[5/6] net/enic: generate VXLAN source port if it is zero in template
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Message ID 20200909140006.23788-6-hyonkim@cisco.com
State Accepted
Delegated to: Ferruh Yigit
Headers show
Series
  • net/enic: minor updates to flow implementation
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Context Check Description
ci/checkpatch success coding style OK

Commit Message

Hyong Youb Kim (hyonkim) Sept. 9, 2020, 2 p.m. UTC
When VXLAN source port in the template is zero, the adapter is
expected to generate a value based on the inner packet flow, when it
performs encapsulation. Flow Manager in the VIC adapter currently
lacks such ability. So, generate a random port when creating a flow if
the port is zero, to avoid transmitting packets with source port 0.

Fixes: ea7768b5bba8 ("net/enic: add flow implementation based on Flow Manager API")
Cc: stable@dpdk.org

Signed-off-by: Hyong Youb Kim <hyonkim@cisco.com>
Reviewed-by: John Daley <johndale@cisco.com>
---
 drivers/net/enic/enic_fm_flow.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

Patch
diff mbox series

diff --git a/drivers/net/enic/enic_fm_flow.c b/drivers/net/enic/enic_fm_flow.c
index a350b29a3..7eec8e6eb 100644
--- a/drivers/net/enic/enic_fm_flow.c
+++ b/drivers/net/enic/enic_fm_flow.c
@@ -978,6 +978,17 @@  enic_fm_copy_vxlan_decap(struct enic_flowman *fm,
 	return enic_fm_append_action_op(fm, &fm_op, error);
 }
 
+/* Generate a reasonable source port number */
+static uint16_t
+gen_src_port(void)
+{
+	/* Min/max below are the default values in OVS-DPDK and Linux */
+	uint16_t p = rte_rand();
+	p = RTE_MAX(p, 32768);
+	p = RTE_MIN(p, 61000);
+	return rte_cpu_to_be_16(p);
+}
+
 /* VXLAN encap is done via flowman compound action */
 static int
 enic_fm_copy_vxlan_encap(struct enic_flowman *fm,
@@ -986,6 +997,7 @@  enic_fm_copy_vxlan_encap(struct enic_flowman *fm,
 {
 	struct fm_action_op fm_op;
 	struct rte_ether_hdr *eth;
+	struct rte_udp_hdr *udp;
 	uint16_t *ethertype;
 	void *template;
 	uint8_t off;
@@ -1084,8 +1096,17 @@  enic_fm_copy_vxlan_encap(struct enic_flowman *fm,
 		off + offsetof(struct rte_udp_hdr, dgram_len);
 	fm_op.encap.len2_delta =
 		sizeof(struct rte_udp_hdr) + sizeof(struct rte_vxlan_hdr);
+	udp = (struct rte_udp_hdr *)template;
 	append_template(&template, &off, item->spec,
 			sizeof(struct rte_udp_hdr));
+	/*
+	 * Firmware does not hash/fill source port yet. Generate a
+	 * random port, as there is *usually* one rte_flow for the
+	 * given inner packet stream (i.e. a single stream has one
+	 * random port).
+	 */
+	if (udp->src_port == 0)
+		udp->src_port = gen_src_port();
 	item++;
 	flow_item_skip_void(&item);