blob: bc2f4390b51dc67b2ef8cf929a6451a0259e3d51 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019, Intel Corporation. */
#include "ice_txrx_lib.h"
/**
* ice_release_rx_desc - Store the new tail and head values
* @rx_ring: ring to bump
* @val: new head index
*/
void ice_release_rx_desc(struct ice_ring *rx_ring, u16 val)
{
u16 prev_ntu = rx_ring->next_to_use & ~0x7;
rx_ring->next_to_use = val;
/* update next to alloc since we have filled the ring */
rx_ring->next_to_alloc = val;
/* QRX_TAIL will be updated with any tail value, but hardware ignores
* the lower 3 bits. This makes it so we only bump tail on meaningful
* boundaries. Also, this allows us to bump tail on intervals of 8 up to
* the budget depending on the current traffic load.
*/
val &= ~0x7;
if (prev_ntu != val) {
/* Force memory writes to complete before letting h/w
* know there are new descriptors to fetch. (Only
* applicable for weak-ordered memory model archs,
* such as IA-64).
*/
wmb();
writel(val, rx_ring->tail);
}
}
/**
* ice_ptype_to_htype - get a hash type
* @ptype: the ptype value from the descriptor
*
* Returns a hash type to be used by skb_set_hash
*/
static enum pkt_hash_types ice_ptype_to_htype(u8 __always_unused ptype)
{
return PKT_HASH_TYPE_NONE;
}
/**
* ice_rx_hash - set the hash value in the skb
* @rx_ring: descriptor ring
* @rx_desc: specific descriptor
* @skb: pointer to current skb
* @rx_ptype: the ptype value from the descriptor
*/
static void
ice_rx_hash(struct ice_ring *rx_ring, union ice_32b_rx_flex_desc *rx_desc,
struct sk_buff *skb, u8 rx_ptype)
{
struct ice_32b_rx_flex_desc_nic *nic_mdid;
u32 hash;
if (!(rx_ring->netdev->features & NETIF_F_RXHASH))
return;
if (rx_desc->wb.rxdid != ICE_RXDID_FLEX_NIC)
return;
nic_mdid = (struct ice_32b_rx_flex_desc_nic *)rx_desc;
hash = le32_to_cpu(nic_mdid->rss_hash);
skb_set_hash(skb, hash, ice_ptype_to_htype(rx_ptype));
}
/**
* ice_rx_csum - Indicate in skb if checksum is good
* @ring: the ring we care about
* @skb: skb currently being received and modified
* @rx_desc: the receive descriptor
* @ptype: the packet type decoded by hardware
*
* skb->protocol must be set before this function is called
*/
static void
ice_rx_csum(struct ice_ring *ring, struct sk_buff *skb,
union ice_32b_rx_flex_desc *rx_desc, u8 ptype)
{
struct ice_rx_ptype_decoded decoded;
u16 rx_status0, rx_status1;
bool ipv4, ipv6;
rx_status0 = le16_to_cpu(rx_desc->wb.status_error0);
rx_status1 = le16_to_cpu(rx_desc->wb.status_error1);
decoded = ice_decode_rx_desc_ptype(ptype);
/* Start with CHECKSUM_NONE and by default csum_level = 0 */
skb->ip_summed = CHECKSUM_NONE;
skb_checksum_none_assert(skb);
/* check if Rx checksum is enabled */
if (!(ring->netdev->features & NETIF_F_RXCSUM))
return;
/* check if HW has decoded the packet and checksum */
if (!(rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_L3L4P_S)))
return;
if (!(decoded.known && decoded.outer_ip))
return;
ipv4 = (decoded.outer_ip == ICE_RX_PTYPE_OUTER_IP) &&
(decoded.outer_ip_ver == ICE_RX_PTYPE_OUTER_IPV4);
ipv6 = (decoded.outer_ip == ICE_RX_PTYPE_OUTER_IP) &&
(decoded.outer_ip_ver == ICE_RX_PTYPE_OUTER_IPV6);
if (ipv4 && (rx_status0 & (BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_IPE_S) |
BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_EIPE_S))))
goto checksum_fail;
if (ipv6 && (rx_status0 & (BIT(ICE_RX_FLEX_DESC_STATUS0_IPV6EXADD_S))))
goto checksum_fail;
/* check for L4 errors and handle packets that were not able to be
* checksummed due to arrival speed
*/
if (rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_L4E_S))
goto checksum_fail;
/* check for outer UDP checksum error in tunneled packets */
if ((rx_status1 & BIT(ICE_RX_FLEX_DESC_STATUS1_NAT_S)) &&
(rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_EUDPE_S)))
goto checksum_fail;
/* If there is an outer header present that might contain a checksum
* we need to bump the checksum level by 1 to reflect the fact that
* we are indicating we validated the inner checksum.
*/
if (decoded.tunnel_type >= ICE_RX_PTYPE_TUNNEL_IP_GRENAT)
skb->csum_level = 1;
/* Only report checksum unnecessary for TCP, UDP, or SCTP */
switch (decoded.inner_prot) {
case ICE_RX_PTYPE_INNER_PROT_TCP:
case ICE_RX_PTYPE_INNER_PROT_UDP:
case ICE_RX_PTYPE_INNER_PROT_SCTP:
skb->ip_summed = CHECKSUM_UNNECESSARY;
default:
break;
}
return;
checksum_fail:
ring->vsi->back->hw_csum_rx_error++;
}
/**
* ice_process_skb_fields - Populate skb header fields from Rx descriptor
* @rx_ring: Rx descriptor ring packet is being transacted on
* @rx_desc: pointer to the EOP Rx descriptor
* @skb: pointer to current skb being populated
* @ptype: the packet type decoded by hardware
*
* This function checks the ring, descriptor, and packet information in
* order to populate the hash, checksum, VLAN, protocol, and
* other fields within the skb.
*/
void
ice_process_skb_fields(struct ice_ring *rx_ring,
union ice_32b_rx_flex_desc *rx_desc,
struct sk_buff *skb, u8 ptype)
{
ice_rx_hash(rx_ring, rx_desc, skb, ptype);
/* modifies the skb - consumes the enet header */
skb->protocol = eth_type_trans(skb, rx_ring->netdev);
ice_rx_csum(rx_ring, skb, rx_desc, ptype);
}
/**
* ice_receive_skb - Send a completed packet up the stack
* @rx_ring: Rx ring in play
* @skb: packet to send up
* @vlan_tag: VLAN tag for packet
*
* This function sends the completed packet (via. skb) up the stack using
* gro receive functions (with/without VLAN tag)
*/
void
ice_receive_skb(struct ice_ring *rx_ring, struct sk_buff *skb, u16 vlan_tag)
{
if ((rx_ring->netdev->features & NETIF_F_HW_VLAN_CTAG_RX) &&
(vlan_tag & VLAN_VID_MASK))
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tag);
if (napi_gro_receive(&rx_ring->q_vector->napi, skb) == GRO_DROP) {
/* this is tracked separately to help us debug stack drops */
rx_ring->rx_stats.gro_dropped++;
netdev_dbg(rx_ring->netdev, "Receive Queue %d: Dropped packet from GRO\n",
rx_ring->q_index);
}
}
/**
* ice_xmit_xdp_ring - submit single packet to XDP ring for transmission
* @data: packet data pointer
* @size: packet data size
* @xdp_ring: XDP ring for transmission
*/
int ice_xmit_xdp_ring(void *data, u16 size, struct ice_ring *xdp_ring)
{
u16 i = xdp_ring->next_to_use;
struct ice_tx_desc *tx_desc;
struct ice_tx_buf *tx_buf;
dma_addr_t dma;
if (!unlikely(ICE_DESC_UNUSED(xdp_ring))) {
xdp_ring->tx_stats.tx_busy++;
return ICE_XDP_CONSUMED;
}
dma = dma_map_single(xdp_ring->dev, data, size, DMA_TO_DEVICE);
if (dma_mapping_error(xdp_ring->dev, dma))
return ICE_XDP_CONSUMED;
tx_buf = &xdp_ring->tx_buf[i];
tx_buf->bytecount = size;
tx_buf->gso_segs = 1;
tx_buf->raw_buf = data;
/* record length, and DMA address */
dma_unmap_len_set(tx_buf, len, size);
dma_unmap_addr_set(tx_buf, dma, dma);
tx_desc = ICE_TX_DESC(xdp_ring, i);
tx_desc->buf_addr = cpu_to_le64(dma);
tx_desc->cmd_type_offset_bsz = ice_build_ctob(ICE_TXD_LAST_DESC_CMD, 0,
size, 0);
/* Make certain all of the status bits have been updated
* before next_to_watch is written.
*/
smp_wmb();
i++;
if (i == xdp_ring->count)
i = 0;
tx_buf->next_to_watch = tx_desc;
xdp_ring->next_to_use = i;
return ICE_XDP_TX;
}
/**
* ice_xmit_xdp_buff - convert an XDP buffer to an XDP frame and send it
* @xdp: XDP buffer
* @xdp_ring: XDP Tx ring
*
* Returns negative on failure, 0 on success.
*/
int ice_xmit_xdp_buff(struct xdp_buff *xdp, struct ice_ring *xdp_ring)
{
struct xdp_frame *xdpf = xdp_convert_buff_to_frame(xdp);
if (unlikely(!xdpf))
return ICE_XDP_CONSUMED;
return ice_xmit_xdp_ring(xdpf->data, xdpf->len, xdp_ring);
}
/**
* ice_finalize_xdp_rx - Bump XDP Tx tail and/or flush redirect map
* @rx_ring: Rx ring
* @xdp_res: Result of the receive batch
*
* This function bumps XDP Tx tail and/or flush redirect map, and
* should be called when a batch of packets has been processed in the
* napi loop.
*/
void ice_finalize_xdp_rx(struct ice_ring *rx_ring, unsigned int xdp_res)
{
if (xdp_res & ICE_XDP_REDIR)
xdp_do_flush_map();
if (xdp_res & ICE_XDP_TX) {
struct ice_ring *xdp_ring =
rx_ring->vsi->xdp_rings[rx_ring->q_index];
ice_xdp_ring_update_tail(xdp_ring);
}
}