// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
/*
* Copyright(c) 2020 Intel Corporation.
*
*/
/*
* This file contains HFI1 support for IPOIB SDMA functionality
*/
#include <linux/log2.h>
#include <linux/circ_buf.h>
#include "sdma.h"
#include "verbs.h"
#include "trace_ibhdrs.h"
#include "ipoib.h"
#include "trace_tx.h"
/* Add a convenience helper */
#define CIRC_ADD(val, add, size) (((val) + (add)) & ((size) - 1))
#define CIRC_NEXT(val, size) CIRC_ADD(val, 1, size)
#define CIRC_PREV(val, size) CIRC_ADD(val, -1, size)
struct ipoib_txparms {
struct hfi1_devdata *dd;
struct rdma_ah_attr *ah_attr;
struct hfi1_ibport *ibp;
struct hfi1_ipoib_txq *txq;
union hfi1_ipoib_flow flow;
u32 dqpn;
u8 hdr_dwords;
u8 entropy;
};
static struct ipoib_txreq *
hfi1_txreq_from_idx(struct hfi1_ipoib_circ_buf *r, u32 idx)
{
return (struct ipoib_txreq *)(r->items + (idx << r->shift));
}
static u32 hfi1_ipoib_txreqs(const u64 sent, const u64 completed)
{
return sent - completed;
}
static u64 hfi1_ipoib_used(struct hfi1_ipoib_txq *txq)
{
return hfi1_ipoib_txreqs(txq->tx_ring.sent_txreqs,
txq->tx_ring.complete_txreqs);
}
static void hfi1_ipoib_stop_txq(struct hfi1_ipoib_txq *txq)
{
trace_hfi1_txq_stop(txq);
if (atomic_inc_return(&txq->tx_ring.stops) == 1)
netif_stop_subqueue(txq->priv->netdev, txq->q_idx);
}
static void hfi1_ipoib_wake_txq(struct hfi1_ipoib_txq *txq)
{
trace_hfi1_txq_wake(txq);
if (atomic_dec_and_test(&txq->tx_ring.stops))
netif_wake_subqueue(txq->priv->netdev, txq->q_idx);
}
static uint hfi1_ipoib_ring_hwat(struct hfi1_ipoib_txq *txq)
{
return min_t(uint, txq->priv->netdev->tx_queue_len,
txq->tx_ring.max_items - 1);
}
static uint hfi1_ipoib_ring_lwat(struct hfi1_ipoib_txq *txq)
{
return min_t(uint, txq->priv->netdev->tx_queue_len,
txq->tx_ring.max_items) >> 1;
}
static void hfi1_ipoib_check_queue_depth(struct hfi1_ipoib_txq *txq)
{
++txq->tx_ring.sent_txreqs;
if (hfi1_ipoib_used(txq) >= hfi1_ipoib_ring_hwat(txq) &&
!atomic_xchg(&txq->tx_ring.ring_full, 1)) {
trace_hfi1_txq_full(txq);
hfi1_ipoib_stop_txq(txq);
}
}
static void hfi1_ipoib_check_queue_stopped(struct hfi1_ipoib_txq *txq)
{
struct net_device *dev = txq->priv->netdev;
/* If shutting down just return as queue state is irrelevant */
if (unlikely(dev->reg_state != NETREG_REGISTERED))
return;
/*
* When the queue has been drained to less than half full it will be
* restarted.
* The size of the txreq ring is fixed at initialization.
* The tx queue len can be adjusted upward while the interface is
* running.
* The tx queue len can be large enough to overflow the txreq_ring.
* Use the minimum of the current tx_queue_len or the rings max txreqs
* to protect against ring overflow.
*/
if (hfi1_ipoib_used(txq) < hfi1_ipoib_ring_lwat(txq) &&
atomic_xchg(&txq->tx_ring.ring_full, 0)) {
trace_hfi1_txq_xmit_unstopped(txq);
hfi1_ipoib_wake_txq(txq);
}
}
static void hfi1_ipoib_free_tx(struct ipoib_txreq *tx, int budget)
{
struct hfi1_ipoib_dev_priv *priv = tx->txq->priv;
if (likely(!tx->sdma_status)) {
dev_sw_netstats_tx_add(priv->netdev, 1, tx->skb->len);
} else {
++priv->netdev->stats.tx_errors;
dd_dev_warn(priv->dd,
"%s: Status = 0x%x pbc 0x%llx txq = %d sde = %d\n",
__func__, tx->sdma_status,
le64_to_cpu(tx->sdma_hdr->pbc), tx->txq->q_idx,
tx->txq->sde->this_idx);
}
napi_consume_skb(tx->skb, budget);
tx->skb = NULL;
sdma_txclean(priv->dd, &tx->txreq);
}
static void hfi1_ipoib_drain_tx_ring(struct hfi1_ipoib_txq *txq)
{
struct hfi1_ipoib_circ_buf *tx_ring = &txq->tx_ring;
int i;
struct ipoib_txreq *tx;
for (i = 0; i < tx_ring->max_items; i++) {
tx = hfi1_txreq_from_idx(tx_ring, i);
tx->complete = 0;
dev_kfree_skb_any(tx->skb);
tx->skb = NULL;
sdma_txclean(txq->priv->dd, &tx->txreq);
}
tx_ring->head = 0;
tx_ring->tail = 0;
tx_ring->complete_txreqs = 0;
tx_ring->sent_txreqs = 0;
tx_ring->avail = hfi1_ipoib_ring_hwat(txq);
}
static int hfi1_ipoib_poll_tx_ring(struct napi_struct *napi, int budget)
{
struct hfi1_ipoib_txq *txq =
container_of(napi, struct hfi1_ipoib_txq, napi);
struct hfi1_ipoib_circ_buf *tx_ring = &txq->tx_ring;
u32 head = tx_ring->head;
u32 max_tx = tx_ring->max_items;
int work_done;
struct ipoib_txreq *tx = hfi1_txreq_from_idx(tx_ring, head);
trace_hfi1_txq_poll(txq);
for (work_done = 0; work_done < budget; work_done++) {
/* See hfi1_ipoib_sdma_complete() */
if (!smp_load_acquire(&tx->complete))
break;
tx->complete = 0;
trace_hfi1_tx_produce(tx, head);
hfi1_ipoib_free_tx(tx, budget);
head = CIRC_NEXT(head, max_tx);
tx = hfi1_txreq_from_idx(tx_ring, head);
}
tx_ring->complete_txreqs += work_done;
/* Finished freeing tx items so store the head value. */
smp_store_release(&tx_ring->head, head);
hfi1_ipoib_check_queue_stopped(txq);
if (work_done < budget)
napi_complete_done(napi, work_done);
return work_done;
}
static void hfi1_ipoib_sdma_complete(struct sdma_txreq *txreq, int status)
{
struct ipoib_txreq *tx = container_of(txreq, struct ipoib_txreq, txreq);
trace_hfi1_txq_complete(tx->txq);
tx->sdma_status = status;
/* see hfi1_ipoib_poll_tx_ring */
smp_store_release(&tx->complete, 1);
napi_schedule_irqoff(&tx->txq->napi);
}
static int hfi1_ipoib_build_ulp_payload(struct ipoib_txreq *tx,
struct ipoib_txparms *txp)
{
struct hfi1_devdata *dd = txp->dd;
struct sdma_txreq *txreq = &tx->txreq;
struct sk_buff *skb = tx->skb;
int ret = 0;
int i;
if (skb_headlen(skb)) {
ret = sdma_txadd_kvaddr(dd, txreq, skb->data, skb_headlen(skb));
if (unlikely(ret))
return ret;
}
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
ret = sdma_txadd_page(dd,
txreq,
skb_frag_page(frag),
skb_frag_off(frag),
skb_frag_size(frag),
NULL, NULL, NULL);
if (unlikely(ret))
break;
}
return ret;
}
static int hfi1_ipoib_build_tx_desc(struct ipoib_txreq *tx,
struct ipoib_txparms *txp)
{
struct hfi1_devdata *dd = txp->dd;
struct sdma_txreq *txreq = &tx->txreq;
struct hfi1_sdma_header *sdma_hdr = tx->sdma_hdr;
u16 pkt_bytes =
sizeof(sdma_hdr->pbc) + (txp->hdr_dwords << 2) + tx->skb->len;
int ret;
ret = sdma_txinit(txreq, 0, pkt_bytes, hfi1_ipoib_sdma_complete);
if (unlikely(ret))
return ret;
/* add pbc + headers */
ret = sdma_txadd_kvaddr(dd,
txreq,
sdma_hdr,
sizeof(sdma_hdr->pbc) + (txp->hdr_dwords << 2));
if (unlikely(ret))
return ret;
/* add the ulp payload */
return hfi1_ipoib_build_ulp_payload(tx, txp);
}
static void hfi1_ipoib_build_ib_tx_headers(struct ipoib_txreq *tx,
struct ipoib_txparms *txp)
{
struct hfi1_ipoib_dev_priv *priv = tx->txq->priv;
struct hfi1_sdma_header *sdma_hdr = tx->sdma_hdr;
struct sk_buff *skb = tx->skb;
struct hfi1_pportdata *ppd = ppd_from_ibp(txp->ibp);
struct rdma_ah_attr *ah_attr = txp->ah_attr;
struct ib_other_headers *ohdr;
struct ib_grh *grh;
u16 dwords;
u16 slid;
u16 dlid;
u16 lrh0;
u32 bth0;
u32 sqpn = (u32)(priv->netdev->dev_addr[1] << 16 |
priv->netdev->dev_addr[2] << 8 |
priv->netdev->dev_addr[3]);
u16 payload_dwords;
u8 pad_cnt;
pad_cnt = -skb->len & 3;
/* Includes ICRC */
payload_dwords = ((skb->len + pad_cnt) >> 2) + SIZE_OF_CRC;
/* header size in dwords LRH+BTH+DETH = (8+12+8)/4. */
txp->hdr_dwords = 7;
if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
grh = &sdma_hdr->hdr.ibh.u.l.grh;
txp->hdr_dwords +=
hfi1_make_grh(txp->ibp,
grh,
rdma_ah_read_grh(ah_attr),
txp->hdr_dwords - LRH_9B_DWORDS,
payload_dwords);
lrh0 = HFI1_LRH_GRH;
ohdr = &sdma_hdr->hdr.ibh.u.l.oth;
} else {
lrh0 = HFI1_LRH_BTH;
ohdr = &sdma_hdr->hdr.ibh.u.oth;
}
lrh0 |= (rdma_ah_get_sl(ah_attr) & 0xf) << 4;
lrh0 |= (txp->flow.sc5 & 0xf) << 12;
dlid = opa_get_lid(rdma_ah_get_dlid(ah_attr), 9B);
if (dlid == be16_to_cpu(IB_LID_PERMISSIVE)) {
slid = be16_to_cpu(IB_LID_PERMISSIVE);
} else {
u16 lid = (u16)ppd->lid;
if (lid) {
lid |= rdma_ah_get_path_bits(ah_attr) &
((1 << ppd->lmc) - 1);
slid = lid;
} else {
slid = be16_to_cpu(IB_LID_PERMISSIVE);
}
}
/* Includes ICRC */
dwords = txp->hdr_dwords + payload_dwords;
/* Build the lrh */
sdma_hdr->hdr.hdr_type = HFI1_PKT_TYPE_9B;
hfi1_make_ib_hdr(&sdma_hdr->hdr.ibh, lrh0, dwords, dlid, slid);
/* Build the bth */
bth0 = (IB_OPCODE_UD_SEND_ONLY << 24) | (pad_cnt << 20) | priv->pkey;
ohdr->bth[0] = cpu_to_be32(bth0);
ohdr->bth[1] = cpu_to_be32(txp->dqpn);
ohdr->bth[2] = cpu_to_be32(mask_psn((u32)txp->txq->tx_ring.sent_txreqs));
/* Build the deth */
ohdr->u.ud.deth[0] = cpu_to_be32(priv->qkey);
ohdr->u.ud.deth[1] = cpu_to_be32((txp->entropy <<
HFI1_IPOIB_ENTROPY_SHIFT) | sqpn);
/* Construct the pbc. */
sdma_hdr->pbc =
cpu_to_le64(create_pbc(ppd,
ib_is_sc5(txp->flow.sc5) <<
PBC_DC_INFO_SHIFT,
0,
sc_to_vlt(priv->dd, txp->flow.sc5),
dwords - SIZE_OF_CRC +
(sizeof(sdma_hdr->pbc) >> 2)));
}
static struct ipoib_txreq *hfi1_ipoib_send_dma_common(struct net_device *dev,
struct sk_buff *skb,
struct ipoib_txparms *txp)
{
struct hfi1_ipoib_dev_priv *priv = hfi1_ipoib_priv(dev);
struct hfi1_ipoib_txq *txq = txp->txq;
struct ipoib_txreq *tx;
struct hfi1_ipoib_circ_buf *tx_ring = &txq->tx_ring;
u32 tail = tx_ring->tail;
int ret;
if (unlikely(!tx_ring->avail)) {
u32 head;
if (hfi1_ipoib_used(txq) >= hfi1_ipoib_ring_hwat(txq))
/* This shouldn't happen with a stopped queue */
return ERR_PTR(-ENOMEM);
/* See hfi1_ipoib_poll_tx_ring() */
head = smp_load_acquire(&tx_ring->head);
tx_ring->avail =
min_t(u32, hfi1_ipoib_ring_hwat(txq),
CIRC_CNT(head, tail, tx_ring->max_items));
} else {
tx_ring->avail--;
}
tx = hfi1_txreq_from_idx(tx_ring, tail);
trace_hfi1_txq_alloc_tx(txq);
/* so that we can test if the sdma descriptors are there */
tx->txreq.num_desc = 0;
tx->txq = txq;
tx->skb = skb;
INIT_LIST_HEAD(&tx->txreq.list);
hfi1_ipoib_build_ib_tx_headers(tx, txp);
ret = hfi1_ipoib_build_tx_desc(tx, txp);
if (likely(!ret)) {
if (txq->flow.as_int != txp->flow.as_int) {
txq->flow.tx_queue = txp->flow.tx_queue;
txq->flow.sc5 = txp->flow.sc5;
txq->sde =
sdma_select_engine_sc(priv->dd,
txp->flow.tx_queue,
txp->flow.sc5);
trace_hfi1_flow_switch(txq);
}
return tx;
}
sdma_txclean(priv->dd, &tx->txreq);
return ERR_PTR(ret);
}
static int hfi1_ipoib_submit_tx_list(struct net_device *dev,
struct hfi1_ipoib_txq *txq)
{
int ret;
u16 count_out;
ret = sdma_send_txlist(txq->sde,
iowait_get_ib_work(&txq->wait),
&txq->tx_list,
&count_out);
if (likely(!ret) || ret == -EBUSY || ret == -ECOMM)
return ret;
dd_dev_warn(txq->priv->dd, "cannot send skb tx list, err %d.\n", ret);
return ret;
}
static int hfi1_ipoib_flush_tx_list(struct net_device *dev,
struct hfi1_ipoib_txq *txq)
{
int ret = 0;
if (!list_empty(&txq->tx_list)) {
/* Flush the current list */
ret = hfi1_ipoib_submit_tx_list(dev, txq);
if (unlikely(ret))
if (ret != -EBUSY)
++dev->stats.tx_carrier_errors;
}
return ret;
}
static int hfi1_ipoib_submit_tx(struct hfi1_ipoib_txq *txq,
struct ipoib_txreq *tx)
{
int ret;
ret = sdma_send_txreq(txq->sde,
iowait_get_ib_work(&txq->wait),
&tx->txreq,
txq->pkts_sent);
if (likely(!ret)) {
txq->pkts_sent = true;
iowait_starve_clear(txq->pkts_sent, &txq->wait);
}
return ret;
}
static int hfi1_ipoib_send_dma_single(struct net_device *dev,
struct sk_buff *skb,
struct ipoib_txparms *txp)
{
struct hfi1_ipoib_txq *txq = txp->txq;
struct hfi1_ipoib_circ_buf *tx_ring;
struct ipoib_txreq *tx;
int ret;
tx = hfi1_ipoib_send_dma_common(dev, skb, txp);
if (IS_ERR(tx)) {
int ret = PTR_ERR(tx);
dev_kfree_skb_any(skb);
if (ret == -ENOMEM)
++dev->stats.tx_errors;
else
++dev->stats.tx_carrier_errors;
return NETDEV_TX_OK;
}
tx_ring = &txq->tx_ring;
trace_hfi1_tx_consume(tx, tx_ring->tail);
/* consume tx */
smp_store_release(&tx_ring->tail, CIRC_NEXT(tx_ring->tail, tx_ring->max_items));
ret = hfi1_ipoib_submit_tx(txq, tx);
if (likely(!ret)) {
tx_ok:
trace_sdma_output_ibhdr(txq->priv->dd,
&tx->sdma_hdr->hdr,
ib_is_sc5(txp->flow.sc5));
hfi1_ipoib_check_queue_depth(txq);
return NETDEV_TX_OK;
}
txq->pkts_sent = false;
if (ret == -EBUSY || ret == -ECOMM)
goto tx_ok;
/* mark complete and kick napi tx */
smp_store_release(&tx->complete, 1);
napi_schedule(&tx->txq->napi);
++dev->stats.tx_carrier_errors;
return NETDEV_TX_OK;
}
static int hfi1_ipoib_send_dma_list(struct net_device *dev,
struct sk_buff *skb,
struct ipoib_txparms *txp)
{
struct hfi1_ipoib_txq *txq = txp->txq;
struct hfi1_ipoib_circ_buf *tx_ring;
struct ipoib_txreq *tx;
/* Has the flow change ? */
if (txq->flow.as_int != txp->flow.as_int) {
int ret;
trace_hfi1_flow_flush(txq);
ret = hfi1_ipoib_flush_tx_list(dev, txq);
if (unlikely(ret)) {
if (ret == -EBUSY)
++dev->stats.tx_dropped;
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
}
tx = hfi1_ipoib_send_dma_common(dev, skb, txp);
if (IS_ERR(tx)) {
int ret = PTR_ERR(tx);
dev_kfree_skb_any(skb);
if (ret == -ENOMEM)
++dev->stats.tx_errors;
else
++dev->stats.tx_carrier_errors;
return NETDEV_TX_OK;
}
tx_ring = &txq->tx_ring;
trace_hfi1_tx_consume(tx, tx_ring->tail);
/* consume tx */
smp_store_release(&tx_ring->tail, CIRC_NEXT(tx_ring->tail, tx_ring->max_items));
list_add_tail(&tx->txreq.list, &txq->tx_list);
hfi1_ipoib_check_queue_depth(txq);
trace_sdma_output_ibhdr(txq->priv->dd,
&tx->sdma_hdr->hdr,
ib_is_sc5(txp->flow.sc5));
if (!netdev_xmit_more())
(void)hfi1_ipoib_flush_tx_list(dev, txq);
return NETDEV_TX_OK;
}
static u8 hfi1_ipoib_calc_entropy(struct sk_buff *skb)
{
if (skb_transport_header_was_set(skb)) {
u8 *hdr = (u8 *)skb_transport_header(skb);
return (hdr[0] ^ hdr[1] ^ hdr[2] ^ hdr[3]);
}
return (u8)skb_get_queue_mapping(skb);
}
int hfi1_ipoib_send(struct net_device *dev,
struct sk_buff *skb,
struct ib_ah *address,
u32 dqpn)
{
struct hfi1_ipoib_dev_priv *priv = hfi1_ipoib_priv(dev);
struct ipoib_txparms txp;
struct rdma_netdev *rn = netdev_priv(dev);
if (unlikely(skb->len > rn->mtu + HFI1_IPOIB_ENCAP_LEN)) {
dd_dev_warn(priv->dd, "packet len %d (> %d) too long to send, dropping\n",
skb->len,
rn->mtu + HFI1_IPOIB_ENCAP_LEN);
++dev->stats.tx_dropped;
++dev->stats.tx_errors;
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
txp.dd = priv->dd;
txp.ah_attr = &ibah_to_rvtah(address)->attr;
txp.ibp = to_iport(priv->device, priv->port_num);
txp.txq = &priv->txqs[skb_get_queue_mapping(skb)];
txp.dqpn = dqpn;
txp.flow.sc5 = txp.ibp->sl_to_sc[rdma_ah_get_sl(txp.ah_attr)];
txp.flow.tx_queue = (u8)skb_get_queue_mapping(skb);
txp.entropy = hfi1_ipoib_calc_entropy(skb);
if (netdev_xmit_more() || !list_empty(&txp.txq->tx_list))
return hfi1_ipoib_send_dma_list(dev, skb, &txp);
return hfi1_ipoib_send_dma_single(dev, skb, &txp);
}
/*
* hfi1_ipoib_sdma_sleep - ipoib sdma sleep function
*
* This function gets called from sdma_send_txreq() when there are not enough
* sdma descriptors available to send the packet. It adds Tx queue's wait
* structure to sdma engine's dmawait list to be woken up when descriptors
* become available.
*/
static int hfi1_ipoib_sdma_sleep(struct sdma_engine *sde,
struct iowait_work *wait,
struct sdma_txreq *txreq,
uint seq,
bool pkts_sent)
{
struct hfi1_ipoib_txq *txq =
container_of(wait->iow, struct hfi1_ipoib_txq, wait);
write_seqlock(&sde->waitlock);
if (likely(txq->priv->netdev->reg_state == NETREG_REGISTERED)) {
if (sdma_progress(sde, seq, txreq)) {
write_sequnlock(&sde->waitlock);
return -EAGAIN;
}
if (list_empty(&txreq->list))
/* came from non-list submit */
list_add_tail(&txreq->list, &txq->tx_list);
if (list_empty(&txq->wait.list)) {
struct hfi1_ibport *ibp = &sde->ppd->ibport_data;
if (!atomic_xchg(&txq->tx_ring.no_desc, 1)) {
trace_hfi1_txq_queued(txq);
hfi1_ipoib_stop_txq(txq);
}
ibp->rvp.n_dmawait++;
iowait_queue(pkts_sent, wait->iow, &sde->dmawait);
}
write_sequnlock(&sde->waitlock);
return -EBUSY;
}
write_sequnlock(&sde->waitlock);
return -EINVAL;
}
/*
* hfi1_ipoib_sdma_wakeup - ipoib sdma wakeup function
*
* This function gets called when SDMA descriptors becomes available and Tx
* queue's wait structure was previously added to sdma engine's dmawait list.
*/
static void hfi1_ipoib_sdma_wakeup(struct iowait *wait, int reason)
{
struct hfi1_ipoib_txq *txq =
container_of(wait, struct hfi1_ipoib_txq, wait);
trace_hfi1_txq_wakeup(txq);
if (likely(txq->priv->netdev->reg_state == NETREG_REGISTERED))
iowait_schedule(wait, system_highpri_wq, WORK_CPU_UNBOUND);
}
static void hfi1_ipoib_flush_txq(struct work_struct *work)
{
struct iowait_work *ioww =
container_of(work, struct iowait_work, iowork);
struct iowait *wait = iowait_ioww_to_iow(ioww);
struct hfi1_ipoib_txq *txq =
container_of(wait, struct hfi1_ipoib_txq, wait);
struct net_device *dev = txq->priv->netdev;
if (likely(dev->reg_state == NETREG_REGISTERED) &&
likely(!hfi1_ipoib_flush_tx_list(dev, txq)))
if (atomic_xchg(&txq->tx_ring.no_desc, 0))
hfi1_ipoib_wake_txq(txq);
}
int hfi1_ipoib_txreq_init(struct hfi1_ipoib_dev_priv *priv)
{
struct net_device *dev = priv->netdev;
u32 tx_ring_size, tx_item_size;
struct hfi1_ipoib_circ_buf *tx_ring;
int i, j;
/*
* Ring holds 1 less than tx_ring_size
* Round up to next power of 2 in order to hold at least tx_queue_len
*/
tx_ring_size = roundup_pow_of_two(dev->tx_queue_len + 1);
tx_item_size = roundup_pow_of_two(sizeof(struct ipoib_txreq));
priv->txqs = kcalloc_node(dev->num_tx_queues,
sizeof(struct hfi1_ipoib_txq),
GFP_KERNEL,
priv->dd->node);
if (!priv->txqs)
return -ENOMEM;
for (i = 0; i < dev->num_tx_queues; i++) {
struct hfi1_ipoib_txq *txq = &priv->txqs[i];
struct ipoib_txreq *tx;
tx_ring = &txq->tx_ring;
iowait_init(&txq->wait,
0,
hfi1_ipoib_flush_txq,
NULL,
hfi1_ipoib_sdma_sleep,
hfi1_ipoib_sdma_wakeup,
NULL,
NULL);
txq->priv = priv;
txq->sde = NULL;
INIT_LIST_HEAD(&txq->tx_list);
atomic_set(&txq->tx_ring.stops, 0);
atomic_set(&txq->tx_ring.ring_full, 0);
atomic_set(&txq->tx_ring.no_desc, 0);
txq->q_idx = i;
txq->flow.tx_queue = 0xff;
txq->flow.sc5 = 0xff;
txq->pkts_sent = false;
netdev_queue_numa_node_write(netdev_get_tx_queue(dev, i),
priv->dd->node);
txq->tx_ring.items =
kvzalloc_node(array_size(tx_ring_size, tx_item_size),
GFP_KERNEL, priv->dd->node);
if (!txq->tx_ring.items)
goto free_txqs;
txq->tx_ring.max_items = tx_ring_size;
txq->tx_ring.shift = ilog2(tx_item_size);
txq->tx_ring.avail = hfi1_ipoib_ring_hwat(txq);
tx_ring = &txq->tx_ring;
for (j = 0; j < tx_ring_size; j++) {
hfi1_txreq_from_idx(tx_ring, j)->sdma_hdr =
kzalloc_node(sizeof(*tx->sdma_hdr),
GFP_KERNEL, priv->dd->node);
if (!hfi1_txreq_from_idx(tx_ring, j)->sdma_hdr)
goto free_txqs;
}
netif_napi_add_tx(dev, &txq->napi, hfi1_ipoib_poll_tx_ring);
}
return 0;
free_txqs:
for (i--; i >= 0; i--) {
struct hfi1_ipoib_txq *txq = &priv->txqs[i];
netif_napi_del(&txq->napi);
tx_ring = &txq->tx_ring;
for (j = 0; j < tx_ring_size; j++)
kfree(hfi1_txreq_from_idx(tx_ring, j)->sdma_hdr);
kvfree(tx_ring->items);
}
kfree(priv->txqs);
priv->txqs = NULL;
return -ENOMEM;
}
static void hfi1_ipoib_drain_tx_list(struct hfi1_ipoib_txq *txq)
{
struct sdma_txreq *txreq;
struct sdma_txreq *txreq_tmp;
list_for_each_entry_safe(txreq, txreq_tmp, &txq->tx_list, list) {
struct ipoib_txreq *tx =
container_of(txreq, struct ipoib_txreq, txreq);
list_del(&txreq->list);
sdma_txclean(txq->priv->dd, &tx->txreq);
dev_kfree_skb_any(tx->skb);
tx->skb = NULL;
txq->tx_ring.complete_txreqs++;
}
if (hfi1_ipoib_used(txq))
dd_dev_warn(txq->priv->dd,
"txq %d not empty found %u requests\n",
txq->q_idx,
hfi1_ipoib_txreqs(txq->tx_ring.sent_txreqs,
txq->tx_ring.complete_txreqs));
}
void hfi1_ipoib_txreq_deinit(struct hfi1_ipoib_dev_priv *priv)
{
int i, j;
for (i = 0; i < priv->netdev->num_tx_queues; i++) {
struct hfi1_ipoib_txq *txq = &priv->txqs[i];
struct hfi1_ipoib_circ_buf *tx_ring = &txq->tx_ring;
iowait_cancel_work(&txq->wait);
iowait_sdma_drain(&txq->wait);
hfi1_ipoib_drain_tx_list(txq);
netif_napi_del(&txq->napi);
hfi1_ipoib_drain_tx_ring(txq);
for (j = 0; j < tx_ring->max_items; j++)
kfree(hfi1_txreq_from_idx(tx_ring, j)->sdma_hdr);
kvfree(tx_ring->items);
}
kfree(priv->txqs);
priv->txqs = NULL;
}
void hfi1_ipoib_napi_tx_enable(struct net_device *dev)
{
struct hfi1_ipoib_dev_priv *priv = hfi1_ipoib_priv(dev);
int i;
for (i = 0; i < dev->num_tx_queues; i++) {
struct hfi1_ipoib_txq *txq = &priv->txqs[i];
napi_enable(&txq->napi);
}
}
void hfi1_ipoib_napi_tx_disable(struct net_device *dev)
{
struct hfi1_ipoib_dev_priv *priv = hfi1_ipoib_priv(dev);
int i;
for (i = 0; i < dev->num_tx_queues; i++) {
struct hfi1_ipoib_txq *txq = &priv->txqs[i];
napi_disable(&txq->napi);
hfi1_ipoib_drain_tx_ring(txq);
}
}
void hfi1_ipoib_tx_timeout(struct net_device *dev, unsigned int q)
{
struct hfi1_ipoib_dev_priv *priv = hfi1_ipoib_priv(dev);
struct hfi1_ipoib_txq *txq = &priv->txqs[q];
dd_dev_info(priv->dd, "timeout txq %p q %u stopped %u stops %d no_desc %d ring_full %d\n",
txq, q,
__netif_subqueue_stopped(dev, txq->q_idx),
atomic_read(&txq->tx_ring.stops),
atomic_read(&txq->tx_ring.no_desc),
atomic_read(&txq->tx_ring.ring_full));
dd_dev_info(priv->dd, "sde %p engine %u\n",
txq->sde,
txq->sde ? txq->sde->this_idx : 0);
dd_dev_info(priv->dd, "flow %x\n", txq->flow.as_int);
dd_dev_info(priv->dd, "sent %llu completed %llu used %llu\n",
txq->tx_ring.sent_txreqs, txq->tx_ring.complete_txreqs,
hfi1_ipoib_used(txq));
dd_dev_info(priv->dd, "tx_queue_len %u max_items %u\n",
dev->tx_queue_len, txq->tx_ring.max_items);
dd_dev_info(priv->dd, "head %u tail %u\n",
txq->tx_ring.head, txq->tx_ring.tail);
dd_dev_info(priv->dd, "wait queued %u\n",
!list_empty(&txq->wait.list));
dd_dev_info(priv->dd, "tx_list empty %u\n",
list_empty(&txq->tx_list));
}
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