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iscsi: compute Data Digest for out_data segments

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This commit is contained in:
lishiao
2025-06-17 11:57:38 +08:00
parent cbba36e150
commit a81eacc0b1
2 changed files with 22 additions and 4 deletions
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2
include/iscsi-private.h
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@@ -20,6 +20,7 @@
#include <stdint.h>
#include <time.h>
#include <unistd.h>
#include <stdbool.h>
#if defined(_WIN32)
#include <basetsd.h>
@@ -316,6 +317,7 @@ struct iscsi_pdu {
uint32_t expxferlen;
uint32_t calculated_data_digest;
bool outdata_digest_computed;
};
struct iscsi_pdu *iscsi_allocate_pdu(struct iscsi_context *iscsi,

24
lib/socket.c
View File

@@ -839,13 +839,12 @@ static int iscsi_pdu_update_headerdigest(struct iscsi_context *iscsi, struct isc
static int
iscsi_write_to_socket(struct iscsi_context *iscsi)
{
ssize_t count;
ssize_t count, data_segment_len;
size_t total;
struct iscsi_pdu *pdu;
static char padding_buf[3];
int socket_flags = 0;
bool do_data_digest = (iscsi->data_digest != ISCSI_DATA_DIGEST_NONE);
bool do_data_digest = (iscsi->data_digest != ISCSI_DATA_DIGEST_NONE), execute_data_digest;
#ifdef MSG_NOSIGNAL
socket_flags |= MSG_NOSIGNAL;
#elif SO_NOSIGPIPE
@@ -935,6 +934,23 @@ iscsi_write_to_socket(struct iscsi_context *iscsi)
return 0;
}
data_segment_len = iscsi_get_pdu_data_size(pdu->outdata.data);
if (do_data_digest &&
data_segment_len &&
!pdu->payload_len)
execute_data_digest = true;
else
execute_data_digest = false;
if (execute_data_digest && !pdu->outdata_digest_computed)
{
uint8_t ahslen = pdu->outdata.data[4];
uint8_t head_len = iscsi->header_digest != ISCSI_HEADER_DIGEST_NONE ? 52 : 48;
uint32_t offset = head_len + ahslen * 4;
pdu->calculated_data_digest = crc32c_chain(pdu->calculated_data_digest, pdu->outdata.data + offset, pdu->outdata.size - offset);
pdu->outdata_digest_computed = true;
}
/* Write any iovectors that might have been passed to us */
while (pdu->payload_written < pdu->payload_len) {
struct scsi_iovector* iovector_out;
@@ -991,7 +1007,7 @@ iscsi_write_to_socket(struct iscsi_context *iscsi)
* 1. DataDigest has been negociated, and
* 2. We have actually written some data
*/
if (do_data_digest && pdu->payload_written) {
if (execute_data_digest || (do_data_digest && pdu->payload_written)) {
uint32_t data_digest = crc32c_chain_done(pdu->calculated_data_digest);
char data_digest_buf[ISCSI_DIGEST_SIZE];