Signed-off-by: Alejandro Lucero <alejandro.lucero at netronome.com>
Signed-off-by: Rolf Neugebauer <rolf.neugebauer at netronome.com>
---
drivers/net/nfp/nfp_net.c | 993 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 993 insertions(+)
diff --git a/drivers/net/nfp/nfp_net.c b/drivers/net/nfp/nfp_net.c
index 18067c0..7e30774 100644
--- a/drivers/net/nfp/nfp_net.c
+++ b/drivers/net/nfp/nfp_net.c
@@ -74,8 +74,25 @@
static void nfp_net_close(struct rte_eth_dev *dev);
static int nfp_net_configure(struct rte_eth_dev *dev);
static int nfp_net_init(struct rte_eth_dev *eth_dev);
+static int nfp_net_rx_fill_freelist(struct nfp_net_rxq *rxq);
+static uint32_t nfp_net_rx_queue_count(struct rte_eth_dev *dev,
+ uint16_t queue_idx);
+static uint16_t nfp_net_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
+ uint16_t nb_pkts);
+static void nfp_net_rx_queue_release(void *rxq);
+static int nfp_net_rx_queue_setup(struct rte_eth_dev *dev, uint16_t queue_idx,
+ uint16_t nb_desc, unsigned int socket_id,
+ const struct rte_eth_rxconf *rx_conf,
+ struct rte_mempool *mp);
+static int nfp_net_tx_free_bufs(struct nfp_net_txq *txq);
+static void nfp_net_tx_queue_release(void *txq);
+static int nfp_net_tx_queue_setup(struct rte_eth_dev *dev, uint16_t queue_idx,
+ uint16_t nb_desc, unsigned int socket_id,
+ const struct rte_eth_txconf *tx_conf);
static int nfp_net_start(struct rte_eth_dev *dev);
static void nfp_net_stop(struct rte_eth_dev *dev);
+static uint16_t nfp_net_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
+ uint16_t nb_pkts);
/*
* The offset of the queue controller queues in the PCIe Target. These
@@ -186,6 +203,100 @@ nn_cfg_writeq(struct nfp_net_hw *hw, int off, uint64_t
val)
nn_writeq(rte_cpu_to_le_64(val), hw->ctrl_bar + off);
}
+/* Creating memzone for hardware rings. */
+static const struct rte_memzone *
+ring_dma_zone_reserve(struct rte_eth_dev *dev, const char *ring_name,
+ uint16_t queue_id, uint32_t ring_size, int socket_id)
+{
+ char z_name[RTE_MEMZONE_NAMESIZE];
+ const struct rte_memzone *mz;
+
+ snprintf(z_name, sizeof(z_name), "%s_%s_%d_%d",
+ dev->driver->pci_drv.name,
+ ring_name, dev->data->port_id, queue_id);
+
+ mz = rte_memzone_lookup(z_name);
+ if (mz)
+ return mz;
+
+ return rte_memzone_reserve_aligned(z_name, ring_size, socket_id, 0,
+ NFP_MEMZONE_ALIGN);
+}
+
+static void
+nfp_net_rx_queue_release_mbufs(struct nfp_net_rxq *rxq)
+{
+ unsigned i;
+
+ if (rxq->rxbufs == NULL)
+ return;
+
+ for (i = 0; i < rxq->rx_count; i++) {
+ if (rxq->rxbufs[i].mbuf) {
+ rte_pktmbuf_free_seg(rxq->rxbufs[i].mbuf);
+ rxq->rxbufs[i].mbuf = NULL;
+ }
+ }
+}
+
+static void
+nfp_net_rx_queue_release(void *rx_queue)
+{
+ struct nfp_net_rxq *rxq = rx_queue;
+
+ if (rxq) {
+ nfp_net_rx_queue_release_mbufs(rxq);
+ rte_free(rxq->rxbufs);
+ rte_free(rxq);
+ }
+}
+
+static void
+nfp_net_reset_rx_queue(struct nfp_net_rxq *rxq)
+{
+ nfp_net_rx_queue_release_mbufs(rxq);
+ rxq->wr_p = 0;
+ rxq->rd_p = 0;
+ rxq->nb_rx_hold = 0;
+}
+
+static void
+nfp_net_tx_queue_release_mbufs(struct nfp_net_txq *txq)
+{
+ unsigned i;
+
+ if (txq->txbufs == NULL)
+ return;
+
+ for (i = 0; i < txq->tx_count; i++) {
+ if (txq->txbufs[i].mbuf) {
+ rte_pktmbuf_free_seg(txq->txbufs[i].mbuf);
+ txq->txbufs[i].mbuf = NULL;
+ }
+ }
+}
+
+static void
+nfp_net_tx_queue_release(void *tx_queue)
+{
+ struct nfp_net_txq *txq = tx_queue;
+
+ if (txq) {
+ nfp_net_tx_queue_release_mbufs(txq);
+ rte_free(txq->txbufs);
+ rte_free(txq);
+ }
+}
+
+static void
+nfp_net_reset_tx_queue(struct nfp_net_txq *txq)
+{
+ nfp_net_tx_queue_release_mbufs(txq);
+ txq->wr_p = 0;
+ txq->rd_p = 0;
+ txq->tail = 0;
+}
+
static int
__nfp_net_reconfig(struct nfp_net_hw *hw, uint32_t update)
{
@@ -423,6 +534,18 @@ nfp_net_disable_queues(struct rte_eth_dev *dev)
hw->ctrl = new_ctrl;
}
+static int
+nfp_net_rx_freelist_setup(struct rte_eth_dev *dev)
+{
+ int i;
+
+ for (i = 0; i < dev->data->nb_rx_queues; i++) {
+ if (nfp_net_rx_fill_freelist(dev->data->rx_queues[i]) < 0)
+ return -1;
+ }
+ return 0;
+}
+
static void
nfp_net_params_setup(struct nfp_net_hw *hw)
{
@@ -451,6 +574,7 @@ nfp_net_start(struct rte_eth_dev *dev)
{
uint32_t new_ctrl, update = 0;
struct nfp_net_hw *hw;
+ int ret;
hw = NFP_NET_DEV_PRIVATE_TO_HW(dev->data->dev_private);
@@ -476,18 +600,58 @@ nfp_net_start(struct rte_eth_dev *dev)
if (nfp_net_reconfig(hw, new_ctrl, update) < 0)
return -EIO;
+ /*
+ * Allocating rte mbuffs for configured rx queues.
+ * This requires queues being enabled before
+ */
+ if (nfp_net_rx_freelist_setup(dev) < 0) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
hw->ctrl = new_ctrl;
return 0;
+
+error:
+ /*
+ * An error returned by this function should mean the app
+ * exiting and then the system releasing all the memory
+ * allocated even memory coming from hugepages.
+ *
+ * The device could be enabled at this point with some queues
+ * ready for getting packets. This is true if the call to
+ * nfp_net_rx_freelist_setup() succeeds for some queues but
+ * fails for subsequent queues.
+ *
+ * This should make the app exiting but better if we tell the
+ * device first.
+ */
+ nfp_net_disable_queues(dev);
+
+ return ret;
}
/* Stop device: disable rx and tx functions to allow for reconfiguring. */
static void
nfp_net_stop(struct rte_eth_dev *dev)
{
+ int i;
+
PMD_INIT_LOG(DEBUG, "Stop\n");
nfp_net_disable_queues(dev);
+
+ /* Clear queues */
+ for (i = 0; i < dev->data->nb_tx_queues; i++) {
+ nfp_net_reset_tx_queue(
+ (struct nfp_net_txq *)dev->data->tx_queues[i]);
+ }
+
+ for (i = 0; i < dev->data->nb_rx_queues; i++) {
+ nfp_net_reset_rx_queue(
+ (struct nfp_net_rxq *)dev->data->rx_queues[i]);
+ }
}
/* Reset and stop device. The device can not be restarted. */
@@ -515,12 +679,839 @@ nfp_net_close(struct rte_eth_dev *dev)
*/
}
+static uint32_t
+nfp_net_rx_queue_count(struct rte_eth_dev *dev, uint16_t queue_idx)
+{
+ struct nfp_net_rxq *rxq;
+ struct nfp_net_rx_desc *rxds;
+ uint32_t idx;
+ uint32_t count;
+
+ rxq = (struct nfp_net_rxq *)dev->data->rx_queues[queue_idx];
+
+ if (rxq == NULL) {
+ PMD_INIT_LOG(ERR, "Bad queue: %u\n", queue_idx);
+ return 0;
+ }
+
+ idx = rxq->rd_p % rxq->rx_count;
+ rxds = &rxq->rxds[idx];
+
+ count = 0;
+
+ /*
+ * Other PMDs are just checking the DD bit in intervals of 4
+ * descriptors and counting all four if the first has the DD
+ * bit on. Of course, this is not accurate but can be good for
+ * perfomance. But ideally that should be done in descriptors
+ * chunks belonging to the same cache line
+ */
+
+ while (count < rxq->rx_count) {
+ rxds = &rxq->rxds[idx];
+ if ((rxds->rxd.meta_len_dd & PCIE_DESC_RX_DD) == 0)
+ break;
+
+ count++;
+ idx++;
+
+ /* Wrapping? */
+ if ((idx) == rxq->rx_count)
+ idx = 0;
+ }
+
+ return count;
+}
+
+static int
+nfp_net_rx_queue_setup(struct rte_eth_dev *dev,
+ uint16_t queue_idx, uint16_t nb_desc,
+ unsigned int socket_id,
+ const struct rte_eth_rxconf *rx_conf,
+ struct rte_mempool *mp)
+{
+ const struct rte_memzone *tz;
+ struct nfp_net_rxq *rxq;
+ struct nfp_net_hw *hw;
+
+ hw = NFP_NET_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+ PMD_INIT_FUNC_TRACE();
+
+ /* Validating number of descriptors */
+ if (((nb_desc * sizeof(struct nfp_net_rx_desc)) % 128) != 0 ||
+ (nb_desc > NFP_NET_MAX_RX_DESC) ||
+ (nb_desc < NFP_NET_MIN_RX_DESC)) {
+ RTE_LOG(ERR, PMD, "Wrong nb_desc value\n");
+ return (-EINVAL);
+ }
+
+ /*
+ * Free memory prior to re-allocation if needed. This is the case after
+ * calling nfp_net_stop
+ */
+ if (dev->data->rx_queues[queue_idx]) {
+ nfp_net_rx_queue_release(dev->data->rx_queues[queue_idx]);
+ dev->data->rx_queues[queue_idx] = NULL;
+ }
+
+ /* Allocating rx queue data structure */
+ rxq = rte_zmalloc_socket("ethdev RX queue", sizeof(struct nfp_net_rxq),
+ RTE_CACHE_LINE_SIZE, socket_id);
+ if (rxq == NULL)
+ return (-ENOMEM);
+
+ /* Hw queues mapping based on firmware confifguration */
+ rxq->qidx = queue_idx;
+ rxq->fl_qcidx = queue_idx * hw->stride_rx;
+ rxq->rx_qcidx = rxq->fl_qcidx + (hw->stride_rx - 1);
+ rxq->qcp_fl = hw->rx_bar + NFP_QCP_QUEUE_OFF(rxq->fl_qcidx);
+ rxq->qcp_rx = hw->rx_bar + NFP_QCP_QUEUE_OFF(rxq->rx_qcidx);
+
+ /*
+ * Tracking mbuf size for detecting a potential mbuf overflow due to
+ * RX offset
+ */
+ rxq->mem_pool = mp;
+ rxq->mbuf_size = rxq->mem_pool->elt_size;
+ rxq->mbuf_size -= (sizeof(struct rte_mbuf) + RTE_PKTMBUF_HEADROOM);
+ hw->flbufsz = rxq->mbuf_size;
+
+ rxq->rx_count = nb_desc;
+ rxq->port_id = dev->data->port_id;
+ rxq->rx_free_thresh = rx_conf->rx_free_thresh;
+ rxq->crc_len = (uint8_t) ((dev->data->dev_conf.rxmode.hw_strip_crc) ? 0
+ : ETHER_CRC_LEN);
+ rxq->drop_en = rx_conf->rx_drop_en;
+
+ /*
+ * Allocate RX ring hardware descriptors. A memzone large enough to
+ * handle the maximum ring size is allocated in order to allow for
+ * resizing in later calls to the queue setup function.
+ */
+ tz = ring_dma_zone_reserve(dev, "rx_ring", queue_idx,
+ sizeof(struct nfp_net_rx_desc) *
+ NFP_NET_MAX_RX_DESC, socket_id);
+
+ if (tz == NULL) {
+ RTE_LOG(ERR, PMD, "Error allocatig rx dma\n");
+ nfp_net_rx_queue_release(rxq);
+ return (-ENOMEM);
+ }
+
+ /* Saving physical and virtual addresses for the RX ring */
+ rxq->dma = (uint64_t)tz->phys_addr;
+ rxq->rxds = (struct nfp_net_rx_desc *)tz->addr;
+
+ /* mbuf pointers array for referencing mbufs linked to RX descriptors */
+ rxq->rxbufs = rte_zmalloc_socket("rxq->rxbufs",
+ sizeof(*rxq->rxbufs) * nb_desc,
+ RTE_CACHE_LINE_SIZE, socket_id);
+ if (rxq->rxbufs == NULL) {
+ nfp_net_rx_queue_release(rxq);
+ return (-ENOMEM);
+ }
+
+ PMD_RX_LOG(DEBUG, "rxbufs=%p hw_ring=%p dma_addr=0x%" PRIx64 "\n",
+ rxq->rxbufs, rxq->rxds, (unsigned long int)rxq->dma);
+
+ nfp_net_reset_rx_queue(rxq);
+
+ dev->data->rx_queues[queue_idx] = rxq;
+ rxq->hw = hw;
+
+ /*
+ * Telling the HW about the physical address of the RX ring and number
+ * of descriptors in log2 format
+ */
+ nn_cfg_writeq(hw, NFP_NET_CFG_RXR_ADDR(queue_idx), rxq->dma);
+ nn_cfg_writeb(hw, NFP_NET_CFG_RXR_SZ(queue_idx), log2(nb_desc));
+
+ return 0;
+}
+
+static int
+nfp_net_rx_fill_freelist(struct nfp_net_rxq *rxq)
+{
+ struct nfp_net_rx_buff *rxe = rxq->rxbufs;
+ uint64_t dma_addr;
+ unsigned i;
+
+ PMD_RX_LOG(DEBUG, "nfp_net_rx_fill_freelist for %u descriptors\n",
+ rxq->rx_count);
+
+ for (i = 0; i < rxq->rx_count; i++) {
+ struct nfp_net_rx_desc *rxd;
+ struct rte_mbuf *mbuf = rte_pktmbuf_alloc(rxq->mem_pool);
+
+ if (mbuf == NULL) {
+ RTE_LOG(ERR, PMD, "RX mbuf alloc failed queue_id=%u\n",
+ (unsigned)rxq->qidx);
+ return (-ENOMEM);
+ }
+
+ dma_addr = rte_cpu_to_le_64(RTE_MBUF_DMA_ADDR_DEFAULT(mbuf));
+
+ rxd = &rxq->rxds[i];
+ rxd->fld.dd = 0;
+ rxd->fld.dma_addr_hi = (dma_addr >> 32) & 0xff;
+ rxd->fld.dma_addr_lo = dma_addr & 0xffffffff;
+ rxe[i].mbuf = mbuf;
+ PMD_RX_LOG(DEBUG, "[%d]: %" PRIx64 "\n", i, dma_addr);
+
+ rxq->wr_p++;
+ }
+
+ /* Make sure all writes are flushed before telling the hardware */
+ rte_wmb();
+
+ /* Not advertising the whole ring as the firmware gets confused if so */
+ PMD_RX_LOG(DEBUG, "Increment FL write pointer in %u\n",
+ rxq->rx_count - 1);
+
+ nfp_qcp_ptr_add(rxq->qcp_fl, NFP_QCP_WRITE_PTR, rxq->rx_count - 1);
+
+ return 0;
+}
+
+static int
+nfp_net_tx_queue_setup(struct rte_eth_dev *dev, uint16_t queue_idx,
+ uint16_t nb_desc, unsigned int socket_id,
+ const struct rte_eth_txconf *tx_conf)
+{
+ const struct rte_memzone *tz;
+ struct nfp_net_txq *txq;
+ uint16_t tx_free_thresh;
+ struct nfp_net_hw *hw;
+
+ hw = NFP_NET_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+ PMD_INIT_FUNC_TRACE();
+
+ /* Validating number of descriptors */
+ if (((nb_desc * sizeof(struct nfp_net_tx_desc)) % 128) != 0 ||
+ (nb_desc > NFP_NET_MAX_TX_DESC) ||
+ (nb_desc < NFP_NET_MIN_TX_DESC)) {
+ RTE_LOG(ERR, PMD, "Wrong nb_desc value\n");
+ return -EINVAL;
+ }
+
+ tx_free_thresh = (uint16_t)((tx_conf->tx_free_thresh) ?
+ tx_conf->tx_free_thresh :
+ DEFAULT_TX_FREE_THRESH);
+
+ if (tx_free_thresh > (nb_desc)) {
+ RTE_LOG(ERR, PMD,
+ "tx_free_thresh must be less than the number of TX "
+ "descriptors. (tx_free_thresh=%u port=%d "
+ "queue=%d)\n", (unsigned int)tx_free_thresh,
+ (int)dev->data->port_id, (int)queue_idx);
+ return -(EINVAL);
+ }
+
+ /*
+ * Free memory prior to re-allocation if needed. This is the case after
+ * calling nfp_net_stop
+ */
+ if (dev->data->tx_queues[queue_idx]) {
+ PMD_TX_LOG(DEBUG, "Freeing memory prior to re-allocation %d\n",
+ queue_idx);
+ nfp_net_tx_queue_release(dev->data->tx_queues[queue_idx]);
+ dev->data->tx_queues[queue_idx] = NULL;
+ }
+
+ /* Allocating tx queue data structure */
+ txq = rte_zmalloc_socket("ethdev TX queue", sizeof(struct nfp_net_txq),
+ RTE_CACHE_LINE_SIZE, socket_id);
+ if (txq == NULL) {
+ RTE_LOG(ERR, PMD, "Error allocating tx dma\n");
+ return (-ENOMEM);
+ }
+
+ /*
+ * Allocate TX ring hardware descriptors. A memzone large enough to
+ * handle the maximum ring size is allocated in order to allow for
+ * resizing in later calls to the queue setup function.
+ */
+ tz = ring_dma_zone_reserve(dev, "tx_ring", queue_idx,
+ sizeof(struct nfp_net_tx_desc) *
+ NFP_NET_MAX_TX_DESC, socket_id);
+ if (tz == NULL) {
+ RTE_LOG(ERR, PMD, "Error allocating tx dma\n");
+ nfp_net_tx_queue_release(txq);
+ return (-ENOMEM);
+ }
+
+ txq->tx_count = nb_desc;
+ txq->tail = 0;
+ txq->tx_free_thresh = tx_free_thresh;
+ txq->tx_pthresh = tx_conf->tx_thresh.pthresh;
+ txq->tx_hthresh = tx_conf->tx_thresh.hthresh;
+ txq->tx_wthresh = tx_conf->tx_thresh.wthresh;
+
+ /* queue mapping based on firmware configuration */
+ txq->qidx = queue_idx;
+ txq->tx_qcidx = queue_idx * hw->stride_tx;
+ txq->qcp_q = hw->tx_bar + NFP_QCP_QUEUE_OFF(txq->tx_qcidx);
+
+ txq->port_id = dev->data->port_id;
+ txq->txq_flags = tx_conf->txq_flags;
+
+ /* Saving physical and virtual addresses for the TX ring */
+ txq->dma = (uint64_t)tz->phys_addr;
+ txq->txds = (struct nfp_net_tx_desc *)tz->addr;
+
+ /* mbuf pointers array for referencing mbufs linked to TX descriptors */
+ txq->txbufs = rte_zmalloc_socket("txq->txbufs",
+ sizeof(*txq->txbufs) * nb_desc,
+ RTE_CACHE_LINE_SIZE, socket_id);
+ if (txq->txbufs == NULL) {
+ nfp_net_tx_queue_release(txq);
+ return (-ENOMEM);
+ }
+ PMD_TX_LOG(DEBUG, "txbufs=%p hw_ring=%p dma_addr=0x%" PRIx64 "\n",
+ txq->txbufs, txq->txds, (unsigned long int)txq->dma);
+
+ nfp_net_reset_tx_queue(txq);
+
+ dev->data->tx_queues[queue_idx] = txq;
+ txq->hw = hw;
+
+ /*
+ * Telling the HW about the physical address of the TX ring and number
+ * of descriptors in log2 format
+ */
+ nn_cfg_writeq(hw, NFP_NET_CFG_TXR_ADDR(queue_idx), txq->dma);
+ nn_cfg_writeb(hw, NFP_NET_CFG_TXR_SZ(queue_idx), log2(nb_desc));
+
+ return 0;
+}
+
+/* nfp_net_tx_cksum - Set TX CSUM offload flags in TX descriptor */
+static inline void
+nfp_net_tx_cksum(struct nfp_net_txq *txq, struct nfp_net_tx_desc *txd,
+ struct rte_mbuf *mb)
+{
+ uint16_t ol_flags;
+ struct nfp_net_hw *hw = txq->hw;
+
+ if (!(hw->cap & NFP_NET_CFG_CTRL_TXCSUM))
+ return;
+
+ ol_flags = mb->ol_flags;
+
+ /* IPv6 does not need checksum */
+ if (ol_flags & PKT_TX_IP_CKSUM)
+ txd->flags |= PCIE_DESC_TX_IP4_CSUM;
+
+ switch (ol_flags & PKT_TX_L4_MASK) {
+ case PKT_TX_UDP_CKSUM:
+ txd->flags |= PCIE_DESC_TX_UDP_CSUM;
+ break;
+ case PKT_TX_TCP_CKSUM:
+ txd->flags |= PCIE_DESC_TX_TCP_CSUM;
+ break;
+ }
+
+ txd->flags |= PCIE_DESC_TX_CSUM;
+}
+
+/* nfp_net_rx_cksum - set mbuf checksum flags based on RX descriptor flags */
+static inline void
+nfp_net_rx_cksum(struct nfp_net_rxq *rxq, struct nfp_net_rx_desc *rxd,
+ struct rte_mbuf *mb)
+{
+ struct nfp_net_hw *hw = rxq->hw;
+
+ if (!(hw->ctrl & NFP_NET_CFG_CTRL_RXCSUM))
+ return;
+
+ /* If IPv4 and IP checksum error, fail */
+ if ((rxd->rxd.flags & PCIE_DESC_RX_IP4_CSUM) &&
+ !(rxd->rxd.flags & PCIE_DESC_RX_IP4_CSUM_OK))
+ mb->ol_flags |= PKT_RX_IP_CKSUM_BAD;
+
+ /* If neither UDP nor TCP return */
+ if (!(rxd->rxd.flags & PCIE_DESC_RX_TCP_CSUM) &&
+ !(rxd->rxd.flags & PCIE_DESC_RX_UDP_CSUM))
+ return;
+
+ if ((rxd->rxd.flags & PCIE_DESC_RX_TCP_CSUM) &&
+ !(rxd->rxd.flags & PCIE_DESC_RX_TCP_CSUM_OK))
+ mb->ol_flags |= PKT_RX_L4_CKSUM_BAD;
+
+ if ((rxd->rxd.flags & PCIE_DESC_RX_UDP_CSUM) &&
+ !(rxd->rxd.flags & PCIE_DESC_RX_UDP_CSUM_OK))
+ mb->ol_flags |= PKT_RX_L4_CKSUM_BAD;
+}
+
+#define NFP_HASH_OFFSET ((uint8_t *)mbuf->buf_addr + mbuf->data_off - 4)
+#define NFP_HASH_TYPE_OFFSET ((uint8_t *)mbuf->buf_addr + mbuf->data_off - 8)
+
+/*
+ * nfp_net_set_hash - Set mbuf hash data
+ *
+ * The RSS hash and hash-type are pre-pended to the packet data.
+ * Extract and decode it and set the mbuf fields.
+ */
+static inline void
+nfp_net_set_hash(struct nfp_net_rxq *rxq, struct nfp_net_rx_desc *rxd,
+ struct rte_mbuf *mbuf)
+{
+ uint32_t hash;
+ uint32_t hash_type;
+ struct nfp_net_hw *hw = rxq->hw;
+
+ if (!(hw->ctrl & NFP_NET_CFG_CTRL_RSS))
+ return;
+
+ if (!(rxd->rxd.flags & PCIE_DESC_RX_RSS))
+ return;
+
+ hash = rte_be_to_cpu_32(*(uint32_t *)NFP_HASH_OFFSET);
+ hash_type = rte_be_to_cpu_32(*(uint32_t *)NFP_HASH_TYPE_OFFSET);
+
+ /*
+ * hash type is sharing the same word with input port info
+ * 31-8: input port
+ * 7:0: hash type
+ */
+ hash_type &= 0xff;
+ mbuf->hash.rss = hash;
+ mbuf->ol_flags |= PKT_RX_RSS_HASH;
+
+ switch (hash_type) {
+ case NFP_NET_RSS_IPV4:
+ mbuf->packet_type |= RTE_PTYPE_INNER_L3_IPV4;
+ break;
+ case NFP_NET_RSS_IPV6:
+ mbuf->packet_type |= RTE_PTYPE_INNER_L3_IPV6;
+ break;
+ case NFP_NET_RSS_IPV6_EX:
+ mbuf->packet_type |= RTE_PTYPE_INNER_L3_IPV6_EXT;
+ break;
+ default:
+ mbuf->packet_type |= RTE_PTYPE_INNER_L4_MASK;
+ }
+}
+
+/* nfp_net_check_port - Set mbuf in_port field */
+static void
+nfp_net_check_port(struct nfp_net_rx_desc *rxd, struct rte_mbuf *mbuf)
+{
+ uint32_t port;
+
+ if (!(rxd->rxd.flags & PCIE_DESC_RX_INGRESS_PORT)) {
+ mbuf->port = 0;
+ return;
+ }
+
+ port = rte_be_to_cpu_32(*(uint32_t *)((uint8_t *)mbuf->buf_addr +
+ mbuf->data_off - 8));
+
+ /*
+ * hash type is sharing the same word with input port info
+ * 31-8: input port
+ * 7:0: hash type
+ */
+ port = (uint8_t)(port >> 8);
+ mbuf->port = port;
+}
+
+static inline void
+nfp_net_mbuf_alloc_failed(struct nfp_net_rxq *rxq)
+{
+ rte_eth_devices[rxq->port_id].data->rx_mbuf_alloc_failed++;
+}
+
+#define NFP_DESC_META_LEN(d) (d->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK)
+
+/*
+ * RX path design:
+ *
+ * There are some decissions to take:
+ * 1) How to check DD RX descriptors bit
+ * 2) How and when to allocate new mbufs
+ *
+ * Current implementation checks just one single DD bit each loop. As each
+ * descriptor is 8 bytes, it is likely a good idea to check descriptors in
+ * a single cache line instead. Tests with this change have not shown any
+ * performance improvement but it requires further investigation. For example,
+ * depending on which descriptor is next, the number of descriptors could be
+ * less than 8 for just checking those in the same cache line. This implies
+ * extra work which could be counterproductive by itself. Indeed, last firmware
+ * changes are just doing this: writing several descriptors with the DD bit
+ * for saving PCIe bandwidth and DMA operations from the NFP.
+ *
+ * Mbuf allocation is done when a new packet is received. Then the descriptor
+ * is automatically linked with the new mbuf and the old one is given to the
+ * user. The main drawback with this design is mbuf allocation is heavier than
+ * using bulk allocations allowed by DPDK with rte_mempool_get_bulk. From the
+ * cache point of view it does not seem allocating the mbuf early on as we are
+ * doing now have any benefit at all. Again, tests with this change have not
+ * shown any improvement. Also, rte_mempool_get_bulk returns all or nothing
+ * so looking at the implications of this type of allocation should be studied
+ * deeply
+ */
+
+static uint16_t
+nfp_net_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
+{
+ struct nfp_net_rxq *rxq;
+ struct nfp_net_rx_desc *rxds;
+ struct nfp_net_rx_buff *rxb;
+ struct nfp_net_hw *hw;
+ struct rte_mbuf *mb;
+ struct rte_mbuf *new_mb;
+ int idx;
+ uint16_t nb_hold;
+ uint64_t dma_addr;
+ int avail;
+
+ rxq = rx_queue;
+ if (unlikely(rxq == NULL)) {
+ /*
+ * DPDK just checks the queue is lower than max queues
+ * enabled. But the queue needs to be configured
+ */
+ RTE_LOG(ERR, PMD, "RX Bad queue\n");
+ return -EINVAL;
+ }
+
+ hw = rxq->hw;
+ avail = 0;
+ nb_hold = 0;
+
+ while (avail < nb_pkts) {
+ idx = rxq->rd_p % rxq->rx_count;
+
+ rxb = &rxq->rxbufs[idx];
+ if (unlikely(rxb == NULL)) {
+ RTE_LOG(ERR, PMD, "rxb does not exist!\n");
+ break;
+ }
+
+ /*
+ * Memory barrier to ensure that we won't do other
+ * reads before the DD bit.
+ */
+ rte_rmb();
+
+ rxds = &rxq->rxds[idx];
+ if ((rxds->rxd.meta_len_dd & PCIE_DESC_RX_DD) == 0)
+ break;
+
+ /*
+ * We got a packet. Let's alloc a new mbuff for refilling the
+ * free descriptor ring as soon as possible
+ */
+ new_mb = rte_pktmbuf_alloc(rxq->mem_pool);
+ if (unlikely(new_mb == NULL)) {
+ RTE_LOG(DEBUG, PMD, "RX mbuf alloc failed port_id=%u "
+ "queue_id=%u\n", (unsigned)rxq->port_id,
+ (unsigned)rxq->qidx);
+ nfp_net_mbuf_alloc_failed(rxq);
+ break;
+ }
+
+ nb_hold++;
+
+ /*
+ * Grab the mbuff and refill the descriptor with the
+ * previously allocated mbuff
+ */
+ mb = rxb->mbuf;
+ rxb->mbuf = new_mb;
+
+ PMD_RX_LOG(DEBUG, "Packet len: %u, mbuf_size: %u\n",
+ rxds->rxd.data_len, rxq->mbuf_size);
+
+ /* Size of this segment */
+ mb->data_len = rxds->rxd.data_len - NFP_DESC_META_LEN(rxds);
+ /* Size of the whole packet. We just support 1 segment */
+ mb->pkt_len = rxds->rxd.data_len - NFP_DESC_META_LEN(rxds);
+
+ if (unlikely((mb->data_len + hw->rx_offset) >
+ rxq->mbuf_size)) {
+ /*
+ * This should not happen and the user has the
+ * responsibility of avoiding it. But we have
+ * to give some info about the error
+ */
+ RTE_LOG(ERR, PMD,
+ "mbuf overflow likely due to the RX offset.\n"
+ "\t\tYour mbuf size should have extra space for"
+ " RX offset=%u bytes.\n"
+ "\t\tCurrently you just have %u bytes available"
+ " but the received packet is %u bytes long",
+ hw->rx_offset,
+ rxq->mbuf_size - hw->rx_offset,
+ mb->data_len);
+ return -EINVAL;
+ }
+
+ /* Filling the received mbuff with packet info */
+ if (hw->rx_offset)
+ mb->data_off = RTE_PKTMBUF_HEADROOM + hw->rx_offset;
+ else
+ mb->data_off = RTE_PKTMBUF_HEADROOM +
+ NFP_DESC_META_LEN(rxds);
+
+ /* No scatter mode supported */
+ mb->nb_segs = 1;
+ mb->next = NULL;
+
+ /* Checking the RSS flag */
+ nfp_net_set_hash(rxq, rxds, mb);
+
+ /* Checking the checksum flag */
+ nfp_net_rx_cksum(rxq, rxds, mb);
+
+ /* Checking the port flag */
+ nfp_net_check_port(rxds, mb);
+
+ if ((rxds->rxd.flags & PCIE_DESC_RX_VLAN) &&
+ (hw->ctrl & NFP_NET_CFG_CTRL_RXVLAN)) {
+ mb->vlan_tci = rte_cpu_to_le_32(rxds->rxd.vlan);
+ mb->ol_flags |= PKT_RX_VLAN_PKT;
+ }
+
+ /* Adding the mbuff to the mbuff array passed by the app */
+ rx_pkts[avail++] = mb;
+
+ /* Now resetting and updating the descriptor */
+ rxds->vals[0] = 0;
+ rxds->vals[1] = 0;
+ dma_addr = rte_cpu_to_le_64(RTE_MBUF_DMA_ADDR_DEFAULT(new_mb));
+ rxds->fld.dd = 0;
+ rxds->fld.dma_addr_hi = (dma_addr >> 32) & 0xff;
+ rxds->fld.dma_addr_lo = dma_addr & 0xffffffff;
+
+ rxq->rd_p++;
+ }
+
+ if (nb_hold == 0)
+ return nb_hold;
+
+ PMD_RX_LOG(DEBUG, "RX port_id=%u queue_id=%u, %d packets received\n",
+ (unsigned)rxq->port_id, (unsigned)rxq->qidx, nb_hold);
+
+ nb_hold += rxq->nb_rx_hold;
+
+ /*
+ * FL descriptors needs to be written before incrementing the
+ * FL queue WR pointer
+ */
+ rte_wmb();
+ if (nb_hold > rxq->rx_free_thresh) {
+ PMD_RX_LOG(DEBUG, "port=%u queue=%u nb_hold=%u avail=%u\n",
+ (unsigned)rxq->port_id, (unsigned)rxq->qidx,
+ (unsigned)nb_hold, (unsigned)avail);
+ nfp_qcp_ptr_add(rxq->qcp_fl, NFP_QCP_WRITE_PTR, nb_hold);
+ nb_hold = 0;
+ }
+ rxq->nb_rx_hold = nb_hold;
+
+ return avail;
+}
+
+/*
+ * nfp_net_tx_free_bufs - Check for descriptors with a complete
+ * status
+ * @txq: TX queue to work with
+ * Returns number of descriptors freed
+ */
+int
+nfp_net_tx_free_bufs(struct nfp_net_txq *txq)
+{
+ uint32_t qcp_rd_p;
+ int todo;
+
+ PMD_TX_LOG(DEBUG, "queue %u. Check for descriptor with a complete"
+ " status\n", txq->qidx);
+
+ /* Work out how many packets have been sent */
+ qcp_rd_p = nfp_qcp_read(txq->qcp_q, NFP_QCP_READ_PTR);
+
+ if (qcp_rd_p == txq->qcp_rd_p) {
+ PMD_TX_LOG(DEBUG, "queue %u: It seems harrier is not sending "
+ "packets (%u, %u)\n", txq->qidx,
+ qcp_rd_p, txq->qcp_rd_p);
+ return 0;
+ }
+
+ if (qcp_rd_p > txq->qcp_rd_p)
+ todo = qcp_rd_p - txq->qcp_rd_p;
+ else
+ todo = qcp_rd_p + txq->tx_count - txq->qcp_rd_p;
+
+ PMD_TX_LOG(DEBUG, "qcp_rd_p %u, txq->qcp_rd_p: %u, qcp->rd_p: %u\n",
+ qcp_rd_p, txq->qcp_rd_p, txq->rd_p);
+
+ if (todo == 0)
+ return todo;
+
+ txq->qcp_rd_p += todo;
+ txq->qcp_rd_p %= txq->tx_count;
+ txq->rd_p += todo;
+
+ return todo;
+}
+
+/* Leaving always free descriptors for avoiding wrapping confusion */
+#define NFP_FREE_TX_DESC(t) (t->tx_count - (t->wr_p - t->rd_p) - 8)
+
+/*
+ * nfp_net_txq_full - Check if the TX queue free descriptors
+ * is below tx_free_threshold
+ *
+ * @txq: TX queue to check
+ *
+ * This function uses the host copy* of read/write pointers
+ */
+static inline
+int nfp_net_txq_full(struct nfp_net_txq *txq)
+{
+ return NFP_FREE_TX_DESC(txq) < txq->tx_free_thresh;
+}
+
+static uint16_t
+nfp_net_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
+{
+ struct nfp_net_txq *txq;
+ struct nfp_net_hw *hw;
+ struct nfp_net_tx_desc *txds;
+ struct rte_mbuf *pkt;
+ uint64_t dma_addr;
+ int pkt_size, dma_size;
+ uint16_t free_descs, issued_descs;
+ struct rte_mbuf **lmbuf;
+ int i;
+
+ txq = tx_queue;
+ hw = txq->hw;
+ txds = &txq->txds[txq->tail];
+
+ PMD_TX_LOG(DEBUG, "working for queue %u at pos %d and %u packets\n",
+ txq->qidx, txq->tail, nb_pkts);
+
+ if ((NFP_FREE_TX_DESC(txq) < nb_pkts) || (nfp_net_txq_full(txq)))
+ nfp_net_tx_free_bufs(txq);
+
+ free_descs = (uint16_t)NFP_FREE_TX_DESC(txq);
+ if (unlikely(free_descs == 0))
+ return 0;
+
+ pkt = *tx_pkts;
+
+ i = 0;
+ issued_descs = 0;
+ PMD_TX_LOG(DEBUG, "queue: %u. Sending %u packets\n",
+ txq->qidx, nb_pkts);
+ /* Sending packets */
+ while ((i < nb_pkts) && free_descs) {
+ /* Grabbing the mbuf linked to the current descriptor */
+ lmbuf = &txq->txbufs[txq->tail].mbuf;
+ /* Warming the cache for releasing the mbuf later on */
+ RTE_MBUF_PREFETCH_TO_FREE(*lmbuf);
+
+ pkt = *(tx_pkts + i);
+
+ if (unlikely((pkt->nb_segs > 1) &&
+ !(hw->cap & NFP_NET_CFG_CTRL_GATHER))) {
+ PMD_INIT_LOG(INFO, "NFP_NET_CFG_CTRL_GATHER not set\n");
+ rte_panic("Multisegment packet unsupported\n");
+ }
+
+ /* Checking if we have enough descriptors */
+ if (unlikely(pkt->nb_segs > free_descs))
+ goto xmit_end;
+
+ /*
+ * Checksum and VLAN flags just in the first descriptor for a
+ * multisegment packet
+ */
+ nfp_net_tx_cksum(txq, txds, pkt);
+
+ if ((pkt->ol_flags & PKT_TX_VLAN_PKT) &&
+ (hw->cap & NFP_NET_CFG_CTRL_TXVLAN)) {
+ txds->flags |= PCIE_DESC_TX_VLAN;
+ txds->vlan = pkt->vlan_tci;
+ }
+
+ if (pkt->ol_flags & PKT_TX_TCP_SEG)
+ rte_panic("TSO is not supported\n");
+
+ /*
+ * mbuf data_len is the data in one segment and pkt_len data
+ * in the whole packet. When the packet is just one segment,
+ * then data_len = pkt_len
+ */
+ pkt_size = pkt->pkt_len;
+
+ while (pkt_size) {
+ /* Releasing mbuf which was prefetched above */
+ if (*lmbuf)
+ rte_pktmbuf_free_seg(*lmbuf);
+
+ dma_size = pkt->data_len;
+ dma_addr = RTE_MBUF_DATA_DMA_ADDR(pkt);
+ PMD_TX_LOG(DEBUG, "Working with mbuf at dma address:"
+ "%" PRIx64 "\n", dma_addr);
+
+ /* Filling descriptors fields */
+ txds->dma_len = dma_size;
+ txds->data_len = pkt->pkt_len;
+ txds->dma_addr_hi = (dma_addr >> 32) & 0xff;
+ txds->dma_addr_lo = (dma_addr & 0xffffffff);
+ ASSERT(free_descs > 0);
+ free_descs--;
+
+ /*
+ * Linking mbuf with descriptor for being released
+ * next time descriptor is used
+ */
+ *lmbuf = pkt;
+
+ txq->wr_p++;
+ txq->tail++;
+ if (unlikely(txq->tail == txq->tx_count)) /* wrapping?*/
+ txq->tail = 0;
+
+ pkt_size -= dma_size;
+ if (!pkt_size) {
+ /* End of packet */
+ txds->offset_eop |= PCIE_DESC_TX_EOP;
+ } else {
+ txds->offset_eop &= PCIE_DESC_TX_OFFSET_MASK;
+ pkt = pkt->next;
+ }
+ /* Referencing next free TX descriptor */
+ txds = &txq->txds[txq->tail];
+ issued_descs++;
+ }
+ i++;
+ }
+
+xmit_end:
+ /* Increment write pointers. Force memory write before we let HW know */
+ rte_wmb();
+ nfp_qcp_ptr_add(txq->qcp_q, NFP_QCP_WRITE_PTR, issued_descs);
+
+ return i;
+}
+
/* Initialise and register driver with DPDK Application */
static struct eth_dev_ops nfp_net_eth_dev_ops = {
.dev_configure = nfp_net_configure,
.dev_start = nfp_net_start,
.dev_stop = nfp_net_stop,
.dev_close = nfp_net_close,
+ .rx_queue_setup = nfp_net_rx_queue_setup,
+ .rx_queue_release = nfp_net_rx_queue_release,
+ .rx_queue_count = nfp_net_rx_queue_count,
+ .tx_queue_setup = nfp_net_tx_queue_setup,
+ .tx_queue_release = nfp_net_tx_queue_release,
};
static int
@@ -538,6 +1529,8 @@ nfp_net_init(struct rte_eth_dev *eth_dev)
hw = NFP_NET_DEV_PRIVATE_TO_HW(eth_dev->data->dev_private);
eth_dev->dev_ops = &nfp_net_eth_dev_ops;
+ eth_dev->rx_pkt_burst = &nfp_net_recv_pkts;
+ eth_dev->tx_pkt_burst = &nfp_net_xmit_pkts;
/* For secondary processes, the primary has done all the work */
if (rte_eal_process_type() != RTE_PROC_PRIMARY)
--
1.7.9.5
