Add the background for this patch.
https://mails.dpdk.org/archives/dev/2018-November/117771.html
https://mails.dpdk.org/archives/dev/2018-November/117772.html
> -----Original Message-----
> From: Zhao1, Wei
> Sent: Thursday, November 1, 2018 4:29 PM
> To: Zhao1, Wei <wei.zh...@intel.com>; dev@dpdk.org
> Cc: sta...@dpdk.org; Zhang, Qi Z <qi.z.zh...@intel.com>;
> yamashita.hidey...@po.ntt-tx.co.jp; step...@networkplumber.org
> Subject: [PATCH v2] net/ixgbe: check jumbo frame enable parameter
>
> There is necessary to do some check of max packet size boundary for code
> safe in order to avoid error in register setting when enable jumbo.
>
> Signed-off-by: Wei Zhao <wei.zh...@intel.com>
>
> ---
>
> v2:
> -add more log infomation and fix build issue
> ---
> drivers/net/ixgbe/ixgbe_ethdev.c | 4 +---
> drivers/net/ixgbe/ixgbe_ethdev.h | 2 ++
> drivers/net/ixgbe/ixgbe_rxtx.c | 31
> +++++++++++++++++++++++++++++++
> 3 files changed, 34 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c
> b/drivers/net/ixgbe/ixgbe_ethdev.c
> index 5a2c351..d65a911 100644
> --- a/drivers/net/ixgbe/ixgbe_ethdev.c
> +++ b/drivers/net/ixgbe/ixgbe_ethdev.c
> @@ -173,8 +173,6 @@ static int
> ixgbe_dev_queue_stats_mapping_set(struct rte_eth_dev *eth_dev,
> uint8_t is_rx);
> static int ixgbe_fw_version_get(struct rte_eth_dev *dev, char *fw_version,
> size_t fw_size);
> -static void ixgbe_dev_info_get(struct rte_eth_dev *dev,
> - struct rte_eth_dev_info *dev_info);
> static const uint32_t *ixgbe_dev_supported_ptypes_get(struct
> rte_eth_dev *dev); static void ixgbevf_dev_info_get(struct rte_eth_dev
> *dev,
> struct rte_eth_dev_info *dev_info); @@ -
> 3692,7 +3690,7 @@ static int ixgbevf_dev_xstats_get_names(__rte_unused
> struct rte_eth_dev *dev,
> return 0;
> }
>
> -static void
> +void
> ixgbe_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info
> *dev_info) {
> struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(dev); diff --
> git a/drivers/net/ixgbe/ixgbe_ethdev.h b/drivers/net/ixgbe/ixgbe_ethdev.h
> index d0b9396..a474be4 100644
> --- a/drivers/net/ixgbe/ixgbe_ethdev.h
> +++ b/drivers/net/ixgbe/ixgbe_ethdev.h
> @@ -727,6 +727,8 @@ int ixgbe_action_rss_same(const struct
> rte_flow_action_rss *comp,
> const struct rte_flow_action_rss *with); int
> ixgbe_config_rss_filter(struct rte_eth_dev *dev,
> struct ixgbe_rte_flow_rss_conf *conf, bool add);
> +void ixgbe_dev_info_get(struct rte_eth_dev *dev,
> + struct rte_eth_dev_info *dev_info);
>
> static inline int
> ixgbe_ethertype_filter_lookup(struct ixgbe_filter_info *filter_info, diff
> --git
> a/drivers/net/ixgbe/ixgbe_rxtx.c b/drivers/net/ixgbe/ixgbe_rxtx.c index
> 2f0262a..94051ca 100644
> --- a/drivers/net/ixgbe/ixgbe_rxtx.c
> +++ b/drivers/net/ixgbe/ixgbe_rxtx.c
> @@ -4814,6 +4814,34 @@ void __attribute__((cold))
> return 0;
> }
>
> +static int __attribute__((cold))
> +ixgbe_dev_jumboenable_check(struct rte_eth_dev *dev,
> + uint16_t max_rx_pkt_len)
> +{
> + struct rte_eth_dev_info dev_info;
> +
> + ixgbe_dev_info_get(dev, &dev_info);
> +
> + /* check that max packet size is within the allowed range */
> + if (max_rx_pkt_len < ETHER_MIN_MTU) {
> + PMD_INIT_LOG(ERR, "max packet size is too small.");
> + return -EINVAL;
> + }
> +
> + if (max_rx_pkt_len > dev_info.max_rx_pktlen) {
> + PMD_INIT_LOG(ERR, "max packet size is too big.");
> + return -EINVAL;
> + }
> +
> + /* check jumbo mode if needed */
> + if (max_rx_pkt_len < ETHER_MAX_LEN) {
> + PMD_INIT_LOG(ERR, "No need to enable jumbo.");
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> /*
> * Initializes Receive Unit.
> */
> @@ -4865,6 +4893,9 @@ int __attribute__((cold))
> * Configure jumbo frame support, if any.
> */
> if (rx_conf->offloads & DEV_RX_OFFLOAD_JUMBO_FRAME) {
> + if (ixgbe_dev_jumboenable_check(dev, rx_conf-
> >max_rx_pkt_len))
> + return -EINVAL;
> +
> hlreg0 |= IXGBE_HLREG0_JUMBOEN;
> maxfrs = IXGBE_READ_REG(hw, IXGBE_MAXFRS);
> maxfrs &= 0x0000FFFF;
> --
> 1.8.3.1
