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Date: Sat, 23 Dec 2023 03:55:39 +0100
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: Alexander Lobakin <aleksander.lobakin@...el.com>,
Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
Michal Kubiak <michal.kubiak@...el.com>,
Larysa Zaremba <larysa.zaremba@...el.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Willem de Bruijn <willemdebruijn.kernel@...il.com>,
intel-wired-lan@...ts.osuosl.org,
netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH RFC net-next 19/34] idpf: stop using macros for accessing queue descriptors
In C, we have structures and unions.
Casting `void *` via macros is not only error-prone, but also looks
confusing and awful in general.
Replace it with a union and direct array dereferences. Had idpf had
separate queue structures, it would look way more elegant -- will do
one day.
Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>
---
.../ethernet/intel/idpf/idpf_singleq_txrx.c | 20 +++++-----
drivers/net/ethernet/intel/idpf/idpf_txrx.c | 30 +++++++--------
drivers/net/ethernet/intel/idpf/idpf_txrx.h | 37 ++++++++-----------
3 files changed, 40 insertions(+), 47 deletions(-)
diff --git a/drivers/net/ethernet/intel/idpf/idpf_singleq_txrx.c b/drivers/net/ethernet/intel/idpf/idpf_singleq_txrx.c
index 23dcc02e6976..7072d45f007b 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_singleq_txrx.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_singleq_txrx.c
@@ -206,7 +206,7 @@ static void idpf_tx_singleq_map(struct idpf_queue *tx_q,
data_len = skb->data_len;
size = skb_headlen(skb);
- tx_desc = IDPF_BASE_TX_DESC(tx_q, i);
+ tx_desc = &tx_q->base_tx[i];
dma = dma_map_single(tx_q->dev, skb->data, size, DMA_TO_DEVICE);
@@ -242,7 +242,7 @@ static void idpf_tx_singleq_map(struct idpf_queue *tx_q,
i++;
if (i == tx_q->desc_count) {
- tx_desc = IDPF_BASE_TX_DESC(tx_q, 0);
+ tx_desc = &tx_q->base_tx[0];
i = 0;
}
@@ -262,7 +262,7 @@ static void idpf_tx_singleq_map(struct idpf_queue *tx_q,
i++;
if (i == tx_q->desc_count) {
- tx_desc = IDPF_BASE_TX_DESC(tx_q, 0);
+ tx_desc = &tx_q->base_tx[0];
i = 0;
}
@@ -311,7 +311,7 @@ idpf_tx_singleq_get_ctx_desc(struct idpf_queue *txq)
memset(&txq->tx_buf[ntu], 0, sizeof(struct idpf_tx_buf));
txq->tx_buf[ntu].ctx_entry = true;
- ctx_desc = IDPF_BASE_TX_CTX_DESC(txq, ntu);
+ ctx_desc = &txq->base_ctx[ntu];
IDPF_SINGLEQ_BUMP_RING_IDX(txq, ntu);
txq->next_to_use = ntu;
@@ -460,7 +460,7 @@ static bool idpf_tx_singleq_clean(struct idpf_queue *tx_q, int napi_budget,
struct netdev_queue *nq;
bool dont_wake;
- tx_desc = IDPF_BASE_TX_DESC(tx_q, ntc);
+ tx_desc = &tx_q->base_tx[ntc];
tx_buf = &tx_q->tx_buf[ntc];
ntc -= tx_q->desc_count;
@@ -509,7 +509,7 @@ static bool idpf_tx_singleq_clean(struct idpf_queue *tx_q, int napi_budget,
if (unlikely(!ntc)) {
ntc -= tx_q->desc_count;
tx_buf = tx_q->tx_buf;
- tx_desc = IDPF_BASE_TX_DESC(tx_q, 0);
+ tx_desc = &tx_q->base_tx[0];
}
/* unmap any remaining paged data */
@@ -527,7 +527,7 @@ static bool idpf_tx_singleq_clean(struct idpf_queue *tx_q, int napi_budget,
if (unlikely(!ntc)) {
ntc -= tx_q->desc_count;
tx_buf = tx_q->tx_buf;
- tx_desc = IDPF_BASE_TX_DESC(tx_q, 0);
+ tx_desc = &tx_q->base_tx[0];
}
} while (likely(budget));
@@ -880,7 +880,7 @@ bool idpf_rx_singleq_buf_hw_alloc_all(struct idpf_queue *rx_q,
if (!cleaned_count)
return false;
- desc = IDPF_SINGLEQ_RX_BUF_DESC(rx_q, nta);
+ desc = &rx_q->single_buf[nta];
do {
dma_addr_t addr;
@@ -898,7 +898,7 @@ bool idpf_rx_singleq_buf_hw_alloc_all(struct idpf_queue *rx_q,
nta++;
if (unlikely(nta == rx_q->desc_count)) {
- desc = IDPF_SINGLEQ_RX_BUF_DESC(rx_q, 0);
+ desc = &rx_q->single_buf[0];
nta = 0;
}
@@ -998,7 +998,7 @@ static int idpf_rx_singleq_clean(struct idpf_queue *rx_q, int budget)
struct idpf_rx_buf *rx_buf;
/* get the Rx desc from Rx queue based on 'next_to_clean' */
- rx_desc = IDPF_RX_DESC(rx_q, ntc);
+ rx_desc = &rx_q->rx[ntc];
/* status_error_ptype_len will always be zero for unused
* descriptors because it's cleared in cleanup, and overlaps
diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.c b/drivers/net/ethernet/intel/idpf/idpf_txrx.c
index 6fd9128e61d8..40b8d8b17827 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_txrx.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.c
@@ -533,7 +533,7 @@ static bool idpf_rx_post_buf_desc(struct idpf_queue *bufq, u16 buf_id)
u16 nta = bufq->next_to_alloc;
dma_addr_t addr;
- splitq_rx_desc = IDPF_SPLITQ_RX_BUF_DESC(bufq, nta);
+ splitq_rx_desc = &bufq->split_buf[nta];
if (bufq->rx_hsplit_en) {
bq.pp = bufq->hdr_pp;
@@ -1560,7 +1560,7 @@ do { \
if (unlikely(!(ntc))) { \
ntc -= (txq)->desc_count; \
buf = (txq)->tx_buf; \
- desc = IDPF_FLEX_TX_DESC(txq, 0); \
+ desc = &(txq)->flex_tx[0]; \
} else { \
(buf)++; \
(desc)++; \
@@ -1593,8 +1593,8 @@ static void idpf_tx_splitq_clean(struct idpf_queue *tx_q, u16 end,
s16 ntc = tx_q->next_to_clean;
struct idpf_tx_buf *tx_buf;
- tx_desc = IDPF_FLEX_TX_DESC(tx_q, ntc);
- next_pending_desc = IDPF_FLEX_TX_DESC(tx_q, end);
+ tx_desc = &tx_q->flex_tx[ntc];
+ next_pending_desc = &tx_q->flex_tx[end];
tx_buf = &tx_q->tx_buf[ntc];
ntc -= tx_q->desc_count;
@@ -1774,7 +1774,7 @@ static bool idpf_tx_clean_complq(struct idpf_queue *complq, int budget,
int i;
complq_budget = vport->compln_clean_budget;
- tx_desc = IDPF_SPLITQ_TX_COMPLQ_DESC(complq, ntc);
+ tx_desc = &complq->comp[ntc];
ntc -= complq->desc_count;
do {
@@ -1840,7 +1840,7 @@ static bool idpf_tx_clean_complq(struct idpf_queue *complq, int budget,
ntc++;
if (unlikely(!ntc)) {
ntc -= complq->desc_count;
- tx_desc = IDPF_SPLITQ_TX_COMPLQ_DESC(complq, 0);
+ tx_desc = &complq->comp[0];
change_bit(__IDPF_Q_GEN_CHK, complq->flags);
}
@@ -2107,7 +2107,7 @@ void idpf_tx_dma_map_error(struct idpf_queue *txq, struct sk_buff *skb,
* used one additional descriptor for a context
* descriptor. Reset that here.
*/
- tx_desc = IDPF_FLEX_TX_DESC(txq, idx);
+ tx_desc = &txq->flex_tx[idx];
memset(tx_desc, 0, sizeof(struct idpf_flex_tx_ctx_desc));
if (idx == 0)
idx = txq->desc_count;
@@ -2167,7 +2167,7 @@ static void idpf_tx_splitq_map(struct idpf_queue *tx_q,
data_len = skb->data_len;
size = skb_headlen(skb);
- tx_desc = IDPF_FLEX_TX_DESC(tx_q, i);
+ tx_desc = &tx_q->flex_tx[i];
dma = dma_map_single(tx_q->dev, skb->data, size, DMA_TO_DEVICE);
@@ -2241,7 +2241,7 @@ static void idpf_tx_splitq_map(struct idpf_queue *tx_q,
i++;
if (i == tx_q->desc_count) {
- tx_desc = IDPF_FLEX_TX_DESC(tx_q, 0);
+ tx_desc = &tx_q->flex_tx[0];
i = 0;
tx_q->compl_tag_cur_gen =
IDPF_TX_ADJ_COMPL_TAG_GEN(tx_q);
@@ -2286,7 +2286,7 @@ static void idpf_tx_splitq_map(struct idpf_queue *tx_q,
i++;
if (i == tx_q->desc_count) {
- tx_desc = IDPF_FLEX_TX_DESC(tx_q, 0);
+ tx_desc = &tx_q->flex_tx[0];
i = 0;
tx_q->compl_tag_cur_gen = IDPF_TX_ADJ_COMPL_TAG_GEN(tx_q);
}
@@ -2520,7 +2520,7 @@ idpf_tx_splitq_get_ctx_desc(struct idpf_queue *txq)
txq->tx_buf[i].compl_tag = IDPF_SPLITQ_TX_INVAL_COMPL_TAG;
/* grab the next descriptor */
- desc = IDPF_FLEX_TX_CTX_DESC(txq, i);
+ desc = &txq->flex_ctx[i];
txq->next_to_use = idpf_tx_splitq_bump_ntu(txq, i);
return desc;
@@ -3020,7 +3020,7 @@ static int idpf_rx_splitq_clean(struct idpf_queue *rxq, int budget)
u8 rxdid;
/* get the Rx desc from Rx queue based on 'next_to_clean' */
- desc = IDPF_RX_DESC(rxq, ntc);
+ desc = &rxq->rx[ntc];
rx_desc = (struct virtchnl2_rx_flex_desc_adv_nic_3 *)desc;
/* This memory barrier is needed to keep us from reading
@@ -3225,11 +3225,11 @@ static void idpf_rx_clean_refillq(struct idpf_queue *bufq,
int cleaned = 0;
u16 gen;
- buf_desc = IDPF_SPLITQ_RX_BUF_DESC(bufq, bufq_nta);
+ buf_desc = &bufq->split_buf[bufq_nta];
/* make sure we stop at ring wrap in the unlikely case ring is full */
while (likely(cleaned < refillq->desc_count)) {
- u16 refill_desc = IDPF_SPLITQ_RX_BI_DESC(refillq, ntc);
+ u16 refill_desc = refillq->ring[ntc];
bool failure;
gen = FIELD_GET(IDPF_RX_BI_GEN_M, refill_desc);
@@ -3247,7 +3247,7 @@ static void idpf_rx_clean_refillq(struct idpf_queue *bufq,
}
if (unlikely(++bufq_nta == bufq->desc_count)) {
- buf_desc = IDPF_SPLITQ_RX_BUF_DESC(bufq, 0);
+ buf_desc = &bufq->split_buf[0];
bufq_nta = 0;
} else {
buf_desc++;
diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.h b/drivers/net/ethernet/intel/idpf/idpf_txrx.h
index 5975c6d029d7..2584bd94363f 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_txrx.h
+++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.h
@@ -112,24 +112,6 @@ do { \
#define IDPF_RXD_EOF_SPLITQ VIRTCHNL2_RX_FLEX_DESC_ADV_STATUS0_EOF_M
#define IDPF_RXD_EOF_SINGLEQ VIRTCHNL2_RX_BASE_DESC_STATUS_EOF_M
-#define IDPF_SINGLEQ_RX_BUF_DESC(rxq, i) \
- (&(((struct virtchnl2_singleq_rx_buf_desc *)((rxq)->desc_ring))[i]))
-#define IDPF_SPLITQ_RX_BUF_DESC(rxq, i) \
- (&(((struct virtchnl2_splitq_rx_buf_desc *)((rxq)->desc_ring))[i]))
-#define IDPF_SPLITQ_RX_BI_DESC(rxq, i) ((((rxq)->ring))[i])
-
-#define IDPF_BASE_TX_DESC(txq, i) \
- (&(((struct idpf_base_tx_desc *)((txq)->desc_ring))[i]))
-#define IDPF_BASE_TX_CTX_DESC(txq, i) \
- (&(((struct idpf_base_tx_ctx_desc *)((txq)->desc_ring))[i]))
-#define IDPF_SPLITQ_TX_COMPLQ_DESC(txcq, i) \
- (&(((struct idpf_splitq_tx_compl_desc *)((txcq)->desc_ring))[i]))
-
-#define IDPF_FLEX_TX_DESC(txq, i) \
- (&(((union idpf_tx_flex_desc *)((txq)->desc_ring))[i]))
-#define IDPF_FLEX_TX_CTX_DESC(txq, i) \
- (&(((struct idpf_flex_tx_ctx_desc *)((txq)->desc_ring))[i]))
-
#define IDPF_DESC_UNUSED(txq) \
((((txq)->next_to_clean > (txq)->next_to_use) ? 0 : (txq)->desc_count) + \
(txq)->next_to_clean - (txq)->next_to_use - 1)
@@ -275,9 +257,6 @@ struct idpf_rx_extracted {
#define IDPF_TX_MAX_DESC_DATA_ALIGNED \
ALIGN_DOWN(IDPF_TX_MAX_DESC_DATA, IDPF_TX_MAX_READ_REQ_SIZE)
-#define IDPF_RX_DESC(rxq, i) \
- (&(((union virtchnl2_rx_desc *)((rxq)->desc_ring))[i]))
-
#define idpf_rx_buf libie_rx_buffer
#define IDPF_RX_MAX_PTYPE_PROTO_IDS 32
@@ -586,7 +565,21 @@ struct idpf_queue {
struct page_pool *pp;
struct device *dev;
};
- void *desc_ring;
+ union {
+ union virtchnl2_rx_desc *rx;
+
+ struct virtchnl2_singleq_rx_buf_desc *single_buf;
+ struct virtchnl2_splitq_rx_buf_desc *split_buf;
+
+ struct idpf_base_tx_desc *base_tx;
+ struct idpf_base_tx_ctx_desc *base_ctx;
+ union idpf_tx_flex_desc *flex_tx;
+ struct idpf_flex_tx_ctx_desc *flex_ctx;
+
+ struct idpf_splitq_tx_compl_desc *comp;
+
+ void *desc_ring;
+ };
u32 hdr_truesize;
u32 truesize;
--
2.43.0
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