drivers/net/ethernet/mscc/ocelot_police.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/mscc/ocelot_police.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/mscc/ocelot_police.c
Extension
.c
Size
6699 bytes
Lines
255
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (conf->mode == MSCC_QOS_RATE_MODE_LINE) {
			frm_mode = POL_MODE_LINERATE;
			ipg = min_t(u8, GENMASK(4, 0), conf->ipg);
		} else {
			frm_mode = POL_MODE_DATARATE;
		}
		if (conf->dlb) {
			cir_ena = 1;
			cir = conf->cir;
			cbs = conf->cbs;
			if (cir == 0 && cbs == 0) {
				/* Discard cir frames */
				cir_discard = 1;
			} else {
				cir = DIV_ROUND_UP(cir, 100);
				cir *= 3; /* 33 1/3 kbps */
				cbs = DIV_ROUND_UP(cbs, 4096);
				cbs = (cbs ? cbs : 1); /* No zero burst size */
				cbs_max = 60; /* Limit burst size */
				cf = conf->cf;
				if (cf)
					pir += conf->cir;
			}
		}
		if (pir == 0 && pbs == 0) {
			/* Discard PIR frames */
			pir_discard = 1;
		} else {
			pir = DIV_ROUND_UP(pir, 100);
			pir *= 3;  /* 33 1/3 kbps */
			pbs = DIV_ROUND_UP(pbs, 4096);
			pbs = (pbs ? pbs : 1); /* No zero burst size */
			pbs_max = 60; /* Limit burst size */
		}
		break;
	case MSCC_QOS_RATE_MODE_FRAME:
		if (pir >= 100) {
			frm_mode = POL_MODE_FRMRATE_HI;
			pir = DIV_ROUND_UP(pir, 100);
			pir *= 3;  /* 33 1/3 fps */
			pbs = (pbs * 10) / 328; /* 32.8 frames */
			pbs = (pbs ? pbs : 1); /* No zero burst size */
			pbs_max = GENMASK(6, 0); /* Limit burst size */
		} else {
			frm_mode = POL_MODE_FRMRATE_LO;
			if (pir == 0 && pbs == 0) {
				/* Discard all frames */
				pir_discard = 1;
				cir_discard = 1;
			} else {
				pir *= 3; /* 1/3 fps */
				pbs = (pbs * 10) / 3; /* 0.3 frames */
				pbs = (pbs ? pbs : 1); /* No zero burst size */
				pbs_max = 61; /* Limit burst size */
			}
		}
		break;
	default: /* MSCC_QOS_RATE_MODE_DISABLED */
		/* Disable policer using maximum rate and zero burst */
		pir = GENMASK(15, 0);
		pbs = 0;
		break;
	}

	/* Check limits */
	if (pir > GENMASK(15, 0)) {
		dev_err(ocelot->dev,
			"Invalid pir for policer %u: %u (max %lu)\n",
			pol_ix, pir, GENMASK(15, 0));
		return -EINVAL;
	}

	if (cir > GENMASK(15, 0)) {
		dev_err(ocelot->dev,
			"Invalid cir for policer %u: %u (max %lu)\n",
			pol_ix, cir, GENMASK(15, 0));
		return -EINVAL;
	}

	if (pbs > pbs_max) {
		dev_err(ocelot->dev,
			"Invalid pbs for policer %u: %u (max %u)\n",
			pol_ix, pbs, pbs_max);
		return -EINVAL;
	}

	if (cbs > cbs_max) {
		dev_err(ocelot->dev,
			"Invalid cbs for policer %u: %u (max %u)\n",
			pol_ix, cbs, cbs_max);

Annotation

Implementation Notes