Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/mlx5/mlx5_en/mlx5_en_port_buffer.c
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1 /*- 2 * Copyright (c) 2018-2019 Mellanox Technologies. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 * $FreeBSD$ 26 */ 27 28 #include "opt_rss.h" 29 #include "opt_ratelimit.h" 30 31 #include <dev/mlx5/mlx5_en/port_buffer.h> 32 33 #define MLX5E_MAX_PORT_MTU 9216 34 35 int mlx5e_port_query_buffer(struct mlx5e_priv *priv, 36 struct mlx5e_port_buffer *port_buffer) 37 { 38 struct mlx5_core_dev *mdev = priv->mdev; 39 int sz = MLX5_ST_SZ_BYTES(pbmc_reg); 40 u32 total_used = 0; 41 void *buffer; 42 void *out; 43 int err; 44 int i; 45 46 out = kzalloc(sz, GFP_KERNEL); 47 if (!out) 48 return -ENOMEM; 49 50 err = mlx5e_port_query_pbmc(mdev, out); 51 if (err) 52 goto out; 53 54 for (i = 0; i < MLX5E_MAX_BUFFER; i++) { 55 buffer = MLX5_ADDR_OF(pbmc_reg, out, buffer[i]); 56 port_buffer->buffer[i].lossy = 57 MLX5_GET(bufferx_reg, buffer, lossy); 58 port_buffer->buffer[i].epsb = 59 MLX5_GET(bufferx_reg, buffer, epsb); 60 port_buffer->buffer[i].size = 61 MLX5_GET(bufferx_reg, buffer, size) << MLX5E_BUFFER_CELL_SHIFT; 62 port_buffer->buffer[i].xon = 63 MLX5_GET(bufferx_reg, buffer, xon_threshold) << MLX5E_BUFFER_CELL_SHIFT; 64 port_buffer->buffer[i].xoff = 65 MLX5_GET(bufferx_reg, buffer, xoff_threshold) << MLX5E_BUFFER_CELL_SHIFT; 66 total_used += port_buffer->buffer[i].size; 67 68 mlx5e_dbg(HW, priv, "buffer %d: size=%d, xon=%d, xoff=%d, epsb=%d, lossy=%d\n", i, 69 port_buffer->buffer[i].size, 70 port_buffer->buffer[i].xon, 71 port_buffer->buffer[i].xoff, 72 port_buffer->buffer[i].epsb, 73 port_buffer->buffer[i].lossy); 74 } 75 76 port_buffer->port_buffer_size = 77 MLX5_GET(pbmc_reg, out, port_buffer_size) << MLX5E_BUFFER_CELL_SHIFT; 78 port_buffer->spare_buffer_size = 79 port_buffer->port_buffer_size - total_used; 80 81 mlx5e_dbg(HW, priv, "total buffer size=%d, spare buffer size=%d\n", 82 port_buffer->port_buffer_size, 83 port_buffer->spare_buffer_size); 84 out: 85 kfree(out); 86 return err; 87 } 88 89 static int port_set_buffer(struct mlx5e_priv *priv, 90 struct mlx5e_port_buffer *port_buffer) 91 { 92 struct mlx5_core_dev *mdev = priv->mdev; 93 int sz = MLX5_ST_SZ_BYTES(pbmc_reg); 94 void *buffer; 95 void *in; 96 int err; 97 int i; 98 99 in = kzalloc(sz, GFP_KERNEL); 100 if (!in) 101 return -ENOMEM; 102 103 err = mlx5e_port_query_pbmc(mdev, in); 104 if (err) 105 goto out; 106 107 for (i = 0; i < MLX5E_MAX_BUFFER; i++) { 108 buffer = MLX5_ADDR_OF(pbmc_reg, in, buffer[i]); 109 110 MLX5_SET(bufferx_reg, buffer, size, 111 port_buffer->buffer[i].size >> MLX5E_BUFFER_CELL_SHIFT); 112 MLX5_SET(bufferx_reg, buffer, lossy, 113 port_buffer->buffer[i].lossy); 114 MLX5_SET(bufferx_reg, buffer, xoff_threshold, 115 port_buffer->buffer[i].xoff >> MLX5E_BUFFER_CELL_SHIFT); 116 MLX5_SET(bufferx_reg, buffer, xon_threshold, 117 port_buffer->buffer[i].xon >> MLX5E_BUFFER_CELL_SHIFT); 118 } 119 120 err = mlx5e_port_set_pbmc(mdev, in); 121 out: 122 kfree(in); 123 return err; 124 } 125 126 /* xoff = ((301+2.16 * len [m]) * speed [Gbps] + 2.72 MTU [B]) */ 127 static u32 calculate_xoff(struct mlx5e_priv *priv, unsigned int mtu) 128 { 129 u32 speed; 130 u32 xoff; 131 int err; 132 133 err = mlx5e_port_linkspeed(priv->mdev, &speed); 134 if (err) { 135 mlx5_core_warn(priv->mdev, "cannot get port speed\n"); 136 speed = SPEED_40000; 137 } 138 speed = max_t(u32, speed, SPEED_40000); 139 xoff = (301 + 216 * priv->dcbx.cable_len / 100) * speed / 1000 + 272 * mtu / 100; 140 141 mlx5e_dbg(HW, priv, "%s: xoff=%d\n", __func__, xoff); 142 return xoff; 143 } 144 145 static int update_xoff_threshold(struct mlx5e_priv *priv, 146 struct mlx5e_port_buffer *port_buffer, u32 xoff) 147 { 148 int i; 149 150 for (i = 0; i < MLX5E_MAX_BUFFER; i++) { 151 if (port_buffer->buffer[i].lossy) { 152 port_buffer->buffer[i].xoff = 0; 153 port_buffer->buffer[i].xon = 0; 154 continue; 155 } 156 157 if (port_buffer->buffer[i].size < 158 (xoff + MLX5E_MAX_PORT_MTU + (1 << MLX5E_BUFFER_CELL_SHIFT))) { 159 mlx5_en_info(priv->ifp, 160 "non-lossy buffer %d size %d less than xoff threshold %d\n", 161 i, port_buffer->buffer[i].size, 162 xoff + MLX5E_MAX_PORT_MTU + 163 (1 << MLX5E_BUFFER_CELL_SHIFT)); 164 return -ENOMEM; 165 } 166 167 port_buffer->buffer[i].xoff = port_buffer->buffer[i].size - xoff; 168 port_buffer->buffer[i].xon = 169 port_buffer->buffer[i].xoff - MLX5E_MAX_PORT_MTU; 170 } 171 172 return 0; 173 } 174 175 /** 176 * update_buffer_lossy() 177 * mtu: device's MTU 178 * pfc_en: <input> current pfc configuration 179 * buffer: <input> current prio to buffer mapping 180 * xoff: <input> xoff value 181 * port_buffer: <output> port receive buffer configuration 182 * change: <output> 183 * 184 * Update buffer configuration based on pfc configuration and priority 185 * to buffer mapping. 186 * Buffer's lossy bit is changed to: 187 * lossless if there is at least one PFC enabled priority mapped to this buffer 188 * lossy if all priorities mapped to this buffer are PFC disabled 189 * 190 * Return: 191 * Return 0 if no error. 192 * Set change to true if buffer configuration is modified. 193 */ 194 static int update_buffer_lossy(struct mlx5e_priv *priv, unsigned int mtu, 195 u8 pfc_en, u8 *buffer, u32 xoff, 196 struct mlx5e_port_buffer *port_buffer, 197 bool *change) 198 { 199 bool changed = false; 200 u8 lossy_count; 201 u8 prio_count; 202 u8 lossy; 203 int prio; 204 int err; 205 int i; 206 207 for (i = 0; i < MLX5E_MAX_BUFFER; i++) { 208 prio_count = 0; 209 lossy_count = 0; 210 211 for (prio = 0; prio < MLX5E_MAX_PRIORITY; prio++) { 212 if (buffer[prio] != i) 213 continue; 214 215 prio_count++; 216 lossy_count += !(pfc_en & (1 << prio)); 217 } 218 219 if (lossy_count == prio_count) 220 lossy = 1; 221 else /* lossy_count < prio_count */ 222 lossy = 0; 223 224 if (lossy != port_buffer->buffer[i].lossy) { 225 port_buffer->buffer[i].lossy = lossy; 226 changed = true; 227 } 228 } 229 230 if (changed) { 231 err = update_xoff_threshold(priv, port_buffer, xoff); 232 if (err) 233 return err; 234 235 *change = true; 236 } 237 238 return 0; 239 } 240 241 int mlx5e_port_manual_buffer_config(struct mlx5e_priv *priv, 242 u32 change, unsigned int mtu, 243 struct ieee_pfc *pfc, 244 u32 *buffer_size, 245 u8 *prio2buffer) 246 { 247 struct mlx5e_port_buffer port_buffer; 248 u32 xoff = calculate_xoff(priv, mtu); 249 bool update_prio2buffer = false; 250 u8 buffer[MLX5E_MAX_PRIORITY]; 251 bool update_buffer = false; 252 u32 total_used = 0; 253 u8 curr_pfc_en; 254 int err; 255 int i; 256 257 mlx5e_dbg(HW, priv, "%s: change=%x\n", __func__, change); 258 259 err = mlx5e_port_query_buffer(priv, &port_buffer); 260 if (err) 261 return err; 262 263 if (change & MLX5E_PORT_BUFFER_CABLE_LEN) { 264 update_buffer = true; 265 err = update_xoff_threshold(priv, &port_buffer, xoff); 266 if (err) 267 return err; 268 } 269 270 if (change & MLX5E_PORT_BUFFER_PFC) { 271 err = mlx5e_port_query_priority2buffer(priv->mdev, buffer); 272 if (err) 273 return err; 274 275 priv->sw_is_port_buf_owner = true; 276 err = update_buffer_lossy(priv, mtu, pfc->pfc_en, buffer, xoff, 277 &port_buffer, &update_buffer); 278 if (err) 279 return err; 280 } 281 282 if (change & MLX5E_PORT_BUFFER_PRIO2BUFFER) { 283 update_prio2buffer = true; 284 err = mlx5_query_port_pfc(priv->mdev, &curr_pfc_en, NULL); 285 if (err) 286 return err; 287 288 err = update_buffer_lossy(priv, mtu, curr_pfc_en, prio2buffer, xoff, 289 &port_buffer, &update_buffer); 290 if (err) 291 return err; 292 } 293 294 if (change & MLX5E_PORT_BUFFER_SIZE) { 295 for (i = 0; i < MLX5E_MAX_BUFFER; i++) { 296 mlx5e_dbg(HW, priv, "%s: buffer[%d]=%d\n", __func__, i, buffer_size[i]); 297 if (!port_buffer.buffer[i].lossy && !buffer_size[i]) { 298 mlx5e_dbg(HW, priv, "%s: lossless buffer[%d] size cannot be zero\n", 299 __func__, i); 300 return -EINVAL; 301 } 302 303 port_buffer.buffer[i].size = buffer_size[i]; 304 total_used += buffer_size[i]; 305 } 306 307 mlx5e_dbg(HW, priv, "%s: total buffer requested=%d\n", __func__, total_used); 308 309 if (total_used > port_buffer.port_buffer_size) 310 return -EINVAL; 311 312 update_buffer = true; 313 err = update_xoff_threshold(priv, &port_buffer, xoff); 314 if (err) 315 return err; 316 } 317 318 /* Need to update buffer configuration if xoff value is changed */ 319 if (!update_buffer && xoff != priv->dcbx.xoff) { 320 update_buffer = true; 321 err = update_xoff_threshold(priv, &port_buffer, xoff); 322 if (err) 323 return err; 324 } 325 priv->dcbx.xoff = xoff; 326 327 /* Apply the settings */ 328 if (update_buffer) { 329 priv->sw_is_port_buf_owner = true; 330 err = port_set_buffer(priv, &port_buffer); 331 if (err) 332 return err; 333 } 334 335 if (update_prio2buffer) { 336 priv->sw_is_port_buf_owner = true; 337 err = mlx5e_port_set_priority2buffer(priv->mdev, prio2buffer); 338 } 339 340 return err; 341 }
Cache object: 3e4ea905e5e13e0799e1bc9c3feb05c3
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