1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 /* Copyright (C) 2019 Netronome Systems, Inc. */
3
4 #include <linux/seq_file.h>
5
6 #include "../nfp_net.h"
7 #include "../nfp_net_dp.h"
8 #include "nfdk.h"
9
10 static void
nfp_nfdk_tx_ring_reset(struct nfp_net_dp * dp,struct nfp_net_tx_ring * tx_ring)11 nfp_nfdk_tx_ring_reset(struct nfp_net_dp *dp, struct nfp_net_tx_ring *tx_ring)
12 {
13 struct device *dev = dp->dev;
14 struct netdev_queue *nd_q;
15
16 while (!tx_ring->is_xdp && tx_ring->rd_p != tx_ring->wr_p) {
17 const skb_frag_t *frag, *fend;
18 unsigned int size, n_descs = 1;
19 struct nfp_nfdk_tx_buf *txbuf;
20 int nr_frags, rd_idx;
21 struct sk_buff *skb;
22
23 rd_idx = D_IDX(tx_ring, tx_ring->rd_p);
24 txbuf = &tx_ring->ktxbufs[rd_idx];
25
26 skb = txbuf->skb;
27 if (!skb) {
28 n_descs = D_BLOCK_CPL(tx_ring->rd_p);
29 goto next;
30 }
31
32 nr_frags = skb_shinfo(skb)->nr_frags;
33 txbuf++;
34
35 /* Unmap head */
36 size = skb_headlen(skb);
37 dma_unmap_single(dev, txbuf->dma_addr, size, DMA_TO_DEVICE);
38 n_descs += nfp_nfdk_headlen_to_segs(size);
39 txbuf++;
40
41 frag = skb_shinfo(skb)->frags;
42 fend = frag + nr_frags;
43 for (; frag < fend; frag++) {
44 size = skb_frag_size(frag);
45 dma_unmap_page(dev, txbuf->dma_addr,
46 skb_frag_size(frag), DMA_TO_DEVICE);
47 n_descs += DIV_ROUND_UP(size,
48 NFDK_TX_MAX_DATA_PER_DESC);
49 txbuf++;
50 }
51
52 if (skb_is_gso(skb))
53 n_descs++;
54
55 dev_kfree_skb_any(skb);
56 next:
57 tx_ring->rd_p += n_descs;
58 }
59
60 memset(tx_ring->txds, 0, tx_ring->size);
61 tx_ring->data_pending = 0;
62 tx_ring->wr_p = 0;
63 tx_ring->rd_p = 0;
64 tx_ring->qcp_rd_p = 0;
65 tx_ring->wr_ptr_add = 0;
66
67 if (tx_ring->is_xdp || !dp->netdev)
68 return;
69
70 nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx);
71 netdev_tx_reset_queue(nd_q);
72 }
73
nfp_nfdk_tx_ring_free(struct nfp_net_tx_ring * tx_ring)74 static void nfp_nfdk_tx_ring_free(struct nfp_net_tx_ring *tx_ring)
75 {
76 struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
77 struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
78
79 kvfree(tx_ring->ktxbufs);
80
81 if (tx_ring->ktxds)
82 dma_free_coherent(dp->dev, tx_ring->size,
83 tx_ring->ktxds, tx_ring->dma);
84
85 tx_ring->cnt = 0;
86 tx_ring->txbufs = NULL;
87 tx_ring->txds = NULL;
88 tx_ring->dma = 0;
89 tx_ring->size = 0;
90 }
91
92 static int
nfp_nfdk_tx_ring_alloc(struct nfp_net_dp * dp,struct nfp_net_tx_ring * tx_ring)93 nfp_nfdk_tx_ring_alloc(struct nfp_net_dp *dp, struct nfp_net_tx_ring *tx_ring)
94 {
95 struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
96
97 tx_ring->cnt = dp->txd_cnt * NFDK_TX_DESC_PER_SIMPLE_PKT;
98 tx_ring->size = array_size(tx_ring->cnt, sizeof(*tx_ring->ktxds));
99 tx_ring->ktxds = dma_alloc_coherent(dp->dev, tx_ring->size,
100 &tx_ring->dma,
101 GFP_KERNEL | __GFP_NOWARN);
102 if (!tx_ring->ktxds) {
103 netdev_warn(dp->netdev, "failed to allocate TX descriptor ring memory, requested descriptor count: %d, consider lowering descriptor count\n",
104 tx_ring->cnt);
105 goto err_alloc;
106 }
107
108 tx_ring->ktxbufs = kvcalloc(tx_ring->cnt, sizeof(*tx_ring->ktxbufs),
109 GFP_KERNEL);
110 if (!tx_ring->ktxbufs)
111 goto err_alloc;
112
113 if (!tx_ring->is_xdp && dp->netdev)
114 netif_set_xps_queue(dp->netdev, &r_vec->affinity_mask,
115 tx_ring->idx);
116
117 return 0;
118
119 err_alloc:
120 nfp_nfdk_tx_ring_free(tx_ring);
121 return -ENOMEM;
122 }
123
124 static void
nfp_nfdk_tx_ring_bufs_free(struct nfp_net_dp * dp,struct nfp_net_tx_ring * tx_ring)125 nfp_nfdk_tx_ring_bufs_free(struct nfp_net_dp *dp,
126 struct nfp_net_tx_ring *tx_ring)
127 {
128 }
129
130 static int
nfp_nfdk_tx_ring_bufs_alloc(struct nfp_net_dp * dp,struct nfp_net_tx_ring * tx_ring)131 nfp_nfdk_tx_ring_bufs_alloc(struct nfp_net_dp *dp,
132 struct nfp_net_tx_ring *tx_ring)
133 {
134 return 0;
135 }
136
137 static void
nfp_nfdk_print_tx_descs(struct seq_file * file,struct nfp_net_r_vector * r_vec,struct nfp_net_tx_ring * tx_ring,u32 d_rd_p,u32 d_wr_p)138 nfp_nfdk_print_tx_descs(struct seq_file *file,
139 struct nfp_net_r_vector *r_vec,
140 struct nfp_net_tx_ring *tx_ring,
141 u32 d_rd_p, u32 d_wr_p)
142 {
143 struct nfp_nfdk_tx_desc *txd;
144 u32 txd_cnt = tx_ring->cnt;
145 int i;
146
147 for (i = 0; i < txd_cnt; i++) {
148 txd = &tx_ring->ktxds[i];
149
150 seq_printf(file, "%04d: 0x%08x 0x%08x 0x%016llx", i,
151 txd->vals[0], txd->vals[1], tx_ring->ktxbufs[i].raw);
152
153 if (i == tx_ring->rd_p % txd_cnt)
154 seq_puts(file, " H_RD");
155 if (i == tx_ring->wr_p % txd_cnt)
156 seq_puts(file, " H_WR");
157 if (i == d_rd_p % txd_cnt)
158 seq_puts(file, " D_RD");
159 if (i == d_wr_p % txd_cnt)
160 seq_puts(file, " D_WR");
161
162 seq_putc(file, '\n');
163 }
164 }
165
166 #define NFP_NFDK_CFG_CTRL_SUPPORTED \
167 (NFP_NET_CFG_CTRL_ENABLE | NFP_NET_CFG_CTRL_PROMISC | \
168 NFP_NET_CFG_CTRL_L2BC | NFP_NET_CFG_CTRL_L2MC | \
169 NFP_NET_CFG_CTRL_RXCSUM | NFP_NET_CFG_CTRL_TXCSUM | \
170 NFP_NET_CFG_CTRL_RXVLAN | \
171 NFP_NET_CFG_CTRL_RXVLAN_V2 | NFP_NET_CFG_CTRL_RXQINQ | \
172 NFP_NET_CFG_CTRL_TXVLAN_V2 | \
173 NFP_NET_CFG_CTRL_GATHER | NFP_NET_CFG_CTRL_LSO | \
174 NFP_NET_CFG_CTRL_CTAG_FILTER | NFP_NET_CFG_CTRL_CMSG_DATA | \
175 NFP_NET_CFG_CTRL_RINGCFG | NFP_NET_CFG_CTRL_IRQMOD | \
176 NFP_NET_CFG_CTRL_TXRWB | NFP_NET_CFG_CTRL_VEPA | \
177 NFP_NET_CFG_CTRL_VXLAN | NFP_NET_CFG_CTRL_NVGRE | \
178 NFP_NET_CFG_CTRL_BPF | NFP_NET_CFG_CTRL_LSO2 | \
179 NFP_NET_CFG_CTRL_RSS2 | NFP_NET_CFG_CTRL_CSUM_COMPLETE | \
180 NFP_NET_CFG_CTRL_LIVE_ADDR)
181
182 const struct nfp_dp_ops nfp_nfdk_ops = {
183 .version = NFP_NFD_VER_NFDK,
184 .tx_min_desc_per_pkt = NFDK_TX_DESC_PER_SIMPLE_PKT,
185 .cap_mask = NFP_NFDK_CFG_CTRL_SUPPORTED,
186 .dma_mask = DMA_BIT_MASK(48),
187 .poll = nfp_nfdk_poll,
188 .ctrl_poll = nfp_nfdk_ctrl_poll,
189 .xmit = nfp_nfdk_tx,
190 .ctrl_tx_one = nfp_nfdk_ctrl_tx_one,
191 .rx_ring_fill_freelist = nfp_nfdk_rx_ring_fill_freelist,
192 .tx_ring_alloc = nfp_nfdk_tx_ring_alloc,
193 .tx_ring_reset = nfp_nfdk_tx_ring_reset,
194 .tx_ring_free = nfp_nfdk_tx_ring_free,
195 .tx_ring_bufs_alloc = nfp_nfdk_tx_ring_bufs_alloc,
196 .tx_ring_bufs_free = nfp_nfdk_tx_ring_bufs_free,
197 .print_tx_descs = nfp_nfdk_print_tx_descs
198 };
199