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libcxgb4: Use memcpy instead of copying WRs 8B at a time in the userspace

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RDMA library for cxgbe(4).

MFC after:	3 days
Sponsored by:	Chelsio Communications
This commit is contained in:
Navdeep Parhar 2017-05-27 02:05:21 +00:00
parent 41cf0d54a2
commit 7de5a71e79
1 changed files with 32 additions and 22 deletions
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54
contrib/ofed/libcxgb4/src/qp.c
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@ -47,39 +47,49 @@ struct c4iw_stats c4iw_stats;
static void copy_wr_to_sq(struct t4_wq *wq, union t4_wr *wqe, u8 len16)
{
u64 *src, *dst;
void *src, *dst;
uintptr_t end;
int total, len;
src = (u64 *)wqe;
dst = (u64 *)((u8 *)wq->sq.queue + wq->sq.wq_pidx * T4_EQ_ENTRY_SIZE);
src = &wqe->flits[0];
dst = &wq->sq.queue->flits[wq->sq.wq_pidx *
(T4_EQ_ENTRY_SIZE / sizeof(__be64))];
if (t4_sq_onchip(wq)) {
len16 = align(len16, 4);
wc_wmb();
}
while (len16) {
*dst++ = *src++;
if (dst == (u64 *)&wq->sq.queue[wq->sq.size])
dst = (u64 *)wq->sq.queue;
*dst++ = *src++;
if (dst == (u64 *)&wq->sq.queue[wq->sq.size])
dst = (u64 *)wq->sq.queue;
len16--;
total = len16 * 16;
end = (uintptr_t)&wq->sq.queue[wq->sq.size];
if (__predict_true((uintptr_t)dst + total <= end)) {
/* Won't wrap around. */
memcpy(dst, src, total);
} else {
len = end - (uintptr_t)dst;
memcpy(dst, src, len);
memcpy(wq->sq.queue, src + len, total - len);
}
}
static void copy_wr_to_rq(struct t4_wq *wq, union t4_recv_wr *wqe, u8 len16)
{
u64 *src, *dst;
void *src, *dst;
uintptr_t end;
int total, len;
src = (u64 *)wqe;
dst = (u64 *)((u8 *)wq->rq.queue + wq->rq.wq_pidx * T4_EQ_ENTRY_SIZE);
while (len16) {
*dst++ = *src++;
if (dst >= (u64 *)&wq->rq.queue[wq->rq.size])
dst = (u64 *)wq->rq.queue;
*dst++ = *src++;
if (dst >= (u64 *)&wq->rq.queue[wq->rq.size])
dst = (u64 *)wq->rq.queue;
len16--;
src = &wqe->flits[0];
dst = &wq->rq.queue->flits[wq->rq.wq_pidx *
(T4_EQ_ENTRY_SIZE / sizeof(__be64))];
total = len16 * 16;
end = (uintptr_t)&wq->rq.queue[wq->rq.size];
if (__predict_true((uintptr_t)dst + total <= end)) {
/* Won't wrap around. */
memcpy(dst, src, total);
} else {
len = end - (uintptr_t)dst;
memcpy(dst, src, len);
memcpy(wq->rq.queue, src + len, total - len);
}
}