linux-kernel - [PATCH net-next v4] octeon_ep: assert hardware structure sizes

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Date:   Fri, 20 Oct 2023 04:43:01 -0700
From:   Shinas Rasheed <srasheed@...vell.com>
To:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <hgani@...vell.com>, <vimleshk@...vell.com>, <egallen@...hat.com>,
        <mschmidt@...hat.com>, <pabeni@...hat.com>, <horms@...nel.org>,
        <kuba@...nel.org>, <davem@...emloft.net>,
        Shinas Rasheed <srasheed@...vell.com>,
        Veerasenareddy Burru <vburru@...vell.com>,
        "Sathesh Edara" <sedara@...vell.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next v4] octeon_ep: assert hardware structure sizes

Clean up structure defines related to hardware data to be
asserted to fixed sizes, as padding is not allowed
by hardware.

Signed-off-by: Shinas Rasheed <srasheed@...vell.com>
---
V4:
  - Changed packed attributes to static assertions for fixed sizes
V3: https://lore.kernel.org/all/20231016092051.2306831-1-srasheed@marvell.com/
  - Updated changelog to indicate this is a cleanup
V2: https://lore.kernel.org/all/20231010194026.2284786-1-srasheed@marvell.com/
  - Updated changelog to provide more information
V1: https://lore.kernel.org/all/20231006120225.2259533-1-srasheed@marvell.com/

 drivers/net/ethernet/marvell/octeon_ep/octep_rx.h | 3 +++
 drivers/net/ethernet/marvell/octeon_ep/octep_tx.h | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_rx.h b/drivers/net/ethernet/marvell/octeon_ep/octep_rx.h
index 782a24f27f3e..49feae80d7d2 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_rx.h
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_rx.h
@@ -20,6 +20,7 @@ struct octep_oq_desc_hw {
 	dma_addr_t buffer_ptr;
 	u64 info_ptr;
 };
+static_assert(sizeof(struct octep_oq_desc_hw) == 16);
 
 #define OCTEP_OQ_DESC_SIZE    (sizeof(struct octep_oq_desc_hw))
 
@@ -39,6 +40,7 @@ struct octep_oq_resp_hw_ext {
 	/* checksum verified. */
 	u64 csum_verified:2;
 };
+static_assert(sizeof(struct octep_oq_resp_hw_ext) == 8);
 
 #define  OCTEP_OQ_RESP_HW_EXT_SIZE   (sizeof(struct octep_oq_resp_hw_ext))
 
@@ -50,6 +52,7 @@ struct octep_oq_resp_hw {
 	/* The Length of the packet. */
 	__be64 length;
 };
+static_assert(sizeof(struct octep_oq_resp_hw) == 8);
 
 #define OCTEP_OQ_RESP_HW_SIZE   (sizeof(struct octep_oq_resp_hw))
 
diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_tx.h b/drivers/net/ethernet/marvell/octeon_ep/octep_tx.h
index 21e75ff9f5e7..86c98b13fc44 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_tx.h
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_tx.h
@@ -36,6 +36,7 @@ struct octep_tx_sglist_desc {
 	u16 len[4];
 	dma_addr_t dma_ptr[4];
 };
+static_assert(sizeof(struct octep_tx_sglist_desc) == 40);
 
 /* Each Scatter/Gather entry sent to hardwar hold four pointers.
  * So, number of entries required is (MAX_SKB_FRAGS + 1)/4, where '+1'
@@ -239,6 +240,7 @@ struct octep_instr_hdr {
 	/* Reserved3 */
 	u64 reserved3:1;
 };
+static_assert(sizeof(struct octep_instr_hdr) == 8);
 
 /* Hardware Tx completion response header */
 struct octep_instr_resp_hdr {
@@ -263,6 +265,7 @@ struct octep_instr_resp_hdr {
 	/* Opcode for the return packet  */
 	u64 opcode:16;
 };
+static_assert(sizeof(struct octep_instr_hdr) == 8);
 
 /* 64-byte Tx instruction format.
  * Format of instruction for a 64-byte mode input queue.
@@ -293,6 +296,7 @@ struct octep_tx_desc_hw {
 	/* Additional headers available in a 64-byte instruction. */
 	u64 exhdr[4];
 };
+static_assert(sizeof(struct octep_tx_desc_hw) == 64);
 
 #define OCTEP_IQ_DESC_SIZE (sizeof(struct octep_tx_desc_hw))
 #endif /* _OCTEP_TX_H_ */
-- 
2.25.1