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esp.c: rework esp_cdb_length() into esp_cdb_ready()

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The esp_cdb_length() function is only used as part of a calculation to determine
whether the cmdfifo contains an entire SCSI CDB. Rework esp_cdb_length() into a
new esp_cdb_ready() function which both enables us to handle the case where
scsi_cdb_length() returns -1, plus simplify the logic for its callers.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20240324191707.623175-12-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2024-03-24 19:17:00 +00:00
parent 5a50644e47
commit 5aa0df4067
1 changed files with 14 additions and 16 deletions
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22
hw/scsi/esp.c
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@ -425,20 +425,20 @@ static void write_response(ESPState *s)
}
}
static int esp_cdb_length(ESPState *s)
static bool esp_cdb_ready(ESPState *s)
{
int len = fifo8_num_used(&s->cmdfifo) - s->cmdfifo_cdb_offset;
const uint8_t *pbuf;
int cmdlen, len;
int cdblen;
cmdlen = fifo8_num_used(&s->cmdfifo);
if (cmdlen < s->cmdfifo_cdb_offset) {
return 0;
if (len <= 0) {
return false;
}
pbuf = fifo8_peek_buf(&s->cmdfifo, cmdlen, NULL);
len = scsi_cdb_length((uint8_t *)&pbuf[s->cmdfifo_cdb_offset]);
pbuf = fifo8_peek_buf(&s->cmdfifo, len, NULL);
cdblen = scsi_cdb_length((uint8_t *)&pbuf[s->cmdfifo_cdb_offset]);
return len;
return cdblen < 0 ? false : (len >= cdblen);
}
static void esp_dma_ti_check(ESPState *s)
@ -806,8 +806,7 @@ static void esp_do_nodma(ESPState *s)
trace_esp_handle_ti_cmd(cmdlen);
/* CDB may be transferred in one or more TI commands */
if (esp_cdb_length(s) && esp_cdb_length(s) ==
fifo8_num_used(&s->cmdfifo) - s->cmdfifo_cdb_offset) {
if (esp_cdb_ready(s)) {
/* Command has been received */
do_cmd(s);
} else {
@ -832,8 +831,7 @@ static void esp_do_nodma(ESPState *s)
fifo8_push_all(&s->cmdfifo, buf, len);
/* Handle when DMA transfer is terminated by non-DMA FIFO write */
if (esp_cdb_length(s) && esp_cdb_length(s) ==
fifo8_num_used(&s->cmdfifo) - s->cmdfifo_cdb_offset) {
if (esp_cdb_ready(s)) {
/* Command has been received */
do_cmd(s);
}