Hi Yi,
> -----Original Message----- > From: dev [mailto:dev-boun...@dpdk.org] On Behalf Of Yi Zhang > Sent: Thursday, December 15, 2016 2:50 AM > To: maintai...@some.org > Cc: dev@dpdk.org; Yi Zhang > Subject: [dpdk-dev] [PATCH v3] net/ixgbe:fix max packet length in ixgbevf > > Current ixgbevf driver get max_rx_pktlen = 15872, but in fact PF supports > 15872-byte jumbo frame and VF only supports 9728-byte jumbo frame. If VF is > running DPDK driver and set frame_size > 9728 ,PF running kernel ixgbe driver > will report an error and set VF failed. > This patch fixs DPDK ixgbevf driver to get correct jumbo frame size of VF. > > Signed-off-by: Yi Zhang <zhang.y...@zte.com.cn> > --- > drivers/net/ixgbe/ixgbe_ethdev.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c > b/drivers/net/ixgbe/ixgbe_ethdev.c > index edc9b22..573252c 100644 > --- a/drivers/net/ixgbe/ixgbe_ethdev.c > +++ b/drivers/net/ixgbe/ixgbe_ethdev.c > @@ -3168,7 +3168,7 @@ ixgbevf_dev_info_get(struct rte_eth_dev *dev, > dev_info->max_rx_queues = (uint16_t)hw->mac.max_rx_queues; > dev_info->max_tx_queues = (uint16_t)hw->mac.max_tx_queues; > dev_info->min_rx_bufsize = 1024; /* cf BSIZEPACKET in SRRCTL reg */ > - dev_info->max_rx_pktlen = 15872; /* includes CRC, cf MAXFRS reg */ > + dev_info->max_rx_pktlen = 9728; /* includes CRC, cf MAXFRS reg */ I don't see any hard limit for the VF. I checked the kernel code. It defines 9728 as max frame size, I believe for both PF and VF. It's SW limitation. That's why you see the error. As kernel PF + dpdk VF is a common user case. I don't object to change the value to 9728. But I think some comments needed here to explain where this value comes from, because we can find the max frame size defined by dpdk, ETHER_MAX_JUMBO_FRAME_LEN, is different. > dev_info->max_mac_addrs = hw->mac.num_rar_entries; > dev_info->max_hash_mac_addrs = IXGBE_VMDQ_NUM_UC_MAC; > dev_info->max_vfs = dev->pci_dev->max_vfs; > -- > 2.9.3 >
