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Message-Id: <20200527042921.3951830-12-jeffrey.t.kirsher@intel.com>
Date: Tue, 26 May 2020 21:29:17 -0700
From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To: davem@...emloft.net
Cc: Alice Michael <alice.michael@...el.com>, netdev@...r.kernel.org,
nhorman@...hat.com, sassmann@...hat.com,
Alan Brady <Alan.Brady@...el.com>,
Phani Burra <phani.r.burra@...el.com>,
Joshua Hay <joshua.a.hay@...el.com>,
Madhu Chittim <madhu.chittim@...el.com>,
Pavan Kumar Linga <Pavan.Kumar.Linga@...el.com>,
Donald Skidmore <donald.c.skidmore@...el.com>,
Jesse Brandeburg <jesse.brandeburg@...el.com>,
Sridhar Samudrala <sridhar.samudrala@...el.com>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next RFC 11/15] iecm: Add splitq TX/RX
From: Alice Michael <alice.michael@...el.com>
Implement main TX/RX flows for split queue model.
Signed-off-by: Alice Michael <alice.michael@...el.com>
Signed-off-by: Alan Brady <Alan.Brady@...el.com>
Signed-off-by: Phani Burra <phani.r.burra@...el.com>
Signed-off-by: Joshua Hay <joshua.a.hay@...el.com>
Signed-off-by: Madhu Chittim <madhu.chittim@...el.com>
Signed-off-by: Pavan Kumar Linga <Pavan.Kumar.Linga@...el.com>
Reviewed-by: Donald Skidmore <donald.c.skidmore@...el.com>
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
Reviewed-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
drivers/net/ethernet/intel/iecm/iecm_txrx.c | 1283 ++++++++++++++++++-
1 file changed, 1235 insertions(+), 48 deletions(-)
diff --git a/drivers/net/ethernet/intel/iecm/iecm_txrx.c b/drivers/net/ethernet/intel/iecm/iecm_txrx.c
index c9e92e40b024..f6225c18959b 100644
--- a/drivers/net/ethernet/intel/iecm/iecm_txrx.c
+++ b/drivers/net/ethernet/intel/iecm/iecm_txrx.c
@@ -11,7 +11,12 @@
static enum iecm_status iecm_buf_lifo_push(struct iecm_buf_lifo *stack,
struct iecm_tx_buf *buf)
{
- /* stub */
+ if (stack->top == stack->size)
+ return IECM_ERR_MAX_LIMIT;
+
+ stack->bufs[stack->top++] = buf;
+
+ return 0;
}
/**
@@ -20,7 +25,10 @@ static enum iecm_status iecm_buf_lifo_push(struct iecm_buf_lifo *stack,
**/
static struct iecm_tx_buf *iecm_buf_lifo_pop(struct iecm_buf_lifo *stack)
{
- /* stub */
+ if (!stack->top)
+ return NULL;
+
+ return stack->bufs[--stack->top];
}
/**
@@ -31,7 +39,16 @@ static struct iecm_tx_buf *iecm_buf_lifo_pop(struct iecm_buf_lifo *stack)
void iecm_get_stats64(struct net_device *netdev,
struct rtnl_link_stats64 *stats)
{
- /* stub */
+ struct iecm_vport *vport = iecm_netdev_to_vport(netdev);
+
+ iecm_send_get_stats_msg(vport);
+ stats->rx_packets = vport->netstats.rx_packets;
+ stats->tx_packets = vport->netstats.tx_packets;
+ stats->rx_bytes = vport->netstats.rx_bytes;
+ stats->tx_bytes = vport->netstats.tx_bytes;
+ stats->tx_errors = vport->netstats.tx_errors;
+ stats->rx_dropped = vport->netstats.rx_dropped;
+ stats->tx_dropped = vport->netstats.tx_dropped;
}
/**
@@ -1246,7 +1263,16 @@ enum iecm_status iecm_vport_queues_alloc(struct iecm_vport *vport)
static struct iecm_queue *
iecm_tx_find_q(struct iecm_vport *vport, int q_id)
{
- /* stub */
+ int i;
+
+ for (i = 0; i < vport->num_txq; i++) {
+ struct iecm_queue *tx_q = vport->txqs[i];
+
+ if (tx_q->q_id == q_id)
+ return tx_q;
+ }
+
+ return NULL;
}
/**
@@ -1255,7 +1281,22 @@ iecm_tx_find_q(struct iecm_vport *vport, int q_id)
*/
static void iecm_tx_handle_sw_marker(struct iecm_queue *tx_q)
{
- /* stub */
+ struct iecm_vport *vport = tx_q->vport;
+ bool drain_complete = true;
+ int i;
+
+ clear_bit(__IECM_Q_SW_MARKER, tx_q->flags);
+ /* Hardware must write marker packets to all queues associated with
+ * completion queues. So check if all queues received marker packets
+ */
+ for (i = 0; i < vport->num_txq; i++) {
+ if (test_bit(__IECM_Q_SW_MARKER, vport->txqs[i]->flags))
+ drain_complete = false;
+ }
+ if (drain_complete) {
+ set_bit(__IECM_VPORT_SW_MARKER, vport->flags);
+ wake_up(&vport->sw_marker_wq);
+ }
}
/**
@@ -1270,7 +1311,30 @@ static struct iecm_tx_queue_stats
iecm_tx_splitq_clean_buf(struct iecm_queue *tx_q, struct iecm_tx_buf *tx_buf,
int napi_budget)
{
- /* stub */
+ struct iecm_tx_queue_stats cleaned = {0};
+ struct netdev_queue *nq;
+
+ /* update the statistics for this packet */
+ cleaned.bytes = tx_buf->bytecount;
+ cleaned.packets = tx_buf->gso_segs;
+
+ /* free the skb */
+ napi_consume_skb(tx_buf->skb, napi_budget);
+ nq = netdev_get_tx_queue(tx_q->vport->netdev, tx_q->idx);
+ netdev_tx_completed_queue(nq, cleaned.packets,
+ cleaned.bytes);
+
+ /* unmap skb header data */
+ dma_unmap_single(tx_q->dev,
+ dma_unmap_addr(tx_buf, dma),
+ dma_unmap_len(tx_buf, len),
+ DMA_TO_DEVICE);
+
+ /* clear tx_buf data */
+ tx_buf->skb = NULL;
+ dma_unmap_len_set(tx_buf, len, 0);
+
+ return cleaned;
}
/**
@@ -1282,7 +1346,33 @@ iecm_tx_splitq_clean_buf(struct iecm_queue *tx_q, struct iecm_tx_buf *tx_buf,
static int
iecm_stash_flow_sch_buffers(struct iecm_queue *txq, struct iecm_tx_buf *tx_buf)
{
- /* stub */
+ struct iecm_adapter *adapter = txq->vport->adapter;
+ struct iecm_tx_buf *shadow_buf;
+
+ shadow_buf = iecm_buf_lifo_pop(&txq->buf_stack);
+ if (!shadow_buf) {
+ dev_err(&adapter->pdev->dev,
+ "No out-of-order TX buffers left!\n");
+ return -ENOMEM;
+ }
+
+ /* Store buffer params in shadow buffer */
+ shadow_buf->skb = tx_buf->skb;
+ shadow_buf->bytecount = tx_buf->bytecount;
+ shadow_buf->gso_segs = tx_buf->gso_segs;
+ shadow_buf->dma = tx_buf->dma;
+ shadow_buf->len = tx_buf->len;
+ shadow_buf->compl_tag = tx_buf->compl_tag;
+
+ /* Add buffer to buf_hash table to be freed
+ * later
+ */
+ hash_add(txq->sched_buf_hash, &shadow_buf->hlist,
+ shadow_buf->compl_tag);
+
+ memset(tx_buf, 0, sizeof(struct iecm_tx_buf));
+
+ return 0;
}
/**
@@ -1305,7 +1395,91 @@ static struct iecm_tx_queue_stats
iecm_tx_splitq_clean(struct iecm_queue *tx_q, u16 end, int napi_budget,
bool descs_only)
{
- /* stub */
+ union iecm_tx_flex_desc *next_pending_desc = NULL;
+ struct iecm_tx_queue_stats cleaned_stats = {0};
+ union iecm_tx_flex_desc *tx_desc;
+ s16 ntc = tx_q->next_to_clean;
+ struct iecm_tx_buf *tx_buf;
+
+ tx_desc = IECM_FLEX_TX_DESC(tx_q, ntc);
+ next_pending_desc = IECM_FLEX_TX_DESC(tx_q, end);
+ tx_buf = &tx_q->tx_buf[ntc];
+ ntc -= tx_q->desc_count;
+
+ while (tx_desc != next_pending_desc) {
+ union iecm_tx_flex_desc *eop_desc =
+ (union iecm_tx_flex_desc *)tx_buf->next_to_watch;
+
+ /* clear next_to_watch to prevent false hangs */
+ tx_buf->next_to_watch = NULL;
+
+ if (descs_only) {
+ if (iecm_stash_flow_sch_buffers(tx_q, tx_buf))
+ goto tx_splitq_clean_out;
+
+ while (tx_desc != eop_desc) {
+ tx_buf++;
+ tx_desc++;
+ ntc++;
+ if (unlikely(!ntc)) {
+ ntc -= tx_q->desc_count;
+ tx_buf = tx_q->tx_buf;
+ tx_desc = IECM_FLEX_TX_DESC(tx_q, 0);
+ }
+
+ if (dma_unmap_len(tx_buf, len)) {
+ if (iecm_stash_flow_sch_buffers(tx_q,
+ tx_buf))
+ goto tx_splitq_clean_out;
+ }
+ }
+ } else {
+ struct iecm_tx_queue_stats buf_stats = {0};
+
+ buf_stats = iecm_tx_splitq_clean_buf(tx_q, tx_buf,
+ napi_budget);
+
+ /* update the statistics for this packet */
+ cleaned_stats.bytes += buf_stats.bytes;
+ cleaned_stats.packets += buf_stats.packets;
+
+ /* unmap remaining buffers */
+ while (tx_desc != eop_desc) {
+ tx_buf++;
+ tx_desc++;
+ ntc++;
+ if (unlikely(!ntc)) {
+ ntc -= tx_q->desc_count;
+ tx_buf = tx_q->tx_buf;
+ tx_desc = IECM_FLEX_TX_DESC(tx_q, 0);
+ }
+
+ /* unmap any remaining paged data */
+ if (dma_unmap_len(tx_buf, len)) {
+ dma_unmap_page(tx_q->dev,
+ dma_unmap_addr(tx_buf, dma),
+ dma_unmap_len(tx_buf, len),
+ DMA_TO_DEVICE);
+ dma_unmap_len_set(tx_buf, len, 0);
+ }
+ }
+ }
+
+ tx_buf++;
+ tx_desc++;
+ ntc++;
+ if (unlikely(!ntc)) {
+ ntc -= tx_q->desc_count;
+ tx_buf = tx_q->tx_buf;
+ tx_desc = IECM_FLEX_TX_DESC(tx_q, 0);
+ }
+ }
+
+tx_splitq_clean_out:
+ ntc += tx_q->desc_count;
+ tx_q->next_to_clean = ntc;
+
+ return cleaned_stats;
}
/**
@@ -1315,7 +1489,18 @@ iecm_tx_splitq_clean(struct iecm_queue *tx_q, u16 end, int napi_budget,
*/
static inline void iecm_tx_hw_tstamp(struct sk_buff *skb, u8 *desc_ts)
{
- /* stub */
+ struct skb_shared_hwtstamps hwtstamps;
+ u64 tstamp;
+
+ /* Only report timestamp to stack if requested */
+ if (!likely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
+ return;
+
+ tstamp = (desc_ts[0] | (desc_ts[1] << 8) | (desc_ts[2] & 0x3F) << 16);
+ hwtstamps.hwtstamp =
+ ns_to_ktime(tstamp << IECM_TW_TIME_STAMP_GRAN_512_DIV_S);
+
+ skb_tstamp_tx(skb, &hwtstamps);
}
/**
@@ -1330,7 +1515,39 @@ static struct iecm_tx_queue_stats
iecm_tx_clean_flow_sch_bufs(struct iecm_queue *txq, u16 compl_tag,
u8 *desc_ts, int budget)
{
- /* stub */
+ struct iecm_tx_queue_stats cleaned_stats = {0};
+ struct hlist_node *tmp_buf = NULL;
+ struct iecm_tx_buf *tx_buf = NULL;
+
+ /* Buffer completion */
+ hash_for_each_possible_safe(txq->sched_buf_hash, tx_buf, tmp_buf,
+ hlist, compl_tag) {
+ if (tx_buf->compl_tag != compl_tag)
+ continue;
+
+ if (likely(tx_buf->skb)) {
+ /* fetch timestamp from completion
+ * descriptor to report to stack
+ */
+ iecm_tx_hw_tstamp(tx_buf->skb, desc_ts);
+
+ cleaned_stats = iecm_tx_splitq_clean_buf(txq, tx_buf,
+ budget);
+ } else if (dma_unmap_len(tx_buf, len)) {
+ dma_unmap_page(txq->dev,
+ dma_unmap_addr(tx_buf, dma),
+ dma_unmap_len(tx_buf, len),
+ DMA_TO_DEVICE);
+ dma_unmap_len_set(tx_buf, len, 0);
+ }
+
+ /* Push shadow buf back onto stack */
+ iecm_buf_lifo_push(&txq->buf_stack, tx_buf);
+
+ hash_del(&tx_buf->hlist);
+ }
+
+ return cleaned_stats;
}
/**
@@ -1343,7 +1560,109 @@ iecm_tx_clean_flow_sch_bufs(struct iecm_queue *txq, u16 compl_tag,
static bool
iecm_tx_clean_complq(struct iecm_queue *complq, int budget)
{
- /* stub */
+ struct iecm_splitq_tx_compl_desc *tx_desc;
+ struct iecm_vport *vport = complq->vport;
+ s16 ntc = complq->next_to_clean;
+ unsigned int complq_budget;
+
+ complq_budget = vport->compln_clean_budget;
+ tx_desc = IECM_SPLITQ_TX_COMPLQ_DESC(complq, ntc);
+ ntc -= complq->desc_count;
+
+ do {
+ struct iecm_tx_queue_stats cleaned_stats = {0};
+ bool descs_only = false;
+ struct iecm_queue *tx_q;
+ u16 compl_tag, hw_head;
+ int tx_qid;
+ u8 ctype; /* completion type */
+ u16 gen;
+
+ /* if the descriptor isn't done, no work yet to do */
+ gen = (le16_to_cpu(tx_desc->qid_comptype_gen) &
+ IECM_TXD_COMPLQ_GEN_M) >> IECM_TXD_COMPLQ_GEN_S;
+ if (test_bit(__IECM_Q_GEN_CHK, complq->flags) != gen)
+ break;
+
+ /* Find necessary info of TX queue to clean buffers */
+ tx_qid = (le16_to_cpu(tx_desc->qid_comptype_gen) &
+ IECM_TXD_COMPLQ_QID_M) >> IECM_TXD_COMPLQ_QID_S;
+ tx_q = iecm_tx_find_q(vport, tx_qid);
+ if (!tx_q) {
+ dev_err(&complq->vport->adapter->pdev->dev,
+ "TxQ #%d not found\n", tx_qid);
+ goto fetch_next_desc;
+ }
+
+ /* Determine completion type */
+ ctype = (le16_to_cpu(tx_desc->qid_comptype_gen) &
+ IECM_TXD_COMPLQ_COMPL_TYPE_M) >>
+ IECM_TXD_COMPLQ_COMPL_TYPE_S;
+ switch (ctype) {
+ case IECM_TXD_COMPLT_RE:
+ hw_head = le16_to_cpu(tx_desc->q_head_compl_tag.q_head);
+
+ cleaned_stats = iecm_tx_splitq_clean(tx_q, hw_head,
+ budget,
+ descs_only);
+ break;
+ case IECM_TXD_COMPLT_RS:
+ if (test_bit(__IECM_Q_FLOW_SCH_EN, tx_q->flags)) {
+ compl_tag =
+ le16_to_cpu(tx_desc->q_head_compl_tag.compl_tag);
+
+ cleaned_stats =
+ iecm_tx_clean_flow_sch_bufs(tx_q,
+ compl_tag,
+ tx_desc->ts,
+ budget);
+ } else {
+ hw_head =
+ le16_to_cpu(tx_desc->q_head_compl_tag.q_head);
+
+ cleaned_stats = iecm_tx_splitq_clean(tx_q,
+ hw_head,
+ budget,
+ false);
+ }
+
+ break;
+ case IECM_TXD_COMPLT_SW_MARKER:
+ iecm_tx_handle_sw_marker(tx_q);
+ break;
+ default:
+ dev_err(&tx_q->vport->adapter->pdev->dev,
+ "Unknown TX completion type: %d\n",
+ ctype);
+ goto fetch_next_desc;
+ }
+
+ tx_q->itr.stats.tx.packets += cleaned_stats.packets;
+ tx_q->itr.stats.tx.bytes += cleaned_stats.bytes;
+ u64_stats_update_begin(&tx_q->stats_sync);
+ tx_q->q_stats.tx.packets += cleaned_stats.packets;
+ tx_q->q_stats.tx.bytes += cleaned_stats.bytes;
+ u64_stats_update_end(&tx_q->stats_sync);
+
+fetch_next_desc:
+ tx_desc++;
+ ntc++;
+ if (unlikely(!ntc)) {
+ ntc -= complq->desc_count;
+ tx_desc = IECM_SPLITQ_TX_COMPLQ_DESC(complq, 0);
+ change_bit(__IECM_Q_GEN_CHK, complq->flags);
+ }
+
+ prefetch(tx_desc);
+
+ /* update budget accounting */
+ complq_budget--;
+ } while (likely(complq_budget));
+
+ ntc += complq->desc_count;
+ complq->next_to_clean = ntc;
+
+ return !!complq_budget;
}
/**
@@ -1359,7 +1678,12 @@ iecm_tx_splitq_build_ctb(union iecm_tx_flex_desc *desc,
struct iecm_tx_splitq_params *parms,
u16 td_cmd, u16 size)
{
- /* stub */
+ desc->q.qw1.cmd_dtype =
+ cpu_to_le16(parms->dtype & IECM_FLEX_TXD_QW1_DTYPE_M);
+ desc->q.qw1.cmd_dtype |=
+ cpu_to_le16((td_cmd << IECM_FLEX_TXD_QW1_CMD_S) &
+ IECM_FLEX_TXD_QW1_CMD_M);
+ desc->q.qw1.buf_size = cpu_to_le16((u16)size);
}
/**
@@ -1375,7 +1699,13 @@ iecm_tx_splitq_build_flow_desc(union iecm_tx_flex_desc *desc,
struct iecm_tx_splitq_params *parms,
u16 td_cmd, u16 size)
{
- /* stub */
+ desc->flow.qw1.cmd_dtype = cpu_to_le16((u16)parms->dtype | td_cmd);
+ desc->flow.qw1.rxr_bufsize = cpu_to_le16((u16)size);
+ desc->flow.qw1.compl_tag = cpu_to_le16(parms->compl_tag);
+
+ desc->flow.qw1.ts[0] = parms->offload.desc_ts & 0xff;
+ desc->flow.qw1.ts[1] = (parms->offload.desc_ts >> 8) & 0xff;
+ desc->flow.qw1.ts[2] = (parms->offload.desc_ts >> 16) & 0xff;
}
/**
@@ -1388,7 +1718,19 @@ iecm_tx_splitq_build_flow_desc(union iecm_tx_flex_desc *desc,
static int
__iecm_tx_maybe_stop(struct iecm_queue *tx_q, unsigned int size)
{
- /* stub */
+ netif_stop_subqueue(tx_q->vport->netdev, tx_q->idx);
+
+ /* Memory barrier before checking head and tail */
+ smp_mb();
+
+ /* Check again in a case another CPU has just made room available. */
+ if (likely(IECM_DESC_UNUSED(tx_q) < size))
+ return -EBUSY;
+
+ /* A reprieve! - use start_subqueue because it doesn't call schedule */
+ netif_start_subqueue(tx_q->vport->netdev, tx_q->idx);
+
+ return 0;
}
/**
@@ -1400,7 +1742,10 @@ __iecm_tx_maybe_stop(struct iecm_queue *tx_q, unsigned int size)
*/
int iecm_tx_maybe_stop(struct iecm_queue *tx_q, unsigned int size)
{
- /* stub */
+ if (likely(IECM_DESC_UNUSED(tx_q) >= size))
+ return 0;
+
+ return __iecm_tx_maybe_stop(tx_q, size);
}
/**
@@ -1412,7 +1757,23 @@ int iecm_tx_maybe_stop(struct iecm_queue *tx_q, unsigned int size)
void iecm_tx_buf_hw_update(struct iecm_queue *tx_q, u32 val,
struct sk_buff *skb)
{
- /* stub */
+ struct netdev_queue *nq;
+
+ nq = netdev_get_tx_queue(tx_q->vport->netdev, tx_q->idx);
+ tx_q->next_to_use = val;
+
+ iecm_tx_maybe_stop(tx_q, IECM_TX_DESC_NEEDED);
+
+ /* 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();
+
+ /* notify HW of packet */
+ if (netif_xmit_stopped(nq) || !netdev_xmit_more())
+ writel_relaxed(val, tx_q->tail);
}
/**
@@ -1445,7 +1806,7 @@ void iecm_tx_buf_hw_update(struct iecm_queue *tx_q, u32 val,
*/
static unsigned int __iecm_tx_desc_count_required(unsigned int size)
{
- /* stub */
+ return ((size * 85) >> 20) + IECM_TX_DESCS_FOR_SKB_DATA_PTR;
}
/**
@@ -1456,13 +1817,26 @@ static unsigned int __iecm_tx_desc_count_required(unsigned int size)
*/
unsigned int iecm_tx_desc_count_required(struct sk_buff *skb)
{
- /* stub */
+ const skb_frag_t *frag = &skb_shinfo(skb)->frags[0];
+ unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
+ unsigned int count = 0, size = skb_headlen(skb);
+
+ for (;;) {
+ count += __iecm_tx_desc_count_required(size);
+
+ if (!nr_frags--)
+ break;
+
+ size = skb_frag_size(frag++);
+ }
+
+ return count;
}
/**
* iecm_tx_splitq_map - Build the Tx flex descriptor
* @tx_q: queue to send buffer on
- * @off: pointer to offload params struct
+ * @parms: pointer to splitq params struct
* @first: first buffer info buffer to use
*
* This function loops over the skb data pointed to by *first
@@ -1471,10 +1845,130 @@ unsigned int iecm_tx_desc_count_required(struct sk_buff *skb)
*/
static void
iecm_tx_splitq_map(struct iecm_queue *tx_q,
- struct iecm_tx_offload_params *off,
+ struct iecm_tx_splitq_params *parms,
struct iecm_tx_buf *first)
{
- /* stub */
+ union iecm_tx_flex_desc *tx_desc;
+ unsigned int data_len, size;
+ struct iecm_tx_buf *tx_buf;
+ u16 i = tx_q->next_to_use;
+ struct netdev_queue *nq;
+ struct sk_buff *skb;
+ skb_frag_t *frag;
+ u16 td_cmd = 0;
+ dma_addr_t dma;
+
+ skb = first->skb;
+
+ td_cmd = parms->offload.td_cmd;
+ parms->compl_tag = tx_q->tx_buf_key;
+
+ data_len = skb->data_len;
+ size = skb_headlen(skb);
+
+ tx_desc = IECM_FLEX_TX_DESC(tx_q, i);
+
+ dma = dma_map_single(tx_q->dev, skb->data, size, DMA_TO_DEVICE);
+
+ tx_buf = first;
+
+ for (frag = &skb_shinfo(skb)->frags[0];; frag++) {
+ unsigned int max_data = IECM_TX_MAX_DESC_DATA_ALIGNED;
+
+ if (dma_mapping_error(tx_q->dev, dma))
+ goto dma_error;
+
+ /* record length, and DMA address */
+ dma_unmap_len_set(tx_buf, len, size);
+ dma_unmap_addr_set(tx_buf, dma, dma);
+
+ /* align size to end of page */
+ max_data += -dma & (IECM_TX_MAX_READ_REQ_SIZE - 1);
+
+ /* buf_addr is in same location for both desc types */
+ tx_desc->q.buf_addr = cpu_to_le64(dma);
+
+ /* account for data chunks larger than the hardware
+ * can handle
+ */
+ while (unlikely(size > IECM_TX_MAX_DESC_DATA)) {
+ parms->splitq_build_ctb(tx_desc, parms, td_cmd, size);
+
+ tx_desc++;
+ i++;
+
+ if (i == tx_q->desc_count) {
+ tx_desc = IECM_FLEX_TX_DESC(tx_q, 0);
+ i = 0;
+ }
+
+ dma += max_data;
+ size -= max_data;
+
+ max_data = IECM_TX_MAX_DESC_DATA_ALIGNED;
+ /* buf_addr is in same location for both desc types */
+ tx_desc->q.buf_addr = cpu_to_le64(dma);
+ }
+
+ if (likely(!data_len))
+ break;
+ parms->splitq_build_ctb(tx_desc, parms, td_cmd, size);
+ tx_desc++;
+ i++;
+
+ if (i == tx_q->desc_count) {
+ tx_desc = IECM_FLEX_TX_DESC(tx_q, 0);
+ i = 0;
+ }
+
+ size = skb_frag_size(frag);
+ data_len -= size;
+
+ dma = skb_frag_dma_map(tx_q->dev, frag, 0, size,
+ DMA_TO_DEVICE);
+
+ tx_buf->compl_tag = parms->compl_tag;
+ tx_buf = &tx_q->tx_buf[i];
+ }
+
+ /* record bytecount for BQL */
+ nq = netdev_get_tx_queue(tx_q->vport->netdev, tx_q->idx);
+ netdev_tx_sent_queue(nq, first->bytecount);
+
+ /* record SW timestamp if HW timestamp is not available */
+ skb_tx_timestamp(first->skb);
+
+ /* write last descriptor with RS and EOP bits */
+ td_cmd |= parms->eop_cmd;
+ parms->splitq_build_ctb(tx_desc, parms, td_cmd, size);
+ i++;
+ if (i == tx_q->desc_count)
+ i = 0;
+
+ /* set next_to_watch value indicating a packet is present */
+ first->next_to_watch = tx_desc;
+ tx_buf->compl_tag = parms->compl_tag++;
+
+ iecm_tx_buf_hw_update(tx_q, i, skb);
+
+ /* Update TXQ Completion Tag key for next buffer */
+ tx_q->tx_buf_key = parms->compl_tag;
+
+ return;
+
+dma_error:
+ /* clear dma mappings for failed tx_buf map */
+ for (;;) {
+ tx_buf = &tx_q->tx_buf[i];
+ iecm_tx_buf_rel(tx_q, tx_buf);
+ if (tx_buf == first)
+ break;
+ if (i == 0)
+ i = tx_q->desc_count;
+ i--;
+ }
+
+ tx_q->next_to_use = i;
}
/**
@@ -1490,7 +1984,79 @@ iecm_tx_splitq_map(struct iecm_queue *tx_q,
static int iecm_tso(struct iecm_tx_buf *first,
struct iecm_tx_offload_params *off)
{
- /* stub */
+ struct sk_buff *skb = first->skb;
+ 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_start;
+ 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;
+ }
+
+ /* determine offset of transport header */
+ l4_start = l4.hdr - skb->data;
+
+ /* remove payload length from checksum */
+ paylen = skb->len - l4_start;
+
+ switch (skb_shinfo(skb)->gso_type) {
+ case SKB_GSO_TCPV4:
+ case SKB_GSO_TCPV6:
+ csum_replace_by_diff(&l4.tcp->check,
+ (__force __wsum)htonl(paylen));
+
+ /* compute length of segmentation header */
+ off->tso_hdr_len = (l4.tcp->doff * 4) + l4_start;
+ break;
+ case SKB_GSO_UDP_L4:
+ csum_replace_by_diff(&l4.udp->check,
+ (__force __wsum)htonl(paylen));
+ /* compute length of segmentation header */
+ off->tso_hdr_len = sizeof(struct udphdr) + l4_start;
+ l4.udp->len =
+ htons(skb_shinfo(skb)->gso_size +
+ sizeof(struct udphdr));
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ off->tso_len = skb->len - off->tso_hdr_len;
+ off->mss = skb_shinfo(skb)->gso_size;
+
+ /* update gso_segs and bytecount */
+ first->gso_segs = skb_shinfo(skb)->gso_segs;
+ first->bytecount += (first->gso_segs - 1) * off->tso_hdr_len;
+
+ first->tx_flags |= IECM_TX_FLAGS_TSO;
+
+ return 0;
}
/**
@@ -1503,7 +2069,84 @@ static int iecm_tso(struct iecm_tx_buf *first,
static netdev_tx_t
iecm_tx_splitq_frame(struct sk_buff *skb, struct iecm_queue *tx_q)
{
- /* stub */
+ struct iecm_tx_splitq_params tx_parms = {0};
+ struct iecm_tx_buf *first;
+ unsigned int count;
+
+ count = iecm_tx_desc_count_required(skb);
+
+ /* need: 1 descriptor per page * PAGE_SIZE/IECM_MAX_DATA_PER_TXD,
+ * + 1 desc for skb_head_len/IECM_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 (iecm_tx_maybe_stop(tx_q, count + IECM_TX_DESCS_PER_CACHE_LINE +
+ IECM_TX_DESCS_FOR_CTX)) {
+ return NETDEV_TX_BUSY;
+ }
+
+ /* record the location of the first descriptor for this packet */
+ first = &tx_q->tx_buf[tx_q->next_to_use];
+ first->skb = skb;
+ first->bytecount = max_t(unsigned int, skb->len, ETH_ZLEN);
+ first->gso_segs = 1;
+ first->tx_flags = 0;
+
+ if (iecm_tso(first, &tx_parms.offload) < 0) {
+ /* If tso returns an error, drop the packet */
+ dev_kfree_skb_any(skb);
+ return NETDEV_TX_OK;
+ }
+
+ if (first->tx_flags & IECM_TX_FLAGS_TSO) {
+ /* If TSO is needed, set up context desc */
+ union iecm_flex_tx_ctx_desc *ctx_desc;
+ int i = tx_q->next_to_use;
+
+ /* grab the next descriptor */
+ ctx_desc = IECM_FLEX_TX_CTX_DESC(tx_q, i);
+ i++;
+ tx_q->next_to_use = (i < tx_q->desc_count) ? i : 0;
+
+ ctx_desc->tso.qw1.cmd_dtype |=
+ cpu_to_le16(IECM_TX_DESC_DTYPE_FLEX_TSO_CTX |
+ IECM_TX_FLEX_CTX_DESC_CMD_TSO);
+ ctx_desc->tso.qw0.flex_tlen =
+ cpu_to_le32(tx_parms.offload.tso_len &
+ IECM_TXD_FLEX_CTX_TLEN_M);
+ ctx_desc->tso.qw0.mss_rt =
+ cpu_to_le16(tx_parms.offload.mss &
+ IECM_TXD_FLEX_CTX_MSS_RT_M);
+ ctx_desc->tso.qw0.hdr_len = tx_parms.offload.tso_hdr_len;
+ }
+
+ if (test_bit(__IECM_Q_FLOW_SCH_EN, tx_q->flags)) {
+ s64 ts_ns = first->skb->skb_mstamp_ns;
+
+ tx_parms.offload.desc_ts =
+ ts_ns >> IECM_TW_TIME_STAMP_GRAN_512_DIV_S;
+
+ tx_parms.dtype = IECM_TX_DESC_DTYPE_FLEX_FLOW_SCHE;
+ tx_parms.splitq_build_ctb = iecm_tx_splitq_build_flow_desc;
+ tx_parms.eop_cmd =
+ IECM_TXD_FLEX_FLOW_CMD_EOP | IECM_TXD_FLEX_FLOW_CMD_RE;
+
+ if (skb->ip_summed == CHECKSUM_PARTIAL)
+ tx_parms.offload.td_cmd |= IECM_TXD_FLEX_FLOW_CMD_CS_EN;
+
+ } else {
+ tx_parms.dtype = IECM_TX_DESC_DTYPE_FLEX_DATA;
+ tx_parms.splitq_build_ctb = iecm_tx_splitq_build_ctb;
+ tx_parms.eop_cmd = IECM_TX_DESC_CMD_EOP | IECM_TX_DESC_CMD_RS;
+
+ if (skb->ip_summed == CHECKSUM_PARTIAL)
+ tx_parms.offload.td_cmd |= IECM_TX_FLEX_DESC_CMD_CS_EN;
+ }
+
+ iecm_tx_splitq_map(tx_q, &tx_parms, first);
+
+ return NETDEV_TX_OK;
}
/**
@@ -1516,7 +2159,18 @@ iecm_tx_splitq_frame(struct sk_buff *skb, struct iecm_queue *tx_q)
netdev_tx_t iecm_tx_splitq_start(struct sk_buff *skb,
struct net_device *netdev)
{
- /* stub */
+ struct iecm_vport *vport = iecm_netdev_to_vport(netdev);
+ struct iecm_queue *tx_q;
+
+ tx_q = vport->txqs[skb->queue_mapping];
+
+ /* hardware can't handle really short frames, hardware padding works
+ * beyond this point
+ */
+ if (skb_put_padto(skb, IECM_TX_MIN_LEN))
+ return NETDEV_TX_OK;
+
+ return iecm_tx_splitq_frame(skb, tx_q);
}
/**
@@ -1531,7 +2185,18 @@ netdev_tx_t iecm_tx_splitq_start(struct sk_buff *skb,
static enum pkt_hash_types iecm_ptype_to_htype(struct iecm_vport *vport,
u16 ptype)
{
- /* stub */
+ struct iecm_rx_ptype_decoded decoded = vport->rx_ptype_lkup[ptype];
+
+ if (!decoded.known)
+ return PKT_HASH_TYPE_NONE;
+ if (decoded.payload_layer == IECM_RX_PTYPE_PAYLOAD_LAYER_PAY4)
+ return PKT_HASH_TYPE_L4;
+ if (decoded.payload_layer == IECM_RX_PTYPE_PAYLOAD_LAYER_PAY3)
+ return PKT_HASH_TYPE_L3;
+ if (decoded.outer_ip == IECM_RX_PTYPE_OUTER_L2)
+ return PKT_HASH_TYPE_L2;
+
+ return PKT_HASH_TYPE_NONE;
}
/**
@@ -1545,7 +2210,17 @@ static void
iecm_rx_hash(struct iecm_queue *rxq, struct sk_buff *skb,
struct iecm_flex_rx_desc *rx_desc, u16 ptype)
{
- /* stub */
+ u32 hash;
+
+ if (!iecm_is_feature_ena(rxq->vport, NETIF_F_RXHASH))
+ return;
+
+ hash = rx_desc->status_err1 |
+ (rx_desc->fflags1 << 8) |
+ (rx_desc->ts_low << 16) |
+ (rx_desc->ff2_mirrid_hash2.hash2 << 24);
+
+ skb_set_hash(skb, hash, iecm_ptype_to_htype(rxq->vport, ptype));
}
/**
@@ -1561,7 +2236,63 @@ static void
iecm_rx_csum(struct iecm_queue *rxq, struct sk_buff *skb,
struct iecm_flex_rx_desc *rx_desc, u16 ptype)
{
- /* stub */
+ struct iecm_rx_ptype_decoded decoded;
+ u8 rx_status_0_qw1, rx_status_0_qw0;
+ bool ipv4, ipv6;
+
+ /* Start with CHECKSUM_NONE and by default csum_level = 0 */
+ skb->ip_summed = CHECKSUM_NONE;
+
+ /* check if Rx checksum is enabled */
+ if (!iecm_is_feature_ena(rxq->vport, NETIF_F_RXCSUM))
+ return;
+
+ rx_status_0_qw1 = rx_desc->status_err0_qw1;
+ /* check if HW has decoded the packet and checksum */
+ if (!(rx_status_0_qw1 & BIT(IECM_RX_FLEX_DESC_STATUS0_L3L4P_S)))
+ return;
+
+ decoded = rxq->vport->rx_ptype_lkup[ptype];
+ if (!(decoded.known && decoded.outer_ip))
+ return;
+
+ ipv4 = (decoded.outer_ip == IECM_RX_PTYPE_OUTER_IP) &&
+ (decoded.outer_ip_ver == IECM_RX_PTYPE_OUTER_IPV4);
+ ipv6 = (decoded.outer_ip == IECM_RX_PTYPE_OUTER_IP) &&
+ (decoded.outer_ip_ver == IECM_RX_PTYPE_OUTER_IPV6);
+
+ if (ipv4 && (rx_status_0_qw1 &
+ (BIT(IECM_RX_FLEX_DESC_STATUS0_XSUM_IPE_S) |
+ BIT(IECM_RX_FLEX_DESC_STATUS0_XSUM_EIPE_S))))
+ goto checksum_fail;
+
+ rx_status_0_qw0 = rx_desc->status_err0_qw0;
+ if (ipv6 && (rx_status_0_qw0 &
+ (BIT(IECM_RX_FLEX_DESC_STATUS0_IPV6EXADD_S))))
+ return;
+
+ /* check for L4 errors and handle packets that were not able to be
+ * checksummed
+ */
+ if (rx_status_0_qw1 & BIT(IECM_RX_FLEX_DESC_STATUS0_XSUM_L4E_S))
+ goto checksum_fail;
+
+ /* Only report checksum unnecessary for ICMP, TCP, UDP, or SCTP */
+ switch (decoded.inner_prot) {
+ case IECM_RX_PTYPE_INNER_PROT_ICMP:
+ case IECM_RX_PTYPE_INNER_PROT_TCP:
+ case IECM_RX_PTYPE_INNER_PROT_UDP:
+ case IECM_RX_PTYPE_INNER_PROT_SCTP:
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ rxq->q_stats.rx.basic_csum++;
+ default:
+ break;
+ }
+ return;
+
+checksum_fail:
+ rxq->q_stats.rx.csum_err++;
+ dev_dbg(rxq->dev, "RX Checksum not available\n");
}
/**
@@ -1577,7 +2308,74 @@ iecm_rx_csum(struct iecm_queue *rxq, struct sk_buff *skb,
static bool iecm_rx_rsc(struct iecm_queue *rxq, struct sk_buff *skb,
struct iecm_flex_rx_desc *rx_desc, u16 ptype)
{
- /* stub */
+ struct iecm_rx_ptype_decoded decoded;
+ u16 rsc_segments, rsc_payload_len;
+ struct ipv6hdr *ipv6h;
+ struct tcphdr *tcph;
+ struct iphdr *ipv4h;
+ bool ipv4, ipv6;
+ u16 hdr_len;
+
+ rsc_payload_len = le32_to_cpu(rx_desc->fmd1_misc.rscseglen);
+ if (!rsc_payload_len)
+ goto rsc_err;
+
+ decoded = rxq->vport->rx_ptype_lkup[ptype];
+ if (!(decoded.known && decoded.outer_ip))
+ goto rsc_err;
+
+ ipv4 = (decoded.outer_ip == IECM_RX_PTYPE_OUTER_IP) &&
+ (decoded.outer_ip_ver == IECM_RX_PTYPE_OUTER_IPV4);
+ ipv6 = (decoded.outer_ip == IECM_RX_PTYPE_OUTER_IP) &&
+ (decoded.outer_ip_ver == IECM_RX_PTYPE_OUTER_IPV6);
+
+ if (!(ipv4 ^ ipv6))
+ goto rsc_err;
+
+ if (ipv4)
+ hdr_len = ETH_HLEN + sizeof(struct tcphdr)
+ + sizeof(struct iphdr);
+ else
+ hdr_len = ETH_HLEN + sizeof(struct tcphdr)
+ + sizeof(struct ipv6hdr);
+
+ rsc_segments = DIV_ROUND_UP(skb->len - hdr_len, rsc_payload_len);
+
+ NAPI_GRO_CB(skb)->count = rsc_segments;
+ skb_shinfo(skb)->gso_size = rsc_payload_len;
+
+ skb_reset_network_header(skb);
+
+ if (ipv4) {
+ ipv4h = ip_hdr(skb);
+ skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
+
+ /* Reset and set transport header offset in skb */
+ skb_set_transport_header(skb, sizeof(struct iphdr));
+ tcph = tcp_hdr(skb);
+
+ /* Compute the TCP pseudo header checksum*/
+ tcph->check =
+ ~tcp_v4_check(skb->len - skb_transport_offset(skb),
+ ipv4h->saddr, ipv4h->daddr, 0);
+ } else {
+ ipv6h = ipv6_hdr(skb);
+ skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
+ skb_set_transport_header(skb, sizeof(struct ipv6hdr));
+ tcph = tcp_hdr(skb);
+ tcph->check =
+ ~tcp_v6_check(skb->len - skb_transport_offset(skb),
+ &ipv6h->saddr, &ipv6h->daddr, 0);
+ }
+
+ tcp_gro_complete(skb);
+
+ /* Map rx qid to the skb*/
+ skb_record_rx_queue(skb, rxq->q_id);
+
+ return true;
+rsc_err:
+ return false;
}
/**
@@ -1589,7 +2387,19 @@ static bool iecm_rx_rsc(struct iecm_queue *rxq, struct sk_buff *skb,
static void iecm_rx_hwtstamp(struct iecm_flex_rx_desc *rx_desc,
struct sk_buff __maybe_unused *skb)
{
- /* stub */
+ u8 ts_lo = rx_desc->ts_low;
+ u32 ts_hi = 0;
+ u64 ts_ns = 0;
+
+ ts_hi = le32_to_cpu(rx_desc->flex_ts.ts_high);
+
+ ts_ns |= ts_lo | ((u64)ts_hi << 8);
+
+ if (ts_ns) {
+ memset(skb_hwtstamps(skb), 0,
+ sizeof(struct skb_shared_hwtstamps));
+ skb_hwtstamps(skb)->hwtstamp = ns_to_ktime(ts_ns);
+ }
}
/**
@@ -1606,7 +2416,26 @@ static bool
iecm_rx_process_skb_fields(struct iecm_queue *rxq, struct sk_buff *skb,
struct iecm_flex_rx_desc *rx_desc)
{
- /* stub */
+ bool err = false;
+ u16 rx_ptype;
+ bool rsc;
+
+ rx_ptype = le16_to_cpu(rx_desc->ptype_err_fflags0) &
+ IECM_RXD_FLEX_PTYPE_M;
+
+ /* modifies the skb - consumes the enet header */
+ skb->protocol = eth_type_trans(skb, rxq->vport->netdev);
+ iecm_rx_csum(rxq, skb, rx_desc, rx_ptype);
+ /* process RSS/hash */
+ iecm_rx_hash(rxq, skb, rx_desc, rx_ptype);
+
+ rsc = le16_to_cpu(rx_desc->hdrlen_flags) & IECM_RXD_FLEX_RSC_M;
+ if (rsc)
+ err = iecm_rx_rsc(rxq, skb, rx_desc, rx_ptype);
+
+ iecm_rx_hwtstamp(rx_desc, skb);
+
+ return err;
}
/**
@@ -1619,7 +2448,7 @@ iecm_rx_process_skb_fields(struct iecm_queue *rxq, struct sk_buff *skb,
*/
void iecm_rx_skb(struct iecm_queue *rxq, struct sk_buff *skb)
{
- /* stub */
+ napi_gro_receive(&rxq->q_vector->napi, skb);
}
/**
@@ -1628,7 +2457,7 @@ void iecm_rx_skb(struct iecm_queue *rxq, struct sk_buff *skb)
*/
static bool iecm_rx_page_is_reserved(struct page *page)
{
- /* stub */
+ return (page_to_nid(page) != numa_mem_id()) || page_is_pfmemalloc(page);
}
/**
@@ -1644,7 +2473,13 @@ static bool iecm_rx_page_is_reserved(struct page *page)
static void
iecm_rx_buf_adjust_pg_offset(struct iecm_rx_buf *rx_buf, unsigned int size)
{
- /* stub */
+#if (PAGE_SIZE < 8192)
+ /* flip page offset to other buffer */
+ rx_buf->page_offset ^= size;
+#else
+ /* move offset up to the next cache line */
+ rx_buf->page_offset += size;
+#endif
}
/**
@@ -1658,7 +2493,34 @@ iecm_rx_buf_adjust_pg_offset(struct iecm_rx_buf *rx_buf, unsigned int size)
*/
static bool iecm_rx_can_reuse_page(struct iecm_rx_buf *rx_buf)
{
- /* stub */
+#if (PAGE_SIZE >= 8192)
+#endif
+ unsigned int pagecnt_bias = rx_buf->pagecnt_bias;
+ struct page *page = rx_buf->page;
+
+ /* avoid re-using remote pages */
+ if (unlikely(iecm_rx_page_is_reserved(page)))
+ return false;
+
+#if (PAGE_SIZE < 8192)
+ /* if we are only owner of page we can reuse it */
+ if (unlikely((page_count(page) - pagecnt_bias) > 1))
+ return false;
+#else
+ if (rx_buf->page_offset > last_offset)
+ return false;
+#endif /* PAGE_SIZE < 8192) */
+
+ /* If we have drained the page fragment pool we need to update
+ * the pagecnt_bias and page count so that we fully restock the
+ * number of references the driver holds.
+ */
+ if (unlikely(pagecnt_bias == 1)) {
+ page_ref_add(page, USHRT_MAX - 1);
+ rx_buf->pagecnt_bias = USHRT_MAX;
+ }
+
+ return true;
}
/**
@@ -1674,7 +2536,17 @@ static bool iecm_rx_can_reuse_page(struct iecm_rx_buf *rx_buf)
void iecm_rx_add_frag(struct iecm_rx_buf *rx_buf, struct sk_buff *skb,
unsigned int size)
{
- /* stub */
+#if (PAGE_SIZE >= 8192)
+ unsigned int truesize = SKB_DATA_ALIGN(size);
+#else
+ unsigned int truesize = IECM_RX_BUF_2048;
+#endif
+
+ skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, rx_buf->page,
+ rx_buf->page_offset, size, truesize);
+
+ /* page is being used so we must update the page offset */
+ iecm_rx_buf_adjust_pg_offset(rx_buf, truesize);
}
/**
@@ -1689,7 +2561,22 @@ void iecm_rx_reuse_page(struct iecm_queue *rx_bufq,
bool hsplit,
struct iecm_rx_buf *old_buf)
{
- /* stub */
+ u16 ntu = rx_bufq->next_to_use;
+ struct iecm_rx_buf *new_buf;
+
+ if (hsplit)
+ new_buf = &rx_bufq->rx_buf.hdr_buf[ntu];
+ else
+ new_buf = &rx_bufq->rx_buf.buf[ntu];
+
+ /* Transfer page from old buffer to new buffer.
+ * Move each member individually to avoid possible store
+ * forwarding stalls and unnecessary copy of skb.
+ */
+ new_buf->dma = old_buf->dma;
+ new_buf->page = old_buf->page;
+ new_buf->page_offset = old_buf->page_offset;
+ new_buf->pagecnt_bias = old_buf->pagecnt_bias;
}
/**
@@ -1704,7 +2591,15 @@ static void
iecm_rx_get_buf_page(struct device *dev, struct iecm_rx_buf *rx_buf,
const unsigned int size)
{
- /* stub */
+ prefetch(rx_buf->page);
+
+ /* we are reusing so sync this buffer for CPU use */
+ dma_sync_single_range_for_cpu(dev, rx_buf->dma,
+ rx_buf->page_offset, size,
+ DMA_FROM_DEVICE);
+
+ /* We have pulled a buffer for use, so decrement pagecnt_bias */
+ rx_buf->pagecnt_bias--;
}
/**
@@ -1721,7 +2616,52 @@ struct sk_buff *
iecm_rx_construct_skb(struct iecm_queue *rxq, struct iecm_rx_buf *rx_buf,
unsigned int size)
{
- /* stub */
+ void *va = page_address(rx_buf->page) + rx_buf->page_offset;
+ unsigned int headlen;
+ struct sk_buff *skb;
+
+ /* prefetch first cache line of first page */
+ prefetch(va);
+#if L1_CACHE_BYTES < 128
+ prefetch((u8 *)va + L1_CACHE_BYTES);
+#endif /* L1_CACHE_BYTES */
+ /* allocate a skb to store the frags */
+ skb = __napi_alloc_skb(&rxq->q_vector->napi, IECM_RX_HDR_SIZE,
+ GFP_ATOMIC | __GFP_NOWARN);
+ if (unlikely(!skb))
+ return NULL;
+
+ skb_record_rx_queue(skb, rxq->idx);
+
+ /* Determine available headroom for copy */
+ headlen = size;
+ if (headlen > IECM_RX_HDR_SIZE)
+ headlen = eth_get_headlen(skb->dev, va, IECM_RX_HDR_SIZE);
+
+ /* align pull length to size of long to optimize memcpy performance */
+ memcpy(__skb_put(skb, headlen), va, ALIGN(headlen, sizeof(long)));
+
+ /* if we exhaust the linear part then add what is left as a frag */
+ size -= headlen;
+ if (size) {
+#if (PAGE_SIZE >= 8192)
+ unsigned int truesize = SKB_DATA_ALIGN(size);
+#else
+ unsigned int truesize = IECM_RX_BUF_2048;
+#endif
+ skb_add_rx_frag(skb, 0, rx_buf->page,
+ rx_buf->page_offset + headlen, size, truesize);
+ /* buffer is used by skb, update page_offset */
+ iecm_rx_buf_adjust_pg_offset(rx_buf, truesize);
+ } else {
+ /* buffer is unused, reset bias back to rx_buf; data was copied
+ * onto skb's linear part so there's no need for adjusting
+ * page offset and we can reuse this buffer as-is
+ */
+ rx_buf->pagecnt_bias++;
+ }
+
+ return skb;
}
/**
@@ -1738,7 +2678,11 @@ iecm_rx_construct_skb(struct iecm_queue *rxq, struct iecm_rx_buf *rx_buf,
*/
bool iecm_rx_cleanup_headers(struct sk_buff *skb)
{
- /* stub */
+ /* if eth_skb_pad returns an error the skb was freed */
+ if (eth_skb_pad(skb))
+ return true;
+
+ return false;
}
/**
@@ -1751,7 +2695,7 @@ bool iecm_rx_cleanup_headers(struct sk_buff *skb)
static bool
iecm_rx_splitq_test_staterr(u8 stat_err_field, const u8 stat_err_bits)
{
- /* stub */
+ return !!(stat_err_field & stat_err_bits);
}
/**
@@ -1764,7 +2708,13 @@ iecm_rx_splitq_test_staterr(u8 stat_err_field, const u8 stat_err_bits)
static bool
iecm_rx_splitq_is_non_eop(struct iecm_flex_rx_desc *rx_desc)
{
- /* stub */
+ /* if we are the last buffer then there is nothing else to do */
+#define IECM_RXD_EOF BIT(IECM_RX_FLEX_DESC_STATUS0_EOF_S)
+ if (likely(iecm_rx_splitq_test_staterr(rx_desc->status_err0_qw1,
+ IECM_RXD_EOF)))
+ return false;
+
+ return true;
}
/**
@@ -1781,7 +2731,24 @@ iecm_rx_splitq_is_non_eop(struct iecm_flex_rx_desc *rx_desc)
bool iecm_rx_recycle_buf(struct iecm_queue *rx_bufq, bool hsplit,
struct iecm_rx_buf *rx_buf)
{
- /* stub */
+ bool recycled = false;
+
+ if (iecm_rx_can_reuse_page(rx_buf)) {
+ /* hand second half of page back to the queue */
+ iecm_rx_reuse_page(rx_bufq, hsplit, rx_buf);
+ recycled = true;
+ } else {
+ /* we are not reusing the buffer so unmap it */
+ dma_unmap_page_attrs(rx_bufq->dev, rx_buf->dma, PAGE_SIZE,
+ DMA_FROM_DEVICE, IECM_RX_DMA_ATTR);
+ __page_frag_cache_drain(rx_buf->page, rx_buf->pagecnt_bias);
+ }
+
+ /* clear contents of buffer_info */
+ rx_buf->page = NULL;
+ rx_buf->skb = NULL;
+
+ return recycled;
}
/**
@@ -1797,7 +2764,19 @@ static void iecm_rx_splitq_put_bufs(struct iecm_queue *rx_bufq,
struct iecm_rx_buf *hdr_buf,
struct iecm_rx_buf *rx_buf)
{
- /* stub */
+ u16 ntu = rx_bufq->next_to_use;
+ bool recycled = false;
+
+ if (likely(hdr_buf))
+ recycled = iecm_rx_recycle_buf(rx_bufq, true, hdr_buf);
+ if (likely(rx_buf))
+ recycled = iecm_rx_recycle_buf(rx_bufq, false, rx_buf);
+
+ /* update, and store next to alloc if the buffer was recycled */
+ if (recycled) {
+ ntu++;
+ rx_bufq->next_to_use = (ntu < rx_bufq->desc_count) ? ntu : 0;
+ }
}
/**
@@ -1806,7 +2785,14 @@ static void iecm_rx_splitq_put_bufs(struct iecm_queue *rx_bufq,
*/
static void iecm_rx_bump_ntc(struct iecm_queue *q)
{
- /* stub */
+ u16 ntc = q->next_to_clean + 1;
+ /* fetch, update, and store next to clean */
+ if (ntc < q->desc_count) {
+ q->next_to_clean = ntc;
+ } else {
+ q->next_to_clean = 0;
+ change_bit(__IECM_Q_GEN_CHK, q->flags);
+ }
}
/**
@@ -1823,7 +2809,158 @@ static void iecm_rx_bump_ntc(struct iecm_queue *q)
*/
static int iecm_rx_splitq_clean(struct iecm_queue *rxq, int budget)
{
- /* stub */
+ unsigned int total_rx_bytes = 0, total_rx_pkts = 0;
+ u16 cleaned_count[IECM_BUFQS_PER_RXQ_SET] = {0};
+ struct iecm_queue *rx_bufq = NULL;
+ struct sk_buff *skb = rxq->skb;
+ bool failure = false;
+ int i;
+
+ /* Process Rx packets bounded by budget */
+ while (likely(total_rx_pkts < (unsigned int)budget)) {
+ struct iecm_flex_rx_desc *splitq_flex_rx_desc;
+ union iecm_rx_desc *rx_desc;
+ struct iecm_rx_buf *hdr_buf = NULL;
+ struct iecm_rx_buf *rx_buf = NULL;
+ unsigned int pkt_len = 0;
+ unsigned int hdr_len = 0;
+ u16 gen_id, buf_id;
+ u8 stat_err0_qw0;
+ u8 stat_err_bits;
+ /* Header buffer overflow only valid for header split */
+ bool hbo = false;
+ int bufq_id;
+
+ /* get the Rx desc from Rx queue based on 'next_to_clean' */
+ rx_desc = IECM_RX_DESC(rxq, rxq->next_to_clean);
+ splitq_flex_rx_desc = (struct iecm_flex_rx_desc *)rx_desc;
+
+ /* This memory barrier is needed to keep us from reading
+ * any other fields out of the rx_desc
+ */
+ dma_rmb();
+
+ /* if the descriptor isn't done, no work yet to do */
+ gen_id = le16_to_cpu(splitq_flex_rx_desc->pktlen_gen_bufq_id);
+ gen_id = (gen_id & IECM_RXD_FLEX_GEN_M) >> IECM_RXD_FLEX_GEN_S;
+ if (test_bit(__IECM_Q_GEN_CHK, rxq->flags) != gen_id)
+ break;
+
+ pkt_len = le16_to_cpu(splitq_flex_rx_desc->pktlen_gen_bufq_id) &
+ IECM_RXD_FLEX_LEN_PBUF_M;
+
+ hbo = le16_to_cpu(splitq_flex_rx_desc->status_err0_qw1) &
+ BIT(IECM_RX_FLEX_DESC_STATUS0_HBO_S);
+
+ if (unlikely(hbo)) {
+ rxq->q_stats.rx.hsplit_hbo++;
+ goto bypass_hsplit;
+ }
+
+ hdr_len =
+ le16_to_cpu(splitq_flex_rx_desc->hdrlen_flags) &
+ IECM_RXD_FLEX_LEN_HDR_M;
+
+bypass_hsplit:
+ bufq_id = le16_to_cpu(splitq_flex_rx_desc->pktlen_gen_bufq_id);
+ bufq_id = (bufq_id & IECM_RXD_FLEX_BUFQ_ID_M) >>
+ IECM_RXD_FLEX_BUFQ_ID_S;
+ /* retrieve buffer from the rxq */
+ rx_bufq = &rxq->rxq_grp->splitq.bufq_sets[bufq_id].bufq;
+
+ buf_id = le16_to_cpu(splitq_flex_rx_desc->fmd0_bufid.buf_id);
+
+ if (pkt_len) {
+ rx_buf = &rx_bufq->rx_buf.buf[buf_id];
+ iecm_rx_get_buf_page(rx_bufq->dev, rx_buf, pkt_len);
+ }
+
+ if (hdr_len) {
+ hdr_buf = &rx_bufq->rx_buf.hdr_buf[buf_id];
+ iecm_rx_get_buf_page(rx_bufq->dev, hdr_buf,
+ hdr_len);
+
+ skb = iecm_rx_construct_skb(rxq, hdr_buf, hdr_len);
+ }
+
+ if (skb && pkt_len)
+ iecm_rx_add_frag(rx_buf, skb, pkt_len);
+ else if (pkt_len)
+ skb = iecm_rx_construct_skb(rxq, rx_buf, pkt_len);
+
+ /* exit if we failed to retrieve a buffer */
+ if (!skb) {
+ /* If we fetched a buffer, but didn't use it
+ * undo pagecnt_bias decrement
+ */
+ if (rx_buf)
+ rx_buf->pagecnt_bias++;
+ break;
+ }
+
+ iecm_rx_splitq_put_bufs(rx_bufq, hdr_buf, rx_buf);
+ iecm_rx_bump_ntc(rxq);
+ cleaned_count[bufq_id]++;
+
+ /* skip if it is non EOP desc */
+ if (iecm_rx_splitq_is_non_eop(splitq_flex_rx_desc))
+ continue;
+
+ stat_err_bits = BIT(IECM_RX_FLEX_DESC_STATUS0_RXE_S);
+ stat_err0_qw0 = splitq_flex_rx_desc->status_err0_qw0;
+ if (unlikely(iecm_rx_splitq_test_staterr(stat_err0_qw0,
+ stat_err_bits))) {
+ dev_kfree_skb_any(skb);
+ skb = NULL;
+ continue;
+ }
+
+ /* correct empty headers and pad skb if needed (to make valid
+ * Ethernet frame
+ */
+ if (iecm_rx_cleanup_headers(skb)) {
+ skb = NULL;
+ continue;
+ }
+
+ /* probably a little skewed due to removing CRC */
+ total_rx_bytes += skb->len;
+
+ /* protocol */
+ if (unlikely(iecm_rx_process_skb_fields(rxq, skb,
+ splitq_flex_rx_desc))) {
+ dev_kfree_skb_any(skb);
+ skb = NULL;
+ continue;
+ }
+
+ /* send completed skb up the stack */
+ iecm_rx_skb(rxq, skb);
+ skb = NULL;
+
+ /* update budget accounting */
+ total_rx_pkts++;
+ }
+ for (i = 0; i < IECM_BUFQS_PER_RXQ_SET; i++) {
+ if (cleaned_count[i]) {
+ rx_bufq = &rxq->rxq_grp->splitq.bufq_sets[i].bufq;
+ failure = iecm_rx_buf_hw_alloc_all(rx_bufq,
+ cleaned_count[i]) ||
+ failure;
+ }
+ }
+
+ rxq->skb = skb;
+ u64_stats_update_begin(&rxq->stats_sync);
+ rxq->q_stats.rx.packets += total_rx_pkts;
+ rxq->q_stats.rx.bytes += total_rx_bytes;
+ u64_stats_update_end(&rxq->stats_sync);
+
+ rxq->itr.stats.rx.packets += total_rx_pkts;
+ rxq->itr.stats.rx.bytes += total_rx_bytes;
+
+ /* guarantee a trip back through this routine if there was a failure */
+ return failure ? budget : (int)total_rx_pkts;
}
/**
@@ -2379,7 +3516,15 @@ iecm_vport_intr_napi_ena_all(struct iecm_vport *vport)
static inline bool
iecm_tx_splitq_clean_all(struct iecm_q_vector *q_vec, int budget)
{
- /* stub */
+ bool clean_complete = true;
+ int i, budget_per_q;
+
+ budget_per_q = max(budget / q_vec->num_txq, 1);
+ for (i = 0; i < q_vec->num_txq; i++) {
+ if (!iecm_tx_clean_complq(q_vec->tx[i], budget_per_q))
+ clean_complete = false;
+ }
+ return clean_complete;
}
/**
@@ -2394,7 +3539,22 @@ static inline bool
iecm_rx_splitq_clean_all(struct iecm_q_vector *q_vec, int budget,
int *cleaned)
{
- /* stub */
+ bool clean_complete = true;
+ int pkts_cleaned_per_q;
+ int i, budget_per_q;
+
+ budget_per_q = max(budget / q_vec->num_rxq, 1);
+ for (i = 0; i < q_vec->num_rxq; i++) {
+ pkts_cleaned_per_q = iecm_rx_splitq_clean(q_vec->rx[i],
+ budget_per_q);
+ /* if we clean as many as budgeted, we must not
+ * be done
+ */
+ if (pkts_cleaned_per_q >= budget_per_q)
+ clean_complete = false;
+ *cleaned += pkts_cleaned_per_q;
+ }
+ return clean_complete;
}
/**
@@ -2404,7 +3564,34 @@ iecm_rx_splitq_clean_all(struct iecm_q_vector *q_vec, int budget,
*/
int iecm_vport_splitq_napi_poll(struct napi_struct *napi, int budget)
{
- /* stub */
+ struct iecm_q_vector *q_vector =
+ container_of(napi, struct iecm_q_vector, napi);
+ bool clean_complete;
+ int work_done = 0;
+
+ clean_complete = iecm_tx_splitq_clean_all(q_vector, budget);
+
+ /* Handle case where we are called by netpoll with a budget of 0 */
+ if (budget <= 0)
+ return budget;
+
+ /* 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.
+ */
+ clean_complete |= iecm_rx_splitq_clean_all(q_vector, budget,
+ &work_done);
+
+ /* If work not completed, return budget and polling will return */
+ if (!clean_complete)
+ return budget;
+
+ /* Exit the polling mode, but don't re-enable interrupts if stack might
+ * poll us due to busy-polling
+ */
+ if (likely(napi_complete_done(napi, work_done)))
+ iecm_vport_intr_update_itr_ena_irq(q_vector);
+
+ return min_t(int, work_done, budget - 1);
}
/**
--
2.26.2
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