net/sfc: remove Tx DMA descriptor boundary crossing limit

[dpdk.git] / drivers / net / sfc / sfc_tx.c

diff --git a/drivers/net/sfc/sfc_tx.c b/drivers/net/sfc/sfc_tx.c
index e772584..5bb31ad 100644 (file)
--- a/drivers/net/sfc/sfc_tx.c
+++ b/drivers/net/sfc/sfc_tx.c
@@ -137,6 +137,7 @@ sfc_tx_qinit(struct sfc_adapter *sa, unsigned int sw_index,
             uint16_t nb_tx_desc, unsigned int socket_id,
             const struct rte_eth_txconf *tx_conf)
 {
+       const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
        struct sfc_txq_info *txq_info;
        struct sfc_evq *evq;
        struct sfc_txq *txq;
@@ -195,6 +196,7 @@ sfc_tx_qinit(struct sfc_adapter *sa, unsigned int sw_index,
        txq->ptr_mask = txq_info->entries - 1;
        txq->free_thresh = (tx_conf->tx_free_thresh) ? tx_conf->tx_free_thresh :
                                                     SFC_TX_DEFAULT_FREE_THRESH;
+       txq->dma_desc_size_max = encp->enc_tx_dma_desc_size_max;
        txq->hw_index = sw_index;
        txq->flags = tx_conf->txq_flags;
        txq->evq = evq;
@@ -302,21 +304,27 @@ sfc_tx_check_mode(struct sfc_adapter *sa, const struct rte_eth_txmode *txmode)
 int
 sfc_tx_init(struct sfc_adapter *sa)
 {
+       const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
        const struct rte_eth_conf *dev_conf = &sa->eth_dev->data->dev_conf;
        unsigned int sw_index;
        int rc = 0;
 
+       /*
+        * The datapath implementation assumes absence of boundary
+        * limits on Tx DMA descriptors. Addition of these checks on
+        * datapath would simply make the datapath slower.
+        */
+       if (encp->enc_tx_dma_desc_boundary != 0) {
+               rc = ENOTSUP;
+               goto fail_tx_dma_desc_boundary;
+       }
+
        rc = sfc_tx_check_mode(sa, &dev_conf->txmode);
        if (rc != 0)
                goto fail_check_mode;
 
        sa->txq_count = sa->eth_dev->data->nb_tx_queues;
 
-       if (sa->tso)
-               sa->txq_count = MIN(sa->txq_count,
-                  efx_nic_cfg_get(sa->nic)->enc_fw_assisted_tso_v2_n_contexts /
-                  efx_nic_cfg_get(sa->nic)->enc_hw_pf_count);
-
        sa->txq_info = rte_calloc_socket("sfc-txqs", sa->txq_count,
                                         sizeof(sa->txq_info[0]), 0,
                                         sa->socket_id);
@@ -339,6 +347,7 @@ fail_txqs_alloc:
        sa->txq_count = 0;
 
 fail_check_mode:
+fail_tx_dma_desc_boundary:
        sfc_log_init(sa, "failed (rc = %d)", rc);
        return rc;
 }
@@ -709,9 +718,13 @@ sfc_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
                                efsys_dma_addr_t        frag_addr = next_frag;
                                size_t                  frag_len;
 
-                               next_frag = RTE_ALIGN(frag_addr + 1,
-                                                     SFC_TX_SEG_BOUNDARY);
-                               frag_len = MIN(next_frag - frag_addr, seg_len);
+                               /*
+                                * It is assumed here that there is no
+                                * limitation on address boundary
+                                * crossing by DMA descriptor.
+                                */
+                               frag_len = MIN(seg_len, txq->dma_desc_size_max);
+                               next_frag += frag_len;
                                seg_len -= frag_len;
                                pkt_len -= frag_len;