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net: cadence_gem: Add support for jumbo frames 

Add a property "jumbo-max-len", which sets default value of jumbo frames
up to 16,383 bytes. Add Frame length checks for standard and jumbo
frames.

Signed-off-by: Sai Pavan Boddu <sai.pavan.boddu@xilinx.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Sai Pavan Boddu 2020-05-12 20:24:50 +05:30 committed by Jason Wang
parent 88dba7ed84
commit 7ca151c381
2 changed files with 49 additions and 6 deletions
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51
hw/net/cadence_gem.c
View File

@ -61,6 +61,7 @@
#define GEM_TXPAUSE (0x0000003C / 4) /* TX Pause Time reg */
#define GEM_TXPARTIALSF (0x00000040 / 4) /* TX Partial Store and Forward */
#define GEM_RXPARTIALSF (0x00000044 / 4) /* RX Partial Store and Forward */
#define GEM_JUMBO_MAX_LEN (0x00000048 / 4) /* Max Jumbo Frame Size */
#define GEM_HASHLO (0x00000080 / 4) /* Hash Low address reg */
#define GEM_HASHHI (0x00000084 / 4) /* Hash High address reg */
#define GEM_SPADDR1LO (0x00000088 / 4) /* Specific addr 1 low reg */
@ -212,10 +213,12 @@
#define GEM_NWCFG_LERR_DISC 0x00010000 /* Discard RX frames with len err */
#define GEM_NWCFG_BUFF_OFST_M 0x0000C000 /* Receive buffer offset mask */
#define GEM_NWCFG_BUFF_OFST_S 14 /* Receive buffer offset shift */
#define GEM_NWCFG_RCV_1538 0x00000100 /* Receive 1538 bytes frame */
#define GEM_NWCFG_UCAST_HASH 0x00000080 /* accept unicast if hash match */
#define GEM_NWCFG_MCAST_HASH 0x00000040 /* accept multicast if hash match */
#define GEM_NWCFG_BCAST_REJ 0x00000020 /* Reject broadcast packets */
#define GEM_NWCFG_PROMISC 0x00000010 /* Accept all packets */
#define GEM_NWCFG_JUMBO_FRAME 0x00000008 /* Jumbo Frames enable */
#define GEM_DMACFG_ADDR_64B (1U << 30)
#define GEM_DMACFG_TX_BD_EXT (1U << 29)
@ -233,6 +236,7 @@
/* GEM_ISR GEM_IER GEM_IDR GEM_IMR */
#define GEM_INT_TXCMPL 0x00000080 /* Transmit Complete */
#define GEM_INT_AMBA_ERR 0x00000040
#define GEM_INT_TXUSED 0x00000008
#define GEM_INT_RXUSED 0x00000004
#define GEM_INT_RXCMPL 0x00000002
@ -453,6 +457,24 @@ static inline void rx_desc_set_sar(uint32_t *desc, int sar_idx)
/* The broadcast MAC address: 0xFFFFFFFFFFFF */
static const uint8_t broadcast_addr[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
static uint32_t gem_get_max_buf_len(CadenceGEMState *s, bool tx)
{
uint32_t size;
if (s->regs[GEM_NWCFG] & GEM_NWCFG_JUMBO_FRAME) {
size = s->regs[GEM_JUMBO_MAX_LEN];
if (size > s->jumbo_max_len) {
size = s->jumbo_max_len;
qemu_log_mask(LOG_GUEST_ERROR, "GEM_JUMBO_MAX_LEN reg cannot be"
" greater than 0x%" PRIx32 "\n", s->jumbo_max_len);
}
} else if (tx) {
size = 1518;
} else {
size = s->regs[GEM_NWCFG] & GEM_NWCFG_RCV_1538 ? 1538 : 1518;
}
return size;
}
static void gem_set_isr(CadenceGEMState *s, int q, uint32_t flag)
{
if (q == 0) {
@ -1016,6 +1038,12 @@ static ssize_t gem_receive(NetClientState *nc, const uint8_t *buf, size_t size)
/* Find which queue we are targeting */
q = get_queue_from_screen(s, rxbuf_ptr, rxbufsize);
if (size > gem_get_max_buf_len(s, false)) {
qemu_log_mask(LOG_GUEST_ERROR, "rx frame too long\n");
gem_set_isr(s, q, GEM_INT_AMBA_ERR);
return -1;
}
while (bytes_to_copy) {
hwaddr desc_addr;
@ -1196,12 +1224,13 @@ static void gem_transmit(CadenceGEMState *s)
break;
}
if (tx_desc_get_length(desc) > MAX_FRAME_SIZE -
if (tx_desc_get_length(desc) > gem_get_max_buf_len(s, true) -
(p - s->tx_packet)) {
DB_PRINT("TX descriptor @ 0x%" HWADDR_PRIx \
" too large: size 0x%x space 0x%zx\n",
qemu_log_mask(LOG_GUEST_ERROR, "TX descriptor @ 0x%" \
HWADDR_PRIx " too large: size 0x%x space 0x%zx\n",
packet_desc_addr, tx_desc_get_length(desc),
MAX_FRAME_SIZE - (p - s->tx_packet));
gem_get_max_buf_len(s, true) - (p - s->tx_packet));
gem_set_isr(s, q, GEM_INT_AMBA_ERR);
break;
}
@ -1343,9 +1372,10 @@ static void gem_reset(DeviceState *d)
s->regs[GEM_RXPARTIALSF] = 0x000003ff;
s->regs[GEM_MODID] = s->revision;
s->regs[GEM_DESCONF] = 0x02500111;
s->regs[GEM_DESCONF2] = 0x2ab13fff;
s->regs[GEM_DESCONF2] = 0x2ab10000 | s->jumbo_max_len;
s->regs[GEM_DESCONF5] = 0x002f2045;
s->regs[GEM_DESCONF6] = GEM_DESCONF6_64B_MASK;
s->regs[GEM_JUMBO_MAX_LEN] = s->jumbo_max_len;
if (s->num_priority_queues > 1) {
queues_mask = MAKE_64BIT_MASK(1, s->num_priority_queues - 1);
@ -1516,6 +1546,9 @@ static void gem_write(void *opaque, hwaddr offset, uint64_t val,
s->regs[GEM_IMR] &= ~val;
gem_update_int_status(s);
break;
case GEM_JUMBO_MAX_LEN:
s->regs[GEM_JUMBO_MAX_LEN] = val & MAX_JUMBO_FRAME_SIZE_MASK;
break;
case GEM_INT_Q1_ENABLE ... GEM_INT_Q7_ENABLE:
s->regs[GEM_INT_Q1_MASK + offset - GEM_INT_Q1_ENABLE] &= ~val;
gem_update_int_status(s);
@ -1610,6 +1643,12 @@ static void gem_realize(DeviceState *dev, Error **errp)
s->nic = qemu_new_nic(&net_gem_info, &s->conf,
object_get_typename(OBJECT(dev)), dev->id, s);
if (s->jumbo_max_len > MAX_FRAME_SIZE) {
error_setg(errp, "jumbo-max-len is greater than %d",
MAX_FRAME_SIZE);
return;
}
}
static void gem_init(Object *obj)
@ -1658,6 +1697,8 @@ static Property gem_properties[] = {
num_type1_screeners, 4),
DEFINE_PROP_UINT8("num-type2-screeners", CadenceGEMState,
num_type2_screeners, 4),
DEFINE_PROP_UINT16("jumbo-max-len", CadenceGEMState,
jumbo_max_len, 10240),
DEFINE_PROP_END_OF_LIST(),
};

4
include/hw/net/cadence_gem.h
View File

@ -40,7 +40,8 @@
#define MAX_TYPE1_SCREENERS 16
#define MAX_TYPE2_SCREENERS 16
#define MAX_FRAME_SIZE 2048
#define MAX_JUMBO_FRAME_SIZE_MASK 0x3FFF
#define MAX_FRAME_SIZE MAX_JUMBO_FRAME_SIZE_MASK
typedef struct CadenceGEMState {
/*< private >*/
@ -59,6 +60,7 @@ typedef struct CadenceGEMState {
uint8_t num_type1_screeners;
uint8_t num_type2_screeners;
uint32_t revision;
uint16_t jumbo_max_len;
/* GEM registers backing store */
uint32_t regs[CADENCE_GEM_MAXREG];