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linux/drivers/net/ethernet/intel/i40e/i40e_txrx.c
Jesse Brandeburg 1f15d66712 i40e/i40evf: Faster RX via avoiding FCoE 
As it turns out, calling into other files from hot path hurts
performance a lot.  In this case the majority of the time we
call "check FCoE" and the packet is *not* FCoE, but this call
was taking 5% of our total cycles spent on receive.

Change-ID: I080552c26e7060bc7b78504dc2763f6f0b3d8c76
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
2016-04-06 18:26:23 -07:00

3000 lines
82 KiB
C
Raw Blame History

/*******************************************************************************
*
* Intel Ethernet Controller XL710 Family Linux Driver
* Copyright(c) 2013 - 2016 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 <linux/prefetch.h>
#include <net/busy_poll.h>
#include "i40e.h"
#include "i40e_prototype.h"
static inline __le64 build_ctob(u32 td_cmd, u32 td_offset, unsigned int size,
u32 td_tag)
{
return cpu_to_le64(I40E_TX_DESC_DTYPE_DATA |
((u64)td_cmd << I40E_TXD_QW1_CMD_SHIFT) |
((u64)td_offset << I40E_TXD_QW1_OFFSET_SHIFT) |
((u64)size << I40E_TXD_QW1_TX_BUF_SZ_SHIFT) |
((u64)td_tag << I40E_TXD_QW1_L2TAG1_SHIFT));
}
#define I40E_TXD_CMD (I40E_TX_DESC_CMD_EOP | I40E_TX_DESC_CMD_RS)
#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
**/
int i40e_program_fdir_filter(struct i40e_fdir_filter *fdir_data, u8 *raw_packet,
struct i40e_pf *pf, bool add)
{
struct i40e_filter_program_desc *fdir_desc;
struct i40e_tx_buffer *tx_buf, *first;
struct i40e_tx_desc *tx_desc;
struct i40e_ring *tx_ring;
unsigned int fpt, dcc;
struct i40e_vsi *vsi;
struct device *dev;
dma_addr_t dma;
u32 td_cmd = 0;
u16 delay = 0;
u16 i;
/* find existing FDIR VSI */
vsi = NULL;
for (i = 0; i < pf->num_alloc_vsi; i++)
if (pf->vsi[i] && pf->vsi[i]->type == I40E_VSI_FDIR)
vsi = pf->vsi[i];
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 */
do {
if (I40E_DESC_UNUSED(tx_ring) > 1)
break;
msleep_interruptible(1);
delay++;
} while (delay < I40E_FD_CLEAN_DELAY);
if (!(I40E_DESC_UNUSED(tx_ring) > 1))
return -EAGAIN;
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;
fdir_desc = I40E_TX_FDIRDESC(tx_ring, i);
first = &tx_ring->tx_bi[i];
memset(first, 0, sizeof(struct i40e_tx_buffer));
tx_ring->next_to_use = ((i + 1) < tx_ring->count) ? i + 1 : 0;
fpt = (fdir_data->q_index << I40E_TXD_FLTR_QW0_QINDEX_SHIFT) &
I40E_TXD_FLTR_QW0_QINDEX_MASK;
fpt |= (fdir_data->flex_off << I40E_TXD_FLTR_QW0_FLEXOFF_SHIFT) &
I40E_TXD_FLTR_QW0_FLEXOFF_MASK;
fpt |= (fdir_data->pctype << I40E_TXD_FLTR_QW0_PCTYPE_SHIFT) &
I40E_TXD_FLTR_QW0_PCTYPE_MASK;
/* Use LAN VSI Id if not programmed by user */
if (fdir_data->dest_vsi == 0)
fpt |= (pf->vsi[pf->lan_vsi]->id) <<
I40E_TXD_FLTR_QW0_DEST_VSI_SHIFT;
else
fpt |= ((u32)fdir_data->dest_vsi <<
I40E_TXD_FLTR_QW0_DEST_VSI_SHIFT) &
I40E_TXD_FLTR_QW0_DEST_VSI_MASK;
dcc = I40E_TX_DESC_DTYPE_FILTER_PROG;
if (add)
dcc |= I40E_FILTER_PROGRAM_DESC_PCMD_ADD_UPDATE <<
I40E_TXD_FLTR_QW1_PCMD_SHIFT;
else
dcc |= I40E_FILTER_PROGRAM_DESC_PCMD_REMOVE <<
I40E_TXD_FLTR_QW1_PCMD_SHIFT;
dcc |= (fdir_data->dest_ctl << I40E_TXD_FLTR_QW1_DEST_SHIFT) &
I40E_TXD_FLTR_QW1_DEST_MASK;
dcc |= (fdir_data->fd_status << I40E_TXD_FLTR_QW1_FD_STATUS_SHIFT) &
I40E_TXD_FLTR_QW1_FD_STATUS_MASK;
if (fdir_data->cnt_index != 0) {
dcc |= I40E_TXD_FLTR_QW1_CNT_ENA_MASK;
dcc |= ((u32)fdir_data->cnt_index <<
I40E_TXD_FLTR_QW1_CNTINDEX_SHIFT) &
I40E_TXD_FLTR_QW1_CNTINDEX_MASK;
}
fdir_desc->qindex_flex_ptype_vsi = cpu_to_le32(fpt);
fdir_desc->rsvd = cpu_to_le32(0);
fdir_desc->dtype_cmd_cntindex = cpu_to_le32(dcc);
fdir_desc->fd_id = cpu_to_le32(fdir_data->fd_id);
/* 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;
}
#define IP_HEADER_OFFSET 14
#define I40E_UDPIP_DUMMY_PACKET_LEN 42
/**
* i40e_add_del_fdir_udpv4 - Add/Remove UDPv4 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
*
* Returns 0 if the filters were successfully added or removed
**/
static int i40e_add_del_fdir_udpv4(struct i40e_vsi *vsi,
struct i40e_fdir_filter *fd_data,
bool add)
{
struct i40e_pf *pf = vsi->back;
struct udphdr *udp;
struct iphdr *ip;
bool err = false;
u8 *raw_packet;
int ret;
static char packet[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0,
0x45, 0, 0, 0x1c, 0, 0, 0x40, 0, 0x40, 0x11, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
raw_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_SIZE, GFP_KERNEL);
if (!raw_packet)
return -ENOMEM;
memcpy(raw_packet, packet, I40E_UDPIP_DUMMY_PACKET_LEN);
ip = (struct iphdr *)(raw_packet + IP_HEADER_OFFSET);
udp = (struct udphdr *)(raw_packet + IP_HEADER_OFFSET
+ sizeof(struct iphdr));
ip->daddr = fd_data->dst_ip[0];
udp->dest = fd_data->dst_port;
ip->saddr = fd_data->src_ip[0];
udp->source = fd_data->src_port;
fd_data->pctype = I40E_FILTER_PCTYPE_NONF_IPV4_UDP;
ret = i40e_program_fdir_filter(fd_data, raw_packet, 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);
err = true;
} 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);
}
if (err)
kfree(raw_packet);
return err ? -EOPNOTSUPP : 0;
}
#define I40E_TCPIP_DUMMY_PACKET_LEN 54
/**
* i40e_add_del_fdir_tcpv4 - 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
*
* Returns 0 if the filters were successfully added or removed
**/
static int i40e_add_del_fdir_tcpv4(struct i40e_vsi *vsi,
struct i40e_fdir_filter *fd_data,
bool add)
{
struct i40e_pf *pf = vsi->back;
struct tcphdr *tcp;
struct iphdr *ip;
bool err = false;
u8 *raw_packet;
int ret;
/* Dummy packet */
static char packet[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0,
0x45, 0, 0, 0x28, 0, 0, 0x40, 0, 0x40, 0x6, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x80, 0x11,
0x0, 0x72, 0, 0, 0, 0};
raw_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_SIZE, GFP_KERNEL);
if (!raw_packet)
return -ENOMEM;
memcpy(raw_packet, packet, I40E_TCPIP_DUMMY_PACKET_LEN);
ip = (struct iphdr *)(raw_packet + IP_HEADER_OFFSET);
tcp = (struct tcphdr *)(raw_packet + IP_HEADER_OFFSET
+ sizeof(struct iphdr));
ip->daddr = fd_data->dst_ip[0];
tcp->dest = fd_data->dst_port;
ip->saddr = fd_data->src_ip[0];
tcp->source = fd_data->src_port;
if (add) {
pf->fd_tcp_rule++;
if (pf->flags & I40E_FLAG_FD_ATR_ENABLED) {
if (I40E_DEBUG_FD & pf->hw.debug_mask)
dev_info(&pf->pdev->dev, "Forcing ATR off, sideband rules for TCP/IPv4 flow being applied\n");
pf->flags &= ~I40E_FLAG_FD_ATR_ENABLED;
}
} else {
pf->fd_tcp_rule = (pf->fd_tcp_rule > 0) ?
(pf->fd_tcp_rule - 1) : 0;
if (pf->fd_tcp_rule == 0) {
pf->flags |= I40E_FLAG_FD_ATR_ENABLED;
if (I40E_DEBUG_FD & pf->hw.debug_mask)
dev_info(&pf->pdev->dev, "ATR re-enabled due to no sideband TCP/IPv4 rules\n");
}
}
fd_data->pctype = I40E_FILTER_PCTYPE_NONF_IPV4_TCP;
ret = i40e_program_fdir_filter(fd_data, raw_packet, 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);
err = true;
} 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);
}
if (err)
kfree(raw_packet);
return err ? -EOPNOTSUPP : 0;
}
/**
* i40e_add_del_fdir_sctpv4 - 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
*
* Returns 0 if the filters were successfully added or removed
**/
static int i40e_add_del_fdir_sctpv4(struct i40e_vsi *vsi,
struct i40e_fdir_filter *fd_data,
bool add)
{
return -EOPNOTSUPP;
}
#define I40E_IP_DUMMY_PACKET_LEN 34
/**
* i40e_add_del_fdir_ipv4 - 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
*
* Returns 0 if the filters were successfully added or removed
**/
static int i40e_add_del_fdir_ipv4(struct i40e_vsi *vsi,
struct i40e_fdir_filter *fd_data,
bool add)
{
struct i40e_pf *pf = vsi->back;
struct iphdr *ip;
bool err = false;
u8 *raw_packet;
int ret;
int i;
static char packet[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0,
0x45, 0, 0, 0x14, 0, 0, 0x40, 0, 0x40, 0x10, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0};
for (i = I40E_FILTER_PCTYPE_NONF_IPV4_OTHER;
i <= I40E_FILTER_PCTYPE_FRAG_IPV4; i++) {
raw_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_SIZE, GFP_KERNEL);
if (!raw_packet)
return -ENOMEM;
memcpy(raw_packet, packet, I40E_IP_DUMMY_PACKET_LEN);
ip = (struct iphdr *)(raw_packet + IP_HEADER_OFFSET);
ip->saddr = fd_data->src_ip[0];
ip->daddr = fd_data->dst_ip[0];
ip->protocol = 0;
fd_data->pctype = i;
ret = i40e_program_fdir_filter(fd_data, raw_packet, 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);
err = true;
} 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);
}
}
if (err)
kfree(raw_packet);
return err ? -EOPNOTSUPP : 0;
}
/**
* i40e_add_del_fdir - Build raw packets to add/del fdir filter
* @vsi: pointer to the targeted VSI
* @cmd: command to get or set RX flow classification rules
* @add: true adds a filter, false removes it
*
**/
int i40e_add_del_fdir(struct i40e_vsi *vsi,
struct i40e_fdir_filter *input, bool add)
{
struct i40e_pf *pf = vsi->back;
int ret;
switch (input->flow_type & ~FLOW_EXT) {
case TCP_V4_FLOW:
ret = i40e_add_del_fdir_tcpv4(vsi, input, add);
break;
case UDP_V4_FLOW:
ret = i40e_add_del_fdir_udpv4(vsi, input, add);
break;
case SCTP_V4_FLOW:
ret = i40e_add_del_fdir_sctpv4(vsi, input, add);
break;
case IPV4_FLOW:
ret = i40e_add_del_fdir_ipv4(vsi, input, add);
break;
case IP_USER_FLOW:
switch (input->ip4_proto) {
case IPPROTO_TCP:
ret = i40e_add_del_fdir_tcpv4(vsi, input, add);
break;
case IPPROTO_UDP:
ret = i40e_add_del_fdir_udpv4(vsi, input, add);
break;
case IPPROTO_SCTP:
ret = i40e_add_del_fdir_sctpv4(vsi, input, add);
break;
default:
ret = i40e_add_del_fdir_ipv4(vsi, input, add);
break;
}
break;
default:
dev_info(&pf->pdev->dev, "Could not specify spec type %d\n",
input->flow_type);
ret = -EINVAL;
}
/* The buffer allocated here is freed by the i40e_clean_tx_ring() */
return ret;
}
/**
* i40e_fd_handle_status - check the Programming Status for FD
* @rx_ring: the Rx ring for this descriptor
* @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,
union i40e_rx_desc *rx_desc, u8 prog_id)
{
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;
if (error == BIT(I40E_RX_PROG_STATUS_DESC_FD_TBL_FULL_SHIFT)) {
pf->fd_inv = le32_to_cpu(rx_desc->wb.qword0.hi_dword.fd_id);
if ((rx_desc->wb.qword0.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 ((rx_desc->wb.qword0.hi_dword.fd_id == 0) &&
(pf->auto_disable_flags & I40E_FLAG_FD_SB_ENABLED)) {
pf->auto_disable_flags |= I40E_FLAG_FD_ATR_ENABLED;
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) &&
!(pf->auto_disable_flags &
I40E_FLAG_FD_SB_ENABLED)) {
if (I40E_DEBUG_FD & pf->hw.debug_mask)
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;
}
}
} 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",
rx_desc->wb.qword0.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) {
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);
}
if (tx_buffer->tx_flags & I40E_TX_FLAGS_FD_SB)
kfree(tx_buffer->raw_buf);
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;
/* 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(netdev_get_tx_queue(tx_ring->netdev,
tx_ring->queue_index));
}
/**
* 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
* @tx_ring: the ring of descriptors
* @in_sw: is tx_pending being checked in SW or HW
*
* 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);
else
head = ring->next_to_clean;
tail = readl(ring->tail);
if (head != tail)
return (head < tail) ?
tail - head : (tail + ring->count - head);
return 0;
}
#define WB_STRIDE 0x3
/**
* 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)
{
u16 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 */
read_barrier_depends();
/* 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 */
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) {
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),
dma_unmap_len(tx_buf, len),
DMA_TO_DEVICE);
dma_unmap_len_set(tx_buf, len, 0);
}
}
/* move us one more past the eop_desc for start of next pkt */
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);
}
prefetch(tx_desc);
/* update budget accounting */
budget--;
} while (likely(budget));
i += tx_ring->count;
tx_ring->next_to_clean = i;
u64_stats_update_begin(&tx_ring->syncp);
tx_ring->stats.bytes += total_bytes;
tx_ring->stats.packets += total_packets;
u64_stats_update_end(&tx_ring->syncp);
tx_ring->q_vector->tx.total_bytes += total_bytes;
tx_ring->q_vector->tx.total_packets += total_packets;
if (tx_ring->flags & I40E_TXR_FLAGS_WB_ON_ITR) {
unsigned int j = 0;
/* check to see if there are < 4 descriptors
* waiting to be written back, then kick the hardware to force
* them to be written back in case we stay in NAPI.
* In this mode on X722 we do not enable Interrupt.
*/
j = i40e_get_tx_pending(tx_ring, false);
if (budget &&
((j / (WB_STRIDE + 1)) == 0) && (j != 0) &&
!test_bit(__I40E_DOWN, &vsi->state) &&
(I40E_DESC_UNUSED(tx_ring) != tx_ring->count))
tx_ring->arm_wb = true;
}
netdev_tx_completed_queue(netdev_get_tx_queue(tx_ring->netdev,
tx_ring->queue_index),
total_packets, total_bytes);
#define TX_WAKE_THRESHOLD (DESC_NEEDED * 2)
if (unlikely(total_packets && netif_carrier_ok(tx_ring->netdev) &&
(I40E_DESC_UNUSED(tx_ring) >= TX_WAKE_THRESHOLD))) {
/* Make sure that anybody stopping the queue after this
* sees the new next_to_clean.
*/
smp_mb();
if (__netif_subqueue_stopped(tx_ring->netdev,
tx_ring->queue_index) &&
!test_bit(__I40E_DOWN, &vsi->state)) {
netif_wake_subqueue(tx_ring->netdev,
tx_ring->queue_index);
++tx_ring->tx_stats.restart_queue;
}
}
return !!budget;
}
/**
* i40e_enable_wb_on_itr - Arm hardware to do a wb, interrupts are not enabled
* @vsi: the VSI we care about
* @q_vector: the vector on which to enable writeback
*
**/
static void i40e_enable_wb_on_itr(struct i40e_vsi *vsi,
struct i40e_q_vector *q_vector)
{
u16 flags = q_vector->tx.ring[0].flags;
u32 val;
if (!(flags & I40E_TXR_FLAGS_WB_ON_ITR))
return;
if (q_vector->arm_wb_state)
return;
if (vsi->back->flags & I40E_FLAG_MSIX_ENABLED) {
val = I40E_PFINT_DYN_CTLN_WB_ON_ITR_MASK |
I40E_PFINT_DYN_CTLN_ITR_INDX_MASK; /* set noitr */
wr32(&vsi->back->hw,
I40E_PFINT_DYN_CTLN(q_vector->v_idx + vsi->base_vector - 1),
val);
} else {
val = I40E_PFINT_DYN_CTL0_WB_ON_ITR_MASK |
I40E_PFINT_DYN_CTL0_ITR_INDX_MASK; /* set noitr */
wr32(&vsi->back->hw, I40E_PFINT_DYN_CTL0, val);
}
q_vector->arm_wb_state = true;
}
/**
* i40e_force_wb - Issue SW Interrupt so HW does a wb
* @vsi: the VSI we care about
* @q_vector: the vector on which to force writeback
*
**/
void i40e_force_wb(struct i40e_vsi *vsi, struct i40e_q_vector *q_vector)
{
if (vsi->back->flags & I40E_FLAG_MSIX_ENABLED) {
u32 val = I40E_PFINT_DYN_CTLN_INTENA_MASK |
I40E_PFINT_DYN_CTLN_ITR_INDX_MASK | /* set noitr */
I40E_PFINT_DYN_CTLN_SWINT_TRIG_MASK |
I40E_PFINT_DYN_CTLN_SW_ITR_INDX_ENA_MASK;
/* allow 00 to be written to the index */
wr32(&vsi->back->hw,
I40E_PFINT_DYN_CTLN(q_vector->v_idx +
vsi->base_vector - 1), val);
} else {
u32 val = I40E_PFINT_DYN_CTL0_INTENA_MASK |
I40E_PFINT_DYN_CTL0_ITR_INDX_MASK | /* set noitr */
I40E_PFINT_DYN_CTL0_SWINT_TRIG_MASK |
I40E_PFINT_DYN_CTL0_SW_ITR_INDX_ENA_MASK;
/* allow 00 to be written to the index */
wr32(&vsi->back->hw, I40E_PFINT_DYN_CTL0, val);
}
}
/**
* i40e_set_new_dynamic_itr - Find new ITR level
* @rc: structure containing ring performance data
*
* Returns true if ITR changed, false if not
*
* Stores a new ITR value based on packets and byte counts during
* the last interrupt. The advantage of per interrupt computation
* is faster updates and more accurate ITR for the current traffic
* pattern. Constants in this function were computed based on
* theoretical maximum wire speed and thresholds were set based on
* testing data as well as attempting to minimize response time
* while increasing bulk throughput.
**/
static bool i40e_set_new_dynamic_itr(struct i40e_ring_container *rc)
{
enum i40e_latency_range new_latency_range = rc->latency_range;
struct i40e_q_vector *qv = rc->ring->q_vector;
u32 new_itr = rc->itr;
int bytes_per_int;
int usecs;
if (rc->total_packets == 0 || !rc->itr)
return false;
/* simple throttlerate management
* 0-10MB/s lowest (50000 ints/s)
* 10-20MB/s low (20000 ints/s)
* 20-1249MB/s bulk (18000 ints/s)
* > 40000 Rx packets per second (8000 ints/s)
*
* The math works out because the divisor is in 10^(-6) which
* turns the bytes/us input value into MB/s values, but
* make sure to use usecs, as the register values written
* are in 2 usec increments in the ITR registers, and make sure
* to use the smoothed values that the countdown timer gives us.
*/
usecs = (rc->itr << 1) * ITR_COUNTDOWN_START;
bytes_per_int = rc->total_bytes / usecs;
switch (new_latency_range) {
case I40E_LOWEST_LATENCY:
if (bytes_per_int > 10)
new_latency_range = I40E_LOW_LATENCY;
break;
case I40E_LOW_LATENCY:
if (bytes_per_int > 20)
new_latency_range = I40E_BULK_LATENCY;
else if (bytes_per_int <= 10)
new_latency_range = I40E_LOWEST_LATENCY;
break;
case I40E_BULK_LATENCY:
case I40E_ULTRA_LATENCY:
default:
if (bytes_per_int <= 20)
new_latency_range = I40E_LOW_LATENCY;
break;
}
/* this is to adjust RX more aggressively when streaming small
* packets. The value of 40000 was picked as it is just beyond
* what the hardware can receive per second if in low latency
* mode.
*/
#define RX_ULTRA_PACKET_RATE 40000
if ((((rc->total_packets * 1000000) / usecs) > RX_ULTRA_PACKET_RATE) &&
(&qv->rx == rc))
new_latency_range = I40E_ULTRA_LATENCY;
rc->latency_range = new_latency_range;
switch (new_latency_range) {
case I40E_LOWEST_LATENCY:
new_itr = I40E_ITR_50K;
break;
case I40E_LOW_LATENCY:
new_itr = I40E_ITR_20K;
break;
case I40E_BULK_LATENCY:
new_itr = I40E_ITR_18K;
break;
case I40E_ULTRA_LATENCY:
new_itr = I40E_ITR_8K;
break;
default:
break;
}
rc->total_bytes = 0;
rc->total_packets = 0;
if (new_itr != rc->itr) {
rc->itr = new_itr;
return true;
}
return false;
}
/**
* i40e_clean_programming_status - clean the programming status descriptor
* @rx_ring: the rx ring that has this descriptor
* @rx_desc: the rx descriptor written back by HW
*
* Flow director should handle FD_FILTER_STATUS to check its filter programming
* status being successful or not and take actions accordingly. FCoE should
* handle its context/filter programming/invalidation status and take actions.
*
**/
static void i40e_clean_programming_status(struct i40e_ring *rx_ring,
union i40e_rx_desc *rx_desc)
{
u64 qw;
u8 id;
qw = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
id = (qw & I40E_RX_PROG_STATUS_DESC_QW1_PROGID_MASK) >>
I40E_RX_PROG_STATUS_DESC_QW1_PROGID_SHIFT;
if (id == I40E_RX_PROG_STATUS_DESC_FD_FILTER_STATUS)
i40e_fd_handle_status(rx_ring, rx_desc, id);
#ifdef I40E_FCOE
else if ((id == I40E_RX_PROG_STATUS_DESC_FCOE_CTXT_PROG_STATUS) ||
(id == I40E_RX_PROG_STATUS_DESC_FCOE_CTXT_INVL_STATUS))
i40e_fcoe_handle_status(rx_ring, rx_desc, id);
#endif
}
/**
* i40e_setup_tx_descriptors - Allocate the Tx descriptors
* @tx_ring: the tx ring to set up
*
* Return 0 on success, negative on error
**/
int i40e_setup_tx_descriptors(struct i40e_ring *tx_ring)
{
struct device *dev = tx_ring->dev;
int bi_size;
if (!dev)
return -ENOMEM;
/* warn if we are about to overwrite the pointer */
WARN_ON(tx_ring->tx_bi);
bi_size = sizeof(struct i40e_tx_buffer) * tx_ring->count;
tx_ring->tx_bi = kzalloc(bi_size, GFP_KERNEL);
if (!tx_ring->tx_bi)
goto err;
/* round up to nearest 4K */
tx_ring->size = tx_ring->count * sizeof(struct i40e_tx_desc);
/* add u32 for head writeback, align after this takes care of
* guaranteeing this is at least one cache line in size
*/
tx_ring->size += sizeof(u32);
tx_ring->size = ALIGN(tx_ring->size, 4096);
tx_ring->desc = dma_alloc_coherent(dev, tx_ring->size,
&tx_ring->dma, GFP_KERNEL);
if (!tx_ring->desc) {
dev_info(dev, "Unable to allocate memory for the Tx descriptor ring, size=%d\n",
tx_ring->size);
goto err;
}
tx_ring->next_to_use = 0;
tx_ring->next_to_clean = 0;
return 0;
err:
kfree(tx_ring->tx_bi);
tx_ring->tx_bi = NULL;
return -ENOMEM;
}
/**
* i40e_clean_rx_ring - Free Rx buffers
* @rx_ring: ring to be cleaned
**/
void i40e_clean_rx_ring(struct i40e_ring *rx_ring)
{
struct device *dev = rx_ring->dev;
struct i40e_rx_buffer *rx_bi;
unsigned long bi_size;
u16 i;
/* ring already cleared, nothing to do */
if (!rx_ring->rx_bi)
return;
if (ring_is_ps_enabled(rx_ring)) {
int bufsz = ALIGN(rx_ring->rx_hdr_len, 256) * rx_ring->count;
rx_bi = &rx_ring->rx_bi[0];
if (rx_bi->hdr_buf) {
dma_free_coherent(dev,
bufsz,
rx_bi->hdr_buf,
rx_bi->dma);
for (i = 0; i < rx_ring->count; i++) {
rx_bi = &rx_ring->rx_bi[i];
rx_bi->dma = 0;
rx_bi->hdr_buf = NULL;
}
}
}
/* Free all the Rx ring sk_buffs */
for (i = 0; i < rx_ring->count; i++) {
rx_bi = &rx_ring->rx_bi[i];
if (rx_bi->dma) {
dma_unmap_single(dev,
rx_bi->dma,
rx_ring->rx_buf_len,
DMA_FROM_DEVICE);
rx_bi->dma = 0;
}
if (rx_bi->skb) {
dev_kfree_skb(rx_bi->skb);
rx_bi->skb = NULL;
}
if (rx_bi->page) {
if (rx_bi->page_dma) {
dma_unmap_page(dev,
rx_bi->page_dma,
PAGE_SIZE,
DMA_FROM_DEVICE);
rx_bi->page_dma = 0;
}
__free_page(rx_bi->page);
rx_bi->page = NULL;
rx_bi->page_offset = 0;
}
}
bi_size = sizeof(struct i40e_rx_buffer) * rx_ring->count;
memset(rx_ring->rx_bi, 0, bi_size);
/* Zero out the descriptor ring */
memset(rx_ring->desc, 0, rx_ring->size);
rx_ring->next_to_clean = 0;
rx_ring->next_to_use = 0;
}
/**
* i40e_free_rx_resources - Free Rx resources
* @rx_ring: ring to clean the resources from
*
* Free all receive software resources
**/
void i40e_free_rx_resources(struct i40e_ring *rx_ring)
{
i40e_clean_rx_ring(rx_ring);
kfree(rx_ring->rx_bi);
rx_ring->rx_bi = NULL;
if (rx_ring->desc) {
dma_free_coherent(rx_ring->dev, rx_ring->size,
rx_ring->desc, rx_ring->dma);
rx_ring->desc = NULL;
}
}
/**
* i40e_alloc_rx_headers - allocate rx header buffers
* @rx_ring: ring to alloc buffers
*
* Allocate rx header buffers for the entire ring. As these are static,
* this is only called when setting up a new ring.
**/
void i40e_alloc_rx_headers(struct i40e_ring *rx_ring)
{
struct device *dev = rx_ring->dev;
struct i40e_rx_buffer *rx_bi;
dma_addr_t dma;
void *buffer;
int buf_size;
int i;
if (rx_ring->rx_bi[0].hdr_buf)
return;
/* Make sure the buffers don't cross cache line boundaries. */
buf_size = ALIGN(rx_ring->rx_hdr_len, 256);
buffer = dma_alloc_coherent(dev, buf_size * rx_ring->count,
&dma, GFP_KERNEL);
if (!buffer)
return;
for (i = 0; i < rx_ring->count; i++) {
rx_bi = &rx_ring->rx_bi[i];
rx_bi->dma = dma + (i * buf_size);
rx_bi->hdr_buf = buffer + (i * buf_size);
}
}
/**
* i40e_setup_rx_descriptors - Allocate Rx descriptors
* @rx_ring: Rx descriptor ring (for a specific queue) to setup
*
* Returns 0 on success, negative on failure
**/
int i40e_setup_rx_descriptors(struct i40e_ring *rx_ring)
{
struct device *dev = rx_ring->dev;
int bi_size;
/* warn if we are about to overwrite the pointer */
WARN_ON(rx_ring->rx_bi);
bi_size = sizeof(struct i40e_rx_buffer) * rx_ring->count;
rx_ring->rx_bi = kzalloc(bi_size, GFP_KERNEL);
if (!rx_ring->rx_bi)
goto err;
u64_stats_init(&rx_ring->syncp);
/* Round up to nearest 4K */
rx_ring->size = ring_is_16byte_desc_enabled(rx_ring)
? rx_ring->count * sizeof(union i40e_16byte_rx_desc)
: rx_ring->count * sizeof(union i40e_32byte_rx_desc);
rx_ring->size = ALIGN(rx_ring->size, 4096);
rx_ring->desc = dma_alloc_coherent(dev, rx_ring->size,
&rx_ring->dma, GFP_KERNEL);
if (!rx_ring->desc) {
dev_info(dev, "Unable to allocate memory for the Rx descriptor ring, size=%d\n",
rx_ring->size);
goto err;
}
rx_ring->next_to_clean = 0;
rx_ring->next_to_use = 0;
return 0;
err:
kfree(rx_ring->rx_bi);
rx_ring->rx_bi = NULL;
return -ENOMEM;
}
/**
* i40e_release_rx_desc - Store the new tail and head values
* @rx_ring: ring to bump
* @val: new head index
**/
static inline void i40e_release_rx_desc(struct i40e_ring *rx_ring, u32 val)
{
rx_ring->next_to_use = val;
/* Force memory writes to complete before letting h/w
* know there are new descriptors to fetch. (Only
* applicable for weak-ordered memory model archs,
* such as IA-64).
*/
wmb();
writel(val, rx_ring->tail);
}
/**
* i40e_alloc_rx_buffers_ps - Replace used receive buffers; packet split
* @rx_ring: ring to place buffers on
* @cleaned_count: number of buffers to replace
*
* Returns true if any errors on allocation
**/
bool i40e_alloc_rx_buffers_ps(struct i40e_ring *rx_ring, u16 cleaned_count)
{
u16 i = rx_ring->next_to_use;
union i40e_rx_desc *rx_desc;
struct i40e_rx_buffer *bi;
const int current_node = numa_node_id();
/* do nothing if no valid netdev defined */
if (!rx_ring->netdev || !cleaned_count)
return false;
while (cleaned_count--) {
rx_desc = I40E_RX_DESC(rx_ring, i);
bi = &rx_ring->rx_bi[i];
if (bi->skb) /* desc is in use */
goto no_buffers;
/* If we've been moved to a different NUMA node, release the
* page so we can get a new one on the current node.
*/
if (bi->page && page_to_nid(bi->page) != current_node) {
dma_unmap_page(rx_ring->dev,
bi->page_dma,
PAGE_SIZE,
DMA_FROM_DEVICE);
__free_page(bi->page);
bi->page = NULL;
bi->page_dma = 0;
rx_ring->rx_stats.realloc_count++;
} else if (bi->page) {
rx_ring->rx_stats.page_reuse_count++;
}
if (!bi->page) {
bi->page = alloc_page(GFP_ATOMIC);
if (!bi->page) {
rx_ring->rx_stats.alloc_page_failed++;
goto no_buffers;
}
bi->page_dma = dma_map_page(rx_ring->dev,
bi->page,
0,
PAGE_SIZE,
DMA_FROM_DEVICE);
if (dma_mapping_error(rx_ring->dev, bi->page_dma)) {
rx_ring->rx_stats.alloc_page_failed++;
__free_page(bi->page);
bi->page = NULL;
bi->page_dma = 0;
bi->page_offset = 0;
goto no_buffers;
}
bi->page_offset = 0;
}
/* Refresh the desc even if buffer_addrs didn't change
* because each write-back erases this info.
*/
rx_desc->read.pkt_addr =
cpu_to_le64(bi->page_dma + bi->page_offset);
rx_desc->read.hdr_addr = cpu_to_le64(bi->dma);
i++;
if (i == rx_ring->count)
i = 0;
}
if (rx_ring->next_to_use != i)
i40e_release_rx_desc(rx_ring, i);
return false;
no_buffers:
if (rx_ring->next_to_use != i)
i40e_release_rx_desc(rx_ring, i);
/* make sure to come back via polling to try again after
* allocation failure
*/
return true;
}
/**
* i40e_alloc_rx_buffers_1buf - Replace used receive buffers; single buffer
* @rx_ring: ring to place buffers on
* @cleaned_count: number of buffers to replace
*
* Returns true if any errors on allocation
**/
bool i40e_alloc_rx_buffers_1buf(struct i40e_ring *rx_ring, u16 cleaned_count)
{
u16 i = rx_ring->next_to_use;
union i40e_rx_desc *rx_desc;
struct i40e_rx_buffer *bi;
struct sk_buff *skb;
/* do nothing if no valid netdev defined */
if (!rx_ring->netdev || !cleaned_count)
return false;
while (cleaned_count--) {
rx_desc = I40E_RX_DESC(rx_ring, i);
bi = &rx_ring->rx_bi[i];
skb = bi->skb;
if (!skb) {
skb = __netdev_alloc_skb_ip_align(rx_ring->netdev,
rx_ring->rx_buf_len,
GFP_ATOMIC |
__GFP_NOWARN);
if (!skb) {
rx_ring->rx_stats.alloc_buff_failed++;
goto no_buffers;
}
/* initialize queue mapping */
skb_record_rx_queue(skb, rx_ring->queue_index);
bi->skb = skb;
}
if (!bi->dma) {
bi->dma = dma_map_single(rx_ring->dev,
skb->data,
rx_ring->rx_buf_len,
DMA_FROM_DEVICE);
if (dma_mapping_error(rx_ring->dev, bi->dma)) {
rx_ring->rx_stats.alloc_buff_failed++;
bi->dma = 0;
dev_kfree_skb(bi->skb);
bi->skb = NULL;
goto no_buffers;
}
}
rx_desc->read.pkt_addr = cpu_to_le64(bi->dma);
rx_desc->read.hdr_addr = 0;
i++;
if (i == rx_ring->count)
i = 0;
}
if (rx_ring->next_to_use != i)
i40e_release_rx_desc(rx_ring, i);
return false;
no_buffers:
if (rx_ring->next_to_use != i)
i40e_release_rx_desc(rx_ring, i);
/* make sure to come back via polling to try again after
* allocation failure
*/
return true;
}
/**
* i40e_receive_skb - Send a completed packet up the stack
* @rx_ring: rx ring in play
* @skb: packet to send up
* @vlan_tag: vlan tag for packet
**/
static void i40e_receive_skb(struct i40e_ring *rx_ring,
struct sk_buff *skb, u16 vlan_tag)
{
struct i40e_q_vector *q_vector = rx_ring->q_vector;
if (vlan_tag & VLAN_VID_MASK)
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tag);
napi_gro_receive(&q_vector->napi, skb);
}
/**
* i40e_rx_checksum - Indicate in skb if hw indicated a good cksum
* @vsi: the VSI we care about
* @skb: skb currently being received and modified
* @rx_status: status value of last descriptor in packet
* @rx_error: error value of last descriptor in packet
* @rx_ptype: ptype value of last descriptor in packet
**/
static inline void i40e_rx_checksum(struct i40e_vsi *vsi,
struct sk_buff *skb,
u32 rx_status,
u32 rx_error,
u16 rx_ptype)
{
struct i40e_rx_ptype_decoded decoded = decode_rx_desc_ptype(rx_ptype);
bool ipv4, ipv6, ipv4_tunnel, ipv6_tunnel;
skb->ip_summed = CHECKSUM_NONE;
/* Rx csum enabled and ip headers found? */
if (!(vsi->netdev->features & NETIF_F_RXCSUM))
return;
/* did the hardware decode the packet and checksum? */
if (!(rx_status & BIT(I40E_RX_DESC_STATUS_L3L4P_SHIFT)))
return;
/* both known and outer_ip must be set for the below code to work */
if (!(decoded.known && decoded.outer_ip))
return;
ipv4 = (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP) &&
(decoded.outer_ip_ver == I40E_RX_PTYPE_OUTER_IPV4);
ipv6 = (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP) &&
(decoded.outer_ip_ver == I40E_RX_PTYPE_OUTER_IPV6);
if (ipv4 &&
(rx_error & (BIT(I40E_RX_DESC_ERROR_IPE_SHIFT) |
BIT(I40E_RX_DESC_ERROR_EIPE_SHIFT))))
goto checksum_fail;
/* likely incorrect csum if alternate IP extension headers found */
if (ipv6 &&
rx_status & BIT(I40E_RX_DESC_STATUS_IPV6EXADD_SHIFT))
/* don't increment checksum err here, non-fatal err */
return;
/* there was some L4 error, count error and punt packet to the stack */
if (rx_error & BIT(I40E_RX_DESC_ERROR_L4E_SHIFT))
goto checksum_fail;
/* handle packets that were not able to be checksummed due
* to arrival speed, in this case the stack can compute
* the csum.
*/
if (rx_error & BIT(I40E_RX_DESC_ERROR_PPRS_SHIFT))
return;
/* The hardware supported by this driver does not validate outer
* checksums for tunneled VXLAN or GENEVE frames. I don't agree
* with it but the specification states that you "MAY validate", it
* doesn't make it a hard requirement so if we have validated the
* inner checksum report CHECKSUM_UNNECESSARY.
*/
ipv4_tunnel = (rx_ptype >= I40E_RX_PTYPE_GRENAT4_MAC_PAY3) &&
(rx_ptype <= I40E_RX_PTYPE_GRENAT4_MACVLAN_IPV6_ICMP_PAY4);
ipv6_tunnel = (rx_ptype >= I40E_RX_PTYPE_GRENAT6_MAC_PAY3) &&
(rx_ptype <= I40E_RX_PTYPE_GRENAT6_MACVLAN_IPV6_ICMP_PAY4);
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb->csum_level = ipv4_tunnel || ipv6_tunnel;
return;
checksum_fail:
vsi->back->hw_csum_rx_error++;
}
/**
* i40e_ptype_to_htype - get a hash type
* @ptype: the ptype value from the descriptor
*
* Returns a hash type to be used by skb_set_hash
**/
static inline enum pkt_hash_types i40e_ptype_to_htype(u8 ptype)
{
struct i40e_rx_ptype_decoded decoded = decode_rx_desc_ptype(ptype);
if (!decoded.known)
return PKT_HASH_TYPE_NONE;
if (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP &&
decoded.payload_layer == I40E_RX_PTYPE_PAYLOAD_LAYER_PAY4)
return PKT_HASH_TYPE_L4;
else if (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP &&
decoded.payload_layer == I40E_RX_PTYPE_PAYLOAD_LAYER_PAY3)
return PKT_HASH_TYPE_L3;
else
return PKT_HASH_TYPE_L2;
}
/**
* i40e_rx_hash - set the hash value in the skb
* @ring: descriptor ring
* @rx_desc: specific descriptor
**/
static inline void i40e_rx_hash(struct i40e_ring *ring,
union i40e_rx_desc *rx_desc,
struct sk_buff *skb,
u8 rx_ptype)
{
u32 hash;
const __le64 rss_mask =
cpu_to_le64((u64)I40E_RX_DESC_FLTSTAT_RSS_HASH <<
I40E_RX_DESC_STATUS_FLTSTAT_SHIFT);
if (ring->netdev->features & NETIF_F_RXHASH)
return;
if ((rx_desc->wb.qword1.status_error_len & rss_mask) == rss_mask) {
hash = le32_to_cpu(rx_desc->wb.qword0.hi_dword.rss);
skb_set_hash(skb, hash, i40e_ptype_to_htype(rx_ptype));
}
}
/**
* i40e_clean_rx_irq_ps - Reclaim resources after receive; packet split
* @rx_ring: rx ring to clean
* @budget: how many cleans we're allowed
*
* Returns true if there's any budget left (e.g. the clean is finished)
**/
static int i40e_clean_rx_irq_ps(struct i40e_ring *rx_ring, const int budget)
{
unsigned int total_rx_bytes = 0, total_rx_packets = 0;
u16 rx_packet_len, rx_header_len, rx_sph, rx_hbo;
u16 cleaned_count = I40E_DESC_UNUSED(rx_ring);
struct i40e_vsi *vsi = rx_ring->vsi;
u16 i = rx_ring->next_to_clean;
union i40e_rx_desc *rx_desc;
u32 rx_error, rx_status;
bool failure = false;
u8 rx_ptype;
u64 qword;
u32 copysize;
if (budget <= 0)
return 0;
do {
struct i40e_rx_buffer *rx_bi;
struct sk_buff *skb;
u16 vlan_tag;
/* return some buffers to hardware, one at a time is too slow */
if (cleaned_count >= I40E_RX_BUFFER_WRITE) {
failure = failure ||
i40e_alloc_rx_buffers_ps(rx_ring,
cleaned_count);
cleaned_count = 0;
}
i = rx_ring->next_to_clean;
rx_desc = I40E_RX_DESC(rx_ring, i);
qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
rx_status = (qword & I40E_RXD_QW1_STATUS_MASK) >>
I40E_RXD_QW1_STATUS_SHIFT;
if (!(rx_status & BIT(I40E_RX_DESC_STATUS_DD_SHIFT)))
break;
/* This memory barrier is needed to keep us from reading
* any other fields out of the rx_desc until we know the
* DD bit is set.
*/
dma_rmb();
/* sync header buffer for reading */
dma_sync_single_range_for_cpu(rx_ring->dev,
rx_ring->rx_bi[0].dma,
i * rx_ring->rx_hdr_len,
rx_ring->rx_hdr_len,
DMA_FROM_DEVICE);
if (i40e_rx_is_programming_status(qword)) {
i40e_clean_programming_status(rx_ring, rx_desc);
I40E_RX_INCREMENT(rx_ring, i);
continue;
}
rx_bi = &rx_ring->rx_bi[i];
skb = rx_bi->skb;
if (likely(!skb)) {
skb = __netdev_alloc_skb_ip_align(rx_ring->netdev,
rx_ring->rx_hdr_len,
GFP_ATOMIC |
__GFP_NOWARN);
if (!skb) {
rx_ring->rx_stats.alloc_buff_failed++;
failure = true;
break;
}
/* initialize queue mapping */
skb_record_rx_queue(skb, rx_ring->queue_index);
/* we are reusing so sync this buffer for CPU use */
dma_sync_single_range_for_cpu(rx_ring->dev,
rx_ring->rx_bi[0].dma,
i * rx_ring->rx_hdr_len,
rx_ring->rx_hdr_len,
DMA_FROM_DEVICE);
}
rx_packet_len = (qword & I40E_RXD_QW1_LENGTH_PBUF_MASK) >>
I40E_RXD_QW1_LENGTH_PBUF_SHIFT;
rx_header_len = (qword & I40E_RXD_QW1_LENGTH_HBUF_MASK) >>
I40E_RXD_QW1_LENGTH_HBUF_SHIFT;
rx_sph = (qword & I40E_RXD_QW1_LENGTH_SPH_MASK) >>
I40E_RXD_QW1_LENGTH_SPH_SHIFT;
rx_error = (qword & I40E_RXD_QW1_ERROR_MASK) >>
I40E_RXD_QW1_ERROR_SHIFT;
rx_hbo = rx_error & BIT(I40E_RX_DESC_ERROR_HBO_SHIFT);
rx_error &= ~BIT(I40E_RX_DESC_ERROR_HBO_SHIFT);
rx_ptype = (qword & I40E_RXD_QW1_PTYPE_MASK) >>
I40E_RXD_QW1_PTYPE_SHIFT;
/* sync half-page for reading */
dma_sync_single_range_for_cpu(rx_ring->dev,
rx_bi->page_dma,
rx_bi->page_offset,
PAGE_SIZE / 2,
DMA_FROM_DEVICE);
prefetch(page_address(rx_bi->page) + rx_bi->page_offset);
rx_bi->skb = NULL;
cleaned_count++;
copysize = 0;
if (rx_hbo || rx_sph) {
int len;
if (rx_hbo)
len = I40E_RX_HDR_SIZE;
else
len = rx_header_len;
memcpy(__skb_put(skb, len), rx_bi->hdr_buf, len);
} else if (skb->len == 0) {
int len;
unsigned char *va = page_address(rx_bi->page) +
rx_bi->page_offset;
len = min(rx_packet_len, rx_ring->rx_hdr_len);
memcpy(__skb_put(skb, len), va, len);
copysize = len;
rx_packet_len -= len;
}
/* Get the rest of the data if this was a header split */
if (rx_packet_len) {
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
rx_bi->page,
rx_bi->page_offset + copysize,
rx_packet_len, I40E_RXBUFFER_2048);
/* If the page count is more than 2, then both halves
* of the page are used and we need to free it. Do it
* here instead of in the alloc code. Otherwise one
* of the half-pages might be released between now and
* then, and we wouldn't know which one to use.
* Don't call get_page and free_page since those are
* both expensive atomic operations that just change
* the refcount in opposite directions. Just give the
* page to the stack; he can have our refcount.
*/
if (page_count(rx_bi->page) > 2) {
dma_unmap_page(rx_ring->dev,
rx_bi->page_dma,
PAGE_SIZE,
DMA_FROM_DEVICE);
rx_bi->page = NULL;
rx_bi->page_dma = 0;
rx_ring->rx_stats.realloc_count++;
} else {
get_page(rx_bi->page);
/* switch to the other half-page here; the
* allocation code programs the right addr
* into HW. If we haven't used this half-page,
* the address won't be changed, and HW can
* just use it next time through.
*/
rx_bi->page_offset ^= PAGE_SIZE / 2;
}
}
I40E_RX_INCREMENT(rx_ring, i);
if (unlikely(
!(rx_status & BIT(I40E_RX_DESC_STATUS_EOF_SHIFT)))) {
struct i40e_rx_buffer *next_buffer;
next_buffer = &rx_ring->rx_bi[i];
next_buffer->skb = skb;
rx_ring->rx_stats.non_eop_descs++;
continue;
}
/* ERR_MASK will only have valid bits if EOP set */
if (unlikely(rx_error & BIT(I40E_RX_DESC_ERROR_RXE_SHIFT))) {
dev_kfree_skb_any(skb);
continue;
}
i40e_rx_hash(rx_ring, rx_desc, skb, rx_ptype);
if (unlikely(rx_status & I40E_RXD_QW1_STATUS_TSYNVALID_MASK)) {
i40e_ptp_rx_hwtstamp(vsi->back, skb, (rx_status &
I40E_RXD_QW1_STATUS_TSYNINDX_MASK) >>
I40E_RXD_QW1_STATUS_TSYNINDX_SHIFT);
rx_ring->last_rx_timestamp = jiffies;
}
/* probably a little skewed due to removing CRC */
total_rx_bytes += skb->len;
total_rx_packets++;
skb->protocol = eth_type_trans(skb, rx_ring->netdev);
i40e_rx_checksum(vsi, skb, rx_status, rx_error, rx_ptype);
vlan_tag = rx_status & BIT(I40E_RX_DESC_STATUS_L2TAG1P_SHIFT)
? le16_to_cpu(rx_desc->wb.qword0.lo_dword.l2tag1)
: 0;
#ifdef I40E_FCOE
if (unlikely(
i40e_rx_is_fcoe(rx_ptype) &&
!i40e_fcoe_handle_offload(rx_ring, rx_desc, skb))) {
dev_kfree_skb_any(skb);
continue;
}
#endif
i40e_receive_skb(rx_ring, skb, vlan_tag);
rx_desc->wb.qword1.status_error_len = 0;
} while (likely(total_rx_packets < budget));
u64_stats_update_begin(&rx_ring->syncp);
rx_ring->stats.packets += total_rx_packets;
rx_ring->stats.bytes += total_rx_bytes;
u64_stats_update_end(&rx_ring->syncp);
rx_ring->q_vector->rx.total_packets += total_rx_packets;
rx_ring->q_vector->rx.total_bytes += total_rx_bytes;
return failure ? budget : total_rx_packets;
}
/**
* i40e_clean_rx_irq_1buf - Reclaim resources after receive; single buffer
* @rx_ring: rx ring to clean
* @budget: how many cleans we're allowed
*
* Returns number of packets cleaned
**/
static int i40e_clean_rx_irq_1buf(struct i40e_ring *rx_ring, int budget)
{
unsigned int total_rx_bytes = 0, total_rx_packets = 0;
u16 cleaned_count = I40E_DESC_UNUSED(rx_ring);
struct i40e_vsi *vsi = rx_ring->vsi;
union i40e_rx_desc *rx_desc;
u32 rx_error, rx_status;
u16 rx_packet_len;
bool failure = false;
u8 rx_ptype;
u64 qword;
u16 i;
do {
struct i40e_rx_buffer *rx_bi;
struct sk_buff *skb;
u16 vlan_tag;
/* return some buffers to hardware, one at a time is too slow */
if (cleaned_count >= I40E_RX_BUFFER_WRITE) {
failure = failure ||
i40e_alloc_rx_buffers_1buf(rx_ring,
cleaned_count);
cleaned_count = 0;
}
i = rx_ring->next_to_clean;
rx_desc = I40E_RX_DESC(rx_ring, i);
qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
rx_status = (qword & I40E_RXD_QW1_STATUS_MASK) >>
I40E_RXD_QW1_STATUS_SHIFT;
if (!(rx_status & BIT(I40E_RX_DESC_STATUS_DD_SHIFT)))
break;
/* This memory barrier is needed to keep us from reading
* any other fields out of the rx_desc until we know the
* DD bit is set.
*/
dma_rmb();
if (i40e_rx_is_programming_status(qword)) {
i40e_clean_programming_status(rx_ring, rx_desc);
I40E_RX_INCREMENT(rx_ring, i);
continue;
}
rx_bi = &rx_ring->rx_bi[i];
skb = rx_bi->skb;
prefetch(skb->data);
rx_packet_len = (qword & I40E_RXD_QW1_LENGTH_PBUF_MASK) >>
I40E_RXD_QW1_LENGTH_PBUF_SHIFT;
rx_error = (qword & I40E_RXD_QW1_ERROR_MASK) >>
I40E_RXD_QW1_ERROR_SHIFT;
rx_error &= ~BIT(I40E_RX_DESC_ERROR_HBO_SHIFT);
rx_ptype = (qword & I40E_RXD_QW1_PTYPE_MASK) >>
I40E_RXD_QW1_PTYPE_SHIFT;
rx_bi->skb = NULL;
cleaned_count++;
/* Get the header and possibly the whole packet
* If this is an skb from previous receive dma will be 0
*/
skb_put(skb, rx_packet_len);
dma_unmap_single(rx_ring->dev, rx_bi->dma, rx_ring->rx_buf_len,
DMA_FROM_DEVICE);
rx_bi->dma = 0;
I40E_RX_INCREMENT(rx_ring, i);
if (unlikely(
!(rx_status & BIT(I40E_RX_DESC_STATUS_EOF_SHIFT)))) {
rx_ring->rx_stats.non_eop_descs++;
continue;
}
/* ERR_MASK will only have valid bits if EOP set */
if (unlikely(rx_error & BIT(I40E_RX_DESC_ERROR_RXE_SHIFT))) {
dev_kfree_skb_any(skb);
continue;
}
i40e_rx_hash(rx_ring, rx_desc, skb, rx_ptype);
if (unlikely(rx_status & I40E_RXD_QW1_STATUS_TSYNVALID_MASK)) {
i40e_ptp_rx_hwtstamp(vsi->back, skb, (rx_status &
I40E_RXD_QW1_STATUS_TSYNINDX_MASK) >>
I40E_RXD_QW1_STATUS_TSYNINDX_SHIFT);
rx_ring->last_rx_timestamp = jiffies;
}
/* probably a little skewed due to removing CRC */
total_rx_bytes += skb->len;
total_rx_packets++;
skb->protocol = eth_type_trans(skb, rx_ring->netdev);
i40e_rx_checksum(vsi, skb, rx_status, rx_error, rx_ptype);
vlan_tag = rx_status & BIT(I40E_RX_DESC_STATUS_L2TAG1P_SHIFT)
? le16_to_cpu(rx_desc->wb.qword0.lo_dword.l2tag1)
: 0;
#ifdef I40E_FCOE
if (unlikely(
i40e_rx_is_fcoe(rx_ptype) &&
!i40e_fcoe_handle_offload(rx_ring, rx_desc, skb))) {
dev_kfree_skb_any(skb);
continue;
}
#endif
i40e_receive_skb(rx_ring, skb, vlan_tag);
rx_desc->wb.qword1.status_error_len = 0;
} while (likely(total_rx_packets < budget));
u64_stats_update_begin(&rx_ring->syncp);
rx_ring->stats.packets += total_rx_packets;
rx_ring->stats.bytes += total_rx_bytes;
u64_stats_update_end(&rx_ring->syncp);
rx_ring->q_vector->rx.total_packets += total_rx_packets;
rx_ring->q_vector->rx.total_bytes += total_rx_bytes;
return failure ? budget : total_rx_packets;
}
static u32 i40e_buildreg_itr(const int type, const u16 itr)
{
u32 val;
val = I40E_PFINT_DYN_CTLN_INTENA_MASK |
/* Don't clear PBA because that can cause lost interrupts that
* came in while we were cleaning/polling
*/
(type << I40E_PFINT_DYN_CTLN_ITR_INDX_SHIFT) |
(itr << I40E_PFINT_DYN_CTLN_INTERVAL_SHIFT);
return val;
}
/* a small macro to shorten up some long lines */
#define INTREG I40E_PFINT_DYN_CTLN
/**
* i40e_update_enable_itr - Update itr and re-enable MSIX interrupt
* @vsi: the VSI we care about
* @q_vector: q_vector for which itr is being updated and interrupt enabled
*
**/
static inline void i40e_update_enable_itr(struct i40e_vsi *vsi,
struct i40e_q_vector *q_vector)
{
struct i40e_hw *hw = &vsi->back->hw;
bool rx = false, tx = false;
u32 rxval, txval;
int vector;
int idx = q_vector->v_idx;
vector = (q_vector->v_idx + vsi->base_vector);
/* avoid dynamic calculation if in countdown mode OR if
* all dynamic is disabled
*/
rxval = txval = i40e_buildreg_itr(I40E_ITR_NONE, 0);
if (q_vector->itr_countdown > 0 ||
(!ITR_IS_DYNAMIC(vsi->rx_rings[idx]->rx_itr_setting) &&
!ITR_IS_DYNAMIC(vsi->tx_rings[idx]->tx_itr_setting))) {
goto enable_int;
}
if (ITR_IS_DYNAMIC(vsi->rx_rings[idx]->rx_itr_setting)) {
rx = i40e_set_new_dynamic_itr(&q_vector->rx);
rxval = i40e_buildreg_itr(I40E_RX_ITR, q_vector->rx.itr);
}
if (ITR_IS_DYNAMIC(vsi->tx_rings[idx]->tx_itr_setting)) {
tx = i40e_set_new_dynamic_itr(&q_vector->tx);
txval = i40e_buildreg_itr(I40E_TX_ITR, q_vector->tx.itr);
}
if (rx || tx) {
/* get the higher of the two ITR adjustments and
* use the same value for both ITR registers
* when in adaptive mode (Rx and/or Tx)
*/
u16 itr = max(q_vector->tx.itr, q_vector->rx.itr);
q_vector->tx.itr = q_vector->rx.itr = itr;
txval = i40e_buildreg_itr(I40E_TX_ITR, itr);
tx = true;
rxval = i40e_buildreg_itr(I40E_RX_ITR, itr);
rx = true;
}
/* only need to enable the interrupt once, but need
* to possibly update both ITR values
*/
if (rx) {
/* set the INTENA_MSK_MASK so that this first write
* won't actually enable the interrupt, instead just
* updating the ITR (it's bit 31 PF and VF)
*/
rxval |= BIT(31);
/* don't check _DOWN because interrupt isn't being enabled */
wr32(hw, INTREG(vector - 1), rxval);
}
enable_int:
if (!test_bit(__I40E_DOWN, &vsi->state))
wr32(hw, INTREG(vector - 1), txval);
if (q_vector->itr_countdown)
q_vector->itr_countdown--;
else
q_vector->itr_countdown = ITR_COUNTDOWN_START;
}
/**
* i40e_napi_poll - NAPI polling Rx/Tx cleanup routine
* @napi: napi struct with our devices info in it
* @budget: amount of work driver is allowed to do this pass, in packets
*
* This function will clean all queues associated with a q_vector.
*
* Returns the amount of work done
**/
int i40e_napi_poll(struct napi_struct *napi, int budget)
{
struct i40e_q_vector *q_vector =
container_of(napi, struct i40e_q_vector, napi);
struct i40e_vsi *vsi = q_vector->vsi;
struct i40e_ring *ring;
bool clean_complete = true;
bool arm_wb = false;
int budget_per_ring;
int work_done = 0;
if (test_bit(__I40E_DOWN, &vsi->state)) {
napi_complete(napi);
return 0;
}
/* Clear hung_detected bit */
clear_bit(I40E_Q_VECTOR_HUNG_DETECT, &q_vector->hung_detected);
/* Since the actual Tx work is minimal, we can give the Tx a larger
* budget and be more aggressive about cleaning up the Tx descriptors.
*/
i40e_for_each_ring(ring, q_vector->tx) {
if (!i40e_clean_tx_irq(vsi, ring, budget)) {
clean_complete = false;
continue;
}
arm_wb |= ring->arm_wb;
ring->arm_wb = false;
}
/* Handle case where we are called by netpoll with a budget of 0 */
if (budget <= 0)
goto tx_only;
/* We attempt to distribute budget to each Rx queue fairly, but don't
* allow the budget to go below 1 because that would exit polling early.
*/
budget_per_ring = max(budget/q_vector->num_ringpairs, 1);
i40e_for_each_ring(ring, q_vector->rx) {
int cleaned;
if (ring_is_ps_enabled(ring))
cleaned = i40e_clean_rx_irq_ps(ring, budget_per_ring);
else
cleaned = i40e_clean_rx_irq_1buf(ring, budget_per_ring);
work_done += cleaned;
/* if we clean as many as budgeted, we must not be done */
if (cleaned >= budget_per_ring)
clean_complete = false;
}
/* If work not completed, return budget and polling will return */
if (!clean_complete) {
tx_only:
if (arm_wb) {
q_vector->tx.ring[0].tx_stats.tx_force_wb++;
i40e_enable_wb_on_itr(vsi, q_vector);
}
return budget;
}
if (vsi->back->flags & I40E_TXR_FLAGS_WB_ON_ITR)
q_vector->arm_wb_state = false;
/* Work is done so exit the polling mode and re-enable the interrupt */
napi_complete_done(napi, work_done);
if (vsi->back->flags & I40E_FLAG_MSIX_ENABLED) {
i40e_update_enable_itr(vsi, q_vector);
} else { /* Legacy mode */
i40e_irq_dynamic_enable_icr0(vsi->back, false);
}
return 0;
}
/**
* i40e_atr - Add a Flow Director ATR filter
* @tx_ring: ring to add programming descriptor to
* @skb: send buffer
* @tx_flags: send tx flags
**/
static void i40e_atr(struct i40e_ring *tx_ring, struct sk_buff *skb,
u32 tx_flags)
{
struct i40e_filter_program_desc *fdir_desc;
struct i40e_pf *pf = tx_ring->vsi->back;
union {
unsigned char *network;
struct iphdr *ipv4;
struct ipv6hdr *ipv6;
} hdr;
struct tcphdr *th;
unsigned int hlen;
u32 flex_ptype, dtype_cmd;
int l4_proto;
u16 i;
/* make sure ATR is enabled */
if (!(pf->flags & I40E_FLAG_FD_ATR_ENABLED))
return;
if ((pf->auto_disable_flags & I40E_FLAG_FD_ATR_ENABLED))
return;
/* if sampling is disabled do nothing */
if (!tx_ring->atr_sample_rate)
return;
/* Currently only IPv4/IPv6 with TCP is supported */
if (!(tx_flags & (I40E_TX_FLAGS_IPV4 | I40E_TX_FLAGS_IPV6)))
return;
/* snag network header to get L4 type and address */
hdr.network = (tx_flags & I40E_TX_FLAGS_UDP_TUNNEL) ?
skb_inner_network_header(skb) : skb_network_header(skb);
/* Note: tx_flags gets modified to reflect inner protocols in
* tx_enable_csum function if encap is enabled.
*/
if (tx_flags & I40E_TX_FLAGS_IPV4) {
/* access ihl as u8 to avoid unaligned access on ia64 */
hlen = (hdr.network[0] & 0x0F) << 2;
l4_proto = hdr.ipv4->protocol;
} else {
hlen = hdr.network - skb->data;
l4_proto = ipv6_find_hdr(skb, &hlen, IPPROTO_TCP, NULL, NULL);
hlen -= hdr.network - skb->data;
}
if (l4_proto != IPPROTO_TCP)
return;
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;
if ((pf->flags & I40E_FLAG_HW_ATR_EVICT_CAPABLE) &&
(!(pf->auto_disable_flags & I40E_FLAG_HW_ATR_EVICT_CAPABLE))) {
/* HW ATR eviction will take care of removing filters on FIN
* and RST packets.
*/
if (th->fin || th->rst)
return;
}
tx_ring->atr_count++;
/* sample on all syn/fin/rst packets or once every atr sample rate */
if (!th->fin &&
!th->syn &&
!th->rst &&
(tx_ring->atr_count < tx_ring->atr_sample_rate))
return;
tx_ring->atr_count = 0;
/* 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 = (tx_ring->queue_index << I40E_TXD_FLTR_QW0_QINDEX_SHIFT) &
I40E_TXD_FLTR_QW0_QINDEX_MASK;
flex_ptype |= (tx_flags & I40E_TX_FLAGS_IPV4) ?
(I40E_FILTER_PCTYPE_NONF_IPV4_TCP <<
I40E_TXD_FLTR_QW0_PCTYPE_SHIFT) :
(I40E_FILTER_PCTYPE_NONF_IPV6_TCP <<
I40E_TXD_FLTR_QW0_PCTYPE_SHIFT);
flex_ptype |= tx_ring->vsi->id << I40E_TXD_FLTR_QW0_DEST_VSI_SHIFT;
dtype_cmd = I40E_TX_DESC_DTYPE_FILTER_PROG;
dtype_cmd |= (th->fin || th->rst) ?
(I40E_FILTER_PROGRAM_DESC_PCMD_REMOVE <<
I40E_TXD_FLTR_QW1_PCMD_SHIFT) :
(I40E_FILTER_PROGRAM_DESC_PCMD_ADD_UPDATE <<
I40E_TXD_FLTR_QW1_PCMD_SHIFT);
dtype_cmd |= I40E_FILTER_PROGRAM_DESC_DEST_DIRECT_PACKET_QINDEX <<
I40E_TXD_FLTR_QW1_DEST_SHIFT;
dtype_cmd |= I40E_FILTER_PROGRAM_DESC_FD_STATUS_FD_ID <<
I40E_TXD_FLTR_QW1_FD_STATUS_SHIFT;
dtype_cmd |= I40E_TXD_FLTR_QW1_CNT_ENA_MASK;
if (!(tx_flags & I40E_TX_FLAGS_UDP_TUNNEL))
dtype_cmd |=
((u32)I40E_FD_ATR_STAT_IDX(pf->hw.pf_id) <<
I40E_TXD_FLTR_QW1_CNTINDEX_SHIFT) &
I40E_TXD_FLTR_QW1_CNTINDEX_MASK;
else
dtype_cmd |=
((u32)I40E_FD_ATR_TUNNEL_STAT_IDX(pf->hw.pf_id) <<
I40E_TXD_FLTR_QW1_CNTINDEX_SHIFT) &
I40E_TXD_FLTR_QW1_CNTINDEX_MASK;
if ((pf->flags & I40E_FLAG_HW_ATR_EVICT_CAPABLE) &&
(!(pf->auto_disable_flags & I40E_FLAG_HW_ATR_EVICT_CAPABLE)))
dtype_cmd |= I40E_TXD_FLTR_QW1_ATR_MASK;
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(0);
}
/**
* i40e_tx_prepare_vlan_flags - prepare generic TX VLAN tagging flags for HW
* @skb: send buffer
* @tx_ring: ring to send buffer on
* @flags: the tx flags to be set
*
* Checks the skb and set up correspondingly several generic transmit flags
* related to VLAN tagging for the HW, such as VLAN, DCB, etc.
*
* Returns error code indicate the frame should be dropped upon error and the
* otherwise returns 0 to indicate the flags has been set properly.
**/
#ifdef I40E_FCOE
inline int i40e_tx_prepare_vlan_flags(struct sk_buff *skb,
struct i40e_ring *tx_ring,
u32 *flags)
#else
static inline int i40e_tx_prepare_vlan_flags(struct sk_buff *skb,
struct i40e_ring *tx_ring,
u32 *flags)
#endif
{
__be16 protocol = skb->protocol;
u32 tx_flags = 0;
if (protocol == htons(ETH_P_8021Q) &&
!(tx_ring->netdev->features & NETIF_F_HW_VLAN_CTAG_TX)) {
/* When HW VLAN acceleration is turned off by the user the
* stack sets the protocol to 8021q so that the driver
* can take any steps required to support the SW only
* VLAN handling. In our case the driver doesn't need
* to take any further steps so just set the protocol
* to the encapsulated ethertype.
*/
skb->protocol = vlan_get_protocol(skb);
goto out;
}
/* if we have a HW VLAN tag being added, default to the HW one */
if (skb_vlan_tag_present(skb)) {
tx_flags |= skb_vlan_tag_get(skb) << I40E_TX_FLAGS_VLAN_SHIFT;
tx_flags |= I40E_TX_FLAGS_HW_VLAN;
/* else if it is a SW VLAN, check the next protocol and store the tag */
} else if (protocol == htons(ETH_P_8021Q)) {
struct vlan_hdr *vhdr, _vhdr;
vhdr = skb_header_pointer(skb, ETH_HLEN, sizeof(_vhdr), &_vhdr);
if (!vhdr)
return -EINVAL;
protocol = vhdr->h_vlan_encapsulated_proto;
tx_flags |= ntohs(vhdr->h_vlan_TCI) << I40E_TX_FLAGS_VLAN_SHIFT;
tx_flags |= I40E_TX_FLAGS_SW_VLAN;
}
if (!(tx_ring->vsi->back->flags & I40E_FLAG_DCB_ENABLED))
goto out;
/* Insert 802.1p priority into VLAN header */
if ((tx_flags & (I40E_TX_FLAGS_HW_VLAN | I40E_TX_FLAGS_SW_VLAN)) ||
(skb->priority != TC_PRIO_CONTROL)) {
tx_flags &= ~I40E_TX_FLAGS_VLAN_PRIO_MASK;
tx_flags |= (skb->priority & 0x7) <<
I40E_TX_FLAGS_VLAN_PRIO_SHIFT;
if (tx_flags & I40E_TX_FLAGS_SW_VLAN) {
struct vlan_ethhdr *vhdr;
int rc;
rc = skb_cow_head(skb, 0);
if (rc < 0)
return rc;
vhdr = (struct vlan_ethhdr *)skb->data;
vhdr->h_vlan_TCI = htons(tx_flags >>
I40E_TX_FLAGS_VLAN_SHIFT);
} else {
tx_flags |= I40E_TX_FLAGS_HW_VLAN;
}
}
out:
*flags = tx_flags;
return 0;
}
/**
* i40e_tso - set up the tso context descriptor
* @skb: ptr to the skb we're sending
* @hdr_len: ptr to the size of the packet header
* @cd_type_cmd_tso_mss: Quad Word 1
*
* Returns 0 if no TSO can happen, 1 if tso is going, or error
**/
static int i40e_tso(struct sk_buff *skb, u8 *hdr_len, u64 *cd_type_cmd_tso_mss)
{
u64 cd_cmd, cd_tso_len, cd_mss;
union {
struct iphdr *v4;
struct ipv6hdr *v6;
unsigned char *hdr;
} ip;
union {
struct tcphdr *tcp;
struct udphdr *udp;
unsigned char *hdr;
} l4;
u32 paylen, l4_offset;
int err;
if (skb->ip_summed != CHECKSUM_PARTIAL)
return 0;
if (!skb_is_gso(skb))
return 0;
err = skb_cow_head(skb, 0);
if (err < 0)
return err;
ip.hdr = skb_network_header(skb);
l4.hdr = skb_transport_header(skb);
/* initialize outer IP header fields */
if (ip.v4->version == 4) {
ip.v4->tot_len = 0;
ip.v4->check = 0;
} else {
ip.v6->payload_len = 0;
}
if (skb_shinfo(skb)->gso_type & (SKB_GSO_UDP_TUNNEL | SKB_GSO_GRE |
SKB_GSO_UDP_TUNNEL_CSUM)) {
if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM) {
/* determine offset of outer transport header */
l4_offset = l4.hdr - skb->data;
/* remove payload length from outer checksum */
paylen = skb->len - l4_offset;
csum_replace_by_diff(&l4.udp->check, htonl(paylen));
}
/* reset pointers to inner headers */
ip.hdr = skb_inner_network_header(skb);
l4.hdr = skb_inner_transport_header(skb);
/* initialize inner IP header fields */
if (ip.v4->version == 4) {
ip.v4->tot_len = 0;
ip.v4->check = 0;
} else {
ip.v6->payload_len = 0;
}
}
/* determine offset of inner transport header */
l4_offset = l4.hdr - skb->data;
/* remove payload length from inner checksum */
paylen = skb->len - l4_offset;
csum_replace_by_diff(&l4.tcp->check, htonl(paylen));
/* compute length of segmentation header */
*hdr_len = (l4.tcp->doff * 4) + l4_offset;
/* find the field values */
cd_cmd = I40E_TX_CTX_DESC_TSO;
cd_tso_len = skb->len - *hdr_len;
cd_mss = skb_shinfo(skb)->gso_size;
*cd_type_cmd_tso_mss |= (cd_cmd << I40E_TXD_CTX_QW1_CMD_SHIFT) |
(cd_tso_len << I40E_TXD_CTX_QW1_TSO_LEN_SHIFT) |
(cd_mss << I40E_TXD_CTX_QW1_MSS_SHIFT);
return 1;
}
/**
* i40e_tsyn - set up the tsyn context descriptor
* @tx_ring: ptr to the ring to send
* @skb: ptr to the skb we're sending
* @tx_flags: the collected send information
* @cd_type_cmd_tso_mss: Quad Word 1
*
* Returns 0 if no Tx timestamp can happen and 1 if the timestamp will happen
**/
static int i40e_tsyn(struct i40e_ring *tx_ring, struct sk_buff *skb,
u32 tx_flags, u64 *cd_type_cmd_tso_mss)
{
struct i40e_pf *pf;
if (likely(!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)))
return 0;
/* Tx timestamps cannot be sampled when doing TSO */
if (tx_flags & I40E_TX_FLAGS_TSO)
return 0;
/* only timestamp the outbound packet if the user has requested it and
* we are not already transmitting a packet to be timestamped
*/
pf = i40e_netdev_to_pf(tx_ring->netdev);
if (!(pf->flags & I40E_FLAG_PTP))
return 0;
if (pf->ptp_tx &&
!test_and_set_bit_lock(__I40E_PTP_TX_IN_PROGRESS, &pf->state)) {
skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
pf->ptp_tx_skb = skb_get(skb);
} else {
return 0;
}
*cd_type_cmd_tso_mss |= (u64)I40E_TX_CTX_DESC_TSYN <<
I40E_TXD_CTX_QW1_CMD_SHIFT;
return 1;
}
/**
* i40e_tx_enable_csum - Enable Tx checksum offloads
* @skb: send buffer
* @tx_flags: pointer to Tx flags currently set
* @td_cmd: Tx descriptor command bits to set
* @td_offset: Tx descriptor header offsets to set
* @tx_ring: Tx descriptor ring
* @cd_tunneling: ptr to context desc bits
**/
static int i40e_tx_enable_csum(struct sk_buff *skb, u32 *tx_flags,
u32 *td_cmd, u32 *td_offset,
struct i40e_ring *tx_ring,
u32 *cd_tunneling)
{
union {
struct iphdr *v4;
struct ipv6hdr *v6;
unsigned char *hdr;
} ip;
union {
struct tcphdr *tcp;
struct udphdr *udp;
unsigned char *hdr;
} l4;
unsigned char *exthdr;
u32 offset, cmd = 0;
__be16 frag_off;
u8 l4_proto = 0;
if (skb->ip_summed != CHECKSUM_PARTIAL)
return 0;
ip.hdr = skb_network_header(skb);
l4.hdr = skb_transport_header(skb);
/* compute outer L2 header size */
offset = ((ip.hdr - skb->data) / 2) << I40E_TX_DESC_LENGTH_MACLEN_SHIFT;
if (skb->encapsulation) {
u32 tunnel = 0;
/* define outer network header type */
if (*tx_flags & I40E_TX_FLAGS_IPV4) {
tunnel |= (*tx_flags & I40E_TX_FLAGS_TSO) ?
I40E_TX_CTX_EXT_IP_IPV4 :
I40E_TX_CTX_EXT_IP_IPV4_NO_CSUM;
l4_proto = ip.v4->protocol;
} else if (*tx_flags & I40E_TX_FLAGS_IPV6) {
tunnel |= I40E_TX_CTX_EXT_IP_IPV6;
exthdr = ip.hdr + sizeof(*ip.v6);
l4_proto = ip.v6->nexthdr;
if (l4.hdr != exthdr)
ipv6_skip_exthdr(skb, exthdr - skb->data,
&l4_proto, &frag_off);
}
/* compute outer L3 header size */
tunnel |= ((l4.hdr - ip.hdr) / 4) <<
I40E_TXD_CTX_QW0_EXT_IPLEN_SHIFT;
/* switch IP header pointer from outer to inner header */
ip.hdr = skb_inner_network_header(skb);
/* define outer transport */
switch (l4_proto) {
case IPPROTO_UDP:
tunnel |= I40E_TXD_CTX_UDP_TUNNELING;
*tx_flags |= I40E_TX_FLAGS_UDP_TUNNEL;
break;
case IPPROTO_GRE:
tunnel |= I40E_TXD_CTX_GRE_TUNNELING;
*tx_flags |= I40E_TX_FLAGS_UDP_TUNNEL;
break;
default:
if (*tx_flags & I40E_TX_FLAGS_TSO)
return -1;
skb_checksum_help(skb);
return 0;
}
/* compute tunnel header size */
tunnel |= ((ip.hdr - l4.hdr) / 2) <<
I40E_TXD_CTX_QW0_NATLEN_SHIFT;
/* indicate if we need to offload outer UDP header */
if ((*tx_flags & I40E_TX_FLAGS_TSO) &&
(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM))
tunnel |= I40E_TXD_CTX_QW0_L4T_CS_MASK;
/* record tunnel offload values */
*cd_tunneling |= tunnel;
/* switch L4 header pointer from outer to inner */
l4.hdr = skb_inner_transport_header(skb);
l4_proto = 0;
/* reset type as we transition from outer to inner headers */
*tx_flags &= ~(I40E_TX_FLAGS_IPV4 | I40E_TX_FLAGS_IPV6);
if (ip.v4->version == 4)
*tx_flags |= I40E_TX_FLAGS_IPV4;
if (ip.v6->version == 6)
*tx_flags |= I40E_TX_FLAGS_IPV6;
}
/* Enable IP checksum offloads */
if (*tx_flags & I40E_TX_FLAGS_IPV4) {
l4_proto = ip.v4->protocol;
/* the stack computes the IP header already, the only time we
* need the hardware to recompute it is in the case of TSO.
*/
cmd |= (*tx_flags & I40E_TX_FLAGS_TSO) ?
I40E_TX_DESC_CMD_IIPT_IPV4_CSUM :
I40E_TX_DESC_CMD_IIPT_IPV4;
} else if (*tx_flags & I40E_TX_FLAGS_IPV6) {
cmd |= I40E_TX_DESC_CMD_IIPT_IPV6;
exthdr = ip.hdr + sizeof(*ip.v6);
l4_proto = ip.v6->nexthdr;
if (l4.hdr != exthdr)
ipv6_skip_exthdr(skb, exthdr - skb->data,
&l4_proto, &frag_off);
}
/* compute inner L3 header size */
offset |= ((l4.hdr - ip.hdr) / 4) << I40E_TX_DESC_LENGTH_IPLEN_SHIFT;
/* Enable L4 checksum offloads */
switch (l4_proto) {
case IPPROTO_TCP:
/* enable checksum offloads */
cmd |= I40E_TX_DESC_CMD_L4T_EOFT_TCP;
offset |= l4.tcp->doff << I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT;
break;
case IPPROTO_SCTP:
/* enable SCTP checksum offload */
cmd |= I40E_TX_DESC_CMD_L4T_EOFT_SCTP;
offset |= (sizeof(struct sctphdr) >> 2) <<
I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT;
break;
case IPPROTO_UDP:
/* enable UDP checksum offload */
cmd |= I40E_TX_DESC_CMD_L4T_EOFT_UDP;
offset |= (sizeof(struct udphdr) >> 2) <<
I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT;
break;
default:
if (*tx_flags & I40E_TX_FLAGS_TSO)
return -1;
skb_checksum_help(skb);
return 0;
}
*td_cmd |= cmd;
*td_offset |= offset;
return 1;
}
/**
* i40e_create_tx_ctx Build the Tx context descriptor
* @tx_ring: ring to create the descriptor on
* @cd_type_cmd_tso_mss: Quad Word 1
* @cd_tunneling: Quad Word 0 - bits 0-31
* @cd_l2tag2: Quad Word 0 - bits 32-63
**/
static void i40e_create_tx_ctx(struct i40e_ring *tx_ring,
const u64 cd_type_cmd_tso_mss,
const u32 cd_tunneling, const u32 cd_l2tag2)
{
struct i40e_tx_context_desc *context_desc;
int i = tx_ring->next_to_use;
if ((cd_type_cmd_tso_mss == I40E_TX_DESC_DTYPE_CONTEXT) &&
!cd_tunneling && !cd_l2tag2)
return;
/* grab the next descriptor */
context_desc = I40E_TX_CTXTDESC(tx_ring, i);
i++;
tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;
/* cpu_to_le32 and assign to struct fields */
context_desc->tunneling_params = cpu_to_le32(cd_tunneling);
context_desc->l2tag2 = cpu_to_le16(cd_l2tag2);
context_desc->rsvd = cpu_to_le16(0);
context_desc->type_cmd_tso_mss = cpu_to_le64(cd_type_cmd_tso_mss);
}
/**
* __i40e_maybe_stop_tx - 2nd level check for tx stop conditions
* @tx_ring: the ring to be checked
* @size: the size buffer we want to assure is available
*
* Returns -EBUSY if a stop is needed, else 0
**/
int __i40e_maybe_stop_tx(struct i40e_ring *tx_ring, int size)
{
netif_stop_subqueue(tx_ring->netdev, tx_ring->queue_index);
/* Memory barrier before checking head and tail */
smp_mb();
/* Check again in a case another CPU has just made room available. */
if (likely(I40E_DESC_UNUSED(tx_ring) < size))
return -EBUSY;
/* A reprieve! - use start_queue because it doesn't call schedule */
netif_start_subqueue(tx_ring->netdev, tx_ring->queue_index);
++tx_ring->tx_stats.restart_queue;
return 0;
}
/**
* __i40e_chk_linearize - Check if there are more than 8 fragments per packet
* @skb: send buffer
*
* Note: Our HW can't scatter-gather more than 8 fragments to build
* a packet on the wire and so we need to figure out the cases where we
* need to linearize the skb.
**/
bool __i40e_chk_linearize(struct sk_buff *skb)
{
const struct skb_frag_struct *frag, *stale;
int gso_size, nr_frags, sum;
/* check to see if TSO is enabled, if so we may get a repreive */
gso_size = skb_shinfo(skb)->gso_size;
if (unlikely(!gso_size))
return true;
/* no need to check if number of frags is less than 8 */
nr_frags = skb_shinfo(skb)->nr_frags;
if (nr_frags < I40E_MAX_BUFFER_TXD)
return false;
/* We need to walk through the list and validate that each group
* of 6 fragments totals at least gso_size. However we don't need
* to perform such validation on the first or last 6 since the first
* 6 cannot inherit any data from a descriptor before them, and the
* last 6 cannot inherit any data from a descriptor after them.
*/
nr_frags -= I40E_MAX_BUFFER_TXD - 1;
frag = &skb_shinfo(skb)->frags[0];
/* Initialize size to the negative value of gso_size minus 1. We
* use this as the worst case scenerio in which the frag ahead
* of us only provides one byte which is why we are limited to 6
* descriptors for a single transmit as the header and previous
* fragment are already consuming 2 descriptors.
*/
sum = 1 - gso_size;
/* Add size of frags 1 through 5 to create our initial sum */
sum += skb_frag_size(++frag);
sum += skb_frag_size(++frag);
sum += skb_frag_size(++frag);
sum += skb_frag_size(++frag);
sum += skb_frag_size(++frag);
/* Walk through fragments adding latest fragment, testing it, and
* then removing stale fragments from the sum.
*/
stale = &skb_shinfo(skb)->frags[0];
for (;;) {
sum += skb_frag_size(++frag);
/* if sum is negative we failed to make sufficient progress */
if (sum < 0)
return true;
/* use pre-decrement to avoid processing last fragment */
if (!--nr_frags)
break;
sum -= skb_frag_size(++stale);
}
return false;
}
/**
* i40e_tx_map - Build the Tx descriptor
* @tx_ring: ring to send buffer on
* @skb: send buffer
* @first: first buffer info buffer to use
* @tx_flags: collected send information
* @hdr_len: size of the packet header
* @td_cmd: the command field in the descriptor
* @td_offset: offset for checksum or crc
**/
#ifdef I40E_FCOE
inline void i40e_tx_map(struct i40e_ring *tx_ring, struct sk_buff *skb,
struct i40e_tx_buffer *first, u32 tx_flags,
const u8 hdr_len, u32 td_cmd, u32 td_offset)
#else
static inline void i40e_tx_map(struct i40e_ring *tx_ring, struct sk_buff *skb,
struct i40e_tx_buffer *first, u32 tx_flags,
const u8 hdr_len, u32 td_cmd, u32 td_offset)
#endif
{
unsigned int data_len = skb->data_len;
unsigned int size = skb_headlen(skb);
struct skb_frag_struct *frag;
struct i40e_tx_buffer *tx_bi;
struct i40e_tx_desc *tx_desc;
u16 i = tx_ring->next_to_use;
u32 td_tag = 0;
dma_addr_t dma;
u16 gso_segs;
u16 desc_count = 0;
bool tail_bump = true;
bool do_rs = false;
if (tx_flags & I40E_TX_FLAGS_HW_VLAN) {
td_cmd |= I40E_TX_DESC_CMD_IL2TAG1;
td_tag = (tx_flags & I40E_TX_FLAGS_VLAN_MASK) >>
I40E_TX_FLAGS_VLAN_SHIFT;
}
if (tx_flags & (I40E_TX_FLAGS_TSO | I40E_TX_FLAGS_FSO))
gso_segs = skb_shinfo(skb)->gso_segs;
else
gso_segs = 1;
/* multiply data chunks by size of headers */
first->bytecount = skb->len - hdr_len + (gso_segs * hdr_len);
first->gso_segs = gso_segs;
first->skb = skb;
first->tx_flags = tx_flags;
dma = dma_map_single(tx_ring->dev, skb->data, size, DMA_TO_DEVICE);
tx_desc = I40E_TX_DESC(tx_ring, i);
tx_bi = first;
for (frag = &skb_shinfo(skb)->frags[0];; frag++) {
unsigned int max_data = I40E_MAX_DATA_PER_TXD_ALIGNED;
if (dma_mapping_error(tx_ring->dev, dma))
goto dma_error;
/* record length, and DMA address */
dma_unmap_len_set(tx_bi, len, size);
dma_unmap_addr_set(tx_bi, dma, dma);
/* align size to end of page */
max_data += -dma & (I40E_MAX_READ_REQ_SIZE - 1);
tx_desc->buffer_addr = cpu_to_le64(dma);
while (unlikely(size > I40E_MAX_DATA_PER_TXD)) {
tx_desc->cmd_type_offset_bsz =
build_ctob(td_cmd, td_offset,
max_data, td_tag);
tx_desc++;
i++;
desc_count++;
if (i == tx_ring->count) {
tx_desc = I40E_TX_DESC(tx_ring, 0);
i = 0;
}
dma += max_data;
size -= max_data;
max_data = I40E_MAX_DATA_PER_TXD_ALIGNED;
tx_desc->buffer_addr = cpu_to_le64(dma);
}
if (likely(!data_len))
break;
tx_desc->cmd_type_offset_bsz = build_ctob(td_cmd, td_offset,
size, td_tag);
tx_desc++;
i++;
desc_count++;
if (i == tx_ring->count) {
tx_desc = I40E_TX_DESC(tx_ring, 0);
i = 0;
}
size = skb_frag_size(frag);
data_len -= size;
dma = skb_frag_dma_map(tx_ring->dev, frag, 0, size,
DMA_TO_DEVICE);
tx_bi = &tx_ring->tx_bi[i];
}
/* set next_to_watch value indicating a packet is present */
first->next_to_watch = tx_desc;
i++;
if (i == tx_ring->count)
i = 0;
tx_ring->next_to_use = i;
netdev_tx_sent_queue(netdev_get_tx_queue(tx_ring->netdev,
tx_ring->queue_index),
first->bytecount);
i40e_maybe_stop_tx(tx_ring, DESC_NEEDED);
/* Algorithm to optimize tail and RS bit setting:
* if xmit_more is supported
* if xmit_more is true
* do not update tail and do not mark RS bit.
* if xmit_more is false and last xmit_more was false
* if every packet spanned less than 4 desc
* then set RS bit on 4th packet and update tail
* on every packet
* else
* update tail and set RS bit on every packet.
* if xmit_more is false and last_xmit_more was true
* update tail and set RS bit.
*
* Optimization: wmb to be issued only in case of tail update.
* Also optimize the Descriptor WB path for RS bit with the same
* algorithm.
*
* Note: If there are less than 4 packets
* pending and interrupts were disabled the service task will
* trigger a force WB.
*/
if (skb->xmit_more &&
!netif_xmit_stopped(netdev_get_tx_queue(tx_ring->netdev,
tx_ring->queue_index))) {
tx_ring->flags |= I40E_TXR_FLAGS_LAST_XMIT_MORE_SET;
tail_bump = false;
} else if (!skb->xmit_more &&
!netif_xmit_stopped(netdev_get_tx_queue(tx_ring->netdev,
tx_ring->queue_index)) &&
(!(tx_ring->flags & I40E_TXR_FLAGS_LAST_XMIT_MORE_SET)) &&
(tx_ring->packet_stride < WB_STRIDE) &&
(desc_count < WB_STRIDE)) {
tx_ring->packet_stride++;
} else {
tx_ring->packet_stride = 0;
tx_ring->flags &= ~I40E_TXR_FLAGS_LAST_XMIT_MORE_SET;
do_rs = true;
}
if (do_rs)
tx_ring->packet_stride = 0;
tx_desc->cmd_type_offset_bsz =
build_ctob(td_cmd, td_offset, size, td_tag) |
cpu_to_le64((u64)(do_rs ? I40E_TXD_CMD :
I40E_TX_DESC_CMD_EOP) <<
I40E_TXD_QW1_CMD_SHIFT);
/* notify HW of packet */
if (!tail_bump)
prefetchw(tx_desc + 1);
if (tail_bump) {
/* Force memory writes to complete before letting h/w
* know there are new descriptors to fetch. (Only
* applicable for weak-ordered memory model archs,
* such as IA-64).
*/
wmb();
writel(i, tx_ring->tail);
}
return;
dma_error:
dev_info(tx_ring->dev, "TX DMA map failed\n");
/* clear dma mappings for failed tx_bi map */
for (;;) {
tx_bi = &tx_ring->tx_bi[i];
i40e_unmap_and_free_tx_resource(tx_ring, tx_bi);
if (tx_bi == first)
break;
if (i == 0)
i = tx_ring->count;
i--;
}
tx_ring->next_to_use = i;
}
/**
* i40e_xmit_frame_ring - Sends buffer on Tx ring
* @skb: send buffer
* @tx_ring: ring to send buffer on
*
* Returns NETDEV_TX_OK if sent, else an error code
**/
static netdev_tx_t i40e_xmit_frame_ring(struct sk_buff *skb,
struct i40e_ring *tx_ring)
{
u64 cd_type_cmd_tso_mss = I40E_TX_DESC_DTYPE_CONTEXT;
u32 cd_tunneling = 0, cd_l2tag2 = 0;
struct i40e_tx_buffer *first;
u32 td_offset = 0;
u32 tx_flags = 0;
__be16 protocol;
u32 td_cmd = 0;
u8 hdr_len = 0;
int tso, count;
int tsyn;
/* prefetch the data, we'll need it later */
prefetch(skb->data);
count = i40e_xmit_descriptor_count(skb);
if (i40e_chk_linearize(skb, count)) {
if (__skb_linearize(skb))
goto out_drop;
count = i40e_txd_use_count(skb->len);
tx_ring->tx_stats.tx_linearize++;
}
/* need: 1 descriptor per page * PAGE_SIZE/I40E_MAX_DATA_PER_TXD,
* + 1 desc for skb_head_len/I40E_MAX_DATA_PER_TXD,
* + 4 desc gap to avoid the cache line where head is,
* + 1 desc for context descriptor,
* otherwise try next time
*/
if (i40e_maybe_stop_tx(tx_ring, count + 4 + 1)) {
tx_ring->tx_stats.tx_busy++;
return NETDEV_TX_BUSY;
}
/* prepare the xmit flags */
if (i40e_tx_prepare_vlan_flags(skb, tx_ring, &tx_flags))
goto out_drop;
/* obtain protocol of skb */
protocol = vlan_get_protocol(skb);
/* record the location of the first descriptor for this packet */
first = &tx_ring->tx_bi[tx_ring->next_to_use];
/* setup IPv4/IPv6 offloads */
if (protocol == htons(ETH_P_IP))
tx_flags |= I40E_TX_FLAGS_IPV4;
else if (protocol == htons(ETH_P_IPV6))
tx_flags |= I40E_TX_FLAGS_IPV6;
tso = i40e_tso(skb, &hdr_len, &cd_type_cmd_tso_mss);
if (tso < 0)
goto out_drop;
else if (tso)
tx_flags |= I40E_TX_FLAGS_TSO;
/* Always offload the checksum, since it's in the data descriptor */
tso = i40e_tx_enable_csum(skb, &tx_flags, &td_cmd, &td_offset,
tx_ring, &cd_tunneling);
if (tso < 0)
goto out_drop;
tsyn = i40e_tsyn(tx_ring, skb, tx_flags, &cd_type_cmd_tso_mss);
if (tsyn)
tx_flags |= I40E_TX_FLAGS_TSYN;
skb_tx_timestamp(skb);
/* always enable CRC insertion offload */
td_cmd |= I40E_TX_DESC_CMD_ICRC;
i40e_create_tx_ctx(tx_ring, cd_type_cmd_tso_mss,
cd_tunneling, cd_l2tag2);
/* Add Flow Director ATR if it's enabled.
*
* NOTE: this must always be directly before the data descriptor.
*/
i40e_atr(tx_ring, skb, tx_flags);
i40e_tx_map(tx_ring, skb, first, tx_flags, hdr_len,
td_cmd, td_offset);
return NETDEV_TX_OK;
out_drop:
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
/**
* i40e_lan_xmit_frame - Selects the correct VSI and Tx queue to send buffer
* @skb: send buffer
* @netdev: network interface device structure
*
* Returns NETDEV_TX_OK if sent, else an error code
**/
netdev_tx_t i40e_lan_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
{
struct i40e_netdev_priv *np = netdev_priv(netdev);
struct i40e_vsi *vsi = np->vsi;
struct i40e_ring *tx_ring = vsi->tx_rings[skb->queue_mapping];
/* hardware can't handle really short frames, hardware padding works
* beyond this point
*/
if (skb_put_padto(skb, I40E_MIN_TX_LEN))
return NETDEV_TX_OK;
return i40e_xmit_frame_ring(skb, tx_ring);
}
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