[dpdk-dev] [PATCH] net/thunderx: fix MTU configuration for jumbo pkts
Jerin Jacob
jerin.jacob at caviumnetworks.com
Wed Apr 18 06:56:54 CEST 2018
-----Original Message-----
> Date: Mon, 16 Apr 2018 10:44:47 +0000
> From: Nitin Saxena <nitin.saxena at caviumnetworks.com>
> To: Jerin Jacob <jerin.jacob at caviumnetworks.com>
> Cc: Nitin Saxena <nitin.saxena at caviumnetworks.com>, Narayana Prasad
> <narayanaprasad.athreya at caviumnetworks.com>, dev at dpdk.org
> Subject: [PATCH] net/thunderx: fix MTU configuration for jumbo pkts
> X-Mailer: git-send-email 2.7.4
>
> thunderx pmd driver passes dev_info.max_rx_pktlen as
> 9200 (via rte_eth_dev_info_get()) to application.
> But, when application tries to set MTU as
> (9200 - sizeof(ethernet_header_t)) the operation fails
> because of missing CRC and VLAN additions.
>
> This patch fixes the following for thunderx pmd driver:
> - Sets NIC_HW_MAX_FRS to 9216 (instead of 9200)
> - Sets NIC_HW_MAX_MTU to 9190 (NIC_HW_MAX_FRS - ETH_HLEN
> - ETHER_CRC_LEN - 2*VLAN_HLEN)
> - Sets dev_info->max_rx_pkt_len to NIC_HW_MAX_MTU +
> ETH_HLEN (instead of 9200)
> - Allows rte_eth_dev_set_mtu() to pass if application
> (like VPP) calls rte_eth_dev_set_mtu() before
> rte_eth_dev_start() by putting appropriate check for
> dev->data->dev_started
>
> Fixes: 65d9804edc05 ("net/thunderx: support MTU configuration")
>
Cc: stable at dpdk.org
> Signed-off-by: Nitin Saxena <nitin.saxena at caviumnetworks.com>
Acked-by: Jerin Jacob <jerin.jacob at caviumnetworks.com>
> ---
> drivers/net/thunderx/base/nicvf_hw_defs.h | 5 ++++-
> drivers/net/thunderx/nicvf_ethdev.c | 15 +++++++--------
> 2 files changed, 11 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/net/thunderx/base/nicvf_hw_defs.h b/drivers/net/thunderx/base/nicvf_hw_defs.h
> index b13c21f..b12c8ec 100644
> --- a/drivers/net/thunderx/base/nicvf_hw_defs.h
> +++ b/drivers/net/thunderx/base/nicvf_hw_defs.h
> @@ -171,7 +171,10 @@
>
> /* Min/Max packet size */
> #define NIC_HW_MIN_FRS (64)
> -#define NIC_HW_MAX_FRS (9200) /* 9216 max pkt including FCS */
> +/* ETH_HLEN+ETH_FCS_LEN+2*VLAN_HLEN */
> +#define NIC_HW_L2_OVERHEAD (26)
> +#define NIC_HW_MAX_MTU (9190)
> +#define NIC_HW_MAX_FRS (NIC_HW_MAX_MTU + NIC_HW_L2_OVERHEAD)
> #define NIC_HW_MAX_SEGS (12)
>
> /* Descriptor alignments */
> diff --git a/drivers/net/thunderx/nicvf_ethdev.c b/drivers/net/thunderx/nicvf_ethdev.c
> index 75e9d16..a7931af 100644
> --- a/drivers/net/thunderx/nicvf_ethdev.c
> +++ b/drivers/net/thunderx/nicvf_ethdev.c
> @@ -162,7 +162,7 @@ static int
> nicvf_dev_set_mtu(struct rte_eth_dev *dev, uint16_t mtu)
> {
> struct nicvf *nic = nicvf_pmd_priv(dev);
> - uint32_t buffsz, frame_size = mtu + ETHER_HDR_LEN + ETHER_CRC_LEN;
> + uint32_t buffsz, frame_size = mtu + NIC_HW_L2_OVERHEAD;
> size_t i;
> struct rte_eth_rxmode *rxmode = &dev->data->dev_conf.rxmode;
>
> @@ -180,7 +180,7 @@ nicvf_dev_set_mtu(struct rte_eth_dev *dev, uint16_t mtu)
> * Refuse mtu that requires the support of scattered packets
> * when this feature has not been enabled before.
> */
> - if (!dev->data->scattered_rx &&
> + if (dev->data->dev_started && !dev->data->scattered_rx &&
> (frame_size + 2 * VLAN_TAG_SIZE > buffsz))
> return -EINVAL;
>
> @@ -194,11 +194,11 @@ nicvf_dev_set_mtu(struct rte_eth_dev *dev, uint16_t mtu)
> else
> rxmode->offloads &= ~DEV_RX_OFFLOAD_JUMBO_FRAME;
>
> - if (nicvf_mbox_update_hw_max_frs(nic, frame_size))
> + if (nicvf_mbox_update_hw_max_frs(nic, mtu))
> return -EINVAL;
>
> - /* Update max frame size */
> - rxmode->max_rx_pkt_len = (uint32_t)frame_size;
> + /* Update max_rx_pkt_len */
> + rxmode->max_rx_pkt_len = mtu + ETHER_HDR_LEN;
> nic->mtu = mtu;
>
> for (i = 0; i < nic->sqs_count; i++)
> @@ -1408,7 +1408,7 @@ nicvf_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
> dev_info->speed_capa |= ETH_LINK_SPEED_40G;
>
> dev_info->min_rx_bufsize = ETHER_MIN_MTU;
> - dev_info->max_rx_pktlen = NIC_HW_MAX_FRS;
> + dev_info->max_rx_pktlen = NIC_HW_MAX_MTU + ETHER_HDR_LEN;
> dev_info->max_rx_queues =
> (uint16_t)MAX_RCV_QUEUES_PER_QS * (MAX_SQS_PER_VF + 1);
> dev_info->max_tx_queues =
> @@ -1741,8 +1741,7 @@ nicvf_dev_start(struct rte_eth_dev *dev)
> /* Setup MTU based on max_rx_pkt_len or default */
> mtu = dev->data->dev_conf.rxmode.offloads & DEV_RX_OFFLOAD_JUMBO_FRAME ?
> dev->data->dev_conf.rxmode.max_rx_pkt_len
> - - ETHER_HDR_LEN - ETHER_CRC_LEN
> - : ETHER_MTU;
> + - ETHER_HDR_LEN : ETHER_MTU;
>
> if (nicvf_dev_set_mtu(dev, mtu)) {
> PMD_INIT_LOG(ERR, "Failed to set default mtu size");
> --
> 2.7.4
>
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