From e3f0151fc6c56b58cefa3e5fd04209292ed6400c Mon Sep 17 00:00:00 2001 From: Olivier Matz Date: Fri, 13 Feb 2015 10:22:34 +0100 Subject: [PATCH] i40e: enable Tx checksum only for offloaded packets From i40e datasheet: The IP header type and its offload. In case of tunneling, the IIPT relates to the inner IP header. See also EIPT field for the outer (External) IP header offload. 00 - non IP packet or packet type is not defined by software 01 - IPv6 packet 10 - IPv4 packet with no IP checksum offload 11 - IPv4 packet with IP checksum offload Therefore it is not needed to fill the IIPT field if no offload is requested (we can keep the value to 00). For instance, the linux driver code does not set it when (skb->ip_summed != CHECKSUM_PARTIAL). We can do the same in the dpdk driver. The function i40e_txd_enable_checksum() that fills the offload registers can only be called for packets requiring an offload. Signed-off-by: Olivier Matz Acked-by: Jijiang Liu --- lib/librte_pmd_i40e/i40e_rxtx.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/lib/librte_pmd_i40e/i40e_rxtx.c b/lib/librte_pmd_i40e/i40e_rxtx.c index 8e9df967a4..b46746169a 100644 --- a/lib/librte_pmd_i40e/i40e_rxtx.c +++ b/lib/librte_pmd_i40e/i40e_rxtx.c @@ -74,6 +74,11 @@ #define I40E_TXD_CMD (I40E_TX_DESC_CMD_EOP | I40E_TX_DESC_CMD_RS) +#define I40E_TX_CKSUM_OFFLOAD_MASK ( \ + PKT_TX_IP_CKSUM | \ + PKT_TX_L4_MASK | \ + PKT_TX_OUTER_IP_CKSUM) + #define RTE_MBUF_DATA_DMA_ADDR_DEFAULT(mb) \ (uint64_t) ((mb)->buf_physaddr + RTE_PKTMBUF_HEADROOM) @@ -1272,10 +1277,12 @@ i40e_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) /* Enable checksum offloading */ cd_tunneling_params = 0; - i40e_txd_enable_checksum(ol_flags, &td_cmd, &td_offset, - l2_len, l3_len, outer_l2_len, - outer_l3_len, - &cd_tunneling_params); + if (unlikely(ol_flags & I40E_TX_CKSUM_OFFLOAD_MASK)) { + i40e_txd_enable_checksum(ol_flags, &td_cmd, &td_offset, + l2_len, l3_len, outer_l2_len, + outer_l3_len, + &cd_tunneling_params); + } if (unlikely(nb_ctx)) { /* Setup TX context descriptor if required */ -- 2.20.1