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ionic: add tx/rx-push support with device Component Memory Buffers

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The ionic device has on-board memory (CMB) that can be used
for descriptors as a way to speed descriptor access for faster
packet processing.  It is rumored to improve latency and/or
packets-per-second for some profiles of small packet traffic,
although your mileage may vary.

Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Shannon Nelson
2023-02-10 16:50:17 -08:00
committed by David S. Miller
parent 5b4e9a7a71
commit 40bc471dc7
8 changed files with 404 additions and 21 deletions
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67
drivers/net/ethernet/pensando/ionic/ionic_dev.c
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@@ -92,6 +92,7 @@ int ionic_dev_setup(struct ionic *ionic)
unsigned int num_bars = ionic->num_bars;
struct ionic_dev *idev = &ionic->idev;
struct device *dev = ionic->dev;
int size;
u32 sig;
/* BAR0: dev_cmd and interrupts */
@@ -133,9 +134,36 @@ int ionic_dev_setup(struct ionic *ionic)
idev->db_pages = bar->vaddr;
idev->phy_db_pages = bar->bus_addr;
/* BAR2: optional controller memory mapping */
bar++;
mutex_init(&idev->cmb_inuse_lock);
if (num_bars < 3 || !ionic->bars[IONIC_PCI_BAR_CMB].len) {
idev->cmb_inuse = NULL;
return 0;
}
idev->phy_cmb_pages = bar->bus_addr;
idev->cmb_npages = bar->len / PAGE_SIZE;
size = BITS_TO_LONGS(idev->cmb_npages) * sizeof(long);
idev->cmb_inuse = kzalloc(size, GFP_KERNEL);
if (!idev->cmb_inuse)
dev_warn(dev, "No memory for CMB, disabling\n");
return 0;
}
void ionic_dev_teardown(struct ionic *ionic)
{
struct ionic_dev *idev = &ionic->idev;
kfree(idev->cmb_inuse);
idev->cmb_inuse = NULL;
idev->phy_cmb_pages = 0;
idev->cmb_npages = 0;
mutex_destroy(&idev->cmb_inuse_lock);
}
/* Devcmd Interface */
bool ionic_is_fw_running(struct ionic_dev *idev)
{
@@ -571,6 +599,33 @@ int ionic_db_page_num(struct ionic_lif *lif, int pid)
return (lif->hw_index * lif->dbid_count) + pid;
}
int ionic_get_cmb(struct ionic_lif *lif, u32 *pgid, phys_addr_t *pgaddr, int order)
{
struct ionic_dev *idev = &lif->ionic->idev;
int ret;
mutex_lock(&idev->cmb_inuse_lock);
ret = bitmap_find_free_region(idev->cmb_inuse, idev->cmb_npages, order);
mutex_unlock(&idev->cmb_inuse_lock);
if (ret < 0)
return ret;
*pgid = ret;
*pgaddr = idev->phy_cmb_pages + ret * PAGE_SIZE;
return 0;
}
void ionic_put_cmb(struct ionic_lif *lif, u32 pgid, int order)
{
struct ionic_dev *idev = &lif->ionic->idev;
mutex_lock(&idev->cmb_inuse_lock);
bitmap_release_region(idev->cmb_inuse, pgid, order);
mutex_unlock(&idev->cmb_inuse_lock);
}
int ionic_cq_init(struct ionic_lif *lif, struct ionic_cq *cq,
struct ionic_intr_info *intr,
unsigned int num_descs, size_t desc_size)
@@ -679,6 +734,18 @@ void ionic_q_map(struct ionic_queue *q, void *base, dma_addr_t base_pa)
cur->desc = base + (i * q->desc_size);
}
void ionic_q_cmb_map(struct ionic_queue *q, void __iomem *base, dma_addr_t base_pa)
{
struct ionic_desc_info *cur;
unsigned int i;
q->cmb_base = base;
q->cmb_base_pa = base_pa;
for (i = 0, cur = q->info; i < q->num_descs; i++, cur++)
cur->cmb_desc = base + (i * q->desc_size);
}
void ionic_q_sg_map(struct ionic_queue *q, void *base, dma_addr_t base_pa)
{
struct ionic_desc_info *cur;