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Handle jumbo frames without requiring big clusters in mlx5en(4).

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The scatter list is formed by the chunks of MCLBYTES each, and larger
than default packets are returned to the stack as the mbuf chain.

Submitted by:		kib@
MFC after:		1 week
Sponsored by:		Mellanox Technologies
This commit is contained in:
Hans Petter Selasky 2018-07-17 11:42:05 +00:00
parent 7bca8056ad
commit 2f17f76aa4
3 changed files with 150 additions and 29 deletions
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19
sys/dev/mlx5/mlx5_en/en.h
View File

@ -81,8 +81,19 @@
#define MLX5E_PARAMS_DEFAULT_LOG_RQ_SIZE 0xa
#define MLX5E_PARAMS_MAXIMUM_LOG_RQ_SIZE 0xe
/* freeBSD HW LRO is limited by 16KB - the size of max mbuf */
#define MLX5E_MAX_RX_SEGS 7
#ifndef MLX5E_MAX_RX_BYTES
#define MLX5E_MAX_RX_BYTES MCLBYTES
#endif
#if (MLX5E_MAX_RX_SEGS == 1)
/* FreeBSD HW LRO is limited by 16KB - the size of max mbuf */
#define MLX5E_PARAMS_DEFAULT_LRO_WQE_SZ MJUM16BYTES
#else
#define MLX5E_PARAMS_DEFAULT_LRO_WQE_SZ \
MIN(65535, MLX5E_MAX_RX_SEGS * MLX5E_MAX_RX_BYTES)
#endif
#define MLX5E_PARAMS_DEFAULT_RX_CQ_MODERATION_USEC 0x10
#define MLX5E_PARAMS_DEFAULT_RX_CQ_MODERATION_USEC_FROM_CQE 0x3
#define MLX5E_PARAMS_DEFAULT_RX_CQ_MODERATION_PKTS 0x20
@ -533,6 +544,7 @@ struct mlx5e_rq {
struct mtx mtx;
bus_dma_tag_t dma_tag;
u32 wqe_sz;
u32 nsegs;
struct mlx5e_rq_mbuf *mbuf;
struct ifnet *ifp;
struct mlx5e_rq_stats stats;
@ -806,9 +818,12 @@ struct mlx5e_tx_wqe {
struct mlx5e_rx_wqe {
struct mlx5_wqe_srq_next_seg next;
struct mlx5_wqe_data_seg data;
struct mlx5_wqe_data_seg data[];
};
/* the size of the structure above must be power of two */
CTASSERT(powerof2(sizeof(struct mlx5e_rx_wqe)));
struct mlx5e_eeprom {
int lock_bit;
int i2c_addr;

84
sys/dev/mlx5/mlx5_en/mlx5_en_main.c
View File

@ -33,9 +33,12 @@
#ifndef ETH_DRIVER_VERSION
#define ETH_DRIVER_VERSION "3.4.1"
#endif
char mlx5e_version[] = "Mellanox Ethernet driver"
" (" ETH_DRIVER_VERSION ")";
static int mlx5e_get_wqe_sz(struct mlx5e_priv *priv, u32 *wqe_sz, u32 *nsegs);
struct mlx5e_channel_param {
struct mlx5e_rq_param rq;
struct mlx5e_sq_param sq;
@ -810,6 +813,11 @@ mlx5e_create_rq(struct mlx5e_channel *c,
int wq_sz;
int err;
int i;
u32 nsegs, wqe_sz;
err = mlx5e_get_wqe_sz(priv, &wqe_sz, &nsegs);
if (err != 0)
goto done;
/* Create DMA descriptor TAG */
if ((err = -bus_dma_tag_create(
@ -819,9 +827,9 @@ mlx5e_create_rq(struct mlx5e_channel *c,
BUS_SPACE_MAXADDR, /* lowaddr */
BUS_SPACE_MAXADDR, /* highaddr */
NULL, NULL, /* filter, filterarg */
MJUM16BYTES, /* maxsize */
1, /* nsegments */
MJUM16BYTES, /* maxsegsize */
nsegs * MLX5E_MAX_RX_BYTES, /* maxsize */
nsegs, /* nsegments */
nsegs * MLX5E_MAX_RX_BYTES, /* maxsegsize */
0, /* flags */
NULL, NULL, /* lockfunc, lockfuncarg */
&rq->dma_tag)))
@ -834,23 +842,9 @@ mlx5e_create_rq(struct mlx5e_channel *c,
rq->wq.db = &rq->wq.db[MLX5_RCV_DBR];
if (priv->params.hw_lro_en) {
rq->wqe_sz = priv->params.lro_wqe_sz;
} else {
rq->wqe_sz = MLX5E_SW2MB_MTU(priv->ifp->if_mtu);
}
if (rq->wqe_sz > MJUM16BYTES) {
err = -ENOMEM;
err = mlx5e_get_wqe_sz(priv, &rq->wqe_sz, &rq->nsegs);
if (err != 0)
goto err_rq_wq_destroy;
} else if (rq->wqe_sz > MJUM9BYTES) {
rq->wqe_sz = MJUM16BYTES;
} else if (rq->wqe_sz > MJUMPAGESIZE) {
rq->wqe_sz = MJUM9BYTES;
} else if (rq->wqe_sz > MCLBYTES) {
rq->wqe_sz = MJUMPAGESIZE;
} else {
rq->wqe_sz = MCLBYTES;
}
wq_sz = mlx5_wq_ll_get_size(&rq->wq);
@ -861,7 +855,11 @@ mlx5e_create_rq(struct mlx5e_channel *c,
rq->mbuf = malloc(wq_sz * sizeof(rq->mbuf[0]), M_MLX5EN, M_WAITOK | M_ZERO);
for (i = 0; i != wq_sz; i++) {
struct mlx5e_rx_wqe *wqe = mlx5_wq_ll_get_wqe(&rq->wq, i);
#if (MLX5E_MAX_RX_SEGS == 1)
uint32_t byte_count = rq->wqe_sz - MLX5E_NET_IP_ALIGN;
#else
int j;
#endif
err = -bus_dmamap_create(rq->dma_tag, 0, &rq->mbuf[i].dma_map);
if (err != 0) {
@ -869,8 +867,15 @@ mlx5e_create_rq(struct mlx5e_channel *c,
bus_dmamap_destroy(rq->dma_tag, rq->mbuf[i].dma_map);
goto err_rq_mbuf_free;
}
wqe->data.lkey = c->mkey_be;
wqe->data.byte_count = cpu_to_be32(byte_count | MLX5_HW_START_PADDING);
/* set value for constant fields */
#if (MLX5E_MAX_RX_SEGS == 1)
wqe->data[0].lkey = c->mkey_be;
wqe->data[0].byte_count = cpu_to_be32(byte_count | MLX5_HW_START_PADDING);
#else
for (j = 0; j < rq->nsegs; j++)
wqe->data[j].lkey = c->mkey_be;
#endif
}
rq->ifp = c->ifp;
@ -1809,16 +1814,51 @@ mlx5e_close_channel_wait(struct mlx5e_channel *volatile *pp)
free(c, M_MLX5EN);
}
static int
mlx5e_get_wqe_sz(struct mlx5e_priv *priv, u32 *wqe_sz, u32 *nsegs)
{
u32 r, n;
r = priv->params.hw_lro_en ? priv->params.lro_wqe_sz :
MLX5E_SW2MB_MTU(priv->ifp->if_mtu);
if (r > MJUM16BYTES)
return (-ENOMEM);
if (r > MJUM9BYTES)
r = MJUM16BYTES;
else if (r > MJUMPAGESIZE)
r = MJUM9BYTES;
else if (r > MCLBYTES)
r = MJUMPAGESIZE;
else
r = MCLBYTES;
/*
* n + 1 must be a power of two, because stride size must be.
* Stride size is 16 * (n + 1), as the first segment is
* control.
*/
for (n = howmany(r, MLX5E_MAX_RX_BYTES); !powerof2(n + 1); n++)
;
*wqe_sz = r;
*nsegs = n;
return (0);
}
static void
mlx5e_build_rq_param(struct mlx5e_priv *priv,
struct mlx5e_rq_param *param)
{
void *rqc = param->rqc;
void *wq = MLX5_ADDR_OF(rqc, rqc, wq);
u32 wqe_sz, nsegs;
mlx5e_get_wqe_sz(priv, &wqe_sz, &nsegs);
MLX5_SET(wq, wq, wq_type, MLX5_WQ_TYPE_LINKED_LIST);
MLX5_SET(wq, wq, end_padding_mode, MLX5_WQ_END_PAD_MODE_ALIGN);
MLX5_SET(wq, wq, log_wq_stride, ilog2(sizeof(struct mlx5e_rx_wqe)));
MLX5_SET(wq, wq, log_wq_stride, ilog2(sizeof(struct mlx5e_rx_wqe) +
nsegs * sizeof(struct mlx5_wqe_data_seg)));
MLX5_SET(wq, wq, log_wq_sz, priv->params.log_rq_size);
MLX5_SET(wq, wq, pd, priv->pdn);

76
sys/dev/mlx5/mlx5_en/mlx5_en_rx.c
View File

@ -32,21 +32,47 @@ static inline int
mlx5e_alloc_rx_wqe(struct mlx5e_rq *rq,
struct mlx5e_rx_wqe *wqe, u16 ix)
{
bus_dma_segment_t segs[1];
bus_dma_segment_t segs[rq->nsegs];
struct mbuf *mb;
int nsegs;
int err;
#if (MLX5E_MAX_RX_SEGS != 1)
struct mbuf *mb_head;
int i;
#endif
if (rq->mbuf[ix].mbuf != NULL)
return (0);
#if (MLX5E_MAX_RX_SEGS == 1)
mb = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, rq->wqe_sz);
if (unlikely(!mb))
return (-ENOMEM);
/* set initial mbuf length */
mb->m_pkthdr.len = mb->m_len = rq->wqe_sz;
#else
mb_head = mb = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR,
MLX5E_MAX_RX_BYTES);
if (unlikely(mb == NULL))
return (-ENOMEM);
mb->m_len = MLX5E_MAX_RX_BYTES;
mb->m_pkthdr.len = MLX5E_MAX_RX_BYTES;
for (i = 1; i < rq->nsegs; i++) {
if (mb_head->m_pkthdr.len >= rq->wqe_sz)
break;
mb = mb->m_next = m_getjcl(M_NOWAIT, MT_DATA, 0,
MLX5E_MAX_RX_BYTES);
if (unlikely(mb == NULL)) {
m_freem(mb_head);
return (-ENOMEM);
}
mb->m_len = MLX5E_MAX_RX_BYTES;
mb_head->m_pkthdr.len += MLX5E_MAX_RX_BYTES;
}
/* rewind to first mbuf in chain */
mb = mb_head;
#endif
/* get IP header aligned */
m_adj(mb, MLX5E_NET_IP_ALIGN);
@ -54,12 +80,26 @@ mlx5e_alloc_rx_wqe(struct mlx5e_rq *rq,
mb, segs, &nsegs, BUS_DMA_NOWAIT);
if (err != 0)
goto err_free_mbuf;
if (unlikely(nsegs != 1)) {
if (unlikely(nsegs == 0)) {
bus_dmamap_unload(rq->dma_tag, rq->mbuf[ix].dma_map);
err = -ENOMEM;
goto err_free_mbuf;
}
wqe->data.addr = cpu_to_be64(segs[0].ds_addr);
#if (MLX5E_MAX_RX_SEGS == 1)
wqe->data[0].addr = cpu_to_be64(segs[0].ds_addr);
#else
wqe->data[0].addr = cpu_to_be64(segs[0].ds_addr);
wqe->data[0].byte_count = cpu_to_be32(segs[0].ds_len |
MLX5_HW_START_PADDING);
for (i = 1; i != nsegs; i++) {
wqe->data[i].addr = cpu_to_be64(segs[i].ds_addr);
wqe->data[i].byte_count = cpu_to_be32(segs[i].ds_len);
}
for (; i < rq->nsegs; i++) {
wqe->data[i].addr = 0;
wqe->data[i].byte_count = 0;
}
#endif
rq->mbuf[ix].mbuf = mb;
rq->mbuf[ix].data = mb->m_data;
@ -214,6 +254,9 @@ mlx5e_build_rx_mbuf(struct mlx5_cqe64 *cqe,
{
struct ifnet *ifp = rq->ifp;
struct mlx5e_channel *c;
#if (MLX5E_MAX_RX_SEGS != 1)
struct mbuf *mb_head;
#endif
int lro_num_seg; /* HW LRO session aggregated packets counter */
uint64_t tstmp;
@ -224,7 +267,26 @@ mlx5e_build_rx_mbuf(struct mlx5_cqe64 *cqe,
rq->stats.lro_bytes += cqe_bcnt;
}
#if (MLX5E_MAX_RX_SEGS == 1)
mb->m_pkthdr.len = mb->m_len = cqe_bcnt;
#else
mb->m_pkthdr.len = cqe_bcnt;
for (mb_head = mb; mb != NULL; mb = mb->m_next) {
if (mb->m_len > cqe_bcnt)
mb->m_len = cqe_bcnt;
cqe_bcnt -= mb->m_len;
if (likely(cqe_bcnt == 0)) {
if (likely(mb->m_next != NULL)) {
/* trim off empty mbufs */
m_freem(mb->m_next);
mb->m_next = NULL;
}
break;
}
}
/* rewind to first mbuf in chain */
mb = mb_head;
#endif
/* check if a Toeplitz hash was computed */
if (cqe->rss_hash_type != 0) {
mb->m_pkthdr.flowid = be32_to_cpu(cqe->rss_hash_result);
@ -402,6 +464,10 @@ mlx5e_poll_rx_cq(struct mlx5e_rq *rq, int budget)
}
if ((MHLEN - MLX5E_NET_IP_ALIGN) >= byte_cnt &&
(mb = m_gethdr(M_NOWAIT, MT_DATA)) != NULL) {
#if (MLX5E_MAX_RX_SEGS != 1)
/* set maximum mbuf length */
mb->m_len = MHLEN - MLX5E_NET_IP_ALIGN;
#endif
/* get IP header aligned */
mb->m_data += MLX5E_NET_IP_ALIGN;