diff options
Diffstat (limited to 'drivers/net/ethernet/fungible/funeth/funeth_tx.c')
| -rw-r--r-- | drivers/net/ethernet/fungible/funeth/funeth_tx.c | 801 |
1 files changed, 801 insertions, 0 deletions
diff --git a/drivers/net/ethernet/fungible/funeth/funeth_tx.c b/drivers/net/ethernet/fungible/funeth/funeth_tx.c new file mode 100644 index 000000000..706d81e39 --- /dev/null +++ b/drivers/net/ethernet/fungible/funeth/funeth_tx.c @@ -0,0 +1,801 @@ +// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) + +#include <linux/dma-mapping.h> +#include <linux/ip.h> +#include <linux/pci.h> +#include <linux/skbuff.h> +#include <linux/tcp.h> +#include <uapi/linux/udp.h> +#include "funeth.h" +#include "funeth_ktls.h" +#include "funeth_txrx.h" +#include "funeth_trace.h" +#include "fun_queue.h" + +#define FUN_XDP_CLEAN_THRES 32 +#define FUN_XDP_CLEAN_BATCH 16 + +/* DMA-map a packet and return the (length, DMA_address) pairs for its + * segments. If a mapping error occurs -ENOMEM is returned. The packet + * consists of an skb_shared_info and one additional address/length pair. + */ +static int fun_map_pkt(struct device *dev, const struct skb_shared_info *si, + void *data, unsigned int data_len, + dma_addr_t *addr, unsigned int *len) +{ + const skb_frag_t *fp, *end; + + *len = data_len; + *addr = dma_map_single(dev, data, *len, DMA_TO_DEVICE); + if (dma_mapping_error(dev, *addr)) + return -ENOMEM; + + if (!si) + return 0; + + for (fp = si->frags, end = fp + si->nr_frags; fp < end; fp++) { + *++len = skb_frag_size(fp); + *++addr = skb_frag_dma_map(dev, fp, 0, *len, DMA_TO_DEVICE); + if (dma_mapping_error(dev, *addr)) + goto unwind; + } + return 0; + +unwind: + while (fp-- > si->frags) + dma_unmap_page(dev, *--addr, skb_frag_size(fp), DMA_TO_DEVICE); + + dma_unmap_single(dev, addr[-1], data_len, DMA_TO_DEVICE); + return -ENOMEM; +} + +/* Return the address just past the end of a Tx queue's descriptor ring. + * It exploits the fact that the HW writeback area is just after the end + * of the descriptor ring. + */ +static void *txq_end(const struct funeth_txq *q) +{ + return (void *)q->hw_wb; +} + +/* Return the amount of space within a Tx ring from the given address to the + * end. + */ +static unsigned int txq_to_end(const struct funeth_txq *q, void *p) +{ + return txq_end(q) - p; +} + +/* Return the number of Tx descriptors occupied by a Tx request. */ +static unsigned int tx_req_ndesc(const struct fun_eth_tx_req *req) +{ + return DIV_ROUND_UP(req->len8, FUNETH_SQE_SIZE / 8); +} + +/* Write a gather list to the Tx descriptor at @req from @ngle address/length + * pairs. + */ +static struct fun_dataop_gl *fun_write_gl(const struct funeth_txq *q, + struct fun_eth_tx_req *req, + const dma_addr_t *addrs, + const unsigned int *lens, + unsigned int ngle) +{ + struct fun_dataop_gl *gle; + unsigned int i; + + req->len8 = (sizeof(*req) + ngle * sizeof(*gle)) / 8; + + for (i = 0, gle = (struct fun_dataop_gl *)req->dataop.imm; + i < ngle && txq_to_end(q, gle); i++, gle++) + fun_dataop_gl_init(gle, 0, 0, lens[i], addrs[i]); + + if (txq_to_end(q, gle) == 0) { + gle = (struct fun_dataop_gl *)q->desc; + for ( ; i < ngle; i++, gle++) + fun_dataop_gl_init(gle, 0, 0, lens[i], addrs[i]); + } + + return gle; +} + +static __be16 tcp_hdr_doff_flags(const struct tcphdr *th) +{ + return *(__be16 *)&tcp_flag_word(th); +} + +static struct sk_buff *fun_tls_tx(struct sk_buff *skb, struct funeth_txq *q, + unsigned int *tls_len) +{ +#if IS_ENABLED(CONFIG_TLS_DEVICE) + const struct fun_ktls_tx_ctx *tls_ctx; + u32 datalen, seq; + + datalen = skb->len - skb_tcp_all_headers(skb); + if (!datalen) + return skb; + + if (likely(!tls_offload_tx_resync_pending(skb->sk))) { + seq = ntohl(tcp_hdr(skb)->seq); + tls_ctx = tls_driver_ctx(skb->sk, TLS_OFFLOAD_CTX_DIR_TX); + + if (likely(tls_ctx->next_seq == seq)) { + *tls_len = datalen; + return skb; + } + if (seq - tls_ctx->next_seq < U32_MAX / 4) { + tls_offload_tx_resync_request(skb->sk, seq, + tls_ctx->next_seq); + } + } + + FUN_QSTAT_INC(q, tx_tls_fallback); + skb = tls_encrypt_skb(skb); + if (!skb) + FUN_QSTAT_INC(q, tx_tls_drops); + + return skb; +#else + return NULL; +#endif +} + +/* Write as many descriptors as needed for the supplied skb starting at the + * current producer location. The caller has made certain enough descriptors + * are available. + * + * Returns the number of descriptors written, 0 on error. + */ +static unsigned int write_pkt_desc(struct sk_buff *skb, struct funeth_txq *q, + unsigned int tls_len) +{ + unsigned int extra_bytes = 0, extra_pkts = 0; + unsigned int idx = q->prod_cnt & q->mask; + const struct skb_shared_info *shinfo; + unsigned int lens[MAX_SKB_FRAGS + 1]; + dma_addr_t addrs[MAX_SKB_FRAGS + 1]; + struct fun_eth_tx_req *req; + struct fun_dataop_gl *gle; + const struct tcphdr *th; + unsigned int l4_hlen; + unsigned int ngle; + u16 flags; + + shinfo = skb_shinfo(skb); + if (unlikely(fun_map_pkt(q->dma_dev, shinfo, skb->data, + skb_headlen(skb), addrs, lens))) { + FUN_QSTAT_INC(q, tx_map_err); + return 0; + } + + req = fun_tx_desc_addr(q, idx); + req->op = FUN_ETH_OP_TX; + req->len8 = 0; + req->flags = 0; + req->suboff8 = offsetof(struct fun_eth_tx_req, dataop); + req->repr_idn = 0; + req->encap_proto = 0; + + if (likely(shinfo->gso_size)) { + if (skb->encapsulation) { + u16 ol4_ofst; + + flags = FUN_ETH_OUTER_EN | FUN_ETH_INNER_LSO | + FUN_ETH_UPDATE_INNER_L4_CKSUM | + FUN_ETH_UPDATE_OUTER_L3_LEN; + if (shinfo->gso_type & (SKB_GSO_UDP_TUNNEL | + SKB_GSO_UDP_TUNNEL_CSUM)) { + flags |= FUN_ETH_UPDATE_OUTER_L4_LEN | + FUN_ETH_OUTER_UDP; + if (shinfo->gso_type & SKB_GSO_UDP_TUNNEL_CSUM) + flags |= FUN_ETH_UPDATE_OUTER_L4_CKSUM; + ol4_ofst = skb_transport_offset(skb); + } else { + ol4_ofst = skb_inner_network_offset(skb); + } + + if (ip_hdr(skb)->version == 4) + flags |= FUN_ETH_UPDATE_OUTER_L3_CKSUM; + else + flags |= FUN_ETH_OUTER_IPV6; + + if (skb->inner_network_header) { + if (inner_ip_hdr(skb)->version == 4) + flags |= FUN_ETH_UPDATE_INNER_L3_CKSUM | + FUN_ETH_UPDATE_INNER_L3_LEN; + else + flags |= FUN_ETH_INNER_IPV6 | + FUN_ETH_UPDATE_INNER_L3_LEN; + } + th = inner_tcp_hdr(skb); + l4_hlen = __tcp_hdrlen(th); + fun_eth_offload_init(&req->offload, flags, + shinfo->gso_size, + tcp_hdr_doff_flags(th), 0, + skb_inner_network_offset(skb), + skb_inner_transport_offset(skb), + skb_network_offset(skb), ol4_ofst); + FUN_QSTAT_INC(q, tx_encap_tso); + } else if (shinfo->gso_type & SKB_GSO_UDP_L4) { + flags = FUN_ETH_INNER_LSO | FUN_ETH_INNER_UDP | + FUN_ETH_UPDATE_INNER_L4_CKSUM | + FUN_ETH_UPDATE_INNER_L4_LEN | + FUN_ETH_UPDATE_INNER_L3_LEN; + + if (ip_hdr(skb)->version == 4) + flags |= FUN_ETH_UPDATE_INNER_L3_CKSUM; + else + flags |= FUN_ETH_INNER_IPV6; + + l4_hlen = sizeof(struct udphdr); + fun_eth_offload_init(&req->offload, flags, + shinfo->gso_size, + cpu_to_be16(l4_hlen << 10), 0, + skb_network_offset(skb), + skb_transport_offset(skb), 0, 0); + FUN_QSTAT_INC(q, tx_uso); + } else { + /* HW considers one set of headers as inner */ + flags = FUN_ETH_INNER_LSO | + FUN_ETH_UPDATE_INNER_L4_CKSUM | + FUN_ETH_UPDATE_INNER_L3_LEN; + if (shinfo->gso_type & SKB_GSO_TCPV6) + flags |= FUN_ETH_INNER_IPV6; + else + flags |= FUN_ETH_UPDATE_INNER_L3_CKSUM; + th = tcp_hdr(skb); + l4_hlen = __tcp_hdrlen(th); + fun_eth_offload_init(&req->offload, flags, + shinfo->gso_size, + tcp_hdr_doff_flags(th), 0, + skb_network_offset(skb), + skb_transport_offset(skb), 0, 0); + FUN_QSTAT_INC(q, tx_tso); + } + + u64_stats_update_begin(&q->syncp); + q->stats.tx_cso += shinfo->gso_segs; + u64_stats_update_end(&q->syncp); + + extra_pkts = shinfo->gso_segs - 1; + extra_bytes = (be16_to_cpu(req->offload.inner_l4_off) + + l4_hlen) * extra_pkts; + } else if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) { + flags = FUN_ETH_UPDATE_INNER_L4_CKSUM; + if (skb->csum_offset == offsetof(struct udphdr, check)) + flags |= FUN_ETH_INNER_UDP; + fun_eth_offload_init(&req->offload, flags, 0, 0, 0, 0, + skb_checksum_start_offset(skb), 0, 0); + FUN_QSTAT_INC(q, tx_cso); + } else { + fun_eth_offload_init(&req->offload, 0, 0, 0, 0, 0, 0, 0, 0); + } + + ngle = shinfo->nr_frags + 1; + req->dataop = FUN_DATAOP_HDR_INIT(ngle, 0, ngle, 0, skb->len); + + gle = fun_write_gl(q, req, addrs, lens, ngle); + + if (IS_ENABLED(CONFIG_TLS_DEVICE) && unlikely(tls_len)) { + struct fun_eth_tls *tls = (struct fun_eth_tls *)gle; + struct fun_ktls_tx_ctx *tls_ctx; + + req->len8 += FUNETH_TLS_SZ / 8; + req->flags = cpu_to_be16(FUN_ETH_TX_TLS); + + tls_ctx = tls_driver_ctx(skb->sk, TLS_OFFLOAD_CTX_DIR_TX); + tls->tlsid = tls_ctx->tlsid; + tls_ctx->next_seq += tls_len; + + u64_stats_update_begin(&q->syncp); + q->stats.tx_tls_bytes += tls_len; + q->stats.tx_tls_pkts += 1 + extra_pkts; + u64_stats_update_end(&q->syncp); + } + + u64_stats_update_begin(&q->syncp); + q->stats.tx_bytes += skb->len + extra_bytes; + q->stats.tx_pkts += 1 + extra_pkts; + u64_stats_update_end(&q->syncp); + + q->info[idx].skb = skb; + + trace_funeth_tx(q, skb->len, idx, req->dataop.ngather); + return tx_req_ndesc(req); +} + +/* Return the number of available descriptors of a Tx queue. + * HW assumes head==tail means the ring is empty so we need to keep one + * descriptor unused. + */ +static unsigned int fun_txq_avail(const struct funeth_txq *q) +{ + return q->mask - q->prod_cnt + q->cons_cnt; +} + +/* Stop a queue if it can't handle another worst-case packet. */ +static void fun_tx_check_stop(struct funeth_txq *q) +{ + if (likely(fun_txq_avail(q) >= FUNETH_MAX_PKT_DESC)) + return; + + netif_tx_stop_queue(q->ndq); + + /* NAPI reclaim is freeing packets in parallel with us and we may race. + * We have stopped the queue but check again after synchronizing with + * reclaim. + */ + smp_mb(); + if (likely(fun_txq_avail(q) < FUNETH_MAX_PKT_DESC)) + FUN_QSTAT_INC(q, tx_nstops); + else + netif_tx_start_queue(q->ndq); +} + +/* Return true if a queue has enough space to restart. Current condition is + * that the queue must be >= 1/4 empty. + */ +static bool fun_txq_may_restart(struct funeth_txq *q) +{ + return fun_txq_avail(q) >= q->mask / 4; +} + +netdev_tx_t fun_start_xmit(struct sk_buff *skb, struct net_device *netdev) +{ + struct funeth_priv *fp = netdev_priv(netdev); + unsigned int qid = skb_get_queue_mapping(skb); + struct funeth_txq *q = fp->txqs[qid]; + unsigned int tls_len = 0; + unsigned int ndesc; + + if (IS_ENABLED(CONFIG_TLS_DEVICE) && skb->sk && + tls_is_sk_tx_device_offloaded(skb->sk)) { + skb = fun_tls_tx(skb, q, &tls_len); + if (unlikely(!skb)) + goto dropped; + } + + ndesc = write_pkt_desc(skb, q, tls_len); + if (unlikely(!ndesc)) { + dev_kfree_skb_any(skb); + goto dropped; + } + + q->prod_cnt += ndesc; + fun_tx_check_stop(q); + + skb_tx_timestamp(skb); + + if (__netdev_tx_sent_queue(q->ndq, skb->len, netdev_xmit_more())) + fun_txq_wr_db(q); + else + FUN_QSTAT_INC(q, tx_more); + + return NETDEV_TX_OK; + +dropped: + /* A dropped packet may be the last one in a xmit_more train, + * ring the doorbell just in case. + */ + if (!netdev_xmit_more()) + fun_txq_wr_db(q); + return NETDEV_TX_OK; +} + +/* Return a Tx queue's HW head index written back to host memory. */ +static u16 txq_hw_head(const struct funeth_txq *q) +{ + return (u16)be64_to_cpu(*q->hw_wb); +} + +/* Unmap the Tx packet starting at the given descriptor index and + * return the number of Tx descriptors it occupied. + */ +static unsigned int fun_unmap_pkt(const struct funeth_txq *q, unsigned int idx) +{ + const struct fun_eth_tx_req *req = fun_tx_desc_addr(q, idx); + unsigned int ngle = req->dataop.ngather; + struct fun_dataop_gl *gle; + + if (ngle) { + gle = (struct fun_dataop_gl *)req->dataop.imm; + dma_unmap_single(q->dma_dev, be64_to_cpu(gle->sgl_data), + be32_to_cpu(gle->sgl_len), DMA_TO_DEVICE); + + for (gle++; --ngle && txq_to_end(q, gle); gle++) + dma_unmap_page(q->dma_dev, be64_to_cpu(gle->sgl_data), + be32_to_cpu(gle->sgl_len), + DMA_TO_DEVICE); + + for (gle = (struct fun_dataop_gl *)q->desc; ngle; ngle--, gle++) + dma_unmap_page(q->dma_dev, be64_to_cpu(gle->sgl_data), + be32_to_cpu(gle->sgl_len), + DMA_TO_DEVICE); + } + + return tx_req_ndesc(req); +} + +/* Reclaim completed Tx descriptors and free their packets. Restart a stopped + * queue if we freed enough descriptors. + * + * Return true if we exhausted the budget while there is more work to be done. + */ +static bool fun_txq_reclaim(struct funeth_txq *q, int budget) +{ + unsigned int npkts = 0, nbytes = 0, ndesc = 0; + unsigned int head, limit, reclaim_idx; + + /* budget may be 0, e.g., netpoll */ + limit = budget ? budget : UINT_MAX; + + for (head = txq_hw_head(q), reclaim_idx = q->cons_cnt & q->mask; + head != reclaim_idx && npkts < limit; head = txq_hw_head(q)) { + /* The HW head is continually updated, ensure we don't read + * descriptor state before the head tells us to reclaim it. + * On the enqueue side the doorbell is an implicit write + * barrier. + */ + rmb(); + + do { + unsigned int pkt_desc = fun_unmap_pkt(q, reclaim_idx); + struct sk_buff *skb = q->info[reclaim_idx].skb; + + trace_funeth_tx_free(q, reclaim_idx, pkt_desc, head); + + nbytes += skb->len; + napi_consume_skb(skb, budget); + ndesc += pkt_desc; + reclaim_idx = (reclaim_idx + pkt_desc) & q->mask; + npkts++; + } while (reclaim_idx != head && npkts < limit); + } + + q->cons_cnt += ndesc; + netdev_tx_completed_queue(q->ndq, npkts, nbytes); + smp_mb(); /* pairs with the one in fun_tx_check_stop() */ + + if (unlikely(netif_tx_queue_stopped(q->ndq) && + fun_txq_may_restart(q))) { + netif_tx_wake_queue(q->ndq); + FUN_QSTAT_INC(q, tx_nrestarts); + } + + return reclaim_idx != head; +} + +/* The NAPI handler for Tx queues. */ +int fun_txq_napi_poll(struct napi_struct *napi, int budget) +{ + struct fun_irq *irq = container_of(napi, struct fun_irq, napi); + struct funeth_txq *q = irq->txq; + unsigned int db_val; + + if (fun_txq_reclaim(q, budget)) + return budget; /* exhausted budget */ + + napi_complete(napi); /* exhausted pending work */ + db_val = READ_ONCE(q->irq_db_val) | (q->cons_cnt & q->mask); + writel(db_val, q->db); + return 0; +} + +/* Reclaim up to @budget completed Tx packets from a TX XDP queue. */ +static unsigned int fun_xdpq_clean(struct funeth_txq *q, unsigned int budget) +{ + unsigned int npkts = 0, ndesc = 0, head, reclaim_idx; + + for (head = txq_hw_head(q), reclaim_idx = q->cons_cnt & q->mask; + head != reclaim_idx && npkts < budget; head = txq_hw_head(q)) { + /* The HW head is continually updated, ensure we don't read + * descriptor state before the head tells us to reclaim it. + * On the enqueue side the doorbell is an implicit write + * barrier. + */ + rmb(); + + do { + unsigned int pkt_desc = fun_unmap_pkt(q, reclaim_idx); + + xdp_return_frame(q->info[reclaim_idx].xdpf); + + trace_funeth_tx_free(q, reclaim_idx, pkt_desc, head); + + reclaim_idx = (reclaim_idx + pkt_desc) & q->mask; + ndesc += pkt_desc; + npkts++; + } while (reclaim_idx != head && npkts < budget); + } + + q->cons_cnt += ndesc; + return npkts; +} + +bool fun_xdp_tx(struct funeth_txq *q, struct xdp_frame *xdpf) +{ + unsigned int idx, nfrags = 1, ndesc = 1, tot_len = xdpf->len; + const struct skb_shared_info *si = NULL; + unsigned int lens[MAX_SKB_FRAGS + 1]; + dma_addr_t dma[MAX_SKB_FRAGS + 1]; + struct fun_eth_tx_req *req; + + if (fun_txq_avail(q) < FUN_XDP_CLEAN_THRES) + fun_xdpq_clean(q, FUN_XDP_CLEAN_BATCH); + + if (unlikely(xdp_frame_has_frags(xdpf))) { + si = xdp_get_shared_info_from_frame(xdpf); + tot_len = xdp_get_frame_len(xdpf); + nfrags += si->nr_frags; + ndesc = DIV_ROUND_UP((sizeof(*req) + nfrags * + sizeof(struct fun_dataop_gl)), + FUNETH_SQE_SIZE); + } + + if (unlikely(fun_txq_avail(q) < ndesc)) { + FUN_QSTAT_INC(q, tx_xdp_full); + return false; + } + + if (unlikely(fun_map_pkt(q->dma_dev, si, xdpf->data, xdpf->len, dma, + lens))) { + FUN_QSTAT_INC(q, tx_map_err); + return false; + } + + idx = q->prod_cnt & q->mask; + req = fun_tx_desc_addr(q, idx); + req->op = FUN_ETH_OP_TX; + req->len8 = 0; + req->flags = 0; + req->suboff8 = offsetof(struct fun_eth_tx_req, dataop); + req->repr_idn = 0; + req->encap_proto = 0; + fun_eth_offload_init(&req->offload, 0, 0, 0, 0, 0, 0, 0, 0); + req->dataop = FUN_DATAOP_HDR_INIT(nfrags, 0, nfrags, 0, tot_len); + + fun_write_gl(q, req, dma, lens, nfrags); + + q->info[idx].xdpf = xdpf; + + u64_stats_update_begin(&q->syncp); + q->stats.tx_bytes += tot_len; + q->stats.tx_pkts++; + u64_stats_update_end(&q->syncp); + + trace_funeth_tx(q, tot_len, idx, nfrags); + q->prod_cnt += ndesc; + + return true; +} + +int fun_xdp_xmit_frames(struct net_device *dev, int n, + struct xdp_frame **frames, u32 flags) +{ + struct funeth_priv *fp = netdev_priv(dev); + struct funeth_txq *q, **xdpqs; + int i, q_idx; + + if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) + return -EINVAL; + + xdpqs = rcu_dereference_bh(fp->xdpqs); + if (unlikely(!xdpqs)) + return -ENETDOWN; + + q_idx = smp_processor_id(); + if (unlikely(q_idx >= fp->num_xdpqs)) + return -ENXIO; + + for (q = xdpqs[q_idx], i = 0; i < n; i++) + if (!fun_xdp_tx(q, frames[i])) + break; + + if (unlikely(flags & XDP_XMIT_FLUSH)) + fun_txq_wr_db(q); + return i; +} + +/* Purge a Tx queue of any queued packets. Should be called once HW access + * to the packets has been revoked, e.g., after the queue has been disabled. + */ +static void fun_txq_purge(struct funeth_txq *q) +{ + while (q->cons_cnt != q->prod_cnt) { + unsigned int idx = q->cons_cnt & q->mask; + + q->cons_cnt += fun_unmap_pkt(q, idx); + dev_kfree_skb_any(q->info[idx].skb); + } + netdev_tx_reset_queue(q->ndq); +} + +static void fun_xdpq_purge(struct funeth_txq *q) +{ + while (q->cons_cnt != q->prod_cnt) { + unsigned int idx = q->cons_cnt & q->mask; + + q->cons_cnt += fun_unmap_pkt(q, idx); + xdp_return_frame(q->info[idx].xdpf); + } +} + +/* Create a Tx queue, allocating all the host resources needed. */ +static struct funeth_txq *fun_txq_create_sw(struct net_device *dev, + unsigned int qidx, + unsigned int ndesc, + struct fun_irq *irq) +{ + struct funeth_priv *fp = netdev_priv(dev); + struct funeth_txq *q; + int numa_node; + + if (irq) + numa_node = fun_irq_node(irq); /* skb Tx queue */ + else + numa_node = cpu_to_node(qidx); /* XDP Tx queue */ + + q = kzalloc_node(sizeof(*q), GFP_KERNEL, numa_node); + if (!q) + goto err; + + q->dma_dev = &fp->pdev->dev; + q->desc = fun_alloc_ring_mem(q->dma_dev, ndesc, FUNETH_SQE_SIZE, + sizeof(*q->info), true, numa_node, + &q->dma_addr, (void **)&q->info, + &q->hw_wb); + if (!q->desc) + goto free_q; + + q->netdev = dev; + q->mask = ndesc - 1; + q->qidx = qidx; + q->numa_node = numa_node; + u64_stats_init(&q->syncp); + q->init_state = FUN_QSTATE_INIT_SW; + return q; + +free_q: + kfree(q); +err: + netdev_err(dev, "Can't allocate memory for %s queue %u\n", + irq ? "Tx" : "XDP", qidx); + return NULL; +} + +static void fun_txq_free_sw(struct funeth_txq *q) +{ + struct funeth_priv *fp = netdev_priv(q->netdev); + + fun_free_ring_mem(q->dma_dev, q->mask + 1, FUNETH_SQE_SIZE, true, + q->desc, q->dma_addr, q->info); + + fp->tx_packets += q->stats.tx_pkts; + fp->tx_bytes += q->stats.tx_bytes; + fp->tx_dropped += q->stats.tx_map_err; + + kfree(q); +} + +/* Allocate the device portion of a Tx queue. */ +int fun_txq_create_dev(struct funeth_txq *q, struct fun_irq *irq) +{ + struct funeth_priv *fp = netdev_priv(q->netdev); + unsigned int irq_idx, ndesc = q->mask + 1; + int err; + + q->irq = irq; + *q->hw_wb = 0; + q->prod_cnt = 0; + q->cons_cnt = 0; + irq_idx = irq ? irq->irq_idx : 0; + + err = fun_sq_create(fp->fdev, + FUN_ADMIN_EPSQ_CREATE_FLAG_HEAD_WB_ADDRESS | + FUN_ADMIN_RES_CREATE_FLAG_ALLOCATOR, 0, + FUN_HCI_ID_INVALID, ilog2(FUNETH_SQE_SIZE), ndesc, + q->dma_addr, fp->tx_coal_count, fp->tx_coal_usec, + irq_idx, 0, fp->fdev->kern_end_qid, 0, + &q->hw_qid, &q->db); + if (err) + goto out; + + err = fun_create_and_bind_tx(fp, q->hw_qid); + if (err < 0) + goto free_devq; + q->ethid = err; + + if (irq) { + irq->txq = q; + q->ndq = netdev_get_tx_queue(q->netdev, q->qidx); + q->irq_db_val = FUN_IRQ_SQ_DB(fp->tx_coal_usec, + fp->tx_coal_count); + writel(q->irq_db_val, q->db); + } + + q->init_state = FUN_QSTATE_INIT_FULL; + netif_info(fp, ifup, q->netdev, + "%s queue %u, depth %u, HW qid %u, IRQ idx %u, eth id %u, node %d\n", + irq ? "Tx" : "XDP", q->qidx, ndesc, q->hw_qid, irq_idx, + q->ethid, q->numa_node); + return 0; + +free_devq: + fun_destroy_sq(fp->fdev, q->hw_qid); +out: + netdev_err(q->netdev, + "Failed to create %s queue %u on device, error %d\n", + irq ? "Tx" : "XDP", q->qidx, err); + return err; +} + +static void fun_txq_free_dev(struct funeth_txq *q) +{ + struct funeth_priv *fp = netdev_priv(q->netdev); + + if (q->init_state < FUN_QSTATE_INIT_FULL) + return; + + netif_info(fp, ifdown, q->netdev, + "Freeing %s queue %u (id %u), IRQ %u, ethid %u\n", + q->irq ? "Tx" : "XDP", q->qidx, q->hw_qid, + q->irq ? q->irq->irq_idx : 0, q->ethid); + + fun_destroy_sq(fp->fdev, q->hw_qid); + fun_res_destroy(fp->fdev, FUN_ADMIN_OP_ETH, 0, q->ethid); + + if (q->irq) { + q->irq->txq = NULL; + fun_txq_purge(q); + } else { + fun_xdpq_purge(q); + } + + q->init_state = FUN_QSTATE_INIT_SW; +} + +/* Create or advance a Tx queue, allocating all the host and device resources + * needed to reach the target state. + */ +int funeth_txq_create(struct net_device *dev, unsigned int qidx, + unsigned int ndesc, struct fun_irq *irq, int state, + struct funeth_txq **qp) +{ + struct funeth_txq *q = *qp; + int err; + + if (!q) + q = fun_txq_create_sw(dev, qidx, ndesc, irq); + if (!q) + return -ENOMEM; + + if (q->init_state >= state) + goto out; + + err = fun_txq_create_dev(q, irq); + if (err) { + if (!*qp) + fun_txq_free_sw(q); + return err; + } + +out: + *qp = q; + return 0; +} + +/* Free Tx queue resources until it reaches the target state. + * The queue must be already disconnected from the stack. + */ +struct funeth_txq *funeth_txq_free(struct funeth_txq *q, int state) +{ + if (state < FUN_QSTATE_INIT_FULL) + fun_txq_free_dev(q); + + if (state == FUN_QSTATE_DESTROYED) { + fun_txq_free_sw(q); + q = NULL; + } + + return q; +} |