Re: [dpdk-dev] [PATCH 6/7] vmxnet3: support RSS and refactor offload

[Yong Wang <yongwang@vmware.com>]

On 12/16/14, 9:13 PM, "Stephen Hemminger" <stephen@networkplumber.org>
wrote:

>From: Stephen Hemminger <shemming@brocade.com>
>
>Refactor the logic to compute receive offload flags to a simpler
>function. Andd add support for putting RSS flow hash into packet.
>
>Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
>Signed-off-by: Bill Hong <bhong@brocade.com>
>---

Acked-by: Yong Wang <yongwang@vmware.com>

> lib/librte_pmd_vmxnet3/vmxnet3_rxtx.c | 69
>++++++++++++++++++++---------------
> 1 file changed, 40 insertions(+), 29 deletions(-)
>
>diff --git a/lib/librte_pmd_vmxnet3/vmxnet3_rxtx.c
>b/lib/librte_pmd_vmxnet3/vmxnet3_rxtx.c
>index bd47c6c..53ddb2c 100644
>--- a/lib/librte_pmd_vmxnet3/vmxnet3_rxtx.c
>+++ b/lib/librte_pmd_vmxnet3/vmxnet3_rxtx.c
>@@ -488,6 +488,43 @@ vmxnet3_post_rx_bufs(vmxnet3_rx_queue_t *rxq,
>uint8_t ring_id)
> 		return i;
> }
> 
>+
>+/* Receive side checksum and other offloads */
>+static void
>+vmxnet3_rx_offload(const Vmxnet3_RxCompDesc *rcd, struct rte_mbuf *rxm)
>+{
>+	/* Check for hardware stripped VLAN tag */
>+	if (rcd->ts) {
>+		rxm->ol_flags |= PKT_RX_VLAN_PKT;
>+		rxm->vlan_tci = rte_le_to_cpu_16((uint16_t)rcd->tci);
>+	}
>+
>+	/* Check for RSS */
>+	if (rcd->rssType != VMXNET3_RCD_RSS_TYPE_NONE) {
>+		rxm->ol_flags |= PKT_RX_RSS_HASH;
>+		rxm->hash.rss = rcd->rssHash;
>+	}
>+
>+	/* Check packet type, checksum errors, etc. Only support IPv4 for now.
>*/
>+	if (rcd->v4) {
>+		struct ether_hdr *eth = rte_pktmbuf_mtod(rxm, struct ether_hdr *);
>+		struct ipv4_hdr *ip = (struct ipv4_hdr *)(eth + 1);
>+
>+		if (((ip->version_ihl & 0xf) << 2) > (int)sizeof(struct ipv4_hdr))
>+			rxm->ol_flags |= PKT_RX_IPV4_HDR_EXT;
>+		else
>+			rxm->ol_flags |= PKT_RX_IPV4_HDR;
>+
>+		if (!rcd->cnc) {
>+			if (!rcd->ipc)
>+				rxm->ol_flags |= PKT_RX_IP_CKSUM_BAD;
>+
>+			if ((rcd->tcp || rcd->udp) && !rcd->tuc)
>+				rxm->ol_flags |= PKT_RX_L4_CKSUM_BAD;
>+		}
>+	}
>+}
>+
> /*
>  * Process the Rx Completion Ring of given vmxnet3_rx_queue
>  * for nb_pkts burst and return the number of packets received
>@@ -583,17 +620,6 @@ vmxnet3_recv_pkts(void *rx_queue, struct rte_mbuf
>**rx_pkts, uint16_t nb_pkts)
> 			goto rcd_done;
> 		}
> 
>-		/* Check for hardware stripped VLAN tag */
>-		if (rcd->ts) {
>-			PMD_RX_LOG(DEBUG, "Received packet with vlan ID: %d.",
>-				   rcd->tci);
>-			rxm->ol_flags = PKT_RX_VLAN_PKT;
>-			/* Copy vlan tag in packet buffer */
>-			rxm->vlan_tci = rte_le_to_cpu_16((uint16_t)rcd->tci);
>-		} else {
>-			rxm->ol_flags = 0;
>-			rxm->vlan_tci = 0;
>-		}
> 
> 		/* Initialize newly received packet buffer */
> 		rxm->port = rxq->port_id;
>@@ -602,25 +628,10 @@ vmxnet3_recv_pkts(void *rx_queue, struct rte_mbuf
>**rx_pkts, uint16_t nb_pkts)
> 		rxm->pkt_len = (uint16_t)rcd->len;
> 		rxm->data_len = (uint16_t)rcd->len;
> 		rxm->data_off = RTE_PKTMBUF_HEADROOM;
>+		rxm->ol_flags = 0;
>+		rxm->vlan_tci = 0;
> 
>-		/* Check packet type, checksum errors, etc. Only support IPv4 for now.
>*/
>-		if (rcd->v4) {
>-			struct ether_hdr *eth = rte_pktmbuf_mtod(rxm, struct ether_hdr *);
>-			struct ipv4_hdr *ip = (struct ipv4_hdr *)(eth + 1);
>-
>-			if (((ip->version_ihl & 0xf) << 2) > (int)sizeof(struct ipv4_hdr))
>-				rxm->ol_flags |= PKT_RX_IPV4_HDR_EXT;
>-			else
>-				rxm->ol_flags |= PKT_RX_IPV4_HDR;
>-
>-			if (!rcd->cnc) {
>-				if (!rcd->ipc)
>-					rxm->ol_flags |= PKT_RX_IP_CKSUM_BAD;
>-
>-				if ((rcd->tcp || rcd->udp) && !rcd->tuc)
>-					rxm->ol_flags |= PKT_RX_L4_CKSUM_BAD;
>-			}
>-		}
>+		vmxnet3_rx_offload(rcd, rxm);
> 
> 		rx_pkts[nb_rx++] = rxm;
> rcd_done:
>-- 
>2.1.3
>