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302 lines
8.4 KiB
302 lines
8.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* Copyright (c) 2019, Intel Corporation. */ |
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#include "ice_txrx_lib.h" |
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/** |
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* ice_release_rx_desc - Store the new tail and head values |
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* @rx_ring: ring to bump |
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* @val: new head index |
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*/ |
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void ice_release_rx_desc(struct ice_ring *rx_ring, u16 val) |
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{ |
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u16 prev_ntu = rx_ring->next_to_use & ~0x7; |
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rx_ring->next_to_use = val; |
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/* update next to alloc since we have filled the ring */ |
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rx_ring->next_to_alloc = val; |
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/* QRX_TAIL will be updated with any tail value, but hardware ignores |
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* the lower 3 bits. This makes it so we only bump tail on meaningful |
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* boundaries. Also, this allows us to bump tail on intervals of 8 up to |
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* the budget depending on the current traffic load. |
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*/ |
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val &= ~0x7; |
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if (prev_ntu != val) { |
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/* Force memory writes to complete before letting h/w |
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* know there are new descriptors to fetch. (Only |
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* applicable for weak-ordered memory model archs, |
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* such as IA-64). |
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*/ |
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wmb(); |
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writel(val, rx_ring->tail); |
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} |
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} |
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/** |
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* ice_ptype_to_htype - get a hash type |
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* @ptype: the ptype value from the descriptor |
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* |
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* Returns appropriate hash type (such as PKT_HASH_TYPE_L2/L3/L4) to be used by |
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* skb_set_hash based on PTYPE as parsed by HW Rx pipeline and is part of |
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* Rx desc. |
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*/ |
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static enum pkt_hash_types ice_ptype_to_htype(u16 ptype) |
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{ |
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struct ice_rx_ptype_decoded decoded = ice_decode_rx_desc_ptype(ptype); |
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if (!decoded.known) |
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return PKT_HASH_TYPE_NONE; |
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if (decoded.payload_layer == ICE_RX_PTYPE_PAYLOAD_LAYER_PAY4) |
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return PKT_HASH_TYPE_L4; |
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if (decoded.payload_layer == ICE_RX_PTYPE_PAYLOAD_LAYER_PAY3) |
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return PKT_HASH_TYPE_L3; |
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if (decoded.outer_ip == ICE_RX_PTYPE_OUTER_L2) |
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return PKT_HASH_TYPE_L2; |
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return PKT_HASH_TYPE_NONE; |
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} |
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/** |
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* ice_rx_hash - set the hash value in the skb |
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* @rx_ring: descriptor ring |
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* @rx_desc: specific descriptor |
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* @skb: pointer to current skb |
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* @rx_ptype: the ptype value from the descriptor |
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*/ |
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static void |
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ice_rx_hash(struct ice_ring *rx_ring, union ice_32b_rx_flex_desc *rx_desc, |
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struct sk_buff *skb, u16 rx_ptype) |
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{ |
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struct ice_32b_rx_flex_desc_nic *nic_mdid; |
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u32 hash; |
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if (!(rx_ring->netdev->features & NETIF_F_RXHASH)) |
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return; |
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if (rx_desc->wb.rxdid != ICE_RXDID_FLEX_NIC) |
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return; |
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nic_mdid = (struct ice_32b_rx_flex_desc_nic *)rx_desc; |
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hash = le32_to_cpu(nic_mdid->rss_hash); |
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skb_set_hash(skb, hash, ice_ptype_to_htype(rx_ptype)); |
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} |
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/** |
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* ice_rx_csum - Indicate in skb if checksum is good |
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* @ring: the ring we care about |
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* @skb: skb currently being received and modified |
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* @rx_desc: the receive descriptor |
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* @ptype: the packet type decoded by hardware |
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* |
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* skb->protocol must be set before this function is called |
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*/ |
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static void |
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ice_rx_csum(struct ice_ring *ring, struct sk_buff *skb, |
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union ice_32b_rx_flex_desc *rx_desc, u16 ptype) |
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{ |
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struct ice_rx_ptype_decoded decoded; |
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u16 rx_status0, rx_status1; |
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bool ipv4, ipv6; |
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rx_status0 = le16_to_cpu(rx_desc->wb.status_error0); |
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rx_status1 = le16_to_cpu(rx_desc->wb.status_error1); |
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decoded = ice_decode_rx_desc_ptype(ptype); |
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/* Start with CHECKSUM_NONE and by default csum_level = 0 */ |
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skb->ip_summed = CHECKSUM_NONE; |
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skb_checksum_none_assert(skb); |
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/* check if Rx checksum is enabled */ |
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if (!(ring->netdev->features & NETIF_F_RXCSUM)) |
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return; |
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/* check if HW has decoded the packet and checksum */ |
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if (!(rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_L3L4P_S))) |
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return; |
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if (!(decoded.known && decoded.outer_ip)) |
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return; |
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ipv4 = (decoded.outer_ip == ICE_RX_PTYPE_OUTER_IP) && |
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(decoded.outer_ip_ver == ICE_RX_PTYPE_OUTER_IPV4); |
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ipv6 = (decoded.outer_ip == ICE_RX_PTYPE_OUTER_IP) && |
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(decoded.outer_ip_ver == ICE_RX_PTYPE_OUTER_IPV6); |
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if (ipv4 && (rx_status0 & (BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_IPE_S) | |
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BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_EIPE_S)))) |
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goto checksum_fail; |
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if (ipv6 && (rx_status0 & (BIT(ICE_RX_FLEX_DESC_STATUS0_IPV6EXADD_S)))) |
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goto checksum_fail; |
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/* check for L4 errors and handle packets that were not able to be |
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* checksummed due to arrival speed |
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*/ |
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if (rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_L4E_S)) |
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goto checksum_fail; |
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/* check for outer UDP checksum error in tunneled packets */ |
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if ((rx_status1 & BIT(ICE_RX_FLEX_DESC_STATUS1_NAT_S)) && |
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(rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_EUDPE_S))) |
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goto checksum_fail; |
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/* If there is an outer header present that might contain a checksum |
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* we need to bump the checksum level by 1 to reflect the fact that |
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* we are indicating we validated the inner checksum. |
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*/ |
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if (decoded.tunnel_type >= ICE_RX_PTYPE_TUNNEL_IP_GRENAT) |
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skb->csum_level = 1; |
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/* Only report checksum unnecessary for TCP, UDP, or SCTP */ |
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switch (decoded.inner_prot) { |
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case ICE_RX_PTYPE_INNER_PROT_TCP: |
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case ICE_RX_PTYPE_INNER_PROT_UDP: |
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case ICE_RX_PTYPE_INNER_PROT_SCTP: |
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skb->ip_summed = CHECKSUM_UNNECESSARY; |
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break; |
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default: |
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break; |
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} |
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return; |
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checksum_fail: |
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ring->vsi->back->hw_csum_rx_error++; |
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} |
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/** |
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* ice_process_skb_fields - Populate skb header fields from Rx descriptor |
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* @rx_ring: Rx descriptor ring packet is being transacted on |
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* @rx_desc: pointer to the EOP Rx descriptor |
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* @skb: pointer to current skb being populated |
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* @ptype: the packet type decoded by hardware |
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* |
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* This function checks the ring, descriptor, and packet information in |
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* order to populate the hash, checksum, VLAN, protocol, and |
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* other fields within the skb. |
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*/ |
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void |
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ice_process_skb_fields(struct ice_ring *rx_ring, |
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union ice_32b_rx_flex_desc *rx_desc, |
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struct sk_buff *skb, u16 ptype) |
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{ |
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ice_rx_hash(rx_ring, rx_desc, skb, ptype); |
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/* modifies the skb - consumes the enet header */ |
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skb->protocol = eth_type_trans(skb, rx_ring->netdev); |
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ice_rx_csum(rx_ring, skb, rx_desc, ptype); |
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if (rx_ring->ptp_rx) |
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ice_ptp_rx_hwtstamp(rx_ring, rx_desc, skb); |
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} |
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/** |
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* ice_receive_skb - Send a completed packet up the stack |
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* @rx_ring: Rx ring in play |
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* @skb: packet to send up |
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* @vlan_tag: VLAN tag for packet |
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* |
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* This function sends the completed packet (via. skb) up the stack using |
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* gro receive functions (with/without VLAN tag) |
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*/ |
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void |
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ice_receive_skb(struct ice_ring *rx_ring, struct sk_buff *skb, u16 vlan_tag) |
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{ |
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if ((rx_ring->netdev->features & NETIF_F_HW_VLAN_CTAG_RX) && |
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(vlan_tag & VLAN_VID_MASK)) |
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__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tag); |
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napi_gro_receive(&rx_ring->q_vector->napi, skb); |
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} |
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/** |
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* ice_xmit_xdp_ring - submit single packet to XDP ring for transmission |
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* @data: packet data pointer |
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* @size: packet data size |
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* @xdp_ring: XDP ring for transmission |
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*/ |
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int ice_xmit_xdp_ring(void *data, u16 size, struct ice_ring *xdp_ring) |
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{ |
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u16 i = xdp_ring->next_to_use; |
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struct ice_tx_desc *tx_desc; |
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struct ice_tx_buf *tx_buf; |
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dma_addr_t dma; |
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if (!unlikely(ICE_DESC_UNUSED(xdp_ring))) { |
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xdp_ring->tx_stats.tx_busy++; |
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return ICE_XDP_CONSUMED; |
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} |
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dma = dma_map_single(xdp_ring->dev, data, size, DMA_TO_DEVICE); |
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if (dma_mapping_error(xdp_ring->dev, dma)) |
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return ICE_XDP_CONSUMED; |
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tx_buf = &xdp_ring->tx_buf[i]; |
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tx_buf->bytecount = size; |
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tx_buf->gso_segs = 1; |
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tx_buf->raw_buf = data; |
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/* record length, and DMA address */ |
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dma_unmap_len_set(tx_buf, len, size); |
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dma_unmap_addr_set(tx_buf, dma, dma); |
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tx_desc = ICE_TX_DESC(xdp_ring, i); |
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tx_desc->buf_addr = cpu_to_le64(dma); |
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tx_desc->cmd_type_offset_bsz = ice_build_ctob(ICE_TXD_LAST_DESC_CMD, 0, |
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size, 0); |
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/* Make certain all of the status bits have been updated |
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* before next_to_watch is written. |
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*/ |
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smp_wmb(); |
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i++; |
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if (i == xdp_ring->count) |
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i = 0; |
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tx_buf->next_to_watch = tx_desc; |
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xdp_ring->next_to_use = i; |
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return ICE_XDP_TX; |
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} |
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/** |
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* ice_xmit_xdp_buff - convert an XDP buffer to an XDP frame and send it |
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* @xdp: XDP buffer |
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* @xdp_ring: XDP Tx ring |
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* |
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* Returns negative on failure, 0 on success. |
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*/ |
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int ice_xmit_xdp_buff(struct xdp_buff *xdp, struct ice_ring *xdp_ring) |
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{ |
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struct xdp_frame *xdpf = xdp_convert_buff_to_frame(xdp); |
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if (unlikely(!xdpf)) |
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return ICE_XDP_CONSUMED; |
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return ice_xmit_xdp_ring(xdpf->data, xdpf->len, xdp_ring); |
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} |
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/** |
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* ice_finalize_xdp_rx - Bump XDP Tx tail and/or flush redirect map |
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* @rx_ring: Rx ring |
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* @xdp_res: Result of the receive batch |
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* |
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* This function bumps XDP Tx tail and/or flush redirect map, and |
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* should be called when a batch of packets has been processed in the |
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* napi loop. |
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*/ |
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void ice_finalize_xdp_rx(struct ice_ring *rx_ring, unsigned int xdp_res) |
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{ |
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if (xdp_res & ICE_XDP_REDIR) |
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xdp_do_flush_map(); |
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if (xdp_res & ICE_XDP_TX) { |
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struct ice_ring *xdp_ring = |
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rx_ring->vsi->xdp_rings[rx_ring->q_index]; |
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ice_xdp_ring_update_tail(xdp_ring); |
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} |
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}
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