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Message-Id: <1611118955-13146-1-git-send-email-sundeep.lkml@gmail.com>
Date: Wed, 20 Jan 2021 10:32:35 +0530
From: sundeep.lkml@...il.com
To: davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
haokexin@...il.com
Cc: gakula@...vell.com, hkelam@...vell.com,
Subbaraya Sundeep <sbhatta@...vell.com>,
Sunil Goutham <sgoutham@...vell.com>
Subject: [PATCH] Revert "octeontx2-pf: Use the napi_alloc_frag() to alloc the pool buffers"
From: Subbaraya Sundeep <sbhatta@...vell.com>
Octeontx2 hardware needs buffer pointers which are 128 byte
aligned. napi_alloc_frag() returns buffer pointers which are
not 128 byte aligned sometimes because if napi_alloc_skb() is
called when a packet is received then subsequent napi_alloc_frag()
returns buffer which is not 128 byte aligned and those buffers
cannot be issued to NPA hardware. Hence reverting this commit.
Signed-off-by: Subbaraya Sundeep <sbhatta@...vell.com>
Signed-off-by: Sunil Goutham <sgoutham@...vell.com>
---
.../ethernet/marvell/octeontx2/nic/otx2_common.c | 52 +++++++++++++---------
.../ethernet/marvell/octeontx2/nic/otx2_common.h | 15 ++++++-
.../net/ethernet/marvell/octeontx2/nic/otx2_txrx.c | 3 +-
.../net/ethernet/marvell/octeontx2/nic/otx2_txrx.h | 4 ++
4 files changed, 50 insertions(+), 24 deletions(-)
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
index bdfa2e2..921cd86 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
@@ -483,35 +483,40 @@ void otx2_config_irq_coalescing(struct otx2_nic *pfvf, int qidx)
(pfvf->hw.cq_ecount_wait - 1));
}
-dma_addr_t __otx2_alloc_rbuf(struct otx2_nic *pfvf, struct otx2_pool *pool)
+dma_addr_t otx2_alloc_rbuf(struct otx2_nic *pfvf, struct otx2_pool *pool,
+ gfp_t gfp)
{
dma_addr_t iova;
- u8 *buf;
- buf = napi_alloc_frag(pool->rbsize);
- if (unlikely(!buf))
+ /* Check if request can be accommodated in previous allocated page */
+ if (pool->page && ((pool->page_offset + pool->rbsize) <=
+ (PAGE_SIZE << pool->rbpage_order))) {
+ pool->pageref++;
+ goto ret;
+ }
+
+ otx2_get_page(pool);
+
+ /* Allocate a new page */
+ pool->page = alloc_pages(gfp | __GFP_COMP | __GFP_NOWARN,
+ pool->rbpage_order);
+ if (unlikely(!pool->page))
return -ENOMEM;
- iova = dma_map_single_attrs(pfvf->dev, buf, pool->rbsize,
- DMA_FROM_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);
- if (unlikely(dma_mapping_error(pfvf->dev, iova))) {
- page_frag_free(buf);
+ pool->page_offset = 0;
+ret:
+ iova = (u64)otx2_dma_map_page(pfvf, pool->page, pool->page_offset,
+ pool->rbsize, DMA_FROM_DEVICE);
+ if (!iova) {
+ if (!pool->page_offset)
+ __free_pages(pool->page, pool->rbpage_order);
+ pool->page = NULL;
return -ENOMEM;
}
-
+ pool->page_offset += pool->rbsize;
return iova;
}
-static dma_addr_t otx2_alloc_rbuf(struct otx2_nic *pfvf, struct otx2_pool *pool)
-{
- dma_addr_t addr;
-
- local_bh_disable();
- addr = __otx2_alloc_rbuf(pfvf, pool);
- local_bh_enable();
- return addr;
-}
-
void otx2_tx_timeout(struct net_device *netdev, unsigned int txq)
{
struct otx2_nic *pfvf = netdev_priv(netdev);
@@ -913,7 +918,7 @@ static void otx2_pool_refill_task(struct work_struct *work)
free_ptrs = cq->pool_ptrs;
while (cq->pool_ptrs) {
- bufptr = otx2_alloc_rbuf(pfvf, rbpool);
+ bufptr = otx2_alloc_rbuf(pfvf, rbpool, GFP_KERNEL);
if (bufptr <= 0) {
/* Schedule a WQ if we fails to free atleast half of the
* pointers else enable napi for this RQ.
@@ -1172,6 +1177,7 @@ static int otx2_pool_init(struct otx2_nic *pfvf, u16 pool_id,
return err;
pool->rbsize = buf_size;
+ pool->rbpage_order = get_order(buf_size);
/* Initialize this pool's context via AF */
aq = otx2_mbox_alloc_msg_npa_aq_enq(&pfvf->mbox);
@@ -1259,12 +1265,13 @@ int otx2_sq_aura_pool_init(struct otx2_nic *pfvf)
return -ENOMEM;
for (ptr = 0; ptr < num_sqbs; ptr++) {
- bufptr = otx2_alloc_rbuf(pfvf, pool);
+ bufptr = otx2_alloc_rbuf(pfvf, pool, GFP_KERNEL);
if (bufptr <= 0)
return bufptr;
otx2_aura_freeptr(pfvf, pool_id, bufptr);
sq->sqb_ptrs[sq->sqb_count++] = (u64)bufptr;
}
+ otx2_get_page(pool);
}
return 0;
@@ -1310,12 +1317,13 @@ int otx2_rq_aura_pool_init(struct otx2_nic *pfvf)
for (pool_id = 0; pool_id < hw->rqpool_cnt; pool_id++) {
pool = &pfvf->qset.pool[pool_id];
for (ptr = 0; ptr < num_ptrs; ptr++) {
- bufptr = otx2_alloc_rbuf(pfvf, pool);
+ bufptr = otx2_alloc_rbuf(pfvf, pool, GFP_KERNEL);
if (bufptr <= 0)
return bufptr;
otx2_aura_freeptr(pfvf, pool_id,
bufptr + OTX2_HEAD_ROOM);
}
+ otx2_get_page(pool);
}
return 0;
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
index 143ae04..f670da9 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
@@ -491,6 +491,18 @@ static inline void otx2_aura_freeptr(struct otx2_nic *pfvf,
otx2_get_regaddr(pfvf, NPA_LF_AURA_OP_FREE0));
}
+/* Update page ref count */
+static inline void otx2_get_page(struct otx2_pool *pool)
+{
+ if (!pool->page)
+ return;
+
+ if (pool->pageref)
+ page_ref_add(pool->page, pool->pageref);
+ pool->pageref = 0;
+ pool->page = NULL;
+}
+
static inline int otx2_get_pool_idx(struct otx2_nic *pfvf, int type, int idx)
{
if (type == AURA_NIX_SQ)
@@ -636,7 +648,8 @@ int otx2_txschq_config(struct otx2_nic *pfvf, int lvl);
int otx2_txsch_alloc(struct otx2_nic *pfvf);
int otx2_txschq_stop(struct otx2_nic *pfvf);
void otx2_sqb_flush(struct otx2_nic *pfvf);
-dma_addr_t __otx2_alloc_rbuf(struct otx2_nic *pfvf, struct otx2_pool *pool);
+dma_addr_t otx2_alloc_rbuf(struct otx2_nic *pfvf, struct otx2_pool *pool,
+ gfp_t gfp);
int otx2_rxtx_enable(struct otx2_nic *pfvf, bool enable);
void otx2_ctx_disable(struct mbox *mbox, int type, bool npa);
int otx2_nix_config_bp(struct otx2_nic *pfvf, bool enable);
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c
index d0e2541..7774d9a 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c
@@ -333,7 +333,7 @@ static int otx2_rx_napi_handler(struct otx2_nic *pfvf,
/* Refill pool with new buffers */
while (cq->pool_ptrs) {
- bufptr = __otx2_alloc_rbuf(pfvf, cq->rbpool);
+ bufptr = otx2_alloc_rbuf(pfvf, cq->rbpool, GFP_ATOMIC);
if (unlikely(bufptr <= 0)) {
struct refill_work *work;
struct delayed_work *dwork;
@@ -351,6 +351,7 @@ static int otx2_rx_napi_handler(struct otx2_nic *pfvf,
otx2_aura_freeptr(pfvf, cq->cq_idx, bufptr + OTX2_HEAD_ROOM);
cq->pool_ptrs--;
}
+ otx2_get_page(cq->rbpool);
return processed_cqe;
}
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.h b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.h
index 73af156..9cd20c7 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.h
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.h
@@ -114,7 +114,11 @@ struct otx2_cq_poll {
struct otx2_pool {
struct qmem *stack;
struct qmem *fc_addr;
+ u8 rbpage_order;
u16 rbsize;
+ u32 page_offset;
+ u16 pageref;
+ struct page *page;
};
struct otx2_cq_queue {
--
2.7.4
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