port_buffer->buffer[i].lossy);
}
+ port_buffer->headroom_size = total_used;
port_buffer->port_buffer_size =
MLX5_GET(pbmc_reg, out, port_buffer_size) * port_buff_cell_sz;
port_buffer->spare_buffer_size =
return err;
}
+struct mlx5e_buffer_pool {
+ u32 infi_size;
+ u32 size;
+ u32 buff_occupancy;
+};
+
+static int mlx5e_port_query_pool(struct mlx5_core_dev *mdev,
+ struct mlx5e_buffer_pool *buffer_pool,
+ u32 desc, u8 dir, u8 pool_idx)
+{
+ u32 out[MLX5_ST_SZ_DW(sbpr_reg)] = {};
+ int err;
+
+ err = mlx5e_port_query_sbpr(mdev, desc, dir, pool_idx, out,
+ sizeof(out));
+ if (err)
+ return err;
+
+ buffer_pool->size = MLX5_GET(sbpr_reg, out, size);
+ buffer_pool->infi_size = MLX5_GET(sbpr_reg, out, infi_size);
+ buffer_pool->buff_occupancy = MLX5_GET(sbpr_reg, out, buff_occupancy);
+
+ return err;
+}
+
+enum {
+ MLX5_INGRESS_DIR = 0,
+ MLX5_EGRESS_DIR = 1,
+};
+
+enum {
+ MLX5_LOSSY_POOL = 0,
+ MLX5_LOSSLESS_POOL = 1,
+};
+
+/* No limit on usage of shared buffer pool (max_buff=0) */
+#define MLX5_SB_POOL_NO_THRESHOLD 0
+/* Shared buffer pool usage threshold when calculated
+ * dynamically in alpha units. alpha=13 is equivalent to
+ * HW_alpha of [(1/128) * 2 ^ (alpha-1)] = 32, where HW_alpha
+ * equates to the following portion of the shared buffer pool:
+ * [32 / (1 + n * 32)] While *n* is the number of buffers
+ * that are using the shared buffer pool.
+ */
+#define MLX5_SB_POOL_THRESHOLD 13
+
+/* Shared buffer class management parameters */
+struct mlx5_sbcm_params {
+ u8 pool_idx;
+ u8 max_buff;
+ u8 infi_size;
+};
+
+static const struct mlx5_sbcm_params sbcm_default = {
+ .pool_idx = MLX5_LOSSY_POOL,
+ .max_buff = MLX5_SB_POOL_NO_THRESHOLD,
+ .infi_size = 0,
+};
+
+static const struct mlx5_sbcm_params sbcm_lossy = {
+ .pool_idx = MLX5_LOSSY_POOL,
+ .max_buff = MLX5_SB_POOL_NO_THRESHOLD,
+ .infi_size = 1,
+};
+
+static const struct mlx5_sbcm_params sbcm_lossless = {
+ .pool_idx = MLX5_LOSSLESS_POOL,
+ .max_buff = MLX5_SB_POOL_THRESHOLD,
+ .infi_size = 0,
+};
+
+static const struct mlx5_sbcm_params sbcm_lossless_no_threshold = {
+ .pool_idx = MLX5_LOSSLESS_POOL,
+ .max_buff = MLX5_SB_POOL_NO_THRESHOLD,
+ .infi_size = 1,
+};
+
+/**
+ * select_sbcm_params() - selects the shared buffer pool configuration
+ *
+ * @buffer: <input> port buffer to retrieve params of
+ * @lossless_buff_count: <input> number of lossless buffers in total
+ *
+ * The selection is based on the following rules:
+ * 1. If buffer size is 0, no shared buffer pool is used.
+ * 2. If buffer is lossy, use lossy shared buffer pool.
+ * 3. If there are more than 1 lossless buffers, use lossless shared buffer pool
+ * with threshold.
+ * 4. If there is only 1 lossless buffer, use lossless shared buffer pool
+ * without threshold.
+ *
+ * @return const struct mlx5_sbcm_params* selected values
+ */
+static const struct mlx5_sbcm_params *
+select_sbcm_params(struct mlx5e_bufferx_reg *buffer, u8 lossless_buff_count)
+{
+ if (buffer->size == 0)
+ return &sbcm_default;
+
+ if (buffer->lossy)
+ return &sbcm_lossy;
+
+ if (lossless_buff_count > 1)
+ return &sbcm_lossless;
+
+ return &sbcm_lossless_no_threshold;
+}
+
+static int port_update_pool_cfg(struct mlx5_core_dev *mdev,
+ struct mlx5e_port_buffer *port_buffer)
+{
+ const struct mlx5_sbcm_params *p;
+ u8 lossless_buff_count = 0;
+ int err;
+ int i;
+
+ if (!MLX5_CAP_GEN(mdev, sbcam_reg))
+ return 0;
+
+ for (i = 0; i < MLX5E_MAX_BUFFER; i++)
+ lossless_buff_count += ((port_buffer->buffer[i].size) &&
+ (!(port_buffer->buffer[i].lossy)));
+
+ for (i = 0; i < MLX5E_MAX_BUFFER; i++) {
+ p = select_sbcm_params(&port_buffer->buffer[i], lossless_buff_count);
+ err = mlx5e_port_set_sbcm(mdev, 0, i,
+ MLX5_INGRESS_DIR,
+ p->infi_size,
+ p->max_buff,
+ p->pool_idx);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+static int port_update_shared_buffer(struct mlx5_core_dev *mdev,
+ u32 current_headroom_size,
+ u32 new_headroom_size)
+{
+ struct mlx5e_buffer_pool lossless_ipool;
+ struct mlx5e_buffer_pool lossy_epool;
+ u32 lossless_ipool_size;
+ u32 shared_buffer_size;
+ u32 total_buffer_size;
+ u32 lossy_epool_size;
+ int err;
+
+ if (!MLX5_CAP_GEN(mdev, sbcam_reg))
+ return 0;
+
+ err = mlx5e_port_query_pool(mdev, &lossy_epool, 0, MLX5_EGRESS_DIR,
+ MLX5_LOSSY_POOL);
+ if (err)
+ return err;
+
+ err = mlx5e_port_query_pool(mdev, &lossless_ipool, 0, MLX5_INGRESS_DIR,
+ MLX5_LOSSLESS_POOL);
+ if (err)
+ return err;
+
+ total_buffer_size = current_headroom_size + lossy_epool.size +
+ lossless_ipool.size;
+ shared_buffer_size = total_buffer_size - new_headroom_size;
+
+ if (shared_buffer_size < 4) {
+ pr_err("Requested port buffer is too large, not enough space left for shared buffer\n");
+ return -EINVAL;
+ }
+
+ /* Total shared buffer size is split in a ratio of 3:1 between
+ * lossy and lossless pools respectively.
+ */
+ lossy_epool_size = (shared_buffer_size / 4) * 3;
+ lossless_ipool_size = shared_buffer_size / 4;
+
+ mlx5e_port_set_sbpr(mdev, 0, MLX5_EGRESS_DIR, MLX5_LOSSY_POOL, 0,
+ lossy_epool_size);
+ mlx5e_port_set_sbpr(mdev, 0, MLX5_INGRESS_DIR, MLX5_LOSSLESS_POOL, 0,
+ lossless_ipool_size);
+ return 0;
+}
+
static int port_set_buffer(struct mlx5e_priv *priv,
struct mlx5e_port_buffer *port_buffer)
{
u16 port_buff_cell_sz = priv->dcbx.port_buff_cell_sz;
struct mlx5_core_dev *mdev = priv->mdev;
int sz = MLX5_ST_SZ_BYTES(pbmc_reg);
+ u32 new_headroom_size = 0;
+ u32 current_headroom_size;
void *in;
int err;
int i;
+ current_headroom_size = port_buffer->headroom_size;
+
in = kzalloc(sz, GFP_KERNEL);
if (!in)
return -ENOMEM;
u64 xoff = port_buffer->buffer[i].xoff;
u64 xon = port_buffer->buffer[i].xon;
+ new_headroom_size += size;
do_div(size, port_buff_cell_sz);
do_div(xoff, port_buff_cell_sz);
do_div(xon, port_buff_cell_sz);
MLX5_SET(bufferx_reg, buffer, xon_threshold, xon);
}
+ new_headroom_size /= port_buff_cell_sz;
+ current_headroom_size /= port_buff_cell_sz;
+ err = port_update_shared_buffer(priv->mdev, current_headroom_size,
+ new_headroom_size);
+ if (err)
+ return err;
+
+ err = port_update_pool_cfg(priv->mdev, port_buffer);
+ if (err)
+ return err;
+
err = mlx5e_port_set_pbmc(mdev, in);
out:
kfree(in);
/**
* update_buffer_lossy - Update buffer configuration based on pfc
+ * @mdev: port function core device
* @max_mtu: netdev's max_mtu
* @pfc_en: <input> current pfc configuration
* @buffer: <input> current prio to buffer mapping
* @return: 0 if no error,
* sets change to true if buffer configuration was modified.
*/
-static int update_buffer_lossy(unsigned int max_mtu,
+static int update_buffer_lossy(struct mlx5_core_dev *mdev,
+ unsigned int max_mtu,
u8 pfc_en, u8 *buffer, u32 xoff, u16 port_buff_cell_sz,
struct mlx5e_port_buffer *port_buffer,
bool *change)
}
if (changed) {
+ err = port_update_pool_cfg(mdev, port_buffer);
+ if (err)
+ return err;
+
err = update_xoff_threshold(port_buffer, xoff, max_mtu, port_buff_cell_sz);
if (err)
return err;
}
if (change & MLX5E_PORT_BUFFER_PFC) {
+ mlx5e_dbg(HW, priv, "%s: requested PFC per priority bitmask: 0x%x\n",
+ __func__, pfc->pfc_en);
err = mlx5e_port_query_priority2buffer(priv->mdev, buffer);
if (err)
return err;
- err = update_buffer_lossy(max_mtu, pfc->pfc_en, buffer, xoff, port_buff_cell_sz,
- &port_buffer, &update_buffer);
+ err = update_buffer_lossy(priv->mdev, max_mtu, pfc->pfc_en, buffer, xoff,
+ port_buff_cell_sz, &port_buffer,
+ &update_buffer);
if (err)
return err;
}
if (change & MLX5E_PORT_BUFFER_PRIO2BUFFER) {
update_prio2buffer = true;
+ for (i = 0; i < MLX5E_MAX_BUFFER; i++)
+ mlx5e_dbg(HW, priv, "%s: requested to map prio[%d] to buffer %d\n",
+ __func__, i, prio2buffer[i]);
+
err = fill_pfc_en(priv->mdev, &curr_pfc_en);
if (err)
return err;
- err = update_buffer_lossy(max_mtu, curr_pfc_en, prio2buffer, xoff,
+ err = update_buffer_lossy(priv->mdev, max_mtu, curr_pfc_en, prio2buffer, xoff,
port_buff_cell_sz, &port_buffer, &update_buffer);
if (err)
return err;
projects / platform / kernel / linux-starfive.git / commitdiff