From: Shijith Thotton Date: Sat, 25 Mar 2017 06:24:33 +0000 (+0530) Subject: net/liquidio: add Rx data path X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=3e4b5980e20a62d81045fc777a6dd2aab77c1dfe;p=dpdk.git net/liquidio: add Rx data path Add APIs to receive packets and re-fill ring buffers. Signed-off-by: Shijith Thotton Signed-off-by: Jerin Jacob Signed-off-by: Derek Chickles Signed-off-by: Venkat Koppula Signed-off-by: Srisivasubramanian S Signed-off-by: Mallesham Jatharakonda --- diff --git a/doc/guides/nics/features/liquidio.ini b/doc/guides/nics/features/liquidio.ini index 6c5d8d1a31..554d921550 100644 --- a/doc/guides/nics/features/liquidio.ini +++ b/doc/guides/nics/features/liquidio.ini @@ -4,6 +4,10 @@ ; Refer to default.ini for the full list of available PMD features. ; [Features] +Scattered Rx = Y +CRC offload = Y +L3 checksum offload = Y +L4 checksum offload = Y Multiprocess aware = Y Linux UIO = Y Linux VFIO = Y diff --git a/drivers/net/liquidio/base/lio_hw_defs.h b/drivers/net/liquidio/base/lio_hw_defs.h index 4271730bc8..2db70851a9 100644 --- a/drivers/net/liquidio/base/lio_hw_defs.h +++ b/drivers/net/liquidio/base/lio_hw_defs.h @@ -112,12 +112,24 @@ enum octeon_tag_type { /* used for NIC operations */ #define LIO_OPCODE 1 +/* Subcodes are used by host driver/apps to identify the sub-operation + * for the core. They only need to by unique for a given subsystem. + */ +#define LIO_OPCODE_SUBCODE(op, sub) \ + ((((op) & 0x0f) << 8) | ((sub) & 0x7f)) + /** LIO_OPCODE subcodes */ /* This subcode is sent by core PCI driver to indicate cores are ready. */ +#define LIO_OPCODE_NW_DATA 0x02 /* network packet data */ #define LIO_OPCODE_IF_CFG 0x09 #define LIO_MAX_RX_PKTLEN (64 * 1024) +/* RX(packets coming from wire) Checksum verification flags */ +/* TCP/UDP csum */ +#define LIO_L4_CSUM_VERIFIED 0x1 +#define LIO_IP_CSUM_VERIFIED 0x2 + /* Interface flags communicated between host driver and core app. */ enum lio_ifflags { LIO_IFFLAG_UNICAST = 0x10 diff --git a/drivers/net/liquidio/lio_ethdev.c b/drivers/net/liquidio/lio_ethdev.c index a93fa4a4e7..ebfdf7af6c 100644 --- a/drivers/net/liquidio/lio_ethdev.c +++ b/drivers/net/liquidio/lio_ethdev.c @@ -404,6 +404,8 @@ lio_eth_dev_uninit(struct rte_eth_dev *eth_dev) rte_free(eth_dev->data->mac_addrs); eth_dev->data->mac_addrs = NULL; + eth_dev->rx_pkt_burst = NULL; + return 0; } @@ -415,6 +417,8 @@ lio_eth_dev_init(struct rte_eth_dev *eth_dev) PMD_INIT_FUNC_TRACE(); + eth_dev->rx_pkt_burst = &lio_dev_recv_pkts; + /* Primary does the initialization. */ if (rte_eal_process_type() != RTE_PROC_PRIMARY) return 0; @@ -448,6 +452,7 @@ lio_eth_dev_init(struct rte_eth_dev *eth_dev) lio_dev_err(lio_dev, "MAC addresses memory allocation failed\n"); eth_dev->dev_ops = NULL; + eth_dev->rx_pkt_burst = NULL; return -ENOMEM; } diff --git a/drivers/net/liquidio/lio_rxtx.c b/drivers/net/liquidio/lio_rxtx.c index 9948023a43..9e4da3ab62 100644 --- a/drivers/net/liquidio/lio_rxtx.c +++ b/drivers/net/liquidio/lio_rxtx.c @@ -326,6 +326,386 @@ lio_setup_droq(struct lio_device *lio_dev, int oq_no, int num_descs, return 0; } +static inline uint32_t +lio_droq_get_bufcount(uint32_t buf_size, uint32_t total_len) +{ + uint32_t buf_cnt = 0; + + while (total_len > (buf_size * buf_cnt)) + buf_cnt++; + + return buf_cnt; +} + +/* If we were not able to refill all buffers, try to move around + * the buffers that were not dispatched. + */ +static inline uint32_t +lio_droq_refill_pullup_descs(struct lio_droq *droq, + struct lio_droq_desc *desc_ring) +{ + uint32_t refill_index = droq->refill_idx; + uint32_t desc_refilled = 0; + + while (refill_index != droq->read_idx) { + if (droq->recv_buf_list[refill_index].buffer) { + droq->recv_buf_list[droq->refill_idx].buffer = + droq->recv_buf_list[refill_index].buffer; + desc_ring[droq->refill_idx].buffer_ptr = + desc_ring[refill_index].buffer_ptr; + droq->recv_buf_list[refill_index].buffer = NULL; + desc_ring[refill_index].buffer_ptr = 0; + do { + droq->refill_idx = lio_incr_index( + droq->refill_idx, 1, + droq->max_count); + desc_refilled++; + droq->refill_count--; + } while (droq->recv_buf_list[droq->refill_idx].buffer); + } + refill_index = lio_incr_index(refill_index, 1, + droq->max_count); + } /* while */ + + return desc_refilled; +} + +/* lio_droq_refill + * + * @param lio_dev - pointer to the lio device structure + * @param droq - droq in which descriptors require new buffers. + * + * Description: + * Called during normal DROQ processing in interrupt mode or by the poll + * thread to refill the descriptors from which buffers were dispatched + * to upper layers. Attempts to allocate new buffers. If that fails, moves + * up buffers (that were not dispatched) to form a contiguous ring. + * + * Returns: + * No of descriptors refilled. + * + * Locks: + * This routine is called with droq->lock held. + */ +static uint32_t +lio_droq_refill(struct lio_device *lio_dev, struct lio_droq *droq) +{ + struct lio_droq_desc *desc_ring; + uint32_t desc_refilled = 0; + void *buf = NULL; + + desc_ring = droq->desc_ring; + + while (droq->refill_count && (desc_refilled < droq->max_count)) { + /* If a valid buffer exists (happens if there is no dispatch), + * reuse the buffer, else allocate. + */ + if (droq->recv_buf_list[droq->refill_idx].buffer == NULL) { + buf = lio_recv_buffer_alloc(lio_dev, droq->q_no); + /* If a buffer could not be allocated, no point in + * continuing + */ + if (buf == NULL) + break; + + droq->recv_buf_list[droq->refill_idx].buffer = buf; + } + + desc_ring[droq->refill_idx].buffer_ptr = + lio_map_ring(droq->recv_buf_list[droq->refill_idx].buffer); + /* Reset any previous values in the length field. */ + droq->info_list[droq->refill_idx].length = 0; + + droq->refill_idx = lio_incr_index(droq->refill_idx, 1, + droq->max_count); + desc_refilled++; + droq->refill_count--; + } + + if (droq->refill_count) + desc_refilled += lio_droq_refill_pullup_descs(droq, desc_ring); + + /* if droq->refill_count + * The refill count would not change in pass two. We only moved buffers + * to close the gap in the ring, but we would still have the same no. of + * buffers to refill. + */ + return desc_refilled; +} + +static int +lio_droq_fast_process_packet(struct lio_device *lio_dev, + struct lio_droq *droq, + struct rte_mbuf **rx_pkts) +{ + struct rte_mbuf *nicbuf = NULL; + struct lio_droq_info *info; + uint32_t total_len = 0; + int data_total_len = 0; + uint32_t pkt_len = 0; + union octeon_rh *rh; + int data_pkts = 0; + + info = &droq->info_list[droq->read_idx]; + lio_swap_8B_data((uint64_t *)info, 2); + + if (!info->length) + return -1; + + /* Len of resp hdr in included in the received data len. */ + info->length -= OCTEON_RH_SIZE; + rh = &info->rh; + + total_len += (uint32_t)info->length; + + if (lio_opcode_slow_path(rh)) { + uint32_t buf_cnt; + + buf_cnt = lio_droq_get_bufcount(droq->buffer_size, + (uint32_t)info->length); + droq->read_idx = lio_incr_index(droq->read_idx, buf_cnt, + droq->max_count); + droq->refill_count += buf_cnt; + } else { + if (info->length <= droq->buffer_size) { + if (rh->r_dh.has_hash) + pkt_len = (uint32_t)(info->length - 8); + else + pkt_len = (uint32_t)info->length; + + nicbuf = droq->recv_buf_list[droq->read_idx].buffer; + droq->recv_buf_list[droq->read_idx].buffer = NULL; + droq->read_idx = lio_incr_index( + droq->read_idx, 1, + droq->max_count); + droq->refill_count++; + + if (likely(nicbuf != NULL)) { + nicbuf->data_off = RTE_PKTMBUF_HEADROOM; + nicbuf->nb_segs = 1; + nicbuf->next = NULL; + /* We don't have a way to pass flags yet */ + nicbuf->ol_flags = 0; + if (rh->r_dh.has_hash) { + uint64_t *hash_ptr; + + nicbuf->ol_flags |= PKT_RX_RSS_HASH; + hash_ptr = rte_pktmbuf_mtod(nicbuf, + uint64_t *); + lio_swap_8B_data(hash_ptr, 1); + nicbuf->hash.rss = (uint32_t)*hash_ptr; + nicbuf->data_off += 8; + } + + nicbuf->pkt_len = pkt_len; + nicbuf->data_len = pkt_len; + nicbuf->port = lio_dev->port_id; + /* Store the mbuf */ + rx_pkts[data_pkts++] = nicbuf; + data_total_len += pkt_len; + } + + /* Prefetch buffer pointers when on a cache line + * boundary + */ + if ((droq->read_idx & 3) == 0) { + rte_prefetch0( + &droq->recv_buf_list[droq->read_idx]); + rte_prefetch0( + &droq->info_list[droq->read_idx]); + } + } else { + struct rte_mbuf *first_buf = NULL; + struct rte_mbuf *last_buf = NULL; + + while (pkt_len < info->length) { + int cpy_len = 0; + + cpy_len = ((pkt_len + droq->buffer_size) > + info->length) + ? ((uint32_t)info->length - + pkt_len) + : droq->buffer_size; + + nicbuf = + droq->recv_buf_list[droq->read_idx].buffer; + droq->recv_buf_list[droq->read_idx].buffer = + NULL; + + if (likely(nicbuf != NULL)) { + /* Note the first seg */ + if (!pkt_len) + first_buf = nicbuf; + + nicbuf->data_off = RTE_PKTMBUF_HEADROOM; + nicbuf->nb_segs = 1; + nicbuf->next = NULL; + nicbuf->port = lio_dev->port_id; + /* We don't have a way to pass + * flags yet + */ + nicbuf->ol_flags = 0; + if ((!pkt_len) && (rh->r_dh.has_hash)) { + uint64_t *hash_ptr; + + nicbuf->ol_flags |= + PKT_RX_RSS_HASH; + hash_ptr = rte_pktmbuf_mtod( + nicbuf, uint64_t *); + lio_swap_8B_data(hash_ptr, 1); + nicbuf->hash.rss = + (uint32_t)*hash_ptr; + nicbuf->data_off += 8; + nicbuf->pkt_len = cpy_len - 8; + nicbuf->data_len = cpy_len - 8; + } else { + nicbuf->pkt_len = cpy_len; + nicbuf->data_len = cpy_len; + } + + if (pkt_len) + first_buf->nb_segs++; + + if (last_buf) + last_buf->next = nicbuf; + + last_buf = nicbuf; + } else { + PMD_RX_LOG(lio_dev, ERR, "no buf\n"); + } + + pkt_len += cpy_len; + droq->read_idx = lio_incr_index( + droq->read_idx, + 1, droq->max_count); + droq->refill_count++; + + /* Prefetch buffer pointers when on a + * cache line boundary + */ + if ((droq->read_idx & 3) == 0) { + rte_prefetch0(&droq->recv_buf_list + [droq->read_idx]); + + rte_prefetch0( + &droq->info_list[droq->read_idx]); + } + } + rx_pkts[data_pkts++] = first_buf; + if (rh->r_dh.has_hash) + data_total_len += (pkt_len - 8); + else + data_total_len += pkt_len; + } + + /* Inform upper layer about packet checksum verification */ + struct rte_mbuf *m = rx_pkts[data_pkts - 1]; + + if (rh->r_dh.csum_verified & LIO_IP_CSUM_VERIFIED) + m->ol_flags |= PKT_RX_IP_CKSUM_GOOD; + + if (rh->r_dh.csum_verified & LIO_L4_CSUM_VERIFIED) + m->ol_flags |= PKT_RX_L4_CKSUM_GOOD; + } + + if (droq->refill_count >= droq->refill_threshold) { + int desc_refilled = lio_droq_refill(lio_dev, droq); + + /* Flush the droq descriptor data to memory to be sure + * that when we update the credits the data in memory is + * accurate. + */ + rte_wmb(); + rte_write32(desc_refilled, droq->pkts_credit_reg); + /* make sure mmio write completes */ + rte_wmb(); + } + + info->length = 0; + info->rh.rh64 = 0; + + return data_pkts; +} + +static uint32_t +lio_droq_fast_process_packets(struct lio_device *lio_dev, + struct lio_droq *droq, + struct rte_mbuf **rx_pkts, + uint32_t pkts_to_process) +{ + int ret, data_pkts = 0; + uint32_t pkt; + + for (pkt = 0; pkt < pkts_to_process; pkt++) { + ret = lio_droq_fast_process_packet(lio_dev, droq, + &rx_pkts[data_pkts]); + if (ret < 0) { + lio_dev_err(lio_dev, "Port[%d] DROQ[%d] idx: %d len:0, pkt_cnt: %d\n", + lio_dev->port_id, droq->q_no, + droq->read_idx, pkts_to_process); + break; + } + data_pkts += ret; + } + + rte_atomic64_sub(&droq->pkts_pending, pkt); + + return data_pkts; +} + +static inline uint32_t +lio_droq_check_hw_for_pkts(struct lio_droq *droq) +{ + uint32_t last_count; + uint32_t pkt_count; + + pkt_count = rte_read32(droq->pkts_sent_reg); + + last_count = pkt_count - droq->pkt_count; + droq->pkt_count = pkt_count; + + if (last_count) + rte_atomic64_add(&droq->pkts_pending, last_count); + + return last_count; +} + +uint16_t +lio_dev_recv_pkts(void *rx_queue, + struct rte_mbuf **rx_pkts, + uint16_t budget) +{ + struct lio_droq *droq = rx_queue; + struct lio_device *lio_dev = droq->lio_dev; + uint32_t pkts_processed = 0; + uint32_t pkt_count = 0; + + lio_droq_check_hw_for_pkts(droq); + + pkt_count = rte_atomic64_read(&droq->pkts_pending); + if (!pkt_count) + return 0; + + if (pkt_count > budget) + pkt_count = budget; + + /* Grab the lock */ + rte_spinlock_lock(&droq->lock); + pkts_processed = lio_droq_fast_process_packets(lio_dev, + droq, rx_pkts, + pkt_count); + + if (droq->pkt_count) { + rte_write32(droq->pkt_count, droq->pkts_sent_reg); + droq->pkt_count = 0; + } + + /* Release the spin lock */ + rte_spinlock_unlock(&droq->lock); + + return pkts_processed; +} + /** * lio_init_instr_queue() * @param lio_dev - pointer to the lio device structure. diff --git a/drivers/net/liquidio/lio_rxtx.h b/drivers/net/liquidio/lio_rxtx.h index fc623ad9f7..420b893947 100644 --- a/drivers/net/liquidio/lio_rxtx.h +++ b/drivers/net/liquidio/lio_rxtx.h @@ -515,6 +515,17 @@ lio_map_ring_info(struct lio_droq *droq, uint32_t i) return (uint64_t)dma_addr; } +static inline int +lio_opcode_slow_path(union octeon_rh *rh) +{ + uint16_t subcode1, subcode2; + + subcode1 = LIO_OPCODE_SUBCODE(rh->r.opcode, rh->r.subcode); + subcode2 = LIO_OPCODE_SUBCODE(LIO_OPCODE, LIO_OPCODE_NW_DATA); + + return subcode2 != subcode1; +} + /* Macro to increment index. * Index is incremented by count; if the sum exceeds * max, index is wrapped-around to the start. @@ -533,6 +544,8 @@ lio_incr_index(uint32_t index, uint32_t count, uint32_t max) int lio_setup_droq(struct lio_device *lio_dev, int q_no, int num_descs, int desc_size, struct rte_mempool *mpool, unsigned int socket_id); +uint16_t lio_dev_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, + uint16_t budget); /** Setup instruction queue zero for the device * @param lio_dev which lio device to setup