From: Stephen Hemminger Date: Tue, 31 Mar 2020 17:13:59 +0000 (-0700) Subject: net/netvsc: split send buffers from Tx descriptors X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=cc02518132;p=dpdk.git net/netvsc: split send buffers from Tx descriptors The VMBus has reserved transmit area (per device) and transmit descriptors (per queue). The previous code was always having a 1:1 mapping between send buffers and descriptors. This can lead to one queue starving another and also buffer bloat. Change to working more like FreeBSD where there is a pool of transmit descriptors per queue. If send buffer is not available then no aggregation happens but the queue can still drain. Fixes: 4e9c73e96e83 ("net/netvsc: add Hyper-V network device") Cc: stable@dpdk.org Signed-off-by: Stephen Hemminger --- diff --git a/drivers/net/netvsc/hn_ethdev.c b/drivers/net/netvsc/hn_ethdev.c index 564620748d..ac66108380 100644 --- a/drivers/net/netvsc/hn_ethdev.c +++ b/drivers/net/netvsc/hn_ethdev.c @@ -257,6 +257,9 @@ static int hn_dev_info_get(struct rte_eth_dev *dev, dev_info->max_rx_queues = hv->max_queues; dev_info->max_tx_queues = hv->max_queues; + dev_info->tx_desc_lim.nb_min = 1; + dev_info->tx_desc_lim.nb_max = 4096; + if (rte_eal_process_type() != RTE_PROC_PRIMARY) return 0; @@ -982,7 +985,7 @@ eth_hn_dev_init(struct rte_eth_dev *eth_dev) if (err) goto failed; - err = hn_tx_pool_init(eth_dev); + err = hn_chim_init(eth_dev); if (err) goto failed; @@ -1018,7 +1021,7 @@ eth_hn_dev_init(struct rte_eth_dev *eth_dev) failed: PMD_INIT_LOG(NOTICE, "device init failed"); - hn_tx_pool_uninit(eth_dev); + hn_chim_uninit(eth_dev); hn_detach(hv); return err; } @@ -1042,7 +1045,7 @@ eth_hn_dev_uninit(struct rte_eth_dev *eth_dev) eth_dev->rx_pkt_burst = NULL; hn_detach(hv); - hn_tx_pool_uninit(eth_dev); + hn_chim_uninit(eth_dev); rte_vmbus_chan_close(hv->primary->chan); rte_free(hv->primary); ret = rte_eth_dev_owner_delete(hv->owner.id); diff --git a/drivers/net/netvsc/hn_rxtx.c b/drivers/net/netvsc/hn_rxtx.c index 7212780c15..32c03e3da0 100644 --- a/drivers/net/netvsc/hn_rxtx.c +++ b/drivers/net/netvsc/hn_rxtx.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include #include @@ -83,7 +84,7 @@ struct hn_txdesc { struct rte_mbuf *m; uint16_t queue_id; - uint16_t chim_index; + uint32_t chim_index; uint32_t chim_size; uint32_t data_size; uint32_t packets; @@ -98,11 +99,13 @@ struct hn_txdesc { RNDIS_PKTINFO_SIZE(NDIS_LSO2_INFO_SIZE) + \ RNDIS_PKTINFO_SIZE(NDIS_TXCSUM_INFO_SIZE)) +#define HN_RNDIS_PKT_ALIGNED RTE_ALIGN(HN_RNDIS_PKT_LEN, RTE_CACHE_LINE_SIZE) + /* Minimum space required for a packet */ #define HN_PKTSIZE_MIN(align) \ RTE_ALIGN(RTE_ETHER_MIN_LEN + HN_RNDIS_PKT_LEN, align) -#define DEFAULT_TX_FREE_THRESH 32U +#define DEFAULT_TX_FREE_THRESH 32 static void hn_update_packet_stats(struct hn_stats *stats, const struct rte_mbuf *m) @@ -150,63 +153,77 @@ hn_rndis_pktmsg_offset(uint32_t ofs) static void hn_txd_init(struct rte_mempool *mp __rte_unused, void *opaque, void *obj, unsigned int idx) { + struct hn_tx_queue *txq = opaque; struct hn_txdesc *txd = obj; - struct rte_eth_dev *dev = opaque; - struct rndis_packet_msg *pkt; memset(txd, 0, sizeof(*txd)); - txd->chim_index = idx; - - pkt = rte_malloc_socket("RNDIS_TX", HN_RNDIS_PKT_LEN, - rte_align32pow2(HN_RNDIS_PKT_LEN), - dev->device->numa_node); - if (!pkt) - rte_exit(EXIT_FAILURE, "can not allocate RNDIS header"); - txd->rndis_pkt = pkt; + txd->queue_id = txq->queue_id; + txd->chim_index = NVS_CHIM_IDX_INVALID; + txd->rndis_pkt = (struct rndis_packet_msg *)(char *)txq->tx_rndis + + idx * HN_RNDIS_PKT_ALIGNED; } -/* - * Unlike Linux and FreeBSD, this driver uses a mempool - * to limit outstanding transmits and reserve buffers - */ int -hn_tx_pool_init(struct rte_eth_dev *dev) +hn_chim_init(struct rte_eth_dev *dev) { struct hn_data *hv = dev->data->dev_private; - char name[RTE_MEMPOOL_NAMESIZE]; - struct rte_mempool *mp; + uint32_t i, chim_bmp_size; + + rte_spinlock_init(&hv->chim_lock); + chim_bmp_size = rte_bitmap_get_memory_footprint(hv->chim_cnt); + hv->chim_bmem = rte_zmalloc("hn_chim_bitmap", chim_bmp_size, + RTE_CACHE_LINE_SIZE); + if (hv->chim_bmem == NULL) { + PMD_INIT_LOG(ERR, "failed to allocate bitmap size %u", + chim_bmp_size); + return -1; + } - snprintf(name, sizeof(name), - "hn_txd_%u", dev->data->port_id); - - PMD_INIT_LOG(DEBUG, "create a TX send pool %s n=%u size=%zu socket=%d", - name, hv->chim_cnt, sizeof(struct hn_txdesc), - dev->device->numa_node); - - mp = rte_mempool_create(name, hv->chim_cnt, sizeof(struct hn_txdesc), - HN_TXD_CACHE_SIZE, 0, - NULL, NULL, - hn_txd_init, dev, - dev->device->numa_node, 0); - if (!mp) { - PMD_DRV_LOG(ERR, - "mempool %s create failed: %d", name, rte_errno); - return -rte_errno; + hv->chim_bmap = rte_bitmap_init(hv->chim_cnt, + hv->chim_bmem, chim_bmp_size); + if (hv->chim_bmap == NULL) { + PMD_INIT_LOG(ERR, "failed to init chim bitmap"); + return -1; } - hv->tx_pool = mp; + for (i = 0; i < hv->chim_cnt; i++) + rte_bitmap_set(hv->chim_bmap, i); + return 0; } void -hn_tx_pool_uninit(struct rte_eth_dev *dev) +hn_chim_uninit(struct rte_eth_dev *dev) { struct hn_data *hv = dev->data->dev_private; - if (hv->tx_pool) { - rte_mempool_free(hv->tx_pool); - hv->tx_pool = NULL; + rte_bitmap_free(hv->chim_bmap); + rte_free(hv->chim_bmem); + hv->chim_bmem = NULL; +} + +static uint32_t hn_chim_alloc(struct hn_data *hv) +{ + uint32_t index = NVS_CHIM_IDX_INVALID; + uint64_t slab; + + rte_spinlock_lock(&hv->chim_lock); + if (rte_bitmap_scan(hv->chim_bmap, &index, &slab)) + rte_bitmap_clear(hv->chim_bmap, index); + rte_spinlock_unlock(&hv->chim_lock); + + return index; +} + +static void hn_chim_free(struct hn_data *hv, uint32_t chim_idx) +{ + if (chim_idx >= hv->chim_cnt) { + PMD_DRV_LOG(ERR, "Invalid chimney index %u", chim_idx); + } else { + rte_spinlock_lock(&hv->chim_lock); + rte_bitmap_set(hv->chim_bmap, chim_idx); + rte_spinlock_unlock(&hv->chim_lock); } } @@ -220,15 +237,16 @@ static void hn_reset_txagg(struct hn_tx_queue *txq) int hn_dev_tx_queue_setup(struct rte_eth_dev *dev, - uint16_t queue_idx, uint16_t nb_desc __rte_unused, + uint16_t queue_idx, uint16_t nb_desc, unsigned int socket_id, const struct rte_eth_txconf *tx_conf) { struct hn_data *hv = dev->data->dev_private; struct hn_tx_queue *txq; + char name[RTE_MEMPOOL_NAMESIZE]; uint32_t tx_free_thresh; - int err; + int err = -ENOMEM; PMD_INIT_FUNC_TRACE(); @@ -244,14 +262,42 @@ hn_dev_tx_queue_setup(struct rte_eth_dev *dev, tx_free_thresh = tx_conf->tx_free_thresh; if (tx_free_thresh == 0) - tx_free_thresh = RTE_MIN(hv->chim_cnt / 4, + tx_free_thresh = RTE_MIN(nb_desc / 4, DEFAULT_TX_FREE_THRESH); - if (tx_free_thresh >= hv->chim_cnt - 3) - tx_free_thresh = hv->chim_cnt - 3; + if (tx_free_thresh + 3 >= nb_desc) { + PMD_INIT_LOG(ERR, + "tx_free_thresh must be less than the number of TX entries minus 3(%u)." + " (tx_free_thresh=%u port=%u queue=%u)\n", + nb_desc - 3, + tx_free_thresh, dev->data->port_id, queue_idx); + return -EINVAL; + } txq->free_thresh = tx_free_thresh; + snprintf(name, sizeof(name), + "hn_txd_%u_%u", dev->data->port_id, queue_idx); + + PMD_INIT_LOG(DEBUG, "TX descriptor pool %s n=%u size=%zu", + name, nb_desc, sizeof(struct hn_txdesc)); + + txq->tx_rndis = rte_calloc("hn_txq_rndis", nb_desc, + HN_RNDIS_PKT_ALIGNED, RTE_CACHE_LINE_SIZE); + if (txq->tx_rndis == NULL) + goto error; + + txq->txdesc_pool = rte_mempool_create(name, nb_desc, + sizeof(struct hn_txdesc), + 0, 0, NULL, NULL, + hn_txd_init, txq, + dev->device->numa_node, 0); + if (txq->txdesc_pool == NULL) { + PMD_DRV_LOG(ERR, + "mempool %s create failed: %d", name, rte_errno); + goto error; + } + txq->agg_szmax = RTE_MIN(hv->chim_szmax, hv->rndis_agg_size); txq->agg_pktmax = hv->rndis_agg_pkts; txq->agg_align = hv->rndis_agg_align; @@ -260,31 +306,57 @@ hn_dev_tx_queue_setup(struct rte_eth_dev *dev, err = hn_vf_tx_queue_setup(dev, queue_idx, nb_desc, socket_id, tx_conf); - if (err) { - rte_free(txq); - return err; + if (err == 0) { + dev->data->tx_queues[queue_idx] = txq; + return 0; } - dev->data->tx_queues[queue_idx] = txq; - return 0; +error: + if (txq->txdesc_pool) + rte_mempool_free(txq->txdesc_pool); + rte_free(txq->tx_rndis); + rte_free(txq); + return err; +} + + +static struct hn_txdesc *hn_txd_get(struct hn_tx_queue *txq) +{ + struct hn_txdesc *txd; + + if (rte_mempool_get(txq->txdesc_pool, (void **)&txd)) { + ++txq->stats.ring_full; + PMD_TX_LOG(DEBUG, "tx pool exhausted!"); + return NULL; + } + + txd->m = NULL; + txd->packets = 0; + txd->data_size = 0; + txd->chim_size = 0; + + return txd; +} + +static void hn_txd_put(struct hn_tx_queue *txq, struct hn_txdesc *txd) +{ + rte_mempool_put(txq->txdesc_pool, txd); } void hn_dev_tx_queue_release(void *arg) { struct hn_tx_queue *txq = arg; - struct hn_txdesc *txd; PMD_INIT_FUNC_TRACE(); if (!txq) return; - /* If any pending data is still present just drop it */ - txd = txq->agg_txd; - if (txd) - rte_mempool_put(txq->hv->tx_pool, txd); + if (txq->txdesc_pool) + rte_mempool_free(txq->txdesc_pool); + rte_free(txq->tx_rndis); rte_free(txq); } @@ -292,6 +364,7 @@ static void hn_nvs_send_completed(struct rte_eth_dev *dev, uint16_t queue_id, unsigned long xactid, const struct hn_nvs_rndis_ack *ack) { + struct hn_data *hv = dev->data->dev_private; struct hn_txdesc *txd = (struct hn_txdesc *)xactid; struct hn_tx_queue *txq; @@ -312,9 +385,11 @@ hn_nvs_send_completed(struct rte_eth_dev *dev, uint16_t queue_id, ++txq->stats.errors; } - rte_pktmbuf_free(txd->m); + if (txd->chim_index != NVS_CHIM_IDX_INVALID) + hn_chim_free(hv, txd->chim_index); - rte_mempool_put(txq->hv->tx_pool, txd); + rte_pktmbuf_free(txd->m); + hn_txd_put(txq, txd); } /* Handle transmit completion events */ @@ -1036,28 +1111,15 @@ static int hn_flush_txagg(struct hn_tx_queue *txq, bool *need_sig) return ret; } -static struct hn_txdesc *hn_new_txd(struct hn_data *hv, - struct hn_tx_queue *txq) -{ - struct hn_txdesc *txd; - - if (rte_mempool_get(hv->tx_pool, (void **)&txd)) { - ++txq->stats.ring_full; - PMD_TX_LOG(DEBUG, "tx pool exhausted!"); - return NULL; - } - - txd->m = NULL; - txd->queue_id = txq->queue_id; - txd->packets = 0; - txd->data_size = 0; - txd->chim_size = 0; - - return txd; -} - +/* + * Try and find a place in a send chimney buffer to put + * the small packet. If space is available, this routine + * returns a pointer of where to place the data. + * If no space, caller should try direct transmit. + */ static void * -hn_try_txagg(struct hn_data *hv, struct hn_tx_queue *txq, uint32_t pktsize) +hn_try_txagg(struct hn_data *hv, struct hn_tx_queue *txq, + struct hn_txdesc *txd, uint32_t pktsize) { struct hn_txdesc *agg_txd = txq->agg_txd; struct rndis_packet_msg *pkt; @@ -1085,7 +1147,7 @@ hn_try_txagg(struct hn_data *hv, struct hn_tx_queue *txq, uint32_t pktsize) } chim = (uint8_t *)pkt + pkt->len; - + txq->agg_prevpkt = chim; txq->agg_pktleft--; txq->agg_szleft -= pktsize; if (txq->agg_szleft < HN_PKTSIZE_MIN(txq->agg_align)) { @@ -1095,18 +1157,21 @@ hn_try_txagg(struct hn_data *hv, struct hn_tx_queue *txq, uint32_t pktsize) */ txq->agg_pktleft = 0; } - } else { - agg_txd = hn_new_txd(hv, txq); - if (!agg_txd) - return NULL; - - chim = (uint8_t *)hv->chim_res->addr - + agg_txd->chim_index * hv->chim_szmax; - txq->agg_txd = agg_txd; - txq->agg_pktleft = txq->agg_pktmax - 1; - txq->agg_szleft = txq->agg_szmax - pktsize; + hn_txd_put(txq, txd); + return chim; } + + txd->chim_index = hn_chim_alloc(hv); + if (txd->chim_index == NVS_CHIM_IDX_INVALID) + return NULL; + + chim = (uint8_t *)hv->chim_res->addr + + txd->chim_index * hv->chim_szmax; + + txq->agg_txd = txd; + txq->agg_pktleft = txq->agg_pktmax - 1; + txq->agg_szleft = txq->agg_szmax - pktsize; txq->agg_prevpkt = chim; return chim; @@ -1329,13 +1394,18 @@ hn_xmit_pkts(void *ptxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) return (*vf_dev->tx_pkt_burst)(sub_q, tx_pkts, nb_pkts); } - if (rte_mempool_avail_count(hv->tx_pool) <= txq->free_thresh) + if (rte_mempool_avail_count(txq->txdesc_pool) <= txq->free_thresh) hn_process_events(hv, txq->queue_id, 0); for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) { struct rte_mbuf *m = tx_pkts[nb_tx]; uint32_t pkt_size = m->pkt_len + HN_RNDIS_PKT_LEN; struct rndis_packet_msg *pkt; + struct hn_txdesc *txd; + + txd = hn_txd_get(txq); + if (txd == NULL) + break; /* For small packets aggregate them in chimney buffer */ if (m->pkt_len < HN_TXCOPY_THRESHOLD && pkt_size <= txq->agg_szmax) { @@ -1346,7 +1416,8 @@ hn_xmit_pkts(void *ptxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) goto fail; } - pkt = hn_try_txagg(hv, txq, pkt_size); + + pkt = hn_try_txagg(hv, txq, txd, pkt_size); if (unlikely(!pkt)) break; @@ -1360,21 +1431,13 @@ hn_xmit_pkts(void *ptxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) hn_flush_txagg(txq, &need_sig)) goto fail; } else { - struct hn_txdesc *txd; - - /* can send chimney data and large packet at once */ - txd = txq->agg_txd; - if (txd) { - hn_reset_txagg(txq); - } else { - txd = hn_new_txd(hv, txq); - if (unlikely(!txd)) - break; - } + /* Send any outstanding packets in buffer */ + if (txq->agg_txd && hn_flush_txagg(txq, &need_sig)) + goto fail; pkt = txd->rndis_pkt; txd->m = m; - txd->data_size += m->pkt_len; + txd->data_size = m->pkt_len; ++txd->packets; hn_encap(pkt, queue_id, m); @@ -1383,7 +1446,7 @@ hn_xmit_pkts(void *ptxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) if (unlikely(ret != 0)) { PMD_TX_LOG(NOTICE, "sg send failed: %d", ret); ++txq->stats.errors; - rte_mempool_put(hv->tx_pool, txd); + hn_txd_put(txq, txd); goto fail; } } diff --git a/drivers/net/netvsc/hn_var.h b/drivers/net/netvsc/hn_var.h index 05bc492511..822d737bd3 100644 --- a/drivers/net/netvsc/hn_var.h +++ b/drivers/net/netvsc/hn_var.h @@ -52,6 +52,8 @@ struct hn_tx_queue { uint16_t port_id; uint16_t queue_id; uint32_t free_thresh; + struct rte_mempool *txdesc_pool; + void *tx_rndis; /* Applied packet transmission aggregation limits. */ uint32_t agg_szmax; @@ -115,8 +117,10 @@ struct hn_data { uint16_t num_queues; uint64_t rss_offloads; + rte_spinlock_t chim_lock; struct rte_mem_resource *chim_res; /* UIO resource for Tx */ - struct rte_mempool *tx_pool; /* Tx descriptors */ + struct rte_bitmap *chim_bmap; /* Send buffer map */ + void *chim_bmem; uint32_t chim_szmax; /* Max size per buffer */ uint32_t chim_cnt; /* Max packets per buffer */ @@ -157,8 +161,8 @@ uint16_t hn_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t hn_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts); -int hn_tx_pool_init(struct rte_eth_dev *dev); -void hn_tx_pool_uninit(struct rte_eth_dev *dev); +int hn_chim_init(struct rte_eth_dev *dev); +void hn_chim_uninit(struct rte_eth_dev *dev); int hn_dev_link_update(struct rte_eth_dev *dev, int wait); int hn_dev_tx_queue_setup(struct rte_eth_dev *dev, uint16_t queue_idx, uint16_t nb_desc, unsigned int socket_id,