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Subject[PATCH][next] qed/qed_ll2: Replace one-element array with flexible-array member
There is a regular need in the kernel to provide a way to declare having
a dynamically sized set of trailing elements in a structure. Kernel code
should always use “flexible array members”[1] for these cases. The older
style of one-element or zero-length arrays should no longer be used[2].

Refactor the code according to the use of a flexible-array member in
struct qed_ll2_tx_packet, instead of a one-element array and use the
struct_size() helper to calculate the size for the allocations. Commit
f5823fe6897c ("qed: Add ll2 option to limit the number of bds per packet")
was used as a reference point for these changes.

Also, it's important to notice that flexible-array members should occur
last in any structure, and structures containing such arrays and that
are members of other structures, must also occur last in the containing
structure. That's why _cur_completing_packet_ is now moved to the bottom
in struct qed_ll2_tx_queue. _descq_mem_ and _cur_send_packet_ are also
moved for unification.

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.9-rc1/process/deprecated.html#zero-length-and-one-element-arrays

Tested-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/lkml/5f707198.PA1UCZ8MYozYZYAR%25lkp@intel.com/
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
drivers/net/ethernet/qlogic/qed/qed_ll2.c | 18 ++++++++----------
drivers/net/ethernet/qlogic/qed/qed_ll2.h | 8 ++++----
2 files changed, 12 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_ll2.c b/drivers/net/ethernet/qlogic/qed/qed_ll2.c
index 0452b728c527..49783f365079 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_ll2.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_ll2.c
@@ -1185,7 +1185,7 @@ static int qed_ll2_acquire_connection_tx(struct qed_hwfn *p_hwfn,
.elem_size = sizeof(struct core_tx_bd),
};
struct qed_ll2_tx_packet *p_descq;
- u32 desc_size;
+ size_t desc_size;
u32 capacity;
int rc = 0;

@@ -1198,10 +1198,9 @@ static int qed_ll2_acquire_connection_tx(struct qed_hwfn *p_hwfn,
goto out;

capacity = qed_chain_get_capacity(&p_ll2_info->tx_queue.txq_chain);
- /* First element is part of the packet, rest are flexibly added */
- desc_size = (sizeof(*p_descq) +
- (p_ll2_info->input.tx_max_bds_per_packet - 1) *
- sizeof(p_descq->bds_set));
+ /* All bds_set elements are flexibily added. */
+ desc_size = struct_size(p_descq, bds_set,
+ p_ll2_info->input.tx_max_bds_per_packet);

p_descq = kcalloc(capacity, desc_size, GFP_KERNEL);
if (!p_descq) {
@@ -1524,7 +1523,7 @@ int qed_ll2_establish_connection(void *cxt, u8 connection_handle)
struct qed_ptt *p_ptt;
int rc = -EINVAL;
u32 i, capacity;
- u32 desc_size;
+ size_t desc_size;
u8 qid;

p_ptt = qed_ptt_acquire(p_hwfn);
@@ -1558,10 +1557,9 @@ int qed_ll2_establish_connection(void *cxt, u8 connection_handle)
INIT_LIST_HEAD(&p_tx->sending_descq);
spin_lock_init(&p_tx->lock);
capacity = qed_chain_get_capacity(&p_tx->txq_chain);
- /* First element is part of the packet, rest are flexibly added */
- desc_size = (sizeof(*p_pkt) +
- (p_ll2_conn->input.tx_max_bds_per_packet - 1) *
- sizeof(p_pkt->bds_set));
+ /* All bds_set elements are flexibily added. */
+ desc_size = struct_size(p_pkt, bds_set,
+ p_ll2_conn->input.tx_max_bds_per_packet);

for (i = 0; i < capacity; i++) {
p_pkt = p_tx->descq_mem + desc_size * i;
diff --git a/drivers/net/ethernet/qlogic/qed/qed_ll2.h b/drivers/net/ethernet/qlogic/qed/qed_ll2.h
index 500d0c4f8077..df88d00053a2 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_ll2.h
+++ b/drivers/net/ethernet/qlogic/qed/qed_ll2.h
@@ -56,7 +56,7 @@ struct qed_ll2_tx_packet {
struct core_tx_bd *txq_bd;
dma_addr_t tx_frag;
u16 frag_len;
- } bds_set[1];
+ } bds_set[];
};

struct qed_ll2_rx_queue {
@@ -86,9 +86,6 @@ struct qed_ll2_tx_queue {
struct list_head active_descq;
struct list_head free_descq;
struct list_head sending_descq;
- void *descq_mem; /* memory for variable sized qed_ll2_tx_packet*/
- struct qed_ll2_tx_packet *cur_send_packet;
- struct qed_ll2_tx_packet cur_completing_packet;
u16 cur_completing_bd_idx;
void __iomem *doorbell_addr;
struct core_db_data db_msg;
@@ -96,6 +93,9 @@ struct qed_ll2_tx_queue {
u16 cur_send_frag_num;
u16 cur_completing_frag_num;
bool b_completing_packet;
+ void *descq_mem; /* memory for variable sized qed_ll2_tx_packet*/
+ struct qed_ll2_tx_packet *cur_send_packet;
+ struct qed_ll2_tx_packet cur_completing_packet;
};

struct qed_ll2_info {
--
2.27.0
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