From 12cd0cccc3db2db2e7b1c3f295efa7b2751c06f0 Mon Sep 17 00:00:00 2001 From: Ivan Boule Date: Tue, 17 Jun 2014 20:09:31 +0200 Subject: [PATCH] ixgbevf: allow to set MTU The support of jumbo frames in the ixgbevf Poll Mode Driver of 10GbE 82599 VF functions consists in the following enhancements: - Implement the mtu_set function in the ixgbevf PMD, using the IXGBE_VF_SET_LPE request of the version 1.0 of the VF/PF mailbox API for this purpose. - Add a detailed explanation on the VF/PF rx max frame len negotiation. Signed-off-by: Ivan Boule Signed-off-by: David Marchand Acked-by: Konstantin Ananyev --- lib/librte_pmd_ixgbe/ixgbe_ethdev.c | 37 +++++++++++++++++++++++++++++ lib/librte_pmd_ixgbe/ixgbe_rxtx.c | 15 +++++++++++- 2 files changed, 51 insertions(+), 1 deletion(-) diff --git a/lib/librte_pmd_ixgbe/ixgbe_ethdev.c b/lib/librte_pmd_ixgbe/ixgbe_ethdev.c index fca8fd7ac7..85c4a77491 100644 --- a/lib/librte_pmd_ixgbe/ixgbe_ethdev.c +++ b/lib/librte_pmd_ixgbe/ixgbe_ethdev.c @@ -220,6 +220,8 @@ static int ixgbe_remove_5tuple_filter(struct rte_eth_dev *dev, static int ixgbe_get_5tuple_filter(struct rte_eth_dev *dev, uint16_t index, struct rte_5tuple_filter *filter, uint16_t *rx_queue); +static int ixgbevf_dev_set_mtu(struct rte_eth_dev *dev, uint16_t mtu); + /* * Define VF Stats MACRO for Non "cleared on read" register */ @@ -376,6 +378,7 @@ static struct eth_dev_ops ixgbevf_eth_dev_ops = { .stats_reset = ixgbevf_dev_stats_reset, .dev_close = ixgbevf_dev_close, .dev_infos_get = ixgbe_dev_info_get, + .mtu_set = ixgbevf_dev_set_mtu, .vlan_filter_set = ixgbevf_vlan_filter_set, .vlan_strip_queue_set = ixgbevf_vlan_strip_queue_set, .vlan_offload_set = ixgbevf_vlan_offload_set, @@ -3937,6 +3940,40 @@ ixgbe_get_5tuple_filter(struct rte_eth_dev *dev, uint16_t index, return -ENOENT; } +static int +ixgbevf_dev_set_mtu(struct rte_eth_dev *dev, uint16_t mtu) +{ + struct ixgbe_hw *hw; + uint32_t max_frame = mtu + ETHER_HDR_LEN + ETHER_CRC_LEN; + + hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private); + + if ((mtu < ETHER_MIN_MTU) || (max_frame > ETHER_MAX_JUMBO_FRAME_LEN)) + return -EINVAL; + + /* refuse mtu that requires the support of scattered packets when this + * feature has not been enabled before. */ + if (!dev->data->scattered_rx && + (max_frame + 2 * IXGBE_VLAN_TAG_SIZE > + dev->data->min_rx_buf_size - RTE_PKTMBUF_HEADROOM)) + return -EINVAL; + + /* + * When supported by the underlying PF driver, use the IXGBE_VF_SET_MTU + * request of the version 2.0 of the mailbox API. + * For now, use the IXGBE_VF_SET_LPE request of the version 1.0 + * of the mailbox API. + * This call to IXGBE_SET_LPE action won't work with ixgbe pf drivers + * prior to 3.11.33 which contains the following change: + * "ixgbe: Enable jumbo frames support w/ SR-IOV" + */ + ixgbevf_rlpml_set_vf(hw, max_frame); + + /* update max frame size */ + dev->data->dev_conf.rxmode.max_rx_pkt_len = max_frame; + return 0; +} + static struct rte_driver rte_ixgbe_driver = { .type = PMD_PDEV, .init = rte_ixgbe_pmd_init, diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c index 9b640e5a61..7f05b266cc 100644 --- a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c +++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c @@ -3883,7 +3883,20 @@ ixgbevf_dev_rx_init(struct rte_eth_dev *dev) PMD_INIT_FUNC_TRACE(); hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private); - /* setup MTU */ + /* + * When the VF driver issues a IXGBE_VF_RESET request, the PF driver + * disables the VF receipt of packets if the PF MTU is > 1500. + * This is done to deal with 82599 limitations that imposes + * the PF and all VFs to share the same MTU. + * Then, the PF driver enables again the VF receipt of packet when + * the VF driver issues a IXGBE_VF_SET_LPE request. + * In the meantime, the VF device cannot be used, even if the VF driver + * and the Guest VM network stack are ready to accept packets with a + * size up to the PF MTU. + * As a work-around to this PF behaviour, force the call to + * ixgbevf_rlpml_set_vf even if jumbo frames are not used. This way, + * VF packets received can work in all cases. + */ ixgbevf_rlpml_set_vf(hw, (uint16_t)dev->data->dev_conf.rxmode.max_rx_pkt_len); -- 2.20.1