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([212.143.139.214]) by mx.google.com with ESMTPSA id e2sm10069621wjy.46.2015.03.05.03.28.15 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 05 Mar 2015 03:28:16 -0800 (PST) From: Vlad Zolotarov To: dev@dpdk.org Date: Thu, 5 Mar 2015 13:28:05 +0200 Message-Id: <1425554885-16901-7-git-send-email-vladz@cloudius-systems.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1425554885-16901-1-git-send-email-vladz@cloudius-systems.com> References: <1425554885-16901-1-git-send-email-vladz@cloudius-systems.com> Subject: [dpdk-dev] [PATCH v2 6/6] ixgbe: Add LRO support X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Mar 2015 11:28:17 -0000 - Only x540 and 82599 devices support LRO. - Add the appropriate HW configuration. - Add RSC aware rx_pkt_burst() handlers: - Implemented bulk allocation and non-bulk allocation versions. - Add LRO-specific fields to rte_eth_rxmode, to rte_eth_dev_data and to igb_rx_queue. - Use the appropriate handler when LRO is requested. Signed-off-by: Vlad Zolotarov --- New in v2: - Removed rte_eth_dev_data.lro_bulk_alloc. - Fixed a few styling and spelling issues. --- lib/librte_ether/rte_ethdev.h | 6 +- lib/librte_pmd_ixgbe/ixgbe_ethdev.c | 8 + lib/librte_pmd_ixgbe/ixgbe_ethdev.h | 5 + lib/librte_pmd_ixgbe/ixgbe_rxtx.c | 562 +++++++++++++++++++++++++++++++++++- lib/librte_pmd_ixgbe/ixgbe_rxtx.h | 6 + 5 files changed, 580 insertions(+), 7 deletions(-) diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h index 8db3127..9e7160a 100644 --- a/lib/librte_ether/rte_ethdev.h +++ b/lib/librte_ether/rte_ethdev.h @@ -320,14 +320,15 @@ struct rte_eth_rxmode { enum rte_eth_rx_mq_mode mq_mode; uint32_t max_rx_pkt_len; /**< Only used if jumbo_frame enabled. */ uint16_t split_hdr_size; /**< hdr buf size (header_split enabled).*/ - uint8_t header_split : 1, /**< Header Split enable. */ + uint16_t header_split : 1, /**< Header Split enable. */ hw_ip_checksum : 1, /**< IP/UDP/TCP checksum offload enable. */ hw_vlan_filter : 1, /**< VLAN filter enable. */ hw_vlan_strip : 1, /**< VLAN strip enable. */ hw_vlan_extend : 1, /**< Extended VLAN enable. */ jumbo_frame : 1, /**< Jumbo Frame Receipt enable. */ hw_strip_crc : 1, /**< Enable CRC stripping by hardware. */ - enable_scatter : 1; /**< Enable scatter packets rx handler */ + enable_scatter : 1, /**< Enable scatter packets rx handler */ + enable_lro : 1; /**< Enable LRO */ }; /** @@ -1515,6 +1516,7 @@ struct rte_eth_dev_data { uint8_t port_id; /**< Device [external] port identifier. */ uint8_t promiscuous : 1, /**< RX promiscuous mode ON(1) / OFF(0). */ scattered_rx : 1, /**< RX of scattered packets is ON(1) / OFF(0) */ + lro : 1, /**< RX LRO is ON(1) / OFF(0) */ all_multicast : 1, /**< RX all multicast mode ON(1) / OFF(0). */ dev_started : 1; /**< Device state: STARTED(1) / STOPPED(0). */ }; diff --git a/lib/librte_pmd_ixgbe/ixgbe_ethdev.c b/lib/librte_pmd_ixgbe/ixgbe_ethdev.c index f93dcfc..a943e0b 100644 --- a/lib/librte_pmd_ixgbe/ixgbe_ethdev.c +++ b/lib/librte_pmd_ixgbe/ixgbe_ethdev.c @@ -1650,6 +1650,7 @@ ixgbe_dev_stop(struct rte_eth_dev *dev) /* Clear stored conf */ dev->data->scattered_rx = 0; + dev->data->lro = 0; hw->rx_bulk_alloc_allowed = false; /* Clear recorded link status */ @@ -2019,6 +2020,13 @@ ixgbe_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info) DEV_RX_OFFLOAD_IPV4_CKSUM | DEV_RX_OFFLOAD_UDP_CKSUM | DEV_RX_OFFLOAD_TCP_CKSUM; + +#ifdef RTE_ETHDEV_LRO_SUPPORT + if (hw->mac.type == ixgbe_mac_82599EB || + hw->mac.type == ixgbe_mac_X540) + dev_info->rx_offload_capa |= DEV_RX_OFFLOAD_TCP_LRO; +#endif + dev_info->tx_offload_capa = DEV_TX_OFFLOAD_VLAN_INSERT | DEV_TX_OFFLOAD_IPV4_CKSUM | diff --git a/lib/librte_pmd_ixgbe/ixgbe_ethdev.h b/lib/librte_pmd_ixgbe/ixgbe_ethdev.h index a549f5c..e206584 100644 --- a/lib/librte_pmd_ixgbe/ixgbe_ethdev.h +++ b/lib/librte_pmd_ixgbe/ixgbe_ethdev.h @@ -349,6 +349,11 @@ uint16_t ixgbe_recv_pkts_bulk_alloc(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t ixgbe_recv_scattered_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts); +uint16_t ixgbe_recv_pkts_lro(void *rx_queue, + struct rte_mbuf **rx_pkts, uint16_t nb_pkts); +uint16_t ixgbe_recv_pkts_lro_bulk_alloc(void *rx_queue, + struct rte_mbuf **rx_pkts, uint16_t nb_pkts); + uint16_t ixgbe_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts); diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c index bdac885..f5525e5 100644 --- a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c +++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c @@ -1366,6 +1366,15 @@ ixgbe_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, } /** + * Detect an RSC descriptor. + */ +static inline uint32_t ixgbe_rsc_count(union ixgbe_adv_rx_desc *rx) +{ + return (rte_le_to_cpu_32(rx->wb.lower.lo_dword.data) & + IXGBE_RXDADV_RSCCNT_MASK) >> IXGBE_RXDADV_RSCCNT_SHIFT; +} + +/** * Initialize the first mbuf of the returned packet: * - RX port identifier, * - hardware offload data, if any: @@ -1410,6 +1419,291 @@ static inline void ixgbe_fill_cluster_head_buf( } } +/** + * Bulk receive handler for and LRO case. + * + * @rx_queue Rx queue handle + * @rx_pkts table of received packets + * @nb_pkts size of rx_pkts table + * @bulk_alloc if TRUE bulk allocation is used for a HW ring refilling + * + * Handles the Rx HW ring completions when RSC feature is configured. Uses an + * additional ring of igb_rsc_entry's that will hold the relevant RSC info. + * + * We use the same logic as in Lunux and in FreeBSD ixgbe drivers: + * 1) When non-EOP RSC completion arrives: + * a) Update the HEAD of the current RSC aggregation cluster with the new + * segment's data length. + * b) Set the "next" pointer of the current segment to point to the segment + * at the NEXTP index. + * c) Pass the HEAD of RSC aggregation cluster on to the next NEXTP entry + * in the sw_rsc_ring. + * 2) When EOP arrives we just update the cluster's total length and offload + * flags and deliver the cluster up to the upper layers. In our case - put it + * in the rx_pkts table. + * + * Returns the number of received packets/clusters (according to the "bulk + * receive" interface). + */ +static inline uint16_t +_recv_pkts_lro(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts, + bool bulk_alloc) +{ + struct igb_rx_queue *rxq = rx_queue; + volatile union ixgbe_adv_rx_desc *rx_ring = rxq->rx_ring; + struct igb_rx_entry *sw_ring = rxq->sw_ring; + struct igb_rsc_entry *sw_rsc_ring = rxq->sw_rsc_ring; + uint16_t rx_id = rxq->rx_tail; + uint16_t nb_rx = 0; + uint16_t nb_hold = rxq->nb_rx_hold; + uint16_t prev_id = rxq->rx_tail; + + while (nb_rx < nb_pkts) { + bool eop; + struct igb_rx_entry *rxe; + struct igb_rsc_entry *rsc_entry; + struct igb_rsc_entry *next_rsc_entry; + struct igb_rx_entry *next_rxe; + struct rte_mbuf *first_seg; + struct rte_mbuf *rxm; + struct rte_mbuf *nmb; + union ixgbe_adv_rx_desc rxd; + uint16_t data_len; + uint16_t next_id; + volatile union ixgbe_adv_rx_desc *rxdp; + uint32_t staterr; + +next_desc: + /* + * The code in this whole file uses the volatile pointer to + * ensure the read ordering of the status and the rest of the + * descriptor fields (on the compiler level only!!!). This is so + * UGLY - why not to just use the compiler barrier instead? DPDK + * even has the rte_compiler_barrier() for that. + * + * But most importantly this is just wrong because this doesn't + * ensure memory ordering in a general case at all. For + * instance, DPDK is supposed to work on Power CPUs where + * compiler barrier may just not be enough! + * + * I tried to write only this function properly to have a + * starting point (as a part of an LRO/RSC series) but the + * compiler cursed at me when I tried to cast away the + * "volatile" from rx_ring (yes, it's volatile too!!!). So, I'm + * keeping it the way it is for now. + * + * The code in this file is broken in so many other places and + * will just not work on a big endian CPU anyway therefore the + * lines below will have to be revisited together with the rest + * of the ixgbe PMD. + * + * TODO: + * - Get rid of "volatile" crap and let the compiler do its + * job. + * - Use the proper memory barrier (rte_rmb()) to ensure the + * memory ordering below. + */ + rxdp = &rx_ring[rx_id]; + staterr = rte_le_to_cpu_32(rxdp->wb.upper.status_error); + + if (!(staterr & IXGBE_RXDADV_STAT_DD)) + break; + + rxd = *rxdp; + + PMD_RX_LOG(DEBUG, "port_id=%u queue_id=%u rx_id=%u " + "staterr=0x%x data_len=%u", + rxq->port_id, rxq->queue_id, rx_id, staterr, + rte_le_to_cpu_16(rxd.wb.upper.length)); + + if (!bulk_alloc) { + nmb = rte_rxmbuf_alloc(rxq->mb_pool); + if (nmb == NULL) { + PMD_RX_LOG(DEBUG, "RX mbuf alloc failed " + "port_id=%u queue_id=%u", + rxq->port_id, rxq->queue_id); + + rte_eth_devices[rxq->port_id].data-> + rx_mbuf_alloc_failed++; + break; + } + } else if (nb_hold > rxq->rx_free_thresh) { + uint16_t next_rdt = rxq->rx_free_trigger; + + if (!ixgbe_rx_alloc_bufs(rxq, false)) { + rte_wmb(); + IXGBE_PCI_REG_WRITE(rxq->rdt_reg_addr, + next_rdt); + nb_hold -= rxq->rx_free_thresh; + } else { + PMD_RX_LOG(DEBUG, "RX bulk alloc failed " + "port_id=%u queue_id=%u", + rxq->port_id, rxq->queue_id); + + rte_eth_devices[rxq->port_id].data-> + rx_mbuf_alloc_failed++; + break; + } + } + + nb_hold++; + rxe = &sw_ring[rx_id]; + eop = staterr & IXGBE_RXDADV_STAT_EOP; + + next_id = rx_id + 1; + if (next_id == rxq->nb_rx_desc) + next_id = 0; + + /* Prefetch next mbuf while processing current one. */ + rte_ixgbe_prefetch(sw_ring[next_id].mbuf); + + /* + * When next RX descriptor is on a cache-line boundary, + * prefetch the next 4 RX descriptors and the next 4 pointers + * to mbufs. + */ + if ((next_id & 0x3) == 0) { + rte_ixgbe_prefetch(&rx_ring[next_id]); + rte_ixgbe_prefetch(&sw_ring[next_id]); + } + + rxm = rxe->mbuf; + + if (!bulk_alloc) { + __le64 dma = + rte_cpu_to_le_64(RTE_MBUF_DATA_DMA_ADDR_DEFAULT(nmb)); + /* + * Update RX descriptor with the physical address of the + * new data buffer of the new allocated mbuf. + */ + rxe->mbuf = nmb; + + rxm->data_off = RTE_PKTMBUF_HEADROOM; + rxdp->read.hdr_addr = dma; + rxdp->read.pkt_addr = dma; + } + /* + * Set data length & data buffer address of mbuf. + */ + data_len = rte_le_to_cpu_16(rxd.wb.upper.length); + rxm->data_len = data_len; + + if (!eop) { + uint16_t nextp_id; + /* + * Get next descriptor index: + * - For RSC it's in the NEXTP field. + * - For a scattered packet - it's just a following + * descriptor. + */ + if (ixgbe_rsc_count(&rxd)) + nextp_id = + (staterr & IXGBE_RXDADV_NEXTP_MASK) >> + IXGBE_RXDADV_NEXTP_SHIFT; + else + nextp_id = next_id; + + next_rsc_entry = &sw_rsc_ring[nextp_id]; + next_rxe = &sw_ring[nextp_id]; + rte_ixgbe_prefetch(next_rxe); + } + + rsc_entry = &sw_rsc_ring[rx_id]; + first_seg = rsc_entry->fbuf; + rsc_entry->fbuf = NULL; + + /* + * If this is the first buffer of the received packet, + * set the pointer to the first mbuf of the packet and + * initialize its context. + * Otherwise, update the total length and the number of segments + * of the current scattered packet, and update the pointer to + * the last mbuf of the current packet. + */ + if (first_seg == NULL) { + first_seg = rxm; + first_seg->pkt_len = data_len; + first_seg->nb_segs = 1; + } else { + first_seg->pkt_len += data_len; + first_seg->nb_segs++; + } + + prev_id = rx_id; + rx_id = next_id; + + /* + * If this is not the last buffer of the received packet, update + * the pointer to the first mbuf at the NEXTP entry in the + * sw_rsc_ring and continue to parse the RX ring. + */ + if (!eop) { + rxm->next = next_rxe->mbuf; + next_rsc_entry->fbuf = first_seg; + goto next_desc; + } + + /* + * This is the last buffer of the received packet - return + * the current cluster to the user. + */ + rxm->next = NULL; + + /* Initialize the first mbuf of the returned packet */ + ixgbe_fill_cluster_head_buf(first_seg, &rxd, rxq->port_id, + staterr); + + /* Prefetch data of first segment, if configured to do so. */ + rte_packet_prefetch((char *)first_seg->buf_addr + + first_seg->data_off); + + /* + * Store the mbuf address into the next entry of the array + * of returned packets. + */ + rx_pkts[nb_rx++] = first_seg; + } + + /* + * Record index of the next RX descriptor to probe. + */ + rxq->rx_tail = rx_id; + + /* + * If the number of free RX descriptors is greater than the RX free + * threshold of the queue, advance the Receive Descriptor Tail (RDT) + * register. + * Update the RDT with the value of the last processed RX descriptor + * minus 1, to guarantee that the RDT register is never equal to the + * RDH register, which creates a "full" ring situtation from the + * hardware point of view... + */ + if (!bulk_alloc && nb_hold > rxq->rx_free_thresh) { + PMD_RX_LOG(DEBUG, "port_id=%u queue_id=%u rx_tail=%u " + "nb_hold=%u nb_rx=%u", + rxq->port_id, rxq->queue_id, rx_id, nb_hold, nb_rx); + + IXGBE_PCI_REG_WRITE(rxq->rdt_reg_addr, prev_id); + nb_hold = 0; + } + + rxq->nb_rx_hold = nb_hold; + return nb_rx; +} + +uint16_t +ixgbe_recv_pkts_lro(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts) +{ + return _recv_pkts_lro(rx_queue, rx_pkts, nb_pkts, false); +} + +uint16_t +ixgbe_recv_pkts_lro_bulk_alloc(void *rx_queue, struct rte_mbuf **rx_pkts, + uint16_t nb_pkts) +{ + return _recv_pkts_lro(rx_queue, rx_pkts, nb_pkts, true); +} + uint16_t ixgbe_recv_scattered_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts) @@ -2022,6 +2316,7 @@ ixgbe_rx_queue_release(struct igb_rx_queue *rxq) if (rxq != NULL) { ixgbe_rx_queue_release_mbufs(rxq); rte_free(rxq->sw_ring); + rte_free(rxq->sw_rsc_ring); rte_free(rxq); } } @@ -2144,6 +2439,7 @@ ixgbe_reset_rx_queue(struct ixgbe_hw *hw, struct igb_rx_queue *rxq) rxq->nb_rx_hold = 0; rxq->pkt_first_seg = NULL; rxq->pkt_last_seg = NULL; + rxq->rsc_en = 0; } int @@ -2158,6 +2454,14 @@ ixgbe_dev_rx_queue_setup(struct rte_eth_dev *dev, struct igb_rx_queue *rxq; struct ixgbe_hw *hw; uint16_t len; + struct rte_eth_dev_info dev_info = { 0 }; + struct rte_eth_rxmode *dev_rx_mode = &dev->data->dev_conf.rxmode; + bool rsc_requested = false; + + dev->dev_ops->dev_infos_get(dev, &dev_info); + if ((dev_info.rx_offload_capa & DEV_RX_OFFLOAD_TCP_LRO) && + dev_rx_mode->enable_lro) + rsc_requested = true; PMD_INIT_FUNC_TRACE(); hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private); @@ -2248,12 +2552,28 @@ ixgbe_dev_rx_queue_setup(struct rte_eth_dev *dev, rxq->sw_ring = rte_zmalloc_socket("rxq->sw_ring", sizeof(struct igb_rx_entry) * len, RTE_CACHE_LINE_SIZE, socket_id); - if (rxq->sw_ring == NULL) { + if (!rxq->sw_ring) { ixgbe_rx_queue_release(rxq); return (-ENOMEM); } - PMD_INIT_LOG(DEBUG, "sw_ring=%p hw_ring=%p dma_addr=0x%"PRIx64, - rxq->sw_ring, rxq->rx_ring, rxq->rx_ring_phys_addr); + + if (rsc_requested) { + rxq->sw_rsc_ring = + rte_zmalloc_socket("rxq->sw_rsc_ring", + sizeof(struct igb_rsc_entry) * len, + RTE_CACHE_LINE_SIZE, socket_id); + if (!rxq->sw_rsc_ring) { + ixgbe_rx_queue_release(rxq); + return (-ENOMEM); + } + } else { + rxq->sw_rsc_ring = NULL; + } + + PMD_INIT_LOG(DEBUG, "sw_ring=%p sw_rsc_ring=%p hw_ring=%p " + "dma_addr=0x%"PRIx64, + rxq->sw_ring, rxq->sw_rsc_ring, rxq->rx_ring, + rxq->rx_ring_phys_addr); /* * Certain constraints must be met in order to use the bulk buffer @@ -3506,6 +3826,84 @@ ixgbe_dev_mq_tx_configure(struct rte_eth_dev *dev) return 0; } +/** + * get_rscctl_maxdesc - Calculate the RSCCTL[n].MAXDESC for PF + * + * Return the RSCCTL[n].MAXDESC for 82599 and x540 PF devices according to the + * spec rev. 3.0 chapter 8.2.3.8.13. + * + * @pool Memory pool of the Rx queue + */ +static inline uint32_t get_rscctl_maxdesc(struct rte_mempool *pool) +{ + struct rte_pktmbuf_pool_private *mp_priv = rte_mempool_get_priv(pool); + + /* MAXDESC * SRRCTL.BSIZEPKT must not exceed 64 KB minus one */ + uint16_t maxdesc = + 65535 / (mp_priv->mbuf_data_room_size - RTE_PKTMBUF_HEADROOM); + + if (maxdesc >= 16) + return IXGBE_RSCCTL_MAXDESC_16; + else if (maxdesc >= 8) + return IXGBE_RSCCTL_MAXDESC_8; + else if (maxdesc >= 4) + return IXGBE_RSCCTL_MAXDESC_4; + else + return IXGBE_RSCCTL_MAXDESC_1; +} + +/* (Taken from FreeBSD tree) +** Setup the correct IVAR register for a particular MSIX interrupt +** (yes this is all very magic and confusing :) +** - entry is the register array entry +** - vector is the MSIX vector for this queue +** - type is RX/TX/MISC +*/ +static void +ixgbe_set_ivar(struct rte_eth_dev *dev, u8 entry, u8 vector, s8 type) +{ + struct ixgbe_hw *hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private); + u32 ivar, index; + + vector |= IXGBE_IVAR_ALLOC_VAL; + + switch (hw->mac.type) { + + case ixgbe_mac_82598EB: + if (type == -1) + entry = IXGBE_IVAR_OTHER_CAUSES_INDEX; + else + entry += (type * 64); + index = (entry >> 2) & 0x1F; + ivar = IXGBE_READ_REG(hw, IXGBE_IVAR(index)); + ivar &= ~(0xFF << (8 * (entry & 0x3))); + ivar |= (vector << (8 * (entry & 0x3))); + IXGBE_WRITE_REG(hw, IXGBE_IVAR(index), ivar); + break; + + case ixgbe_mac_82599EB: + case ixgbe_mac_X540: + if (type == -1) { /* MISC IVAR */ + index = (entry & 1) * 8; + ivar = IXGBE_READ_REG(hw, IXGBE_IVAR_MISC); + ivar &= ~(0xFF << index); + ivar |= (vector << index); + IXGBE_WRITE_REG(hw, IXGBE_IVAR_MISC, ivar); + } else { /* RX/TX IVARS */ + index = (16 * (entry & 1)) + (8 * type); + ivar = IXGBE_READ_REG(hw, IXGBE_IVAR(entry >> 1)); + ivar &= ~(0xFF << index); + ivar |= (vector << index); + IXGBE_WRITE_REG(hw, IXGBE_IVAR(entry >> 1), ivar); + } + + break; + + default: + break; + } +} + void set_rx_function(struct rte_eth_dev *dev) { struct ixgbe_hw *hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private); @@ -3555,6 +3953,25 @@ void set_rx_function(struct rte_eth_dev *dev) dev->rx_pkt_burst = ixgbe_recv_scattered_pkts; } } + + /* + * Initialize the appropriate LRO callback. + * + * If all queues satisfy the bulk allocation preconditions + * (hw->rx_bulk_alloc_allowed is TRUE) then we may use bulk allocation. + * Otherwise use a single allocation version. + */ + if (dev->data->lro) { + if (hw->rx_bulk_alloc_allowed) { + PMD_INIT_LOG(INFO, "LRO is requested. Using a bulk " + "allocation version"); + dev->rx_pkt_burst = ixgbe_recv_pkts_lro_bulk_alloc; + } else { + PMD_INIT_LOG(INFO, "LRO is requested. Using a single " + "allocation version"); + dev->rx_pkt_burst = ixgbe_recv_pkts_lro; + } + } } /* @@ -3573,10 +3990,26 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev) uint32_t maxfrs; uint32_t srrctl; uint32_t rdrxctl; + uint32_t rscctl; + uint32_t psrtype; + uint32_t rfctl; uint32_t rxcsum; uint16_t buf_size; uint16_t i; struct rte_eth_rxmode *rx_conf = &dev->data->dev_conf.rxmode; + struct rte_eth_dev_info dev_info = { 0 }; + bool rsc_capable = false; + + /* Sanity check */ + dev->dev_ops->dev_infos_get(dev, &dev_info); + if (dev_info.rx_offload_capa & DEV_RX_OFFLOAD_TCP_LRO) + rsc_capable = true; + + if (!rsc_capable && rx_conf->enable_lro) { + PMD_INIT_LOG(CRIT, "LRO is requested on HW that doesn't " + "support it"); + return -EINVAL; + } PMD_INIT_FUNC_TRACE(); hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private); @@ -3596,13 +4029,44 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev) IXGBE_WRITE_REG(hw, IXGBE_FCTRL, fctrl); /* + * RFCTL configuration + * + * Since NFS packets coalescing is not supported - clear RFCTL.NFSW_DIS + * and RFCTL.NFSR_DIS when RSC is enabled. + */ + if (rsc_capable) { + rfctl = IXGBE_READ_REG(hw, IXGBE_RFCTL); + if (rx_conf->enable_lro) { + rfctl &= ~(IXGBE_RFCTL_RSC_DIS | IXGBE_RFCTL_NFSW_DIS | + IXGBE_RFCTL_NFSR_DIS); + } else { + rfctl |= IXGBE_RFCTL_RSC_DIS; + } + + IXGBE_WRITE_REG(hw, IXGBE_RFCTL, rfctl); + } + + + /* * Configure CRC stripping, if any. */ hlreg0 = IXGBE_READ_REG(hw, IXGBE_HLREG0); if (rx_conf->hw_strip_crc) hlreg0 |= IXGBE_HLREG0_RXCRCSTRP; - else + else { hlreg0 &= ~IXGBE_HLREG0_RXCRCSTRP; + if (rx_conf->enable_lro) { + /* + * According to chapter of 4.6.7.2.1 of the Spec Rev. + * 3.0 RSC configuration requires HW CRC stripping being + * enabled. If user requested both HW CRC stripping off + * and RSC on - return an error. + */ + PMD_INIT_LOG(CRIT, "LRO can't be enabled when HW CRC " + "is disabled"); + return -EINVAL; + } + } /* * Configure jumbo frame support, if any. @@ -3654,9 +4118,18 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev) * Configure Header Split */ if (rx_conf->header_split) { + /* + * Print a warning if split_hdr_size is less + * than 128 bytes when RSC is requested. + */ + if (rx_conf->enable_lro && + rx_conf->split_hdr_size < 128) + PMD_INIT_LOG(INFO, "split_hdr_size less than " + "128 bytes (%d)!", + rx_conf->split_hdr_size); + if (hw->mac.type == ixgbe_mac_82599EB) { /* Must setup the PSRTYPE register */ - uint32_t psrtype; psrtype = IXGBE_PSRTYPE_TCPHDR | IXGBE_PSRTYPE_UDPHDR | IXGBE_PSRTYPE_IPV4HDR | @@ -3669,7 +4142,20 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev) srrctl |= IXGBE_SRRCTL_DESCTYPE_HDR_SPLIT_ALWAYS; } else #endif + { srrctl = IXGBE_SRRCTL_DESCTYPE_ADV_ONEBUF; + /* + * Following the 4.6.7.2.1 chapter of the 82599/x540 + * Spec if RSC is enabled the SRRCTL[n].BSIZEHEADER + * should be configured even if header split is not + * enabled. In the later case we will configure it 128 + * bytes following the recommendation in the spec. + */ + if (rx_conf->enable_lro) + srrctl |= + ((128 << IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT) & + IXGBE_SRRCTL_BSIZEHDR_MASK); + } /* Set if packets are dropped when no descriptors available */ if (rxq->drop_en) @@ -3686,6 +4172,13 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev) RTE_PKTMBUF_HEADROOM); srrctl |= ((buf_size >> IXGBE_SRRCTL_BSIZEPKT_SHIFT) & IXGBE_SRRCTL_BSIZEPKT_MASK); + + /* + * TODO: Consider setting the Receive Descriptor Minimum + * Threshold Size for and RSC case. This is not an obviously + * beneficiary option but the one worth considering... + */ + IXGBE_WRITE_REG(hw, IXGBE_SRRCTL(rxq->reg_idx), srrctl); buf_size = (uint16_t) ((srrctl & IXGBE_SRRCTL_BSIZEPKT_MASK) << @@ -3698,11 +4191,57 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev) PMD_INIT_LOG(DEBUG, "forcing scatter mode"); dev->data->scattered_rx = 1; } + + /* RSC per-queue configuration */ + if (rx_conf->enable_lro) { + uint32_t eitr; + + rscctl = + IXGBE_READ_REG(hw, IXGBE_RSCCTL(rxq->reg_idx)); + psrtype = + IXGBE_READ_REG(hw, IXGBE_PSRTYPE(rxq->reg_idx)); + eitr = IXGBE_READ_REG(hw, IXGBE_EITR(rxq->reg_idx)); + + rscctl |= IXGBE_RSCCTL_RSCEN; + rscctl |= get_rscctl_maxdesc(rxq->mb_pool); + psrtype |= IXGBE_PSRTYPE_TCPHDR; + + /* + * RSC: Set ITR interval corresponding to 2K ints/s. + * + * Full-sized RSC aggregations for a 10Gb/s link will + * arrive at about 20K aggregation/s rate. + * + * 2K inst/s rate will make only 10% of the + * aggregations to be closed due to the interrupt timer + * expiration for a streaming at wire-speed case. + * + * For a sparse streaming case this setting will yield + * at most 500us latency for a single RSC aggregation. + */ + eitr |= (2000 | IXGBE_EITR_CNT_WDIS); + + IXGBE_WRITE_REG(hw, IXGBE_RSCCTL(rxq->reg_idx), rscctl); + IXGBE_WRITE_REG(hw, IXGBE_PSRTYPE(rxq->reg_idx), + psrtype); + IXGBE_WRITE_REG(hw, IXGBE_EITR(rxq->reg_idx), eitr); + + /* + * RSC requires the mapping of the queue to the + * interrupt vector. + */ + ixgbe_set_ivar(dev, rxq->reg_idx, i, 0); + + rxq->rsc_en = 1; + } } if (rx_conf->enable_scatter) dev->data->scattered_rx = 1; + if (rx_conf->enable_lro) + dev->data->lro = 1; + set_rx_function(dev); /* @@ -3735,6 +4274,19 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev) IXGBE_WRITE_REG(hw, IXGBE_RDRXCTL, rdrxctl); } + /* Finalize RSC configuration */ + if (rx_conf->enable_lro) { + /* + * Follow the instructions in the 4.6.7.2.1 of the Spec Rev. 3.0 + */ + rdrxctl = IXGBE_READ_REG(hw, IXGBE_RDRXCTL); + rdrxctl |= IXGBE_RDRXCTL_RSCACKC; + IXGBE_WRITE_REG(hw, IXGBE_RDRXCTL, rdrxctl); + + PMD_INIT_LOG(INFO, "enabling LRO mode"); + } + + return 0; } diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx.h b/lib/librte_pmd_ixgbe/ixgbe_rxtx.h index 18c9154..09be70e 100644 --- a/lib/librte_pmd_ixgbe/ixgbe_rxtx.h +++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx.h @@ -79,6 +79,10 @@ struct igb_rx_entry { struct rte_mbuf *mbuf; /**< mbuf associated with RX descriptor. */ }; +struct igb_rsc_entry { + struct rte_mbuf *fbuf; /**< First segment of the fragmented packet. */ +}; + /** * Structure associated with each descriptor of the TX ring of a TX queue. */ @@ -105,6 +109,7 @@ struct igb_rx_queue { volatile uint32_t *rdt_reg_addr; /**< RDT register address. */ volatile uint32_t *rdh_reg_addr; /**< RDH register address. */ struct igb_rx_entry *sw_ring; /**< address of RX software ring. */ + struct igb_rsc_entry *sw_rsc_ring; /**< address of RSC software ring. */ struct rte_mbuf *pkt_first_seg; /**< First segment of current packet. */ struct rte_mbuf *pkt_last_seg; /**< Last segment of current packet. */ uint64_t mbuf_initializer; /**< value to init mbufs */ @@ -126,6 +131,7 @@ struct igb_rx_queue { uint8_t port_id; /**< Device port identifier. */ uint8_t crc_len; /**< 0 if CRC stripped, 4 otherwise. */ uint8_t drop_en; /**< If not 0, set SRRCTL.Drop_En. */ + uint8_t rsc_en; /**< If not 0, RSC is enabled. */ uint8_t rx_deferred_start; /**< not in global dev start. */ #ifdef RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC /** need to alloc dummy mbuf, for wraparound when scanning hw ring */ -- 2.1.0