common/cpt: fix build with GCC 12

[ upstream commit 3aa1682 ]

The following warning is observed with GCC 12 compilation:

In function ‘fill_sg_comp_from_iov’,
    inlined from ‘cpt_zuc_snow3g_enc_prep’ at
        ../drivers/common/cpt/cpt_ucode.h:1672:9,
    inlined from ‘cpt_fc_enc_hmac_prep’ at
        ../drivers/common/cpt/cpt_ucode.h:2472:3,
    inlined from ‘fill_digest_params’ at
        ../drivers/common/cpt/cpt_ucode.h:3548:14,
    inlined from ‘otx_cpt_enq_single_sym’ at
        ../drivers/crypto/octeontx/otx_cryptodev_ops.c:541:9,
    inlined from ‘otx_cpt_enq_single_sym_sessless’ at
        ../drivers/crypto/octeontx/otx_cryptodev_ops.c:584:8,
    inlined from ‘otx_cpt_enq_single’ at
        ../drivers/crypto/octeontx/otx_cryptodev_ops.c:611:11,
    inlined from ‘otx_cpt_pkt_enqueue’ at
        ../drivers/crypto/octeontx/otx_cryptodev_ops.c:643:9,
    inlined from ‘otx_cpt_enqueue_sym’ at
        ../drivers/crypto/octeontx/otx_cryptodev_ops.c:668:9:
../drivers/common/cpt/cpt_ucode.h:415:36: warning: array subscript 0 is
outside array bounds of ‘buf_ptr_t[0]’ {aka ‘struct buf_ptr[]’}
[-Warray-bounds]
  415 |                         e_dma_addr = bufs[j].dma_addr;
      |                         ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
../drivers/common/cpt/cpt_ucode.h:416:48: warning: array subscript 0 is
outside array bounds of ‘buf_ptr_t[0]’ {aka ‘struct buf_ptr[]’}
[-Warray-bounds]
  416 |                         e_len = (size > bufs[j].size) ?
      |                                         ~~~~~~~^~~~~

This patch resolves the warning.

Bugzilla ID: 861
Fixes: 9be415d ("common/cpt: add common defines for microcode")
Fixes: b74652f ("common/cpt: add microcode interface for encryption")

Signed-off-by: Ankur Dwivedi <adwivedi@marvell.com>
Reviewed-by: Anoob Joseph <anoobj@marvell.com>
Reviewed-by: Jerin Jacob <jerinj@marvell.com>
Tested-by: David Marchand <david.marchand@redhat.com>

drivers/common/cpt/cpt_mcode_defines.h

@@ -366,7 +366,7 @@ typedef struct buf_ptr {
 /* IOV Pointer */
 typedef struct{
 	int buf_cnt;
-	buf_ptr_t bufs[0];
+	buf_ptr_t bufs[];
 } iov_ptr_t;
 
 typedef struct fc_params {

drivers/common/cpt/cpt_ucode.h

@@ -394,27 +394,26 @@ fill_sg_comp_from_iov(sg_comp_t *list,
 	int32_t j;
 	uint32_t extra_len = extra_buf ? extra_buf->size : 0;
 	uint32_t size = *psize;
-	buf_ptr_t *bufs;
 
-	bufs = from->bufs;
 	for (j = 0; (j < from->buf_cnt) && size; j++) {
+		phys_addr_t dma_addr = from->bufs[j].dma_addr;
+		uint32_t buf_sz = from->bufs[j].size;
+		sg_comp_t *to = &list[i >> 2];
 		phys_addr_t e_dma_addr;
 		uint32_t e_len;
-		sg_comp_t *to = &list[i >> 2];
 
 		if (unlikely(from_offset)) {
-			if (from_offset >= bufs[j].size) {
-				from_offset -= bufs[j].size;
+			if (from_offset >= buf_sz) {
+				from_offset -= buf_sz;
 				continue;
 			}
-			e_dma_addr = bufs[j].dma_addr + from_offset;
-			e_len = (size > (bufs[j].size - from_offset)) ?
-				(bufs[j].size - from_offset) : size;
+			e_dma_addr = dma_addr + from_offset;
+			e_len = (size > (buf_sz - from_offset)) ?
+				(buf_sz - from_offset) : size;
 			from_offset = 0;
 		} else {
-			e_dma_addr = bufs[j].dma_addr;
-			e_len = (size > bufs[j].size) ?
-				bufs[j].size : size;
+			e_dma_addr = dma_addr;
+			e_len = (size > buf_sz) ? buf_sz : size;
 		}
 
 		to->u.s.len[i % 4] = rte_cpu_to_be_16(e_len);