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qemu-patch-raspberry4
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dp8393x: Update LLFA and CRDA registers from rx descriptor 

Follow the algorithm given in the National Semiconductor DP83932C
datasheet in section 3.4.7:

    At the next reception, the SONIC re-reads the last RXpkt.link field,
    and updates its CRDA register to point to the next descriptor.

The chip is designed to allow the host to provide a new list of
descriptors in this way.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Tested-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
(cherry picked from commit 5b0c98fcb7)
*drop context dep on 19f7034773
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
stable-4.2
Finn Thain 2020-01-29 20:27:49 +11:00 committed by Michael Roth
parent 153c3320e7
commit edd67a61f4
1 changed files with 7 additions and 4 deletions
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11
hw/net/dp8393x.c
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@ -784,12 +784,13 @@ static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf,
address = dp8393x_crda(s) + sizeof(uint16_t) * 5 * width;
address_space_rw(&s->as, address, MEMTXATTRS_UNSPECIFIED,
(uint8_t *)s->data, size, 0);
if (dp8393x_get(s, width, 0) & SONIC_DESC_EOL) {
s->regs[SONIC_LLFA] = dp8393x_get(s, width, 0);
if (s->regs[SONIC_LLFA] & SONIC_DESC_EOL) {
/* Still EOL ; stop reception */
return -1;
} else {
s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA];
}
/* Link has been updated by host */
s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA];
}
/* Save current position */
@ -837,7 +838,7 @@ static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf,
address_space_rw(&s->as, dp8393x_crda(s),
MEMTXATTRS_UNSPECIFIED, (uint8_t *)s->data, size, 1);
/* Move to next descriptor */
/* Check link field */
size = sizeof(uint16_t) * width;
address_space_rw(&s->as, dp8393x_crda(s) + sizeof(uint16_t) * 5 * width,
MEMTXATTRS_UNSPECIFIED, (uint8_t *)s->data, size, 0);
@ -852,6 +853,8 @@ static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf,
dp8393x_put(s, width, 0, 0);
address_space_rw(&s->as, address, MEMTXATTRS_UNSPECIFIED,
(uint8_t *)s->data, size, true);
/* Move to next descriptor */
s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA];
s->regs[SONIC_ISR] |= SONIC_ISR_PKTRX;
s->regs[SONIC_RSC] = (s->regs[SONIC_RSC] & 0xff00) | (((s->regs[SONIC_RSC] & 0x00ff) + 1) & 0x00ff);