Dpdk: Add DPDK mbuf alignment to max_packet_size calculation

Pavel Siska · Pavel Siska · commit 54d599d0e977 · 2025-05-07T12:04:58.000+02:00
diff --git a/src/plugins/input/dpdk/src/dpdkDevice.cpp b/src/plugins/input/dpdk/src/dpdkDevice.cpp
@@ -168,7 +168,9 @@ void DpdkDevice::initMemPools(uint16_t memPoolSize)
 {
 	constexpr int MEMPOOL_CACHE_SIZE = 256;
 	constexpr int VLAN_HDR_LEN = 4;
-	const int max_packet_size = m_mtuSize + RTE_ETHER_HDR_LEN + VLAN_HDR_LEN;
+	constexpr int DPDK_MBUF_ALIGN = 1024;
+	const int max_packet_size
+		= RTE_ALIGN_CEIL(m_mtuSize + RTE_ETHER_HDR_LEN + VLAN_HDR_LEN, DPDK_MBUF_ALIGN);
 
 	m_memPools.reserve(m_rxQueueCount);
 

Original file line number	Diff line number	Diff line change
`@@ -168,7 +168,9 @@ void DpdkDevice::initMemPools(uint16_t memPoolSize)`
`168`	`168`	`{`
`169`	`169`	`constexpr int MEMPOOL_CACHE_SIZE = 256;`
`170`	`170`	`constexpr int VLAN_HDR_LEN = 4;`
`171`		`- const int max_packet_size = m_mtuSize + RTE_ETHER_HDR_LEN + VLAN_HDR_LEN;`
	`171`	`+ constexpr int DPDK_MBUF_ALIGN = 1024;`
	`172`	`+ const int max_packet_size`
	`173`	`+ = RTE_ALIGN_CEIL(m_mtuSize + RTE_ETHER_HDR_LEN + VLAN_HDR_LEN, DPDK_MBUF_ALIGN);`
`172`	`174`
`173`	`175`	`m_memPools.reserve(m_rxQueueCount);`
`174`	`176`