xdpf);
else
dev_kfree_skb_any(tx_buffer->skb);
if (dma_unmap_len(tx_buffer, len))
dma_unmap_single(ring->dev,
dma_unmap_addr(tx_buffer, dma),
dma_unmap_len(tx_buffer, len),
DMA_TO_DEVICE);
} else if (dma_unmap_len(tx_buffer, len)) {
dma_unmap_page(ring->dev,
dma_unmap_addr(tx_buffer, dma),
dma_unmap_len(tx_buffer, len),
DMA_TO_DEVICE);
}
tx_buffer->next_to_watch = NULL;
tx_buffer->skb = NULL;
dma_unmap_len_set(tx_buffer, len, 0);
/* tx_buffer must be completely set up in the transmit path */
}
/**
* i40e_clean_tx_ring - Free any empty Tx buffers
* @tx_ring: ring to be cleaned
**/
void i40e_clean_tx_ring(struct i40e_ring *tx_ring)
{
unsigned long bi_size;
u16 i;
if (ring_is_xdp(tx_ring) && tx_ring->xsk_pool) {
i40e_xsk_clean_tx_ring(tx_ring);
} else {
/* ring already cleared, nothing to do */
if (!tx_ring->tx_bi)
return;
/* Free all the Tx ring sk_buffs */
for (i = 0; i < tx_ring->count; i++)
i40e_unmap_and_free_tx_resource(tx_ring,
&tx_ring->tx_bi[i]);
}
bi_size = sizeof(struct i40e_tx_buffer) * tx_ring->count;
memset(tx_ring->tx_bi, 0, bi_size);
/* Zero out the descriptor ring */
memset(tx_ring->desc, 0, tx_ring->size);
tx_ring->next_to_use = 0;
tx_ring->next_to_clean = 0;
if (!tx_ring->netdev)
return;
/* cleanup Tx queue statistics */
netdev_tx_reset_queue(txring_txq(tx_ring));
}
/**
* i40e_free_tx_resources - Free Tx resources per queue
* @tx_ring: Tx descriptor ring for a specific queue
*
* Free all transmit software resources
**/
void i40e_free_tx_resources(struct i40e_ring *tx_ring)
{
i40e_clean_tx_ring(tx_ring);
kfree(tx_ring->tx_bi);
tx_ring->tx_bi = NULL;
if (tx_ring->desc) {
dma_free_coherent(tx_ring->dev, tx_ring->size,
tx_ring->desc, tx_ring->dma);
tx_ring->desc = NULL;
}
}
/**
* i40e_get_tx_pending - how many tx descriptors not processed
* @ring: the ring of descriptors
* @in_sw: use SW variables
*
* Since there is no access to the ring head register
* in XL710, we need to use our local copies
**/
u32 i40e_get_tx_pending(struct i40e_ring *ring, bool in_sw)
{
u32 head, tail;
if (!in_sw) {
head = i40e_get_head(ring);
tail = readl(ring->tail);
} else {
head = ring->next_to_clean;
tail = ring->next_to_use;
}
if (head != tail)
return (head < tail) ?
tail - head : (tail + ring->count - head);
return 0;
}
/**
* i40e_detect_recover_hung - Function to detect and recover hung_queues
* @vsi: pointer to vsi struct with tx queues
*
* VSI has netdev and netdev has TX queues. This function is to check each of
* those TX queues if they are hung, trigger recovery by issuing SW interrupt.
**/
void i40e_detect_recover_hung(struct i40e_vsi *vsi)
{
struct i40e_ring *tx_ring = NULL;
struct net_device *netdev;
unsigned int i;
int packets;
if (!vsi)
return;
if (test_bit(__I40E_VSI_DOWN, vsi->state))
return;
netdev = vsi->netdev;
if (!netdev)
return;
if (!netif_carrier_ok(netdev))
return;
for (i = 0; i < vsi->num_queue_pairs; i++) {
tx_ring = vsi->tx_rings[i];
if (tx_ring && tx_ring->desc) {
/* If packet counter has not changed the queue is
* likely stalled, so force an interrupt for this
* queue.
*
* prev_pkt_ctr would be negative if there was no
* pending work.
*/
packets = tx_ring->stats.packets & INT_MAX;
if (tx_ring->tx_stats.prev_pkt_ctr == packets) {
i40e_force_wb(vsi, tx_ring->q_vector);
continue;
}
/* Memory barrier between read of packet count and call
* to i40e_get_tx_pending()
*/
smp_rmb();
tx_ring->tx_stats.prev_pkt_ctr =
i40e_get_tx_pending(tx_ring, true) ? packets : -1;
}
}
}
/**
* i40e_clean_tx_irq - Reclaim resources after transmit completes
* @vsi: the VSI we care about
* @tx_ring: Tx ring to clean
* @napi_budget: Used to determine if we are in netpoll
*
* Returns true if there's any budget left (e.g. the clean is finished)
**/
static bool i40e_clean_tx_irq(struct i40e_vsi *vsi,
struct i40e_ring *tx_ring, int napi_budget)
{
int i = tx_ring->next_to_clean;
struct i40e_tx_buffer *tx_buf;
struct i40e_tx_desc *tx_head;
struct i40e_tx_desc *tx_desc;
unsigned int total_bytes = 0, total_packets = 0;
unsigned int budget = vsi->work_limit;
tx_buf = &tx_ring->tx_bi[i];
tx_desc = I40E_TX_DESC(tx_ring, i);
i -= tx_ring->count;
tx_head = I40E_TX_DESC(tx_ring, i40e_get_head(tx_ring));
do {
struct i40e_tx_desc *eop_desc = tx_buf->next_to_watch;
/* if next_to_watch is not set then there is no work pending */
if (!eop_desc)
break;
/* prevent any other reads prior to eop_desc */
smp_rmb();
i40e_trace(clean_tx_irq, tx_ring, tx_desc, tx_buf);
/* we have caught up to head, no work left to do */
if (tx_head == tx_desc)
break;
/* clear next_to_watch to prevent false hangs */
tx_buf->next_to_watch = NULL;
/* update the statistics for this packet */
total_bytes += tx_buf->bytecount;
total_packets += tx_buf->gso_segs;
/* free the skb/XDP data */
if (ring_is_xdp(tx_ring))
xdp_return_frame(tx_buf->xdpf);
else
napi_consume_skb(tx_buf->skb, napi_budget);
/* unmap skb header data */
dma_unmap_single(tx_ring->dev,
dma_unmap_addr(tx_buf, dma),
dma_unmap_len(tx_buf, len),
DMA_TO_DEVICE);
/* clear tx_buffer data */
tx_buf->skb = NULL;
dma_unmap_len_set(tx_buf, len, 0);
/* unmap remaining buffers */
while (tx_desc != eop_desc) {
i40e_trace(clean_tx_irq_unmap,
tx_ring, tx_desc, tx_buf);
tx_buf++;
tx_desc++;
i++;
if (unlikely(!i)) {
i -= tx_ring->count;
tx_buf = tx_ring->tx_bi;
tx_desc = I40E_TX_DESC(tx_ring, 0);
}
/* unmap any remaining paged data */
if (dma_unmap_len(tx_buf, len)) {
dma_unmap_page(tx_ring->dev,
dma_unmap_addr(tx_buf, dma),