From a248384e6420ebda63f788d33fac1c0a081e57a8 Mon Sep 17 00:00:00 2001
From: Varun Prakash <varun@chelsio.com>
Date: Mon, 10 Jun 2019 18:36:34 +0530
Subject: cxgb4/libcxgb/cxgb4i/cxgbit: enable eDRAM page pods for iSCSI

Page pods are used for direct data placement, this patch
enables eDRAM page pods if firmware supports this feature.

Signed-off-by: Varun Prakash <varun@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/ethernet/chelsio/libcxgb/libcxgb_ppm.c | 47 ++++++++++++++++++----
 drivers/net/ethernet/chelsio/libcxgb/libcxgb_ppm.h |  7 ++--
 2 files changed, 43 insertions(+), 11 deletions(-)

(limited to 'drivers/net/ethernet/chelsio/libcxgb')

diff --git a/drivers/net/ethernet/chelsio/libcxgb/libcxgb_ppm.c b/drivers/net/ethernet/chelsio/libcxgb/libcxgb_ppm.c
index e2919005ead3..21034536c9c5 100644
--- a/drivers/net/ethernet/chelsio/libcxgb/libcxgb_ppm.c
+++ b/drivers/net/ethernet/chelsio/libcxgb/libcxgb_ppm.c
@@ -123,6 +123,9 @@ static int ppm_get_cpu_entries(struct cxgbi_ppm *ppm, unsigned int count,
 	unsigned int cpu;
 	int i;
 
+	if (!ppm->pool)
+		return -EINVAL;
+
 	cpu = get_cpu();
 	pool = per_cpu_ptr(ppm->pool, cpu);
 	spin_lock_bh(&pool->lock);
@@ -169,7 +172,9 @@ static int ppm_get_entries(struct cxgbi_ppm *ppm, unsigned int count,
 	}
 
 	ppm->next = i + count;
-	if (ppm->next >= ppm->bmap_index_max)
+	if (ppm->max_index_in_edram && (ppm->next >= ppm->max_index_in_edram))
+		ppm->next = 0;
+	else if (ppm->next >= ppm->bmap_index_max)
 		ppm->next = 0;
 
 	spin_unlock_bh(&ppm->map_lock);
@@ -382,18 +387,36 @@ static struct cxgbi_ppm_pool *ppm_alloc_cpu_pool(unsigned int *total,
 
 int cxgbi_ppm_init(void **ppm_pp, struct net_device *ndev,
 		   struct pci_dev *pdev, void *lldev,
-		   struct cxgbi_tag_format *tformat,
-		   unsigned int ppmax,
-		   unsigned int llimit,
-		   unsigned int start,
-		   unsigned int reserve_factor)
+		   struct cxgbi_tag_format *tformat, unsigned int iscsi_size,
+		   unsigned int llimit, unsigned int start,
+		   unsigned int reserve_factor, unsigned int iscsi_edram_start,
+		   unsigned int iscsi_edram_size)
 {
 	struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
 	struct cxgbi_ppm_pool *pool = NULL;
-	unsigned int ppmax_pool = 0;
 	unsigned int pool_index_max = 0;
-	unsigned int alloc_sz;
+	unsigned int ppmax_pool = 0;
 	unsigned int ppod_bmap_size;
+	unsigned int alloc_sz;
+	unsigned int ppmax;
+
+	if (!iscsi_edram_start)
+		iscsi_edram_size = 0;
+
+	if (iscsi_edram_size &&
+	    ((iscsi_edram_start + iscsi_edram_size) != start)) {
+		pr_err("iscsi ppod region not contiguous: EDRAM start 0x%x "
+			"size 0x%x DDR start 0x%x\n",
+			iscsi_edram_start, iscsi_edram_size, start);
+		return -EINVAL;
+	}
+
+	if (iscsi_edram_size) {
+		reserve_factor = 0;
+		start = iscsi_edram_start;
+	}
+
+	ppmax = (iscsi_edram_size + iscsi_size) >> PPOD_SIZE_SHIFT;
 
 	if (ppm) {
 		pr_info("ippm: %s, ppm 0x%p,0x%p already initialized, %u/%u.\n",
@@ -434,6 +457,14 @@ int cxgbi_ppm_init(void **ppm_pp, struct net_device *ndev,
 			__func__, ppmax, ppmax_pool, ppod_bmap_size, start,
 			end);
 	}
+	if (iscsi_edram_size) {
+		unsigned int first_ddr_idx =
+				iscsi_edram_size >> PPOD_SIZE_SHIFT;
+
+		ppm->max_index_in_edram = first_ddr_idx - 1;
+		bitmap_set(ppm->ppod_bmap, first_ddr_idx, 1);
+		pr_debug("reserved %u ppod in bitmap\n", first_ddr_idx);
+	}
 
 	spin_lock_init(&ppm->map_lock);
 	kref_init(&ppm->refcnt);
diff --git a/drivers/net/ethernet/chelsio/libcxgb/libcxgb_ppm.h b/drivers/net/ethernet/chelsio/libcxgb/libcxgb_ppm.h
index a91ad766cef0..7b02c200dd1e 100644
--- a/drivers/net/ethernet/chelsio/libcxgb/libcxgb_ppm.h
+++ b/drivers/net/ethernet/chelsio/libcxgb/libcxgb_ppm.h
@@ -143,6 +143,7 @@ struct cxgbi_ppm {
 	spinlock_t map_lock;		/* ppm map lock */
 	unsigned int bmap_index_max;
 	unsigned int next;
+	unsigned int max_index_in_edram;
 	unsigned long *ppod_bmap;
 	struct cxgbi_ppod_data ppod_data[0];
 };
@@ -324,9 +325,9 @@ int cxgbi_ppm_ppods_reserve(struct cxgbi_ppm *, unsigned short nr_pages,
 			    unsigned long caller_data);
 int cxgbi_ppm_init(void **ppm_pp, struct net_device *, struct pci_dev *,
 		   void *lldev, struct cxgbi_tag_format *,
-		   unsigned int ppmax, unsigned int llimit,
-		   unsigned int start,
-		   unsigned int reserve_factor);
+		   unsigned int iscsi_size, unsigned int llimit,
+		   unsigned int start, unsigned int reserve_factor,
+		   unsigned int edram_start, unsigned int edram_size);
 int cxgbi_ppm_release(struct cxgbi_ppm *ppm);
 void cxgbi_tagmask_check(unsigned int tagmask, struct cxgbi_tag_format *);
 unsigned int cxgbi_tagmask_set(unsigned int ppmax);
-- 
cgit