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ionic_txrx.c
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ionic_txrx.c
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// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2017 - 2019 Pensando Systems, Inc */
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/if_vlan.h>
#include <net/ip6_checksum.h>
#include "ionic.h"
#include "ionic_lif.h"
#include "ionic_txrx.h"
static void ionic_rx_clean(struct ionic_queue *q,
struct ionic_desc_info *desc_info,
struct ionic_cq_info *cq_info,
void *cb_arg);
static bool ionic_rx_service(struct ionic_cq *cq, struct ionic_cq_info *cq_info);
static bool ionic_tx_service(struct ionic_cq *cq, struct ionic_cq_info *cq_info);
static inline void ionic_txq_post(struct ionic_queue *q, bool ring_dbell,
ionic_desc_cb cb_func, void *cb_arg)
{
DEBUG_STATS_TXQ_POST(q_to_qcq(q), q->head->desc, ring_dbell);
ionic_q_post(q, ring_dbell, cb_func, cb_arg);
}
static inline void ionic_rxq_post(struct ionic_queue *q, bool ring_dbell,
ionic_desc_cb cb_func, void *cb_arg)
{
ionic_q_post(q, ring_dbell, cb_func, cb_arg);
DEBUG_STATS_RX_BUFF_CNT(q_to_qcq(q));
}
static inline struct netdev_queue *q_to_ndq(struct ionic_queue *q)
{
return netdev_get_tx_queue(q->lif->netdev, q->index);
}
static struct sk_buff *ionic_rx_skb_alloc(struct ionic_queue *q,
unsigned int len, bool frags)
{
struct ionic_lif *lif = q->lif;
struct ionic_rx_stats *stats;
struct net_device *netdev;
struct sk_buff *skb;
netdev = lif->netdev;
stats = q_to_rx_stats(q);
if (frags)
skb = napi_get_frags(&q_to_qcq(q)->napi);
else
skb = netdev_alloc_skb_ip_align(netdev, len);
if (unlikely(!skb)) {
net_warn_ratelimited("%s: SKB alloc failed on %s!\n",
netdev->name, q->name);
stats->alloc_err++;
return NULL;
}
return skb;
}
static struct sk_buff *ionic_rx_frags(struct ionic_queue *q,
struct ionic_desc_info *desc_info,
struct ionic_cq_info *cq_info)
{
struct ionic_rxq_comp *comp = cq_info->cq_desc;
struct device *dev = q->lif->ionic->dev;
struct ionic_page_info *page_info;
struct sk_buff *skb;
unsigned int i;
u16 frag_len;
u16 len;
page_info = &desc_info->pages[0];
len = le16_to_cpu(comp->len);
prefetch(page_address(page_info->page) + NET_IP_ALIGN);
skb = ionic_rx_skb_alloc(q, len, true);
if (unlikely(!skb))
return NULL;
i = comp->num_sg_elems + 1;
do {
if (unlikely(!page_info->page)) {
struct napi_struct *napi = &q_to_qcq(q)->napi;
napi->skb = NULL;
dev_kfree_skb(skb);
return NULL;
}
frag_len = min(len, (u16)PAGE_SIZE);
len -= frag_len;
dma_unmap_page(dev, dma_unmap_addr(page_info, dma_addr),
PAGE_SIZE, DMA_FROM_DEVICE);
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
page_info->page, 0, frag_len, PAGE_SIZE);
page_info->page = NULL;
page_info++;
i--;
} while (i > 0);
return skb;
}
static struct sk_buff *ionic_rx_copybreak(struct ionic_queue *q,
struct ionic_desc_info *desc_info,
struct ionic_cq_info *cq_info)
{
struct ionic_rxq_comp *comp = cq_info->cq_desc;
struct device *dev = q->lif->ionic->dev;
struct ionic_page_info *page_info;
struct sk_buff *skb;
u16 len;
page_info = &desc_info->pages[0];
len = le16_to_cpu(comp->len);
skb = ionic_rx_skb_alloc(q, len, false);
if (unlikely(!skb))
return NULL;
if (unlikely(!page_info->page)) {
dev_kfree_skb(skb);
return NULL;
}
dma_sync_single_for_cpu(dev, dma_unmap_addr(page_info, dma_addr),
len, DMA_FROM_DEVICE);
skb_copy_to_linear_data(skb, page_address(page_info->page), len);
dma_sync_single_for_device(dev, dma_unmap_addr(page_info, dma_addr),
len, DMA_FROM_DEVICE);
skb_put(skb, len);
skb->protocol = eth_type_trans(skb, q->lif->netdev);
return skb;
}
static void ionic_rx_clean(struct ionic_queue *q,
struct ionic_desc_info *desc_info,
struct ionic_cq_info *cq_info,
void *cb_arg)
{
struct ionic_rxq_comp *comp = cq_info->cq_desc;
struct ionic_qcq *qcq = q_to_qcq(q);
struct ionic_rx_stats *stats;
struct net_device *netdev;
struct sk_buff *skb;
stats = q_to_rx_stats(q);
netdev = q->lif->netdev;
if (comp->status) {
stats->dropped++;
return;
}
stats->pkts++;
stats->bytes += le16_to_cpu(comp->len);
if (le16_to_cpu(comp->len) <= q->lif->rx_copybreak)
skb = ionic_rx_copybreak(q, desc_info, cq_info);
else
skb = ionic_rx_frags(q, desc_info, cq_info);
if (unlikely(!skb)) {
stats->dropped++;
return;
}
skb_record_rx_queue(skb, q->index);
if (likely(netdev->features & NETIF_F_RXHASH)) {
switch (comp->pkt_type_color & IONIC_RXQ_COMP_PKT_TYPE_MASK) {
case IONIC_PKT_TYPE_IPV4:
case IONIC_PKT_TYPE_IPV6:
skb_set_hash(skb, le32_to_cpu(comp->rss_hash),
PKT_HASH_TYPE_L3);
break;
case IONIC_PKT_TYPE_IPV4_TCP:
case IONIC_PKT_TYPE_IPV6_TCP:
case IONIC_PKT_TYPE_IPV4_UDP:
case IONIC_PKT_TYPE_IPV6_UDP:
skb_set_hash(skb, le32_to_cpu(comp->rss_hash),
PKT_HASH_TYPE_L4);
break;
}
}
if (likely(netdev->features & NETIF_F_RXCSUM)) {
if (comp->csum_flags & IONIC_RXQ_COMP_CSUM_F_CALC) {
skb->ip_summed = CHECKSUM_COMPLETE;
skb->csum = (__wsum)le16_to_cpu(comp->csum);
stats->csum_complete++;
}
} else {
stats->csum_none++;
}
if (unlikely((comp->csum_flags & IONIC_RXQ_COMP_CSUM_F_TCP_BAD) ||
(comp->csum_flags & IONIC_RXQ_COMP_CSUM_F_UDP_BAD) ||
(comp->csum_flags & IONIC_RXQ_COMP_CSUM_F_IP_BAD)))
stats->csum_error++;
if (likely(netdev->features & NETIF_F_HW_VLAN_CTAG_RX) &&
(comp->csum_flags & IONIC_RXQ_COMP_CSUM_F_VLAN)) {
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
le16_to_cpu(comp->vlan_tci));
stats->vlan_stripped++;
}
if (le16_to_cpu(comp->len) <= q->lif->rx_copybreak)
napi_gro_receive(&qcq->napi, skb);
else
napi_gro_frags(&qcq->napi);
}
static bool ionic_rx_service(struct ionic_cq *cq, struct ionic_cq_info *cq_info)
{
struct ionic_rxq_comp *comp = cq_info->cq_desc;
struct ionic_queue *q = cq->bound_q;
struct ionic_desc_info *desc_info;
if (!color_match(comp->pkt_type_color, cq->done_color))
return false;
/* check for empty queue */
if (q->tail->index == q->head->index)
return false;
desc_info = q->tail;
if (desc_info->index != le16_to_cpu(comp->comp_index))
return false;
q->tail = desc_info->next;
/* clean the related q entry, only one per qc completion */
ionic_rx_clean(q, desc_info, cq_info, desc_info->cb_arg);
desc_info->cb = NULL;
desc_info->cb_arg = NULL;
return true;
}
static struct page *ionic_rx_page_alloc(struct ionic_queue *q,
dma_addr_t *dma_addr)
{
struct ionic_lif *lif = q->lif;
struct ionic_rx_stats *stats;
struct net_device *netdev;
struct device *dev;
struct page *page;
netdev = lif->netdev;
dev = lif->ionic->dev;
stats = q_to_rx_stats(q);
page = alloc_page(GFP_ATOMIC);
if (unlikely(!page)) {
net_err_ratelimited("%s: Page alloc failed on %s!\n",
netdev->name, q->name);
stats->alloc_err++;
return NULL;
}
*dma_addr = dma_map_page(dev, page, 0, PAGE_SIZE, DMA_FROM_DEVICE);
if (unlikely(dma_mapping_error(dev, *dma_addr))) {
__free_page(page);
net_err_ratelimited("%s: DMA single map failed on %s!\n",
netdev->name, q->name);
stats->dma_map_err++;
return NULL;
}
return page;
}
static void ionic_rx_page_free(struct ionic_queue *q, struct page *page,
dma_addr_t dma_addr)
{
struct ionic_lif *lif = q->lif;
struct net_device *netdev;
struct device *dev;
netdev = lif->netdev;
dev = lif->ionic->dev;
if (unlikely(!page)) {
net_err_ratelimited("%s: Trying to free unallocated buffer on %s!\n",
netdev->name, q->name);
return;
}
dma_unmap_page(dev, dma_addr, PAGE_SIZE, DMA_FROM_DEVICE);
__free_page(page);
}
void ionic_rx_fill(struct ionic_queue *q)
{
struct net_device *netdev = q->lif->netdev;
struct ionic_desc_info *desc_info;
struct ionic_page_info *page_info;
struct ionic_rxq_sg_desc *sg_desc;
struct ionic_rxq_sg_elem *sg_elem;
struct ionic_rxq_desc *desc;
unsigned int remain_len;
unsigned int seg_len;
unsigned int nfrags;
unsigned int i, j;
unsigned int len;
len = netdev->mtu + ETH_HLEN;
nfrags = round_up(len, PAGE_SIZE) / PAGE_SIZE;
for (i = ionic_q_space_avail(q); i; i--) {
remain_len = len;
desc_info = q->head;
desc = desc_info->desc;
sg_desc = desc_info->sg_desc;
page_info = &desc_info->pages[0];
if (page_info->page) { /* recycle the buffer */
ionic_rxq_post(q, false, ionic_rx_clean, NULL);
continue;
}
/* fill main descriptor - pages[0] */
desc->opcode = (nfrags > 1) ? IONIC_RXQ_DESC_OPCODE_SG :
IONIC_RXQ_DESC_OPCODE_SIMPLE;
desc_info->npages = nfrags;
page_info->page = ionic_rx_page_alloc(q, &page_info->dma_addr);
if (unlikely(!page_info->page)) {
desc->addr = 0;
desc->len = 0;
return;
}
desc->addr = cpu_to_le64(page_info->dma_addr);
seg_len = min_t(unsigned int, PAGE_SIZE, len);
desc->len = cpu_to_le16(seg_len);
remain_len -= seg_len;
page_info++;
/* fill sg descriptors - pages[1..n] */
for (j = 0; j < nfrags - 1; j++) {
if (page_info->page) /* recycle the sg buffer */
continue;
sg_elem = &sg_desc->elems[j];
page_info->page = ionic_rx_page_alloc(q, &page_info->dma_addr);
if (unlikely(!page_info->page)) {
sg_elem->addr = 0;
sg_elem->len = 0;
return;
}
sg_elem->addr = cpu_to_le64(page_info->dma_addr);
seg_len = min_t(unsigned int, PAGE_SIZE, remain_len);
sg_elem->len = cpu_to_le16(seg_len);
remain_len -= seg_len;
page_info++;
}
ionic_rxq_post(q, false, ionic_rx_clean, NULL);
}
ionic_dbell_ring(q->lif->kern_dbpage, q->hw_type,
q->dbval | q->head->index);
}
static void ionic_rx_fill_cb(void *arg)
{
ionic_rx_fill(arg);
}
void ionic_rx_empty(struct ionic_queue *q)
{
struct ionic_desc_info *cur;
struct ionic_rxq_desc *desc;
unsigned int i;
for (cur = q->tail; cur != q->head; cur = cur->next) {
desc = cur->desc;
desc->addr = 0;
desc->len = 0;
for (i = 0; i < cur->npages; i++) {
if (likely(cur->pages[i].page)) {
ionic_rx_page_free(q, cur->pages[i].page,
cur->pages[i].dma_addr);
cur->pages[i].page = NULL;
cur->pages[i].dma_addr = 0;
}
}
cur->cb_arg = NULL;
}
}
int ionic_tx_napi(struct napi_struct *napi, int budget)
{
struct ionic_qcq *qcq = napi_to_qcq(napi);
struct ionic_cq *cq = napi_to_cq(napi);
struct ionic_dev *idev;
struct ionic_lif *lif;
u32 work_done = 0;
u32 flags = 0;
lif = cq->bound_q->lif;
idev = &lif->ionic->idev;
work_done = ionic_cq_service(cq, budget,
ionic_tx_service, NULL, NULL);
if (work_done < budget && napi_complete_done(napi, work_done)) {
flags |= IONIC_INTR_CRED_UNMASK;
DEBUG_STATS_INTR_REARM(cq->bound_intr);
}
if (work_done || flags) {
flags |= IONIC_INTR_CRED_RESET_COALESCE;
ionic_intr_credits(idev->intr_ctrl,
cq->bound_intr->index,
work_done, flags);
}
DEBUG_STATS_NAPI_POLL(qcq, work_done);
return work_done;
}
int ionic_rx_napi(struct napi_struct *napi, int budget)
{
struct ionic_qcq *qcq = napi_to_qcq(napi);
struct ionic_cq *cq = napi_to_cq(napi);
struct ionic_dev *idev;
struct ionic_lif *lif;
u32 work_done = 0;
u32 flags = 0;
lif = cq->bound_q->lif;
idev = &lif->ionic->idev;
work_done = ionic_cq_service(cq, budget,
ionic_rx_service, NULL, NULL);
if (work_done)
ionic_rx_fill(cq->bound_q);
if (work_done < budget && napi_complete_done(napi, work_done)) {
flags |= IONIC_INTR_CRED_UNMASK;
DEBUG_STATS_INTR_REARM(cq->bound_intr);
}
if (work_done || flags) {
flags |= IONIC_INTR_CRED_RESET_COALESCE;
ionic_intr_credits(idev->intr_ctrl,
cq->bound_intr->index,
work_done, flags);
}
DEBUG_STATS_NAPI_POLL(qcq, work_done);
return work_done;
}
int ionic_txrx_napi(struct napi_struct *napi, int budget)
{
struct ionic_qcq *qcq = napi_to_qcq(napi);
struct ionic_cq *rxcq = napi_to_cq(napi);
unsigned int qi = rxcq->bound_q->index;
struct ionic_dev *idev;
struct ionic_lif *lif;
struct ionic_cq *txcq;
u32 rx_work_done = 0;
u32 tx_work_done = 0;
u32 flags = 0;
lif = rxcq->bound_q->lif;
idev = &lif->ionic->idev;
txcq = &lif->txqcqs[qi].qcq->cq;
tx_work_done = ionic_cq_service(txcq, lif->tx_budget,
ionic_tx_service, NULL, NULL);
rx_work_done = ionic_cq_service(rxcq, budget,
ionic_rx_service, NULL, NULL);
if (rx_work_done)
ionic_rx_fill_cb(rxcq->bound_q);
if (rx_work_done < budget && napi_complete_done(napi, rx_work_done)) {
flags |= IONIC_INTR_CRED_UNMASK;
DEBUG_STATS_INTR_REARM(rxcq->bound_intr);
}
if (rx_work_done || flags) {
flags |= IONIC_INTR_CRED_RESET_COALESCE;
ionic_intr_credits(idev->intr_ctrl, rxcq->bound_intr->index,
tx_work_done + rx_work_done, flags);
}
DEBUG_STATS_NAPI_POLL(qcq, rx_work_done);
DEBUG_STATS_NAPI_POLL(qcq, tx_work_done);
return rx_work_done;
}
static dma_addr_t ionic_tx_map_single(struct ionic_queue *q,
void *data, size_t len)
{
struct ionic_tx_stats *stats = q_to_tx_stats(q);
struct device *dev = q->lif->ionic->dev;
dma_addr_t dma_addr;
dma_addr = dma_map_single(dev, data, len, DMA_TO_DEVICE);
if (dma_mapping_error(dev, dma_addr)) {
net_warn_ratelimited("%s: DMA single map failed on %s!\n",
q->lif->netdev->name, q->name);
stats->dma_map_err++;
return 0;
}
return dma_addr;
}
static dma_addr_t ionic_tx_map_frag(struct ionic_queue *q,
const skb_frag_t *frag,
size_t offset, size_t len)
{
struct ionic_tx_stats *stats = q_to_tx_stats(q);
struct device *dev = q->lif->ionic->dev;
dma_addr_t dma_addr;
dma_addr = skb_frag_dma_map(dev, frag, offset, len, DMA_TO_DEVICE);
if (dma_mapping_error(dev, dma_addr)) {
net_warn_ratelimited("%s: DMA frag map failed on %s!\n",
q->lif->netdev->name, q->name);
stats->dma_map_err++;
}
return dma_addr;
}
static void ionic_tx_clean(struct ionic_queue *q,
struct ionic_desc_info *desc_info,
struct ionic_cq_info *cq_info,
void *cb_arg)
{
struct ionic_txq_sg_desc *sg_desc = desc_info->sg_desc;
struct ionic_txq_sg_elem *elem = sg_desc->elems;
struct ionic_tx_stats *stats = q_to_tx_stats(q);
struct ionic_txq_desc *desc = desc_info->desc;
struct device *dev = q->lif->ionic->dev;
u8 opcode, flags, nsge;
u16 queue_index;
unsigned int i;
u64 addr;
decode_txq_desc_cmd(le64_to_cpu(desc->cmd),
&opcode, &flags, &nsge, &addr);
/* use unmap_single only if either this is not TSO,
* or this is first descriptor of a TSO
*/
if (opcode != IONIC_TXQ_DESC_OPCODE_TSO ||
flags & IONIC_TXQ_DESC_FLAG_TSO_SOT)
dma_unmap_single(dev, (dma_addr_t)addr,
le16_to_cpu(desc->len), DMA_TO_DEVICE);
else
dma_unmap_page(dev, (dma_addr_t)addr,
le16_to_cpu(desc->len), DMA_TO_DEVICE);
for (i = 0; i < nsge; i++, elem++)
dma_unmap_page(dev, (dma_addr_t)le64_to_cpu(elem->addr),
le16_to_cpu(elem->len), DMA_TO_DEVICE);
if (cb_arg) {
struct sk_buff *skb = cb_arg;
u32 len = skb->len;
queue_index = skb_get_queue_mapping(skb);
if (unlikely(__netif_subqueue_stopped(q->lif->netdev,
queue_index))) {
netif_wake_subqueue(q->lif->netdev, queue_index);
q->wake++;
}
dev_kfree_skb_any(skb);
stats->clean++;
netdev_tx_completed_queue(q_to_ndq(q), 1, len);
}
}
static bool ionic_tx_service(struct ionic_cq *cq, struct ionic_cq_info *cq_info)
{
struct ionic_txq_comp *comp = cq_info->cq_desc;
struct ionic_queue *q = cq->bound_q;
struct ionic_desc_info *desc_info;
if (!color_match(comp->color, cq->done_color))
return false;
/* clean the related q entries, there could be
* several q entries completed for each cq completion
*/
do {
desc_info = q->tail;
q->tail = desc_info->next;
ionic_tx_clean(q, desc_info, cq->tail, desc_info->cb_arg);
desc_info->cb = NULL;
desc_info->cb_arg = NULL;
} while (desc_info->index != le16_to_cpu(comp->comp_index));
return true;
}
void ionic_tx_flush(struct ionic_cq *cq)
{
struct ionic_dev *idev = &cq->lif->ionic->idev;
u32 work_done;
work_done = ionic_cq_service(cq, cq->num_descs,
ionic_tx_service, NULL, NULL);
if (work_done)
ionic_intr_credits(idev->intr_ctrl, cq->bound_intr->index,
work_done, IONIC_INTR_CRED_RESET_COALESCE);
}
void ionic_tx_empty(struct ionic_queue *q)
{
struct ionic_desc_info *desc_info;
int done = 0;
/* walk the not completed tx entries, if any */
while (q->head != q->tail) {
desc_info = q->tail;
q->tail = desc_info->next;
ionic_tx_clean(q, desc_info, NULL, desc_info->cb_arg);
desc_info->cb = NULL;
desc_info->cb_arg = NULL;
done++;
}
}
static int ionic_tx_tcp_inner_pseudo_csum(struct sk_buff *skb)
{
int err;
err = skb_cow_head(skb, 0);
if (err)
return err;
if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
inner_ip_hdr(skb)->check = 0;
inner_tcp_hdr(skb)->check =
~csum_tcpudp_magic(inner_ip_hdr(skb)->saddr,
inner_ip_hdr(skb)->daddr,
0, IPPROTO_TCP, 0);
} else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) {
inner_tcp_hdr(skb)->check =
~csum_ipv6_magic(&inner_ipv6_hdr(skb)->saddr,
&inner_ipv6_hdr(skb)->daddr,
0, IPPROTO_TCP, 0);
}
return 0;
}
static int ionic_tx_tcp_pseudo_csum(struct sk_buff *skb)
{
int err;
err = skb_cow_head(skb, 0);
if (err)
return err;
if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
ip_hdr(skb)->check = 0;
tcp_hdr(skb)->check =
~csum_tcpudp_magic(ip_hdr(skb)->saddr,
ip_hdr(skb)->daddr,
0, IPPROTO_TCP, 0);
} else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) {
tcp_v6_gso_csum_prep(skb);
}
return 0;
}
static void ionic_tx_tso_post(struct ionic_queue *q, struct ionic_txq_desc *desc,
struct sk_buff *skb,
dma_addr_t addr, u8 nsge, u16 len,
unsigned int hdrlen, unsigned int mss,
bool outer_csum,
u16 vlan_tci, bool has_vlan,
bool start, bool done)
{
u8 flags = 0;
u64 cmd;
flags |= has_vlan ? IONIC_TXQ_DESC_FLAG_VLAN : 0;
flags |= outer_csum ? IONIC_TXQ_DESC_FLAG_ENCAP : 0;
flags |= start ? IONIC_TXQ_DESC_FLAG_TSO_SOT : 0;
flags |= done ? IONIC_TXQ_DESC_FLAG_TSO_EOT : 0;
cmd = encode_txq_desc_cmd(IONIC_TXQ_DESC_OPCODE_TSO, flags, nsge, addr);
desc->cmd = cpu_to_le64(cmd);
desc->len = cpu_to_le16(len);
desc->vlan_tci = cpu_to_le16(vlan_tci);
desc->hdr_len = cpu_to_le16(hdrlen);
desc->mss = cpu_to_le16(mss);
if (done) {
skb_tx_timestamp(skb);
netdev_tx_sent_queue(q_to_ndq(q), skb->len);
ionic_txq_post(q, !netdev_xmit_more(), ionic_tx_clean, skb);
} else {
ionic_txq_post(q, false, ionic_tx_clean, NULL);
}
}
static struct ionic_txq_desc *ionic_tx_tso_next(struct ionic_queue *q,
struct ionic_txq_sg_elem **elem)
{
struct ionic_txq_sg_desc *sg_desc = q->head->sg_desc;
struct ionic_txq_desc *desc = q->head->desc;
*elem = sg_desc->elems;
return desc;
}
static int ionic_tx_tso(struct ionic_queue *q, struct sk_buff *skb)
{
struct ionic_tx_stats *stats = q_to_tx_stats(q);
struct ionic_desc_info *abort = q->head;
struct device *dev = q->lif->ionic->dev;
struct ionic_desc_info *rewind = abort;
struct ionic_txq_sg_elem *elem;
struct ionic_txq_desc *desc;
unsigned int frag_left = 0;
unsigned int offset = 0;
unsigned int len_left;
dma_addr_t desc_addr;
unsigned int hdrlen;
unsigned int nfrags;
unsigned int seglen;
u64 total_bytes = 0;
u64 total_pkts = 0;
unsigned int left;
unsigned int len;
unsigned int mss;
skb_frag_t *frag;
bool start, done;
bool outer_csum;
bool has_vlan;
u16 desc_len;
u8 desc_nsge;
u16 vlan_tci;
bool encap;
int err;
mss = skb_shinfo(skb)->gso_size;
nfrags = skb_shinfo(skb)->nr_frags;
len_left = skb->len - skb_headlen(skb);
outer_csum = (skb_shinfo(skb)->gso_type & SKB_GSO_GRE_CSUM) ||
(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM);
has_vlan = !!skb_vlan_tag_present(skb);
vlan_tci = skb_vlan_tag_get(skb);
encap = skb->encapsulation;
/* Preload inner-most TCP csum field with IP pseudo hdr
* calculated with IP length set to zero. HW will later
* add in length to each TCP segment resulting from the TSO.
*/
if (encap)
err = ionic_tx_tcp_inner_pseudo_csum(skb);
else
err = ionic_tx_tcp_pseudo_csum(skb);
if (err)
return err;
if (encap)
hdrlen = skb_inner_transport_header(skb) - skb->data +
inner_tcp_hdrlen(skb);
else
hdrlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
seglen = hdrlen + mss;
left = skb_headlen(skb);
desc = ionic_tx_tso_next(q, &elem);
start = true;
/* Chop skb->data up into desc segments */
while (left > 0) {
len = min(seglen, left);
frag_left = seglen - len;
desc_addr = ionic_tx_map_single(q, skb->data + offset, len);
if (dma_mapping_error(dev, desc_addr))
goto err_out_abort;
desc_len = len;
desc_nsge = 0;
left -= len;
offset += len;
if (nfrags > 0 && frag_left > 0)
continue;
done = (nfrags == 0 && left == 0);
ionic_tx_tso_post(q, desc, skb,
desc_addr, desc_nsge, desc_len,
hdrlen, mss,
outer_csum,
vlan_tci, has_vlan,
start, done);
total_pkts++;
total_bytes += start ? len : len + hdrlen;
desc = ionic_tx_tso_next(q, &elem);
start = false;
seglen = mss;
}
/* Chop skb frags into desc segments */
for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
offset = 0;
left = skb_frag_size(frag);
len_left -= left;
nfrags--;
stats->frags++;
while (left > 0) {
if (frag_left > 0) {
len = min(frag_left, left);
frag_left -= len;
elem->addr =
cpu_to_le64(ionic_tx_map_frag(q, frag,
offset, len));
if (dma_mapping_error(dev, elem->addr))
goto err_out_abort;
elem->len = cpu_to_le16(len);
elem++;
desc_nsge++;
left -= len;
offset += len;
if (nfrags > 0 && frag_left > 0)
continue;
done = (nfrags == 0 && left == 0);
ionic_tx_tso_post(q, desc, skb, desc_addr,
desc_nsge, desc_len,
hdrlen, mss, outer_csum,
vlan_tci, has_vlan,
start, done);
total_pkts++;
total_bytes += start ? len : len + hdrlen;
desc = ionic_tx_tso_next(q, &elem);
start = false;
} else {
len = min(mss, left);
frag_left = mss - len;
desc_addr = ionic_tx_map_frag(q, frag,
offset, len);
if (dma_mapping_error(dev, desc_addr))
goto err_out_abort;
desc_len = len;
desc_nsge = 0;
left -= len;
offset += len;
if (nfrags > 0 && frag_left > 0)
continue;
done = (nfrags == 0 && left == 0);
ionic_tx_tso_post(q, desc, skb, desc_addr,
desc_nsge, desc_len,
hdrlen, mss, outer_csum,
vlan_tci, has_vlan,
start, done);
total_pkts++;
total_bytes += start ? len : len + hdrlen;
desc = ionic_tx_tso_next(q, &elem);
start = false;
}
}
}
stats->pkts += total_pkts;
stats->bytes += total_bytes;
stats->tso++;
stats->tso_bytes += total_bytes;
return 0;
err_out_abort:
while (rewind->desc != q->head->desc) {
ionic_tx_clean(q, rewind, NULL, NULL);
rewind = rewind->next;
}
q->head = abort;
return -ENOMEM;
}
static int ionic_tx_calc_csum(struct ionic_queue *q, struct sk_buff *skb)
{
struct ionic_tx_stats *stats = q_to_tx_stats(q);
struct ionic_txq_desc *desc = q->head->desc;
struct device *dev = q->lif->ionic->dev;
dma_addr_t dma_addr;
bool has_vlan;
u8 flags = 0;
bool encap;
u64 cmd;
has_vlan = !!skb_vlan_tag_present(skb);
encap = skb->encapsulation;
dma_addr = ionic_tx_map_single(q, skb->data, skb_headlen(skb));
if (dma_mapping_error(dev, dma_addr))
return -ENOMEM;
flags |= has_vlan ? IONIC_TXQ_DESC_FLAG_VLAN : 0;
flags |= encap ? IONIC_TXQ_DESC_FLAG_ENCAP : 0;
cmd = encode_txq_desc_cmd(IONIC_TXQ_DESC_OPCODE_CSUM_PARTIAL,
flags, skb_shinfo(skb)->nr_frags, dma_addr);
desc->cmd = cpu_to_le64(cmd);
desc->len = cpu_to_le16(skb_headlen(skb));
desc->csum_start = cpu_to_le16(skb_checksum_start_offset(skb));
desc->csum_offset = cpu_to_le16(skb->csum_offset);
if (has_vlan) {
desc->vlan_tci = cpu_to_le16(skb_vlan_tag_get(skb));
stats->vlan_inserted++;
}
if (skb->csum_not_inet)
stats->crc32_csum++;
else
stats->csum++;
return 0;
}
static int ionic_tx_calc_no_csum(struct ionic_queue *q, struct sk_buff *skb)
{
struct ionic_tx_stats *stats = q_to_tx_stats(q);
struct ionic_txq_desc *desc = q->head->desc;
struct device *dev = q->lif->ionic->dev;
dma_addr_t dma_addr;
bool has_vlan;
u8 flags = 0;
bool encap;
u64 cmd;
has_vlan = !!skb_vlan_tag_present(skb);
encap = skb->encapsulation;
dma_addr = ionic_tx_map_single(q, skb->data, skb_headlen(skb));
if (dma_mapping_error(dev, dma_addr))
return -ENOMEM;
flags |= has_vlan ? IONIC_TXQ_DESC_FLAG_VLAN : 0;
flags |= encap ? IONIC_TXQ_DESC_FLAG_ENCAP : 0;
cmd = encode_txq_desc_cmd(IONIC_TXQ_DESC_OPCODE_CSUM_NONE,
flags, skb_shinfo(skb)->nr_frags, dma_addr);
desc->cmd = cpu_to_le64(cmd);
desc->len = cpu_to_le16(skb_headlen(skb));
if (has_vlan) {
desc->vlan_tci = cpu_to_le16(skb_vlan_tag_get(skb));
stats->vlan_inserted++;
}
stats->csum_none++;
return 0;
}
static int ionic_tx_skb_frags(struct ionic_queue *q, struct sk_buff *skb)
{
struct ionic_txq_sg_desc *sg_desc = q->head->sg_desc;
unsigned int len_left = skb->len - skb_headlen(skb);
struct ionic_txq_sg_elem *elem = sg_desc->elems;
struct ionic_tx_stats *stats = q_to_tx_stats(q);
struct device *dev = q->lif->ionic->dev;
dma_addr_t dma_addr;
skb_frag_t *frag;
u16 len;
for (frag = skb_shinfo(skb)->frags; len_left; frag++, elem++) {
len = skb_frag_size(frag);
elem->len = cpu_to_le16(len);
dma_addr = ionic_tx_map_frag(q, frag, 0, len);
if (dma_mapping_error(dev, dma_addr))
return -ENOMEM;
elem->addr = cpu_to_le64(dma_addr);