net/sfc: support Tx preparation in EFX datapath

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

diff --git a/drivers/net/sfc/sfc_tso.c b/drivers/net/sfc/sfc_tso.c
index 1ce787f..2c03c08 100644 (file)
--- a/drivers/net/sfc/sfc_tso.c
+++ b/drivers/net/sfc/sfc_tso.c
@@ -97,7 +97,7 @@ sfc_efx_tso_do(struct sfc_efx_txq *txq, unsigned int idx,
        uint8_t *tsoh;
        const struct tcp_hdr *th;
        efsys_dma_addr_t header_paddr;
-       uint16_t packet_id;
+       uint16_t packet_id = 0;
        uint32_t sent_seq;
        struct rte_mbuf *m = *in_seg;
        size_t nh_off = m->l2_len; /* IP header offset */
@@ -147,17 +147,18 @@ sfc_efx_tso_do(struct sfc_efx_txq *txq, unsigned int idx,
                tsoh = rte_pktmbuf_mtod(m, uint8_t *);
        }
 
-       /* Handle IP header */
+       /*
+        * Handle IP header. Tx prepare has debug-only checks that offload flags
+        * are correctly filled in in TSO mbuf. Use zero IPID if there is no
+        * IPv4 flag. If the packet is still IPv4, HW will simply start from
+        * zero IPID.
+        */
        if (m->ol_flags & PKT_TX_IPV4) {
                const struct ipv4_hdr *iphe4;
 
                iphe4 = (const struct ipv4_hdr *)(tsoh + nh_off);
                rte_memcpy(&packet_id, &iphe4->packet_id, sizeof(uint16_t));
                packet_id = rte_be_to_cpu_16(packet_id);
-       } else if (m->ol_flags & PKT_TX_IPV6) {
-               packet_id = 0;
-       } else {
-               return EINVAL;
        }
 
        /* Handle TCP header */