From: Ophir Munk Date: Sat, 23 Jun 2018 23:17:41 +0000 (+0000) Subject: net/tap: support TSO (TCP Segment Offload) X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=050316a88313e2cc0ac1c9155a04143cbd96a52e;p=dpdk.git net/tap: support TSO (TCP Segment Offload) This commit implements TCP segmentation offload in TAP. librte_gso library is used to segment large TCP payloads (e.g. packets of 64K bytes size) into smaller MTU size buffers. By supporting TSO offload capability in software a TAP device can be used as a failsafe sub device and be paired with another PCI device which supports TSO capability in HW. For more details on librte_gso implementation please refer to dpdk documentation. The number of newly generated TCP TSO segments is limited to 64. Reviewed-by: Raslan Darawsheh Signed-off-by: Ophir Munk Acked-by: Keith Wiles --- diff --git a/drivers/net/tap/Makefile b/drivers/net/tap/Makefile index ccc5c5fc07..3243365356 100644 --- a/drivers/net/tap/Makefile +++ b/drivers/net/tap/Makefile @@ -24,7 +24,7 @@ CFLAGS += -I. CFLAGS += $(WERROR_FLAGS) LDLIBS += -lrte_eal -lrte_mbuf -lrte_mempool -lrte_ring LDLIBS += -lrte_ethdev -lrte_net -lrte_kvargs -lrte_hash -LDLIBS += -lrte_bus_vdev +LDLIBS += -lrte_bus_vdev -lrte_gso CFLAGS += -DTAP_MAX_QUEUES=$(TAP_MAX_QUEUES) diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c index 8903646d68..d137f58d78 100644 --- a/drivers/net/tap/rte_eth_tap.c +++ b/drivers/net/tap/rte_eth_tap.c @@ -17,6 +17,7 @@ #include #include +#include #include #include #include @@ -55,6 +56,12 @@ #define ETH_TAP_CMP_MAC_FMT "0123456789ABCDEFabcdef" #define ETH_TAP_MAC_ARG_FMT ETH_TAP_MAC_FIXED "|" ETH_TAP_USR_MAC_FMT +#define TAP_GSO_MBUFS_PER_CORE 128 +#define TAP_GSO_MBUF_SEG_SIZE 128 +#define TAP_GSO_MBUF_CACHE_SIZE 4 +#define TAP_GSO_MBUFS_NUM \ + (TAP_GSO_MBUFS_PER_CORE * TAP_GSO_MBUF_CACHE_SIZE) + static struct rte_vdev_driver pmd_tap_drv; static struct rte_vdev_driver pmd_tun_drv; @@ -412,7 +419,8 @@ tap_tx_offload_get_queue_capa(void) return DEV_TX_OFFLOAD_MULTI_SEGS | DEV_TX_OFFLOAD_IPV4_CKSUM | DEV_TX_OFFLOAD_UDP_CKSUM | - DEV_TX_OFFLOAD_TCP_CKSUM; + DEV_TX_OFFLOAD_TCP_CKSUM | + DEV_TX_OFFLOAD_TCP_TSO; } /* Finalize l4 checksum calculation */ @@ -480,23 +488,16 @@ tap_tx_l3_cksum(char *packet, uint64_t ol_flags, unsigned int l2_len, } } -/* Callback to handle sending packets from the tap interface - */ -static uint16_t -pmd_tx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) +static inline void +tap_write_mbufs(struct tx_queue *txq, uint16_t num_mbufs, + struct rte_mbuf **pmbufs, + uint16_t *num_packets, unsigned long *num_tx_bytes) { - struct tx_queue *txq = queue; - uint16_t num_tx = 0; - unsigned long num_tx_bytes = 0; - uint32_t max_size; int i; + uint16_t l234_hlen; - if (unlikely(nb_pkts == 0)) - return 0; - - max_size = *txq->mtu + (ETHER_HDR_LEN + ETHER_CRC_LEN + 4); - for (i = 0; i < nb_pkts; i++) { - struct rte_mbuf *mbuf = bufs[num_tx]; + for (i = 0; i < num_mbufs; i++) { + struct rte_mbuf *mbuf = pmbufs[i]; struct iovec iovecs[mbuf->nb_segs + 2]; struct tun_pi pi = { .flags = 0, .proto = 0x00 }; struct rte_mbuf *seg = mbuf; @@ -504,8 +505,7 @@ pmd_tx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) int proto; int n; int j; - int k; /* first index in iovecs for copying segments */ - uint16_t l234_hlen; /* length of layers 2,3,4 headers */ + int k; /* current index in iovecs for copying segments */ uint16_t seg_len; /* length of first segment */ uint16_t nb_segs; uint16_t *l4_cksum; /* l4 checksum (pseudo header + payload) */ @@ -513,10 +513,6 @@ pmd_tx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) uint16_t l4_phdr_cksum = 0; /* TCP/UDP pseudo header checksum */ uint16_t is_cksum = 0; /* in case cksum should be offloaded */ - /* stats.errs will be incremented */ - if (rte_pktmbuf_pkt_len(mbuf) > max_size) - break; - l4_cksum = NULL; if (txq->type == ETH_TUNTAP_TYPE_TUN) { /* @@ -558,8 +554,8 @@ pmd_tx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) if (seg_len < l234_hlen) break; - /* To change checksums, work on a - * copy of l2, l3 l4 headers. + /* To change checksums, work on a * copy of l2, l3 + * headers + l4 pseudo header */ rte_memcpy(m_copy, rte_pktmbuf_mtod(mbuf, void *), l234_hlen); @@ -603,13 +599,90 @@ pmd_tx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) n = writev(txq->fd, iovecs, j); if (n <= 0) break; + (*num_packets)++; + (*num_tx_bytes) += rte_pktmbuf_pkt_len(mbuf); + } +} + +/* Callback to handle sending packets from the tap interface + */ +static uint16_t +pmd_tx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) +{ + struct tx_queue *txq = queue; + uint16_t num_tx = 0; + uint16_t num_packets = 0; + unsigned long num_tx_bytes = 0; + uint32_t max_size; + int i; + + if (unlikely(nb_pkts == 0)) + return 0; + struct rte_mbuf *gso_mbufs[MAX_GSO_MBUFS]; + max_size = *txq->mtu + (ETHER_HDR_LEN + ETHER_CRC_LEN + 4); + for (i = 0; i < nb_pkts; i++) { + struct rte_mbuf *mbuf_in = bufs[num_tx]; + struct rte_mbuf **mbuf; + uint16_t num_mbufs = 0; + uint16_t tso_segsz = 0; + int ret; + uint16_t hdrs_len; + int j; + uint64_t tso; + + tso = mbuf_in->ol_flags & PKT_TX_TCP_SEG; + if (tso) { + struct rte_gso_ctx *gso_ctx = &txq->gso_ctx; + + assert(gso_ctx != NULL); + + /* TCP segmentation implies TCP checksum offload */ + mbuf_in->ol_flags |= PKT_TX_TCP_CKSUM; + + /* gso size is calculated without ETHER_CRC_LEN */ + hdrs_len = mbuf_in->l2_len + mbuf_in->l3_len + + mbuf_in->l4_len; + tso_segsz = mbuf_in->tso_segsz + hdrs_len; + if (unlikely(tso_segsz == hdrs_len) || + tso_segsz > *txq->mtu) { + txq->stats.errs++; + break; + } + gso_ctx->gso_size = tso_segsz; + ret = rte_gso_segment(mbuf_in, /* packet to segment */ + gso_ctx, /* gso control block */ + (struct rte_mbuf **)&gso_mbufs, /* out mbufs */ + RTE_DIM(gso_mbufs)); /* max tso mbufs */ + + /* ret contains the number of new created mbufs */ + if (ret < 0) + break; + + mbuf = gso_mbufs; + num_mbufs = ret; + } else { + /* stats.errs will be incremented */ + if (rte_pktmbuf_pkt_len(mbuf_in) > max_size) + break; + + /* ret 0 indicates no new mbufs were created */ + ret = 0; + mbuf = &mbuf_in; + num_mbufs = 1; + } + + tap_write_mbufs(txq, num_mbufs, mbuf, + &num_packets, &num_tx_bytes); num_tx++; - num_tx_bytes += mbuf->pkt_len; - rte_pktmbuf_free(mbuf); + /* free original mbuf */ + rte_pktmbuf_free(mbuf_in); + /* free tso mbufs */ + for (j = 0; j < ret; j++) + rte_pktmbuf_free(mbuf[j]); } - txq->stats.opackets += num_tx; + txq->stats.opackets += num_packets; txq->stats.errs += nb_pkts - num_tx; txq->stats.obytes += num_tx_bytes; @@ -1070,32 +1143,76 @@ tap_mac_set(struct rte_eth_dev *dev, struct ether_addr *mac_addr) return 0; } +static int +tap_gso_ctx_setup(struct rte_gso_ctx *gso_ctx, struct rte_eth_dev *dev) +{ + uint32_t gso_types; + char pool_name[64]; + + /* + * Create private mbuf pool with TAP_GSO_MBUF_SEG_SIZE bytes + * size per mbuf use this pool for both direct and indirect mbufs + */ + + struct rte_mempool *mp; /* Mempool for GSO packets */ + + /* initialize GSO context */ + gso_types = DEV_TX_OFFLOAD_TCP_TSO; + snprintf(pool_name, sizeof(pool_name), "mp_%s", dev->device->name); + mp = rte_mempool_lookup((const char *)pool_name); + if (!mp) { + mp = rte_pktmbuf_pool_create(pool_name, TAP_GSO_MBUFS_NUM, + TAP_GSO_MBUF_CACHE_SIZE, 0, + RTE_PKTMBUF_HEADROOM + TAP_GSO_MBUF_SEG_SIZE, + SOCKET_ID_ANY); + if (!mp) { + struct pmd_internals *pmd = dev->data->dev_private; + RTE_LOG(DEBUG, PMD, "%s: failed to create mbuf pool for device %s\n", + pmd->name, dev->device->name); + return -1; + } + } + + gso_ctx->direct_pool = mp; + gso_ctx->indirect_pool = mp; + gso_ctx->gso_types = gso_types; + gso_ctx->gso_size = 0; /* gso_size is set in tx_burst() per packet */ + gso_ctx->flag = 0; + + return 0; +} + static int tap_setup_queue(struct rte_eth_dev *dev, struct pmd_internals *internals, uint16_t qid, int is_rx) { + int ret; int *fd; int *other_fd; const char *dir; struct pmd_internals *pmd = dev->data->dev_private; struct rx_queue *rx = &internals->rxq[qid]; struct tx_queue *tx = &internals->txq[qid]; + struct rte_gso_ctx *gso_ctx; if (is_rx) { fd = &rx->fd; other_fd = &tx->fd; dir = "rx"; + gso_ctx = NULL; } else { fd = &tx->fd; other_fd = &rx->fd; dir = "tx"; + gso_ctx = &tx->gso_ctx; } if (*fd != -1) { /* fd for this queue already exists */ TAP_LOG(DEBUG, "%s: fd %d for %s queue qid %d exists", pmd->name, *fd, dir, qid); + gso_ctx = NULL; } else if (*other_fd != -1) { /* Only other_fd exists. dup it */ *fd = dup(*other_fd); @@ -1120,6 +1237,11 @@ tap_setup_queue(struct rte_eth_dev *dev, tx->mtu = &dev->data->mtu; rx->rxmode = &dev->data->dev_conf.rxmode; + if (gso_ctx) { + ret = tap_gso_ctx_setup(gso_ctx, dev); + if (ret) + return -1; + } tx->type = pmd->type; diff --git a/drivers/net/tap/rte_eth_tap.h b/drivers/net/tap/rte_eth_tap.h index 7b21d0d8b7..44e2773f8b 100644 --- a/drivers/net/tap/rte_eth_tap.h +++ b/drivers/net/tap/rte_eth_tap.h @@ -15,6 +15,7 @@ #include #include +#include #include "tap_log.h" #ifdef IFF_MULTI_QUEUE @@ -22,6 +23,7 @@ #else #define RTE_PMD_TAP_MAX_QUEUES 1 #endif +#define MAX_GSO_MBUFS 64 enum rte_tuntap_type { ETH_TUNTAP_TYPE_UNKNOWN, @@ -59,6 +61,7 @@ struct tx_queue { uint16_t *mtu; /* Pointer to MTU from dev_data */ uint16_t csum:1; /* Enable checksum offloading */ struct pkt_stats stats; /* Stats for this TX queue */ + struct rte_gso_ctx gso_ctx; /* GSO context */ }; struct pmd_internals { diff --git a/mk/rte.app.mk b/mk/rte.app.mk index 87a0c80ff2..7bcf6308d1 100644 --- a/mk/rte.app.mk +++ b/mk/rte.app.mk @@ -38,8 +38,6 @@ _LDLIBS-$(CONFIG_RTE_LIBRTE_PORT) += -lrte_port _LDLIBS-$(CONFIG_RTE_LIBRTE_PDUMP) += -lrte_pdump _LDLIBS-$(CONFIG_RTE_LIBRTE_DISTRIBUTOR) += -lrte_distributor _LDLIBS-$(CONFIG_RTE_LIBRTE_IP_FRAG) += -lrte_ip_frag -_LDLIBS-$(CONFIG_RTE_LIBRTE_GRO) += -lrte_gro -_LDLIBS-$(CONFIG_RTE_LIBRTE_GSO) += -lrte_gso _LDLIBS-$(CONFIG_RTE_LIBRTE_METER) += -lrte_meter _LDLIBS-$(CONFIG_RTE_LIBRTE_LPM) += -lrte_lpm # librte_acl needs --whole-archive because of weak functions @@ -61,6 +59,8 @@ endif _LDLIBS-y += --whole-archive _LDLIBS-$(CONFIG_RTE_LIBRTE_CFGFILE) += -lrte_cfgfile +_LDLIBS-$(CONFIG_RTE_LIBRTE_GRO) += -lrte_gro +_LDLIBS-$(CONFIG_RTE_LIBRTE_GSO) += -lrte_gso _LDLIBS-$(CONFIG_RTE_LIBRTE_HASH) += -lrte_hash _LDLIBS-$(CONFIG_RTE_LIBRTE_MEMBER) += -lrte_member _LDLIBS-$(CONFIG_RTE_LIBRTE_VHOST) += -lrte_vhost