The CPSW CPDMA can process buffer descriptors placed as in internal
CPPI RAM as in DDR. This patch adds support in CPSW and CPDMA for
descs_pool_size mudule parameter, which defines total number of CPDMA CPPI
descriptors to be used for both ingress/egress packets processing:
- memory size, required for CPDMA descriptor pool, is calculated basing
on number of descriptors specified by user in descs_pool_size and
CPDMA descriptor size and allocated from coherent memory (CMA area);
- CPDMA descriptor pool will be allocated in DDR if pool memory size >
internal CPPI RAM or use internal CPPI RAM otherwise;
- if descs_pool_size not specified in DT - the default value 256 will
be used which will allow to place CPDMA descriptors pool into the
internal CPPI RAM (current default behaviour);
- CPDMA will ignore descs_pool_size if descs_pool_size = 0 for
backward comaptiobility with davinci_emac.
descs_pool_size is boot time setting and can't be changed once
CPSW/CPDMA is initialized.
Signed-off-by: Grygorii Strashko <grygorii.strashko@xxxxxx>
---
drivers/net/ethernet/ti/cpsw.c | 12 +++++++++---
drivers/net/ethernet/ti/davinci_cpdma.c | 12 ++++++++++++
drivers/net/ethernet/ti/davinci_cpdma.h | 1 +
3 files changed, 22 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index b203143..d39875e 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -145,6 +145,7 @@ do { \
cpsw->data.active_slave)
#define IRQ_NUM 2
#define CPSW_MAX_QUEUES 8
+#define CPSW_CPDMA_DESCS_POOL_SIZE_DEFAULT 256
static int debug_level;
module_param(debug_level, int, 0);
@@ -158,6 +159,10 @@ static int rx_packet_max = CPSW_MAX_PACKET_SIZE;
module_param(rx_packet_max, int, 0);
MODULE_PARM_DESC(rx_packet_max, "maximum receive packet size (bytes)");
+static int descs_pool_size = CPSW_CPDMA_DESCS_POOL_SIZE_DEFAULT;
+module_param(descs_pool_size, int, 0444);
+MODULE_PARM_DESC(descs_pool_size, "Number of CPDMA CPPI descriptors in pool");
+
struct cpsw_wr_regs {
u32 id_ver;
u32 soft_reset;
@@ -2969,6 +2974,7 @@ static int cpsw_probe(struct platform_device *pdev)
dma_params.has_ext_regs = true;
dma_params.desc_hw_addr = dma_params.desc_mem_phys;
dma_params.bus_freq_mhz = cpsw->bus_freq_mhz;
+ dma_params.descs_pool_size = descs_pool_size;
cpsw->dma = cpdma_ctlr_create(&dma_params);
if (!cpsw->dma) {
@@ -3072,9 +3078,9 @@ static int cpsw_probe(struct platform_device *pdev)
goto clean_ale_ret;
}
- cpsw_notice(priv, probe, "initialized device (regs %pa, irq %d)\n",
- &ss_res->start, ndev->irq);
-
+ cpsw_notice(priv, probe,
+ "initialized device (regs %pa, irq %d, pool size %d)\n",
+ &ss_res->start, ndev->irq, dma_params.descs_pool_size);
if (cpsw->data.dual_emac) {
ret = cpsw_probe_dual_emac(priv);
if (ret) {
diff --git a/drivers/net/ethernet/ti/davinci_cpdma.c b/drivers/net/ethernet/ti/davinci_cpdma.c
index b229bf3..65e2f12 100644
--- a/drivers/net/ethernet/ti/davinci_cpdma.c
+++ b/drivers/net/ethernet/ti/davinci_cpdma.c
@@ -219,6 +219,18 @@ int cpdma_desc_pool_create(struct cpdma_ctlr *ctlr)
cpdma_params->desc_align);
pool->num_desc = pool->mem_size / pool->desc_size;
+ if (cpdma_params->descs_pool_size) {
+ /* recalculate memory size required cpdma descriptor pool
+ * basing on number of descriptors specified by user and
+ * if memory size > CPPI internal RAM size (desc_mem_size)
+ * then switch to use DDR
+ */
+ pool->num_desc = cpdma_params->descs_pool_size;
+ pool->mem_size = pool->desc_size * pool->num_desc;
+ if (pool->mem_size > cpdma_params->desc_mem_size)
+ cpdma_params->desc_mem_phys = 0;
+ }
+
pool->gen_pool = devm_gen_pool_create(ctlr->dev, ilog2(pool->desc_size),
-1, "cpdma");
if (IS_ERR(pool->gen_pool)) {
diff --git a/drivers/net/ethernet/ti/davinci_cpdma.h b/drivers/net/ethernet/ti/davinci_cpdma.h
index 4a167db..cb45f8f 100644
--- a/drivers/net/ethernet/ti/davinci_cpdma.h
+++ b/drivers/net/ethernet/ti/davinci_cpdma.h
@@ -37,6 +37,7 @@ struct cpdma_params {
int desc_mem_size;
int desc_align;
u32 bus_freq_mhz;
+ u32 descs_pool_size;
/*
* Some instances of embedded cpdma controllers have extra control and
--
2.10.1.dirty
--
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