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Date: Mon, 30 Jan 2017 20:49:26 -0500
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org
Subject: [PATCH net-next 01/10] bnxt_en: Refactor rx SKB function.
Minor refactoring of bnxt_rx_skb() so that it can easily be replaced by
a new function that handles packets in a single page. Also, use a
function pointer bp->rx_skb_func() to switch to a new function when
we add the new mode in the next patch.
Add a new field data_ptr that points to the packet data in the
bnxt_sw_rx_bd structure. The original data field is changed to void
pointer so that it can either hold the kmalloc'ed data or a page
pointer.
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 42 ++++++++++++++++++++++---------
drivers/net/ethernet/broadcom/bnxt/bnxt.h | 11 ++++++--
2 files changed, 39 insertions(+), 14 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 3d83b90..d419199 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -607,6 +607,7 @@ static inline int bnxt_alloc_rx_data(struct bnxt *bp,
return -ENOMEM;
rx_buf->data = data;
+ rx_buf->data_ptr = data + BNXT_RX_OFFSET;
dma_unmap_addr_set(rx_buf, mapping, mapping);
rxbd->rx_bd_haddr = cpu_to_le64(mapping);
@@ -615,7 +616,7 @@ static inline int bnxt_alloc_rx_data(struct bnxt *bp,
}
static void bnxt_reuse_rx_data(struct bnxt_rx_ring_info *rxr, u16 cons,
- u8 *data)
+ void *data)
{
u16 prod = rxr->rx_prod;
struct bnxt_sw_rx_bd *cons_rx_buf, *prod_rx_buf;
@@ -625,6 +626,7 @@ static void bnxt_reuse_rx_data(struct bnxt_rx_ring_info *rxr, u16 cons,
cons_rx_buf = &rxr->rx_buf_ring[cons];
prod_rx_buf->data = data;
+ prod_rx_buf->data_ptr = cons_rx_buf->data_ptr;
dma_unmap_addr_set(prod_rx_buf, mapping,
dma_unmap_addr(cons_rx_buf, mapping));
@@ -755,7 +757,7 @@ static void bnxt_reuse_rx_agg_bufs(struct bnxt_napi *bnapi, u16 cp_cons,
static struct sk_buff *bnxt_rx_skb(struct bnxt *bp,
struct bnxt_rx_ring_info *rxr, u16 cons,
- u16 prod, u8 *data, dma_addr_t dma_addr,
+ u16 prod, void *data, dma_addr_t dma_addr,
unsigned int len)
{
int err;
@@ -776,7 +778,7 @@ static struct sk_buff *bnxt_rx_skb(struct bnxt *bp,
}
skb_reserve(skb, BNXT_RX_OFFSET);
- skb_put(skb, len);
+ skb_put(skb, len & 0xffff);
return skb;
}
@@ -878,7 +880,8 @@ static inline struct sk_buff *bnxt_copy_skb(struct bnxt_napi *bnapi, u8 *data,
dma_sync_single_for_cpu(&pdev->dev, mapping,
bp->rx_copy_thresh, PCI_DMA_FROMDEVICE);
- memcpy(skb->data - BNXT_RX_OFFSET, data, len + BNXT_RX_OFFSET);
+ memcpy(skb->data - NET_IP_ALIGN, data - NET_IP_ALIGN,
+ len + NET_IP_ALIGN);
dma_sync_single_for_device(&pdev->dev, mapping,
bp->rx_copy_thresh,
@@ -951,6 +954,7 @@ static void bnxt_tpa_start(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,
}
prod_rx_buf->data = tpa_info->data;
+ prod_rx_buf->data_ptr = tpa_info->data_ptr;
mapping = tpa_info->mapping;
dma_unmap_addr_set(prod_rx_buf, mapping, mapping);
@@ -960,6 +964,7 @@ static void bnxt_tpa_start(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,
prod_bd->rx_bd_haddr = cpu_to_le64(mapping);
tpa_info->data = cons_rx_buf->data;
+ tpa_info->data_ptr = cons_rx_buf->data_ptr;
cons_rx_buf->data = NULL;
tpa_info->mapping = dma_unmap_addr(cons_rx_buf, mapping);
@@ -1192,12 +1197,13 @@ static inline struct sk_buff *bnxt_tpa_end(struct bnxt *bp,
struct bnxt_cp_ring_info *cpr = &bnapi->cp_ring;
struct bnxt_rx_ring_info *rxr = bnapi->rx_ring;
u8 agg_id = TPA_END_AGG_ID(tpa_end);
- u8 *data, agg_bufs;
+ u8 *data_ptr, agg_bufs;
u16 cp_cons = RING_CMP(*raw_cons);
unsigned int len;
struct bnxt_tpa_info *tpa_info;
dma_addr_t mapping;
struct sk_buff *skb;
+ void *data;
if (unlikely(bnapi->in_reset)) {
int rc = bnxt_discard_rx(bp, bnapi, raw_cons, tpa_end);
@@ -1209,7 +1215,8 @@ static inline struct sk_buff *bnxt_tpa_end(struct bnxt *bp,
tpa_info = &rxr->rx_tpa[agg_id];
data = tpa_info->data;
- prefetch(data);
+ data_ptr = tpa_info->data_ptr;
+ prefetch(data_ptr);
len = tpa_info->len;
mapping = tpa_info->mapping;
@@ -1232,7 +1239,7 @@ static inline struct sk_buff *bnxt_tpa_end(struct bnxt *bp,
}
if (len <= bp->rx_copy_thresh) {
- skb = bnxt_copy_skb(bnapi, data, len, mapping);
+ skb = bnxt_copy_skb(bnapi, data_ptr, len, mapping);
if (!skb) {
bnxt_abort_tpa(bp, bnapi, cp_cons, agg_bufs);
return NULL;
@@ -1248,6 +1255,7 @@ static inline struct sk_buff *bnxt_tpa_end(struct bnxt *bp,
}
tpa_info->data = new_data;
+ tpa_info->data_ptr = new_data + BNXT_RX_OFFSET;
tpa_info->mapping = new_mapping;
skb = build_skb(data, 0);
@@ -1316,9 +1324,10 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_napi *bnapi, u32 *raw_cons,
u16 cons, prod, cp_cons = RING_CMP(tmp_raw_cons);
struct bnxt_sw_rx_bd *rx_buf;
unsigned int len;
- u8 *data, agg_bufs, cmp_type;
+ u8 *data_ptr, agg_bufs, cmp_type;
dma_addr_t dma_addr;
struct sk_buff *skb;
+ void *data;
int rc = 0;
rxcmp = (struct rx_cmp *)
@@ -1363,13 +1372,14 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_napi *bnapi, u32 *raw_cons,
cons = rxcmp->rx_cmp_opaque;
rx_buf = &rxr->rx_buf_ring[cons];
data = rx_buf->data;
+ data_ptr = rx_buf->data_ptr;
if (unlikely(cons != rxr->rx_next_cons)) {
int rc1 = bnxt_discard_rx(bp, bnapi, raw_cons, rxcmp);
bnxt_sched_reset(bp, rxr);
return rc1;
}
- prefetch(data);
+ prefetch(data_ptr);
agg_bufs = (le32_to_cpu(rxcmp->rx_cmp_misc_v1) & RX_CMP_AGG_BUFS) >>
RX_CMP_AGG_BUFS_SHIFT;
@@ -1396,14 +1406,14 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_napi *bnapi, u32 *raw_cons,
dma_addr = dma_unmap_addr(rx_buf, mapping);
if (len <= bp->rx_copy_thresh) {
- skb = bnxt_copy_skb(bnapi, data, len, dma_addr);
+ skb = bnxt_copy_skb(bnapi, data_ptr, len, dma_addr);
bnxt_reuse_rx_data(rxr, cons, data);
if (!skb) {
rc = -ENOMEM;
goto next_rx;
}
} else {
- skb = bnxt_rx_skb(bp, rxr, cons, prod, data, dma_addr, len);
+ skb = bp->rx_skb_func(bp, rxr, cons, prod, data, dma_addr, len);
if (!skb) {
rc = -ENOMEM;
goto next_rx;
@@ -1880,7 +1890,7 @@ static void bnxt_free_rx_skbs(struct bnxt *bp)
for (j = 0; j < max_idx; j++) {
struct bnxt_sw_rx_bd *rx_buf = &rxr->rx_buf_ring[j];
- u8 *data = rx_buf->data;
+ void *data = rx_buf->data;
if (!data)
continue;
@@ -2326,6 +2336,7 @@ static int bnxt_init_one_rx_ring(struct bnxt *bp, int ring_nr)
return -ENOMEM;
rxr->rx_tpa[i].data = data;
+ rxr->rx_tpa[i].data_ptr = data + BNXT_RX_OFFSET;
rxr->rx_tpa[i].mapping = mapping;
}
} else {
@@ -2550,6 +2561,12 @@ void bnxt_set_ring_params(struct bnxt *bp)
bp->cp_ring_mask = bp->cp_bit - 1;
}
+static int bnxt_set_rx_skb_mode(struct bnxt *bp)
+{
+ bp->rx_skb_func = bnxt_rx_skb;
+ return 0;
+}
+
static void bnxt_free_vnic_attributes(struct bnxt *bp)
{
int i;
@@ -7299,6 +7316,7 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
bnxt_hwrm_func_qcfg(bp);
bnxt_hwrm_port_led_qcaps(bp);
+ bnxt_set_rx_skb_mode(bp);
bnxt_set_tpa_flags(bp);
bnxt_set_ring_params(bp);
bnxt_set_max_func_irqs(bp, max_irqs);
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 52a1cc0..33302b0 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -516,7 +516,8 @@ struct bnxt_sw_tx_bd {
};
struct bnxt_sw_rx_bd {
- u8 *data;
+ void *data;
+ u8 *data_ptr;
DEFINE_DMA_UNMAP_ADDR(mapping);
};
@@ -576,7 +577,8 @@ struct bnxt_tx_ring_info {
};
struct bnxt_tpa_info {
- u8 *data;
+ void *data;
+ u8 *data_ptr;
dma_addr_t mapping;
u16 len;
unsigned short gso_type;
@@ -988,6 +990,11 @@ struct bnxt {
struct sk_buff * (*gro_func)(struct bnxt_tpa_info *, int, int,
struct sk_buff *);
+ struct sk_buff * (*rx_skb_func)(struct bnxt *,
+ struct bnxt_rx_ring_info *,
+ u16, u16, void *, dma_addr_t,
+ unsigned int);
+
u32 rx_buf_size;
u32 rx_buf_use_size; /* useable size */
u32 rx_ring_size;
--
1.8.3.1
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