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1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2019, Intel Corporation. */
3
4#include <linux/filter.h>
5
6#include "ice_txrx_lib.h"
7#include "ice_eswitch.h"
8#include "ice_lib.h"
9
10/**
11 * ice_release_rx_desc - Store the new tail and head values
12 * @rx_ring: ring to bump
13 * @val: new head index
14 */
15void ice_release_rx_desc(struct ice_rx_ring *rx_ring, u16 val)
16{
17 u16 prev_ntu = rx_ring->next_to_use & ~0x7;
18
19 rx_ring->next_to_use = val;
20
21 /* update next to alloc since we have filled the ring */
22 rx_ring->next_to_alloc = val;
23
24 /* QRX_TAIL will be updated with any tail value, but hardware ignores
25 * the lower 3 bits. This makes it so we only bump tail on meaningful
26 * boundaries. Also, this allows us to bump tail on intervals of 8 up to
27 * the budget depending on the current traffic load.
28 */
29 val &= ~0x7;
30 if (prev_ntu != val) {
31 /* Force memory writes to complete before letting h/w
32 * know there are new descriptors to fetch. (Only
33 * applicable for weak-ordered memory model archs,
34 * such as IA-64).
35 */
36 wmb();
37 writel(val, rx_ring->tail);
38 }
39}
40
41/**
42 * ice_ptype_to_htype - get a hash type
43 * @ptype: the ptype value from the descriptor
44 *
45 * Returns appropriate hash type (such as PKT_HASH_TYPE_L2/L3/L4) to be used by
46 * skb_set_hash based on PTYPE as parsed by HW Rx pipeline and is part of
47 * Rx desc.
48 */
49static enum pkt_hash_types ice_ptype_to_htype(u16 ptype)
50{
51 struct ice_rx_ptype_decoded decoded = ice_decode_rx_desc_ptype(ptype);
52
53 if (!decoded.known)
54 return PKT_HASH_TYPE_NONE;
55 if (decoded.payload_layer == ICE_RX_PTYPE_PAYLOAD_LAYER_PAY4)
56 return PKT_HASH_TYPE_L4;
57 if (decoded.payload_layer == ICE_RX_PTYPE_PAYLOAD_LAYER_PAY3)
58 return PKT_HASH_TYPE_L3;
59 if (decoded.outer_ip == ICE_RX_PTYPE_OUTER_L2)
60 return PKT_HASH_TYPE_L2;
61
62 return PKT_HASH_TYPE_NONE;
63}
64
65/**
66 * ice_rx_hash - set the hash value in the skb
67 * @rx_ring: descriptor ring
68 * @rx_desc: specific descriptor
69 * @skb: pointer to current skb
70 * @rx_ptype: the ptype value from the descriptor
71 */
72static void
73ice_rx_hash(struct ice_rx_ring *rx_ring, union ice_32b_rx_flex_desc *rx_desc,
74 struct sk_buff *skb, u16 rx_ptype)
75{
76 struct ice_32b_rx_flex_desc_nic *nic_mdid;
77 u32 hash;
78
79 if (!(rx_ring->netdev->features & NETIF_F_RXHASH))
80 return;
81
82 if (rx_desc->wb.rxdid != ICE_RXDID_FLEX_NIC)
83 return;
84
85 nic_mdid = (struct ice_32b_rx_flex_desc_nic *)rx_desc;
86 hash = le32_to_cpu(nic_mdid->rss_hash);
87 skb_set_hash(skb, hash, ice_ptype_to_htype(rx_ptype));
88}
89
90/**
91 * ice_rx_csum - Indicate in skb if checksum is good
92 * @ring: the ring we care about
93 * @skb: skb currently being received and modified
94 * @rx_desc: the receive descriptor
95 * @ptype: the packet type decoded by hardware
96 *
97 * skb->protocol must be set before this function is called
98 */
99static void
100ice_rx_csum(struct ice_rx_ring *ring, struct sk_buff *skb,
101 union ice_32b_rx_flex_desc *rx_desc, u16 ptype)
102{
103 struct ice_rx_ptype_decoded decoded;
104 u16 rx_status0, rx_status1;
105 bool ipv4, ipv6;
106
107 rx_status0 = le16_to_cpu(rx_desc->wb.status_error0);
108 rx_status1 = le16_to_cpu(rx_desc->wb.status_error1);
109
110 decoded = ice_decode_rx_desc_ptype(ptype);
111
112 /* Start with CHECKSUM_NONE and by default csum_level = 0 */
113 skb->ip_summed = CHECKSUM_NONE;
114 skb_checksum_none_assert(skb);
115
116 /* check if Rx checksum is enabled */
117 if (!(ring->netdev->features & NETIF_F_RXCSUM))
118 return;
119
120 /* check if HW has decoded the packet and checksum */
121 if (!(rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_L3L4P_S)))
122 return;
123
124 if (!(decoded.known && decoded.outer_ip))
125 return;
126
127 ipv4 = (decoded.outer_ip == ICE_RX_PTYPE_OUTER_IP) &&
128 (decoded.outer_ip_ver == ICE_RX_PTYPE_OUTER_IPV4);
129 ipv6 = (decoded.outer_ip == ICE_RX_PTYPE_OUTER_IP) &&
130 (decoded.outer_ip_ver == ICE_RX_PTYPE_OUTER_IPV6);
131
132 if (ipv4 && (rx_status0 & (BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_IPE_S) |
133 BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_EIPE_S))))
134 goto checksum_fail;
135
136 if (ipv6 && (rx_status0 & (BIT(ICE_RX_FLEX_DESC_STATUS0_IPV6EXADD_S))))
137 goto checksum_fail;
138
139 /* check for L4 errors and handle packets that were not able to be
140 * checksummed due to arrival speed
141 */
142 if (rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_L4E_S))
143 goto checksum_fail;
144
145 /* check for outer UDP checksum error in tunneled packets */
146 if ((rx_status1 & BIT(ICE_RX_FLEX_DESC_STATUS1_NAT_S)) &&
147 (rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_EUDPE_S)))
148 goto checksum_fail;
149
150 /* If there is an outer header present that might contain a checksum
151 * we need to bump the checksum level by 1 to reflect the fact that
152 * we are indicating we validated the inner checksum.
153 */
154 if (decoded.tunnel_type >= ICE_RX_PTYPE_TUNNEL_IP_GRENAT)
155 skb->csum_level = 1;
156
157 /* Only report checksum unnecessary for TCP, UDP, or SCTP */
158 switch (decoded.inner_prot) {
159 case ICE_RX_PTYPE_INNER_PROT_TCP:
160 case ICE_RX_PTYPE_INNER_PROT_UDP:
161 case ICE_RX_PTYPE_INNER_PROT_SCTP:
162 skb->ip_summed = CHECKSUM_UNNECESSARY;
163 break;
164 default:
165 break;
166 }
167 return;
168
169checksum_fail:
170 ring->vsi->back->hw_csum_rx_error++;
171}
172
173/**
174 * ice_process_skb_fields - Populate skb header fields from Rx descriptor
175 * @rx_ring: Rx descriptor ring packet is being transacted on
176 * @rx_desc: pointer to the EOP Rx descriptor
177 * @skb: pointer to current skb being populated
178 * @ptype: the packet type decoded by hardware
179 *
180 * This function checks the ring, descriptor, and packet information in
181 * order to populate the hash, checksum, VLAN, protocol, and
182 * other fields within the skb.
183 */
184void
185ice_process_skb_fields(struct ice_rx_ring *rx_ring,
186 union ice_32b_rx_flex_desc *rx_desc,
187 struct sk_buff *skb, u16 ptype)
188{
189 ice_rx_hash(rx_ring, rx_desc, skb, ptype);
190
191 /* modifies the skb - consumes the enet header */
192 skb->protocol = eth_type_trans(skb, rx_ring->netdev);
193
194 ice_rx_csum(rx_ring, skb, rx_desc, ptype);
195
196 if (rx_ring->ptp_rx)
197 ice_ptp_rx_hwtstamp(rx_ring, rx_desc, skb);
198}
199
200/**
201 * ice_receive_skb - Send a completed packet up the stack
202 * @rx_ring: Rx ring in play
203 * @skb: packet to send up
204 * @vlan_tag: VLAN tag for packet
205 *
206 * This function sends the completed packet (via. skb) up the stack using
207 * gro receive functions (with/without VLAN tag)
208 */
209void
210ice_receive_skb(struct ice_rx_ring *rx_ring, struct sk_buff *skb, u16 vlan_tag)
211{
212 netdev_features_t features = rx_ring->netdev->features;
213 bool non_zero_vlan = !!(vlan_tag & VLAN_VID_MASK);
214
215 if ((features & NETIF_F_HW_VLAN_CTAG_RX) && non_zero_vlan)
216 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tag);
217 else if ((features & NETIF_F_HW_VLAN_STAG_RX) && non_zero_vlan)
218 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021AD), vlan_tag);
219
220 napi_gro_receive(&rx_ring->q_vector->napi, skb);
221}
222
223/**
224 * ice_clean_xdp_irq - Reclaim resources after transmit completes on XDP ring
225 * @xdp_ring: XDP ring to clean
226 */
227static void ice_clean_xdp_irq(struct ice_tx_ring *xdp_ring)
228{
229 unsigned int total_bytes = 0, total_pkts = 0;
230 u16 tx_thresh = ICE_RING_QUARTER(xdp_ring);
231 u16 ntc = xdp_ring->next_to_clean;
232 struct ice_tx_desc *next_dd_desc;
233 u16 next_dd = xdp_ring->next_dd;
234 struct ice_tx_buf *tx_buf;
235 int i;
236
237 next_dd_desc = ICE_TX_DESC(xdp_ring, next_dd);
238 if (!(next_dd_desc->cmd_type_offset_bsz &
239 cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE)))
240 return;
241
242 for (i = 0; i < tx_thresh; i++) {
243 tx_buf = &xdp_ring->tx_buf[ntc];
244
245 total_bytes += tx_buf->bytecount;
246 /* normally tx_buf->gso_segs was taken but at this point
247 * it's always 1 for us
248 */
249 total_pkts++;
250
251 page_frag_free(tx_buf->raw_buf);
252 dma_unmap_single(xdp_ring->dev, dma_unmap_addr(tx_buf, dma),
253 dma_unmap_len(tx_buf, len), DMA_TO_DEVICE);
254 dma_unmap_len_set(tx_buf, len, 0);
255 tx_buf->raw_buf = NULL;
256
257 ntc++;
258 if (ntc >= xdp_ring->count)
259 ntc = 0;
260 }
261
262 next_dd_desc->cmd_type_offset_bsz = 0;
263 xdp_ring->next_dd = xdp_ring->next_dd + tx_thresh;
264 if (xdp_ring->next_dd > xdp_ring->count)
265 xdp_ring->next_dd = tx_thresh - 1;
266 xdp_ring->next_to_clean = ntc;
267 ice_update_tx_ring_stats(xdp_ring, total_pkts, total_bytes);
268}
269
270/**
271 * ice_xmit_xdp_ring - submit single packet to XDP ring for transmission
272 * @data: packet data pointer
273 * @size: packet data size
274 * @xdp_ring: XDP ring for transmission
275 */
276int ice_xmit_xdp_ring(void *data, u16 size, struct ice_tx_ring *xdp_ring)
277{
278 u16 tx_thresh = ICE_RING_QUARTER(xdp_ring);
279 u16 i = xdp_ring->next_to_use;
280 struct ice_tx_desc *tx_desc;
281 struct ice_tx_buf *tx_buf;
282 dma_addr_t dma;
283
284 if (ICE_DESC_UNUSED(xdp_ring) < tx_thresh)
285 ice_clean_xdp_irq(xdp_ring);
286
287 if (!unlikely(ICE_DESC_UNUSED(xdp_ring))) {
288 xdp_ring->ring_stats->tx_stats.tx_busy++;
289 return ICE_XDP_CONSUMED;
290 }
291
292 dma = dma_map_single(xdp_ring->dev, data, size, DMA_TO_DEVICE);
293 if (dma_mapping_error(xdp_ring->dev, dma))
294 return ICE_XDP_CONSUMED;
295
296 tx_buf = &xdp_ring->tx_buf[i];
297 tx_buf->bytecount = size;
298 tx_buf->gso_segs = 1;
299 tx_buf->raw_buf = data;
300
301 /* record length, and DMA address */
302 dma_unmap_len_set(tx_buf, len, size);
303 dma_unmap_addr_set(tx_buf, dma, dma);
304
305 tx_desc = ICE_TX_DESC(xdp_ring, i);
306 tx_desc->buf_addr = cpu_to_le64(dma);
307 tx_desc->cmd_type_offset_bsz = ice_build_ctob(ICE_TX_DESC_CMD_EOP, 0,
308 size, 0);
309
310 xdp_ring->xdp_tx_active++;
311 i++;
312 if (i == xdp_ring->count) {
313 i = 0;
314 tx_desc = ICE_TX_DESC(xdp_ring, xdp_ring->next_rs);
315 tx_desc->cmd_type_offset_bsz |=
316 cpu_to_le64(ICE_TX_DESC_CMD_RS << ICE_TXD_QW1_CMD_S);
317 xdp_ring->next_rs = tx_thresh - 1;
318 }
319 xdp_ring->next_to_use = i;
320
321 if (i > xdp_ring->next_rs) {
322 tx_desc = ICE_TX_DESC(xdp_ring, xdp_ring->next_rs);
323 tx_desc->cmd_type_offset_bsz |=
324 cpu_to_le64(ICE_TX_DESC_CMD_RS << ICE_TXD_QW1_CMD_S);
325 xdp_ring->next_rs += tx_thresh;
326 }
327
328 return ICE_XDP_TX;
329}
330
331/**
332 * ice_xmit_xdp_buff - convert an XDP buffer to an XDP frame and send it
333 * @xdp: XDP buffer
334 * @xdp_ring: XDP Tx ring
335 *
336 * Returns negative on failure, 0 on success.
337 */
338int ice_xmit_xdp_buff(struct xdp_buff *xdp, struct ice_tx_ring *xdp_ring)
339{
340 struct xdp_frame *xdpf = xdp_convert_buff_to_frame(xdp);
341
342 if (unlikely(!xdpf))
343 return ICE_XDP_CONSUMED;
344
345 return ice_xmit_xdp_ring(xdpf->data, xdpf->len, xdp_ring);
346}
347
348/**
349 * ice_finalize_xdp_rx - Bump XDP Tx tail and/or flush redirect map
350 * @xdp_ring: XDP ring
351 * @xdp_res: Result of the receive batch
352 *
353 * This function bumps XDP Tx tail and/or flush redirect map, and
354 * should be called when a batch of packets has been processed in the
355 * napi loop.
356 */
357void ice_finalize_xdp_rx(struct ice_tx_ring *xdp_ring, unsigned int xdp_res)
358{
359 if (xdp_res & ICE_XDP_REDIR)
360 xdp_do_flush_map();
361
362 if (xdp_res & ICE_XDP_TX) {
363 if (static_branch_unlikely(&ice_xdp_locking_key))
364 spin_lock(&xdp_ring->tx_lock);
365 ice_xdp_ring_update_tail(xdp_ring);
366 if (static_branch_unlikely(&ice_xdp_locking_key))
367 spin_unlock(&xdp_ring->tx_lock);
368 }
369}